JP3091661B2 - Garbage loading control device of garbage truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse loading control device for a refuse collection vehicle.

[0002]

2. Description of the Related Art Generally, a refuse collection vehicle is provided with a refuse storage box having a refuse loading port on a rear wall on a body frame of the refuse collection vehicle. The dust loading box is provided with a dust loading device that loads dust into the dust storage box through the dust loading port through the dust loading slot, inside the dust loading box. . Loading of dust by the dust loading device is performed using a hydraulically driven actuator as a drive source, and the actuator is driven and controlled by a dust loading control device.

[0003] The above-mentioned refuse loading control device is provided with an oil passage connected to an actuator so as to be able to supply pressure oil from a hydraulic pressure source to a communication position for connecting the oil passage and a cutoff for cutting off the communication between the oil passages. And an electromagnetic switching valve for switching the position of the electromagnetic switching valve with pressure oil supplied and discharged through an oil passage separate from the pressure oil to the actuator. Further, a position detector for detecting the position of the actuator is provided at an operation stop position for stopping the operation of the actuator, and a command signal for switching the electromagnetic switching valve to the communication position is output to the electromagnetic switching valve. The actuator is operated by supplying pressure oil from a hydraulic pressure source to the actuator, and outputs a command signal for switching the electromagnetic switching valve to a shut-off position when the actuator comes to an operation stop position. An operation control device is provided for controlling so as to stop the supply of the pressure oil to stop the driving of the actuator. Also, for example, a hydraulic cylinder or the like may be used as the actuator, and when such a hydraulic cylinder is used, the expansion / contraction operation stop position (operation stop position) of the hydraulic cylinder is determined by the expansion / contraction performance (operation In order to make effective use of (performance), it is usually set immediately before the expansion / contraction limit position.

[0004]

However, in the above-mentioned conventional refuse loading control device of a refuse collection vehicle, a command from an operation control device which is output to an electromagnetic switching valve after receiving a detection signal from a position detector. Since the electromagnetic switching valve is configured to be switched by pressure oil in response to a signal, when the garbage truck is used in a cold region or winter season, the oil temperature is low, so the viscosity of the pressure oil increases, The switching of the solenoid-operated directional control valve is not performed smoothly, so that excessive time is spent. Therefore, when a hydraulic cylinder is used as the actuator, even when the hydraulic cylinder passes the telescopic operation stop position, the electromagnetic switching valve does not switch and the bottom of the telescopic operation exceeds the telescopic operation limit position, causing abnormal noise with impact. There was a problem that occurred.

Therefore, in consideration of the oil temperature which becomes low in a cold region or winter season, a command signal is output to the electromagnetic switching valve at least before the required switching time of the electromagnetic switching valve at low oil temperature. By providing the position detector before the operation stop position, a command signal from the operation control device is output to the electromagnetic switching valve before the time required for the switching, and the actuator is stopped at the operation stop position. It is conceivable to surely prevent the generation of abnormal noise accompanying the impact at the time of bottom strike.

However, when the garbage truck is used in a warm place or in the summer, the oil temperature is high and the viscosity of the pressure oil is low.
As soon as the command signal from the operation control device is received, the electromagnetic switching valve is switched, and the actuator is stopped immediately before the operation stop position, so that the operation of the dust loading device is obstructed. Failure to reach the height approaching the entrance will result in a gap such as a height difference between the two, or an insufficient loading pressure on the garbage storage box.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to output a command signal to an electromagnetic switching valve in consideration of the time required for switching the electromagnetic switching valve depending on the oil temperature. By changing the timing, the actuator is reliably stopped at the operation stop position irrespective of the oil temperature difference, thereby preventing both the generation of abnormal noise accompanying the impact when the hydraulic cylinder hits the bottom and the operation failure of the dust loading device. It is in.

[0008]

Means for Solving the Problems To achieve the above object, a solution taken by the invention according to claim 1 is a refuse storage box having a refuse loading port on a rear wall on a body frame of a refuse collection vehicle. A dust input box is tiltably connected to the dust loading port of the dust storage box, and the dust loaded into the bottom from the input port of the dust input box is disposed inside the dust input box. A dust loading device for loading the dust storage box through the entrance is provided, and loading of the dust by the dust loading device is performed using a hydraulically driven actuator as a drive source, and An electromagnetic switching valve that switches between a communication position for communicating the oil passage and a shut-off position for interrupting the communication of the oil passage is provided in an oil passage that is connected to be able to supply pressure oil from a hydraulic pressure source. Electromagnetic switching valve to the above actuator The switching is performed by pressure oil supplied / discharged via an oil passage separate from the pressure oil, and a command signal for switching the electromagnetic switching valve to the communication position is output to the electromagnetic switching valve, whereby a hydraulic power source is supplied to the actuator. The hydraulic oil is supplied to the actuator while the actuator is operated, and when the actuator comes to the operation stop position, the command signal for switching the electromagnetic switching valve to the shut-off position is output to supply the hydraulic oil to the actuator. It is assumed that a dust loading control device of a dust collection vehicle provided with an operation control device that controls to shut off and stop driving the actuator.
A position detector for detecting the position of the actuator at a position before the operation stop position of the actuator is provided, and an oil temperature detector for detecting the oil temperature of the hydraulic source is provided for the hydraulic source. . Further, the detection signal from the position detector and the oil temperature detector is input to the operation control device, and the output timing of the command signal from the operation control device for switching the electromagnetic switching valve to the shut-off position is set to the timing of the actuator. Output timing changing means is provided for changing based on the required switching time of the electromagnetic switching valve depending on the oil temperature at the time when the position of the actuator is detected at a position before the operation stop position.

The solution taken by the invention according to claim 2 is as follows.
A garbage storage box having a garbage loading port on the rear wall is mounted on a body frame of the garbage collection vehicle, and a garbage loading box is connected to the garbage loading port of the garbage storage box so as to be tiltable. Inside, is equipped with a dust loading device equipped with a plate for loading the dust into the dust storage box through the dust loading port through the dust loading slot into the bottom of the dust loading box. The loading of garbage is performed by a plate that operates using a hydraulically driven actuator as a drive source, and the oil passage is connected to the actuator so that pressure oil from a hydraulic source can be supplied to the actuator. An electromagnetic switching valve is provided for switching between a communication position for communicating the fluid and a shutoff position for interrupting the communication of the oil passage. The electromagnetic switching valve is supplied and discharged through an oil passage separate from the pressure oil to the actuator. Switching by pressure oil By outputting a command signal for switching the electromagnetic switching valve to the communication position to the electromagnetic switching valve, the actuator is supplied with pressure oil from a hydraulic source to operate the plate, while the plate operates. An operation control device is provided for controlling so as to shut off the supply of pressure oil to the actuator and stop the operation of the plate by outputting a command signal for switching the electromagnetic switching valve to the shut-off position when the stop position is reached. It is assumed that the garbage loading control device of the collected garbage truck. A position detector that detects the position of the plate at a position before the plate is stopped before the operation stop position of the plate, and an oil temperature detector that detects the oil temperature of the hydraulic source is provided at the hydraulic source. .
Further, the detection signal from the position detector and the oil temperature detector is input to the operation control device, and the output timing of the command signal from the operation control device for switching the electromagnetic switching valve to the shut-off position is set to the plate timing. Output timing changing means is provided for changing based on the required switching time of the electromagnetic switching valve depending on the oil temperature when the position of the plate is detected at a position before the operation stop position.

[0010]

According to the above-mentioned structure, according to the first aspect of the present invention,
The output timing of the command signal from the operation control device that switches the electromagnetic switching valve to the shut-off position is determined by an output timing changing unit that receives the detection signal from the position detector that detects the position of the actuator at a position before the operation stop position. The switching time of the electromagnetic switching valve is changed based on the time required for switching the electromagnetic switching valve depending on the oil temperature. When the oil temperature becomes long, the actuator outputs a command signal to the electromagnetic switching valve at an early timing immediately after the position detection of the actuator in consideration of the switching time of the electromagnetic switching valve at the low oil temperature. While operating in the section between the detection position and the operation stop position, the solenoid-operated directional control valve is switched slowly, and the actuator is reliably stopped at the operation stop position. . Therefore, when the actuator is, for example, a hydraulic cylinder or the like, it is reliably prevented from exceeding the expansion / contraction operation limit position, the bottom of the hydraulic cylinder is prevented, and the generation of abnormal noise accompanying the impact of the bottom is prevented. You.

On the other hand, when the oil temperature is high and the time required for switching the solenoid-operated directional control valve is short due to low-viscosity oil in a warm climate or summer season, the output is delayed at a later timing after a while from the position detection of the actuator. By outputting the command signal from the timing changing means to the electromagnetic switching valve, the electromagnetic switching valve is able to receive the command signal even when the actuator is sufficiently pulled to just before the operation stop position shortly after passing the detection position. As soon as the actuator is actuated, the operation is switched to the operation stop position, and then the operation is reliably stopped. Therefore, the actuator does not stop immediately before the operation stop position when the oil temperature is high, unlike the case where the operation control device outputs the command signal regardless of the oil temperature difference. An operation failure of the dust loading device such as a gap due to a height difference between the two without reaching the height facing the mouth and an insufficient loading pressure on the dust storage box is prevented.

According to the second aspect of the present invention, the output timing of the command signal from the operation control device for switching the electromagnetic switching valve to the shut-off position is determined by the position detector for detecting the position of the plate at a position before the operation stop position. The output timing changing means, which has quickly input the detection signal, is changed based on the required switching time of the solenoid-operated directional control valve depending on the oil temperature. Considering the switching time of the electromagnetic switching valve which becomes longer at the low oil temperature, the command signal is output to the electromagnetic switching valve at an early timing immediately after the detection of the position of the plate, so that the plate can be switched between the detection position and the operation stop position. During operation in the interval between the two, the electromagnetic switching valve is slowly switched to stop the operation by the actuator, and the plate is reliably stopped at the operation stop position. On the other hand, at the time of high oil temperature when the viscosity of the pressure oil becomes low, a command signal is output from the output timing changing means to the electromagnetic switching valve at a later timing after a while from the time of detecting the position of the plate, so that the electromagnetic switching valve Is switched as soon as it receives the command signal that is output when it passes through the detection position and reaches just before the operation stop position, and after the plate is operated to the operation stop position, the actuator stops operating and the plate stops. Stops at the operation stop position. Thereby, the plate of the dust loading device actually operated by the actuator is accurately controlled, and the operation of the dust loading device can be stopped more accurately.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a refuse collection vehicle provided with a refuse loading control device according to a first embodiment of the present invention.
A chassis frame 2 (only one is shown in the figure) having a substantially rectangular cross section as a body frame extending in the front-rear direction is provided at both lower left and right positions. A frame 3 is provided. A garbage storage box 4 having an open garbage loading port 4a for loading garbage on the rear side of the vehicle body on the sub-frame 3.
A dust input box 6 is connected to the upper end of the dust loading port 4a by a pivot 5 so as to be tiltable. The dust input box 6 is secured to the dust storage box 4 by a pair of left and right securing devices (not shown) so as to close the dust loading port 4a.

The dust input box 6 is open at the front of the vehicle body and communicates with the dust loading port 4a of the dust storage box 4, and has an input port 11 for inputting dust at the lower rear portion thereof, and a lower portion thereof. A dust storage chamber 12 is formed, and a compression type dust loading device 13 that compresses, crushes, and loads the dust into the dust storage box 4 is provided in the dust input box 6. The garbage loading device 13 includes a guide groove member 14 made of a channel steel which is laid along both side walls of the garbage input box 6 and is inclined toward a lower rear portion of the vehicle body. The pivot 5 is pivotally supported at the upper end. On the other hand, an elevating plate 15 (plate) formed over the entire width thereof is accommodated in the garbage charging box 6, and the elevating plate 15 is rolled up and down along the inner wall of the guide groove member 14. Guide rollers 16, 16 that are movably fitted are axially mounted (parts indicated by broken lines in the figure). A pivot 17 is pivotally supported on the upper portion of the rear surface of the elevating plate 15 via a bracket 15a. The pivot 17 extends along the back surface of the guide groove member 14 and matches the sliding distance of the elevating plate 15. The dust input box 6 projects beyond the notch 18 formed on the side wall of the dust input box 6 to the outside from the inside of the dust input box 6. As shown by a broken line in the figure, a pair of elevating cylinders 19 as actuators are provided along the inclined direction of the guide groove member 14 between the pivot 17 protruding outward and the lower outer side of the dust bin 6. The elevating plate 15 is reciprocated along the guide groove member 14 by the expansion and contraction operation of the elevating cylinder 19.

At the lower end of the elevating plate 15, a push plate 21 extending over the entire width of the dust bin 6 is pivotally supported back and forth. A pair of pushing cylinders 23 as an actuator is connected between the supporting piece 22 protruding from the back surface and the pivot 17 at the tip of the lifting cylinder 19.
By the expansion and contraction operation of 3, the push plate 21 is caused to swing back and forth around its pivot 24. As a result, the storage chamber 12 (bottom) from the input port 11 of the garbage input box 6
The dust put into the storage box 12 is raked up by swinging from the back to the front of the push plate 21 shown by the phantom line (dashed line) in FIG. 2 and then moves up and down the push plate 21 along the front wall in the storage chamber 12. By moving it upward through the plate 15, the dust storage box 4 (the dust storage space 27a to be described later)
Inside).

The refuse storage box 4 is provided with a refuse storage space for storing refuse packed from the refuse loading apparatus 13 through the refuse loading port 4a by a discharge plate 26 provided over the entire cross section. The space 27a is divided into a space 27a and a space 27b in front of the space 27a.
A discharge cylinder (not shown) for moving the cylinder in the axle direction is provided. The discharge cylinder, when extended, brings the discharge plate 26 close to the dust loading port 4a of the dust storage box 4 to minimize the volume of the dust storage space 27a, while increasing and changing the volume of the dust storage space 27a when contracted. It has been made like that.

Here, the hydraulic circuit of the lifting cylinder 19 and the pushing cylinder 23 will be described with reference to FIG.

In FIG. 1, reference numeral 31 denotes a hydraulic pump, and a tank 33 is connected to a suction side of the hydraulic pump via a first oil passage 32a. The tank 33 constitutes a hydraulic pressure source. On the other hand, the second oil passage 3
One end of the second oil passage 32b is connected to the other end of the second oil passage 32b, and a first electromagnetic switching valve 34 of a 4-port 3-position switching type is connected to the other end of the second oil passage 32b. The other end of the second oil passage 32b is connected to the other end of the third oil passage 32c, which is connected to the rod-side chamber of each elevating cylinder 19, so that the other end can communicate with the other end through the first electromagnetic switching valve 34. At the same time, one end is connected to the other end of the fourth oil passage 32 d connected to the head-side chamber of each lifting cylinder 19 so as to be able to communicate through the first electromagnetic switching valve 34. The other end of the second oil passage 32b has
The other end of the fifth oil passage 32e, one end of which is connected to the second electromagnetic switching valve 35 of the 4-port 3-position switching type, is connected so as to be able to communicate through the first electromagnetic switching valve 34. The fifth
One end of the oil passage 32e is connected to the other end of the sixth oil passage 32f connected to the rod-side chamber of each pushing cylinder 23 so that the oil passage 32e can communicate with the other end through the second electromagnetic switching valve 35. The other end of the seventh oil passage 32g connected to the head-side chamber of each pushing cylinder 23 is connected so as to be able to communicate through the second electromagnetic switching valve 35. In addition, one end of the fifth oil passage 32e is connected to the other end of the eighth oil passage 32h whose one end is opened to the tank 33 so as to be able to communicate with the other through the first electromagnetic switching valve 34.

The first solenoid-operated switching valve 34 (the construction of the second solenoid-operated switching valve is denoted by the same reference numeral and the description thereof is omitted since it has the same construction) is provided with an operation control device 42 described later.
And a rod-side chamber communication enabling supply of pressure oil to the head-side chamber of each lifting cylinder 19 (right position in the figure) and a rod-side chamber capable of supplying pressure oil to the rod-side chamber. The position is switched between a position (left position in the figure) and a shut-off position (center position in the figure) where the supply of the pressure oil is impossible. The first electromagnetic switching valve 34 includes:
The pressure oil is constantly urged to the shut-off position by the spring force from the switching axis direction, and is supplied via a first separate oil passage 36a (37a) different from the pressure oil to each of the lift cylinders 19. The position is switched to the head-side chamber communication position or the rod-side chamber communication position. The first separate oil passage 36
a and 37a are opposed to each other in the switching axis direction of the first electromagnetic switching valve 34. The first separate oil passage 36a (37
The other end of a) is connected to first and second electromagnetic switching valve mechanisms 38 and 39 of a three-port two-position switching type. The other end of the first separate oil passage 36a (37a) is connected to a second separate oil passage 36 for introducing a pilot pressure (oil pressure source) from one end.
b (37b) is connected to the other end through a first electromagnetic switching valve mechanism 38 (second electromagnetic switching valve mechanism 39) and is connected to the tank 33 at one end.
The first electromagnetic switching valve mechanism 3 is connected to the other end of the separate oil passage 36c (37c).
8 so that communication is possible. In the first electromagnetic switching valve mechanism 38 of the first electromagnetic switching valve 34, the first electromagnetic switching valve mechanism 38 is moved from a pressure oil discharge position (a lower position in the figure) to a pressure oil supply position against the urging force of a spring. (In the figure, the upper position) the first solenoid SOL1
The second electromagnetic switching valve mechanism 39 of the first electromagnetic switching valve 34
A second solenoid SO that switches the second electromagnetic switching valve mechanism 39 from a pressure oil discharge position (lower position in the drawing) to a pressure oil supply position (upper position in the drawing) against the urging force of a spring.
L2 are provided. On the other hand, the first electromagnetic switching valve mechanism 38 of the second electromagnetic switching valve 35 has a third electromagnetic switching valve mechanism 38 for switching the first electromagnetic switching valve mechanism 38 from the pressure oil discharge position to the pressure oil supply position against the urging force of the spring. Solenoid SOL3
The second electromagnetic switching valve mechanism 39 of the second electromagnetic switching valve 35
In the fourth mode, the second electromagnetic switching valve mechanism 39 is switched from the pressure oil discharge position to the pressure oil supply position against the urging force of the spring.
Each of the solenoids SOL4 is provided. The first electromagnetic switching valve 34 includes a first electromagnetic switching valve mechanism 38 having the first solenoid SOL1 and a second solenoid SO.
While the second electromagnetic switching valve mechanism 39 having L2 is integrally provided, the second electromagnetic switching valve 35 includes a first electromagnetic switching valve mechanism 38 having the third solenoid SOL3 and a fourth solenoid. The second electromagnetic switching valve mechanism 39 having the SOL 4 is integrally provided. Further, a first electromagnetic switching valve mechanism 3 is provided in the first separate oil passage 36a.
An orifice 40 is provided for slowing the discharge of the pressure oil in the first separate oil passage 36a when 8 is switched to the pressure oil discharge position, thereby preventing the first electromagnetic switching valve 34 from being rapidly switched.
On the other hand, the first separate oil passage 37a when the second electromagnetic switching valve mechanism 39 is switched to the pressure oil discharge position is also provided in the second separate oil passage 37a.
An orifice 40 is provided for slowing the discharge of the internal pressure oil to prevent abrupt switching of the first electromagnetic switching valve 34. The tank 33 is provided with an oil temperature sensor 30 as an oil temperature detector for detecting the oil temperature in the tank 33.

Then, as shown in FIG.
The upper and lower limit switches L serving as position detectors for detecting the position of the elevating plate 15 are provided on the wall surfaces of the refuse input box 6 corresponding to the ascending position and the descending position, respectively.
S1 and LS2 are provided. A terminal T1 is provided at the upper end of the elevating plate 15 for contacting the ascending and descending limit switches LS1 and LS2. The ascending and descending limit switches LS
1 and LS2 are provided a predetermined distance before the lifting operation stop position and the lowering operation stop position of the elevating plate 15 (the positions of the ascending and descending limit switches LS1 'and LS2' shown by two-dot chain lines in FIG. 1). The detection by contact with the terminal T1 is performed a predetermined distance before the ascending operation stop position and the descending operation stop position.

A plate-shaped bracket 41 projecting rearward is attached to the elevating plate 15.
The vertical position of the bracket 41 corresponding to the extension position and the contraction position of the pushing cylinder 23 respectively includes extension and contraction sides as position detectors for detecting the position of the cylinder tube 23a that moves up and down when the pushing cylinder 23 expands and contracts. Limit switches LS3 and LS4 are provided. A terminal T2 is provided at the upper end (end on the rod side) of the cylinder tube 23a to contact the extension side and contraction side limit switches LS3, LS4. The extension side and contraction side limit switches L
S3 and LS4 are the extension operation stop position and the contraction operation stop position of the pushing cylinder 23 (the extension side and contraction side limit switches LS3 'and LS indicated by the two-dot chain line in FIG. 1).
4 ′), and the detection by contact with the terminal T2 is performed a predetermined distance before the extension operation stop position and the contraction operation stop position.

As shown in FIG. 3, the first solenoid-operated switching valve 34 supplies an excitation command to the second solenoid SOL2 of the second solenoid-operated switching mechanism 39 or the first solenoid SOL1 of the first solenoid-operated switching mechanism 38. A signal is output to switch to the head-side chamber communication position or the rod-side chamber communication position, while the terminal T1 comes into contact with the ascending-side limit switch LS1 or the descending-side limit switch LS2, and the ascending-side limit switch LS1 or the ascending-side limit switch L
The first electromagnetic switching valve is controlled by the operation control device 42 so as to output a demagnetization command signal to the second solenoid SOL2 or the first solenoid SOL1 after inputting the detection signal from S2 and to switch to the cutoff position. By switching 34 to the head side chamber communication position or the rod side chamber communication position, the pressure oil supplied from the tank 33 via the first oil passage 32a to the fourth oil passage 32d or the third oil passage 32c via the second oil passage 32b. The first hydraulic switching valve 34 is switched to the shut-off position to extend the second hydraulic passage 32b to the fourth hydraulic passage 32.
d or the third oil passage 32c is disabled so that the elevating cylinder 19 is stopped from expanding and contracting, and the elevating operation of the elevating plate 15 is stopped. Further, the second electromagnetic switching valve 35 outputs an excitation command signal to the fourth solenoid SOL4 of the second electromagnetic switching valve mechanism 39 or the third solenoid SOL3 of the first electromagnetic switching valve mechanism 38 to output the head side chamber communication position or While being switched to the rod side chamber communication position, the extension side limit switch LS3 or the contraction side limit switch LS4
The terminal T2 comes into contact with the terminal T2 to detect the push cylinder 23 (cylinder tube 23a) a predetermined distance before the extension operation stop position and the contraction operation stop position, and the detection signal from the extension side limit switch LS3 or the contraction side limit switch LS4. After being input, the operation control unit 42 outputs a demagnetization command signal to the fourth solenoid SOL4 or the third solenoid SOL3 to switch to the shut-off position, and moves the second electromagnetic switching valve 35 to the head side chamber communication position. Or by switching to the rod side chamber communication position,
The pushing cylinder 2 is driven by pressure oil supplied from the tank 33 via the second oil passage 32b and the fifth oil passage 32e via the seventh oil passage 32g or the sixth oil passage 32f via the oil passage 32a.
3, the second electromagnetic switching valve 35 is switched to the shut-off position, whereby the fifth oil passage 32e cannot be communicated with the seventh oil passage 32g or the sixth oil passage 32f, so that the pushing cylinder 23 can be extended or contracted. The operation is stopped. In this case, the time required for switching the first and second electromagnetic switching valves 34 and 35 from the head-side chamber communication position or the rod-side chamber communication position to the shut-off position depends on the first time in cold regions where oil temperature is low or in winter. The first oil passage 36a and the third oil passage 36a and the third oil passage are delayed in a warm region where the oil temperature is high or in summer, for example, because the viscosity of the pressure oil discharged through the oil passage 36a and the third oil passage 36c increases. Since the viscosity of the pressure oil supplied via 36c is low, the pressure oil is shortened, and the ascending-side and descending-side limit switches LS1, LS2 and the extending-side and contracting-side limit switches LS3, LS4 are moved from the respective operation stop positions. The first and second solenoid-operated directional control valves 34 and 35 are switched after the elapse of the required time after the detection of the elevating plate 15 and the pushing cylinder 23 at the time of low oil temperature. And elevating plate 15 and push the cylinder 23 is not allowed to exceed deactivation position also.

Further, in addition to the detection signals from the limit switches LS1 to LS4, a detection signal from the oil temperature sensor 30 is input to the operation control device 42. The solenoids SOL1 to SOL of the first and second electromagnetic switching valve mechanisms 38 and 39 are configured to switch the switching valves 34 and 35 from the respective communication positions to the shutoff positions.
The output timing of the demagnetization command signal from the operation control device 42 to be output to the actuator 4 is determined by the output timing changing means 43 when the positions of the lift plate 15 and the pushing cylinder 23 are detected, that is, by the detection from the limit switches LS1 to LS4. The change is made based on the required switching time of each of the electromagnetic switching valves 34 and 35 which differs according to the oil temperature at the time of inputting the signal.

Here, the change control of the output timing changing means 43 for the first to fourth solenoids SOL1 to SOL4 of each of the electromagnetic switching valves 34 and 35 will be described with reference to the flowcharts of FIGS. In this flow, one cycle of the dust loading device 13 from the state where dust is thrown into the dust throwing box 6 until the dust pushing operation is performed to return to the original position (the dust throwable position) will be described. in this case,
The lifting plate 15 is stopped at the lifting operation stop position, and the pushing cylinder 23 is stopped at the extension operation stopping position.

First, as shown in FIG. 5, after the start, in a step S1, an excitation command signal for exciting the third solenoid SOL3 of the first electromagnetic switching valve mechanism 38 of the second electromagnetic switching valve 35 to the third solenoid SOL3. By switching the second electromagnetic switching valve 35 to the rod-side chamber communication position,
The pushing cylinder 23 is contracted. Thereafter, in step S2, it is determined whether or not the detection signal from the contraction side limit switch LS4 has been input, and the process stands by until the detection signal from the contraction side limit switch LS4 is input. When the detection signal from the contraction side limit switch LS4 is input, the detection signal (oil temperature) from the oil temperature sensor 30 is input in step S3. Then, step S
In step 4, the required switching time of the second electromagnetic switching valve 35 according to the oil temperature is calculated, and in step S5, the pushing cylinder 2 at the time of input of the detection signal from the contraction side limit switch LS4 is calculated.
3 waits until the subtraction time obtained by subtracting the switching required time in step S4 from the time until the contraction operation stop position is reached, and at the time when the subtraction time has elapsed, in step S6, the second electromagnetic switching valve 35 A demagnetizing command signal for demagnetizing the third solenoid SOL3 is output to the third solenoid SOL3 of the first electromagnetic switching valve mechanism 38, and the pushing cylinder 23 is switched during the required switching time calculated in step 4.
Is contracted, and the second
The electromagnetic switching valve 35 is switched to the shut-off position, and the push cylinder 2
The contraction operation of Step 3 is stopped, and the pushing cylinder 23 is stopped at the contraction operation stop position. In this case, the calculation of the required switching time of the second electromagnetic switching valve 35 in step S4 is performed based on a map calculated in advance according to the oil temperature.

Next, in step S7, an excitation command signal for exciting the first solenoid SOL1 is output to the first solenoid SOL1 of the first electromagnetic switching valve mechanism 38 of the first electromagnetic switching valve 34, and the first electromagnetic switching valve 34 Is switched to the rod side chamber communication position, whereby the elevating cylinder 19 is contracted, and the lowering operation of the elevating plate 15 is started. Then, step S
At 8, it is determined whether or not the detection signal from the lower limit switch LS2 has been input, and the process waits until the detection signal from the lower limit switch LS2 is input.
When the detection signal from the descending limit switch LS2 is input, in step S9, the time required for switching the first electromagnetic switching valve 34 according to the oil temperature (detection signal) from the oil temperature sensor 30 in step S3. In step S10, the subtraction time obtained by subtracting the time required for switching in step S9 from the time required for the lifting plate 15 to reach the lowering operation stop position at the time when the detection signal is input from the lower limit switch LS2 is elapsed. When the deduction time is reached, a demagnetization command signal is output to the first solenoid SOL1 of the first electromagnetic switching valve mechanism 38 of the first electromagnetic switching valve 34 in step S11. The elevating cylinder 19 contracts during the required switching time, and the first solenoid-operated directional control valve 34 is set to the shut-off position according to the required switching time. Switched, the contraction operation of the elevating cylinder 19 is stopped to stop the elevator plate 15 to the lowering operation stop position. In this case, the calculation of the required switching time of the first electromagnetic switching valve 34 in step S9 is also performed based on a map calculated in advance according to the oil temperature.

Thereafter, as shown in FIG.
2, the fourth solenoid SOL4 of the second electromagnetic switching valve mechanism 39 of the second electromagnetic switching valve 35 is connected to the fourth solenoid SO4.
By outputting an excitation command signal for exciting L4 and switching the second electromagnetic switching valve 35 to the head-side chamber communication position, the push cylinder 23 is extended and the push plate 21 starts to swing forward. Thereafter, in step S13, it is determined whether or not the detection signal from the extension side limit switch LS3 has been input, and the process waits until the detection signal from the extension side limit switch LS3 is input. Then, when the detection signal from the extension side limit switch LS3 is input, step S
In step S14, the time required for switching the second electromagnetic switching valve 35 according to the oil temperature from the oil temperature sensor 30 in step S3 is calculated, and in step S15, the extension-side limit switch LS
3 from the time until the push cylinder 23 reaches the extension operation stop position at the time of input of the detection signal from Step 3.
Then, the process waits until the subtraction time obtained by subtracting the switching required time from step 14 elapses.
At 16, a demagnetization command signal is output to the fourth solenoid SOL4 of the second electromagnetic switching valve mechanism 39 of the second electromagnetic switching valve 35, and the pushing cylinder 23 is extended during the switching required time calculated at the step 14, and the pushing cylinder 23 is extended. The second solenoid-operated directional control valve 35 is switched to the shut-off position according to the required switching time,
The pushing cylinder 23 is stopped at the extension operation stop position.

Thereafter, in step S17, the first
An excitation command signal is output to the second solenoid SOL2 of the second electromagnetic switching valve mechanism 39 of the electromagnetic switching valve 34, and the first electromagnetic switching valve 34 is switched to the head-side chamber communication position, thereby extending the elevating cylinder 19 and elevating the elevating plate. 15 ascending operation is started. Then, in step S18, the process waits until a detection signal is input from the ascending limit switch LS1. In step S19, the first electromagnetic switching valve 34 is switched according to the oil temperature from the oil temperature sensor 30 in step 3 described above. Calculate the required time. Then, in step S20,
At step S21, the process waits until a subtraction time obtained by subtracting the time required for switching in step S19 from the time until the lifting plate 15 reaches the lifting operation stop position at the time of detection signal input from the rising side limit switch LS1. First
The demagnetization command signal is output to the second solenoid SOL2 of the second electromagnetic switching valve mechanism 39 of the electromagnetic switching valve 34,
The elevating cylinder 19 is extended during the required switching time calculated in step 9, and the first electromagnetic switching valve 34 is switched to the shut-off position according to the required switching time, thereby stopping the elongating cylinder 19 and moving the elevating plate 15 down. The dust loading device 13 is stopped at the raising operation stop position, and the dust loading device 13 returns to the original position where dust can be put in, and one cycle of the dust loading operation by the dust loading device 13 ends.

In this case, the time required for switching the solenoid-operated directional control valves 34 and 35 is delayed by the pressure oil which becomes viscous in a cold district or winter season.
10, the change according to the oil temperature is made such that the subtraction time of step S15 and step S20 is shortened and the output timing of the demagnetization command signal of step S6, step S11, step S16 and step S21 is advanced. On the other hand, since the switching time of each of the solenoid-operated directional control valves 34 and 35 is shortened by the pressure oil whose viscosity becomes low in a warm region or a summer season, the subtraction time of the above steps S5, S10, S15 and S20 becomes long. Step S6, Step S11, Step S1
6 and a change corresponding to the oil temperature is made to delay the output timing of the demagnetization command signal in step S21.

Therefore, in the above-described embodiment, the first and second electromagnetic switching valve mechanisms 38, 38 for switching the first and second electromagnetic switching valves 34, 35 from the respective communicating positions to the shut-off position.
The output timing of the demagnetization command signal from the operation control device 42 to each of the solenoids SOL1 to SOL4 is the limit switch LS1 that detects the position of the lifting plate 15 and the pushing cylinder 23 at a position before each operation stop position.
The detection signals from the ascending and descending limit switches LS1 and LS2 and the detecting signals from the extending and contracting limit switches LS3 and LS4 are received by the output timing changing means 43 to which the detection signals from. Since the temperature is changed based on the required switching time of the first and second solenoid-operated directional control valves 34 and 35 depending on the oil temperature at the time, the oil temperature is low and the viscosity is high in a cold region or in winter. Each electromagnetic switching valve 34, 35
When the low oil temperature takes a long time to switch, the elevating plate 15 and the pushing cylinder 23 reach their respective operation stop positions in consideration of the time required for switching the electromagnetic switching valves 34 and 35 at the low oil temperature. A demagnetization command signal is output to an arbitrary solenoid at a point in time when a short subtraction time elapses until a subtraction time obtained by subtracting a required switching time from a time until the time elapses, that is, immediately after a detection signal is input from each of the limit switches LS1 to LS4. By doing so, the lifting plate 15 and the pushing cylinder 23 are connected to the respective limit switches LS1 to LS
While operating in the section between the position detected by 4 and each operation stop position, each electromagnetic switching valve 34, 35 is switched, and the lifting plate 15 and the pushing cylinder 23 are reliably stopped at the operation stop position. Therefore, the extension / retraction operation of the lifting / lowering cylinder 19 and the pushing cylinder 23 for operating the lifting / lowering plate 15 is reliably prevented from exceeding the extension / contraction operation limit position. It is possible to prevent the generation of abnormal noise accompanied by the impact of.

On the other hand, the first and second solenoid-operated directional control valves 34, 3 are provided by high-temperature, low-viscosity pressure oil in a warm region or in summer.
5 at high oil temperature when the required switching time is short, each of the limit switches LS1 to LS at a position before the operation stop position.
4, when a long subtraction time elapses from the time from when the elevating plate 15 and the pushing cylinder 23 reach their respective operation stop positions to the time when the switching required time is subtracted, at the time when the detection signal is input, that is, By outputting the demagnetization command signal from the output timing changing means 43 to an arbitrary solenoid at a later timing after a while from the detection signal input from each of the limit switches LS1 to LS4, the lifting plate 15 and the pushing cylinder 23 After a while after passing through the detection position by the switches LS1 to LS4, the respective electromagnetic switching valves 34 and 35 are switched,
After the lifting plate 15 and the pushing cylinder 23 have been operated to their respective operation stop positions, they are reliably stopped. Therefore, even at the time of high oil temperature, as soon as the detection signal is received from the limit switch at a position before each operation stop position, the lift control plate 15 outputs a command signal to the electromagnetic switching valve as soon as receiving the detection signal.
Also, the pushing cylinder 23 does not stop immediately before each operation stop position, and the pushing plate 21 does not reach the height facing the dust loading port 4a, so that a gap due to a height difference between the pushing cylinder 21 and the dust occurs. Problems such as insufficient loading pressure in the storage box 4 can be resolved, and operation failure of the dust loading device 13 can be prevented.

In the above embodiment, the lifting cylinder 1
9 by means of detection signals from the limit switches LS1 and LS2 for detecting the lift plate 15 operated by the lift plate 15.
Is controlled to stop at the lifting / lowering operation stop position, so that the lifting / lowering plate 15 actually operated by the lifting / lowering cylinder is accurately controlled. Is performed smoothly, and the operation of the dust loading device 13 can be accurately stopped.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In the second embodiment, the configuration of the dust loading device is changed.

That is, in this embodiment, as shown in FIG. 8, the dust loading device 51 has a substantially middle portion pivotally supported on the side wall surface of the dust insertion box 6 via the shaft 50, and has one end in the front-rear direction. A push plate 52 for swinging the push plate 52, a rod end rotatably supported at the other end of the push plate 52, a pair of push cylinders 53 as an actuator for operating the push plate 52, and a 360 ° rotation about the base end as a fulcrum Possible rotating plate 54 and the rotating plate 54
A shaft 55a is attached to a base end of the rotary plate, and a hydraulic motor 55 as an actuator for rotating the rotary plate 54 is provided. The rotary type is configured to load dust by cooperation of the pushing plate 52 and the rotary plate 54. ing. FIG.
As shown in FIG. 7, the rod-side chamber of each of the pushing cylinders 53 is connected to one end of the third oil passage 32c, and the head-side chamber is connected to one end of the fourth oil passage 32d. The hydraulic motor 55
Is connected between one end of the sixth oil passage 32f and one end of the seventh oil passage 32g, and rotates forward (rotates clockwise in the drawing) by supply of pressure oil from the sixth oil passage 32f side. On the other hand, the pressure oil is supplied from the side of the seventh oil passage 32g to rotate in the reverse direction (counterclockwise rotation in the figure).

As shown in FIG. 7, a position for detecting the position of the tip end of the cylinder rod 53a of the pushing cylinder 53 is provided on the wall surface of the dust bin 6 corresponding to the extending position and the contracting position of the pushing cylinder 53, respectively. Expansion-side and contraction-side limit switches LS5 and LS as detectors
6 are provided. The extension-side limit switch LS5 detects that one end of the push plate 52 is positioned at the lower end of the loading port 4a, while the contraction-side limit switch LS6 has one end of the push plate 52 connected to the hydraulic motor 5.
5 is detected on the axis 55a. Further, a terminal T3 which contacts the extension side and contraction side limit switches LS5, LS6 is provided at the tip of the cylinder rod 53a of the pushing cylinder 53. The extension side and contraction side limit switches LS
5 and LS6 are the extension operation stop position and the contraction operation stop position of the push cylinder 53 (extension side and contraction side limit switches LS5 ', LS6 indicated by two-dot chain lines in FIG. 7).
(Position '), so that detection by contact with the terminal T3 is performed a predetermined distance before the extension operation stop position and the contraction operation stop position.

Further, on the wall surface of the dust bin 6 corresponding to the base end of the rotating plate 54, a position detection for detecting that the tip of the rotating plate 54 is located at a height position facing the dust loading port 4a. A rotary plate limit switch LS7 as a vessel is provided. Further, a terminal T4 that contacts the rotary plate limit switch LS7 is provided at the base end of the rotary plate 54. The rotary plate limit switch LS7 is a rotary operation stop position (the rotary plate limit switch L shown by a two-dot chain line in FIG. 7) in which the tip of the rotary plate 54 faces the lower edge of the dust loading port 4a.
(Position of S7 ') and a predetermined distance before
Detection by contact with the terminal T4 is performed a predetermined distance before the rotation stop position.

Further, as shown in FIG. 9, the first solenoid-operated switching valve 34 has a second solenoid SOL2 or a first solenoid SOL2.
An excitation command signal is output to the solenoid SOL1 to be switched to the head-side chamber communication position or the rod-side chamber communication position, while the terminal T3 comes into contact with the extension-side limit switch LS5 or the contraction-side limit switch LS6 and the extension-side limit switch LS5 or LS5. Retraction side limit switch L
The first electromagnetic switching valve is controlled by the operation control device 42 so as to output a demagnetization command signal to the second solenoid SOL2 or the first solenoid SOL1 after inputting the detection signal from S6 and to switch to the cutoff position. 34 is switched to the head-side chamber communication position or the rod-side chamber communication position, thereby enabling the push-in cylinder 53 to expand and contract. The first electromagnetic switching valve 34 is switched to the shut-off position to switch the second oil passage 32.
The pressure oil from b is not communicated with the fourth oil passage 32d or the third oil passage 32c, and the expansion and contraction operation of the pushing cylinder 53 is stopped. Further, the second electromagnetic switching valve 35 outputs an excitation command signal to the fourth solenoid SOL4 of the second electromagnetic switching valve mechanism 39 or the third solenoid SOL3 of the first electromagnetic switching valve mechanism 38, and outputs the reverse rotation side communication position. Alternatively, while being switched to the forward rotation side communication position, the terminal T4 comes into contact with the rotary plate limit switch LS7 and the detection signal from the rotary plate limit switch LS7 is input, and then the signal is applied to the fourth solenoid SOL4 or the third solenoid SOL3. The operation control device 42 is controlled to output a demagnetization command signal and switch to the shut-off position. By switching the second electromagnetic switching valve 35 to the reverse rotation side communication position or the forward rotation side communication position, the pressure oil is discharged. Second oil passage 32b and fifth oil passage 32e
Through the seventh oil passage 32g or the sixth oil passage 32f to the hydraulic motor 55 to enable the rotation of the rotary plate 54, and to switch the second electromagnetic switching valve 35 to the shut-off position, so that the fifth oil passage The rotation of the rotary plate 54 is stopped by disabling the pressure oil from the nozzle 32e. The detection signal from the oil temperature sensor 30 as well as the detection signal from the extension side limit switch LS5 and the contraction side limit switch LS6 and the detection signal from the rotary plate limit switch LS7 are input to the operation control device 42. It has become so.
The other configuration except for the refuse loading device is the same as that of the above-described embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

Here, the change control of the output timing changing means 43 for the first to fourth solenoids SOL1 to SOL4 of each of the electromagnetic switching valves 34 and 35 is shown in FIGS.
A description will be given based on the flowchart of FIG. In this flow, one of the refuse loading devices 13 from the state where the refuse is loaded into the refuse input box 6 to the time when the refuse pushing operation is performed to return to the original position.
The cycle will be described. In this case, the pushing plate 52 is stopped at the front operation stop position, and the rotary plate 54 is stopped at the rotation operation stop position, in preparation for the start of control.

First, as shown in FIG. 11, after the start,
In step S51, an excitation command signal is output to the third solenoid SOL3 of the first electromagnetic switching valve mechanism 38 of the second electromagnetic switching valve 35, and the second electromagnetic switching valve 35 is switched to the forward rotation side communication position. 55 is rotated forward to start the forward rotation operation of the rotating plate 54, and in step S52, it waits until the rotating plate 54 rotates a predetermined angle to a position where it does not interfere with the rotating plate 54 even if the pushing plate 52 starts rotating, At the time when the rotary plate 54 has rotated by the predetermined angle, in step S53, an excitation command signal is output to the first solenoid SOL1 of the first electromagnetic switching valve mechanism 38 of the first electromagnetic switching valve 34, and the first
By switching the electromagnetic switching valve 34 to the head side chamber communication position, the pushing cylinder 53 is contracted to start the backward swinging of the pushing plate 52. Then, in step S54,
It is determined whether or not the detection signal from the contraction side limit switch LS6 has been input, and waits until the detection signal from the contraction side limit switch LS6 is input. When the detection signal from the contraction-side limit switch LS6 is input, the detection signal (oil temperature) from the oil temperature sensor 30 is input in step S55.

Next, in step S56, the time required for switching the first electromagnetic switching valve 34 in accordance with the oil temperature is calculated, and in step S57, the push-in cylinder 53 contracts when the detection signal is input from the contraction side limit switch LS6. It waits until a subtraction time obtained by subtracting the required switching time in step S56 from the time until the operation stop position is reached,
At the time when the subtraction time has come, in step S58, a demagnetization command signal is output to the first solenoid SOL1 of the first electromagnetic switching valve mechanism 38 of the first electromagnetic switching valve 34, and the required switching time calculated in step 56 is calculated. In the meantime, the pushing cylinder 53 is contracted, and the first solenoid-operated switching valve 34 is switched to the shut-off position at the time required for the switching, and
The retracting operation of the pushing cylinder 53 is stopped and stopped at the retracting operation stop position, and the backward swing of the pushing plate 52 is stopped.

Thereafter, as shown in FIG.
At 59, it is determined whether or not the detection signal from the rotary plate limit switch LS7 has been input, and the process stands by until the detection signal from the rotary plate limit switch LS7 is input. When the detection signal from the rotary plate limit switch LS7 is input, in step S60, the time required for switching the second electromagnetic switching valve 35 according to the oil temperature from the oil temperature sensor 30 in step S55 is calculated. In step S61, the process waits until a subtraction time obtained by subtracting the switching time in step S60 from the time until the rotating plate 54 reaches the rotation stop position at the time of inputting the detection signal from the rotating plate limit switch LS7, At the time when the subtraction time has come, in step S62, a demagnetization command signal is output to the third solenoid SOL3 of the second electromagnetic switching valve mechanism 38 of the second electromagnetic switching valve 35, and the above-described step 60 is performed.
The rotation plate 54 rotates forward during the required switching time calculated in step 2, and at the time when the required switching time is reached, the second electromagnetic switching valve 35 is switched to the shut-off position, and the rotation operation of the hydraulic motor 55 is stopped. The rotation plate 54 is stopped at the rotation stop position. Thereafter, in step S63, the first
An excitation command signal is output to the second solenoid SOL2 of the second electromagnetic switching valve mechanism 59 of the electromagnetic switching valve 53, and the first electromagnetic switching valve 35 is switched to the head side chamber communication position, whereby the pushing cylinder 53 is extended and pushed. The forward swing of the plate 52 is started, and in step S64, the extension-side limit switch LS5
It is determined whether or not the detection signal from the extension side limit switch LS5 is input. When the detection signal is input from the extension-side limit switch LS5, in step S65,
The time required for switching the first electromagnetic switching valve 35 according to the oil temperature from the oil temperature sensor 30 in step S55 is calculated, and in step S66, the pushing cylinder 53 at the time of input of the detection signal from the extension side limit switch LS5 is It waits until a subtraction time obtained by subtracting the switching required time in step S65 from the time until the extension operation stop position is reached,
At the time when the subtraction time has come, in step S67, a demagnetization command signal is output to the second solenoid SOL2 of the second electromagnetic switching valve mechanism 38 of the first electromagnetic switching valve 34, and the switching required time calculated in step 65 is calculated. The push-in cylinder 53 is extended during this time, and the first solenoid-operated directional control valve 34 is switched to the shut-off position when the time required for the switching is reached,
The extension operation of the pushing cylinder 53 is stopped, and the pushing cylinder 53 is stopped at the extension operation stop position.
3 and the cycle of returning the dust loading device 13 to the original position where dust can be put in is ended.

Therefore, also in the above embodiment, the first
Output timing of the demagnetization command signal from the operation control device 42 to each of the solenoids SOL1 to SOL4 of the first and second electromagnetic switching valve mechanisms 38 and 39 for switching the second and third electromagnetic switching valves 34 and 35 from the respective communication positions to the shut-off positions. The push cylinder 53 is located at a position before each operation stop position.
The output timing changing means 43, which has rapidly input the detection signals from the limit switches LS5 to LS7 for detecting the position of the rotary plate 54, detects the positions of the push cylinder 53 and the rotary plate 54, that is, the extension side and contraction side limit switches. The change is made based on the required switching time of the first and second electromagnetic switching valves 34 and 35 depending on the oil temperature at the time when the detection signals from LS5 and LS6 and the detection signal from the rotary plate limit switch LS7 are received. At low oil temperature, such as in cold regions or in winter,
By outputting a demagnetization command signal to an arbitrary solenoid at an early timing immediately after the detection signals are input from the limit switches LS5 to LS7, the push plate 52 and the rotary plate 54 are reliably stopped at the respective operation stop positions, The pushing cylinder 53 is prevented from hitting the bottom, so that it is possible to prevent the generation of abnormal noise accompanying the impact at the time of hitting the bottom.

On the other hand, when the oil temperature is high such as in a warm region or in summer,
By outputting a demagnetization command signal from the output timing changing means 43 to an arbitrary solenoid at a later timing after a while from the detection signal input from each of the limit switches LS5 to LS7, the push plate 52 and the rotary plate 54 are activated. After the operation reaches the stop position, the operation is reliably stopped. At high oil temperature, the push plate 52 and the rotary plate 54 do not stop immediately before each operation stop position, and the operation failure of the dust loading device 13 is prevented. Similarly, it can be prevented.

The present invention is not limited to the above embodiments but includes various other modifications. For example, in the first embodiment, the operations of the lifting plate 15 and the push cylinder 23 are controlled, but the lifting and lowering is performed by a detection signal from a limit switch that detects a lifting cylinder that operates the lifting plate and a push plate that is operated by the pushing cylinder. The cylinder and the pushing plate may be controlled. In the second embodiment, the operations of the push cylinder 53 and the rotary plate 54 are controlled. However, a detection signal from a limit switch that detects the rotation amount of a hydraulic motor that operates the push plate and the rotary plate operated by the push cylinder is provided. The push plate and the hydraulic motor may be controlled by the control.

[0047]

As described above, according to the refuse loading control device of the refuse collection vehicle according to the first aspect of the present invention, the command signal from the operation control device to the solenoid-operated directional control valve is controlled by the low oil having a long switching time. The output timing is changed to output at an early timing immediately after the detection at the front position of the actuator at the time of warming, and to output at a later timing after a while from the detection time at the front position of the actuator at the time of high oil temperature where the switching time is short. Means, the actuator can be reliably stopped at the operation stop position irrespective of the oil temperature difference, the bottom of a hydraulic cylinder or the like can be prevented, and the generation of abnormal noise accompanying the impact of the bottom can be prevented. In addition, it is possible to prevent an operation failure of the refuse loading device.

According to the refuse loading control device for a refuse collection vehicle according to the second aspect of the present invention, the command signal from the operation control device to the electromagnetic switching valve is immediately detected at a low oil temperature immediately before the plate. The output timing is changed by the output timing change means so that it is output at an earlier timing, while it is output at a later timing after a while from the time of detection at the position in front of the plate at high oil temperature. And the operation of the refuse loading device can be stopped more accurately.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a dust bin, schematically showing a layout of each limit switch of the dust loading device according to the first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the refuse input box.

FIG. 3 is a control block diagram of the operation control device.

FIG. 4 is a hydraulic circuit diagram of the dust loading device.

FIG. 5 is a flowchart showing a first half of a change control of an output timing of a command signal from the operation control device to the dust loading device.

FIG. 6 is a flowchart showing the latter half of the control for changing the output timing of the command signal from the operation control device to the dust loading device.

FIG. 7 is a view corresponding to FIG. 1 according to a second embodiment of the present invention.

FIG. 8 is a diagram corresponding to FIG. 2;

FIG. 9 is a diagram corresponding to FIG. 3;

FIG. 10 is a diagram corresponding to FIG. 4;

FIG. 11 is a flowchart showing the first half of the control for changing the output timing of the command signal from the operation control device to the refuse loading device.

FIG. 12 is a flowchart showing the latter half of the change control of the output timing of the command signal from the operation control device to the dust loading device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust collection vehicle 2 Chassis frame (body frame) 4 Dust storage box 4a Dust loading port 6 Dust loading box 11 Input port 13 Dust loading device 15 Lifting plate (plate) 23 Push cylinder (actuator) 30 Oil temperature sensor (oil) Temperature detectors) 32a to 32h Oil passages 34, 35 Solenoid switching valves 36a, 37a First separate oil passage (another oil passage) 36b, 37b Second separate oil passage (another oil passage) 42 Operation control device 43 Output timing Changing means 53 Push cylinder (actuator) 54 Rotating plate (plate) LS1 to LS7 Limit switch (position detector)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiyuki Tanaka 2nd Sakaemachi, Sano City, Tochigi Prefecture Shinmeiwa Industrial Co., Ltd. (72) Inventor Hiroshi Tokunaga 2nd Sakaemachi Sano City, Tochigi Prefecture Shinmeiwa Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) B65F 3/00

Claims (2)

(57) [Claims] 1. A refuse storage box having a refuse loading port on a rear wall is mounted on a body frame of a refuse collection vehicle, and a refuse loading box is connected to the refuse loading port of the refuse storage box so as to be tiltable. A dust loading device is provided inside the dust loading box, for loading the dust loaded from the input port of the dust loading box to the bottom through the dust loading port into the dust storage box, and the dust loading device is provided with the dust loading device. Loading of refuse is performed using a hydraulically driven actuator as a drive source, and the oil passage is connected to an oil passage connected to the actuator so as to be able to supply pressure oil from a hydraulic source. An electromagnetic switching valve is provided for switching between a communication position and a blocking position for interrupting communication of the oil passage, and the hydraulic oil is supplied to and discharged from the electromagnetic switching valve through an oil passage separate from the oil pressure to the actuator. It is configured to switch by the above electromagnetic By outputting a command signal for switching the electromagnetic switching valve to the communication position to the switching valve to supply hydraulic oil from a hydraulic source to the actuator to operate the actuator, the electromagnetic valve is operated when the actuator comes to the operation stop position. A refuse collection truck provided with an operation control device for controlling the control valve so as to shut off the supply of pressure oil to the actuator by outputting a command signal for switching the switching valve to the shut-off position and to stop driving the actuator. A position detector that detects the position of the actuator at a position before the operation stop position of the actuator is provided before the operation stop position of the actuator, and the oil pressure source has an oil temperature of the oil pressure source. An oil temperature detector for detection is provided, and detection signals from the position detector and the oil temperature detector are input to the operation control device. The output timing of a command signal from the operation control device for switching the electromagnetic switching valve to the shut-off position is determined according to the oil temperature at the time when the position of the actuator is detected at a position before the operation stop position of the actuator. A refuse loading control device for a refuse collection vehicle, further comprising output timing changing means for changing based on a required switching time of different electromagnetic switching valves. 2. A refuse storage box having a refuse loading port on a rear wall is mounted on a body frame of a refuse collection vehicle, and a refuse loading box is connected to the refuse loading port of the refuse storage box so as to be tiltable. A dust loading device is provided inside the dust loading box, for loading the dust loaded from the input port of the dust loading box to the bottom through the dust loading port into the dust storage box, and the dust loading device is provided with the dust loading device. Garbage is loaded by a plate that operates using a hydraulically-driven actuator as a drive source, and the oil is connected to an oil passage that is connected to the actuator so that pressure oil from a hydraulic source can be supplied. An electromagnetic switching valve is provided for switching between a communication position for communicating the passage and a shutoff position for interrupting the communication of the oil passage, and the electromagnetic switching valve is supplied and discharged through an oil passage separate from the pressure oil to the actuator. Switching by pressure oil By outputting a command signal for switching the electromagnetic switching valve to the communication position to the electromagnetic switching valve, the actuator is supplied with pressure oil from a hydraulic source to operate the plate, while the plate stops operating. An operation control device is provided for controlling the stop of the operation of the plate by outputting a command signal for switching the electromagnetic switching valve to the shut-off position when it comes to the position, thereby stopping the supply of the pressure oil to the actuator. In the garbage collection control device of the garbage truck, a position detector that detects a position of the plate at a position before the operation stop position of the plate is provided before the operation stop position of the plate, and the hydraulic pressure source includes: An oil temperature detector for detecting the oil temperature of the hydraulic pressure source is provided, and the operation control device inputs detection signals from the position detector and the oil temperature detector, An output timing of a command signal from the operation control device for switching the electromagnetic switching valve to the shut-off position may be different depending on the oil temperature at the time when the position of the plate is detected at a position before the operation stop position of the plate. A refuse loading control device for a refuse collection vehicle, comprising output timing changing means for changing based on the required switching time of the switching valve.