JPH0699002B2 - Kuramotsu pushing control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dust pushing control device for a dust truck, and more specifically,
A dust-pushing device that is attached to a packer that is connected to a dust-packing box of a garbage truck that collects dust, and the pushing plate moves in a cycle with up and down and forward / reverse to store the dust in the dust-packing box. The present invention relates to a dust indentation control device that can be used.

[Conventional technology]

In order to control the cycle motion mechanism of the pushing plate in the garbage truck, sensing devices such as cams and limit switches are connected to the movable parts of the mechanism, and this sensing device activates the cycle motion control device. There is. In this control device, since the sensing device is in contact with the moving part, it is easily worn, the cycle motion is disturbed, many structural sensing devices are required, and many failures occur, resulting in durability. There are some drawbacks.

As a solution to this problem, there is a cycle motion control device described in Japanese Patent Publication No. 51-48555. this is,
A proximity plate is attached to the drive shaft of the fluid pump, and a sensing device is arranged at a position facing the proximity plate. Then, each time the proximity plate approaches the sensing device as the fluid pump rotates, the high-frequency signal transmitted from the sensing device is changed, whereby the rotational speed of the fluid pump can be extracted. There is. A control device that receives a high-frequency signal from the sensing device is used for the cycle motion control of the pushing plate, and the sensing device measures the rotation speed of the fluid pump,
Count rotation control is performed by comparing the preset rotational speed set in the control device with the measured rotational speed, and a cycle motion of a predetermined stroke of the pushing plate such as reversing, descending, normal rotating, and ascending strokes is performed. At that time, the dust thrown into the packer is mainly compressed in the descending stroke and the forward stroke of the pushing plate, and is smoothly stored in the dust storage box in the ascending stroke following the forward stroke.

[Problems to be Solved by the Invention]

In recent years, large and hard wastes such as electric washing machines and electric refrigerators are often thrown in as dust to be thrown into a garbage truck. At that time, the push-in plate controlled by the above-mentioned control device of the count control type does not perform a special movement to press the hard waste that has been thrown in and efficiently collapse it. Especially, since the hard waste is not pressed in the ascending stroke and the movement to continue the crushing is not performed, the amount of the waste left in the packer in the ascending stroke is large, and the dust containing the hard waste is increased. Is difficult to be efficiently stored in the dust container.

The present invention has been made in view of the above problems, and an object thereof is that the pushing plate moved from the end position of the forward rotation stroke to the rising stroke, when encountering the solid waste being thrown in the rising stroke, It is an object of the present invention to provide a dust-pushing control device for a dust truck, which can sequentially press and crush the waste at different locations and efficiently push a large amount of waste into the dust storage box.

[Means for Solving the Problems]

The present invention, as shown in FIG. 1, is mounted inside a packer 3 which is continuously provided at the rear part of the dust storage box 1, and includes a push cylinder.
A slider 10 that is moved up and down by 14 and a push plate 11 that is pivotally supported by the slider 10 and that is normally inverted by a sweep cylinder 13.
And the push cylinder 14 and the sweep cylinder 13 are controlled so that the pushing plate 11 has a reverse stroke A, a downward stroke B, and a forward stroke C.
Also, the present invention is applied to a dust-pushing control device that performs a cycle motion including an ascending stroke D.

The feature is that the waste put in the packer 3
After the start of the upward stroke from the end position H1 of the forward rotation stroke C (see FIG. 6 (a)) in which the pushing plate 11 is secondarily pressed to press and crush 34, the sweep cylinder 13 and push cylinder 14
And are operated simultaneously, and if there is no sudden increase in the operating oil pressure in the hydraulic circuit during the simultaneous operation, the push cylinder 14 is operated only after the simultaneous operation for a predetermined period is completed.
11 is a single operation for raising the hydraulic pressure, and during the above simultaneous operation, if the pushing plate 11 encounters a hard waste 34 and the hydraulic pressure in the hydraulic circuit suddenly rises, the push cylinder 14 The operation command control means 29 (refer to FIG. 3) for independently operating only the pushing plate 11 to temporarily raise the pushing plate 11 and again operating the sweep cylinder 13 and the push cylinder 14 simultaneously after completion of the independent operation is provided. It is provided.

During the simultaneous operation of the sweep cylinder 13 and the push cylinder 14, when the hydraulic pressure in the hydraulic circuit suddenly rises, the simultaneous operation is maintained until a predetermined holding period elapses from that point, and then the independent operation is performed. The operation may be started. Further, when the hydraulic pressure in the hydraulic circuit suddenly rises, it is possible to terminate the simultaneous operation at that point and then shift to the independent operation. Further, even if the operating oil pressure in the hydraulic circuit suddenly rises, the simultaneous operation for a predetermined period may be completed and then the single operation may be performed.

[Action]

The dust pushing-in control device mounted inside the packer 3 connected to the rear portion of the dust storage box 1 is operated by a command signal from the operation command control means 29. That is, the pushing plate 11 pivotally supported by the slider 10 is reversed by the operation of the sweep cylinder 13 and takes the reverse stroke A which is the first stroke of the cycle motion. Waste 34 such as dust is put into the packer 3, the pushing plate 11 enters the downward stroke B by the operation of the push cylinder 14, and the waste 34 and dust are primarily pressed. Then, the sweep cylinder 13
The forward rotation stroke C is entered by the operation of, and the dust and the like are secondarily pressed by the forward rotation of the pushing plate 11. In the next ascending stroke D, the sweep cylinder 13 and the push cylinder 14 are simultaneously actuated by the command signal of the actuation command control means 29, as if the push-in plate 11 performs forward rotation and ascending simultaneously [5th See FIG. (A)]. If there is no sudden increase in the operating hydraulic pressure in the hydraulic circuit during the initial simultaneous operation, it means that there is no solid waste 34 in the vicinity of the pushing plate 11, and the pushing plate 11 is operated for a predetermined period of time. After the end, only the push cylinder 14 is operated to perform a single ascending operation, and the waste 34 is pushed into the dust container 1.

On the other hand, during the first simultaneous operation, if the pushing plate 11 encounters the solid waste 34 and the operating oil pressure in the hydraulic circuit rises rapidly (see FIG. 5 (b)), after the simultaneous operation is completed, Push plate
11 operates only the push cylinder 14 to shift to a single operation of a temporary rise. After the end of the independent operation, the sweep cylinder 13 and the push cylinder 14 are simultaneously operated again. In this way, when the hard waste 34 is encountered during the previous simultaneous operation, the position of the pressure crushing action is changed by a temporary rise, and the crushing is promoted by the simultaneous operation again.
The pushing plate 11 returns to the start position of the cycle while repeating such an independent operation and a simultaneous operation. As a result, due to the pressing operation of the push plate 11 at several different positions during the ascending stroke D, the amount of hard waste 34 or dust that has been hardened by being strongly compressed is left in the packer 3 to an extremely small amount, and the dust is reduced. It is efficiently stored in the storage box 1.

When the operating pressure in the hydraulic circuit suddenly rises during the simultaneous operation of the sweep cylinder 13 and the push cylinder 14, the simultaneous operation is maintained until a predetermined holding period elapses from that point [Fig. 5]. (See (b)), and if the operation is shifted to the independent operation thereafter, there is an advantage that the simultaneous operation becomes stable. Also, if a sudden increase in the operating oil pressure occurs in the hydraulic circuit, the simultaneous operation is terminated at that point, and then the operation is shifted to the independent operation [see FIG. Then, the movement of one cycle becomes smooth. Furthermore, even if the operating oil pressure in the hydraulic circuit suddenly rises, if the simultaneous operation for a predetermined period is completed [see FIG. It has the advantage of being simple.

〔The invention's effect〕

According to the present invention, simultaneous operation by the push cylinder and the sweep cylinder is performed so that the pushing plate can perform forward rotation and upward movement at the same time in the ascending stroke of the cycle motion performed by the instruction signal from the operation instruction control means. If there is a sudden increase in the operating hydraulic pressure in the hydraulic circuit when the state is in the state, the push plate is moved only to change the position of the push-in plate after that, and the push cylinder and the sweep cylinder simultaneously operate to dispose of waste. Can be pressed and crushed again at a different position. As a result, even if a dust containing solid waste is encountered in the ascending stroke, the waste can be pushed into the dust storage box quickly and efficiently. Therefore, even when counting or time-controlling each process, the solid waste and dust that are thrown in do not remain in the packer without being pushed into the dust storage box.

〔Example〕

 Hereinafter, the present invention will be described in detail based on examples thereof.

As shown in FIG. 1, a packer 3 is rotatably connected by a hinge pin 2 to a rear upper end of the dust storage box 1 placed on the vehicle frame of the dust truck, and the packer 3 is lowered. The opening 4 formed in the packer 3 communicates with the inside of the dust storage box 1. The packer 3 has a charging port 5 formed at a rear portion thereof, and an arcuate compression surface 6 recessed downward at a bottom portion continuing from the charging port 5 and rising obliquely upward toward the dust container 1 and the opening described above. A guide surface 7 continuous with the portion 4 is formed.

Dust and waste 34 are compressed in the packer 3 to collect dust 1
A dust pushing mechanism adapted to be pushed inside is accommodated. Hereinafter, the dust pushing mechanism and a device for controlling the mechanism will be described in detail. A guide groove 8 is formed on both side walls of the packer 3 from upper front to lower rear, and a pair of left and right sliders 10 having a pair of guide rollers 9a and 9b are slidably supported in the guide groove 8. There is. A push-in plate 11 is swingably supported by a pivot 12 between the lower ends of the sliders 10 and 10, and the push-in plate 11 is provided in a forward rotation direction between a bracket 11a protruding from the back of the slider 11 and the upper end of the slider 10. And both ends of the sweep cylinder 13 for swinging in the reversing direction are pivotally supported. At the middle of the slider 10 and the lower end of the packer 3, the slider is
Both ends of a push cylinder 14 for vertically moving 10 along the guide groove 8 are pivotally supported. Therefore,
By performing sequence control of the push cylinder 14 and the sweep cylinder 13, for example, as shown by a chain double-dashed line,
It is possible to cause the pushing plate 11 to perform a cycle motion consisting of four steps of a reverse stroke A, a primary stroke descending stroke B, a secondary stamping positive point stroke C, and an upward stroke D.

2 to 4 show a cycle motion device for causing the pushing plate 11 to perform a cycle motion. In FIG. 2, a fluid pump 17 is connected to a rotary shaft 16 of a power take-off device 15 connected to a traveling engine of a garbage truck, and a cycle shown in FIG. 3 is generated by hydraulic oil discharged from the fluid pump 17. The motor function 18 is activated.

The structure of the cycle motion mechanism 18 will be described with reference to FIG. The discharge pipe 19 of the fluid pump 17 is connected to the control valve 20a,
Further, it is connected to the other control valve 20b via a connecting pipe 19a. The control valve 20a is connected to the rod side chamber 23 and the piston side chamber 24 of the push cylinder 14 via the conduits 21 and 22, and the control valve 20b is connected to the rod side chamber 27 and the piston side chamber 28 of the sweep cylinder 13 via the conduits 25 and 26. It is connected to the. Control valve
20a is provided with solenoids SaB and SaA for switching it to the left port or the right port, and control valve 20b is provided with solenoids SbB and SbA for switching it to the left and right, respectively. SaB, SbA, SbB is a command signal from the operation command control means 29 described later,
Switch the ports of the control valves 20a and 20b that operate sequentially during one cycle, and push cylinder 14 and sweep cylinder
Controls 13 movements. Further, the discharge pipe 19 detects the presence or absence of a relief valve 32 that opens when the pressure is increased to the relief pressure to return the hydraulic oil to the tank, and a pressure increase equal to or higher than the inching pressure Pi set to a pressure lower than the relief pressure. The pressure sensor 33 is attached.

The rotary shaft 16 of the fluid pump 17 shown in FIG.
A letter-shaped proximity plate 30 is fixed, and in proximity to this proximity plate 30,
The sensing device 31 is arranged at a position facing this. The proximity plate 30 is not limited to one, and although not shown, for example, a plurality of proximity plates may be arranged on the circumference. And
When the proximity plate 30 approaches the sensing device 31, which is a proximity switch, due to the rotation of the rotary shaft 16, the high frequency transmitted from the proximity switch 31 is changed, whereby the rotation speed of the fluid pump 17 is extracted as a high frequency signal. be able to.

The operation command control means 29 that receives the high-frequency signal transmitted from the proximity switch 31 measures the actual rotation speed of the fluid pump 17, compares the measured rotation speed with a preset rotation speed, that is, When the count number based on the rotation of the fluid pump 17 and the set count number match or exceed,
The control valves 20a and 20b of the cycle motion mechanism 18 are instructed to be switched each time.

FIG. 4 shows a schematic structure of the operation command control means 29. This is, for example, a microcomputer, and comprises a fixed storage unit, an occasional write storage unit, a central processing unit, etc., which are not shown. Its function is to press and crush the waste 34 thrown into the packer 3, so that the pushing plate 11 [see FIG. 6 (a)] indicated by a chain double-dashed line and a solid line is in the middle of the positive point stroke C for secondary pressing.
When the ascending stroke D is entered from H2 or the end position H1, the sweep cylinder 13 and the push cylinder 14 are simultaneously operated for the first time so that the forward rotation and the ascent can be simultaneously performed, and the hydraulic pressure is increased during the first simultaneous operation. If there is no sudden increase in hydraulic pressure in the circuit, after the simultaneous operation for a predetermined period,
Only the push cylinder 14 is operated to raise the push-in plate 11, and the operation is a single operation following the broken line Y1. On the other hand, during the first simultaneous operation, if the pushing plate encounters a hard waste 34, compressed dust, etc., and a sudden increase in the operating oil pressure in the hydraulic circuit occurs, the push cylinder 14 is activated after the simultaneous operation ends. Actuated, the pushing plate temporarily rises to perform the first independent operation, and after the completion of the independent operation, the sweep cylinder 13
And the push cylinder 14 are operated to simultaneously operate the push-in plate 11.

As a concrete configuration thereof, a counting circuit L, an output circuit Q and an output holding circuit M are provided. The counting circuit L receives the high frequency signal transmitted from the sensing device 31 and measures the number of revolutions of the fluid pump 17, that is, the number of counts, by the binary method. The output circuit Q outputs an output signal to the output holding circuit M when the actually measured rotation number of the fluid pump 17 measured by the counting circuit L reaches or exceeds a preset set rotation number, that is, a set count number. Has become. The output holding circuit M
Is based on a signal from the output circuit Q, energizes or demagnetizes the solenoids SaA, SaB, SbA, SbB (see FIG. 3) for switching the control valves 20a, 20b, and the fluid pump 17
A rotary solenoid Sr that starts to increase the engine speed in the idling state to generate discharge pressure
y (not shown) is also excited or demagnetized. The output circuit Q also has a function of resetting the count number measured by the counting circuit L to 0 when each count number described later reaches a set maximum value.

In this example, the pushing plate 11 takes a cycle motion consisting of four steps A to D of reversing, descending, normal rotating, and ascending, and if solid waste is not pressed in the meantime, as shown in FIG. As shown in, the count number N0 is accumulated to complete one cycle. For example, in the upstroke D, the solenoid SbA may be temporarily excited, but the solenoid SaA is continuously excited,
When the push cylinder 14 is extended, the cumulative count N0 is 103
To the cycle completion. It should be noted that the count in each step and the like is such that the count number α based on the rotation speed of the fluid pump 17 while the electric signal goes through the control system is added. This count number α is determined by the fluid pump 17
Since the number of rotations of is not always constant, the number of rotations is generally different each time, and the number is 1 or 2.

By the way, when the pushing plate 11 encounters the solid waste 34 at the position G1 in the first simultaneous operation in the ascending stroke D [see FIGS. 6 (a), 5 (b) and (c)], the pushing plate 11 is pressed. Push cylinder 14 and sweep cylinder 13 [3rd
A sudden increase in the operating oil pressure may occur in the hydraulic circuit connected to [see FIG. Then, when the ascending / descending value detected by the pressure sensor 33 becomes equal to or higher than the set inching pressure Pi, the pushing plate 11 is moved to the independent operation of only a temporary rise after the initial simultaneous operation, and after the end, the second operation is performed again. It is designed to enter the second simultaneous operation. Further, when a sudden pressure increase occurs at the position G2 in the second simultaneous operation, the pushing plate 11 is set to perform the third simultaneous operation after the second independent operation. With the simultaneous operation of
During that time, the detection of boosting is ignored, and the simultaneous operation is restricted after the third independent operation is completed. Also, if there is no sudden boost in the first simultaneous operation,
As described above, the pushing plate 11 only moves up along the broken line Y1.
By the way, if there is no sudden ascent and descent in the second simultaneous operation, only the ascending along the broken line Y2 is made.

The pushing plate 11 that performs such an operation has a cumulative count N0.
It is elevated to the position W2 which is 156, and in this example, N0 = 156 to 166, that is, from the position W2 to the cycle start position.
A pushing stroke E is provided up to W1 so that the waste 34 can be pushed into the dust container 1 more efficiently by simultaneous operation. In the ascending stroke D,
Push cylinder 14 in the first simultaneous actuation of the push plate 11
Since the boosting time is required to start up,
There is a boost dead zone with a count number N5 = 5 [see FIG. 5 (b)] although it is about 0.4 seconds). this is,
The piston in the push cylinder 14 shown in FIG.
When the control valve 20a is located at the position indicated by the chain double-dashed line at the end of the downward stroke B and the control valve 20a is switched to the right port by operating the solenoid SaA for moving up the pushing plate 11, the piston side chamber 24 formed by the chain double-dashed line piston is formed. This is because it takes some time to increase the pressure. Therefore, in the subsequent simultaneous operation, the inside of the push cylinder 14 is started from the state where the pressure is increased,
No boost dead zone is provided [see FIG. 5 (b) and FIG. 6 (a)].

When the dead zone elapses, the pushing plate 11 performs the first simultaneous operation up to the set count number N6 = 10, and if the hard waste 34 is not encountered during the operation, the pressing plate 11 simultaneously operates for a predetermined period until N6 = 10. Continue to operate. Even in the second simultaneous operation, if the solid waste 34 is not encountered, the process is continued for a predetermined period until N9 = 10.

Here, the operation will be described in a visually easy-to-understand manner. Sixth
In FIG. 3A, when the push-in plate 11 of the chain double-dashed line that enters the forward rotation stroke C and performs the secondary press encounters the solid waste 34 at H2 on the way, the pressure increase of the hydraulic circuit causes the pressure sensor 33 [. See FIG. 3]. With the command signal of the operation command control means 29 to which the detection signal is input, the first simultaneous operation is performed from that position. In addition, as in the case of the pushing plate 11 indicated by the solid line, the forward rotation stroke C is completed without increasing the pressure and the start position H1 of the rising stroke D1.
When it reaches, the first simultaneous operation is performed from that position by the command signal set in the operation command control means 29. At that time, the solenoid SaA [see FIG. 3] is excited and the excitation of the solenoid SbA is maintained, and the piston side chamber 28 of the sweep cylinder 13 communicating with the rod side chamber 23 of the push cylinder 14 is transferred from the rod side chamber 23 to the hydraulic oil. Flows in and applies a pressing force that further rotates the pushing plate 11 toward the guide surface 7. As a result, the pushing plate 11 acts so as to push the hard waste and collapse it as much as possible.

In this way, when pushing plate 11 enters the first simultaneous operation,
After completion of the above-described count number N5 = 5, substantially the first simultaneous operation (thick solid line) is performed for a predetermined period corresponding to N6 = 10. However, if a hard waste is encountered with a count of N6 = 4, for example, the piston side chamber of the push cylinder 14
24 boosts. Along with this, when the pressure sensor 33 detects the pressure increase of the hydraulic circuit and the detected pressure Pc exceeds the inching pressure Pi, the count number N6 = 4 when the pressure increase occurs is stored in the operation command control means 29. Incidentally, if the boosting detection is maintained for, for example, one count after the detection of the inching pressure Pi, it is judged that the detection is normal, and the operation command control means 29
The following command is issued from to avoid malfunction caused by noise or the like.

When the solid line pushing plate 11 shown in FIG. 6 (a) simultaneously moves and follows the thick solid line, and there is a boost in the hydraulic circuit at N6 = 4 at position G1,
After N7 = 4 counts of the set holding period, the operation is shifted to the independent operation. That is, after N7 = 4 has elapsed (see FIG. 5 (b)), the solenoid SbA is demagnetized, and only the push cylinder 14 is operated by the solenoid SaA which is always kept in the energized state. The simultaneous operation and the independent operation are alternately performed, but the pressure rising position in the simultaneous operation is generally different. Then, for example, in the first simultaneous operation, when the pressure increase is detected at the position G1 of N6 = 4, the second simultaneous operation is scheduled, but in the second simultaneous operation, N9 =
The pressure rises at position G2 of 5. However, in any case, if there is a boost in the second time, the third simultaneous operation is scheduled. When reaching the position W2 where the cumulative count N0 = 156 including the simultaneous operation and the independent operation, the pushing plate 11 follows the pressing stroke E and returns to the cycle start position W1 where the cumulative count N0 = 166.

The push-in control device for the dust truck configured as described above operates one cycle including each of the reverse traveling, descending, forward rotating strokes A to C and the ascending stroke D as follows to raise the thrown-in dust. While being pressed and crushed in the process D, the solid waste 34 can be stored in the dust container 1 together with the dust.

As shown in the flow charts of FIGS. 7 (a) to (c),
When a pushing start command button (not shown) of the dust pushing device in the garbage truck is pressed, a start signal is input to the operation command control means 29. Then, the dust pushing device enters the idle up stroke I, the rotary solenoid Sry [see FIG. 5 (a)] is excited [S1], and is in an idling state in order to generate the discharge pressure in the fluid pump 17. The engine speed starts increasing. Then, counting of the count number N1 of the idle up stroke I is started [S2]. Immediately after the start of counting, N1 has not reached 3, and every time the proximity switch 31 detects a count signal corresponding to the rotation of the fluid pump 17, the count number α is added to N1 in step 2 and N1 increases. To do. And N1 ≧
When it becomes 3 [S3], N1 is added to the cumulative count number N0 [S4] and stored in the operation command control means 29 to end the idle-up stroke I. That is, the power take-off device of the garbage truck
15 (see FIG. 2) takes out a large amount of power from the engine, the power is supplied to the fluid pump 17 via the rotary shaft 16, and after a predetermined time has elapsed, the fluid pump 17 is brought into a steady operation at a specified rotation speed. As described above, each time the proximity plate 30 that rotates on the front surface of the proximity switch 31 approaches, the high-frequency signal for each rotation of the fluid pump 17 changes, and the number of changes is counted. It should be noted that the reason that N1 = N1 + α in step 2 is that the number of rotations of the rotary shaft 16 while the electric signal circulates is not necessarily the same each time, so the detected count number is added as α. It is as described above.

Subsequently, N1 is cleared [S5], the solenoid SbB is excited by the command signal of the operation command control means 29 [S6], and the pushing plate 11 is pressed.
Enters the reverse stroke A from the start position W1 of the cycle [see FIG. 6 (a)]. The counting of the count number N2 of the inversion process A is started [S7]. When the solenoid SbB is excited, the control valve 20b shown in FIG. 3 is switched to the left port, and the hydraulic oil from the fluid pump 17 is transferred to the rod side chamber of the sweep cylinder 13.
27 (see FIG. 3). As shown in FIG. 8 (a), the sweep cylinder 13 is supplied, and the pushing plate 11 is inverted in the direction away from the dust container 1 and becomes substantially horizontal. In this state, dust and waste are thrown into the packer 3 from the throwing port 5. When the count reaches 23 [S8],
The reverse stroke A is completed, N2 is added to the cumulative count N0 [S9], N2 is cleared [S10], and the solenoid SbB is demagnetized [S11].

Next, in response to the command signal from the operation command control means 29, the solenoid SaB
Is excited [S12] and the control valve 20b is returned to the neutral position by demagnetizing the solenoid SbB, while the control valve 20a is switched to the left port. The hydraulic oil of the fluid pump 17 is supplied to the rod side chamber 23 of the push cylinder 14, and the pushing plate 11 starts descending as the push cylinder 14 contracts. 8th
As shown in FIG. 6B, the slider 10 is moved integrally with the pushing plate 11 along the guide groove 8 by the reduction of the push cylinder 14. At the same time, counting of the count number N3 of the descending stroke B is started [S13], and it is determined whether the count number N3 of the pushing plate 11 has reached 38 [S14]. When N3 ≧ 38,
The piston of the push cylinder 14 in the contracted state is located at the stroke end, and the pushing plate 11 ends the descending stroke B. Then, N3 is added to the cumulative count number N0 [S1
5) and N3 is cleared [S16], and the solenoid
SaB is demagnetized [S17], and the control valve 20a is returned to the neutral position.

Then, the solenoid SbA is excited [S18], and the control valve 20b
Is switched to the right port, and as shown in FIG. 8 (c), the hydraulic oil from the fluid pump 17 is transferred to the piston side chamber 28 [3rd
[See the drawing], the sweep cylinder 13 is extended, and the pushing plate 11 moves to the forward rotation stroke C. At the same time, the counting of the count number N4 of the forward rotation stroke C is started [S19]. Count number N
The pushing plate 11 continues the forward rotation by following the path of the forward rotation stroke C until 4 exceeds 39. When the pushing plate 11 encounters the hard waste 34 during the normal rotation operation, a rapid pressure increase occurs in the piston side chamber 28 of the sweep cylinder 13. However, when the detected pressure Pc is lower than the inching pressure Pi (S21), that is, when the waste material 34 is relatively easily pressed and crushed, the normal rotation state is maintained,
The count number α in the meantime is added to N4, and N4 increases.

Here, as described above, the pushing plate 11 in the forward rotation stroke C is
The case where hard waste is not encountered or the pressure is low even if encountered is described.

When the count number N4 ≧ 39 of the forward rotation stroke C is satisfied [S20], the piston of the sweep cylinder 13 is located at the stroke end of the rod side chamber 27, and the forward rotation stroke C of the pushing plate 11 is completed.
N4 is added to the cumulative count number N0 [S22], and N4 is cleared [S23]. Then, the inching number flag X indicating the number of inching operations of the pushing plate 11 performed when the hard waste 34 is encountered during the simultaneous operation of the pushing plate 11 in the ascending stroke D is set to 0 [S24]. Further, according to the command signal from the operation command control means 29, the solenoid SbA is kept in the excited state while the solenoid SaA is excited [S2
5], as shown in FIG. 8 (d), the control valves 20a and 20b are both maintained and switched to the right port.

The push cylinder 14 extends, and the sweep cylinder 13 also extends. Here, as shown in FIG. 7 (b), counting of the dead zone count number N5 of the push cylinder 14 is started [S26]. That is, in the first simultaneous operation, the immobile state of the pushing plate 11 allowed based on the dead zone of the push cylinder 14 is set to 5 counts. When the count number N5 ≧ 5 [S27], N5 is added to the cumulative count N0 [S28], and N5 is cleared [S2
9]. After this immovable state, the pushing plate 11 enters the first simultaneous operation and rises, and the sweep cylinder 13
The pressing force is applied to the guide surface 7 by the extension of.
Then, the counting of the count number N6 in the simultaneous operation is started [S30]. In this example, the count number N6 is up to 10, which is the predetermined period of the first simultaneous operation.

When N6 has not reached 10 [S31], it is asked whether the pushing plate 11 encounters solid waste, that is, whether Pc ≧ Pi [S32], and if not, the count number N6. The count number α in the meantime is added to N6, and N6 increases. Then, when N6 ≧ 10 in step 31 as N6 increases, N6 is added to the cumulative count number N0 [S33] and N6 is cleared [S34]. Then, the solenoid SbA is demagnetized [S35], while the solenoid SaA is kept in the excited state, so that the push-in plate 11 starts the independent operation of only raising. The independent operation of the pushing plate 11 is an upward movement following a broken line Y1 [a broken line on the left side of the drawing] shown in FIG. 6 (a). Furthermore, the addition of the cumulative count N0 is started from the time of starting this independent operation [S36], and the count number 156 is reached until N0 reaches the position W2 at which the pushing stroke E [see FIG. 6 (a)] is started. Can be continued until.

When N0 ≧ 156, [S37], the pushing plate 11 reaches the position W2,
In addition to the energized solenoid SaA, the solenoid SbA is energized [S38]. By the excitation, as shown in FIG. 8 (d), the pushing plate 11 enters the pushing stroke E, and the cumulative count number N0 is added [S39] to reach the cycle start position W1 at which the pushing stroke E ends. Count up to 16
It is determined whether 6 has been reached [S40]. Count number N0 ≧
If it becomes 166, the solenoids SaA and SbA are both demagnetized [S4
1], the cumulative count number N0 is cleared [S42]. At that time, the pushing plate 11 has reached the cycle start position W1, and it is further asked whether or not to perform the next cycle [S43]. If it is necessary to perform the next cycle, FIG. 7 (a) Return to the start shown in. When the next cycle is not performed, the rotary solenoid Sry is demagnetized [S44]. An operation time chart of each solenoid in such an operation is represented as shown in FIG.

On the other hand, in step 32 shown in FIG.
When the 11 encounters the solid waste 34 and approaches the immobile state, the pressure increase generated in the hydraulic circuit is detected by the pressure sensor 33. If the detected pressure Pc is higher than the inching pressure Pi [S32], the seventh
As shown in FIG. 6C, the count number N6 is added to the previous cumulative count number N0 to store N0 at the time of boosting [S45],
The count number N6 is cleared [S46]. In this example, if the pressure sensor 33 detects the inching pressure Pi and it is maintained for one count, for example, the operation command control means 29 will issue a command signal to move to the next control. Therefore, the dust pushing control device is prevented from malfunctioning due to noise or the like.

As described above, since the pushing plate 11 performs the first inching operation, the flag X indicating the number of inchings is replaced with 0 from 1 [S47], and the counting of the count number N7 from that time point is started. [S48]. Even after the inching pressure is detected, the simultaneous operation is continued during the holding period, and is ended when N7 = 4 counts. This is because if the simultaneous operation of the sweep cylinder 13 and the push cylinder 14 is continued even after the inching pressure is detected, the waste 34 may be crushed. is there.
When the count number N7 ≧ 4 [S49], the cumulative count number N0
N7 is added to [S50] and N7 is cleared [S51]. Then, the solenoid SbA is demagnetized [S52], and the solenoid Sab
Since only the excited state of A is maintained, the pushing plate 11 starts the independent operation of only raising, and the counting of the count number N8 is started [S53]. Since the independent operation is set to 7 counts, when N8 reaches the count number 7 [S54], N8 is added to the cumulative count number N0 [S55] and N8 is cleared [S56].

If there is a boost in the first simultaneous operation, the second simultaneous operation is scheduled, so the solenoid SbA is excited [S57], and the energized state of the solenoid SaA is maintained. The operation shifts to the second simultaneous operation, and counting of the count number N9 in the predetermined period is started [S5
8]. Since the simultaneous operation is set to be allowed only for 10 counts, it is asked whether or not the number of inchings X = 2 before N9 exceeds 10 [S60]. Since the previous inching operation of the push-in plate 11 is performed only once, whether or not the hydraulic circuit is boosted in the second simultaneous operation, that is, whether Pc ≧ Pi or not is determined [S61]. If the pushing board 11 does not encounter solid waste, the count number α is added to N9 in step 58, and the presence or absence of boost detection is monitored until N9 ≧ 10 in step 59, and N9 ≧ without boosting. When it reaches 10, [S59],
N9 is added to the cumulative count N0 [S62], and N9 is cleared [S63]. Then, step 35 shown in FIG. 7 (b).
Return to step 43. At that time, the pushing plate 11 is the sixth
The broken line Y2 on the left side shown in FIG. 7A is traced and the position W2 is returned to the start position W1 of the cycle.

Next, in step 61 in FIG. 7 (c), Pc ≧
If it becomes Pi, that is, the pushing plate 11 is at the position shown in FIG. 6 (a).
When a hard waste is encountered at G2, the pushing board 11 is scheduled for the third simultaneous operation, and the inching frequency flag X
Is replaced by 2 [S64], N9 is added to the cumulative count number N0 [S65], and N9 is cleared [S66]. And
While returning to step 48 and proceeding to step 59, after performing the second independent operation, the third simultaneous operation is started.
Further, if it proceeds from step 59 to step 60, the flag X
Since it is 2, the routine always returns to step 58, and if N9 ≧ 10 at step 59, the procedure goes through steps 62 and 63 to the 7th step.
Return to step 35 in FIG. And step
Go to step 43, and if the next cycle is to be performed, return to step 1. If it does not proceed to the next cycle, it ends. 5 (b) shows the relationship between the cumulative count number N0 and each count number N1 to N9 when the pushing plate 11 performs the above-mentioned inching three times, and the operating states of both cylinders 13 and 14. Therefore, it is shown in the time chart.

By the way, in step 21 shown in FIG. 7 (a), if the pushing plate 11 in the forward rotation encounters a hard waste and Pc ≧ Pi,
Even if N4 ≧ 39 is not satisfied in step 20, the process immediately proceeds to step 22, and thereafter, the above-described steps are performed to operate. Sixth
As shown in Figure (a), the pushing plate 11 is in the middle of the forward stroke C H2.
The first simultaneous operation is performed from, but the operation follows the same route as when starting from the end position H1 of the forward rotation stroke C [see FIG. 5 (c)].

In the above description of the embodiment, the dust pushing control device,
The cycle motion mechanism 18 shown in FIG. 3 is adopted,
Instead, the different cycle motion mechanism 18 shown in FIG.
Even if A is used, the dust indentation control device operates similarly. This is a discharge pipe 19 in which the fluid pumps 17 and 17A are independently connected to the push cylinder 14 and the sweep cylinder 13, respectively, and the fluid pump 17A and the control valve 20b are connected to each other.
The only difference is that A is provided and a relief valve 32A and a pressure sensor 33A that are independent of it are attached.

In the above example, when the pushing plate 11 enters the ascending stroke D, the simultaneous operation is started immediately. However, first, only the ascending operation is performed, and then the first simultaneous operation may be performed. See FIG. 6 (b)]. Position in its first simultaneous actuation
If there is a sudden pressure increase at G1, the second simultaneous operation is performed, and if there is no sudden pressure increase at the position G1, the dashed line Y1 is followed and only the ascent continues. If there is a boost in the position G2 in the second simultaneous operation, the third simultaneous operation is performed, and if not, only the rise is performed along the broken line Y2. If the boost is detected during the third simultaneous operation, the fourth simultaneous operation is not performed if it is ignored. The sixth
When the push-in plate 11 in the figure (b) enters the ascending stroke D from H2 or the position H1 on the way, it passes through the dead zone of the count number N5 = 5, and then N8 =
After performing 7 independent operations, move to the first simultaneous operation. N6 ＝
If the pressure is increased by 3, N7 will be operated simultaneously until it reaches 4 counts, and then it will be operated independently. Also by this, the pushing plate 11 efficiently presses and crushes the solid waste 34, and the dust containing the crushed waste can be smoothly pushed into the dust storage box 1 (Figs. 5 (d) and 5). See FIG. (E)].

Further, in the above example, when the pushing plate 11 that has entered the first simultaneous operation encounters the hard waste 34, the encountered positions G1 to N7
= 4 counts, when the pushing plate 11 that has entered the second simultaneous operation encounters the solid waste 34, N7 = 4 counts from the encountered position G2 = 4 counts, and then each of the next primary upward independent operations. It is designed to move to. That N7 ＝
Instead of 4 counts, the operation may be shifted to the independent operation immediately after N7 = 0 counts, that is, immediately.

According to this, as shown in FIG. 6 (c) and FIG. 5 (f), the pushing plate 11 enters the first simultaneous operation from the end position H1 of the forward rotation stroke C, and the simultaneous operation is in the dead zone. The process continues until N6 = 10, which has been set via N5 = 5. However, if boosting is detected at N6 = 4, it will be a single operation of only a temporary rise immediately from N6 = 4. In this example, FIG. 7 (c)
In the flow chart in which steps 48 to 51 shown in FIG. 4 are omitted, when the first simultaneous operation starts from H2 in the middle of the forward rotation stroke C, the same operation as the first simultaneous operation from the end position H1 of the forward rotation stroke C described above is performed. A cycle movement is performed by following the path, and one cycle of movement becomes smooth.

In addition, after the boost detection in the first simultaneous operation, it was set
Instead of performing the single operation after N7 = 4 counts, the single operation may be performed after performing the simultaneous operation of N9 = 10 set as the predetermined period even when the boost detection is detected.
That is, the pushing plate 11 enters the first simultaneous operation from the end position H1 of the forward rotation stroke C, and as shown in FIGS. 6 (d) and 5 (g), the simultaneous operation is N5 = 5 in the dead zone. It is continued until N6 = 10 which was set via. Meanwhile, N6 in position G1
Even if boosting is detected at = 4, the simultaneous operation continues until N6 = 10, and then only the first rising operation is performed. continue,
Even if a boost is detected at N9 = 5 at the position G2 after shifting to the second simultaneous operation, the simultaneous operation up to N9 = 10 is continued. Even when the first simultaneous operation is started from H2 in the middle of the forward rotation stroke C, the cycle motion is performed by following the same route as in the case of entering the first simultaneous operation from the end position H1 of the forward rotation stroke C described above. Easy to control.

In the above-described cycle movement of the dust pushing device, the time required for each stroke operation is performed by integrating the count number based on the pump rotation from the proximity switch 31, but instead, each operation is time-controlled. Therefore, a timer may be used to integrate the time in steps 26 and 33 in FIG. 7B, for example. The same applies to the other steps, and even in that case, the dust pushing device can be smoothly operated to push hard waste into the dust storage box.

[Brief description of drawings]

FIG. 1 is a side view of the overall configuration of a dust pushing device in a dust truck, FIG. 2 is a schematic perspective view of a measuring unit for detecting a count number based on rotation of a fluid pump, and FIG. 3 is a configuration of a cycle motion mechanism. 4 and 5 are schematic configuration diagrams of the operation command control means, FIGS. 5 (a) to 5 (g) are operation time charts of solenoids for operating the sweep cylinder and the push cylinder, and FIGS. 6 (a) to 6 (d). 7A to 7C are explanatory views of the operating state of the pushing plate in the ascending stroke of the present embodiment.
Is a flow chart of the cycle motion by the dust pushing device of the present embodiment, and FIGS. 8 (a) to 8 (d) are the simultaneous movements in the ascending stroke in the cycle movement of the present embodiment, the single operation and the pushing stroke of each stroke including the pushing stroke. FIG. 9 is an operation state diagram of the plate, and FIG. 9 is a configuration diagram of a different cycle motion mechanism. 1 ... dust storage box, 3 ... packer, 10 ... slider, 11
…… Pushing plate, 13 …… Sweep cylinder, 14 …… Push cylinder, 29 …… Operation command control means, 34 …… Waste, A
…… Reverse stroke, B …… Descent stroke, C …… Normal rotation stroke, D ・ ・ ・
… Ascending stroke, H1 …… End position, H2 …… Midway.

Claims (4)

[Claims] 1. A slider mounted inside a packer continuously provided at the rear part of a dust storage box, moved up and down by a push cylinder, a pushing plate pivotally supported by the slider and reversing normally by a sweep cylinder, and the push. To control the cylinder and the sweep cylinder and to cause the pushing plate to perform a cycle motion consisting of a reverse stroke, a descending stroke, a forward stroke and an ascending stroke, in order to press and crush the waste thrown into the packer. After starting the ascending stroke from the end position of the forward rotation stroke in which the pushing plate is secondarily pressed, the sweep cylinder and the push cylinder are operated at the same time, and the operating oil pressure in the hydraulic circuit must rise rapidly during the simultaneous operation. For example, after the simultaneous operation for a predetermined period is finished, only the push cylinder is operated to raise the pushing plate, which is an independent operation. During the above-mentioned simultaneous operation, if the pushing plate encounters a solid waste and the hydraulic pressure in the hydraulic circuit suddenly rises, only the push cylinder is operated to temporarily raise the pushing plate after the simultaneous operation ends. A dust-pushing control device for a garbage truck, which is provided with an operation command control means for independently operating the sweep cylinder and the push cylinder simultaneously after the completion of the independent operation. 2. When a sudden increase in the operating oil pressure in the hydraulic circuit occurs during the simultaneous operation by the sweep cylinder and the push cylinder, the simultaneous operation is maintained until a predetermined holding period elapses from that point, and thereafter. The dust-pushing control device for the dust truck according to claim 1, further comprising: an operation command control unit that shifts to the single operation. 3. An operation of terminating simultaneous operation when a sudden increase in operating oil pressure occurs in the hydraulic circuit during the simultaneous operation of the sweep cylinder and the push cylinder, and thereafter shifting to the independent operation. The dust-pushing control device for the dust truck according to claim 1, further comprising command control means. 4. Even if a sudden increase in the operating hydraulic pressure in the hydraulic circuit occurs during the simultaneous operation by the sweep cylinder and the push cylinder, after the simultaneous operation for a predetermined period is completed,
The dust commanding control device for a dust truck according to claim 1, further comprising: an operation command control unit that shifts to the single operation.