JP4052969B2 - Waste discharge device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust discharge device.
[0002]
[Prior art]
When the dump switch for tilting operation is operated to discharge the dust from the dust storage box, the dust storage box tilts to the intermediate tilt angle and stops, and the dump switch tilts to the maximum tilt angle by re-operating the dump switch. Is described in Patent Document 1.
If the storage box is tilted at a stroke up to the maximum tilt angle without stopping at the intermediate tilt angle, the center of gravity of the vehicle will greatly move backward if there is a large amount of dust. However, like the invention described in Patent Document 1, by temporarily stopping at the intermediate tilt angle, a certain amount of dust discharge can be expected, and then the backward movement of the center of gravity can be suppressed even when tilted to the maximum tilt angle.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 6-30726 (page 1-3, FIG. 2)
[0004]
[Problems to be solved by the invention]
In the invention described in Patent Document 1, when the amount of dust loaded in the storage box is small, the tilt of the storage box stops in the middle as in the case of a large amount. However, when the amount of dust loaded is small, the backward movement of the center of gravity does not matter so much, and it is not necessary to stop tilting in the middle. In the invention described in Patent Document 1, even when it is not necessary to stop tilting in the middle, it is stopped uniformly, leading to a reduction in work efficiency.
Accordingly, an object of the present invention is to increase work efficiency when the amount of dust loaded is small in a dust discharge device that automatically stops in the middle of tilting of the storage box.
[0005]
[Means for Solving the Problems]
The present invention comprises a tilting drive means capable of tilting the dust storage box to a normal dump position where the tilt angle is maximum, and the dust storage box automatically stops at an intermediate position to the normal dump position during the tilting. In the dust discharge device whose tilting is resumed by the operation, when the dust loading amount of the dust storage box is less than a predetermined amount, the dust storage box is continuously tilted without being automatically stopped at the intermediate position. Control means for controlling is provided.
[0006]
According to the present invention, when the amount of dust loaded is large, automatic stop at the intermediate position is performed, so that the backward movement of the center of gravity can be suppressed, and when the amount of dust loaded is small, automatic stop at the intermediate position is performed. Work efficiency is good.
It is preferable that the small amount of the dust loading is detected by the magnitude of the driving force of the tilt driving means.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG.1 and FIG.2 has shown the refuse collection vehicle 1 provided with the dust discharge apparatus. A dust container 3 having an opening 2 on the rear surface is mounted on the body frame F of the garbage truck. The storage box 3 is pivotally supported at the rear end of the vehicle body frame F via a tilt shaft 4 provided at the rear of the vehicle body frame F so as to discharge dust, and the vehicle body frame F, the storage box 3, The tilting cylinder (hydraulic cylinder) C1 attached to can be tilted backward. The cylinder C1 constitutes a part of a dust discharge device, and the cylinder C1 tilts the storage box 3 up to a maximum tilt angle α (45 °) which is a normal dump position by extension.
[0008]
A dust input box 5 is provided at the rear end of the dust container 3 so as to cover the opening 2 of the dust container 3. The charging box 5 is provided with a rotating plate 11 and a pressing plate 12 for pressing the charged dust into the storage box. The rotating plate 11 is for lifting the dust thrown into the charging box 5 to the upper front from the storage chamber 7 at the bottom of the charging box 5. Further, the pushing plate 12 is for pushing the dust raised on the rotating plate 11 into the front side (in the storage box 3).
[0009]
The vehicle body frame F is provided with a proximity switch as position detecting means 9 for detecting that the container 3 being tilted has reached a predetermined intermediate position θ (intermediate tilt angle: about 37 °). The proximity switch 9 is disposed in the vicinity of the tilting shaft 4, and the container 3 has a predetermined tilt angle due to the approach of a dog (not shown) as a detected body provided on the container 3 side. Detect that. The proximity switch 9 is always ON when the tilting angle of the storage box 3 is equal to or greater than the predetermined intermediate position θ, and is OFF when it is smaller than the intermediate position θ.
[0010]
FIG. 3 shows a hydraulic circuit related to the tilt cylinder C1 which is the tilt drive means. The expansion / contraction switching of the cylinder C1 is performed by the electromagnetic valve 20. A pressure sensor 23 is provided in the middle of a path for supplying hydraulic pressure from the pump P to the cylinder C1, and detects the hydraulic pressure in the path. That is, the pressure sensor 23 which is a pressure detecting means can detect the operating pressure (driving force) of the cylinder C1.
[0011]
FIG. 4 shows a control block related to the dump controller 25 for controlling the operation of the cylinder C1. The control device 25 is connected to the position detection means 9 and the pressure detection means 23, and outputs from the position detection means 9 and the pressure detection means 23 are given to the control device 25. In addition, a dump switch 26 is disposed in the driver's seat of the garbage truck 1, and when the dump switch 26 is operated, a command is given to the control device 25 which is a control means for tilting, and the container 3 is tilted. Is called. As shown in FIG. 1, the dump switch 26 can select either dumping or dumping. When the dumping is selected, the dump switch 26 tilts upward, and when selecting dumping, the dumping switch 26 tilts downward.
[0012]
FIG. 5 shows a flowchart of dump control. When “top dumping” is selected by the dump switch 26 as the operation means (step S1), the cylinder C1 is extended (step S3), and the container box 3 starts to tilt. Step S2 will be described later.
[0013]
When tilting starts, the pressure sensor 23 detects the hydraulic pressure, that is, the operating pressure of the cylinder C1 (step S4). If the pressure value immediately after the start of expansion is equal to or greater than the predetermined value (50 kg / cm ² ) (step S5), when the proximity switch 9 is turned on (step S6), the cylinder C1 is stopped (step S7). When the detected pressure value of the pressure sensor 23 is 50 kg / cm ² or more, it can be evaluated that there is a dust loading amount of about 25% or more when the storage box is fully loaded. When the amount of dust is so large, if the container 3 is tilted at once to the maximum tilt angle (regular dump position) α, the center of gravity may move backward and become unstable. When the angle reaches a predetermined intermediate position θ (intermediate tilt angle; approximately 37 °), the tilt is automatically stopped.
[0014]
After “automatic stop” is performed, when “on dump” is selected again by the dump switch 26 as the operation means (step S1), the proximity switch 9 is always ON in this state, so the steps S2 to S8 are performed. Migrate to In step S8, the timer means T counts for a predetermined time (2 seconds) (steps S8 to S10). When a predetermined time (2 seconds) elapses from the operation, the expansion of the cylinder C1 is resumed (step S11).
When the extension of the cylinder is resumed, the storage box 3 can be tilted to the normal dump position having the maximum tilt angle α, and when the “on dump” selection is canceled by the dump switch 26 (step S12), the operation of the cylinder C1 is performed. Stop.
[0015]
On the other hand, if the pressure value detected by the pressure sensor 23 is smaller than 50 kg / cm ² in step S5, the cylinder C1 continues to expand regardless of whether the proximity switch 9 is turned on or off, and stops at the intermediate position θ. It is possible to tilt to the normal dump position without any change (step S13). When the detected pressure value of the pressure sensor 23 is less than 50 kg / cm ^2, the dust loading amount can be evaluated as less than approximately 25% of the container box full. When the amount of dust is so small, the rearward movement of the center of gravity by tilting hardly causes a problem even if the storage box 3 is tilted at once to the maximum tilt angle. Therefore, when the amount of dust is small, by quickly tilting the storage box, the time loss for the temporary stop at the intermediate position θ can be eliminated, and dust discharge efficiency is increased.
[0016]
By omitting the temporary stop at the intermediate position θ, the time loss that can be eliminated is several seconds. However, there is a desire to make it as early as 0.5 seconds at the work site. Is obtained.
The present invention is not limited to the above embodiment. For example, the detection of the intermediate position θ may be changed to a proximity switch, and an angle sensor that detects the rotation angle of the shaft 4 may be used. Further, the dust loading amount may be detected by detecting the weight of the storage box 3.
[0017]
【The invention's effect】
According to the present invention, when the amount of dust loaded is large, automatic stop at the intermediate position is performed, so that the backward movement of the center of gravity can be suppressed, and when the amount of dust loaded is small, automatic stop at the intermediate position is performed. Work efficiency is good.
[Brief description of the drawings]
FIG. 1 is a side view of a garbage truck.
FIG. 2 is a side view of a dust collection vehicle in which a dust storage box is tilted.
FIG. 3 is a hydraulic circuit of the dust discharge device.
FIG. 4 is a control block diagram of the dust discharge device.
FIG. 5 is a flowchart of a dust discharge process.
[Explanation of symbols]
1 Garbage truck 3 Garbage storage box 9 Proximity switch (position detection means)
23 Pressure sensor (pressure detection means)
25 Control device (control means)
26 Dump switch (operating means)
θ Intermediate position (37 °)
α Regular dump position (45 °)
C1 Tilt cylinder (Tilt drive means)

Claims (2)

Tilt drive means capable of tilting the refuse storage box to the normal dump position where the tilt angle is maximum, the dust storage box automatically stops at an intermediate position to the normal dump position during tilting, and tilted by operation In the refuse discharge device where
When the dust storage amount of the dust storage box is less than a predetermined amount, it is provided with control means for controlling the tilting of the dust storage box to continue without stopping automatically at the intermediate position. A dust discharge device. 2. The dust discharge device according to claim 1, wherein a small amount of the dust load is detected based on a driving force of the tilt driving means.

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