JPH0233002A - Garbage press-in control device for garbage truck - Google Patents

Abstract

PURPOSE:To stably attain operation of a fluid pump or the like for a long period by once continuing a pressing stroke further from a position of suddenly increasing a pressure of working fluid in a sliding cylinder so as to be transferred thereafter to a retracting stroke next again to a down stroke, in case of the captioned device of a packer successively provided in line with a garbage truck. CONSTITUTION:A press-plate 11, during its primary pressing, hits a hard waste 34, when a pressure of working fluid in a sliding cylinder 14 suddenly increases, a pressing stroke Ba is further maintained temporarily from that position G, and partly lifting the press-plate 11 by the sliding cylinder 14 from a position H of ending the stroke Ba further temporarily normally rotating the plate 11 by a press-plate cylinder 13, a retracting stroke Bc1 is performed. And the plate 11 is stopped after the predetermined time. Next again by actuating the sliding cylinder 14, the press-plate 11 performs a down stroke B. By this constitution, a fluid pump or the like enables its operation to be stably attained for a long period.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a garbage pushing control device for a garbage truck, and in detail,
A garbage pushing device is attached to a packer connected to a garbage storage box of a garbage truck that collects garbage, and the pushing plate performs a cyclic movement that involves lifting and reversing, and stores garbage in the garbage storage box. The present invention relates to a garbage pushing control device that can perform the following tasks.

[Conventional technology]

To control the cyclic motion mechanism of the push plate in a garbage collection vehicle, a sensing device such as a cam or a limit switch is connected to the movable part of the mechanism, and the cyclic motion control device is activated by this sensing device. There is. In this control device, since the sensing device is in contact with the moving parts, it is prone to wear and the cycle movement may be disrupted, and the structure requires a large number of sensing devices, resulting in frequent failures and poor durability. There are some drawbacks.

As a solution to this problem, the
There is a cycle motion control device described in Japanese Patent No. 5.

This is done by attaching a proximity plate to the drive shaft of the fluid pump.
A sensing device is disposed opposite the proximity plate. Then, each time the proximity plate approaches the sensing device as the fluid pump rotates, a change is given to the high frequency signal emitted from the sensing device, thereby making it possible to extract the rotational speed of the fluid pump. There is. A control device that receives a high frequency signal from a sensing device is used to control the cyclic motion of the pushing plate, and the sensing device measures the rotational speed of the fluid pump and matches it with the set rotational speed set in advance in the control device. Control is performed by comparing the rotational speed with the measured number of rotations, and the pushing plate undergoes cyclic motion consisting of respective predetermined strokes, such as reversing, descending, normal rotation, and upward strokes. At this time, the garbage thrown into the bunker is mainly compressed during the downward stroke and normal rotation stroke of the pushing plate, and is smoothly stored in the garbage storage box during the upward stroke.

[Problem to be solved by the invention]

In recent years, the garbage that is thrown into the garbage truck is often thick (hard) waste such as electric washing machines and electric refrigerators. Since it is not designed to perform any special movement to effectively crush the hard waste that has been thrown in, there is a problem that it is difficult to efficiently store the hard waste into the garbage storage box.

Furthermore, in the cyclic movement of the pusher plate controlled by the above-mentioned control device, when the pusher plate, which descends or rotates forward, encounters hard waste and stops, the fluid pressure increases and the releaser valve operates. I will do it. The push plate is designed to proceed to the next stroke after the completion of a count based on the rotation of the fluid pump corresponding to the entire stroke of each stroke, which is preset in the control device, or after the elapse of a predetermined time. Since the hydraulic circuit that operates cylinders and the like is held in a high pressure state for a long time, problems such as adversely affecting the life of the fluid pump occur.

The present invention was made in view of the above problems, and its purpose is to crush the hard waste thrown into the packer of a garbage truck by sequentially pressing various parts with a pusher plate, thereby efficiently disposing of the garbage. Garbage from a garbage truck can be pushed into a storage box, and the hydraulic equipment such as the cylinder that operates the push plate will not maintain a high pressure state for a long time, allowing fluid pumps and cylinders to operate stably over a long period of time. An object of the present invention is to provide a pushing control device.

[Means to solve the problem]

As shown in FIG. 1, the present invention includes a slider 10 that is mounted inside a bunker 3 that is connected to the rear of a garbage storage box 1 and is moved up and down by a slide cylinder 14, and a slider 10 that is moved up and down by a slide cylinder 14.
This device is commonly used in a garbage pushing control device that controls the pushing plate 11 which is pivoted at 0 and rotates forward and reverse by the pushing plate cylinder I3, the slide cylinder 14 and the pushing plate cylinder 13, and causes the pushing plate 11 to perform cycle motion. be done.

The feature is that by pressing the hard waste 34 in the downward stroke B in which the pushing plate 11 presses the waste 34 [see Fig. 6(a)] put into the bunker 3, the sliding cylinder 14, the push plate 11 is moved to the pressing stroke Ba in which it temporarily presses in the primary press direction, and the pressing stroke Ba in which the working hydraulic pressure has increased is ended. Then, the descending stroke B of the pushing plate 11 is partially raised from the end position H of the pressing stroke Ba, and at the same time, the retracting stroke Bcl is performed in which the pushing plate 11 is temporarily rotated in the normal direction, and then the descending stroke B is started again for primary pressing. The operation command means 29 [
(See Figure 3).

[For production]

The garbage pushing device installed inside the bunker 3 connected to the rear of the garbage storage box 1 is operated by a command signal from the operation command means 29. That is, the pushing plate 11 pivotally supported by the slider 10 is reversed by the operation of the pushing plate cylinder 13, and takes a reversing stroke A, which is the first stroke of the cycle motion. Waste material 34 such as garbage is put into the packer 3, and the pressing plate 11 enters a downward stroke B by the operation of the sliding cylinder 14, and the garbage is primarily pressed as the pressing plate 11 descends. Push plate 11
encounters hard waste 34, the sliding cylinder 1
There is a sudden increase in the hydraulic pressure within 4. At this time, the lowering of the pusher plate 11 is prevented, but from the position G where the working oil pressure suddenly increases, the lowering operation of the pusher plate 11 is further temporarily continued in a pressing stroke Ba. That-
When the temporary pressing ends, the push plate 11 partially ascends the downward stroke B from the end position H of the push stroke Ba by the operation of the slide cylinder 14, and at the same time, by the operation of the push plate cylinder 13, −Temporally forward rotation.

That is, the pushing plate 11 moves in the direction of combination of partial elevation and temporary normal rotation in the retraction stroke Bcl (Fig. 6(a)
)] and continues until a predetermined period of time has elapsed, then stops. By operating the slide cylinder 14 again, the pushing plate 11 enters the downward stroke B and descends, thereby primarily pressing a different part of the hard waste material 34 or a part where no waste material exists. This operation is repeated one after another, and the pushing plate 11
The hard waste material 34 can be efficiently pressed and crushed at different locations. When the inching operation including a predetermined number of pressing strokes is completed, the pushing plate 11 proceeds to the remaining normal rotation stroke C, and smoothly stores the crushed waste 34 in the garbage storage box 1 one after another.

〔Effect of the invention〕

According to the present invention, the command signal from the operation command means shortens the pressing time while the pushing plate encounters hard waste in the downward stroke of the cycle motion, and the fluid generated if the high pressure state continues. Deterioration in the durability of hydraulic equipment such as pumps and cylinders can be avoided. In addition, in the downward stroke, the pushing plate presses different locations one after another, so that the crushing of the garbage and waste is promoted and the pushing into the garbage storage box becomes smooth.

〔Example〕

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

As shown in FIG. 1, a bunker 3 is rotatably connected to the rear upper end of the garbage storage box 1 placed on the frame of a garbage truck by a hinge pin 2, and when the bunker 3 is lowered, An opening 4 formed in this bunker 3 communicates with the inside of the garbage storage box l. The bunker 3 has an input port 5 formed in its rear part, and the bottom part continuous with the input port 5 has a downwardly recessed arc-shaped compression surface 6, which rises obliquely upward toward the garbage storage box l, and has the above-mentioned opening. A guide surface 7 continuous to the portion 4 is formed.

A garbage pushing device for compressing garbage and pushing it into the garbage storage box 1 is housed in the bunker 3.

The dust pushing mechanism and the device that controls the mechanism will be described in detail below. Guide grooves 8 are formed in both side walls of the packer 3 from the upper front to the lower rear, and the guide grooves 8 have a pair of left and right sliders l having a pair of guide rollers 9a and 9b.
O is slidably supported. A push plate 11 is swingably supported between the lower ends of both sliders 10 by a pivot 12, and a bracket lla protruding from the back of the push plate 11 and the upper end of the slider lO are connected to the push plate 11 in the forward and reverse directions. Both ends of the pushing plate cylinder 13 for swinging in the direction are pivotally supported. Both ends of a slide cylinder 14 for moving the slider 1o up and down along the guide groove 8 are pivotally supported at the middle of the slider 10 and the lower end of the bunker 3.

Therefore, by sequentially controlling the slide cylinder 14 and the pushing plate cylinder 13, for example, the pushing plate 11 is subjected to a reversing stroke A, a primary pressing downward stroke B, and a secondary pressing as shown by the two-dot chain line. It is possible to perform a cyclic motion consisting of four strokes: a normal rotation stroke C and an upward stroke.

2 to 4 show a cycle motion device for causing the pusher 11 to perform cycle motion. In FIG. 2, a fluid pump 17 is connected to the rotary wheel 16 of the power take-off device 15 connected to the running engine of the garbage truck, and the hydraulic oil discharged from the fluid pump 17 causes
The cycle motion mechanism 18 shown in FIG. 3 is operated.

The structure of the cycle motion mechanism 18 will be explained based on FIG. The discharge pipe 19 of the fluid pump 17 is connected to a control valve 20a, and is further connected to the other control valve 20 via a communication pipe 19a.
connected to b. Control valve 20a is connected to rod side chamber 23 and piston side chamber 24 of sliding cylinder 14 via conduit 21.22, control valve 20b is connected to conduit 25.
It is connected to the rod side chamber 27 and the piston side chamber 28 of the pushing plate cylinder 13 via 26. Control valve 2・Oa
has solenoids SaB, SaA to switch it to the left port or right port, and also the control valve 20
b has a solenoid Sb for switching it left and right.
These solenoids SaA, SaB, SbA, and SbB switch the ports of the control valves 20a and 20b that are sequentially activated during the - cycle in response to a command signal from an operation command means 29, which will be described later, to control the slide operation. Controls the operations of the cylinder 14 and the push plate cylinder 13. Further, the discharge pipe 19 includes a relief valve 32 that opens when the pressure increases to the relief pressure and returns the hydraulic oil to the tank, and a relief valve 32 that detects whether or not the pressure has increased above the inching pressure Pi, which is set at a pressure lower than the relief pressure. A pressure sensor 33 is attached.

For example, an inverted-shaped proximity plate 30 is fixed to the rotating shaft 16 of the fluid pump 17 shown in FIG. There is. Note that the number of proximity plates 30 is not limited to one, and although not shown in the drawings, for example, a plurality of proximity plates 30 may be arranged on the circumference. When the proximity plate 30 approaches the sensing device 31, which is a proximity switch, due to the rotation of the rotating shaft 16, a change is given to the high frequency signal being emitted from the proximity switch 31, thereby changing the rotation speed of the fluid pump 17 into a high frequency signal. It can be extracted as

The operation command means 29, which receives the high frequency signal transmitted from the proximity switch 31, measures the actual rotation speed of the fluid pump 17 and compares the measured rotation speed with a preset rotation speed, that is, the fluid Based on the rotation of the pump 17 (
Whenever the count number matches or exceeds the set count number, the control valve 20a of the cycle movement mechanism 18,
20b to issue a command.

FIG. 4 shows a schematic configuration of the operation command means 29.

This is, for example, a microcomputer, which includes a fixed storage section, a write-in storage section, a central processing unit, etc. (not shown). Its function is the downward stroke B in which the pushing plate 11 presses the waste thrown into the packer 3 [Fig. 6 (a)].
By pressing the hard waste material in [Reference], the working pressure inside the slide cylinder 14 suddenly increases. When the pressing stroke Ba in which the working oil pressure is increased is completed, the lowering stroke B of the pushing plate 11 is partially raised from the position H, and at the same time a retreating stroke Bcl is performed in which the pushing plate 11 is temporarily rotated in the forward direction. Thereafter, the process moves to a downward stroke B in which primary pressing is performed again.

Its specific configuration includes a counting circuit, an output circuit Q, and an output holding circuit M. The counting circuit is a sensing device 31
The number of revolutions, that is, the number of counts of the fluid pump 17 is measured by the binary method by receiving the high frequency signal transmitted from the controller. When the actual rotational speed of the fluid pump 17 measured by the counting circuit reaches or exceeds a preset set rotational speed, that is, a set count number, the output circuit Q activates the output holding circuit M.
It is now the turn to emit an output signal. The output holding surface 1aM is connected to the control valve 20 based on the signal from the output circuit Q.
Solenoid SaA, S for switching a, 20b
In addition to exciting or demagnetizing aB, SbA, and SbB, in order to generate discharge pressure in the fluid pump 17, the rotary solenoid Sry, which starts increasing the rotational speed of the engine in an idling state, is also excited or demagnetized.

Note that the output circuit Q also has a function of resetting the count number measured by the counting circuit to O when each count number, which will be described later, reaches a set maximum value.

In this example, if the pushing plate 11 takes a cyclical motion consisting of four strokes A-D of reversing, descending, normal rotation, and ascending, and no hard waste is pressed during this period, as shown in FIG.
As shown in a), the count number No. is accumulated to complete the cycle. For example, in the downward stroke B, the slide cylinder 14 is contracted by energizing the solenoid SaB, but the setting is such that the period continues for a period corresponding to the cumulative count number 38, from 27 to 64. . Note that, as will be described later, while the electric signal circulates once through the control system, the fluid pump 17
A count number α based on the rotation of is added. Since this count number α depends on the rotational state of the fluid pump 17,
It is not always the same value, and it will be a different value each time - boat fishing.

In the present invention, in this downward stroke B, the pushing plate 1
1 encounters hard waste and its pressure increases the hydraulic pressure to the slide cylinder 14 (see Figure 3) to a level higher than the set inching pressure Pi, the push plate 11 is moved further downward from the position G. to press. During this time, the pressing is continued until a predetermined count is reached, and then the pushing plate 11 is evacuated from the reached position H, and moved to a crushable part of the waste in order to press the hard waste again at a different position. This allows the pushing plate 11 to be displaced. Incidentally, when the inching pressure Pi occurs, in most cases the hydraulic fluid immediately reaches the relief pressure Pj, but only for a short period of time during the pressing stroke Ba, which is maintained only for a predetermined number of counts, and the fluid pump 17 and cylinder 14 It has no influence on love.

Here, the operation that constitutes the main part of the present invention will be explained more clearly. In FIG. 6(a), the pushing plate 1 shown by the two-dot chain line
1 is lowered toward the waste material 34 in the direction of arrow 35, that is, as a primary press. If the waste is solid and cannot be crushed, the sliding cylinder 14 is
The pressure in the rod side chamber 23 increases. When the pressure PC detected by the pressure sensor 33 reaches the inching pressure Pi, counting of the count number N4 is started at that point. The supply of hydraulic oil to the slide cylinder 14 is continued until the count reaches 7, for example. At this time,
Since the waste material 34 is harder than the position G, the pushing plate 11 either does not move any further or takes a pushing stroke Ba in which it is crushed a little. In order to facilitate visual understanding, if the pushing plate 11 is further lowered in the direction of the arrow 36, this continues until the count number 7 described above. When the count reaches 7, the pressing stroke Ba is completed, and the control valve 2 is closed at the position H.
The port 0a is switched, and a separate count (N5 to be described later) is started from that point. Hydraulic oil is supplied to the piston side chamber 24 of the slide cylinder 14 until the count reaches 12, for example. At the same time, the boat of the control valve 20b that was in the neutral position is also switched, and hydraulic oil is supplied to the piston side chamber 28 of the push plate cylinder 13 for the same period of time. Therefore, the pushing plate 11 moves in the retraction stroke Bcl in the direction of arrow 37, which is a combination of the partial rise of the downward stroke B and the temporary forward rotation following the first order of the forward rotation stroke C. There is. By the way, during the count of N5 mentioned above, the count N as the amount of temporary forward rotation
6 is converted from count N5. This count of N6 is for calculating the remaining normal rotation after repeating the temporary normal rotation several times. For example, it is determined by the cross-sectional area ratio of the piston side chamber and the rod side chamber of both cylinders 13 and 14, and that ratio For ε, it is converted as N6 = N5 x ε. That is, if ε is 0.6, when N5 reaches the predetermined count of 12, as shown in FIG. 6(a), N6 =
7 (12X0.6 = 7.2, but the integer that is less than 1 count is rounded down).

By moving this evacuation stroke Bcl, push #i!
ll is separated from the waste material 34 in the direction of the arrow 37. At that time, the pressure Pc detected by the pressure sensor 33 is the inching pressure P
Needless to say, it will be lower than i. When the count of N5 reaches 12, the extending operation of the slide cylinder 14 and the push plate cylinder 13 is stopped. Push plate 1
After the first stop, the slide cylinder 14 is contracted again, so that the above-mentioned inching operation is repeated a preset number of times as shown in FIGS. 5(b) and 6(b).

The garbage truck pushing control device configured as described above can crush the thrown-in waste 34 by operating the cycle including the downward stroke B as follows.

As shown in the flowcharts of FIGS. 7(a) to (g),
When the pushing start command button (not shown) of the garbage pushing device in the garbage truck is pressed [Sl], a start signal is input to the operation command means 29, and the pushing plate 1 of the garbage pushing device is pressed.
Flag F1 indicating each stroke operation during cycle movement of 1 is 1.
．． F2. F3, F4 and F5 are each set to O [S2].

It is determined whether Fl = 0 or not (S3), Fl = 1 is confirmed in step 4, and all counts are reset to O in the operation command means 29. That is, Nl
=0. N2 = O..., N8 = O, and X indicating the number of inching operations of the push plate 11 performed when hard waste material 34 is encountered is set to O [S5]. Next, the flag F1 set to 1 in step 2 is replaced with 2, and the flag F2 set to 0 is replaced with 1 (N6). Subsequently, it is determined whether F2=1 or not [S7]. By the way, the flag F2 takes one of 1 to 5, and when F2=1, the engine speed is increased to the idle up stroke ■, when F2=2, the push plate 11 is reversed to the reverse stroke A, and when F2=3, it goes to the reversing stroke A where the push plate 11 is reversed. To the descending stroke B for the first press,
When F2=4, it is possible to proceed to a normal rotation stroke C that performs a secondary press, and when F2=5, it is possible to proceed to an upward stroke that includes a pushing stroke E.

As shown in FIG. 7(b), by setting the flag F2-1, the garbage pushing device enters the idle up stroke ■, the count number N1 in that stroke is measured, and the rotary solenoid (not shown) is energized. S8], the rotational speed of the idling engine is increased in order to generate discharge pressure in the fluid pump 17. That is, the power extraction device 15 (see Fig. 2) of the garbage truck extracts a large amount of power from the engine, the power is supplied to the fluid pump 17 via the rotating shaft 16, and after a predetermined period of time, the fluid pump 17 reaches the specified rotation speed. As described above, each time the proximity plate 30 rotating in front 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. .

Now, since it is just after the start of counting and N1≧3 is not satisfied [S9], each time a count signal corresponding to the rotation of the fluid pump 17 is detected by the proximity switch 31, the count number α is added to the count Nl (SIO ), Figure 7 (
Return to step 3 of a>. Note that Nl = N1 + α is set in step 1O because the number of rotations of the rotating shaft 16 during the circulation of the electric signal is not necessarily the same each time, so the detected count number is added as α. What we are doing is as stated above. That is, α may be 1, or may be 0 or 3. Since Fl is replaced with 2 and F2 is replaced with 1 in step 6, the process moves from step 4 to step 7 via step 11.

Step 7 leads to step 9, and the addition of count N1 [S10] is repeated, and if Nl≧3 [S9],
Flag F2 is set to 2 [S12], and 'step 3
be returned to. Then follow step 7 and step 1
3 to step 14 in FIG. 7(c). During the above period, the fluid pump 17 enters steady operation and is in a state where it can discharge hydraulic oil at a predetermined pressure. Then, the pushing plate 11 enters the reversing stroke A, which is the first stroke. That is, step 4
, 117, and in step 13, F2=2 is confirmed.

Then, only the solenoid SbB (see Fig. 3) is energized, the push plate 11 enters the reverse stroke, and the count N2 starts counting during that time.Solenoid Sb
By excitation of B (514), the control valve 20b shown in FIG.
is switched to the left boat, and the hydraulic oil from the fluid pump 17 is supplied to the rod side chamber 27 of the push plate cylinder 13 (see FIG. 3).

As shown in FIG. 8(a), the pushing slope cylinder 13 is reduced, and the pushing plate 11 is reversed in the direction away from the garbage storage box 1 to be in a substantially horizontal state. In this state, garbage and waste are introduced into the bunker 3 from the inlet 5.

Since N2 is counted at the same time as the pushing plate 11 starts to be reversed, it continues until the count reaches 23, which ends the reverse process A. Specifically, if it is determined in step 15 that the count number N2 is not 23, which is set in advance, α is added to the count number N2 every time the proximity switch 31 detects rotation of the fluid pump 17 (346 )
. Then it returns to step 3 and steps 4.11.7
．． 13. The process moves to step 15 via step 14, and the number of currents 1-N2 is increased in the same manner. Such an operation is repeated, and in step 15, N2≧23
If it is determined that the flag F2 is 2, the flag F2 is replaced with 3 (S17). As a result, a transition is made to the descending stroke B as the primary press of the next stroke.

In this example, when the pushing plate 11 collides with the hard waste 34 [see Fig. 6 (a>)] during the downward stroke B and performs an inching operation, the partial upward movement of the downward stroke B is performed as necessary. and,
A retraction stroke Bcl is performed in which the pushing plate 11 moves in a direction that is a combination of the temporary normal rotation that follows the first order of the normal rotation stroke C.

However, for the time being, the case where the waste 34 is soft and crushable will be explained. Since F2=3 has been replaced, go back to step 3, and from step 4 to step 11.7. 13 and then moved to step 18,
It is confirmed that flag F2 is 3. Figure 7(d)
As shown in , first, the solenoid SbB is demagnetized (
319) Meanwhile, the demagnetized state of solenoids SbA and SaA is also maintained (520).

Subsequently, it is determined whether the flag F3 is 0 or not [S21],
Since F3 is set to O in step 2, solenoid S
aB (see Figure 3) is excited (S22), the slide cylinder 14 contracts, and the push plate 11 starts to descend.As shown in Figure 8(b), the slide cylinder 14
, the slider 10 is moved along the guide groove 8 together with the pushing plate 11.

Here, measurement of the count number N3 for controlling the descending stroke B is started. If the waste material 34 is soft or easily crushed by pressure, the pressure Pc of the hydraulic fluid in the slide cylinder 14 will not become very high. Therefore, the pressure P detected by the pressure sensor 33
If c is lower than the inching pressure Pi [S23], N4 indicating the count number of the pressing stroke Ba remains O (S24), and the process proceeds to step 25, where the state of flag F3=0 is maintained [
S25], it is determined whether the count number N3 after the push plate 11 transitions to the downward stroke B has reached 38 (
326). Count number N with signal from proximity switch 31
The count number α during that time is added to 3 [S27], and the process returns to step 3. Then, the count number N3 is increased while following the same route.

In this way, if N3≧38 in step 26, flag F2, which is set to 3, is replaced with 4 (S28). Then go back to step 3 and step? , 11.13.18 to reach step 29.

As a result, the operation command means 29 issues a command to move to the next stroke, the normal rotation stroke C for secondary pressing.

That is, as in the seventh ffl (f), the solenoid Sa
B is demagnetized [S45], solenoid SbA is energized (348), and the control valve 20a is set to neutral.
Switch b to the right port [see Figure 8(d)]. In this way, the pushing plate 11 moves to the forward rotation stroke C.

Next, if the waste material 34 is hard to be crushed and the pushing plate 11 cannot continuously move up to the count number N3 of 38 in the descending stroke B of the primary pressing, that is, the operation which is the core of the present invention is Let me explain the case.

If the pushing plate 11 encounters the thrown-in hard waste material 34 when the count number N3 is 22 and the waste material 34 is not crushed, the pressure in the rod side chamber 23 (see Figure 3) of the slide cylinder 14 increases. . At this time, the pushing plate 11 enters the pushing stroke Ba, but the excitation of the solenoid SaB is maintained (S22).

This pressure increase increases the relief pressure, e.g. 160 kg/ci.
For example, 155 by the pressure sensor 33 before reaching .
It is detected as the inching pressure Pi in kg/ca.

In this way, when the detected pressure Pc becomes larger than Pi (S23), the inching operation starts from the position G [see FIG. 6(a)].

Since inching is now about to start, the number of inching times is not X≧3 and the process does not proceed from steps 25 to 27. Therefore, at this point, the measurement of the count number N3 of the descending stroke B is temporarily stopped at a count of 22. Then, at the start of this inching operation, the pushing plate 11 presses the hard waste material 34 and enters a pushing stroke Ba in which it comes to a halt or further descends slightly. On the other hand, the pressing stroke Ba
Counting of the time count N4 between O is started, and α is added to N4 based on the rotation of the fluid pump 17 (331). Next, it is asked whether the count number N4 has reached 7 [S32], and since the measurement has just started, N4 is smaller than 7, and the process returns to step 3 and thereafter steps 4, 11, 7, and 13. , 18, N4 is increased in step 31 shown in FIG. 7(d), and the process proceeds to step 32. Since the number N4 has not yet reached 7, the same electrical signal circulation as described above is repeated until the count number N4 reaches 7. If it is determined in step 32 that N4≧7, the push plate 11 moves to its position H [th]. 6 (see Figure 6 (a)), or is held in a stopped state due to an encounter, and has already reached N4≧
The count number which is 7 is reset to O (S3
3).

Since the pressing stroke Ba of the first half of the inching operation was performed in this way, the number of inching times
1 is added to (S34), and it is further asked whether X≧3 (S35). And since X=1,
F3, which was set to O in step 2, is set to 1 (S3
6). Return to step 3 and step 4. 11.7.
After 13.18, it is determined in step 21 that F3 is not O, F3=1 is confirmed [S37], and the pushing plate 11 enters the retraction stroke Bcl.

As shown in FIG. 7(-8), the solenoid SaA and the solenoid SbA are energized simultaneously, and the control valve 20a whose left port was open is switched to the right port, while the control valve 20b which was in the neutral position. can also be switched to the right port. The hydraulic oil from the fluid pump 17 is as shown in Fig. 8 (C
), the piston is supplied to the piston side chamber 24 (see FIG. 3) of the slide cylinder 14, whereby the slide cylinder 14 expands and pushes the slider 10 into the plate 11.
along the guide groove 8. The return oil of the slide cylinder 14 is supplied to the piston side chamber 28 (see Figure 3) of the push plate cylinder 13, which causes the push plate cylinder 13 to expand and temporarily rotate the push plate 13 in the normal direction. It works like this.

As a result, the pushing plate 11 moves in a retracting stroke Bcl (see FIG. 6(a)) in which the pushing plate 11 moves in a combination of a partial rise in the descending stroke B and a temporary forward rotation that follows the first order of the forward rotation stroke C. At this time, counting of N5 is started, and if N5 has not reached 12 to end the evacuation (339), α based on the rotation of the fluid pump 17 is added to the count number N5 (
340). Then go back to step 3 and step 3 again
7 [see FIG. 7(d)], and in step 40,
α is further added to N5 (S40).

In this way, when N5≧12 is reached (339), the retracting operation of the push plate 11 is completed, and the count number N6 of forward rotation in - time is calculated (S41). As mentioned above, N6 is set to 7 [see FIG. 6(a)], and the flag F3, which is set to 1, is replaced with O" (S
42). Here, the above N6 is added to the count number N7 in the normal rotation stroke C, which is O (S43)
. That is, N7=7 [see FIG. 6(b)].

In addition, N5 and N6, which have become 12 and 7, are reset to O [S44], and the process returns to step 3, where FIG.
), the solenoids SbA, SaA
is demagnetized, and step 21 is reached. Since the flag F3 is set to O in step 42, the solenoid SaB is energized [S22], and furthermore, in step 23, the hydraulic pressure to the slide cylinder I4 exceeds the inching pressure Pi during the primary press currently being performed. If there is no pressure increase, the process goes from steps 24 to 27, and the N3 count, which was stopped when the inching operation was started, is restarted. Then, the process returns to step 3 and continues until the count number of the primary press stroke reaches 38.

If the working oil pressure exceeds the inching pressure Pi again during that time (
S23), the above-mentioned inching operation, that is, step 3
1 and reaches step 33, where X is already 1.
1 is added to (334). After that, perform the inching operation as explained above, and when it is completed, step 3
be returned to. As described above, the addition of N3 is also stopped during this second inching operation. And the sixth
As shown in FIG. 5(b), in this example, the inching operation is performed up to three times [see FIG. 5(b)], so if X≧3 is confirmed in step 35, the process proceeds to step 25, and The addition in step 27 is repeated until N3≧38 is satisfied in step 26 through step 26. Even if the inching pressure Pi is detected by the pressure sensor 33 during this time, it is ignored in step 30, and the addition of N3 is continued in step 27. If N3≧38, [826
], F2 is set to 4 in step 28, and step 3
, and the pushing plate 11 does not descend any further.

As mentioned above, when the inching operation is performed three times, the count number N7 in the normal rotation stroke C is 21 [see FIG. 6(b)], and when the inching operation is performed twice, it is 14. Of course, it goes without saying that the value is 0 if the inching operation has never been performed.

By performing the inching operation in this manner, even if the waste material 34 is hard, the places pressed by the pushing plate 11 are different, so that places that can be crushed can be searched for. Incidentally, in the case of a conventional device such as the present invention that cannot perform inching operation, the pushing plate 11 only moves downward;
During the descent, hard waste is encountered and the relief pressure P
When reaching j, the operation of the pushing plate 11 stops, and in the above example, the relief is continued for a long time from N5=22 to N3≧38, that is, until a count of 38-22=16 or more is obtained. This results in a situation where the pressure Pj is maintained. However, in the present invention, it takes a short time until N4 exceeds 7, that is, when applied to N3, N3
The relief pressure Pj is released at the time of =22+7=29, and the time during which a large load acts on the fluid pump 17 and the cylinder 14 can be shortened.

Note that in the above example, the count number during the second and subsequent inching operations was not illustrated, but as shown in FIG. For example, the start time is 22, and by the time the second start, that is, the next inching pressure Pi is detected,
If it's a count, then 22+4=26. If, 3
If N3 has not reached 38 after the inching operation [S26], for example, if N5 = 35, the push plate 11 will take a further downward stroke B for the remaining count number, that is, 38-35 = 3, and then Move to rolling process C. As shown in FIG. 5(b), when the inching operation is performed three times, the forward rotation stroke C has already become N7=21, so if N7 of the predetermined forward rotation stroke C is up to 39, for example. If so, a count of 18 will remain. By the way, if the inching pressure Pi is lower than the inching pressure Pi by the time it reaches 7 after detecting the inching pressure Pi and starting counting N4, that is, as shown in Fig. 6(C), the inching pressure is lower than the inching pressure Pi at N4=5. If this happens, the state where the inching operation was about to occur is canceled, and the pushing plate 11 continues the primary pressing. Of course, if the inching pressure Pi is detected again, it goes without saying that the inching operation starts from that point.

Next, the operation in the normal forward rotation stroke C will be explained.

Depending on the number of inching operations, the normal rotation stroke C will be performed for the remaining amount. Therefore, the count number N7 in the forward rotation stroke C is a multiple of N6, that is, one of 0, 7°14, and 21. First, step 29 in FIG. 7(a)
It is confirmed that F2=4, and as shown in FIG.
= 0, F4 is set to 1 [S47
], then solenoid SbA is energized ( 34B
). That is, as described above, the pushing plate 11 starts or restarts normal rotation and enters the normal rotation operation, and at the same time, counting of N7 starts or restarts from the previous value [S49]
. It is determined whether N7 has reached the count number 39 until the normal rotation is completed (S50), and if it has not reached that value yet, a count number a based on the rotation of the fluid pump 17 is added to N7 (S51). Then, the process returns to step 3 and reaches step 46, but since F4 is already 1, the process immediately goes to step 50, where α is further added (3
51). In this way, when N7≧39 in step 50, flag F2, which is set to 4, is replaced with 5 (S52). As a result, the pushing plate 11 is moved to the upward stroke.

Returning to step 3, in step 29 it is recognized that F2 is not 4 but in step 53 it is 5, and as shown in FIG.
), the solenoid SbA is demagnetized ( S 5
4). Then, it is determined whether the flag F5=1 (S
55). Since F5 is reset to 0 in step 2, the count number α based on the rotation of the fluid pump 17 is added to the count number N8 in the upward stroke [S56]
, solenoid SaA is energized (S'57). That is, the pushing plate 11 indicated by the two-dot chain line in FIG. 8(e) enters the lifting operation.

Then, it is determined whether the push plate 11 has reached the count number 53 of rising along the guide surface 7 to the opening 4 of the bunker 3 [858], and if it has just started rising, the process passes through step 59. Step 61 is skipped and the process returns to step 3. In the same manner as above, the process returns to step 55, where the count number α based on the zero rotation of the fluid pump 11 is added and N
8 is increased [856].

In this way, if N8≧53 in step 58, [
(See the solid line pushing plate 11 in FIG. 8(e)), the solenoid SbA is also excited (560), and the pushing plate 11 has risen to the opening 4 of the bunker 3 when N8≧53. 11 enters the operation of the pushing stroke E (see FIG. 1) [see FIG. 8(f)]. At this time, the slide cylinder 14
The return oil from the piston side chamber 2 of the cylinder 13 for the push plate
8, the sliding cylinder 14 and the pushing plate cylinder 13 are extended at the same time, and the waste 34 is completely pushed into the garbage storage box 1 during the pushing stroke. In the pushing stroke E, the count number N8 is 6.
Continue until you reach 3. At step 59, N8≧63
When the flag F5 reaches 1, the flag F5, which was O, is set to 1 (S61). Further, return to step 3 and step 55
When F5-1 is confirmed, the flag Fl, which was replaced with 2 in step 6, is set to O (S62). Returning to step 3, Fl = 0 is confirmed, and Fig. 7(a)
As shown in , solenoids SaA and SbA are demagnetized (S63).

This ends the operation of the cycle, but if it is necessary to repeat the next cycle (S64), step l
will be returned to. On the other hand, if there is no need to enter the next cycle, this operation ends. Incidentally, in a device that is set to automatically enter the next cycle after the completion of the - cycle, in step 64, the garbage pushing mechanism will perform the next operation continuously. In that case, Fig. 7 (a
), the process returns to step 2 as shown by the dashed line.

Note that in the cycle motion of the dust pushing device described above, the time required for each stroke is calculated by integrating the count based on the pump rotation from the proximity switch 31, but instead of this, the time required for each operation is A timer is used to control, e.g. step 31 in FIG. 7(d).
Then, time integration may be performed. The same applies to other strokes, and the dust pushing control device can be operated smoothly.

In the above description, the - cycle may include an upward stroke that includes the pushing stroke E and an upward stroke that does not include the downward force ζ pushing stroke E. Furthermore, the present invention is not limited to a cycle consisting of four main strokes, but can also be applied to a cycle consisting of three strokes without an upward stroke, for example.

[Brief explanation of the drawing]

Figure 1 is a side view of the overall configuration of the garbage pushing device in the garbage truck, Figure 2 is a schematic perspective view of the measuring unit for detecting the count based on the rotation of the fluid pump, and Figure 3 is the cycle movement mechanism. Fig. 4 is a schematic block diagram of the operation command means, Fig. 5 (a) is an operation time chart of the solenoid that operates in the case of crushable waste, and Fig. 5 (b) is when the pushing plate is hard. Solenoid operation time chart when the inching operation is repeated when encountering waste, Figures 6 (a) to (c)
Figure 7 is an explanatory diagram of the operating state of the push plate during the downward stroke.
8(a) to 8(g) are flowcharts of the cyclic movement by the dust pushing device, and FIGS. 8(a) to 8(f) are operation state diagrams of the pushing plate in each stroke including the retracting stroke and the pushing stroke in the cyclic motion. l-・Garbage storage box, 3-・Banker, 10-Slider,
11-push plate, 13-push plate cylinder, 14-slide cylinder, 29-operation command means, 34-waste 34, B-down stroke, B a-press stroke, Bcl-
Retraction stroke, G--Position where a sudden increase in working oil pressure occurred, H--End position of pressing stroke. Patent applicant Kizuka Kaihatsu Kogyo Co., Ltd. Agent Patent attorney Katsutoshi Yoshimura (one idiot) (a) Figure (b) Figure (b) Figure (C) Figure (e) Figure Figure (b) Figure (a) Figure (C) Figure (d) Figure (e)

Claims (1)

[Claims] (1) A slider that is mounted inside a packer connected to the rear of the garbage storage box and is raised and lowered by a slide cylinder, and a push plate that is pivotally supported by the slider and rotates forward and reverse by a push plate cylinder. , in the garbage pushing control device which controls the slide cylinder and the pushing plate cylinder and causes the pushing plate to perform a cyclical motion, the waste put into the packer is first pressed by the pushing plate, and in the downward stroke, hard waste is removed. By pressing, the pressure stroke moves from the position where the working oil pressure in the slide cylinder suddenly rises to the pressing stroke where the pushing plate temporarily presses in the primary pressing direction, and the working oil pressure rises. When the pressing stroke is completed, from the end position of the pressing stroke, the lowering stroke of the pushing plate is partially raised and at the same time a retracting stroke is performed in which it is temporarily rotated forward, and then it shifts to the lowering stroke where the primary pressing is performed again. 1. A garbage pushing control device for a garbage truck, characterized in that a garbage pushing control device is provided with an operation command means for controlling the operation.