JP2565747B2 - Dust pushing control device for dust trucks - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust-pushing control device for a garbage truck, and more specifically, to a duster mounted on a packer connected to a garbage storage box of a garbage truck that collects dust. The present invention relates to a dust-pushing control device in which a push-up plate moves up and down and performs a cycle motion accompanied by forward and reverse rotations, and dust can be stored in a dust-packing box.

[Conventional technology]

To control the cycle movement mechanism of the pushing plate in the garbage truck, a sensing device such as a cam or a limit switch is connected to the movable part of the mechanism, and the control device of the cycle movement is operated by this sensing device. I have. In this control device, since the sensing device is in contact with the movable part, it is easily worn, and the cycle motion is modulated,
There is a problem that many sensing devices are required in terms of structure, failures are often generated, and durability is lacking.

In order to eliminate this problem, there is a cycle motion control device described in Japanese Patent Publication No. 51-48555. In this, a proximity plate is attached to a drive shaft of a 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 with the rotation of the fluid pump, a change is given to the high-frequency signal transmitted from the sensing device, so that the rotation speed of the fluid pump can be taken out. I have. A control device that receives a high-frequency signal from a sensing device is used for controlling the cycle motion of the pressing plate, and the sensing device measures the rotation speed of the fluid pump, and sets the rotation speed set in the control device in advance. The control is performed by comparing the measured rotational speed with the measured rotational speed, and the push plate performs a cycle motion including predetermined strokes such as a reversing, descending, forward rotating, and ascending strokes. that time,
The dust thrown into the packer after the pushing plate is turned over is pressed in the descending stroke and the normal rotating stroke of the pushing plate, and then pushed into the dust storing box in the ascending stroke to be smoothly stored.

[Problems to be Solved by the Invention]

In recent years, as refuse to be thrown into a garbage truck, for example, large-scale waste such as an electric washing machine, and hard or deformable waste of various sizes such as an empty can are mixed and thrown in. The pushing plate controlled by the above-mentioned control device, after pressing and crushing the waste in the descending stroke and the forward stroke,
It is designed to enter the ascending stroke, and during the ascending stroke, if the dust storage box is not full, the dust is easily pushed into the dust storage box. The plate will temporarily stop or rise in an extremely slow motion when pushing in dust containing a mixture of large and small hard waste. That is, since the force exerted on the dust during the ascending of the pushing plate does not fluctuate, the pushing plate has entered the ascending stroke, and there is a problem that it is difficult to push in waste and dust efficiently.

The present invention has been made in view of the above problems, and an object thereof is that a pushing plate that has entered an ascending stroke of a cycle motion pushes dust containing hard waste mixed in a packer of a dust truck into a dust storage box. At this time, when you stop by encountering solid waste, etc., while temporarily descending and rising from that position, it promotes densification of waste and deformation of waste, and efficiently disposes of waste. An object of the present invention is to provide a dust pushing control device for a dust truck that can be pushed into a storage box.

[Means for solving the problem]

As shown in FIG. 1, the present invention is provided with a slider 10 mounted inside a packer 3 connected to a rear portion of a dust storage box 1 and moved up and down by a slide cylinder 14, and a slider 10 pivotally supported by the slider 10. The pushing plate 11 that rotates in the normal direction / reverse direction by the plate cylinder 13, the sliding cylinder 14 and the pushing plate cylinder 13 are controlled, and the pushing plate 11 has a reversing stroke A and a descending stroke B.
It is applied to a dust pushing control device that performs a cycle motion including a forward rotation stroke C and a rising stroke D.

The feature is that the descending stroke B in which the pushing plate 11 first presses the waste 34 thrown into the packer 3 [see FIG. 6 (a)] and the ascending stroke after the forward stroke C in which the pushing plate 11 is secondary pressed. At D, from the position G1 (see FIG. 6 (a)) where the hydraulic pressure in the sliding cylinder 14 suddenly rises,
Pushing plate 11 while alternately repeating short descent and long descent
Is provided with the operation command means 29 [see FIG. 3] for arriving at the starting point W.

[Action]

The dust pushing device mounted inside the packer 3 which is continuously provided at the rear portion of the dust 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. The waste 34 such as dust is put into the packer 3, the pushing plate 11 enters the descending stroke B by the operation of the sliding cylinder 14, and the dust is primarily pressed by the pushing plate 11 descending. When the descending stroke B is completed, the pushing plate 11 is secondly pressed by the operation of the pushing plate cylinder 13. Then, the pushing plate 11 enters the ascending stroke D by the operation of the slide cylinder 14, and pushes the dust containing the hard waste 34 into the dust storage box 1. When the dust storage box 1 is not full, the dust is easily pushed in by the pushing plate 11 that moves up. On the other hand, when the dust storage box 1 approaches full capacity, the pushing plate 11 that is rising
The waste 34 is prevented from rising, and the hydraulic pressure in the slide cylinder 14 suddenly rises. At that time, the push-in plate 11 starts to descend for a short time from the position G1 (see FIG. 7) where the operating oil pressure sharply rises, and stops after the set time has elapsed. Cylinder for slide 14
Immediately release the sudden increase in the operating hydraulic pressure inside,
The gap between the dust particles pressing the front surface of the pushing plate (11) is changed, and the attitude of the large and small solid waste (34) is changed. Subsequently, the pushing plate 11 rises for a long time and pushes the waste 34 toward the dust container 1. At that time, the waste whose posture was changed
The deformation of 34 is promoted by the fluctuation of the pressing force, and the dust is densified.

〔The invention's effect〕

According to the present invention, while the pushing plate that has entered the ascending stroke of the cycle movement by the command signal from the operation commanding unit pushes the dust containing the hard waste into the dust storage box, the stop is prevented from rising. When a sudden increase in operating hydraulic pressure occurs in the slide cylinder,
The pushing plate can alternate between short descent and long descent. Therefore, the swinging of the waste and the dust caused by the vertical movement widens the gap between the dust and the space between the wastes, during which the posture of the wastes is changed or deformed to be convenient for pushing, and the pushing plate is fixed to the solid wastes. The mixed dust can be efficiently 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 to a rear upper end of a dust storage box 1 mounted on a frame of a garbage truck by a hinge pin 2, and the packer 3 is lowered. An opening 4 formed in the packer 3 communicates with the inside of the dust container 1. The packer 3 has an input port 5 formed at the rear thereof, and a bottom portion connected to the input port 5 has an arc-shaped compression surface 6 which is depressed downward, and a diagonally upwardly rising portion toward the garbage storage box 1. A guide surface 7 that is continuous with the portion 4 is formed.

The packer 3 accommodates a dust pushing device which compresses dust and pushes it into the dust storage box 1. Hereinafter, the dust pushing mechanism and a device for controlling the mechanism will be described in detail. On both side walls of the packer, guide grooves 8 are formed from the upper front to the 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 grooves 8. . A push plate 11 is swingably supported by a pivot 12 between the lower ends of both sliders 10, and a push plate 11 is provided between a bracket 11a protruding on the back of the push plate 11 and the upper end of the slider 10.
Both ends of a push plate cylinder 13 for swinging the forward and backward directions are pivotally supported. Both ends of a slide cylinder 14 for moving the slider 10 up and down along the guide groove 8 are pivotally supported at the middle of the slider 10 and the lower end of the packer 3. Therefore, by performing sequence control of the slide cylinder 14 and the push plate cylinder 13, for example, the push plate can be
With respect to 11, it is possible to perform a cycle motion consisting of four steps of a reverse stroke A, a primary press descending stroke B, a secondary pressing forward stroke C and an ascending 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 rotating shaft 16 of a power take-off device 15 connected to a traveling engine of a garbage truck, and a hydraulic oil discharged from the fluid pump 17 causes a cycle shown in FIG. The movement mechanism 18 is operated.

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,
Furthermore, it is connected to the other control valve 20b via the communication pipe 19a. The control valve 20a is connected to the rod side chamber 23 and the piston side chamber 24 of the sliding cylinder 14 via conduits 21 and 22,
The control valve 20b is connected to the rod side chamber 27 and the piston side chamber 28 of the push plate cylinder 13 via conduits 25 and 26. The control valve 20a has solenoids SaB and SaA for switching the port to the left port or the right port, and the control valve 20b has
Solenoids SbB and SbA for switching between them are provided, and these solenoids SaA, SaB, SbA and SbB are provided.
Switches the ports of the control valves 20a and 20b, which are sequentially operated during one cycle, according to a command signal from an operation command means 29 to be described later.
Controls 13 movements. Further, in the discharge pipe 19, a relief valve 32 that opens to return the hydraulic oil to the tank when the pressure is increased to the relief pressure, and a pressure sensor 33 that detects whether or not the pressure is higher than a set pressure Pi lower than the relief pressure. Is attached. In this example, the relief pressure is 160 kg / cm ² ,
The set pressure Pi of the push-in plate 11 is set to 155 kg / cm ² .

A rotating plate 16 of a fluid pump 17 shown in FIG. 2 is fixed with, for example, an inverted L-shaped proximity plate 30, and a sensing device 31 is arranged in a position close to and opposed to the proximity plate 30. I have. The number of the proximity plates 30 is not limited to one, and is not shown. For example, a plurality of the proximity plates 30 may be arranged on the circumference. Then, 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 transmitted from the proximity switch 31, thereby changing the rotation speed of the fluid pump 17 to a high frequency signal. Can be taken out as

The operation command means 29 for receiving 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, Whenever the count number based on the rotation of the pump 17 matches or exceeds the set count number, the control valve 20a, 20b of the cycle motion mechanism 18 is commanded to switch each time.

FIG. 4 shows a schematic configuration of the operation command means 29. This is, for example, a microcomputer, which is not shown, and includes a fixed storage unit, an optional writing storage unit, a central processing unit, and the like. Its function is to push the waste put into the packer 3
In the descending stroke B for the primary pressing of 11 and the ascending stroke D after the forward rotating stroke C for the secondary pressing, the waste is pressed and the operating pressure in the sliding cylinder 14 is suddenly increased at the position G1 [first From Fig. 6 (a) and Fig. 7], a temporary descent (hereinafter referred to as "short descent") and a temporary rise longer than the short descent (hereinafter referred to as "long descent") are alternately repeated. The pushing plate 11 is adapted to reach the starting point W.

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 is a sensing device 31
Receiving the high-frequency signal transmitted from the CPU and measures the rotation speed, that is, the count number of the fluid pump 17 by a 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 in an idling state in order to excite or demagnetize the solenoids SaA, SaB, SbA, SbB for switching the control valves 20a, 20b based on the signal from the output circuit Q, and to generate the discharge pressure in the fluid pump 17. The rotary solenoid Sry that increases the engine speed is also excited or demagnetized. The output circuit Q also has a function of clearing the count number measured by the counting circuit L when each count number described later reaches a set maximum value.

In the present example, the pushing plate 11 takes a cycle motion consisting of four steps A to D of reversing, descending, forward rotating, and ascending, and if no hard waste is encountered during the ascending stroke D, the first As shown in the upper part of FIG. 5 (a), the count numbers are accumulated, and one cycle is completed when the accumulated count number Nt is 180, for example. In the idle up stroke I in the figure, the cumulative count number Nt ends at 3, and the engine speed is increased during that period to secure the discharge amount of the fluid pump 17. Inversion stroke A is Nt = 28, descending stroke B is Nt = 65,
The forward rotation stroke C ends at Nt = 101, and the ascending stroke D ends at Nt = 180. In the ascending stroke D, the pushing stroke E can be performed by rotating the pushing plate 11 in the ascending direction at Nt = 170, if necessary.

By the way, the count number Nt of each stroke described above indicates the count number when switching the solenoids SbB, SbA, SaB, SaA, and the completion of the movement of the pushing plate 11 in each stroke is displayed.
It has a smaller count than Nt. That is, the seventh
In the figure, 18 in parentheses for Nt = 28, 55 in parentheses for Nt = 65, 91 in parentheses for Nt = 101, 160 in parentheses for Nt = 180, The movement of the pushing plate 11 in the stroke is completed. This is the cylinder that should have finished moving
In 13 and 14, it is a consideration to ensure that each piston reaches the stroke end.

To explain the main part of the present invention in an easy-to-understand manner, as shown in FIG. 6 (a), the pushing plate 11 that has entered the ascending stroke D is
When the slide cylinder 14 extends due to the excitation of the solenoid SaA to start rising in the direction of arrow 35, counting of the count number N4 indicating the amount of lift starts. Then, like the pushing plate 11 shown by the chain double-dashed line, for example, the cumulative count Nt
= 128 [see FIG. 7], when the waste material 34 is pressed at the position G1 to be in a stopped state, the hydraulic pressure of the sliding cylinder 14 increases. The amount of rise N4 of the pressed position G1 is 128-1
01 = 27. When Pc ≧ Pi is detected by the pressure sensor 33,
As shown in the lower part of FIG. 5, the solenoid SaB is excited by the command signal stored in the operation command means 29, the port of the control valve 20a is switched to the left, and the control valve 20b is kept in the neutral position for sliding. The cylinder 14 contracts, and the pushing plate 11 descends in the direction of arrow 36 for a short time. At that time, counting of the count N2 indicating the short time descent amount is started, and when N2 becomes 2, the pushing plate 11 stops at the position H1, and as shown in FIG. 6 (a),
The distance between dust and waste 34 is increased. The amount of rise N4 of the position H1 of the pushing plate 11 indicated by the solid line is N4 + N3 = 27-2 =
25. When the pushing plate 11 is lowered for a short time, the waste 34 in an inclined posture shown by the chain double-dashed line changes to, for example, a horizontal posture as shown by the solid line.

Then, the slide cylinder 14 is extended by the command signal stored in the operation command means 29, and the pushing plate 11 is moved upward for a long time. The pushing plate 11 shown by the solid line in FIG.
After passing through the position G1, it further rises in the direction of the arrow 35, presses the waste 34 whose posture is changed again, and pushes it toward the dust storage box 1 so as to close the above-mentioned widened space and space. The count number of the push-in plate 11 when it rises for a long time from the position H1 that has dropped for a short time to the position G2 is N1, and is set to 22 counts in this example [see FIG. 5]. After the pushing plate 11 reaches the position G2, the second short descent is performed by the command signal. As shown in FIG. 7, the count number N4 of the pushing plate 11 at the position G2 is 47, which is the end position of the short time descent.
The count number N4 of the pushing plate 11 at H2 is N4 = N4 + N3 = 47
-2 = 45 (see FIG. 5). This count number N4 is
As shown in FIG. 8 (b), it is calculated and stored by N4 + N3 and N4 + N1 and the count is continued until Nt = 180 when the starting point W which is the end position of the ascending stroke D is reached. That is, the solenoid SaA rises for a long time by the operation of the excited sliding cylinder 14, and the solenoid SaB falls for a short time by the operation of the excited sliding cylinder 14, which are alternately repeated. Therefore, even when the dust container 1 is almost full, the pushing plate 11 can efficiently handle the waste.
The 34 can be pushed into the dust container 1. In this example, since the pushing stroke E is included at the end of the ascending stroke D, the above-mentioned short time descent and long time ascent are the cumulative count Nt.
It will be automatically terminated at = 170. By the way, the added number α of the count is a value based on the rotation of the fluid pump 17,
Since the count number α depends on the rotation state of the fluid pump 17, it does not always have the same value, but generally has a different value each time.

In the ascending control device for a refuse truck configured as described above, in the ascending stroke D of the cycle movement, the thrown-in waste 34 is pushed into the refuse container 1 and is automatically set to the starting point W as follows. Can be reached

As shown in the flowcharts of FIGS. 8 (a) and 8 (b), when a pushing start command button (not shown) of the dust pushing device in the garbage truck is pushed, a start signal is inputted to the operation command means 29. The dust pushing device enters the idle up stroke I (see the upper part of FIG. 5) by the command signal, the rotary solenoid (not shown) is excited [S1], and the fluid pump 17 generates the discharge pressure and is in an idling state. The engine speed at is increased. That is, the power extraction device 15 (see FIG. 2) of the garbage truck extracts a large amount of power from the engine, and the power passes through the rotary shaft 16 and the fluid pump 17
Is supplied to the fluid pump 17, and after a lapse of a predetermined time, the fluid pump 17 starts steady operation at a specified rotation speed. As mentioned above, the proximity switch 31
Each time the proximity plate 30 that rotates on the front surface of the fluid pump 17 approaches, the high-frequency signal for each revolution of the fluid pump 17 changes, and the number of changes is counted.

Immediately after the start of counting, the cumulative count Nt ≧
Since it is not 3, [S2], every time the count signal corresponding to the rotation of the fluid pump 17 is detected by the proximity switch 31, the count α is added to the count Nt [S3].
In step 3, Nt = Nt + α is set because the rotation number of the rotary shaft 16 is not necessarily the same each time, and the detected count number is added as α. By the way, α may be 1 or 0 or 3. When Nt ≧ 3 in step 3, the fluid pump 17 is in a steady operation during that time and is in a state capable of discharging hydraulic oil of a predetermined pressure. Then, the solenoid SbB is excited [S4], and the pushing plate 11 enters the reverse stroke A which is the first stroke. As shown in FIG. 9 (a), the control valve 20 a is held in the neutral position, the control valve 20 b is switched from the neutral position to the left port, and the hydraulic oil from the fluid pump 17 is transferred to the push plate cylinder 13. It is supplied to the rod side chamber 27 [see FIG. 3]. Therefore, the pushing plate cylinder 13 is contracted, and the pushing plate 11 is inverted in a direction away from the dust container 1 and becomes substantially horizontal. In this state, refuse and waste are charged into the packer 3 from the charging port 5.

Then, the cumulative count Nt in the reversing operation is Nt ≧
Whether or not it is 28 [S5], Nt has not reached 28 immediately after reversal, so the count α is added to the count Nt [S5].
6]. When Nt ≧ 28, the reversing stroke A ends and the solenoid SbB is demagnetized [S7]. Then, solenoid SaB
Is excited [S8], and the pushing plate 11 descends to enter the descending stroke B. That is, the slide cylinder 14 is reduced and the pushing plate
11 starts descending. As shown in FIG. 9 (b), the control valve 20b is neutralized, the port of the control valve 20a is switched to the left, the sliding cylinder 14 is contracted, and the slider 10 is guided integrally with the pushing plate 11. It is moved along the groove 8. Then, Nt during that time is counted, and it is further asked whether or not Nt ≧ 65 [S9]. If Nt has not yet reached 65, the count α is added to the count Nt [S1
0]. When Nt ≧ 65, the descending stroke B ends, the solenoid SaB is demagnetized [S11], the solenoid SbA is excited [S12], and the pushing plate 11 enters the forward rotation stroke C. That is, the pushing plate cylinder 13 extends, and the pushing plate 11 starts to rotate normally. As shown in FIG. 9 (c), the control valve 20 a is neutralized, while the control valve 20 b is switched to the right port, and the pushing plate cylinder 13 extends and moves toward the opening 4. Then, Nt in the meantime is counted, and it is further asked whether or not Nt ≧ 101 [S13]. If 101 is not reached, the count α is added to the count Nt [S1.
Four〕. When Nt ≧ 101, the forward rotation stroke C ends and the solenoid SbA is demagnetized [S15] and the solenoid SaA
Is excited [S16], and the pushing plate 11 enters the ascending stroke D. That is, as shown in FIG. 9 (d), the control valve 20b is made neutral, the control valve 20b is switched to the right port, and the hydraulic oil from the fluid pump 17 is transferred to the piston side chamber 24 of the sliding cylinder 14. [See FIG. 3], whereby the sliding cylinder 14 extends and the slider 10 is pushed into the pushing plate 11.
And is raised along with the guide groove 8. Then, it is asked whether or not the cumulative count number Nt ≧ 170 [S17]. In this example, the cumulative count number Nt at which the pushing plate 11 reaches the original point W at the end of the ascending stroke D is 180. That is, the pushing stroke E is started at the cumulative count number Nt ≧ 170 at the end of the rising stroke D shown in the upper part of FIG. 5 (see FIG. 5). Still after the rise started
If not 170, it is asked whether or not the pushing plate 11 which is rising pushes the waste 34 and Pc ≧ Pi [S18]. If the pushing plate 11 can be lifted, the count α is added to the count Nt [S19], and Nt ≧ 170 is again asked [S17]. After that, when the pushing plate 11 can be raised, that is, when Nt ≧ 170 without an increase in the working hydraulic pressure in the piston side chamber 28 of the sliding cylinder 14, as shown in FIG. 9 (e),
With the excitation of the solenoid SaA maintained, the solenoid S
When bA is excited [S20], the sliding cylinder 14 and the pushing plate cylinder 13 both extend, and the pushing plate 11 enters the pushing stroke E. Then, it is asked whether Nt ≧ 180 [S21], and the pushing plate 11
Is not yet at the starting point W, the count α is added to the count Nt [S22], and when Nt reaches 180 [S2
1], the upward stroke D of the pushing plate 11 is completed, and the solenoids SaA, S
When bA is demagnetized [S23], the pushing plate 11 can start the next cycle motion.

On the other hand, when the dust container 1 is almost full, the ascending stroke D
As shown in FIG. 6 (a), the pushing plate 11 that has entered enters a stopped state at a position G1 where Nt = 128, and the working hydraulic pressure of the piston side chamber 28 of the sliding cylinder 14 rises to increase the detection pressure Pc. ≧ Pi [S18]. Step 2 shown in FIG. 8 (b)
In step 4, N4 = Nt−101 obtained by subtracting Nt = 101 at the end of the forward rotation stroke C from the cumulative count Nt at the time of detection is calculated [S2
4], the rising position G1 indicated by N4 is confirmed [see FIGS. 5 and 7]. Then, the solenoid SaB is excited [S25], and as shown in FIG. 9 (f), the control valve 20b remains neutral, the right port of the control valve 20a is switched to the left, and the pushing plate is rising. 11 will immediately begin a short descent. Due to the lowering, the pressurization of the piston side chamber 24 (see FIG. 3) of the sliding cylinder 14 is immediately released. Then, counting of the count number N2 is started, and it is queried whether or not N2 has reached the count number of the short-time falling set to 2 [S26]. If N2 ≧ 2 is not satisfied, the count number N3 that counts the descending amount of the pushing plate 11 due to the short-time descending is stored as a negative value of N2 [S27]. Next, ascending stroke D
N3 is added to the count number N4, which indicates the amount of rise of the push-in plate 11 after entering and rising, and N4 = N4 + N3 is calculated and stored [S2
8] At that time, whether or not Nt ≧ 170 is asked [S29]. If the ascending stroke D of the pushing plate 11 is not finished, the count α is added to the count N2 [S30], and when N2 ≧ 2, [S2
6], the pushing plate 11 is briefly lowered from the position G1 to the position H1 and stopped [see FIG. 7]. As a result, as shown in FIG. 6 (a), the waste 34 in the inclined posture of the alternate long and two short dashes line changes its posture, while the dust gap and the waste 34 are widened. Further, N4 = N4 + N3 is calculated and stored [S31], and the count numbers N2 and N3 are cleared [S32]. After the position H1, the solenoid SaA is operated by the command signal stored in the operation command means 29 regardless of whether Pc ≧ Pi is detected.
Is re-excited [S33], the left port of the control valve 20a is switched to the right [see FIG. 3], and the pushing plate 11 starts to rise for a long time. If the count number N1 indicating the long-time increase has not reached the set count 22 [S34], the count α is added to the long-time increase count N1 [S35]. N
When 1 ≧ 22 [S34], the position is raised to the position G2 shown in FIG. 7 and stopped. Then, N4 = N4 + N1 is calculated and stored [S3
6], the position of the pressing plate 11 at the position G2 is confirmed, and N1 is cleared [S37]. Then, returning to step 25, the solenoid SaB is excited [S25], and as the command signals are sequentially transmitted, the pushing plate 11 is lowered for a short time to reach the position H2, and the pushing plate 11 continues to rise. , Step 29
When Nt ≧ 170 in step, the process returns to step 20 shown in FIG. Then, in addition to the energized solenoid SaA, the solenoid SbA is also energized [S20], the slide cylinder 14 and the push plate cylinder 13 both expand, the push plate 11 enters the push stroke E, and the dust is collected in the dust box. Push into 1 efficiently. When Nt ≧ 180 [S21], the pushing plate 11 completes the pushing stroke E. At that time, the solenoids SaA and SbA are demagnetized [S23], the pushing plate 11 has reached and returned to the starting point W, and one cycle motion of the pushing plate 11 that pressed the waste 34 in the ascending stroke D is completed. , Can proceed to the next cycle exercise.

In the above-described cycle movement of the dust pushing device, the time required for the operation of each stroke is performed by integrating the number of counts based on the rotation of the pump from the proximity switch 31. A timer is used to control, for example, step 3 in FIG. 8 (a).
Then, time integration may be performed. The same applies to other processes, and the dust pushing control device can be smoothly operated.

In the above description, the ascending stroke D including the pushing stroke E is included in one cycle, but an ascending stroke without the pushing stroke E may be used. And the short descent and the long descent are once Pc
When ≧ Pi, even if Pc ≧ pi during the subsequent long-term rise, this is repeated, but Pc ≧ pi during the long-term rise.
When it does not become Pi or at an early time below the specified count
Since Pc ≧ Pi may be satisfied in some cases, if Pc ≧ Pi is not detected during the long-time rise, the rise may be continued, and if detected, it may be immediately lowered at that time. Whichever control mode is adopted, the rapid lowering of the working hydraulic pressure in the slide cylinder 14 is immediately released by the short-time lowering, and the front surface of the pushing plate 11 is pressed against the front surface of the pushing plate 11 by the changing force during the rising. The gap between the dust particles can be changed, and the attitude of the large and small solid waste 34 can be changed. Then, the deformation of the waste with the posture changed is promoted, and the dust is densified with each other. That is, the waste or dust is oscillated by the vertical movement, so that the pushing of the waste 34 is promoted, and the pushing plate can efficiently push the dust containing the 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. FIG. 4 and FIG. 4 are schematic configuration diagrams of the operation commanding means, and FIG. 5 is a case in which the pushing plate continuously pushes the waste into the dust container in the ascending stroke, and pushes it while repeating the short descent and the long descent. 6A and 6B are explanatory diagrams showing the movement of the pushing plate and the behavior of the waste based on it, and FIG. 7 is the operation of the pushing plate in the ascending stroke. State diagrams, FIGS. 8 (a) and 8 (b) are flow charts of the cycle movement by the dust pushing device, and FIGS. 9 (a) to 9 (f) are pushing of each stroke including short-time lowering and long-time raising in the cycle movement. It is an operating state figure of a board. 1 ... dust storage box, 3 ... packer, 10 ... slider, 11
...... Pressing plate, 13 ...... Pressing plate cylinder, 14 ...... Sliding cylinder, 29 ...... Operation command means, 34 ...... Waste, A ...
… Reverse stroke, B …… Descent stroke, C …… Normal rotation stroke, D ……
Ascending stroke, G1 ... Position where a sudden increase in hydraulic pressure occurs,
W ... the starting point.

Claims (1)

(57) [Claims] 1. A slider mounted inside a packer continuously provided at the rear part of a dust container, and a slider that is moved up and down by a slide cylinder, and a pusher that is rotatably supported by the slider and that is rotated forward and reverse by a push plate cylinder. In the dust pushing control device for controlling the plate, the sliding cylinder and the pushing plate cylinder to cause the pushing plate to perform a cycle motion including a reverse stroke, a descending stroke, a forward stroke and an ascending stroke, the dust is pushed into the packer. In the descending stroke in which the pushing plate primarily presses the waste and the ascending stroke after the forward stroke in which the pushing plate is secondary pressed, the hydraulic pressure in the sliding cylinder rises rapidly from the position where it suddenly drops and the A dust-pushing control device for a garbage truck, characterized in that it is provided with operation command means for making the pushing plate reach the starting point while alternately repeating the raising. .