JP2662733B2 - Dust pushing control device for dust trucks - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dust pushing control device for a garbage truck, and more particularly, to garbage mounted on a packer connected to a garbage container of a garbage truck for collecting trash. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-in device, and more particularly to a dust push-in control device capable of storing dust in a dust storage box by performing a cycle movement with vertical movement and forward / reverse rotation.

[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 liable to be worn, and its cycle movement is disordered,
There is a problem that many sensing devices are required in terms of structure, failures are often generated, and durability is lacking.

To solve this problem, there is a cycle motion control device described in Japanese Patent Publication No. 51-48555. In this method, a proximity plate is attached to a drive shaft of a fluid pump, and a sensing device is provided 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 put into the packer is compressed mainly in the downward stroke and the normal rotation stroke of the push plate, and is smoothly stored in the dust storage box in the upward stroke.

[Problems to be solved by the invention]

In recent years, large and hard waste such as an electric washing machine and an electric refrigerator is often introduced as garbage to be thrown into a garbage truck. At that time, the pushing plate controlled by the above-mentioned control device does not perform a special movement so as to press the inputted hard waste and efficiently crush it. There is a problem that it is difficult to be efficiently stored in the storage box.

Further, in the cycle motion of the push plate controlled by the above-described control device, when the push plate that descends or rotates forward encounters hard waste and stops, the fluid pressure increases and the relief valve operates. Will do. The push plate advances to the next stroke after completion of a count based on the rotation of the fluid pump corresponding to all strokes of each stroke preset in the control device or after a lapse of a predetermined time. Since the hydraulic circuit for operating the cylinder and the like is kept at a high pressure state for a long time, problems such as adversely affecting the life of the fluid pump and the like arise.

The present invention has been made in view of the above problems, and has as its object to crush hard waste put in a packer of a garbage truck by sequentially pressing various places with a pushing plate to efficiently remove garbage. A garbage of a garbage truck that can be pushed into a storage box and, as a result, a hydraulic device such as a cylinder that operates a pushing plate does not maintain a high pressure state for a long time, and a fluid pump or a cylinder can operate stably for a long time. A push control device is provided.

[Means for solving the problem]

As shown in FIG. 1, the present invention comprises a slider 10 mounted inside a packer 3 connected to the rear of the refuse storage box 1 and raised and lowered by a slide cylinder 14, and a pushing plate pivotally supported by the slider 10. The present invention is applied to a dust pushing control device that controls the pushing plate 11 that rotates forward and reverse by the use cylinder 13, the slide cylinder 14 and the pushing plate cylinder 13, and causes the pushing plate 11 to perform a cycle motion.

The characteristic feature is that the waste 34 (see FIG. 6 (a)) put into the packer 3 is pressed by pressing the solid waste 34 in the forward rotation process C in which the pressing plate 11 performs secondary press. From the position G where the operating oil pressure rises sharply in the plate cylinder 13, the pressing plate 11 is temporarily pressed in the secondary pressing direction as it is in the state where the operating oil pressure is increased to further press the waste 34. When the predetermined time of the pressing stroke Ca in which the operating oil pressure is raised ends when the operating pressure is increased, the return stroke in which the forward rotation stroke C of the press-in plate 11 is partially retracted from the end position H of the pressing stroke Ca. Cb is performed for a predetermined time, and a temporary ascent stroke Bc that temporarily rises from the end position K of the return stroke Cb is performed for a predetermined time, and from the end position of the temporary ascent stroke Bc to the forward rotation process C where secondary press is performed again. After that, work inside the push plate cylinder 13 Each time a rapid increase in the hydraulic pressure occurs, the inching operation consisting of the pressing stroke Ca, the return stroke Cb, and the temporary rising stroke Bc is sequentially performed, and after the inching operation is completed, the remaining forward rotation stroke C is completed on the press-in plate 11. That is, an operation command means 29 (see FIG. 3) is provided.

[Action]

The dust pushing device mounted inside the packer 3 connected to the rear 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 push plate 11 enters the forward rotation stroke C for secondary pressing by the operation of the push plate cylinder 13, and when the hard waste 34 is encountered,
The working oil pressure in the push plate cylinder 13 sharply rises. At this time, the forward rotation of the pushing plate 11 is blocked,
From the position G where the working oil pressure suddenly rises, the pushing plate
This is the pressing stroke Ca in which the forward rotation operation of 11 is further continued temporarily. When the temporary pressing operation is completed, from the end position H of the pressing stroke Ca, the return stroke Cb [FIG. a)] until the predetermined time has elapsed. From the end position K of the return stroke Cb, the temporarily rising stroke Bc, which is temporarily raised, is started by the operation of the slide cylinder 14, and is stopped after a predetermined time has elapsed. Again, by the operation of the pushing plate cylinder 13, the pushing plate 11 enters the normal rotation stroke C and rotates forward, and a different place of the hard waste 34 or a place where the waste does not exist is secondarily pressed. Sequentially
This operation is repeated, and the pressing plate 11 can efficiently press and crush the hard waste 34 at different locations. When the inching operation including the predetermined number of pressing steps is completed, the push plate 11 proceeds to the remaining forward rotation step C, and smoothly stores the crushed wastes 34 sequentially in the dust container 1.

〔The invention's effect〕

According to the present invention, the command signal from the operation command means reduces the pressing time while the push plate encounters solid waste in the forward rotation stroke of the cycle motion, which occurs when the high pressure state continues. It is possible to avoid a decrease in durability of a hydraulic device such as a fluid pump or a cylinder. in addition,
In the forward rotation process, the pushing plate successively presses different places, so that the crushing of dust and waste is promoted, and the pushing of the dust and the waste into the box becomes smooth.

〔Example〕

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

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 that compresses dust and pushes the dust into the dust storage box 1. Hereinafter, the dust pushing mechanism and a device for controlling the mechanism will be described in detail. Guide grooves 8 are formed on both side walls of the packer 3 from front upper to lower rear. A pair of right and left sliders 10 having a pair of guide rollers 9a and 9b are slidably supported in the guide grooves 8. I have. A push plate 11 is pivotally supported by a pivot 12 between the lower ends of the sliders 10, and a bracket 11 a projecting from the back of the push plate 11 and an upper end of the slider 10 are provided with a push plate 1.
Both ends of a push-plate cylinder 13 for swinging 1 in the normal rotation direction and the reverse direction are pivotally supported. Both ends of a sliding cylinder 4 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, for example, by performing sequence control on the slide cylinder 14 and the pressing plate cylinder 13, the reversing process A, the primary pressing descending process B, and the secondary pressing are performed on the pressing plate 11, as shown by the two-dot chain line. It is possible to perform a cycle motion consisting of four strokes, ie, a forward rotation stroke C and a rising stroke D.

FIGS. 2 to 4 show a cycle exerciser for causing the push plate 11 to perform a cycle exercise. 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.
Control 13 actions. The discharge pipe 19 detects a relief valve 32 that opens when the pressure is raised to the relief pressure and returns the hydraulic oil to the tank, and whether or not the pressure is higher than an inching pressure Pi set to a pressure lower than the relief pressure. A pressure sensor 33 is attached.

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 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, that is, 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
Pressing hard waste in the forward rotation process C (see FIG. 6 (a)) where the secondary press 11 presses the cylinder for the pressing plate.
From the position G where the working oil pressure suddenly rises in 13, the pressing plate 11 is temporarily pressed in the secondary pressing direction as it is in a state where the working oil pressure is increased, and shifts to a pressing stroke Ca where the waste is further pressed. When the predetermined time of the pressing stroke Ca in which the operating oil pressure is increased ends, the return stroke Cb for partially retreating the forward rotation stroke C of the pressing plate 11 from the end position H of the pressing stroke Ca is performed for a predetermined time. The temporary ascending stroke Bc which temporarily rises from the end position K of the return stroke Cb is performed for a predetermined time, and the process is shifted from the end position of the temporarily ascending stroke Bc to the forward rotation process C in which the secondary press is performed again. Each time the operating oil pressure in the push plate cylinder 13 suddenly rises, an inching operation consisting of a pressing stroke Ca, a return stroke Cb, and a temporary rising stroke Bc is performed sequentially, and after the inching operation is completed, the pushing plate 11 To the remaining forward rotation And it is adapted to complete the Sixth view (b) refer to Fig.

As a specific 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 speed of the fluid pump 17 measured by the counter circuit L reaches or exceeds a preset set rotation speed, that is, a set count number. Has become. The output holding circuit M
Is in an idling state to excite or demagnetize the solenoids SaA, SaB, SbA, SbB for switching the control valves 20a, 20b based on a signal from the output circuit Q and to generate a discharge pressure in the fluid pump 17. The rotary solenoid Sry that starts increasing the engine speed is also excited or demagnetized. The output circuit Q also has a function of resetting the count number measured by the counter circuit L to 0 when each count number described below reaches a set maximum value.

In this example, if the pressing plate 11 takes a cycle movement consisting of four steps A to D of reversing, descending, normal rotation and ascending, and if there is no need to press hard waste in the meantime, FIG. As shown in (1), one cycle is completed by accumulating the count number N0. For example, in the forward rotation process C, the solenoid SbA is excited to extend the push plate cylinder 13, but during that time, the cumulative count is set to be continued for a time corresponding to the count 39 from 65 to 103. ing. As described later, while the electric signal circulates once in the control system, the count number α based on the rotation of the fluid pump 17 is added. Since the count number α depends on the rotation state of the fluid pump 17, the count number α is not always the same value and generally differs each time.

In the present invention, in the forward rotation process C, the pushing plate
When the hard disk 11 encounters hard waste and presses the oil pressure to the push plate cylinder 13 (see FIG. 3) above the set inching pressure Pi, the push plate 11 is further corrected from the position G. Press in the turning direction. In the meantime, the pressing is continued until the predetermined count number is reached, and thereafter, the pressing plate 11 is inverted from its reaching position H, and the crushable portion of the waste is again pressed again at a different position with the hard waste. By the way, when the inching pressure Pi is generated, the hydraulic oil almost immediately reaches the relief pressure Pj when the inching pressure Pi is generated. Only for a short time of the stroke Ca, the fluid pump 17 and the cylinder 13 will not be adversely affected.

Here, the operation forming the main part of the present invention will be described in a more easily understood manner. In FIG. 6 (a), a push plate indicated by a chain line
11 reduces waste 34 by reducing the size of the slide cylinder 14.
Is lowered in the direction of arrow 35 toward. Then, at the position indicated by the two-dot chain line where the primary press is performed, the push plate 11 is in a state where it has finished descending the count number N3 = 38 minutes. Subsequently, when the push plate 11 is rotated forward in the direction of the arrow 36 due to the extension of the push plate cylinder 13, the count N4 starts counting, and the push plate 11 encounters the waste 34 as shown by the solid line. If the waste 34 is hard and not crushable, the pressure in the piston-side chamber 28 of the push plate cylinder 13 increases in the state shown in the figure. The pressure Pc detected by the pressure sensor 33 is the inching pressure
Upon reaching Pi, the count of the count number N5 is started at that point. The count is 7
The supply of the hydraulic oil to the push plate cylinder 13 is continued until the pressure becomes. At this time, the waste 34 is harder than the position G, and the pressing plate 11 takes a pressing stroke Ca that does not move any more or slightly crushes. Assuming that the push plate 11 further rotates in the direction of the arrow 37 in order to facilitate visual understanding, it continues up to the above-mentioned count number 7. When the count reaches 7, the pressing stroke Ca is terminated, the port of the control valve 20b is switched at the position H, and a separate count (N6 to be described later) is started from that point. Hydraulic oil is supplied to the rod-side chamber 27 of the push plate cylinder 13 until the count reaches, for example, 12. This step is a return step Cb of the push plate 11, and the push plate 11 is separated from the waste 34 in the direction of the arrow 38. At this time, it goes without saying that the pressure detected by the pressure sensor 33 is lower than the inching pressure Pi. When the count reaches 12, the compression operation of the pressing plate cylinder 13 is stopped. Further, a separate count (N7 described later) is started, and from the end position K of the return stroke Cb, hydraulic oil is supplied to the piston side chamber 24 of the slide cylinder 14 and a temporary ascent stroke Bc that partially returns the descending stroke B is performed. The push plate 11 is controlled to move in the direction of the arrow 39. When the count N7 becomes 12, its operation is stopped,
By the extension operation of the push plate cylinder 13 again, the inching operation is repeated a preset number of times as shown in FIGS. 5 (b) and 6 (b).

The garbage truck push-in control device configured as described above is capable of crushing the input waste 34 by operating as follows in one cycle including the forward rotation process C.

As shown in the flowcharts of FIGS. 7 (a) to 7 (g), when a pushing start command button (not shown) of the dust pushing device in the dust truck is pressed [S1], a start signal is input to the operation command means 29. And the pushing plate 11 in the dust pushing device.
The flag F1 indicating each stroke operation during the cycle movement of
2, F3 and F4 are each set to 0 [S2]. It is determined whether or not F1 = 0 (S3), and F1 = 1 is confirmed in step 4, and the operation command means 29 sets all the count numbers to. That is, N1 = 0, N2 = 0,..., N8 = 0, and X indicating the number of inching operations of the push plate 11 performed when the hard waste 34 is encountered is set to 0 [S5]. ]. Next, the flag F1 set to 1 in step 2
Is replaced by 2, and the flag F2, which is set to 0, is replaced by 1 [S6]. Subsequently, it is determined whether or not F2 = 1 (S7). By the way, the flag F2 takes any one of 1 to 5, and goes to an idle-up process I in which the engine speed is increased when F2 = 1, and a reversing process A in which the pushing plate 11 is reversed when F2 = 2.
To the descending stroke B for primary pressing at F2 = 3, to the forward rotation stroke C for secondary pressing at F2 = 4, and to the ascent stroke D including the pushing stroke E at F2 = 5. Has become.

As shown in FIG. 7 (b), by setting the flag F2 = 1, the dust pushing device enters the idle-up stroke I, the count number N1 in that stroke is measured, and the rotary solenoid [not shown] is excited [ S8] In order to generate the discharge pressure in the fluid pump 17, the number of revolutions of the engine in the idling state is increased. That is, the power take-off device 15 (see FIG. 2) of the garbage truck takes out large power from the engine, and the power is supplied to the fluid pump 17 via the rotating shaft 16, and after a lapse of a predetermined time, the fluid pump 17 Is assumed to be a steady operation. As described above, each time the proximity plate 30 rotating in front of the proximity switch 31 approaches, the fluid pump 17
The high-frequency signal changes for each rotation, and the number of changes is counted.

Now, immediately after the start of counting and N1 ≧ 3 is not satisfied [S9], every 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 N1 [S10]. ], And return to step 3 in FIG. The reason that N1 = N1 + α in step 10 is that the detected number of counts is added as α because the rotational speed of the rotary shaft 16 during the circulation of the electric signal is not always the same each time. Is as described above. That is, α may be 1 or 0 or 3. In step 6, F1 becomes 2 and F2
Is replaced by 1, so that the process moves from step 4 to step 11 through step 11.

From step 7 to step 9, the addition of the count N1 [S10] is repeated, and if N1 ≧ 3 [S9], the flag F
2 is set to 2 [S12], and the process returns to step 3. Then, the process traces to step 7, and proceeds from step 13 to step 14 in FIG. 7 (c). Fluid pump between more
The operation 17 is in a steady state, and is in a state in which hydraulic oil at a predetermined pressure can be discharged. Then, the reversing process A, which is the first process of the pushing plate 11, is started. That is, after steps 4, 11, and 7,
At 13 it is confirmed that F2 = 2. Then, only the solenoid SbB (see FIG. 3) is energized, and the pushing plate 11 enters the reversing stroke A, during which the count N2 is started. When the solenoid SbB is excited [S14], the control valve 20b shown in FIG.
Is supplied to the rod side chamber 27 (see FIG. 3) of the push plate cylinder 13. As shown in FIG. 8 (a), the pressing plate cylinder 13 is reduced, and the pressing plate 11 is inverted in a direction away from the trash storage box 1 to be substantially horizontal. In this state, refuse and waste are charged into the packer 3 from the charging port 5.

Since N2 is counted simultaneously with the start of the inversion of the push-in plate 11, the operation is continued until the count number 23 at which the inversion process A is completed is reached. Specifically, in step 15, the count number N2
Is determined to be not the preset 23, α is added to the count N2 every time the proximity switch 31 detects the rotation of the fluid pump 17 [S16]. Then, the process returns to step 3 and proceeds to step 15 via steps 4, 11, 7, 13, and 14, and thereafter, the count N2 is increased by the same operation. Such an operation is repeated, and in step 15, N2 ≧ 23
Is determined, the flag F2 set to 2 is replaced with 3 [S17]. As a result, the process moves to the descending process B as the primary press of the next process.

That is, through steps 4, 11, 7, and 13, at step 18, F2
= 3 is confirmed. Then, the solenoid SbB (see FIG. 3) is demagnetized [S19], and further, the solenoid SaB is energized, and the push-in plate 11 becomes the descending stroke B, during which the count N3 is started. When the solenoid SaB is excited [S20], the control valve 20a shown in FIG. 3 is switched to the left port, and the hydraulic oil from the fluid port 17 is supplied to the rod side chamber 23 of the slide cylinder 14 (see FIG. 3). . Then, as shown in FIG. 8 (b), the slide cylinder 14 is reduced, the slider 10 is moved along the guide groove 8 integrally with the push plate 11, and the push plate 11 starts to descend.
In this example, even if the pressing plate 11 encounters the waste 34 in the descending stroke B of the primary press, the waste 34 is described as being soft or easily broken by pressing. That is, it is assumed that the descending stroke B is completed at N3 = 38 counts as shown in FIG. 6 (b).

Since N3 is counted at the same time when the pressing plate 11 starts lowering, it continues until the count number 38 at which the lowering stroke B ends is reached. Specifically, in step 21, the count number N3
Is not the preset 38, α is added to the count N3 every time the proximity switch 31 detects the rotation of the fluid pump 17 [S22]. And step 3
And the process proceeds to Step 21 through Steps 4, 11, 7, 13, and 18, and the count N3 is increased by the same operation. This operation is repeated, and when it is determined in step 21 that N3 ≧ 38, the flag F2 set to 3 is replaced with 4 (S23). As a result, the process proceeds to the forward rotation process C as a secondary press of the next process.

In this example, the pushing plate 11 is a solid waste in the forward rotation process C.
34 (see FIG. 6 (a)), when the inching operation is performed by collision, a return stroke Cb for returning a part of the forward rotation stroke C as necessary, and a temporary ascent stroke Bc. Is to be performed. However, for the moment,
The case where the waste 34 is soft and crushable will be described. Since it has been replaced with F2 = 4, the process returns to step 3 and moves from step 4 to step 24 through steps 11, 7, 13, and 18, and it is confirmed that the flag F2 is 4.
As shown in FIG. 7 (e), first, the solenoid SaB is demagnetized [S25], while the demagnetized state of the solenoids SaA and SbB is also maintained [S26]. Subsequently, it is determined whether or not the flag F3 is 0 (S27). Since F3 is set to 0 in step 2, the solenoid SbA (see FIG. 3) is excited (S28).
As shown in FIG. 8 (c), when the cylinder 13 for the pushing plate is extended, the pushing plate 11 starts normal rotation.

Here, measurement of the count number N4 for controlling the forward rotation process C is started. If the waste 34 is soft or easily broken by pressing, the pressure Pc of the hydraulic oil in the cylinder 13 for the pushing plate does not become too high. Therefore, if the pressure Pc detected by the pressure sensor 33 is lower than the inching pressure Pi [S29], N5 indicating the count number of the pressing stroke Ca remains 0 [S30].
The state of 3 = 0 is maintained [S31], and the pushing plate 11 is moved in the forward rotation stroke C.
Then, it is determined whether or not the count number N4 after shifting to has reached 39 [S32]. The count number α is added to the count number N4 by the signal from the proximity switch 31 (S3
3], and return to step 3. Then, the count number N4 is increased while following the same route. In this way, if N4 ≧ 39 in step 32, the flag F2 set to 4
Is replaced with 5 [S34]. Then, the process returns to Step 3 and follows Steps 7, 11, 13, 18, and 24 to reach Step 35. As a result, the operation command means 29 issues a command to shift to the next step, which is the ascending step D. That is, as shown in FIG. 7 (g), the solenoid SbA is demagnetized [S57] and the solenoid SaA is excited [S60], the control valve 20b is set to neutral, and the control valve 20a is switched to the right port [eighth]. See FIG. Thus, the pushing plate 11 shifts to the ascent stroke D.

Next, when the waste 34 is hard to be crushed and the pushing plate 11 cannot continuously shift to the count number N4 of 39 in the forward rotation process C for secondary pressing, that is, the core of the present invention. The operation will be described.

For example, when the push plate 11 encounters the hard waste 34 into which the push plate 11 is put and the count number N4 is 22 (see FIG. 6 (b)), and if the waste 34 is not crushed, the piston side chamber 28 of the push plate cylinder 13 is not damaged.
The pressure of [see FIG. 3] increases. At this time, the pressing plate 11 enters the pressing stroke Ca, but the excitation of the solenoid SbA is maintained [S28]. This pressure increase is detected by the pressure sensor 33 as an inching pressure Pi of, for example, 155 kg / cm ² before reaching a relief pressure of, for example, 160 kg / cm ² . When the detected pressure Pc becomes larger than Pi in this way, [S2
9], the inching operation starts from the position G (see FIG. 6 (a)).

Since the inching is about to start, the number of inchings X is not 3 or more (S36).
Never go to 3. Therefore, at this time, the measurement of the count number N4 of the forward rotation process C is temporarily stopped at the count of 22. Then, at the start of the inching operation, the pushing plate 11 presses the hard waste 34 to be in a stopped state, or is further in a state of slightly rotating, and enters the pressing stroke Ca. on the other hand,
The counting of the time count N5 in the pressing stroke Ca is started, and α is added to N5 based on the rotation of the fluid pump 17 [S37]. Subsequently, it is asked whether the count number N5 has reached 7 [S38]. Since the measurement has just started, N5 is smaller than 7, and the process returns to step 3, and thereafter, steps 4, 11, 7, 13 , 18, and 24, N5 is increased in step 37 shown in FIG. Since the count has not yet reached 7, it is repeated until the count number N5 becomes 7 in the same circulation of the electric signal as described above.
If determined to be 7, the push plate 11 stops at the position H [see FIG. 6 (a)] or is kept in a stopped state when it encounters, and the count number for which N5 ≧ 7 has already been reached. Is 0
Is reset to [S39].

Since the pressing stroke Ca of the first half of the inching operation is performed in this manner, the number of inchings X, which is 0,
Is added to [S40], and it is further questioned whether or not X ≧ 3 [S41]. Then, since X = 1, F3 set to 0 in step 2 is set to 1 [S42]. Return to Step 3, go through Steps 4, 11, 7, 13, 18, 24, and go to Step 2.
At 7, it is determined that F3 is not 0, and F3 = 1 is confirmed [S4
3], the pushing plate 11 enters the return stroke Cb (see FIG. 6 (b)).

As shown in FIG. 7 (f), the solenoid SbB is excited, and the control valve 20b having the left port opened is switched to the right port. Hydraulic oil from the fluid pump 17 is supplied to the rod side chamber of the push plate cylinder 13 as shown in FIG.
27 (see FIG. 3), whereby the press plate cylinder 13 contracts. As a result, the pushing plate 11 is moved in the normal rotation stroke C.
Is returned (see FIG. 6A) [S44]. At this time, the count of N6 is started and the return is finished.If N6 ≧ 12 has not been reached (S45), α based on the rotation of the fluid pump 17 is the count number N
6 [S46]. Then, the process returns to step 3, and after step 43 (see FIG. 7 (e)) again, in step 46, α is further added to N6 [S46].

When N6 ≧ 12 is reached in this way (S45), the pressing plate 11
Is completed and the flag F3 set to 1
Is replaced with 2 [S47], and N6 is reset to 0 [S48]. As a result, the pushing plate 11 moves its return stroke Cb
From the end position K [see FIG.
to go into.

Then, the process returns to step 3 and again reaches step 43 in FIG. 7 (e). Then, since F3 is not 1, it is confirmed that it is 2 [S49]. In step 50 of FIG. 7 (f), the solenoid SbB is demagnetized [S50], while the solenoid SaA is excited [S51]. That is, the solenoid Sb
By demagnetizing B and exciting the solenoid SaA, the control valve 20b is switched to the neutral position, and the control valve 20a is switched to the right port. Hydraulic oil from the fluid pump 17 is supplied to the piston side chamber 24 of the slide cylinder 14, whereby the slide cylinder 14 extends as shown in FIG. 8 (e), and the pushing plate 11 temporarily rises. Enter ascent operation. At the same time, the count of N7 starts, and the push plate 11 finishes temporarily rising.
Although it is determined whether or not ≧ 12 [S52], since N7 has not yet reached 12, the count α based on the rotation of the fluid pump 17 is added to N7 [S53]. Then, the process returns from step 3 to step 52, and the signal circulation is repeated until N7 ≧ 12, and N7 increases.

When N7 ≧ 12 is reached in this way (S52), the pressing plate 11
Is terminated, and the flag F3 set to 2 is replaced with 0 [S54]. Here, the above-mentioned N7 is added to the count number N8 in the ascent stroke D which is set to 0 [S55]. That is, N8 = 12. In addition, N7 is reset to 0 [S56], and the process returns to step 3 to demagnetize the solenoid SbB in step 26 shown in FIG. Then, since the flag F3 is set to 0 in step 54, the solenoid SbA is excited [S28], and further, in step 29, the operating oil pressure to the pressing plate cylinder 13 is increased by inching during the secondary press that is being performed. It is determined whether or not the pressure Pi is exceeded, and if there is no pressure increase, the process proceeds from step 30 to step 33, and the counting of N4 which has been stopped when the inching operation was previously started is restarted. Then, the process returns to step 3 to count the number of secondary press strokes.
Continued until N4 reaches 39.

In the meantime, if the operating oil pressure again exceeds the inching pressure Pi (S29), the inching operation, that is, step 37, is performed as described above.
And then to step 39.
Is added [S40]. Thereafter, the inching operation is performed as described above, and when the inching operation is completed, the process returns to step 3. As described above, the addition of N4 is also stopped during the second inching operation. And FIG. 6 (b)
As shown in FIG. 5, in this example, the inching operation is performed up to three times (see FIG. 5 (b)).
When 3 is confirmed, the process proceeds to step 31, and the addition in step 33 is repeated until N4 ≧ 39 in step 32 through step 32. Even if the inching pressure Pi is detected by the pressure sensor 33 during this time, it is ignored in step 36 and the addition of N4 is continued in step 33. If N4 ≧ 39 (S32), F2 is set to 5 in step 34 and the process returns to step 3, and the push plate 11 does not rotate forward any further.

When the inching operation is performed three times as described above, the count number N8 in the temporary ascent stroke Bc is 36 [6th
(See FIG. 2B.) In the case of two times, the number is 24. Needless to say, if the inching operation has never been performed, it is 0. By performing the inching operation in this way, even when the waste 34 is hard, the pressing position by the push plate 11 is made different, so that it is possible to search for a crushable place, and furthermore, the solid waste 34 is knocked down. The posture of the waste 34 can also be changed. By the way, in the case of the conventional apparatus in which the inching operation cannot be performed as in the present invention, the push plate 11 only rotates forward, and when the solid waste is encountered during the single forward rotation and the relief pressure Pj is reached. , The operation of the push plate 11 stops, and in the above example, N4 =
Long time from 22 to N4 ≧ 39, ie 39−22 = 17
The situation is such that the relief pressure Pj is maintained until the above count is obtained. However, in the present invention
If it is applied to N4 for a short time until N5 exceeds 7, ie, N4 = 22 + 7 = 29, the relief pressure Pj is released, and the time during which a large load acting on the fluid pump 17 and the cylinder 13 acts can be shortened. it can.

In the above example, the count number during the second and subsequent inching operations is not illustrated. However, as described in FIG. 6B, the count number N4 in the forward rotation stroke C is determined by the first inching operation. Is 22 and, for example, 4 counts until the start of the second time, that is, the detection of the next inching pressure Pi, is 22 + 4 = 26. If N4 has not reached 39 after three inching operations (S32), for example, N
If 4 = 35, the push plate 11 will only have the remaining count number, ie 3
The normal rotation stroke C is further taken by 9−35 = 4, and thereafter, the process moves to the rising stroke D. As shown in FIG. 5 (b), when the inching operation is performed three times, the ascending stroke D is already N8.
= 36, N8 of the predetermined ascent stroke D is, for example,
If it is set to 63, only the count number 27 is left. By the way, if it becomes lower than the inching pressure Pi by 7 after the detection of the inching pressure Pi and the counting of N5 is started, that is, as shown in FIG. 6 (c), it is lower than the inching pressure Pi when N5 = 5. When this happens, the state in which the inching operation is about to be performed is released, and the pressing plate 11 continues the secondary pressing as it is. Of course, if the inching pressure Pi is detected again, it goes without saying that the inching operation is started from that point.

Next, the operation in the normal ascent stroke D will be described. Depending on the number of inching operations, the rising stroke D is performed for the remaining amount. Therefore, the count number N8 in the ascent stroke D is
It is a multiple of N7, that is, any of 0, 12, 24, and 36. First,
Returning to step 3 in FIG. 7A, it is confirmed in step 24 that F2 is not 4 but 5 in step 35 [S35], and in FIG. 7G the solenoid SbA is demagnetized [S57]. ]. Then, it is determined whether or not the flag F4 = 1 (S58). Since F4 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 rising stroke D (S59),
The solenoid SaA is excited [S60]. That is, the push plate 11 indicated by a two-dot chain line in FIG.
Then, it is determined whether or not the push plate 11 has reached the count number 53 that rises along the guide surface 7 to the opening 4 of the packer 3 (S61). Jump to step 64 and return to step 3. In the same manner as above, the process returns to step 58, where the count number α based on the rotation of the fluid pump 17 is added, and N8 is increased [S59].

In this way, when N8 ≧ 53 in step 61, the eighth
(See the solid push plate 11 in FIG. 7E), the solenoid SbA is also excited [S63], and when N8 ≧ 53, the push plate 11
The pressing plate 11 enters the operation of the pressing stroke E (see FIG. 1) (see FIG. 8 (f)).
At this time, the return oil from the slide cylinder 14 is supplied to the piston side chamber 28 of the push plate cylinder 13, the extension of the slide cylinder 14 and the extension of the push plate cylinder 13 are performed simultaneously, and discarded by the push stroke E. The object 34 is completely pushed into the refuse storage box 1. And the indentation process E
Is continued until the count number N8 reaches 63. Steps
If N8 ≧ 63 at 62, the flag F4, which was 0, is set to 1 (S64). Further, the process returns to step 3 to reach step 58, and when F4 = 1 is confirmed, the flag F1 replaced with 2 in step 6 is set to 0 [S65]. Returning to step 3, F1 = 0 is confirmed, and the solenoids SaA and SbA are demagnetized as shown in FIG. 7 (a) [S66].

This completes one cycle of operation, but if it is necessary to repeat the next cycle [S67], step 1
Is returned to. On the other hand, if there is no need to enter the next cycle, this operation ends. Incidentally, in an apparatus which is set to automatically start the next cycle after completion of one cycle, the dust pushing mechanism performs the next operation continuously in step 67. In that case, the process returns to step 2 as indicated by the dashed line in FIG. 7 (a).

In the cycle movement of the dust pushing device described above, the time required for the operation of each stroke is performed by integrating the count number based on the pump rotation from the proximity step 31. A timer is used for control, for example, at step 37 in FIG.
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 ascent stroke D including the pushing stroke E in one cycle is described. However, the ascent stroke without the pushing stroke E may be employed. Further, the present invention is not limited to a cycle including four main strokes, and may be applied to, for example, a cycle including three strokes without a descending stroke or an ascent stroke in the present invention.

By the way, in the above-mentioned operation, the pushing plate 11 is moved down the stroke B.
When hard waste is encountered and the waste is hard to be crushed, the operation corresponding to the return stroke Cb and the temporary ascent stroke Bc in the forward rotation stroke C of the pushing plate 11 as described in the present invention is performed by the descending stroke B. May be performed.

[Brief description of the drawings]

FIG. 1 is a side view of the entire structure of a dust pushing device in a garbage 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 structure of a cycle movement mechanism. Fig. 4 is a schematic diagram of the operation command means, Fig. 5 (a) is an operation time chart of a solenoid operated in the case of crushable waste, and Fig. 5 (b) is waste having a hard pushing plate. 6 (a) to 6 (c), the operation time chart of the solenoid when the inching operation is repeated in response to
7 (a) to 7 (g) are flow charts of the cycle motion by the dust pushing device, and FIGS. 8 (a) to 8 (f) are the return stroke and the cycle motion in the cycle motion. It is an operation | movement state diagram of the push plate of each stroke including a pushing stroke. 1 ... garbage storage box, 3 ... packer, 10 ... slider, 11
… Push plate, 13… Cylinder for push plate, 14… Cylinder for slide, 29… Operation command means, 34… Waste, Bc…
… Temporary ascent stroke, C …… Forward stroke (secondary press), Ca…
… Pressing stroke, Cb… Return stroke, G… Position where the working oil pressure rises sharply, H… End position of pressing stroke, K…
End position of return journey.

Continuation of the front page (72) Inventor Tatsuo Ikeda 6-1-145 Koshienguchi, Nishinomiya-shi, Hyogo Far East Development Industry Co., Ltd. (56) References JP-A-60-188202 (JP, A) JP-A-62- 269802 (JP, A)

Claims (1)

(57) [Claims] 1. A slider mounted inside a packer connected to a rear part of a refuse storage box and raised and lowered by a slide cylinder, and a pusher pivotally supported by the slider and rotated forward / reversely by a pusher plate cylinder. A dust control device for controlling the plate, the slide cylinder and the push plate cylinder to cause the push plate to perform a cycle movement, wherein the push plate performs a secondary press of the waste put in the packer. From the position where the operating oil pressure suddenly rises in the push plate cylinder by pressing the hard waste with, the push plate is temporarily pressed in the secondary press direction as the operating oil pressure rises The pressing process is further shifted to a pressing process for further pressing the waste, and when a predetermined time period of the pressing process in a state where the operating oil pressure is increased ends, the pressing plate is moved from the end position of the pressing process to the correct position. A return stroke for partially retreating the rolling stroke is performed for a predetermined time, a temporary ascent stroke temporarily rising from the end position of the return stroke is performed for a predetermined time, and secondary press is performed again from the end position of the temporary ascent stroke. The process is shifted to a forward rotation stroke, and thereafter, every time the operating oil pressure in the push plate cylinder suddenly increases, an inching operation including the pressing stroke, the return stroke, and the temporary rising stroke is sequentially performed, and the inching operation is performed. A dust pushing control device for a garbage truck, characterized in that the pushing plate is provided with an operation command means for completing the remaining forward rotation stroke after completion.