JPS61211204A - Driving controller for garbage push-in device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention mainly relates to a drive control device for a garbage pushing device installed in a vehicle.

<Prior Art> Conventionally, a garbage pushing device connects a hydraulic cylinder to a compression pushing plate for pushing garbage, and connects this hydraulic cylinder to a hydraulic pump driven by an engine via an electromagnetic switching valve. Widely used are electromagnetic switching valves in which a solenoid is energized to perform a series of cycle operations.

Once upon a time, the inventors of the present invention published a patent application for the Special Publication No. 59-3060! In this issue, we proposed a drive control device that efficiently pushes this type of garbage pushing device according to the rotational speed of a hydraulic pump.

As shown in FIG. 3, this drive control device includes a drive shaft 22 connected to a power extraction device 21 of the engine, or a hydraulic pump 23.
while the proximity sensing device 24 rotates the drive shaft 22.
The rotation of the proximity plate 25 fixed to the switch is sensed, and an electric signal corresponding to the rotation speed is output to the switching control device 26. The switching control device 26, as shown in FIG.
a counting circuit that counts electrical signals representing the number of revolutions of N0., and an output circuit that outputs signals when the counted value reaches each preset number of revolutions. N2. N3, N4, and each solenoid S receives these output signals.
,,S,,S,.

Energize S4, /l! l magnetic output holding circuit Ml, M2
.

N3. Consists of M. The output circuit group N and the output holding circuit group M are connected to excitation signal lines a, b, c, d and demagnetization signal lines e, f, g, h as shown in the figure, and the output circuit N4 and the counting circuit are connected to a zero clear line i. The entire switching control device 26 is connected to a DC power source.

The above output circuit N1. For example, if the set rotational values of N2, N, l, and N4 are 1, 75, 146, and 200, respectively,
The operation of the output holding circuit group M as the count value of the counting circuit (actually measured rotational speed of the hydraulic pump) n increases is as follows. When n becomes 1, the solenoid Sl is excited from the output circuit N1 via the excitation signal line a and the output holding circuit M, and when n becomes 75, the output circuit N1 is connected to the demagnetizing signal line e and the output holding circuit. M1
．． Excitation excitation line and output holding circuit M2. Through the excitation signal line C and the output holding circuit M3, the solenoid Sl is demagnetized, the solenoid S is energized, the solenoid S is energized, and the solenoid S is energized.
When becomes 146, the solenoid S is transmitted from the output output circuit N3 through the demagnetizing signal line g, the output holding circuit M3, the excitation signal line d and the output holding circuit M4.
3 is demagnetized, solenoid S4 is excited, and when n reaches 200, a demagnetization signal is sent from the output circuit N4, and the solenoid S4 is demagnetized via the bus line and the output holding circuit M4, and the coefficient circuit is sent via the zero clear line i. is cleared to zero (n = 0), completing one cycle of operation.

FIG. 5 shows such solenoids S,,S,.

S3. It shows a hydraulic system switched by an electromagnetic switching valve with S4 and a dust pushing device driven and controlled by the hydraulic system. The discharge pipe 27 of the hydraulic pump 23 is connected to the solenoid S3. S
4, and is further connected to a connecting pipe 29.
via solenoid S+.

This electromagnetic switching valve 28° is connected to a tank 31 via a return pipe 30. A relief valve 32 is provided in the middle of the discharge pipe 27, which opens when the hydraulic pressure in the pipe exceeds a predetermined pressure and returns the hydraulic oil to the tank 31.

The electromagnetic switching valve 28 is connected to the piston side chamber 36 and the rod side chamber 37 of the first hydraulic nolinder 35 via conduits 33.34, respectively, and the electromagnetic switching valve 28° is connected to the second Id] pressure cylinder via a conduit 38.39.・Piston side chamber 36 with a diameter of 35 degrees
° and rod side chamber 37°, respectively. The tip of the piston rod 40 of the first hydraulic cylinder 35 is connected to the base 41a of the compression pushing plate 41 with a pin, and
The piston rod 40' of the hydraulic cylinder 35' is connected to the tip 41b of the compression pushing plate 41 via a link 42, and the piston rod 40' and the link 42 are connected to each other.
The tip of a link 43 whose one end is pivoted 44 to a garbage disposal box (not shown) is connected to the connection portion.

The operating process of the dust pushing device having the above structure will be described as follows based on the solenoid excitation cycle described above with reference to FIG.

(a) Return stroke 1≦n 75 Only the solenoid Sl is energized, and the hydraulic oil is discharged from the hydraulic pump 23 to the discharge pipe 27° to the connecting pipe 29. as shown by the arrow in the figure.
It is supplied through the electromagnetic switching valve 28° and the conduit 38 to the piston side chamber 36° of the second pressure cylinder 35°, and the piston rod 40° protrudes to its most extended position, and the compression push plate 4
1 is pivoted upwardly around the base 41a via links 42, 43, ready for the introduction of garbage.

(b) Compression stroke 75≦n <146 Solenoid S3
and 82 are excited, and the hydraulic oil flows into the biston side chamber 36 of the first hydraulic cylinder 35 as shown by the arrow, and then into the second pressure cylinder 3.
5'' is supplied to the rod side chamber 37°, the piston rod 40 protrudes to the most extended position, while the piston rod 40'' retracts to the most retracted position, and the compression pushing plate 41 It descends while maintaining a nearly horizontal position and compresses the thrown-in garbage.

(c) Pushing stroke 146≦n <200 Solenoid S
, is excited, hydraulic oil is supplied to the rod side chamber 37 of the first hydraulic cylinder 35 as shown by the arrow, and the piston rod 4
0 is retracted to the most contracted position, the compression pushing plate 41 rotates to the left front via the piston rod 40 and links 42, 43, and pushes the compressed garbage into a garbage storage box (not shown).

When n=200, the count value is zeroed to zero gamma rays (nL10), the operation of the (2) cycle is completed, and the same cycle is repeated again.

As described above, the drive control device proposed by the present inventors efficiently operates the garbage pushing device according to the rotation speed of the hydraulic pump.

<Problems to be Solved by the Invention> However, the drive control device described above has a structure in which the operating cycle of the garbage pushing device becomes shorter as the hydraulic pump rotates at a higher speed, so when pushing the garbage, it is usually kept at a constant rotation speed. When the accelerator pedal is depressed to make the engine rotate at high speed, there is a problem in that the high-speed operation of the pushing device repeatedly applies abnormal force to the hydraulic system and mechanical parts, causing damage to them.

Further, the worker often depresses the accelerator in an attempt to finish the pushing operation quickly, and in such a case, there is a risk that the worker may be caught in the pushing device, resulting in a personal injury. Furthermore, if the garbage collection vehicle is rented, there is a strong desire by the rental company to protect the pushing device from harsh use by the renter. Therefore, it is absolutely necessary to operate the dust pushing device at a speed below a predetermined speed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drive control device that can operate a garbage pushing device at a speed corresponding to a predetermined hydraulic pump rotation speed even if the engine and hydraulic pump rotate at a high speed higher than a predetermined speed.

<Means for Solving the Problems> In order to achieve the above object, the configuration of the drive control device of the present invention is such that the unit time The number of revolutions of the hydraulic pump per unit time is compared with the set number of revolutions per unit time, and if the number of revolutions of the hydraulic pump per unit time is less than the set number of revolutions per unit time, the output from the proximity sensing device is determined. A signal is sent to the switching control device, and if the number of revolutions of the hydraulic pump per unit time is equal to or greater than the set number of revolutions per unit time, the switching control device sends a signal representing the same number of revolutions as the set number of revolutions per unit time. The present invention is characterized by the provision of a signal control device for sending signals to the device, and a bypass circuit that is opened when the piston of the hydraulic cylinder reaches the stroke end and causes the pressure oil to flow back to the tank side through a check valve.

<Function> When the number of rotations of the hydraulic pump per unit time is less than the set number of rotations per unit time, the signal control device sends a signal representing the number of rotations of the hydraulic pump output from the proximity sensing device to the switching control device. . The switching control device counts the above-mentioned signals, compares the counted value with a predetermined rotation speed set in advance, and when they match, outputs a signal and switches the electromagnetic switching valve to extend and retract the hydraulic cylinder. , whereby the compression pushing plate is driven in cycles, and the garbage pushing device repeats a predetermined cycle operation according to the rotational speed of the hydraulic pump.

Next, if the number of revolutions of the hydraulic pump per unit time is equal to or higher than the set number of revolutions per unit time, the signal control device sends a signal representing the same number of revolutions as the set number of revolutions per unit time to the switching control device. . The switching control device switches the electromagnetic switching valve in the same manner as described above based on the count value of the above signal, but even if the hydraulic pump is rotating at a high speed higher than the set rotation speed, the signal input per unit time is the set rotation speed. Since the number is the same as the number, the cycle of the switching operation is the same as when the hydraulic pump is rotating at the set rotation speed, and therefore the operating speed of the garbage pushing device is maintained at the set speed. On the other hand, due to the signal representing the rotation speed of the high-speed hydraulic pump, the piston of the hydraulic cylinder reaches the end of its stroke and stops long before the electromagnetic switching valve switches to the next step. The bypass circuit having the above-mentioned bypass circuit is opened, and the supplied pressure oil is returned to the tank side through the check valve of the bypass circuit.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

Figure 1 shows a garbage collection vehicle, 1 is the vehicle body frame, 2 is the vehicle body frame l
3 is a garbage disposal box installed at the rear of the garbage storage box 2; 4 is a garbage pushing device installed in this garbage disposal box 3; 5 is an operation for switching between pushing and discharging garbage. The switch 6.7 is a push switch and a stop switch provided on the outer surface of the garbage storage box 3, and the reference numeral 8 is an accelerator pedal of the garbage collection vehicle.

The garbage pushing device 4 includes a compression pushing plate 41 and a first compressing plate 41 whose base portion 41a is driven by a piston rod 40.
The hydraulic cylinder 35 and the second piston rod are driven by a piston rod 40° via a link 42 and a link 43 whose one end is pivoted 44 to the garbage disposal box 3, and the tip end 41b of the compression pushing plate is
It consists of a pressure cylinder 35' (see Fig. 2), and the structure thereof is exactly the same as that of the garbage pushing device described in Fig. 5.

When the operation switch 5 is switched to the discharge side, a discharge device (not shown) rotates the garbage disposal box 3 upward around the pivot point 9, and discharges the garbage in the garbage storage box 2 to the outside. . Further, the output of the engine adjusted by the accelerator pedal 8 rotates the hydraulic pump 23 through the drive shaft 22, as shown in FIG. The rotation of the motor is sensed and an electric signal corresponding to the rotation speed is output to the switching control device 26.

FIG. 2 is a schematic diagram of a drive control device consisting of a hydraulic system for driving the garbage pushing device 4 and an electrical system for controlling it. The configuration of the hydraulic system is exactly the same as that described in FIG. 5, and the same reference numerals are given to the same structural members and the explanation thereof will be omitted. The first hydraulic cylinder 35 has a rod side chamber 37 near the stroke end of the piston when the rod 40 is retracted.
1 to conduit 33 via check valve 9 and rod 4
Bypass circuits are provided from the piston side chamber 36 near the stroke end of the piston when the piston is extended to zero, to the conduit 34 via the check valve 10. Similarly, the second hydraulic cylinder 3
Also at 5°, a bypass circuit is provided to the conduit 38 via the check valve 9' and to the conduit 39 via the check valve l0°. In the electrical system shown on the right side of Figure 2, 2
4++ The proximity sensing device 26 is the switching control device having the same configuration as that shown in FIG. A signal control device 1.1 is provided between the proximity sensing device 24 and the switching control device 26. This signal control device 11 receives an electric signal (representing the rotational speed of the hydraulic pump) which is input from the proximity sensing device 24 through the counting circuit L (see FIG. 4) of the switching control device 26 and counted.
Compare the counted value per unit time of pulses) with the set value input from the upper limit rotation speed setter 12. If the counted value is less than the set value, send the above electrical signal as it is to the switching control device 26, and output the counted value. If the value exceeds the set value, human power to the electric signal switching control device 26 is stopped, that is, only the same number of electric signals as the set value are sent to the switching control device 26 per unit time, and a signal is output to the alarm 13. It is supposed to be done. Upon receiving this signal, the alarm 13 notifies the user with a buzzer or lamp that the hydraulic pump is rotating at a higher speed than the set value. The switching control device 26 is supplied with DC power from the terminal (+) through the aforementioned operation switch 5, push switch 6, and normally closed stop switch 7, and this DC power can be switched to the discharge device side 14 by the operation switch 5. Can be done. DC power supply (+) between the stop switch 7 and the switching control device 26
A well-known engine constant rotation device 15 is connected from the ) side to the (-) side, and this device! 5 controls the rotation of the engine at a constant speed so as to provide the optimum hydraulic pump rotation speed for pushing in dust even if the accelerator pedal 8 is not depressed.

The operation of the drive control device for the dust pushing device having the above configuration will be described below.

First, when the - operation switch 5 is switched to the garbage pushing device side and the push switch 6 is closed, the engine, which is rotated at a constant speed by the engine constant rotation device 15, rotates the hydraulic pump 23. The rotation speed of the hydraulic pump 23 is converted into an electric signal by the proximity sensing device 24, and this electric signal is sent to the signal control device 1.
1, and is manually counted by the counting circuit of the switching control device 26.

The upper limit rotational speed setting value of the hydraulic pump is preset in the upper limit rotational speed setting device 12 according to the type of garbage and the request of the operator. Then, the signal control device 11 compares the count value per unit time of the electric signal counted by the counting circuit with the set value, and if the count value is less than the set value, switches the electric signal to the control device 26. Send it as is. Then, the switching control device 26 operates in the same manner as described in FIG. Then, the dust pushing device 4 repeats a predetermined cycle operation consisting of returning, compressing, and pushing in accordance with the rotational speed of the hydraulic pump. On the other hand, when the operator depresses the accelerator pedal 8 to rotate the engine and hence the hydraulic pump 23 at high speed, and the above-mentioned count value exceeds the above-mentioned set value, the signal control device If switches the electric signal input from the proximity sensing device 24. At the same time as stopping the supply to the control device 26, a signal is output to the alarm device 13. As a result, the switching control device 26
In one step of the 1 cycle, only the same number of electric signals as the set value are applied manually per unit time, and as will be described later, the operating speed of the compression pushing plate 41 is prevented from becoming excessive. . Further, the alarm device 13 receives the above output signal and notifies the user with a buzzer or a lamp that the hydraulic pump is rotating at a higher speed than a set value. The switching control device 26 controls the electromagnetic switching valves 28 and 28 at the same frequency as when the hydraulic pump 23 is rotating at the set rotational speed in response to the electrical signal.
The operating speed of the dust pushing device 4 is maintained at the set speed. However, the hydraulic pump 23 rotating at high speed
Since the amount of pressure oil supplied to the hydraulic cylinders 35° and 35° increases, the pistons of each hydraulic cylinder are controlled by the solenoid switching valve 28.28° sequence! The end of the stroke is reached within a very short period of time corresponding to the step.

For example, when only the solenoid S4 of the electromagnetic switching valve 28 is energized, pressure oil is supplied to the rod side chamber 37 of the hydraulic cylinder 35 through the conduit 34, and the piston rod retracts and reaches the stroke end, the solenoid S4 is Since the electromagnetic switching valve 28 is still in the excited state, the switching operation is not yet performed, and excessive pressure oil is supplied to the rod side chamber 37. However, at this time, since the bypass circuit including the check valve 9 is opened to the rod side chamber 37 side, the pressure oil is bypassed to the tank side conduit 33 via the check valve 9.

The same applies to the other check valves 10.9 and 10, and the pressure oil supplied from the time the piston reaches the stroke end until the electromagnetic switching is activated is returned to the conduit on the tank side, respectively, and is returned to the hydraulic cylinder 35. Excessive pressure is not applied to the 35° or the conduit, and the power loss of the hydraulic pump 23 can also be minimized. When the operator notices the buzzer or lamp of the alarm 13 and stops depressing the accelerator pedal 8, the garbage pushing device 4 is activated by the hydraulic pump 23-gate 4-
4- out, -, 4-1, -+p JrL c4y 'e
+ +-: &h -FI Ikv ff, k l
IJ- and lamps will stop. Further, in an emergency, the normally closed stop switch 7 can be opened to stop the garbage pushing device 4. Furthermore, the operation switch 5 is moved to the discharge device side 14.
When switched to , the garbage disposal box 3 is rotated upward around the pivot point 9, and the garbage in the garbage storage box 2 is discharged to the outside.

In the above embodiment, since the alarm 13 is provided, the operator can know from the buzzer or lamp that the hydraulic pump 23 is rotating at a higher speed than the set value, and immediately stop pressing the accelerator pedal 8. be able to. Further, since the upper limit rotational speed setting device 12 is provided, the upper limit operating speed of the garbage pushing device 4 can be set variously depending on the type of garbage and the request of the operator.

In the above embodiment, the rotation speed control of the engine constant rotation device 15 is fixed at a constant speed, but this control speed may be changed in conjunction with the setting value of the upper limit rotation speed setting device 12. . Further, when the count value in the switching control device 26 becomes equal to or greater than the setting value in the upper limit rotation speed setting device 12, the signal control device 11 sends an electric signal after the setting value manually input from the proximity sensing device 24 in each unit time. However, from the electrical signals input from the proximity sensing device 24 in each unit time, the electrical signals corresponding to the difference between the count value and the set value are evenly thinned out. The same number of electrical signals as the set value may be sent to the switching control device 26 per unit time. Further, the proximity sensing device does not matter whether it is a digital type or an analog type. Further, although the signal control device 11 receives the count value of the electric signal representing the rotation speed of the hydraulic pump from the switching control device 26, the signal control device itself may be provided with a counting circuit.

<Effects of the Invention> As is clear from the above explanation, the drive device of the garbage pushing device of the present invention detects the noise from the proximity sensing device if the number of revolutions of the hydraulic pump per unit time is less than the set number of revolutions per unit time. a signal control device that sends an output signal to the switching control device, and sends a signal representing the same number of rotations as the set rotation speed per unit time to the switching control device if the rotation speed is equal to or greater than the set rotation speed per unit time; The system is equipped with a bypass circuit that opens when the piston reaches the end of its stroke and allows the pressure oil to flow back to the tank via a check valve.This prevents the compression plate from operating at a higher speed than the set value, preventing overloads and personal accidents. Danger is prevented, power loss in the hydraulic system of the garbage pushing device is minimized, and no stress is applied to the hydraulic system or mechanical parts causing damage to them.

[Brief explanation of the drawing]

Fig. 1 is a side view of a garbage collection vehicle equipped with the drive control device of the present invention, Fig. 2 is a schematic diagram of the drive control device, and Fig. 3 is a rotation speed sensor of a hydraulic pump previously proposed by the present inventors. FIG. 4 is an electric circuit diagram of a control device connected to the rotation speed sensing portion of FIG. 3, and FIG. 5 is an operational diagram of a drive control device previously proposed by the present inventors. 2... Garbage storage box, 4... Garbage pushing device, 9.9'
. to, to'... Check valve, 11... Signal control device, 12... Upper limit rotation speed setter, 13... Alarm, 23... Hydraulic pump, 24... Proximity sensing device, 2
6...Switching control device, 28.28°...Solenoid switching valve, 31...Tank, 35.35°...Hydraulic cylinder, Sl, St. S,,S,... Solenoid. Patent applicant Kyokuto Kaihatsu Kogyo Co., Ltd. Representative Patent attorney 2 people Figure 3 Figure 4

Claims (1)

[Claims] (1) A hydraulic cylinder that drives a compression plate that pushes garbage into a garbage storage box is connected to a hydraulic pump via an electromagnetic switching valve, and receives an output signal from a proximity sensing device that detects the rotation speed of this hydraulic pump. In the garbage pushing device, the electromagnetic switching valve is switched and controlled to extend and retract the hydraulic cylinder based on an output signal from a switching control device that compares the rotation speed of the hydraulic pump with a preset predetermined rotation speed. The number of revolutions of the hydraulic pump per unit time created based on the signal representing the number of revolutions of the hydraulic pump output from the sensing device is compared with the set number of revolutions per unit time. If the number of revolutions of the hydraulic pump is less than the set number of revolutions per unit time, an output signal from the proximity sensing device is sent to the switching control device, and the number of revolutions of the hydraulic pump per unit time becomes the set number of revolutions per unit time. If this is the case, a signal control device sends a signal representing the same number of rotations as the set rotation speed per unit time to the switching control device, and a check valve that is opened when the piston of the hydraulic cylinder reaches the stroke end to check the pressure oil. A drive control device for a garbage pushing device, characterized in that it is provided with a bypass circuit that allows the flow to flow back to the tank side through the flow.