JPS61211203A - 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 has been constructed by connecting a hydraulic cylinder to a compression pushing plate for pushing the garbage, and connecting this hydraulic cylinder to a 4-hour pressure pump driven by an ENON via an electromagnetic switching valve. Widely used are electromagnetic switching valves in which the solenoid is energized to perform a series of cycle operations.

Previously, the present inventors proposed a drive control device in Japanese Patent Publication No. 59-30601 that efficiently pushes this type of garbage pushing device in accordance with the rotational speed of a hydraulic pump.

In this drive control device, as shown in FIG.
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. As shown in FIG. 4, the switching control device 26 includes a counting circuit that counts an electrical signal representing the rotation speed of the hydraulic pump 23 inputted from the proximity sensing device 24, and a counter circuit in which this count value is set in advance. Output circuits N, , N, , N3 . which respectively output signals when the rotation speed is reached. N, and in response to these output signals, the respective solenoids S4. St.
Output holding circuits M, , M, which excite and demagnetize S3゜S,.

M3. Consists of M. As shown in the figure, the output circuit group N and the output holding circuit group M are excitation signal lines a, b, c, d and demagnetization signal lines e, r, g, h, 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. If the set rotational values of Nt, N3, and N4 are, for example, 1, 75, 146, and 200, respectively, the operation of the output holding circuit group M as the count value of the counter circuit (actual rotational speed of the hydraulic pump) increases n becomes as follows. When nh<I, the solenoid S is excited from the output circuit NI via the excitation signal line a and the output holding circuit M, and when n reaches 75, the solenoid S is excited from the output circuit N through the demagnetizing signal line e and the output holding circuit M1. ．． The solenoid S is deenergized, the solenoid S is energized, and the solenoid S3 is energized through the excitation excitation line and the output holding circuit Mt, and the excitation signal line C and the output holding circuit M3, and when n becomes 146,
The output circuit N3 is connected to the solenoid S via the demagnetizing signal line g, the output holding circuit M3, the excitation signal line d and the output holding circuit M4, respectively.
3 is demagnetized, solenoid S4 is energized, and when n reaches 200, a demagnetization signal is sent from output circuit N4 to solenoid S via return line and output holding circuit M4.

is demagnetized and the coefficient circuit is cleared to zero (n=0) via the zero clear line i, 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
, and is further connected to a connecting pipe 29.
Another electromagnetic switching valve 2 with solenoid S1゜S2 via
8°, and this electromagnetic switching valve 28' is connected to an oil sump 31 through 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 oil reservoir 31. The electromagnetic switching valve 28 is connected to the piston side chamber 36 and the rod side chamber 37 of the first hydraulic cylinder 35 via a conduit 33.34, respectively, and the electromagnetic switching valve 28° is connected to the second hydraulic cylinder 35 via a conduit 38.39. It is connected to a piston side chamber 36° and a rod side chamber 37°, respectively. The first hydraulic cylinder 3
The tip of the piston rod 40 of No. 5 is connected to the base 41a of the compression pushing plate 41 with a pin, and is connected to the second hydraulic cylinder 35.
The piston rod 40° is connected to the tip 41b of the compression pushing plate 41 via a link 42, and one end is connected to a garbage disposal box (not shown) at the connection between the piston rod 40'' and the link 42. ) Link 4 pivoted to 44
The tips of 3 are connected.

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

(a) Return stroke l≦n 75 Only the solenoid S1 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.
Solenoid switching valve 28°, second hydraulic cylinder 3 via conduit 38
5° is supplied to the piston side chamber 36°, the piston rod 40' protrudes to the most extended position, and the compression pushing plate 41 is rotated upward around the base 41a via the link 42.43 to prepare for the input of garbage. .

(b) Compression stroke 75≦n<146, the solenoids S and S are energized, and the hydraulic oil flows into the piston side chamber 36 of the first hydraulic cylinder 35, then into the second hydraulic cylinder 35 as shown by the arrow.
Supplied to the rod side chamber 37° of the hydraulic cylinder 35°,
The piston rod 40 protrudes to the most extended position, while the piston rod 40° retracts to the most contracted position, and the compression pushing plate 4! is lowered through the piston rod 40 and links 42 and 43 while maintaining a substantially horizontal state, and compresses the thrown-in garbage.

(c) Pushing stroke 146≦n <200 Solenoid S
Only the piston rod 4 is excited, and hydraulic oil is supplied to the rod side chamber 37 of the first pressure cylinder 35 as shown by the arrow.
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 cleared to zero (nL10), one cycle of operation 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 work quickly, and in such a case, there is a risk of personal injury such as the worker being caught in the pushing device. Furthermore, when the garbage collection vehicle is rented, the rental company has a strong desire 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 stop the operation of a garbage pushing device when the engine and hydraulic pump rotate at a predetermined speed or higher.

<Means for Solving the Problems> In order to achieve the above object, the configuration of the drive control device of the present invention is based on the count value per unit time of the electrical signal representing the rotation speed of the hydraulic pump input from the proximity sensing device. However, the present invention is characterized in that a signal control device is provided which sends the electrical signal to the switching control device if it is less than the set value, and stops the operation of the switching control device if it is equal to or greater than the set value.

Function> If the number of revolutions of the hydraulic pump per unit time is less than the set number of revolutions per unit time, the signal control device sends a signal representing the number of revolutions of the hydraulic pop 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.

On the other hand, when 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 operation of the switching control device is stopped, the electromagnetic switching valve is not switched, and the operation of the garbage pushing device is also stopped.

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

Figure 1 shows a garbage collection vehicle, l is the body frame, 2 is the 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. Switches 6 and 7 are push switches and stop switches provided on the outer surface of the garbage storage box 3, and 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 hydraulic cylinder of 35 degrees (see FIG. 2), and these structures are exactly the same as the garbage pushing device described in FIG.

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 9, and the garbage in the garbage storage box 2 is discharged to the outside. ing. 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. Further, in the electrical system shown on the right side of FIG. 2, 24 is the proximity sensing device described above, and 26 is the switching control device having the same configuration as in FIG. 4.

A signal control device 10 is provided between the proximity sensing device 24 and the switching control device 26. This signal control device 10 calculates the number of revolutions per unit time of an electric signal representing the number of rotations of a hydraulic pump which is manually input from a proximity sensing device 24 via a counting circuit L (see FIG. 4) of a switching control device 26 and counted. The numerical value is compared with the set value input from the upper limit rotation speed setter II, and if the counted value is less than the set value, the electrical signal continues to be sent to the switching control device 26, and if the counted value is greater than the set value, the alarm is activated. 1
2 and the base of the power transistor 13. The switching control device 26 connects the terminal (+) to the aforementioned operation switch 5. Push switch6. Power is supplied directly through the normally closed stop switch 7 and the emitter and collector of the power transistor 13, and this DC power can be switched to the discharge device side I4 by the operation switch 5. Stop switch 7 and power transistor 1
A well-known engine constant rotation device 15 is connected from the (+) side to the (-) side of the DC power source between the two, and this device 15 provides the optimum hydraulic pump rotation speed for pushing the garbage even if the accelerator pedal 8 is not depressed. The engine rotation is controlled at a constant speed. When the power transistor I3 receives an output signal from the signal control device 10, it cuts off the emitter and the collector to turn off the power to the switching control device 26. Further, the alarm device 12 receives an output signal from the signal control device 10 and uses a buzzer or lamp to notify that the hydraulic pump is rotating at a high speed higher than a set value.

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 pop 23. The rotation speed of the hydraulic pump 23 is converted into an electrical signal by the proximity sensing device 24, and this electrical signal is sent to the signal control device I.
The signal is inputted to the counting circuit of the switching control device 26 via O and counted.

The upper limit rotation speed setting value of the hydraulic pump is preset in the upper limit rotation speed setting device 11 according to the type of garbage and the request of the operator. Then, the signal control device 10 compares the count value per unit time of the electrical signal counted by the counting circuit with the set value, and if the counted value is less than the set value, the signal control device 10 switches the electrical signal to the switching control device. The device 26 operates in the same manner as described in FIG. The hydraulic system consisting of this performs the same operation as described in FIG. 5, and the garbage pushing device 4 repeats a predetermined cycle operation consisting of return-compression-pushing depending on the rotational speed of the hydraulic pump. On the other hand, the operator presses the accelerator pedal 8.
is depressed to rotate the engine and therefore the hydraulic pump 23 at high speed, and when the count value exceeds the set value, the signal control device 10 outputs a signal to the alarm 12 and the base of the power transistor 13. Then, the power transistor 13 cuts off the emitter and collector to turn off the power to the switching control device 26, and the count value of the counting circuit in the switching control device 26 becomes zero. Thereby, solenoids Sl, S
t, S3, and S4 are all demagnetized, and the electromagnetic switching valves 28.
28° takes a neutral position, the hydraulic oil circulates under no load through the pump 23, discharge pipe 27, connecting pipe 29, return pipe 30, and oil reservoir 31, and the dust pushing device 4 stops operating. Alarm I at the same time
2 receives an output signal from the signal control device IO and uses a buzzer or lamp to notify that the hydraulic pump is rotating at a higher speed than a set value. Note that repowering of the switching control device 26 whose power has been turned off in this manner is performed by pressing a reset button (not shown) in the signal control device 10. Further, in an emergency, the normally closed stop switch 7 can be opened to stop the garbage pushing device 4. Further, when the operation switch 5 is switched to the discharge device side 14, 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 embodiment described above, since the alarm 12 is provided, the operator can immediately know when the hydraulic pump rotates at a high speed exceeding the set value E and the switching control device 26 is turned off.

In the embodiment L, 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 II. good. Further, the signal control device 10 switches the count value of the electric signal representing the rotation speed of the hydraulic pump to the control device 2.
6, however, a counting circuit may be provided in the signal control device itself.

<Effects of the Invention> As is clear from the above explanation, the driving device of the garbage pushing device of the present invention is capable of detecting a problem from the proximity sensing device if the number of revolutions of the hydraulic popper per unit time is less than the set number of revolutions per unit time. It is equipped with a signal control device that sends the output signal of This prevents the hydraulic system and mechanical parts of the garbage pushing device from operating and causing damage to them due to stress, and there is no possibility of personal injury caused by high-speed operation of the garbage pushing device.

[Brief explanation of drawings]

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, lO... Signal control device, 11. Upper limit rotation speed setting device, 12...
Alarm device, 13... Power transistor, 23... Hydraulic pump, 24... Proximity sensing device, 26... Switching control device, 28.28' ・Electromagnetic switching valve, 35, 35° ・
・Hydraulic cylinder, S,, S,, S,, S,...-Solenoid. Patent applicant: Kyokuto Kaihatsu Kogyo Co., Ltd. Agent: Patent attorney Maeda Uo and 2 others $3 Figure 2J4

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 the above is the case, then there is provided a drive control device for a garbage pushing device, characterized in that a signal control device for stopping the operation of the switching control device is provided.