CN113156883A

CN113156883A - Hydraulic electric control device of garbage transport vehicle based on PLC control

Info

Publication number: CN113156883A
Application number: CN202110454650.3A
Authority: CN
Inventors: 齐瑞浩; 戚业凤; 杨大伟; 徐淑杰; 何文艳
Original assignee: Haihui New Energy Motor Co Ltd
Current assignee: Haihui New Energy Motor Co Ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-07-23

Abstract

The invention provides a hydraulic electric control device of a garbage transport vehicle, which comprises a storage battery and a PLC (programmable logic controller), wherein the positive electrode of the storage battery is connected with the corresponding input end of the PLC through a selection control device, a power supply control device is connected between the corresponding output end of the PLC and the negative electrode of the storage battery, the power supply control device is also connected with the positive electrode of the storage battery and is simultaneously connected with an actuating mechanism control device in series, and the actuating mechanism control device is connected with the negative electrode of the storage battery; the battery corresponds the temperature-detecting device that concatenates between the input with the PLC controller, be connected with high temperature alarm indicator between the output that the PLC controller corresponds and the battery negative pole, the battery, the oil pump motor, oil pump relay normally closed contact establishes ties, the oil pump relay normally closed contact other end corresponds the output with the PLC controller and is connected, oil pump relay coil both ends correspond output and battery negative pole with the PLC controller respectively and are connected, the oil pump relay normally open contact other end is connected with the battery negative pole.

Description

Hydraulic electric control device of garbage transport vehicle based on PLC control

Technical Field

The invention relates to a hydraulic electric control device of a garbage transport vehicle based on PLC control, belonging to the technical field of electric control of garbage transport vehicles.

Background

The pure electric garbage collection and transportation vehicle can intensively load garbage, transport the garbage to a transfer station for subpackage treatment, and has no secondary pollution in the transportation process. The garbage truck is provided with a lifting bucket mechanism, a box body turnover mechanism, a tail support and other mechanisms, and corresponding control parts are required to be configured respectively so as to load and unload garbage. In the vehicle model on the market, the oil pump motor usually adopts a direct current motor, and the direct current motor does not have a driving controller and works when being electrified. However, without the participation of the controller, when the motor is in overcurrent or high temperature, the motor still works in fatigue, so that potential safety hazards exist, and the phenomenon of burning out the motor also occurs. Meanwhile, the operation convenience is poor, and the low automation control degree is another problem. .

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a hydraulic electric control device of a garbage transport vehicle based on PLC control, and the specific technical scheme is as follows:

the hydraulic electric control device of the garbage transport vehicle based on PLC control comprises a 24v storage battery and a PLC controller, wherein the positive pole of the 24v storage battery is connected with the corresponding input end of the PLC controller through a selection control device, a power supply control device is connected between the corresponding output end of the PLC controller and the negative pole of the 24v storage battery, the power supply control device is also connected with the positive pole of the 24v storage battery and is simultaneously connected with an actuating mechanism control device in series, and the actuating mechanism control device is connected with the negative pole of the 24v storage battery; concatenate the temperature-detecting device who is used for detecting oil pump motor temperature between the input that 24v battery and PLC controller correspond, be connected with high temperature alarm indicator between the output that the PLC controller corresponds and the negative pole of 24v battery, the positive pole and the oil pump motor of 24v battery are connected, the oil pump motor is connected with oil pump relay's normally closed contact, oil pump relay's normally closed contact's the other end is connected with the output that the PLC controller corresponds, oil pump relay's coil both ends are connected with the output that the PLC controller corresponds and the negative pole of 24v battery respectively, oil pump relay is equipped with normally open contact, oil pump relay's normally open contact and the same binding post of normally closed contact sharing, oil pump relay's the other end of normally open contact and the negative pole of 24v battery are connected.

Preferably, the selection control device comprises a top cover opening switch, a top cover closing switch, a lifting machine lifting switch, a lifting machine lowering switch, a supporting rod lifting switch, a supporting rod lowering switch, a box lifting switch and a box return switch, wherein the top cover opening switch, the top cover closing switch, the lifting machine lifting switch, the lifting machine lowering switch, the supporting rod lifting switch, the supporting rod lowering switch, the box lifting switch and the box return switch are arranged in parallel.

Preferably, the selection control device further comprises a one-key loading switch and a one-key unloading switch, and the one-key loading switch and the one-key unloading switch are arranged in parallel.

Preferably, the power control device comprises a top cover opening relay, a top cover closing relay, a lifting machine lifting relay, a lifting machine lowering relay, a support rod lifting relay, a support rod lowering relay, a box lifting relay and a box return relay, wherein the two ends of a coil of the top cover opening relay, the top cover closing relay, the lifting machine lifting relay, the lifting machine lowering relay, the support rod lifting relay, the support rod lowering relay, the box lifting relay and the box return relay are respectively connected with an output end and a 24v negative electrode corresponding to the PLC, one ends of normally closed contacts of the top cover opening relay, the top cover closing relay, the lifting machine lifting relay, the lifting machine lowering relay, the support rod lifting relay, the support rod lowering relay, the box lifting relay and the box return relay are respectively connected with a 24v storage battery positive electrode, and the other ends of the normally closed contacts are respectively connected with a top cover opening valve of the execution control mechanism, The top cover closing valve, the lifting machine lifting valve, the lifting machine descending valve, the supporting rod lifting valve, the supporting rod descending valve, the box body lifting valve and the box body descending valve are connected, and the top cover opening valve, the top cover closing valve, the lifting machine lifting valve, the lifting machine descending valve, the supporting rod lifting valve, the supporting rod descending valve, the box body lifting valve and the box body descending valve are all connected with the negative electrode of the 24v storage battery.

Preferably, the temperature detection device comprises a temperature transmitter and a temperature sensor, the temperature transmitter is connected with a connecting terminal corresponding to the temperature sensor, and positive and negative connecting terminals on the temperature transmitter are respectively connected with the positive electrode of the 24v storage battery and an input terminal corresponding to the PLC controller.

Preferably, the temperature transmitter is a voltage type temperature transmitter, and the temperature sensor is a Pt100 thermal resistor.

Preferably, a first fuse is arranged between the positive electrode of the 24v storage battery and the oil pump motor, and the positive electrode of the 24v storage battery is connected with the second fuse in series and then is respectively connected with the selection control device and the power supply control device.

Preferably, the specific method for detecting whether contact adhesion is generated between the normally open contact and the normally closed contact of the oil pump relay comprises the following steps:

after any one of a top cover opening switch, a top cover closing switch, a lifting machine lifting switch, a lifting machine lowering switch, a supporting rod lifting switch, a supporting rod lowering switch, a box body lifting switch, a box body returning switch, a one-key loading switch and a one-key unloading switch of the selection control device is electrified and conducted, a PLC (programmable logic controller) outputs 24v voltage to a coil of an oil pump relay, an output end of the PLC connected with a normally closed contact of the oil pump relay receives a signal, a voltage value corresponding to the signal is detected through a built-in program of the PLC, the normally closed contact of the oil pump relay is disconnected and the normally open contact is closed under a normal state, an oil pump motor starts to work, the voltage value is 0v, after 5s, the built-in program of the PLC controls to stop outputting the voltage to the coil of the oil pump relay, and an output end of the PLC connected with the normally closed contact of the oil pump relay receives the signal again, the voltage value corresponding to the signal is detected again through a built-in program of the PLC, in a normal state, a normally open contact of the oil pump relay is opened, a normally closed contact is closed, the voltage value is 24v, the voltage values detected twice are compared within 2s through the built-in program of the PLC, and if the voltage values detected twice are both 24v, the phenomenon that the normally closed contact of the oil pump relay is adhered is indicated; if the normally closed contact adhesion phenomenon of the oil pump relay does not exist, a built-in program of the PLC controls a coil which continuously outputs voltage to the oil pump relay;

after any one of a top cover opening switch, a top cover closing switch, a lifting machine lifting switch, a lifting machine lowering switch, a supporting rod lifting switch, a supporting rod lowering switch, a box body lifting switch, a box body returning switch, a one-key loading switch and a one-key unloading switch of the selection control device is powered on and switched on, the PLC outputs 24v voltage to a coil of an oil pump relay, a normally closed contact of the oil pump relay is disconnected, the normally open contact is closed, an oil pump motor normally runs, an output end connected with the normally closed contact of the oil pump relay on the PLC receives a signal, a voltage value corresponding to the signal is detected through a built-in program of the PLC, the detected voltage value is 0v in a normal state, and the built-in program of the PLC detects the top cover opening switch, the top cover closing switch, the lifting machine lifting switch, the lifting machine lowering switch, the supporting rod lifting switch of the selection control device, The supporting rod drop switch, the box body lifting switch, the box body return switch, the one-key loading switch and the one-key unloading switch do not act for 10 minutes continuously, a built-in program of the PLC controls an oil pump motor to stop running automatically, an output end connected with a normally closed contact of an oil pump relay on the PLC receives a signal, a voltage value corresponding to the signal is detected through the built-in program of the PLC, the normally closed contact of the oil pump relay is closed and the normally open contact is disconnected in a normal state, the detected voltage value is 24v, the two detected voltage values are compared within 2s through the built-in program of the PLC, and if the two detected voltage values are 0v, the phenomenon that the normally open contact of the oil pump relay is adhered is indicated;

in the normal operation process of the oil pump, when a built-in program of the PLC detects that a top cover opening switch, a top cover closing switch, a lifting machine lifting switch, a lifting machine lowering switch, a supporting rod lifting switch, a supporting rod lowering switch, a box body lifting switch, a box body returning switch, a one-key loading switch and a one-key unloading switch of the selection control device do not act for 5 minutes continuously, the built-in program of the PLC controls an oil pump motor to stop automatically, an output end of the PLC, which is connected with a normally closed contact of an oil pump relay, receives a signal, a voltage value corresponding to the signal is detected through the built-in program of the PLC, the normally closed contact of the oil pump relay is closed and the normally open contact is opened, the detected voltage value is 24v, after 2s, the built-in program of the PLC outputs voltage to a coil of the oil pump relay, and an output end of the PLC, which is connected with the normally closed contact of the oil pump relay, receives the signal, detecting a voltage value corresponding to a signal through a built-in program of the PLC, wherein in a normal state, a normally closed contact of a coil of the oil pump relay is opened, a normally open contact is closed, the detected voltage value is 0v, the two detected voltage values are compared within 2s through the built-in program of the PLC, and if the two detected voltage values are 0v, the phenomenon that the normally open contact of the oil pump relay is adhered is indicated; if the normally open contact adhesion phenomenon of the oil pump relay does not exist, the oil pump motor continuously and normally operates.

The oil pump relay temperature monitoring device can dynamically monitor the temperature of the oil pump motor through the temperature detection device, solves the problem of burning out of the oil pump motor due to high temperature, solves the problems of poor system operation convenience and low automation degree through the control of the PLC, and simultaneously solves the problem of adhesion of oil pump relay contacts.

Drawings

Fig. 1 is a circuit schematic diagram of a hydraulic electric control device of a garbage transport vehicle based on PLC control.

In the figure: 1. a temperature detection device; SB1, top cover open switch; SB2, Top closure switch; SB3, elevator lifting switch; SB4, elevator lowering switch; SB5, support rod lifting switch; SB6, support rod lowering switch; SB7, case lifting switch; SB8, box return switch; SB9, one-key load switch; SB10, one-button unload switch; KA1 and a relay is opened on a top cover; KA2, a top cover closing relay; KA3, elevator lifting relay; KA4, a hoist lowering relay; KA5, a support rod lifting relay; KA6, a support rod descending relay; KA7, a box body lifting relay; KA8 and a box body return relay; KA9, an oil pump relay; DT1, top cover open valve; DT2, top cover shut-off valve; DT3, elevator lift valve; DT4, elevator lowering valve; DT5, support rod lift valve; DT6, elevator lowering valve; DT7, tank lift valve; DT8, tank lowering valve; f1, a first fuse; f2, second fuse.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the hydraulic electric control device for the garbage truck based on the PLC control comprises a 24v storage battery and a PLC controller, wherein the positive electrode of the 24v storage battery is connected with the corresponding input end of the PLC controller through a selection control device, a power supply control device is connected between the corresponding output end of the PLC controller and the negative electrode of the 24v storage battery, the power supply control device is also connected with the positive electrode of the 24v storage battery and is connected with an actuating mechanism control device in series, and the actuating mechanism control device is connected with the negative electrode of the 24v storage battery; concatenate temperature-detecting device 1 that is used for detecting oil pump motor temperature between the input that 24v battery and PLC controller correspond, be connected with the high temperature alarm pilot lamp between the output that the PLC controller corresponds and the negative pole of 24v battery, the positive pole and the oil pump motor of 24v battery are connected, oil pump motor and oil pump relay KA 9's normally closed contact, the other end and the output that the PLC controller corresponds of oil pump relay KA 9's normally closed contact are connected, oil pump relay KA 9's coil both ends are connected with the output that the PLC controller corresponds and the negative pole of 24v battery respectively, oil pump relay KA9 is equipped with normally open contact and connects, oil pump relay KA 9's normally open contact and normally closed contact share same binding post, oil pump relay KA 9's normally open contact's the other end and the negative pole of 24v battery are connected.

The selection control device comprises a top cover opening switch SB1, a top cover closing switch SB2, an elevator lifting switch SB3, an elevator lifting switch SB4, a support rod lifting switch SB5, a support rod lifting switch SB6, a box lifting switch SB7 and a box return switch SB8, wherein the top cover opening switch SB1, the top cover closing switch SB2, the elevator lifting switch SB3, the elevator lifting switch SB4, the support rod lifting switch SB5, the support rod lifting switch SB6, the box lifting switch SB7 and the box return switch SB8 are arranged in parallel. The selection control device also comprises a one-key loading switch SB9 and a one-key unloading SB10 switch, wherein the one-key loading switch SB9 and the one-key unloading SB10 switch are arranged in parallel and are used for executing full-automatic control, the automatic dumping of the garbage is completed through one-key loading, and the automatic dumping of the garbage is completed through one-key unloading.

The power supply control device comprises a top cover opening relay KA1, a top cover closing relay KA2, a lifting machine lifting relay KA3, a lifting machine lowering relay KA4, a supporting rod lifting relay KA5, a supporting rod lowering relay KA6, a box lifting relay KA7 and a box returning relay KA8, wherein the two ends of the coils of the top cover opening relay KA1, the top cover closing relay KA2, the lifting machine lifting relay KA3, the lifting machine lowering relay KA4, the supporting rod lifting relay KA5, the supporting rod lowering relay KA6, the box lifting relay KA7 and the box returning relay KA8 are respectively connected with the output end and the 24v negative electrode corresponding to the PLC controller, one ends of the normally closed contacts of the top cover opening relay KA1, the top cover closing relay KA2, the lifting machine lifting relay KA3, the lifting machine lowering relay KA4, the supporting rod lifting relay KA5, the supporting rod lowering relay KA6, the box lifting relay KA7 and the box returning relay 8 are all connected with the positive electrode of a storage battery, the other end of the hydraulic control system is respectively connected with a top cover opening valve DT1, a top cover closing valve DT2, an elevator lifting valve DT3, an elevator descending valve DT4, a support rod lifting valve DT5, a support rod descending valve DT6, a box body lifting valve DT7 and a box body descending valve DT8 of the execution control mechanism, and the top cover opening valve DT1, the top cover closing valve DT2, the elevator lifting valve DT3, the elevator descending valve DT4, the support rod lifting valve DT5, the support rod descending valve DT6, the box body lifting valve DT7 and the box body descending valve DT8 are all electromagnetic reversing valves on a hydraulic system and are all connected with the negative pole of a 24v storage battery.

Temperature-detecting device 1 includes temperature transmitter and temperature sensor, temperature transmitter is connected with the binding post that temperature sensor corresponds, last positive negative pole binding post of temperature transmitter is connected with the anodal input terminal that corresponds of the anodal and the PLC controller of 24v battery respectively.

The temperature transmitter is a voltage type temperature transmitter, and the temperature sensor is a Pt100 thermal resistor. A first fuse F1 is arranged between the positive electrode of the 24v storage battery and the oil pump motor, the positive electrode of the 24v storage battery is connected with a second fuse F2 in series and then is respectively connected with the selection control device and the power supply control device, and the first fuse F1 and the second fuse F2 are used for protecting circuits. The temperature sensor is installed at the periphery of the oil pump motor and used for collecting the dynamic temperature of the oil pump motor, the temperature sensor transmits a signal to the PLC through the temperature transmitter, a program arranged in the PLC carries out logic operation, if the temperature of the oil pump motor reaches the temperature (such as 60 degrees) preset by the program, the PLC controls the oil pump motor to stop working, outputs voltage to the high-temperature alarm indicator lamp, and lights the high-temperature alarm indicator lamp to remind a worker that the temperature of the oil pump motor is too high.

When the top cover is controlled to be opened, a top cover opening switch SB1 is pressed, a top cover opening relay KA1 is electrified, a normally open contact is closed, a top cover opening valve DT1 is electrified and opened, and a hydraulic system enables a top cover mechanism to act until the top cover opening operation is completed and maintained; when the control top cover is closed, the top cover is pressed to close the SB2 switch, the top cover opening switch SB1 resets, the top cover opening relay KA1 is powered off, the top cover opening valve DT1 is powered off and closed, the top cover closing relay KA2 is powered on, the normally open contact of the normally open contact is closed, the top cover closing valve DT2 is powered on and opened, and the hydraulic system enables the top cover mechanism to act until the top cover closing operation is completed and maintained. When the top cover opening switch SB1 is pressed again, the top cover closing switch SB2 is reset, and the top cover opening operation is performed.

When the lifting machine is controlled to lift, a lifting machine lifting switch SB3 is pressed, a lifting machine lifting relay KA3 is electrified, a normally open contact is closed, a lifting machine opening valve DT3 is electrified and opened, and a hydraulic system enables the lifting machine for lifting the garbage can to act until the lifting operation of the lifting machine is completed and maintained; when the elevator is controlled to fall, the elevator falling switch SB4 is pressed, the elevator rising switch SB3 is turned off and reset, the elevator falling relay KA4 is electrified, the normally open contact is closed, the elevator falling valve DT4 is electrified and opened, and the hydraulic system enables the elevator to act until the elevator falling operation is completed and maintained. When the lifter up switch SB3 is pressed again and the lifter down switch SB4 is reset, the lifter up operation is executed.

When the door at the tail of the garbage can body is controlled to be opened, a support rod lifting switch SB5 is pressed, a support rod lifting relay KA5 is electrified, a normally open contact is closed, a support rod lifting valve DT5 is electrified to be opened, and a hydraulic system enables a support rod to act until the door is opened and is kept; when the control box door is closed, the support rod descending switch SB6 is pressed, the support rod ascending switch SB5 resets, the support rod descending relay KA6 is powered on, the normally open contact is closed, the support rod descending valve DT6 is powered on and opened, and the hydraulic system enables the support rod to act until the box door descending operation is completed and maintained. The support bar up switch SB5 is pressed again, and the support bar down switch SB6 is reset, at this time, the door is opened.

When the garbage can is controlled to lift and turn, a can lifting switch SB7 is pressed, a can lifting relay KA7 is electrified, a normally open contact is closed, a can lifting valve DT7 is electrified and opened, and a hydraulic system enables a can turning mechanism to act until the can turning operation is finished and maintained; when the garbage can is controlled to return, the can return switch SB8 is pressed, the can lifting switch SB7 is reset, the can return relay KA8 is electrified, the normally open contact is closed, the can lowering valve DT8 is electrified and opened, and the hydraulic system enables the can turnover mechanism to act until the can return operation is completed and maintained. The box lift switch SB7 is pressed again and the box return switch SB8 is reset, at which time the above-described box lift flipping action is performed.

The one-key loading switch is pressed, the PLC controls the top cover opening relay KA1 to be powered on, the top cover opening valve DT1 is powered on and opened, after the top cover is opened within a preset time, the hydraulic system enables the top cover to be opened completely, the PLC controls the elevator lifting relay KA3 to be powered on, the elevator lifting valve DT3 is powered on and opened, within the preset time, the hydraulic system lifts the lifted garbage can and pours garbage into the garbage can from an inlet after the top cover is opened, then the PLC controls the elevator lifting relay KA4 to be powered on, the elevator lifting relay KA3 is powered off, the elevator lifting valve DT4 is powered on and opened, within the preset time, the hydraulic system returns the lifted garbage can, then the PLC controls the top cover closing relay KA2 to be powered on, the top cover opening relay KA1 is powered off, the top cover closing valve DT2 is powered on and opened, within the preset time, the hydraulic system closes the top cover, and one-key loading operation is completed.

The one-key unloading switch is pressed, the PLC controls the supporting rod lifting relay KA5 to be powered on, the supporting rod lifting valve DT5 is powered on and opened, after the opening of the tail box door of the garbage box is completed by the hydraulic system within a preset time, the PLC controls the box lifting relay KA7 to be powered on, the box lifting valve DT7 is powered on and opened, the hydraulic system lifts and overturns the garbage box to complete dumping of garbage within the preset time, then the PLC controls the box returning relay KA8 to be powered on, the box lifting relay KA7 is powered off, the box lowering valve DT8 is powered on and opened, within the preset time, the hydraulic system returns the garbage box, then the PLC controls the supporting rod lowering relay KA6 to be powered on, the supporting rod lifting relay KA5 is powered off, the supporting rod lowering valve DT6 is powered on and opened, within the preset time, the box door is closed by the hydraulic system, and one-key unloading operation is completed.

The specific method for detecting whether the normally open contact and the normally closed contact of the oil pump relay are adhered comprises the following steps:

the PLC controller outputs 24v voltage to a coil of the oil pump relay KA9 after any one of a top cover opening switch SB1, a top cover closing switch SB2, an elevator lifting switch SB3, an elevator lifting switch SB4, a support rod lifting switch SB5, a support rod lifting switch SB6, a box body lifting switch SB7, a box body returning switch SB8, a key loading switch SB9 and a key unloading switch SB10 is electrified and conducted, the PLC controller receives a signal from an output end connected with a normally closed contact of the oil pump relay KA9, a voltage value corresponding to a built-in program detection signal of the PLC controller is detected, in a normal state, the normally closed contact of the oil pump relay KA9 is disconnected, the normally open contact is closed, the motor starts to work, the voltage value is 0v, after 5s, the built-in program control of the PLC controller stops outputting the voltage to the coil of the oil pump relay KA9, the output end connected with the normally closed contact of the oil pump relay 9 on the PLC controller receives the signal again, the voltage value corresponding to the signal is detected again through a built-in program of the PLC, in a normal state, a normally open contact of the oil pump relay KA9 is opened, a normally closed contact is closed, the voltage value is 24v, the voltage value detected twice is compared within 2s through the built-in program of the PLC, and if the voltage values detected twice are both 24v, the phenomenon that the normally closed contact of the oil pump relay KA9 is adhered is indicated; if the adhesion phenomenon of the normally closed contact of the oil pump relay KA9 does not exist, a built-in program of the PLC controls a coil continuously outputting voltage to the oil pump relay KA 9;

the method comprises the steps that after any one of a top cover opening switch SB1, a top cover closing switch SB2, a lifting machine lifting switch SB3, a lifting machine lowering switch SB4, a supporting rod lifting switch SB5, a supporting rod lowering switch SB6, a box lifting switch SB7, a box returning switch SB8, a key loading switch SB9 and a key unloading switch SB10 is powered on and switched on, a PLC outputs 24v voltage to a coil of an oil pump relay KA9, a normally closed contact of the oil pump relay KA9 is opened, the normally open contact is closed, an oil pump motor normally operates, an output end, connected with the normally closed contact of the oil pump relay KA9, of the PLC receives signals, a voltage value corresponding to signals is detected through a program built in the PLC, the detected voltage value is 0v in the normal state, and the PLC detects the top cover opening switch SB1, the top cover closing switch SB2, the lifting machine lifting switch SB3, the top cover opening switch SB1 and the lifting machine lifting control device through the PLC, the supporting rod lowering switch SB5 and the supporting rod lifting switch SB6, The method comprises the following steps that an elevator descending switch SB4, a support rod ascending switch SB5, a support rod descending switch SB6, a box body lifting switch SB7, a box body returning switch SB8, a one-key loading switch SB9 and a one-key unloading switch SB10 do not act continuously for 10 minutes, a PLC controller is internally provided with a program to control an oil pump motor to automatically stop running, an output end of the PLC controller, which is connected with a normally closed contact of an oil pump relay KA9, receives a signal, a voltage value corresponding to the signal is detected through the PLC controller internal program, in a normal state, the normally closed contact of the oil pump relay KA9 is closed, a normally open contact is opened, the detected voltage value is 24v, the PLC controller internal program compares the voltage values detected twice in 2s, and if the voltage values detected twice are 0v, it is indicated that the normally open contact of the oil pump KA9 is adhered;

in the normal operation process of the oil pump, when a built-in program of the PLC detects that a top cover opening switch SB1, a top cover closing switch SB2, an elevator lifting switch SB3, an elevator lowering switch SB4, a support rod lifting switch SB5, a support rod lowering switch SB6, a box lifting switch SB7, a box returning switch SB8, a key loading switch SB9 and a key unloading switch SB10 do not act for 5 minutes continuously, the built-in program of the PLC controls the automatic stop operation of an oil pump motor, an output end connected with a normally closed contact of the oil pump relay KA9 on the PLC receives a signal, a voltage value corresponding to the built-in program detection signal of the PLC is used, in a normal state, the normally closed contact of the oil pump KA relay 9 is closed, the normally open contact is disconnected, the detected voltage value is 24v, and after 2s, the built-in program of the PLC outputs a coil of the voltage supply oil pump relay KA9, and an output end connected with the normally closed contact of the oil pump relay 9 on the PLC receives a signal, the voltage value corresponding to the signal is detected through a built-in program of the PLC, in a normal state, a normally closed contact of a coil of the oil pump relay KA9 is opened, a normally open contact is closed, the detected voltage value is 0v, the voltage values detected twice are compared within 2s through the built-in program of the PLC, and if the voltage values detected twice are 0v, the phenomenon that the normally open contact of the oil pump relay KA9 is adhered is indicated; if the normally open contact adhesion phenomenon of the oil pump relay KA9 does not exist, the oil pump motor continuously and normally operates.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. Garbage truck hydraulic pressure electrically controlled device based on PLC control, its characterized in that: the system comprises a 24v storage battery and a PLC (programmable logic controller), wherein the positive electrode of the 24v storage battery is connected with the corresponding input end of the PLC through a selection control device, a power supply control device is connected between the corresponding output end of the PLC and the negative electrode of the 24v storage battery, the power supply control device is also connected with the positive electrode of the 24v storage battery and is simultaneously connected with an actuating mechanism control device in series, and the actuating mechanism control device is connected with the negative electrode of the 24v storage battery; concatenate the temperature-detecting device who is used for detecting oil pump motor temperature between the input that 24v battery and PLC controller correspond, be connected with high temperature alarm indicator between the output that the PLC controller corresponds and the negative pole of 24v battery, the positive pole and the oil pump motor of 24v battery are connected, the oil pump motor is connected with oil pump relay's normally closed contact, oil pump relay's normally closed contact's the other end is connected with the output that the PLC controller corresponds, oil pump relay's coil both ends are connected with the output that the PLC controller corresponds and the negative pole of 24v battery respectively, oil pump relay is equipped with normally open contact, oil pump relay's normally open contact and the same binding post of normally closed contact sharing, oil pump relay's the other end of normally open contact and the negative pole of 24v battery are connected.

2. The PLC-control-based hydraulic electric control device for the garbage transport vehicle as claimed in claim 1, wherein: the selection control device comprises a top cover opening switch, a top cover closing switch, a lifting machine lifting switch, a lifting machine lowering switch, a supporting rod lifting switch, a supporting rod lowering switch, a box lifting switch and a box return switch, wherein the top cover opening switch, the top cover closing switch, the lifting machine lifting switch, the lifting machine lowering switch, the supporting rod lifting switch, the supporting rod lowering switch, the box lifting switch and the box return switch are arranged in parallel.

3. The PLC-control-based hydraulic electric control device for the garbage transport vehicle as claimed in claim 1, wherein: the selection control device further comprises a one-key loading switch and a one-key unloading switch, and the one-key loading switch and the one-key unloading switch are arranged in parallel.

4. The PLC-control-based hydraulic electric control device for the garbage transport vehicle as claimed in claim 1, wherein: the power supply control device comprises a top cover opening relay, a top cover closing relay, a lifting machine lifting relay, a lifting machine lowering relay, a support rod lifting relay, a support rod lowering relay, a box body lifting relay and a box body return relay, wherein the coil ends of the top cover opening relay, the top cover closing relay, the lifting machine lifting relay, the lifting machine lowering relay, the support rod lifting relay, the support rod lowering relay, the box body lifting relay and the box body return relay are respectively connected with an output end and a 24v negative electrode corresponding to a PLC (programmable logic controller), one ends of normally closed contacts of the top cover opening relay, the top cover closing relay, the lifting machine lifting relay, the lifting machine lowering relay, the support rod lifting relay, the support rod lowering relay, the box body lifting relay and the box body return relay are respectively connected with a 24v storage battery anode, the top cover closing valve, the lifting machine lifting valve, the lifting machine descending valve, the supporting rod lifting valve, the supporting rod descending valve, the box body lifting valve and the box body descending valve are connected, and the top cover opening valve, the top cover closing valve, the lifting machine lifting valve, the lifting machine descending valve, the supporting rod lifting valve, the supporting rod descending valve, the box body lifting valve and the box body descending valve are all connected with the negative electrode of the 24v storage battery.

5. The PLC-control-based hydraulic electric control device for the garbage transport vehicle as claimed in claim 1, wherein: the temperature detection device comprises a temperature transmitter and a temperature sensor, the temperature transmitter is connected with a connecting terminal corresponding to the temperature sensor, and a positive connecting terminal and a negative connecting terminal on the temperature transmitter are respectively connected with the positive pole of the 24v storage battery and an input terminal corresponding to the PLC.

6. The PLC-control-based hydraulic electric control device for the garbage transport vehicle as claimed in claim 1, wherein: the temperature transmitter is a voltage type temperature transmitter, and the temperature sensor is a Pt100 thermal resistor.

7. The PLC-control-based hydraulic electric control device for the garbage transport vehicle as claimed in claim 1, wherein: a first fuse is arranged between the positive electrode of the 24v storage battery and the oil pump motor, and the positive electrode of the 24v storage battery is connected with a second fuse in series and then is respectively connected with the selection control device and the power supply control device.

8. The PLC-control-based hydraulic electric control device for the garbage transport vehicle as claimed in claim 1, wherein: the specific method for detecting whether the normally open contact and the normally closed contact of the oil pump relay are adhered comprises the following steps: