CN203362685U - Electric hydraulic control device for lifting supporting bridge - Google Patents

Abstract

The utility model discloses an electric hydraulic control device for lifting a supporting bridge. The electric hydraulic control device comprises a double-point moving lifting bridge direction switch and a hydraulic control device body, wherein the double-point moving lifting bridge direction switch is connected with an automobile body controller; an input end of the automobile body controller is connected with a pressure relay, an output end of the automobile body controller is connected with a valve body of a reversing solenoid valve, and the automobile body controller is connected with the hydraulic control device body; the hydraulic control device body comprises a motor pump set, an oil box is arranged below the motor pump set, the motor pump set is connected with a hydraulic integrated block set, and the hydraulic integrated block set is connected with an oil cylinder through a corresponding pipeline and pipe fitting. The electric hydraulic control device provided by the utility model has the advantages that the operation control is simple, the degree of automation is high and the system is reliable.

Description

An electro-hydraulic control device for lifting a support bridge

technical field

The utility model relates to the fields of automobile electronic control technology and hydraulic control technology, in particular to an electro-hydraulic control device for hoisting a heavy-duty vehicle support bridge.

Background technique

At present, the lifting control system of the supporting bridge of heavy vehicles has been widely used, which solves the problems that all tires of the existing vehicles are on the ground when driving without load, which reduces the speed of empty driving, increases fuel consumption, and accelerates the wear and tear of tires, etc. . However, most of the existing hydraulic control devices for the lifting of the supporting bridge are manual hydraulic control, and the operating handles are mostly installed on the side of the vehicle frame outside the cab, thus causing disadvantages such as inconvenient operation, low work efficiency, and unreliable systems. With the rapid development of automotive electronic control technology and hydraulic control technology, an electro-hydraulic control device for supporting bridge lifting has emerged at the historic moment. This device has the advantages of simple operation and control, high degree of automation, and reliable system.

Utility model content

In order to solve the deficiencies in the prior art, the utility model discloses an electro-hydraulic control device for lifting a supporting bridge. The device has the advantages of simple operation and control, high degree of automation, and reliable system.

In order to achieve the above object, the concrete scheme of the present utility model is as follows:

An electro-hydraulic control device for lifting a support bridge, including a double-jog lifting bridge lift switch and a hydraulic control device, the double-jog lifting bridge lift switch is connected to a body controller, and an input end of the body controller is connected to a pressure relay , an output end of the body controller is connected with the reversing solenoid valve, and the body controller is also connected with the hydraulic control device.

The hydraulic control device includes a motor pump set, an oil tank is arranged under the motor pump set, the motor pump set is connected with the hydraulic integrated valve block group, and the hydraulic integrated valve block group is connected with the oil cylinder through corresponding pipelines and pipe fittings.

The motor pump set includes a motor, the motor is connected to a relay, the coil end of the relay is connected to the corresponding output port of the vehicle body controller, the control end of the motor is connected to the power supply of the whole vehicle after passing through the normally open point of the relay, and the output end of the motor is connected to the power supply of the whole vehicle. The hydraulic pump is connected.

The hydraulic integrated valve block group includes a reversing solenoid valve and a pressure relay. The oil inlet of the reversing solenoid valve is connected to the oil outlet of the hydraulic pump through a common check valve, and the oil inlet of the hydraulic pump is connected to the oil tank. The oil port of the solenoid valve is also connected to the oil cylinder through a two-way hydraulic lock composed of two hydraulic one-way valves, the oil return port of the reversing solenoid valve is connected to the oil tank, and the oil inlet at the lower end of the pressure relay is connected to the oil outlet of the hydraulic pump , The oil outlet of the hydraulic pump is also connected to the oil tank through the overflow valve, and the reversing solenoid valve, pressure relay, ordinary check valve, two hydraulic check valves and the overflow valve are integrated on different faces of the manifold.

The vehicle body controller is connected with the combination meter through the CAN bus.

The double jog lift axle lift switch is arranged inside the cab, and the double jog lift axle lift switch is provided with an upshift, a zero gear and a downshift, wherein the upshift and downshift are connected to corresponding input ports of the vehicle body controller.

The oil cylinder is also connected with the supporting bridge lifting mechanism.

The reversing solenoid valve is a two-position four-way reversing solenoid valve.

The body controller will control the motor to be energized through the relay according to the collected up or down switch signal and the signal of the pressure relay micro switch, and drive the hydraulic pump to provide hydraulic oil to the oil cylinder, which is connected to the lifting mechanism of the support bridge; the body controller By detecting the state of the input port, it can effectively detect whether the lift switch of the double-jog lifting axle is in the up gear or in the down gear. When the support bridge is going up, press the lift switch of the double jog lifting bridge upward, the body controller detects that the lift switch is in the up gear, and detects that the micro switch of the pressure relay is closed, at this time, the hydraulic pump station will be driven through the relay The motor on the motor is electrically rotated to drive the oil pump to output hydraulic oil to the oil cylinder, and drive the piston rod in the lifting mechanism to extend to realize the lifting of the supporting bridge. After the lift is in place, the system pressure will rise to the predetermined pressure value (14MPa) of the pressure relay, and the micro switch of the pressure relay will be disconnected. At this time, the body controller will control the disconnection of the motor, and the action will stop. Two-way hydraulic lock composed of hydraulic one-way valve to realize. When the supporting bridge is going down, press down the lifting switch of the double jog lifting bridge. The body controller detects that the switch is in the down gear. At this time, according to the signal of the down switch, the reversing solenoid valve is controlled to be energized, so that the hydraulic oil The flow is reversed. At this time, the body controller drives the electric motor through the relay to rotate 2 seconds behind the reversing solenoid valve, and drives the oil pump to output hydraulic oil to the oil cylinder, so that the piston rod is retracted, and the support bridge is lowered. After falling in place, the pressure rises to the predetermined pressure value (14MPa) of the pressure relay, so that the micro switch of the pressure relay is disconnected, the body controller controls the disconnection of the motor, and at the same time, the reversing solenoid valve is also powered off, and the action stops. During the ascent or descent of the supporting bridge, it can be started and stopped arbitrarily according to the signal of the lifting switch.

A control method of an electro-hydraulic control device for lifting a support bridge, comprising the following steps:

Step 1. The body controller detects the state of the terminals of the upshift and downshift terminals of the double jog lifting axle lift switch, as well as the state of the micro switch of the pressure relay;

Step 2: When the lift switch of the double-jog lifting axle is in the up gear, and the micro switch of the pressure relay is in the closed state, the body controller controls the motor to work through the relay in the lift motor assembly, and drives the oil pump to output hydraulic oil to the oil cylinder. Extend the piston rod to realize the lifting of the supporting bridge. During the lifting process, the supporting bridge can be started and stopped arbitrarily;

Step 3: After the support bridge is lifted in place, judge whether the micro switch of the pressure relay is disconnected. When the micro switch of the pressure relay is disconnected, the motor will stop working;

Step 4. When the micro switch of the pressure relay is not disconnected, judge whether the lifting switch of the double jog lifting axle has returned to the zero gear. When performing the next lifting operation, first return to the zero gear and then carry out the lifting operation.

In the first step, when the lift switch of the double-jog lifting axle is in the down gear, and the micro switch of the pressure relay is in the closed state, at this time, the vehicle body controller controls the reversing solenoid valve to be energized according to the down signal of the lift switch, so that the hydraulic pressure The oil and oil flow is reversed, and the body controller drives the motor through the relay to rotate 2 seconds behind the reversing solenoid valve, driving the oil pump to output hydraulic oil to the oil cylinder, so that the piston rod is retracted, and the support bridge is lowered. During the descent, The support bridge can start and stop arbitrarily. After it is lowered in place, judge whether the micro switch of the pressure relay is disconnected. When the micro switch of the pressure relay is disconnected, the motor will stop working. Is the lifting switch of the lifting axle returned to zero gear? When the double-jog lifting switch of the lifting bridge is not returned to zero gear, the motor will continue to work for 40 seconds and then stop. When the next lifting operation is performed, it will first return to zero gear and then perform the lifting operation .

The beneficial effects of the utility model:

Since the double jog lift axle lift switch is installed on the operation panel of the instrument panel inside the cab, the driver can operate and control the lift of the rear support axle more conveniently. When the support bridge is rising or falling, the body controller will control the combination instrument through the CAN bus to give a corresponding rising or falling working instruction. After the ascent or descent is in place, if the driver does not reset the switch to zero gear at this time, the motor will not continue to operate until the next ascent or descent operation. Therefore, the body controller detects that the micro switch of the pressure relay is disconnected, and the motor has stopped. Work. If the pressure relay in the system fails unexpectedly, there are protection systems in both the oil circuit and the circuit. The overflow valve in the oil circuit can ensure that the system pressure is less than the set 16MPa, and the body controller in the circuit can ensure that the motor has the longest The working time does not exceed 40 seconds to protect the motor. During the ascent or descent of the supporting bridge, it can be started and stopped arbitrarily according to the signal of the lifting switch.

Description of drawings

The overall structural circuit schematic diagram of Fig. 1 the utility model;

Fig. 2 electro-hydraulic control schematic diagram of the utility model;

Fig. 3 flow chart of electrohydraulic control method of the present utility model;

In the figure, 1 double-jog lift axle lift switch, 2 body controller, 3 hydraulic integrated valve block group, 4 combined instrument, 5 relay, 6 motor, 7 pressure relay, 8 reversing solenoid valve, 9 hydraulic control check valve , 10 oil cylinders, 11 hydraulic pumps, 12 overflow valves, 13 fuel tanks, 14 motor pump units, 15 ordinary one-way valves.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is described in detail:

As shown in Figure 1-2, an electro-hydraulic control device for supporting the lifting of the bridge includes a double-jog lifting bridge lifting switch 1 and a hydraulic control device. The double-jogging lifting bridge lifting switch 1 is connected to the vehicle body controller 2. An input end of the body controller 2 is connected with the pressure relay 7, an output end of the body controller 2 is connected with the reversing solenoid valve 8, and the body controller 2 is connected with the hydraulic control device.

The hydraulic control device includes a motor pump group 14, an oil tank 13 is arranged below the motor pump group 14, the motor pump group 14 is connected with the hydraulic integrated valve block group 3, and the hydraulic integrated valve block group 3 is connected to the oil cylinder through corresponding pipelines and pipe fittings. 10 connected.

The motor pump unit 14 includes a motor 6, the motor 6 is connected to the relay 5, the coil end of the relay 5 is connected to the corresponding output port of the vehicle body controller 2, and the control end of the motor 6 is connected to the vehicle power supply after the relay 5 is normally open. The output end of the motor 6 is connected with the hydraulic pump 11.

The hydraulic integrated valve block group 3 includes a reversing solenoid valve 8 and a pressure relay 7, the oil inlet of the reversing solenoid valve 8 is connected with the oil outlet of the hydraulic pump 11 through a common check valve 15, and the oil inlet of the hydraulic pump 11 The port is connected with the oil tank 13, and the oil port of the reversing solenoid valve 8 is also connected with the oil cylinder 10 through a two-way hydraulic lock composed of two hydraulic check valves 9, and the oil return port of the reversing solenoid valve 8 is connected with the oil tank 13, and the pressure switch 7 The oil inlet at the lower end is connected with the oil outlet of the hydraulic pump 11, and the oil outlet of the hydraulic pump 11 is also connected with the oil tank 13 through the overflow valve 12, the reversing solenoid valve 8, the pressure relay 7, the ordinary one-way valve 15, two A hydraulic check valve 9 and relief valve 12 are integrated on different faces of the manifold.

The vehicle body controller 2 is connected with the instrument cluster 4 through the CAN bus.

The double jog lift axle lift switch 1 is arranged inside the cab, and the double jog lift axle lift switch 1 is provided with an upshift, a zero gear and a downshift, wherein the upshift and downshift are corresponding to the input ports of the body controller 2 connected.

The oil cylinder 10 is also connected with the supporting bridge lifting mechanism.

The reversing solenoid valve 8 is a two-position four-way reversing solenoid valve.

As shown in Figure 3, the body controller 2 will control the motor 6 to be powered through the relay 5 according to the collected rising or falling switch signal and the signal of the micro switch of the pressure relay 7, and drive the hydraulic pump 11 to provide hydraulic oil to the oil cylinder 10 , the oil cylinder 10 is connected with the support bridge lifting mechanism; the vehicle body controller 2 can effectively detect whether the double-jog lifting bridge lift switch 1 is in an upshift or a downshift by detecting the state of the input port. When the support bridge is going up, press the double-jog lift bridge lift switch 1 upwards, the body controller 2 detects that the lift switch is in the upward gear, and detects that the pressure relay 7 micro switch is closed, and at this time the relay 5 Drive the motor 6 on the hydraulic pump 11 to rotate electrically to drive the oil pump to output hydraulic oil to the oil cylinder 10, and drive the piston rod in the lifting mechanism to stretch out to realize the lifting of the supporting bridge. After the lift is in place, the system pressure will rise to the predetermined pressure value (14MPa) of the pressure relay 7, and the micro switch of the pressure relay 7 will be disconnected. At this time, the body controller 2 will control the disconnection of the motor 6, the action will stop, and the lock depends on the oil circuit. The hydraulic one-way valve 9 in realizes. When the support bridge is going down, press down the double-jog lifting switch 1, and the body controller 2 detects that the switch is in the down gear. At this time, the reversing solenoid valve 8 is controlled to be energized according to the down switch signal, so that The hydraulic oil flow is reversed. At this time, the body controller 2 drives the motor 6 through the relay 5. The rotation lags behind the reversing solenoid valve 8 for 2 seconds, and drives the oil pump to output hydraulic oil to the cylinder 10, so that the piston rod is retracted to achieve support. The fall of the bridge. After falling in place, the pressure rises to the predetermined pressure value (14MPa) of the pressure relay 7, so that the micro switch of the pressure relay 7 is disconnected, the body controller 2 controls the disconnection of the motor 6, and at the same time, the reversing solenoid valve 8 is also powered off, and the action stops. During the ascent or descent of the supporting bridge, it can be started and stopped arbitrarily according to the signal of the lifting switch.

A control method of an electro-hydraulic control device for lifting a support bridge, comprising the following steps:

Step 1, the body controller 2 detects the state of the upshift and downshift terminals of the double-jog lifting axle lift switch 1, and the state of the micro switch of the pressure relay 7;

Step 2, when the lift switch 1 of the double jog lifting axle is in the up gear, and the micro switch of the pressure relay 7 is in the closed state, the body controller 2 controls the motor 6 to work through the relay 5 in the lift motor assembly 3 to drive the oil pump Output hydraulic oil to the oil cylinder 10, so that the piston rod is stretched out to realize the lifting of the support bridge. During the lifting process, the support bridge can be started and stopped at will;

Step 3, after the supporting bridge is lifted to the designated position, judge whether the micro switch of the pressure relay 7 is disconnected, and when the micro switch of the pressure relay 7 is disconnected, the motor 10 will stop working;

Step 4. When the micro switch of the pressure relay 7 is not disconnected, judge whether the double-jog lifting axle lift switch 1 has returned to zero gear. When the double-jog lifting bridge lift switch 1 has not returned to zero gear, the motor 6 will continue to work Stop after 40s. When the next lifting operation is performed, return to the zero gear before performing the lifting operation.

In the first step, when the lift switch 1 of the double jog lifting axle is in the down gear, and the micro switch of the pressure relay 7 is in the closed state, at this moment, the vehicle body controller 2 controls the reversing solenoid valve 8 to be energized according to the switch down signal, In this way, the hydraulic oil flow is reversed, and the body controller 2 drives the motor 6 through the relay 5 to rotate 2 seconds behind the reversing solenoid valve 8, and drives the oil pump to output hydraulic oil to the cylinder 10, so that the piston rod is retracted to achieve support During the descent of the bridge, the support bridge can start and stop arbitrarily. After the descent is in place, judge whether the micro switch of the pressure relay 7 is disconnected. When the micro switch of the pressure relay 7 is disconnected, the motor 10 will stop working. 7. If the micro switch is not disconnected, judge whether the double-jog lifting bridge lifting switch 1 has returned to zero gear. When the double-jogging lifting For the next lifting operation, first return to the zero gear and then carry out the lifting operation.

Claims (7)

1. An electro-hydraulic control device for supporting bridge lifting is characterized in that it comprises a double jog lifting bridge lifting switch and a hydraulic control device, and the double jogging lifting bridge lifting switch is connected with the vehicle body controller, and a part of the vehicle body controller The input end is connected with the pressure relay, an output end of the body controller is connected with the reversing solenoid valve, and the body controller is also connected with the hydraulic control device; The hydraulic control device includes a motor pump set, an oil tank is arranged under the motor pump set, the motor pump set is connected with the hydraulic integrated valve block group, and the hydraulic integrated valve block group is connected with the oil cylinder through corresponding pipelines and pipe fittings. 2. The electro-hydraulic control device for lifting the supporting bridge according to claim 1, wherein the motor-pump unit includes a motor, the motor is connected to a relay, and the coil end of the relay is connected to the corresponding output port of the vehicle body controller. Connection, the control end of the motor is connected to the power supply of the whole vehicle after the relay is normally open, and the output end of the motor is connected to the hydraulic pump. 3. The electro-hydraulic control device for supporting the lifting of the bridge according to claim 1, wherein the hydraulic integrated valve block group includes a reversing solenoid valve and a pressure relay, and the oil inlet of the reversing solenoid valve passes through a common The check valve is connected to the oil outlet of the hydraulic pump, the oil inlet of the hydraulic pump is connected to the fuel tank, and the oil port of the reversing solenoid valve is also connected to the oil cylinder through a two-way hydraulic lock composed of two hydraulic check valves. The oil return port of the valve is connected to the oil tank, the oil inlet at the lower end of the pressure relay is connected to the oil outlet of the hydraulic pump, and the oil outlet of the hydraulic pump is also connected to the oil tank through the overflow valve. The valve, two hydraulic check valves and the relief valve are integrated on different faces of the manifold. 4. The electro-hydraulic control device for supporting the lifting of the bridge according to claim 1, wherein the vehicle body controller is connected to the combination meter through the CAN bus. 5. The electro-hydraulic control device for supporting the lifting of the bridge according to claim 1, wherein the double jog lifting bridge lifting switch is arranged inside the driver's cab, and the double jogging lifting bridge lifting switch is provided with an upshift , zero gear and downshift, wherein the upshift and downshift are connected to corresponding input ports of the body controller. 6. The electro-hydraulic control device for lifting the supporting bridge according to claim 1, wherein the oil cylinder is also connected with the lifting mechanism of the supporting bridge. 7. The electro-hydraulic control device for supporting the lifting of the bridge according to claim 3, wherein the reversing solenoid valve is a two-position four-way reversing solenoid valve.

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