Double-oil-cylinder hydraulic synchronous control system for heavy-duty forklift hopper

Abstract

The utility model relates to the technical field of fork truck, and disclose heavy fork truck hopper double oil cylinder hydraulic synchronous control system, the input of pump is fixed with the oil suction pipe, and the oil suction pipe extends into the hydraulic oil tank, the motor is fixedly connected with the rotating shaft of pump, the motor is connected with the controller electricity, the pump oil outlet and the multiway valve attribute link on P1 mouth connection, the multiway valve attribute link on A mouth and the first speed regulating valve, second speed regulating valve on A1 and A2 mouth connection, the first speed regulating valve, second speed regulating valve on A3 mouth and A4 mouth respectively with the left oil cylinder, right oil cylinder on the rodless cavity body connection, the multiway valve attribute link on B mouth and the third speed regulating valve, fourth speed regulating valve on B1 and B2 mouth connection, the third speed regulating valve, fourth speed regulating valve on B3 mouth and B4 mouth respectively with the left oil cylinder, right oil cylinder on the rod cavity body connection, the utility model realizes double cylinder accurate synchronous control.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, and in particular to a dual-cylinder hydraulic synchronous control system for a heavy-duty forklift hopper. Background Technology

[0002] The current dual-cylinder hydraulic synchronous control system configured in heavy-duty forklifts is in poor condition and has obvious asynchrony problems. Its core fault is that the two push cylinders fail to maintain consistent speed and displacement when they are in motion, which causes the bucket to be offset and torsional deformed during the lifting process, resulting in mechanical interference with the feeding mechanism frame and causing operational jamming.

[0003] This fault condition directly causes two major negative impacts:

[0004] Severely reduced work efficiency: Operators need to repeatedly fine-tune the position of the forklift to overcome jamming in order to feed the aluminum ingot into the furnace, which significantly increases the cycle time of a single operation and affects the overall work efficiency in front of the aluminum furnace.

[0005] Equipment reliability is compromised: the hopper offset causes structural components to bear additional torque, which can easily lead to fatigue damage during long-term operation; under different operating conditions, some pipelines and cylinders of the hydraulic system take a long time to operate in front of the furnace, absorbing more heat, which exacerbates the aging of seals or the risk of internal leakage, and ultimately shortens the service life of key components of the whole vehicle.

[0006] To address the aforementioned issues, a dual-cylinder hydraulic synchronous control system for heavy-duty forklift hoppers was designed. Utility Model Content

[0007] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to propose a dual-cylinder hydraulic synchronous control system for heavy-duty forklift hoppers, achieving precise synchronous control of the two cylinders.

[0008] The heavy-duty forklift hopper dual-cylinder hydraulic synchronous control system proposed in this utility model includes a hydraulic oil tank, a pump, a motor, a controller, a multi-way valve attachment, a first speed control valve, a second speed control valve, a third speed control valve, a fourth speed control valve, a right cylinder piston rod position sensor, a left cylinder piston rod position sensor, a left cylinder, a right cylinder, a control handle, and a hopper.

[0009] The pump has a suction pipe fixed at its input end, and the suction pipe extends into the hydraulic oil tank. The motor is fixedly connected to the rotating shaft of the pump, and the motor is electrically connected to the controller.

[0010] The pump outlet is connected to port P1 of the multi-way valve attachment. Port A of the multi-way valve attachment is connected to ports A1 and A2 of the first and second speed control valves. Ports A3 and A4 of the first and second speed control valves are connected to the rodless chambers of the left and right cylinders, respectively. Port B of the multi-way valve attachment is connected to ports B1 and B2 of the third and fourth speed control valves. Ports B3 and B4 of the third and fourth speed control valves are connected to the rod chambers of the left and right cylinders, respectively.

[0011] The left cylinder piston rod position sensor is mounted at the connection between the left cylinder and the first speed control valve, and the right cylinder piston rod position sensor is mounted at the connection between the right cylinder and the second speed control valve.

[0012] The control handle controls the operation of the dual-cylinder hydraulic synchronous control system through the controller. The left cylinder, the right cylinder and the hopper are rigidly mechanically connected. The hopper uses an arc-shaped scoop to push and gather aluminum ingots, sending them into the aluminum furnace.

[0013] Preferably, the multi-way valve accessory includes a secondary relief valve and a valve core electro-proportional control module, wherein the valve core electro-proportional control module consists of a left proportional valve, a right proportional valve and a main valve core.

[0014] Preferably, the control handle is electrically connected to the valve core electro-proportional control module.

[0015] Preferably, the control handle is electrically connected to the controller, and the controller is electrically connected to the right cylinder piston rod position sensor and the left cylinder piston rod position sensor, respectively.

[0016] Preferably, the first speed control valve consists of an adjustable flow valve, a one-way valve, and a two-position two-way valve.

[0017] Preferably, the first speed control valve, the second speed control valve, the third speed control valve, and the fourth speed control valve are all of the same model.

[0018] The beneficial effects of this utility model are:

[0019] 1. Achieve precise synchronization between the two cylinders;

[0020] 2. Improve the efficiency of aluminum charge feeding into the furnace;

[0021] 3. Reduce the time of a single operation and effectively extend the life of the parts of the vehicle that are close to the furnace. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the dual-cylinder hydraulic synchronous control system for the heavy-duty forklift hopper proposed in this utility model.

[0023] Figure 2 This is a schematic diagram of the valve core electro-proportional control module of the dual-cylinder hydraulic synchronous control system for heavy-duty forklift hopper proposed in this utility model.

[0024] In the diagram: 1. Hydraulic oil tank; 2. Pump; 3. Motor; 4. Controller; 5. Multi-way valve attachment; 51. Secondary relief valve; 52. Valve core electro-proportional control module; 521. Left proportional valve; 522. Right proportional valve; 523. Main valve core; 6. First speed control valve; 61. Adjustable flow valve; 62. Check valve; 63. Two-position two-way valve; 7. Second speed control valve; 8. Third speed control valve; 9. Fourth speed control valve; 10. Right cylinder piston rod position sensor; 11. Left cylinder piston rod position sensor; 12. Left cylinder; 13. Right cylinder; 14. Control handle; 15. Hopper; 16. Aluminum ingot. Detailed Implementation

[0025] Reference Figure 1-2 The heavy-duty forklift hopper dual-cylinder hydraulic synchronous control system includes a hydraulic oil tank 1, a pump 2, a motor 3, a controller 4, a multi-way valve attachment 5, a first speed control valve 6, a second speed control valve 7, a third speed control valve 8, a fourth speed control valve 9, a right cylinder piston rod position sensor 10, a left cylinder piston rod position sensor 11, a left cylinder 12, a right cylinder 13, a control handle 14, and a hopper 15.

[0026] The pump 2 has a suction pipe fixed at its input end, and the suction pipe extends into the hydraulic oil tank 1. The motor 3 is fixedly connected to the rotating shaft of the pump 2, and the motor 3 is electrically connected to the controller 4.

[0027] The oil outlet of pump 2 is connected to port P1 on multi-way valve accessory 5. Port A on multi-way valve accessory 5 is connected to ports A1 and A2 on the first speed control valve 6 and the second speed control valve 7. Ports A3 and A4 on the first speed control valve 6 and the second speed control valve 7 are respectively connected to the rodless chambers on the left cylinder 12 and the right cylinder 13. Port B on multi-way valve accessory 5 is connected to ports B1 and B2 on the third speed control valve 8 and the fourth speed control valve 9. Ports B3 and B4 on the third speed control valve 8 and the fourth speed control valve 9 are respectively connected to the rod chambers on the left cylinder 12 and the right cylinder 13.

[0028] The left cylinder piston rod position sensor 11 is mounted at the connection between the left oil cylinder 12 and the first speed control valve 6, and the right cylinder piston rod position sensor 10 is mounted at the connection between the right oil cylinder 13 and the second speed control valve 7.

[0029] The control handle 14 controls the operation of the dual-cylinder hydraulic synchronous control system through the controller 4. The left cylinder 12, the right cylinder 13 and the hopper 15 are rigidly mechanically connected. The hopper 15 pushes and gathers the aluminum ingot material 16 through an arc-shaped scoop, so that it is sent to the aluminum furnace.

[0030] The multi-way valve attachment 5 includes a secondary relief valve 51 and a valve core electro-proportional control module 52. The valve core electro-proportional control module 52 consists of a left proportional valve 521, a right proportional valve 522, and a main valve core 523. The controller 4 receives signals from the operating control handle 14, the left cylinder piston rod position sensor 11, and the right cylinder piston rod position sensor 10 in real time to determine the positions of the left cylinder 12 and the right cylinder 13. If they are different, the controller 4 will actively send another signal to the control handle 14 to reduce the pilot oil supply of the left proportional valve 521 and the right proportional valve 522 on the valve core electro-proportional control module 52, thereby controlling the oil flow of the main valve core 523. The change in flow will cause the first speed control valve 6, the second speed control valve 7, the third speed control valve 8, and the fourth speed control valve 9 to adaptively stabilize the pressure, so that the left cylinder 12 and the right cylinder 13 can return to the same speed. Through the cooperation of the above components, the consistency of the left cylinder 12 and the right cylinder 13 is achieved, so as to reduce the mechanical error generated during operation, ensure the operation accuracy, and ultimately achieve precise control.

[0031] The control handle 14 is electrically connected to the valve core electro-proportional control module 52.

[0032] The control handle 14 is electrically connected to the controller 4, and the controller 4 is electrically connected to the right cylinder piston rod position sensor 10 and the left cylinder piston rod position sensor 11, respectively.

[0033] The first speed control valve 6 consists of an adjustable flow valve 61, a one-way valve 62, and a two-position two-way valve 63.

[0034] The first speed control valve 6, the second speed control valve 7, the third speed control valve 8, and the fourth speed control valve 9 are all of the same model, Hydraforce FR50-28.

[0035] When this device is in use, pump 2, driven by motor 3, draws oil from hydraulic tank 1. At this time, control handle 14 can be manipulated to cause the multi-way valve attachment 5 to perform the desired action according to the operating rules. When the control handle 14 sends a signal, the secondary relief valve 51 and the valve core electro-proportional control module 52 on the multi-way valve attachment 5 are independently energized, controlling their respective valve cores to open the oil circuit, thereby pushing the main valve core 523 to move. The left proportional valve 521 and right proportional valve 522 are independently energized. Electricity enables the main valve core 523 to switch up and down, achieving different hydraulic actions, which respectively play the roles of pressure stabilization and precise control. When oil is discharged from port A on the multi-way valve accessory 5, oil is supplied to ports A1 and A2 on the first speed control valve 6 and the second speed control valve 7. The adjustable flow valve 61, check valve 62, and two-position two-way valve 63 in the first speed control valve 6 also function. Then, oil is supplied to the rodless chambers of the left cylinder 12 and the right cylinder 13 through ports A3 and A4 on the first speed control valve 6 and the second speed control valve 7, pushing the left cylinder 12. The piston cylinder on the right hydraulic cylinder 13 moves, thereby pushing the hopper 15 forward and sending the accumulated aluminum ingot 16 into the furnace. At this time, the left hydraulic cylinder 12 and the right hydraulic cylinder 13 are equipped with a right cylinder piston rod position sensor 10 and a left cylinder piston rod position sensor 11 to monitor the displacement of the piston rods on the left hydraulic cylinder 12 and the right hydraulic cylinder 13 in real time, and provide real-time feedback signals to the controller 4. The controller 4 then actively controls the opening of the third speed regulating valve 8 and the fourth speed regulating valve 9 through the B1 and B2 ports of the return flow multi-way valve accessory 5 to control the... The operating speed of hopper 15 eliminates the asynchronous movement of left cylinder 12 and right cylinder 13, thereby achieving stable pressure and precise movement of left cylinder 12 and right cylinder 13. The adjustable flow valve 61, check valve 62 and two-position two-way valve 63 in the first speed control valve 6 also work in real time and restrict each other. The second speed control valve 7, third speed control valve 8 and fourth speed control valve 9 also work simultaneously. The adjustable flow valve 61 needs to be set in the initial no-load state to eliminate the influence of factors such as initial friction force and changes in friction boundary conditions after a period of use.

[0036] The above describes the working process of a dual-cylinder hydraulic synchronous control system for a heavy-duty forklift aluminum hopper. When the hopper 15 is in the same situation, the process is repeated. However, at this time, the hopper 15 is unloaded and does not need to push the aluminum ingot 16. It still requires synchronous movement and efficient pull-back movement.

Claims

1. A dual-cylinder hydraulic synchronous control system for a heavy-duty forklift hopper, characterized in that: Includes hydraulic oil tank, pump, motor, controller, multi-way valve attachment, first speed control valve, second speed control valve, third speed control valve, fourth speed control valve, right cylinder piston rod position sensor, left cylinder piston rod position sensor, left cylinder, right cylinder, control handle, and hopper; The pump has a suction pipe fixed at its input end, and the suction pipe extends into the hydraulic oil tank. The motor is fixedly connected to the rotating shaft of the pump, and the motor is electrically connected to the controller. The pump outlet is connected to port P1 of the multi-way valve attachment. Port A of the multi-way valve attachment is connected to ports A1 and A2 of the first and second speed control valves. Ports A3 and A4 of the first and second speed control valves are connected to the rodless chambers of the left and right cylinders, respectively. Port B of the multi-way valve attachment is connected to ports B1 and B2 of the third and fourth speed control valves. Ports B3 and B4 of the third and fourth speed control valves are connected to the rod chambers of the left and right cylinders, respectively. The left cylinder piston rod position sensor is mounted at the connection between the left cylinder and the first speed control valve, and the right cylinder piston rod position sensor is mounted at the connection between the right cylinder and the second speed control valve. The control handle controls the operation of the dual-cylinder hydraulic synchronous control system through the controller. The left cylinder, the right cylinder and the hopper are rigidly mechanically connected. The hopper uses an arc-shaped scoop to push and gather aluminum ingots, sending them into the aluminum furnace.

2. The heavy-duty forklift hopper dual-cylinder hydraulic synchronous control system according to claim 1, characterized in that: The multi-way valve accessory includes a secondary relief valve and a valve core electro-proportional control module, which consists of a left proportional valve, a right proportional valve, and a main valve core.

3. The heavy-duty forklift hopper dual-cylinder hydraulic synchronous control system according to claim 2, characterized in that: The control handle is electrically connected to the valve core electro-proportional control module.

4. The heavy-duty forklift hopper dual-cylinder hydraulic synchronous control system according to claim 1, characterized in that: The control handle is electrically connected to the controller, and the controller is electrically connected to the right cylinder piston rod position sensor and the left cylinder piston rod position sensor, respectively.

5. The heavy-duty forklift hopper dual-cylinder hydraulic synchronous control system according to claim 1, characterized in that: The first speed control valve consists of an adjustable flow valve, a check valve, and a two-position two-way valve.

6. The heavy-duty forklift hopper dual-cylinder hydraulic synchronous control system according to claim 5, characterized in that: The first speed control valve, the second speed control valve, the third speed control valve, and the fourth speed control valve are all of the same model.

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