Hydrostatic travel dual power control system

Abstract

The present invention relates to the field of engineering machinery control systems, and in particular to a hydrostatic dual-power travel control system, including a chassis, a travel mechanism, a pumping mechanism, and a hydraulic control system, wherein the hydraulic control system includes a closed hydraulic system and an open hydraulic system. The closed hydraulic system uses an engine to drive a closed plunger pump to control a travel motor to achieve travel; the open hydraulic system uses an electric motor to drive an open plunger pump to control a travel motor to achieve travel. The present invention integrates a motor-driven open hydraulic system into an engine-driven closed hydraulic system by using a reversing valve group and a balancing valve group to achieve control of the travel motor, thereby realizing the use of dual power drives of an engine and a motor to complete the travel function. The remote control can be used for remote operation without starting the engine, and the start-stop response speed is fast. At the same time, there is no exhaust emission, which reduces pollution to the working environment, improves the working environment, and reduces the cost of use.

Description

Technical Field

[0001] The invention relates to the field of engineering machinery control systems, and in particular to a hydrostatic travel dual-power control system. Background Art

[0002] The shotcrete trolley is a professional construction machinery, which is mainly used for concrete spraying operations at construction sites such as tunnels, road slope protection, and building foundation pits. In the prior art shotcrete trolley, the chassis driving system is usually powered by an engine (such as a diesel engine) to realize the driving function of the equipment, and the concrete spraying operation is mainly completed by the hydraulic transmission system driven by the electric motor. Through the combination of the two power systems of the engine and the electric motor, efficient operation in complex construction environments can be achieved. However, when the shotcrete trolley is in operation, it is usually remotely operated using a remote control. After the shotcrete operation at the current workstation is completed, the vehicle needs to be moved. It is necessary to turn off the motor and then start the engine to move the vehicle. After moving the vehicle, turn off the engine again, restart the motor and then operate again. The operation process is relatively cumbersome.

[0003] The invention patent with the authorization announcement number CN110318779B discloses a wet spraying trolley, which has a hydraulic transmission system and a travel system on its chassis. The wet spraying trolley also includes a spraying mechanism, and the spraying mechanism and the travel system are selectively connected to the engine through the hydraulic transmission system, so that they can be driven by the engine for travel and / or spraying operations. However, the maintenance cost and operation complexity of the engine are often relatively high, requiring more professional technical support and regular maintenance, and may increase the failure rate. Once the engine has a problem, it will affect the driving and operation functions of the entire equipment. In addition, excessive use of the engine also has a certain impact on the environment. Summary of the invention

[0004] Technical purpose: In order to overcome the deficiencies in the prior art, the present invention provides a hydrostatic travel dual-power control system, which utilizes an electric motor to drive an open hydraulic system to complete the concrete spraying operation and the vehicle moving function during the operation.

[0005] Technical solution: To achieve the above-mentioned purpose, the static hydraulic travel dual-power control system disclosed in the present invention includes a chassis, a travel mechanism arranged under the chassis, and a pumping mechanism arranged above the chassis, and also includes a hydraulic control system, the hydraulic control system includes a closed hydraulic system and an open hydraulic system; the closed hydraulic system includes a closed hydraulic oil tank, a closed plunger pump, an engine and a travel motor connected by hydraulic pipes, and the closed hydraulic system uses the engine to drive the closed plunger pump to complete the control of the travel motor to achieve walking; the open hydraulic system includes an open hydraulic oil tank, an open plunger pump and a motor connected by hydraulic pipes, and the open hydraulic system uses the motor to drive the open plunger pump to complete the control of the travel motor to achieve walking.

[0006] Furthermore, the closed hydraulic system also includes a reversing valve group arranged between the closed plunger pump and the travel motor. When the engine is used to drive the travel, the reversing valve group acts in a passage state, and when the motor is used to drive the travel, the reversing valve group is in an open circuit state.

[0007] Furthermore, a flushing valve, a radiator and an oil return filter are sequentially arranged between the oil outlet of the closed plunger pump and the closed hydraulic oil tank; a first oil suction filter is also arranged between the oil inlet of the closed plunger pump and the closed hydraulic oil tank.

[0008] Furthermore, an electromagnetic reversing valve is provided between the travel motor and the closed hydraulic oil tank, and two electromagnetic reversing valves are provided, namely a first electromagnetic reversing valve and a second electromagnetic reversing valve.

[0009] Furthermore, the closed hydraulic system also includes a three-way proportional pressure reducing valve, which is connected to the reversing control valve of the closed plunger pump. When the electromagnet Y3 of the three-way proportional pressure reducing valve is energized, it is the forward gear, and when the electromagnet Y2 is energized, it is the reverse gear.

[0010] Furthermore, the open hydraulic system also includes an electric proportional reversing valve, and the electric proportional reversing valve is connected to the first electromagnetic reversing valve.

[0011] Furthermore, a balancing valve group is provided between the electric proportional reversing valve and the travel motor, and the balancing valve group is connected to the reversing valve group;

[0012] When the engine is used to drive the vehicle, ports C1 and C2 of the balancing valve group are blocked by the balancing valve, so that the high-pressure oil of the closed hydraulic system cannot enter the open hydraulic system.

[0013] When the motor is used to drive walking, the pressure oil enters the C port of the reversing valve group through the V1 port or V2 port of the balancing valve group, overcoming the valve core spring force. The reversing valve group is in an open-circuit state, so that the high-pressure oil of the open hydraulic system cannot enter the closed hydraulic system.

[0014] Furthermore, a second oil suction filter is provided between the open hydraulic oil tank and the open plunger pump.

[0015] The hydrostatic travel dual power control system of the present invention has at least the following technical effects:

[0016] By integrating the motor-driven open hydraulic system into the engine-driven closed hydraulic system through the reversing valve group and the balancing valve group, the travel motor can be controlled, and the dual power drive of the engine and the motor is realized to complete the driving function. By using the motor to drive the vehicle to move during the operation, the remote control can be used for remote operation without starting the engine. The start and stop response speed is fast, which simplifies the operation process. At the same time, there is no exhaust emission, which reduces the pollution of the working environment, improves the working environment, and reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a hydraulic principle diagram of the static hydraulic travel dual power control system of the present invention.

[0018] In the figure, 1. closed hydraulic oil tank; 2. first oil suction filter; 3. closed plunger pump; 4. engine; 5. three-way proportional pressure reducing valve; 6. flushing valve; 7. reversing valve group; 9. balancing valve group; 10. first solenoid reversing valve; 11. second solenoid reversing valve; 12. radiator; 13. return oil filter; 14. electric proportional reversing valve; 15. open plunger pump; 16. motor; 17. second oil suction filter; 18. travel motor; 19. open hydraulic oil tank. DETAILED DESCRIPTION

[0019] The following combination Figure 1 The principles and features of the present invention are described, and the examples given are only used to explain the present invention, rather than to limit the scope of the present invention.

[0020] The hydrostatic travel dual-power control system comprises a chassis, a travel mechanism arranged below the chassis, a pumping mechanism arranged above the chassis, and a hydraulic control system. The hydraulic control system comprises a closed hydraulic system and an open hydraulic system.

[0021] The closed hydraulic system includes a closed hydraulic oil tank 1, a first oil suction filter 2, a closed plunger pump 3, an engine 4, a three-way proportional pressure reducing valve 5, a flushing valve 6, a reversing valve group 7, a balancing valve group 9, a radiator 12, an oil return filter 13, a travel motor 18 and an electromagnetic reversing valve connected by hydraulic pipes. The closed hydraulic system uses the engine 4 to drive the closed plunger pump 3 to complete the power transmission to the travel motor 18, and at the same time controls the three-way proportional pressure reducing valve 5 to achieve the travel of the vehicle.

[0022] Among them, the first oil suction filter 2 is arranged between the oil inlet of the closed plunger pump 3 and the closed hydraulic oil tank 1; the flushing valve 6, the radiator 12 and the return oil filter 13 are arranged between the oil outlet of the closed plunger pump 3 and the closed hydraulic oil tank 1 in sequence. The reversing valve group 7 is arranged between the closed plunger pump 3 and the travel motor 18. When the engine 4 is used to drive the travel, the reversing valve group 7 acts in the passage state. When the motor 16 is used to drive the travel, the reversing valve group 7 is in the disconnection state. The electromagnetic reversing valve is arranged between the travel motor 18 and the closed hydraulic oil tank 1. There are two electromagnetic reversing valves, namely the first electromagnetic reversing valve 10 and the second electromagnetic reversing valve 11. The three-way proportional pressure reducing valve 5 is connected to the reversing control valve of the closed plunger pump 3. When the electromagnet Y3 of the three-way proportional pressure reducing valve 5 is energized, it is the forward gear, and when the electromagnet Y2 is energized, it is the reverse gear.

[0023] The open hydraulic system includes an electric proportional reversing valve 14, an open plunger pump 15, a motor 16, a second oil suction filter 17 and an open hydraulic oil tank 19 connected by hydraulic pipes. The open hydraulic system uses the motor 16 to drive the open plunger pump 15 to complete the power transmission to the travel motor 18, and at the same time controls the electric proportional reversing valve 14 to realize the travel of the vehicle.

[0024] The second oil suction filter 17 is arranged between the open hydraulic oil tank 19 and the open plunger pump 15 , and the electric proportional reversing valve 14 is connected to the first electromagnetic reversing valve 10 .

[0025] A balancing valve group 9 is also provided between the electric proportional reversing valve 14 and the travel motor 18, and the balancing valve group 9 is also connected to the reversing valve group 7. When the engine 4 is used to drive the travel, the C1 and C2 ports of the balancing valve group 9 are blocked due to the action of the balancing valve, so that the high-pressure oil of the closed hydraulic system cannot enter the open hydraulic system; when the motor 16 is used to drive the travel, the pressure oil enters the C port of the reversing valve group 7 through the V1 port or V2 port of the balancing valve group 9, overcoming the valve core spring force, and the reversing valve group 7 is in an open circuit state, so that the high-pressure oil of the open hydraulic system cannot enter the closed hydraulic system. At the same time, the pressure oil entering through the V1 port or V2 port controls the oil circuit inside the balancing valve group 9, and the one-way valve opens to make the balancing valve group 9 overcome the spring force and move the valve core, so that the pressure oil flows through the balancing valve group 9 to the travel motor 18.

[0026] The working process of the static hydraulic travel dual power control system of the present invention is:

[0027] When the engine 4 is used to drive the vehicle in the walking state, the S port of the closed plunger pump 3 draws oil from the closed hydraulic oil tank 1 through the first oil suction filter 2; because there is no pressure oil at the C port of the reversing valve group 7 to overcome the valve core spring force, the reversing valve group 7 acts in the passage state; the high-pressure working oil ports A and B of the closed plunger pump 3 enter the walking motor 18 through the reversing valve group 7; part of the hydraulic oil enters the radiator 12 through the flushing valve 6, and the hydraulic oil after heat dissipation and cooling returns to the closed hydraulic oil tank 1 through the return oil filter 13; the C1 and C2 ports of the balancing valve group 9 are blocked due to the action of the balancing valve, so that the high-pressure oil of the closed hydraulic system cannot enter the electric proportional reversing valve 14; at this time, the first solenoid reversing valve 10 and the second solenoid reversing valve 11 are not energized, and the valve cores are working in the upper position, so that the leakage oil of the walking motor 18 also enters the closed hydraulic oil tank 1. In this state, the vehicle's moving direction is realized by energizing the electromagnets Y3 and Y2 of the three-way proportional pressure reducing valve 5. When the electromagnet Y3 is energized, it is the forward gear, and when the electromagnet Y2 is energized, it is the reverse gear.

[0028] When the motor 16 is used to drive the travel state, the S port of the open plunger pump 15 sucks oil from the open hydraulic oil tank 19 through the second oil suction filter 17; the first solenoid reversing valve 10 and the second solenoid reversing valve 11 are energized, both of which work in the lower position of the valve core, and the leakage oil of the travel motor 18 enters the open hydraulic oil tank 19 because the second solenoid reversing valve 11 works in the lower position; the first solenoid reversing valve 10 works in the lower position, and the pilot pressure oil enters the control port X of the travel motor 18 through the first solenoid reversing valve 10, so that the travel motor 18 enters the high-speed mode; when the remote control operation causes the electric proportional reversing valve 14 to control the electromagnet to act accordingly, the open plunger pump 1 5 outputs pressure oil, which enters the travel motor 18 through the electric proportional reversing valve 14; at this time, pressure oil from the V1 port or V2 port of the balancing valve group 9 enters the C port of the reversing valve group 7, overcoming the valve core spring force, making the reversing valve group 7 in an open circuit state; in this way, the pressure oil entering from the V1 port or V2 port of the balancing valve group 9 controls the oil circuit inside the balancing valve group 9, and the one-way valve opens to make the balancing valve group 9 overcome the spring force and move the valve core, so that the pressure oil flows through the balancing valve group 9 to the travel motor 18, while the connection with the A and B ports of the closed plunger pump 3 of the closed hydraulic system is blocked by the reversing valve group 7, so that the oil of the open hydraulic system cannot enter the closed hydraulic system. At this time, the travel direction of the vehicle is realized by the electromagnet of the electric proportional reversing valve 14 being energized to realize the forward / reverse / stop of the vehicle.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrostatic dual-power travel control system, comprising a chassis, a travel mechanism disposed below the chassis, and a pumping mechanism disposed above the chassis, characterized in that: The invention also includes a hydraulic control system, wherein the hydraulic control system includes a closed hydraulic system and an open hydraulic system; the closed hydraulic system includes a closed hydraulic oil tank (1), a closed plunger pump (3), an engine (4), and a travel motor (18) connected by hydraulic pipelines, and the closed hydraulic system uses the engine (4) to drive the closed plunger pump (3) to complete the control of the travel motor (18) to achieve walking; the open hydraulic system includes an open hydraulic oil tank (19), an open plunger pump (15), and a motor (16) connected by hydraulic pipelines, and the open hydraulic system uses the motor (16) to drive the open plunger pump (15) to complete the control of the travel motor (18) to achieve walking; The closed hydraulic system further comprises a reversing valve group (7) arranged between the closed plunger pump (3) and the travel motor (18); when the engine (4) is used to drive the travel, the reversing valve group (7) acts in a passage state; when the motor (16) is used to drive the travel, the reversing valve group (7) is in a circuit-breaking state; a flushing valve (6), a radiator (12) and an oil return filter (13) are arranged in sequence between the oil outlet of the closed plunger pump (3) and the closed hydraulic oil tank (1); the oil inlet of the closed plunger pump (3) and the oil return filter (13) are connected to the oil inlet of the closed plunger pump (3). A first oil suction filter (2) is also arranged between the closed hydraulic oil tank (1); an electromagnetic reversing valve is arranged between the travel motor (18) and the closed hydraulic oil tank (1), and two electromagnetic reversing valves are arranged, namely a first electromagnetic reversing valve (10) and a second electromagnetic reversing valve (11); the closed hydraulic system also includes a three-way proportional pressure reducing valve (5), and the three-way proportional pressure reducing valve (5) is connected to the reversing control valve of the closed plunger pump (3), and when the electromagnet Y3 of the three-way proportional pressure reducing valve (5) is energized, it is a forward gear, and when the electromagnet Y2 is energized, it is a reverse gear; The open hydraulic system further comprises an electric proportional reversing valve (14), the electric proportional reversing valve (14) being connected to the first electromagnetic reversing valve (10); a balancing valve group (9) being arranged between the electric proportional reversing valve (14) and the travel motor (18), the balancing valve group (9) being connected to the reversing valve group (7); when the engine (4) is used to drive the travel, ports C1 and C2 of the balancing valve group (9) are blocked due to the action of the balancing valve, so that the high-pressure oil of the closed hydraulic system cannot enter the open hydraulic system; when the motor (16) is used to drive the travel, the pressure oil enters port C of the reversing valve group (7) through port V1 or port V2 of the balancing valve group (9), overcoming the valve core spring force, and the reversing valve group (7) is in an open circuit state, so that the high-pressure oil of the open hydraulic system cannot enter the closed hydraulic system.

2. The hydrostatic dual-power control system according to claim 1 is characterized in that: A second oil suction filter (17) is also provided between the open hydraulic oil tank (19) and the open plunger pump (15).

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