Power reversing electro-hydraulic control system

Abstract

The utility model discloses a power reversing electro-hydraulic control system, which relates to the technical field of tractor control and comprises a chassis, a PTO control valve block and a reversing control valve block, the PTO control valve block is used for adjusting oil output pressure and PTO mode switching, and the reversing control valve block is used for controlling a tractor to move forward and backward. The chassis is connected with the PTO control valve block through a first oil inlet P pipeline, and the PTO control valve block is connected with the reversing control valve block through a second oil inlet P pipeline. According to the power reversing electro-hydraulic control system, through the PTO control valve block and the reversing control valve block, a user does not need to manually shift gears to control a tractor to move forwards and backwards, manual control over the output state and the cut-off state of rear power can be avoided, operation steps are reduced, and then operation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of tractor control technology, specifically a power commutation electro-hydraulic control system. Background Technology

[0002] Currently, both forward and reverse movement of tractors are controlled manually, which increases the complexity of driving for the driver. Furthermore, the output and disconnection of the rear power of tractors generally use a sliding sleeve engagement method. The movement of the sliding sleeve is controlled by a control lever. When working, the sliding sleeve outputs power from the shaft to the rear power source. When not working, it is in neutral and disconnects the rear power output. The output and disconnection of the rear power source are also manually operated, further increasing the complexity of driving for the driver. In practical use, this is obviously inconvenient and has shortcomings, and it is necessary to improve it.

[0003] Based on this, a power commutation electro-hydraulic control system is now provided, which can eliminate the drawbacks of existing technical solutions. Utility Model Content

[0004] The purpose of this utility model is to provide a power reversing electro-hydraulic control system to solve the problem in the background art that the manual shifting of the tractor to move forward and backward and the manual operation of the output and cut-off of the rear power increase the cumbersomeness of driving the tractor.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A power directional electro-hydraulic control system includes a chassis, a PTO control valve block, and a reversing control valve block. The PTO control valve block is used to adjust the hydraulic output pressure and switch the PTO mode. The reversing control valve block is used to operate the tractor to perform forward and reverse operations. The chassis and the PTO control valve block are connected through a first oil inlet pipe P, and the PTO control valve block and the reversing control valve block are connected through a second oil inlet pipe P.

[0007] Preferably, the PTO control valve block includes a pressure reducing valve, a first relief valve, a first proportional valve, and a switching valve. The other end of the first inlet P pipe is connected to the pressure reducing valve. A first relief pipe is connected to the first inlet P pipe, and the other end of the first relief pipe is connected to the first relief valve. The overflow port of the first relief valve is connected to a first return port T2 pipe. The pressure reducing valve is connected to the first return port T2 pipe through a first branch pipe. The output end of the pressure reducing valve is fixedly connected to an outlet A pipe. The outlet A pipe is connected to the inlet of the first proportional valve through a second branch pipe. The return port of the first proportional valve is connected to a first return port T1 pipe. The first proportional valve is connected to the inlet of the switching valve. A first return pipe is connected to the switching valve. The return port of the switching valve is connected to a first return port T3 pipe. The outlet of the switching valve is connected to an outlet C pipe. One end of the outlet A pipe is connected to the second inlet P pipe.

[0008] Preferably, the reversing control valve block includes a reversing valve, a second relief valve, a second proportional valve, and a shut-off valve. The inlet of the shut-off valve is connected to the first inlet P pipe. A second return pipe is connected to the shut-off valve, and the other end of the second return pipe is connected to the second return port T1 pipe. The outlet of the shut-off valve is connected to the reversing valve through a first inlet pipe. The return port of the reversing valve is connected to the second return port T1 pipe and the second return port T2 pipe. The first inlet pipe is connected to the second relief valve through a second relief pipe. The overflow port of the second relief valve is connected to the return port T4 pipe. A second inlet pipe is also connected to the first inlet P pipe. The other end of the second inlet pipe is connected to the second proportional valve. The return port of the second proportional valve is connected to the second return port T3 pipe. The second proportional valve and the second relief valve are connected through a third branch pipe.

[0009] Preferably, the reversing valve has two positions, one of which is set to B1 reverse position, which is connected to the oil outlet R pipe, and the other position is set to A1 forward position, which is connected to the oil outlet F pipe.

[0010] Preferably, a coarse filter, a gear pump, and a fine filter are sequentially arranged on the first oil inlet P pipe, and the fine filter is located on the side of the coarse filter near the PTO control valve block.

[0011] Preferably, a high-pressure pump is installed on the second oil inlet P pipe.

[0012] Preferably, both the first proportional valve and the second proportional valve are electrically connected to the clutch pedal, and the shut-off valve is also electrically connected to the clutch pedal.

[0013] Preferably, the reversing valve is electrically connected to the reversing handle.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] In this invention, the PTO control valve block and the reversing control valve block allow the user to operate the tractor forward and backward without manually shifting gears, and also eliminate the need for manual operation of the rear power output and cut-off state, reducing operating steps and simplifying the tractor driving process. In addition, the system adopts an electro-hydraulic control system, which is more precise and has a faster response speed, making it easier to improve work efficiency and has good application prospects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the PTO control valve block of this utility model.

[0019] Figure 4 This is a schematic diagram of the reversing control valve block of this utility model.

[0020] Figure reference numerals: Chassis 101, First oil inlet P pipe 102, Second oil inlet P pipe 103, Coarse filter 104, Gear pump 105, Fine filter 106, High-pressure pump 107, PTO control valve block 200, Pressure reducing valve 201, First overflow valve 202, First proportional valve 203, Switch valve 204, First overflow pipe 205, First return oil port T2 pipe 206, Oil outlet A pipe 207, First return oil port T1 pipe 208, First return pipe 209, First return oil... Pipeline T3 210, outlet C pipe 211, reversing control valve block 300, reversing valve 301, second overflow valve 302, second proportional valve 303, shut-off valve 304, second return pipe 305, second return port T1 pipe 306, first inlet pipe 307, second return port T2 pipe 308, second overflow pipe 309, return port T4 pipe 310, second inlet pipe 311, second return port T3 pipe 312, outlet R pipe 313, outlet F pipe 314. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] In this embodiment, as Figures 1-4As shown, a power reversing electro-hydraulic control system includes a chassis 101, a PTO control valve block 200, and a reversing control valve block 300. The chassis 101 is internally equipped with an oil tank, a rear-mounted power unit, and forward / reverse power units. The PTO control valve block 200 is used to adjust the hydraulic output pressure to facilitate the operation of the rear-mounted power unit. The reversing control valve block 300 is used to operate the tractor to perform forward and reverse operations without the need for clutch operation, thus reducing labor intensity. The chassis 101 and the PTO control valve block 200 are connected through a first oil inlet P pipe 102, and the PTO control valve block 200 and the reversing control valve block 300 are connected through a second oil inlet P pipe 103 to facilitate the delivery of hydraulic fluid to the corresponding valve blocks.

[0023] Among them, such as Figures 1-4As shown, the PTO control valve block 200 includes a pressure reducing valve 201, a first relief valve 202, a first proportional valve 203, and a switching valve 204. When the rear-mounted power unit is not working, the PTO control valve block 200 is in a cut-off state; when the rear-mounted power unit is working, the PTO control valve block 200 is in a regulating state. The PTO control valve block 200 has two operating modes: one is maximum output pressure, which does not require adjustment of the oil pressure through the first proportional valve 203; the other is to adjust the oil pressure at the outlet C pipe 211 by controlling the current of the first proportional valve 203 through the clutch pedal. The other end of the first inlet P pipe 102 is connected to the pressure reducing valve 201. A first overflow pipe 205 is connected to the oil inlet P pipe 102. The other end of the first overflow pipe 205 is connected to the first overflow valve 202. The overflow port of the first overflow valve 202 is connected to the first return port T2 pipe 206. The pressure reducing valve 201 is connected to the first return port T2 pipe 206 through the first branch pipe. The output end of the pressure reducing valve 201 is fixedly connected to the oil outlet A pipe 207. The oil outlet A pipe 207 is connected to the oil inlet of the first proportional valve 203 through the second branch pipe. The first proportional valve 203 is electro-hydraulic controlled and has the advantages of high precision, high reliability, and low cost. The opening of the first proportional valve 203 can be proportionally controlled by the control current. The size is designed to facilitate adjustment of the output hydraulic pressure. The diameter of the second branch pipe is 1.7 inches. The return port of the first proportional valve 203 is connected to the first return port T1 pipe 208, which has a nominal diameter of 1.1 inches. The first proportional valve 203 is connected to the inlet of the switch valve 204. The switch valve 204 is used to control the flow of hydraulic fluid, opening or closing the flow of hydraulic fluid in the pipeline, thereby controlling the working state of the hydraulic system. This ensures that the hydraulic fluid can flow when needed and can be completely cut off when not needed, thus ensuring the efficient and safe operation of the control system. The switch valve 204 is connected to the first return pipe 20. 9. The return port of the switch valve 204 is connected to the first return port T3 pipe 210, and the outlet port of the switch valve 204 is connected to the outlet port C pipe 211. One end of the outlet port A pipe 207 is connected to the second inlet port P pipe 103. In this embodiment, both the return port and the first inlet port P pipe 102 are connected to the oil tank. Excess oil is transported to the inside of the oil tank through the return pipe to ensure the normal operation of the system. The outlet port C pipe 211 is connected to the rear power unit of the tractor. The user does not need to manually operate the output and cut-off operation of the rear power unit, making the operation more flexible and convenient, greatly reducing the driver's burden and improving the work efficiency.

[0024] Among them, such as Figure 2 and Figure 4As shown, the reversing control valve block 300 includes a reversing valve 301, a second overflow valve 302, a second proportional valve 303, and a shut-off valve 304. The shut-off valve 304 is controlled by the clutch pedal (not shown in the figure). When the shut-off valve 304 is energized and opened, it can cut off the flow of oil, allowing excess oil to flow back to the oil tank inside the chassis 101 through the second return pipe 305, thereby reducing the system pressure. When the shut-off valve 304 is de-energized and closed, oil will enter the reversing valve 301 through the first oil inlet pipe 307, facilitating subsequent operation of the tow truck by the user. When the tractor performs forward and reverse operations, the oil inlet of the shut-off valve 304 is connected to the first oil inlet P pipe 102. A second return pipe 305 is connected to the shut-off valve 304, and the other end of the second return pipe 305 is connected to the second return port T1 pipe 306. The oil outlet of the shut-off valve 304 is connected to the reversing valve 301 through the first oil inlet pipe 307. The nominal diameter of the pipe at the first oil inlet pipe 307 is 1.35 inches, and the oil flow rate is 4 L / min. The return port of the reversing valve 301 is connected to the second return port T1. Pipeline 306 and the second return port T2 pipeline 308, and the first oil inlet pipe 307 are connected to the second overflow valve 302 via the second overflow pipe 309. The second overflow valve 302 controls the internal pressure of the first oil inlet pipe 307, and part of the oil flows back to the oil tank through the return port T4 pipeline 310 to maintain the working pressure balance of the system and prevent the oil pressure in the system pipeline from exceeding the rated load, thus playing a safety protection role. The overflow port of the second overflow valve 302 is connected to the return port T4 pipeline 310 and the first oil inlet P pipeline 1. The 02 is also connected to a second oil inlet pipe 311, which has a nominal diameter of 1.15 inches and an oil flow rate of 3 L / min. The other end of the second oil inlet pipe 311 is connected to a second proportional valve 303. The return port of the second proportional valve 303 is connected to a second return port T3 pipe 312, which has a diameter of 1.1 inches. The second proportional valve 303 and the second relief valve 302 are connected through a third branch pipe, which has a diameter of 0.8 inches.

[0025] Among them, such as Figure 4 As shown, the reversing valve 301 has two positions. One position is set to B1 reverse position, which is connected to the oil outlet R pipe 313. The other position is set to A1 forward position, which is connected to the oil outlet F pipe 314. The reversing valve 301 is controlled by a reversing handle. When the reversing handle is turned to A1 forward position, A1 forward position is energized, which causes the oil to be discharged through the oil outlet F pipe 314. When the reversing handle is turned to B1 reverse position, B1 reverse position is energized, which causes the oil to be discharged through the oil outlet R pipe 313. Both the oil outlet F pipe 314 and the oil outlet R pipe 313 are connected to the forward and reverse power components of the tractor.

[0026] Among them, such as Figure 1 and Figure 2 As shown, a coarse filter 104, a gear pump 105, and a fine filter 106 are sequentially arranged on the first oil inlet P pipe 102. The coarse filter 104 is used to filter out larger particles. The fine filter 106 is located on the side of the coarse filter 104 near the PTO control valve block 200. The fine filter 106 usually uses a paper filter element. It is used to filter out small impurities and particles in the oil to ensure the cleanliness of the oil and protect the various parts of the tractor from wear and damage. The gear pump 105 is formed by a gear pump body and other components. After operation, it generates low pressure and then produces suction, which in turn delivers the oil to each oil inlet.

[0027] Among them, such as Figure 1 As shown, a high-pressure pump 107 is installed on the second oil inlet P pipe 103 to pressurize the oil to a high-pressure state, thereby achieving the oil injection effect. This increases the fuel supply to the tractor's engine.

[0028] Among them, such as Figure 1 As shown, both the first proportional valve 203 and the second proportional valve 303 are electrically connected to the clutch pedal, and the shut-off valve 304 is also electrically connected to the clutch pedal, ensuring the overall practicality of the system.

[0029] Among them, such as Figure 1 As shown, the reversing valve 301 is electrically connected to the reversing handle, which facilitates the control of the reversing valve 301.

[0030] In operation, the oil passes through the coarse filter 104 for primary coarse filtration and then enters the gear pump 105. The gear pump 105 outputs the oil to the fine filter 106 for further filtration. The finely filtered oil then enters the PTO control valve block 200 through the first inlet P pipe 102. After passing through the pressure reducing valve 201, the oil enters the first proportional valve 203. The current of the first proportional valve 203 is controlled by the clutch pedal to regulate the oil pressure at the outlet C pipe 211, which facilitates the control of the working state of the rear-mounted power unit. The oil then enters the reversing control valve block 300 through the outlet A pipe 207 and the second inlet P pipe 103. The shut-off valve 304 is controlled by the clutch pedal, so that when the shut-off valve 304 is energized, it can cut off the oil flow. When it is de-energized, the oil will enter the reversing valve 301. The reversing lever controls the gear position of the reversing valve 301 to realize the forward and reverse operation of the tractor.

[0031] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power commutation electro-hydraulic control system, characterized in that, The system includes a chassis (101), a PTO control valve block (200), and a reversing control valve block (300). The PTO control valve block (200) is used to adjust the oil output pressure and switch the PTO mode. The reversing control valve block (300) is used to operate the tractor to perform forward and reverse operations. The chassis (101) and the PTO control valve block (200) are connected through a first oil inlet P pipe (102). The PTO control valve block (200) and the reversing control valve block (300) are connected through a second oil inlet P pipe (103).

2. The power commutation electro-hydraulic control system according to claim 1, characterized in that, The PTO control valve block (200) includes a pressure reducing valve (201), a first relief valve (202), a first proportional valve (203), and a switching valve (204). The other end of the first inlet P pipe (102) is connected to the pressure reducing valve (201). A first relief pipe (205) is connected to the first inlet P pipe (102). The other end of the first relief pipe (205) is connected to the first relief valve (202). The overflow port of the first relief valve (202) is connected to the first return port T2 pipe (206). The pressure reducing valve (201) is connected to the first return port T2 pipe (206) through a first branch pipe. The output end of the pressure reducing valve (201) is fixedly connected to... There is an oil outlet pipe A (207), which is connected to the oil inlet of the first proportional valve (203) through a second branch pipe. The oil return port of the first proportional valve (203) is connected to the first oil return port T1 pipe (208). The first proportional valve (203) is connected to the oil inlet of the switch valve (204). The switch valve (204) is connected to the first return pipe (209). The oil return port of the switch valve (204) is connected to the first oil return port T3 pipe (210). The oil outlet of the switch valve (204) is connected to the oil outlet C pipe (211). One end of the oil outlet pipe A (207) is connected to the second oil inlet P pipe (103).

3. The power commutation electro-hydraulic control system according to claim 2, characterized in that, The reversing control valve block (300) includes a reversing valve (301), a second relief valve (302), a second proportional valve (303), and a shut-off valve (304). The oil inlet of the shut-off valve (304) is connected to the first oil inlet P pipe (102). A second return pipe (305) is connected to the shut-off valve (304), and the other end of the second return pipe (305) is connected to the second return oil port T1 pipe (306). The oil outlet of the shut-off valve (304) is connected to the reversing valve (301) through the first oil inlet pipe (307). The return oil port of the reversing valve (301) is connected to the second return oil port T1 pipe (306) and... The second return port T2 pipe (308) is connected to the first inlet pipe (307) via the second overflow pipe (309) and the second overflow valve (302). The overflow port of the second overflow valve (302) is connected to the return port T4 pipe (310). The first inlet port P pipe (102) is also connected to the second inlet pipe (311). The other end of the second inlet pipe (311) is connected to the second proportional valve (303). The return port of the second proportional valve (303) is connected to the second return port T3 pipe (312). The second proportional valve (303) and the second overflow valve (302) are connected via the third branch pipe.

4. The power commutation electro-hydraulic control system according to claim 3, characterized in that, The reversing valve (301) has two positions, one of which is set to B1 reverse position, which is connected to the oil outlet R pipe (313), and the other position is set to A1 forward position, which is connected to the oil outlet F pipe (314).

5. The power commutation electro-hydraulic control system according to claim 1, characterized in that, A coarse filter (104), a gear pump (105) and a fine filter (106) are sequentially arranged on the first oil inlet P pipe (102). The fine filter (106) is located on the side of the coarse filter (104) close to the PTO control valve block (200).

6. The power commutation electro-hydraulic control system according to claim 1, characterized in that, A high-pressure pump (107) is installed on the second oil inlet P pipe (103).

7. The power commutation electro-hydraulic control system according to claim 3, characterized in that, The first proportional valve (203) and the second proportional valve (303) are both electrically connected to the clutch pedal, and the shut-off valve (304) is also electrically connected to the clutch pedal.

8. The power commutation electro-hydraulic control system according to claim 3, characterized in that, The reversing valve (301) is electrically connected to the reversing handle.

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