Double-acting clutch electro-hydraulic control system for intelligent tractor

Abstract

The invention belongs to the technical field of tractor electro-hydraulic control, and particularly relates to an intelligent tractor double-acting clutch electro-hydraulic control system which comprises an oil tank, an oil suction filter, a gear pump, a high-pressure filter, a radiator, a control valve block, a clutch oil cylinder, a double-acting clutch, a hydraulic pipe and a button switch. The control valve block is composed of an electromagnetic valve, a pressure measuring connector I, a valve body, a throttling valve, a sequence valve, a one-way valve and a pressure measuring connector II. The double-acting clutch controlled by the double-acting clutch electro-hydraulic control system is a dry-type multi-friction-plate clutch, the cost of the double-acting clutch is lower than that of a wet-type clutch commonly used in the market, the double-acting clutch does not have a wet-type clutch, the requirement for the assembly process is high, and meanwhile the effect that the electric control wet-type clutch is convenient to operate and saves labor can be achieved; the operation quality and the operation efficiency of the tractor are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tractor electro-hydraulic control, and particularly relates to an intelligent dual-acting clutch electro-hydraulic control system for a tractor. BACKGROUND

[0002] With the continuous development of society, people's material living standards are continuously improved, and users have higher and higher requirements for the work efficiency and work quality of tractors, and more and more requirements for the comfort of operation and the intelligent degree of the whole machine. The mechanical operation tractors commonly existing on the market at present cannot meet the needs of users. When rotary plowing is performed on small plots in the south, the power output is frequently interrupted by frequent operation of the auxiliary clutch handle, and the driver is very tired and uncomfortable. The tractors on the market at present commonly adopt a single-acting clutch + electric control wet PTO clutch scheme, which realizes one-key operation of the electric control button and is convenient and labor-saving to operate. However, there is a big problem, that is, the wet clutch has a very high requirement for the cleanliness of hydraulic oil, and the current domestic production, processing and assembly conditions are difficult to meet the high requirement for cleanliness; at the same time, the wet clutch has a complex structure and multiple sealing ring seals inside, and has a high requirement for the assembly process, and a careless mistake can easily damage the sealing ring during assembly. In this way, the production cost is increased, the reliability in use is poor, faults are prone to occur, and the maintenance cost is high; therefore, in view of the above technical status, there is an urgent need for an intelligent tractor electro-hydraulic control scheme that is labor-saving in use, convenient to assemble and install, has a low requirement for cleanliness, has a low cost and high reliability to solve the above problems and meet the use requirements of users for tractors. SUMMARY

[0003] The purpose of the present application is to provide an intelligent dual-acting clutch electro-hydraulic control system for a tractor, which can effectively solve the above problems by means of electro-hydraulic control of a dual-acting mechanical clutch, improve the work quality and work efficiency of the tractor, and meet the intelligent and electric control requirements of users for the tractor.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme: The utility model provides an intelligent tractor with double -acting clutch electro -hydraulic control system, including oil tank, oil suction filter, gear pump, high pressure filter, radiator, control valve block, clutch cylinder, double -acting clutch, hydraulic pipe and button switch, the control valve block is composed of solenoid valve, pressure tap I, valve body, throttle valve, sequence valve, check valve and pressure tap II, the opening pressure of sequence valve is 1.6MPa, and the opening pressure of check valve is 0.5Mpa, be provided with two bolt holes on the valve body for fixing the valve body on the tractor box body side, the solenoid valve is arranged outward perpendicularly to the valve body horizontally to facilitate the connection of wiring harness, the sequence valve is arranged in the left position on the top surface of valve body to meet the control pressure of oil cylinder and keep at 1.6Mpa, the throttle valve is arranged in the middle part on the top surface of valve body to control the oil return flow size of clutch cylinder, and then control the clutch cylinder piston push -and -pull speed and the combination and separation time of double -acting clutch, the pressure tap I is arranged on the top surface of valve body to measure the total pressure of system, the pressure tap II is arranged on the right side of valve body to measure the pressure to clutch cylinder, the check valve is arranged on the lower end surface of valve body to protect the radiator and prevent the radiator from bursting due to excessive pressure after being blocked.

[0005] Further, the control valve block has five oil ports, i.e. a first working oil port P, a second working oil port A, a third working oil port T, a fourth working oil port T1 and a fifth working oil port T2. The first working oil port P is an oil inlet port of the system, and the hydraulic oil delivered by the gear pump enters the control valve block through the first working oil port P. The second working oil port A is connected with the left cavity of the clutch cylinder. The third working oil port T is connected with the radiator through a hydraulic pipeline to deliver the hydraulic oil into the radiator for heat dissipation. The fourth working oil port T1 connects the check valve with the oil tank, and when the check valve is opened, the hydraulic oil can flow into the oil tank through the fourth working oil port T1. The fifth working oil port T2 is an oil return port of the clutch cylinder, and when the clutch is separated from the combined state, the hydraulic oil of the clutch cylinder flows back to the oil tank through the fifth working oil port T2.

[0006] Further, when the electro-hydraulic control double-acting clutch hydraulic system is in a non-working state, the double-acting clutch is a normally combined clutch. The gear pump is connected with the gear chamber of the engine, and when the engine is running, the gear pump starts to work. The gear pump cavity forms a negative pressure to suck the hydraulic oil from the oil tank, which enters the gear pump through the oil suction filter. With the continuous rotation of the gear pump, the hydraulic oil in the pump cavity is delivered to the high-pressure filter, filtered again and then delivered to the control valve block. At this time, the control valve block is in a non-working state, i.e. the solenoid valve does not receive current, and the solenoid valve does not perform any action. The oil delivered by the gear pump enters the radiator through the sequence valve, and after heat dissipation, it returns to the oil tank. When the radiator fails and is blocked, the check valve is opened, and the hydraulic oil returns to the oil tank through the check valve, thereby starting the protection of the radiator and avoiding the explosion of the radiator due to excessive pressure.

[0007] Further, in the working state of the electro-hydraulic control double-acting clutch hydraulic system, the double-acting clutch is in the combined state, the electromagnetic valve is energized by operating the button switch, the electromagnetic valve moves right under the electromagnetic attraction, the left cavity of the valve core is connected with the oil inlet oil channel of the gear pump, and a passage is formed; under the action of the sequence valve, the oil inlet of the gear pump is instantaneously pressurized to 1.6 MPa, the oil flows into the left cavity of the clutch cylinder through the left cavity of the electromagnetic valve core, and the piston moves right to realize the separation of the clutch; at the same time, the excess oil continuously input by the gear pump flows into the radiator through the sequence valve, and flows back to the oil tank after heat dissipation; when the separation is completed and the combination is needed, the electromagnetic valve loses current by operating the button switch; the electromagnetic valve is de-energized, the valve core moves left, the oil cavity of the valve core disconnects the oil inlet oil channel of the gear pump, and the clutch cylinder is communicated with the oil tank through the right cavity of the valve core; the oil in the left cavity of the clutch cylinder returns to the oil tank through the electromagnetic valve and the throttle valve under the action of the return spring of the clutch, and the clutch is separated to be combined.

[0008] Further, the throttle valve can adjust the flow rate of the oil, the flow rate of the hydraulic oil is controlled by adjusting the throttle valve, and the speed of the oil cylinder return and the combination time of the clutch are further controlled.

[0009] The intelligent double-acting clutch electro-hydraulic control system for tractors has the advantages that the overall structure design is scientific, compared with the commonly used single-acting clutch + electric control wet type PTO clutch scheme, the double-acting clutch controlled by the double-acting clutch electro-hydraulic control system is a dry type multi-friction plate clutch, which has a lower cost than the wet type clutch commonly used on the market, and the double-acting clutch has a lower requirement on assembly process and cleanliness than the wet type clutch, and can achieve the effect of convenient and labor-saving operation of the electric control wet type clutch, improve the operation quality and efficiency of the tractor, and effectively meet the intelligent electric control demand of the user on the tractor. In summary, the intelligent tractor clutch control scheme has the advantages of low cost, low assembly process requirement, low clutch working environment requirement and convenient and labor-saving operation. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a control logic diagram of the double-acting clutch electro-hydraulic control system of the present application. Figure 2 It is a non-working state hydraulic principle diagram of the electro-hydraulic control double-acting clutch hydraulic system of the present application. Figure 3 It is a working state hydraulic principle diagram of the electro-hydraulic control double-acting clutch hydraulic system of the present application. Figure 4 It is a control valve block structure in the double-acting clutch electro-hydraulic control system of the present application. Figure 1 ; Figure 5 The control valve block structure in the double-acting clutch electro-hydraulic control system of the present invention Figure 2 ; The marked positions in the diagram are: 1-oil tank, 2-suction filter, 3-gear pump, 4-high pressure filter, 5-radiator, 6-control valve block, 7-clutch cylinder, 8-double-acting clutch, 9-solenoid valve, 10-throttle valve, 11-sequence valve, 12-check valve, 13-pressure test connector I, 14-valve body, 15-pressure test connector II. Detailed Implementation

[0011] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly or indirectly connected to the other element. When an element is referred to as "connected to" another element, it can be directly or indirectly connected to the other element. The terms "left" and "right" used in this application to indicate orientation are based on the specific structure shown in the accompanying drawings and do not constitute a limitation on the structure.

[0012] Specific Embodiment 1: As per the appendix to the specification of this invention Figure 1 To the instruction manual Figure 5 As shown, to address the problems of high assembly process requirements, high cleanliness requirements, inconvenient operation, high physical labor consumption, and reduced tractor operating efficiency associated with existing single-acting clutch + electronically controlled wet PTO clutch solutions, this invention provides an intelligent electro-hydraulic control system for a tractor's dual-acting clutch. This system includes: an oil tank 1, an oil suction filter 2, a gear pump 3, a high-pressure filter 4, a radiator 5, a control valve block 6, a clutch cylinder 7, a dual-acting clutch 8, hydraulic pipes, and push-button switches; as per the attached manual. Figure 2 The diagram shows the hydraulic principle of the electro-hydraulic double-acting clutch hydraulic system in its non-operating state, i.e., the initial state when the tractor starts. The double-acting clutch 8 is a normally engaged clutch. The gear pump 3 is connected to the engine gear chamber. When the engine starts, the gear pump 3 begins to work, creating a negative pressure within its chamber, drawing hydraulic oil from the oil tank 1. The oil passes through the suction filter 2 and enters the gear pump 3. As the gear pump 3 rotates continuously, it delivers the hydraulic oil from its chamber to the high-pressure filter 4, where it is filtered again and then delivered to the control valve block 6. Since the control valve block 6 is in a non-operating state at this time, the solenoid valve 9 receives no current and does not perform any action. The oil delivered by the gear pump 3 enters the radiator 5 through the sequence valve 11, and after cooling, returns to the oil tank 1. When the radiator 5 malfunctions and becomes blocked, the check valve 12 opens, allowing the hydraulic oil to return to the oil tank 1 via the check valve 12, thus protecting the radiator 5 and preventing it from bursting due to excessive pressure.

[0013] As per the instruction manual Figure 3 The diagram shows the hydraulic principle of the electro-hydraulic dual-acting clutch system in operation. When the engine starts, the dual-acting clutch 8 is engaged. The driver operates the push-button switch to energize the solenoid valve 9. The solenoid valve 9 moves to the right under electromagnetic attraction, connecting the left oil chamber of the valve core to the oil passage of the gear pump 3, forming a passage. Under the action of the sequence valve 11, the oil pressure in the gear pump 3 is momentarily increased to 1.6 MPa. The oil flows through the left chamber of the solenoid valve 9 into the left chamber of the clutch cylinder 7, pushing the piston to the right and disengaging the clutch. Simultaneously, excess oil continuously supplied by the gear pump 3 flows through the sequence valve 11 into the radiator 5, and after cooling, flows back to the oil tank 1. When disengagement is complete and re-engagement is needed, the driver operates the push-button switch to de-energize the solenoid valve 9. At this time, the operation proceeds as planned. Figure 2 As shown. When solenoid valve 9 is de-energized, the valve core moves to the left, cutting off the oil passage from gear pump 3 to the valve core's oil chamber, allowing clutch cylinder 7 to connect to oil tank 1 through the right chamber of the valve core. Oil in the left chamber of clutch cylinder 7, under the force of the clutch return spring, passes through solenoid valve 9 and then through throttle valve 10 back to oil tank 1, thus achieving clutch engagement. Throttle valve 10 can adjust the flow rate of hydraulic oil, thereby controlling the hydraulic oil flow rate, further controlling the return speed of clutch cylinder 7, and further controlling the clutch engagement time.

[0014] As per the instruction manual Figure 4 Instruction manual attached Figure 5 As shown, the control valve block 6 consists of a solenoid valve 9, a throttle valve 10, a sequence valve 11, a check valve 12, a pressure test connector I13, a valve body 14, and a pressure test connector II15. Two bolt holes are provided on the valve body 14 for fixing it to the side of the tractor housing. The solenoid valve 9 is arranged horizontally outwards perpendicular to the valve body 14. The sequence valve 11 is located on the left side of the top surface of the valve body 14. The throttle valve 10 is located in the middle of the top surface of the valve body 14. The pressure test connector I13, located on the top surface of the valve body 14, is used to measure the total system pressure. Measuring the system pressure here can help determine if there are leaks or other faults in the system. The pressure test connector II15 is located on the right side of the valve body 14 and is used to measure the pressure leading to the clutch cylinder 7. When the pressure value is less than the pressure maintained by the sequence valve 11 (1.6 MPa), this pressure test can be used to determine if there is a system fault. The check valve 12 is located on the lower end face of the valve body 14.

[0015] The control valve block 6 has five ports: specifically, the first working port P, the second working port A, the third working port T, the fourth working port T1, and the fifth working port T2. The first working port P is the system inlet, through which the hydraulic oil supplied by the gear pump 3 enters the control valve block 6. The second working port A is connected to the left chamber of the clutch cylinder 7. The third working port T is connected to the radiator 5 via a hydraulic line, supplying hydraulic oil to the radiator 5 for cooling. The fourth working port T1 connects the check valve 12 to the oil tank 1; when the check valve 12 is open, hydraulic oil can flow into the oil tank 1 through this port. The fifth working port T2 is the return port of the clutch cylinder 7, allowing the hydraulic oil in the clutch cylinder 7 to flow back to the oil tank 1 when the clutch transitions from disengagement to engagement.

[0016] Finally, it should be further explained that the intelligent tractor dual-acting clutch electro-hydraulic control system of the present invention, through innovative design of the hydraulic valve block, uses different principles to control the engagement and disengagement of the dry multi-friction plate dual-acting clutch. This system method differs from the commonly used methods for controlling wet clutches on the market, effectively reducing the operator's workload, and has low processing and installation costs, high reliability, convenient maintenance, and low maintenance costs. The application of this system can improve the tractor's operating quality and efficiency, and better meet users' control needs for intelligent tractors. The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A smart tractor with double acting clutch electro-hydraulic control system, characterized in that, Including oil tank (1), oil suction filter (2), gear pump (3), high pressure filter (4), radiator (5), control valve block (6), clutch cylinder (7), double-acting clutch (8), hydraulic pipe and button switch;The control valve block (6) is composed of electromagnetic valve (9), valve body (14), throttle valve (10), sequence valve (11), check valve (12), pressure measuring connector I (13) and pressure measuring connector II (15);The opening pressure of the sequence valve (11) is 1.6 MPa, and the opening pressure of the check valve (12) is 0.5 Mpa;Two bolt holes are provided on the valve body (14) for fixing the valve body (14) to the side of the tractor box;The electromagnetic valve (9) is arranged horizontally outward perpendicular to the valve body (14) to facilitate the connection of the wiring harness;The sequence valve (11) is arranged on the top left side of the valve body (14) to meet the requirement that the cylinder control pressure is kept at 1.6 Mpa;The throttle valve (10) is arranged on the top middle part of the valve body (14) to control the oil return flow size of the clutch cylinder (7), and then control the push-pull speed of the cylinder piston and the combination and separation time of the double-acting clutch (8);The pressure measuring connector I (13) is arranged on the top of the valve body (14) for measuring the total pressure of the system;The pressure measuring connector II (15) is arranged on the right side of the valve body (14) for measuring the pressure to the clutch cylinder (7);The check valve (12) is arranged on the lower end face of the valve body (14) to protect the radiator (5) and prevent the radiator (5) from bursting due to excessive pressure after being blocked.

2. The electro-hydraulic control system for a double-acting clutch of an intelligent tractor according to claim 1, characterized in that, The control valve block (6) has five oil ports, namely the first working oil port P, the second working oil port A, the third working oil port T, the fourth working oil port T1 and the fifth working oil port T2;Among them, the first working oil port P is the oil inlet of the system, and the hydraulic oil delivered by the gear pump (3) enters the control valve block (6) through the first working oil port P;The second working oil port A is connected with the left cavity of the clutch cylinder (7);The third working oil port T is connected with the radiator (5) through the hydraulic pipeline, and the delivered hydraulic oil enters the radiator (5) for heat dissipation;The fourth working oil port T1 makes the check valve (12) communicate with the oil tank (1), and when the check valve (12) is opened, the hydraulic oil can flow into the oil tank (1) through the fourth working oil port T1;The fifth working oil port T2 is the oil return port of the clutch cylinder (7), and the fifth working oil port T2 makes the hydraulic oil of the clutch cylinder (7) flow back to the oil tank (1) when the clutch is separated to combined.

3. The electro-hydraulic control system of a double-acting clutch for an intelligent tractor according to claim 2, characterized in that, When the hydraulic system of the electro-hydraulic double-acting clutch is in non-working state, the double-acting clutch (8) is a normally closed clutch; the gear pump (3) is connected with the gear chamber of the engine; when the engine is running, the gear pump (3) starts to work, the cavity of the gear pump (3) forms negative pressure, the hydraulic oil is sucked out from the oil tank (1), passes through the oil suction filter (2) and enters the gear pump (3); with the continuous rotation of the gear pump (3), the hydraulic oil in the pump cavity is delivered to the high-pressure filter (4) and then to the control valve block (6) through re-filtering; at this time, the control valve block (6) is in non-working state, i.e. the electromagnetic valve (9) does not receive current, and the electromagnetic valve (9) does not perform any action; the oil delivered by the gear pump (3) enters the radiator (5) through the sequence valve (11), and then returns to the oil tank (1) after heat dissipation; when the radiator (5) fails and is blocked, the one-way valve (12) is opened, the hydraulic oil returns to the oil tank (1) through the one-way valve (12), which plays a protective role on the radiator (5) and avoids the explosion of the radiator (5) caused by excessive pressure.

4. The electro-hydraulic control system of a double-acting clutch for an intelligent tractor according to claim 3, characterized in that, When the hydraulic system of the electro-hydraulic double-acting clutch is in working state, the double-acting clutch (8) is in the combined state; the electromagnetic valve (9) is powered on by operating the button switch, the electromagnetic valve (9) moves to the right under the electromagnetic attraction, the left oil cavity of the valve core is connected with the oil inlet oil channel of the gear pump (3), and a passage is formed; under the action of the sequence valve (11), the oil inlet of the gear pump (3) is instantaneously pressurized to 1.6 MPa, the oil flows into the left cavity of the clutch cylinder (7) through the left cavity of the valve core of the electromagnetic valve (9), pushes the piston to move to the right, and realizes the separation of the clutch; at the same time, the excess oil continuously input by the gear pump (3) flows into the radiator (5) through the sequence valve (11), and then flows back to the oil tank (1) after heat dissipation; when the separation is completed and the combination is needed, the electromagnetic valve (9) loses current by operating the button switch; the electromagnetic valve (9) is disconnected, the valve core moves to the left, the oil cavity of the valve core is disconnected with the oil inlet oil channel of the gear pump (3), and the clutch cylinder (7) is communicated with the oil tank (1) through the right cavity of the valve core; the oil in the left cavity of the clutch cylinder (7) returns to the oil tank (1) through the electromagnetic valve (9) and then through the throttle valve (10) under the action of the return spring of the clutch, and the clutch is separated and combined.

5. The electro-hydraulic control system of a double-acting clutch for an intelligent tractor according to claim 4, characterized in that, The throttle valve (10) can adjust the flow rate of the oil, control the flow rate of the hydraulic oil by adjusting the throttle valve (10), and control the speed of the return of the clutch cylinder (7) and the combination time of the clutch.

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