CN104196803B - A kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter - Google Patents

Abstract

The invention belongs to the technical field of modern agricultural equipment and relates to a multifunctional threaded cartridge valve used for an electro-hydraulic lifter of a heavy tractor. The object of the present invention is to provide a multi-functional threaded cartridge valve for the electro-hydraulic lifter of a heavy tractor, which is suitable for the field operation environment, and has reliable operation and convenient operation and control. The invention improves the adaptability of the electro-hydraulic suspension hydraulic system, has the advantages of short design period, convenient installation and maintenance, less leakage, small vibration, reliable work, and is conducive to the integration and standardization of typical hydraulic systems; it adds on-site addition and Changing the flexibility of the circuit can replace the traditional hydraulic integrated block, which provides great convenience for the performance test of the electro-hydraulic lifter of heavy-duty tractors; the processing technology is simple, replacing the existing complex and expensive casting process, easy to disassemble and maintain, and in mass production, Low hardware cost.

Description

A Multifunctional Threaded Cartridge Valve Used in Heavy Duty Tractor Electro-hydraulic Lifter

technical field

The invention belongs to the technical field of modern agricultural equipment and relates to a multifunctional threaded cartridge valve used for an electro-hydraulic lifter of a heavy tractor.

Background technique

As a main part of the tractor suspension, the lifter has a direct impact on its lifting capacity and working performance on the working quality and working conditions of the tractor working unit. The hydraulic control valve is the power distribution unit of the lifter, and its performance directly restricts the working stability of the tractor lifter. Therefore, designing a hydraulic control valve with excellent performance is an essential link in the development of the lifter of the tractor electro-hydraulic suspension system.

At present, relevant scholars at home and abroad have studied the design of hydraulic control valves for tractor electro-hydraulic lifters. Most of the external structures are integral and split. The internal structure of the valve body is realized by casting and machining. The hydraulic valve has poor versatility. Casting and As long as there is a defect in one channel during the processing, the entire valve body will be scrapped.

In addition, the assembly precision of the valve core and valve body is high, which not only needs to meet the leakage requirements during the working process of the valve core, but also considers the jamming phenomenon caused by the deformation of the valve core, which greatly increases the design difficulty and processing of hydraulic valves. The cost and production cycle greatly limit its promotion and use.

Based on the idea of modularization, the present invention adopts a sliced structure, separates the main oil circuit and the feedback control oil circuit, and designs a multifunctional threaded cartridge valve for the electro-hydraulic lifter of the heavy-duty tractor.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a multi-functional threaded cartridge valve for heavy-duty tractor electro-hydraulic lifter suitable for field operation environment, which has reliable operation, simple processing technology and convenient operation and control.

In order to achieve the above object, the present invention provides the following technical solutions:

A multi-functional threaded cartridge valve for heavy-duty tractor electro-hydraulic lifter, which includes a lift control circuit and a multi-output control circuit,

Wherein, in the lifting control circuit, the first spherical shuttle valve 21 includes two oil inlets and one oil outlet, one of which is used as an external load feedback oil inlet LS _IN , and LS _OUT is used as an oil outlet It is used as a load feedback oil outlet, and the other oil inlet is not only connected with the pressure feedback port of the two-position three-way proportional reversing valve 9, but also connected with the spring end of the first differential pressure reducing valve 11 through a fixed damping hole. The pressure feedback port is connected. In addition, the pressure feedback port of the spring end of the _first differential pressure reducing valve 11 is connected with the oil return port T through another fixed damping hole; P and A1 are the oil inlet port and the load output port in turn, The pressure oil enters the oil inlet of the first differential pressure reducing valve 11 through the oil inlet P, and then enters the first differential pressure reducing valve through the oil outlet part of the first differential pressure reducing valve 11 through its internal feedback oil passage. The other part enters the oil inlet of the two-position three-way proportional reversing valve 9, and finally reaches the load output port A1 through the oil outlet of the two-position three-way proportional reversing valve ₉ ; the overflow The oil inlets of the valve 2 and the two-position two-way proportional directional control valve ₃ are connected to the load output port A1, and the oil outlets of the two are connected to the oil return port T;

In the multiple output control loop, the second spherical shuttle valve 22 and the third spherical shuttle valve 23 each include two oil inlets and one oil outlet, and one of the oil inlets of the second spherical shuttle valve 22 is used as an external The load feedback oil inlet LS _IN and LS _OUT are used as the oil outlet for the load feedback oil outlet, and the other oil inlet communicates with the oil outlet of the third spherical shuttle valve 23, and also communicates with the first oil outlet through a fixed damping hole. The pressure feedback port at the spring end of the second differential pressure reducing valve 12 communicates with each other, and the other two oil inlets of the third spherical shuttle valve 23 communicate with the primary load output ports A ₂₁ and B ₂₁ respectively; P and T are the oil inlets respectively and the oil return port, the pressure oil enters the oil inlet port of the second differential pressure reducing valve 12 through the oil inlet P, and then enters the second differential pressure reducing valve 12 through its internal feedback oil channel through the oil outlet part of the second differential pressure reducing valve 12 The other part of the pressure feedback port of the non-spring end of the differential pressure reducing valve 12 enters the oil inlet of the proportional hydraulic reversing valve 7, and finally reaches the primary load output port A ₂₁ and B ₂₁ ; the oil outlet of the proportional hydraulic reversing valve 7 communicates with the oil return port T, and the two hydraulic pilot reversing oil ports of the proportional hydraulic reversing valve 7 are respectively connected to the first proportional decompression and relief valve 1 and the second proportional The oil outlets of the pressure relief valve 4 are connected, and enter the respective pressure feedback ports with spring ends through the internal feedback oil channels of the first proportional pressure relief valve 1 and the second proportional pressure relief valve 4. The proportional decompression relief valve 1 and the oil inlet of the second proportional decompression relief valve 4 are connected correspondingly, and communicate with the oil inlet P; the first proportional decompression relief valve 1 and the second proportional decompression relief valve The oil return port of 4 is connected correspondingly, and communicates with the oil return port T, and enters the respective pressure feedback port of the non-spring end through its internal feedback oil passage;

A part of the oil circuit in the lifting control circuit is arranged in the front cover 6, and the other part is arranged in the lifting control circuit splint 5. A part of the oil circuit in the multi-output control circuit is arranged in the rear cover 10, and the other part is arranged in the rear cover 10. In the multi-output control circuit splint 8, the main body of the multi-function threaded cartridge valve is connected by four threaded rods, and the connection sequence is the front cover plate 6, the lifting control circuit splint 5, the multi-channel output control circuit splint 8 and the rear cover Plate 10; the oil inlet P and the oil return port T are vertically connected in the two circuit splints, and the positions are kept consistent. The load feedback output oil port LS _OUT and the external load feedback oil inlet LS _IN are vertically arranged respectively, and the external load feedback ports are respectively vertically arranged at the connection surface of the multi-output control circuit splint 8 and the rear cover 10 and the lifting control circuit splint 5. The oil inlet LS _IN and the load feedback output port LS _OUT , the external load feedback oil inlet LS _IN of the two-circuit splint and the load feedback output port LS _OUT are connected end to end, and finally output to the variable pump through the front cover plate 6;

Wherein the multiple output control loop splint 8 can be connected with the function switching module.

The function switching module is a balance valve block function module, wherein the primary load output ports A ₂₁ and B ₂₁ communicate with the oil inlets of the first balance valve 13 and the second balance valve 14 respectively, and in addition, the primary load output port A ₂₁ It communicates with the hydraulic pilot port inside the second balance valve 14, and the primary load output port B ₂₁ communicates with the hydraulic pilot port inside the first balance valve 13, and the oil outlets of the first balance valve 13 and the second balance valve 14 are respectively used as Final stage load output port A ₂₂ , B ₂₂ .

The function switching module is a safety valve block function module, wherein the primary load output ports A ₂₁ and B ₂₁ are respectively connected to the oil inlet ports of the first safety valve 15 and the second safety valve 16, and are respectively used as final-stage load output Ports A ₂₂ , B ₂₂ , the oil outlets of the first safety valve 15 and the second safety valve 16 communicate with the oil return port T.

The function switching module is a locking floating valve block functional module, wherein the oil inlet of the first hydraulic control check valve 18 and the first two-position two-way electromagnetic reversing valve 17 communicate with the primary load output port A ₂₁ , and the two The oil outlets of the latter are connected and used as the final load output port A ₂₂ , the oil inlet ports of the second hydraulic control check valve 19 and the second two-position two-way electromagnetic reversing valve 20 are connected with the primary load output port B ₂₁ , The oil outlets of the two are connected and used as the final load output port B ₂₂ . In addition, the hydraulic pilot port inside the first hydraulic control check valve 18 communicates with the primary load output port B ₂₁ , and the second hydraulic control check valve 19 The internal hydraulic pilot port communicates with the primary load output port A ₂₁ .

In the splint assembly of the lifting control circuit, the oil circuit in the lifting control circuit includes two parts: the internal oil circuit of the lifting control circuit splint and the internal oil circuit of the front cover 6, wherein the internal oil circuit of the lifting control circuit splint includes the oil inlet P successively passes through the oil inlet and outlet of the first differential pressure reducing valve 11 and the two-position three-way proportional reversing valve 9 to the oil circuit _of the load output oil port A1, the two-position two-way proportional reversing valve 3 and the The oil passage connecting the oil outlet of the relief valve 2 with the oil return port T and the oil passage of the pressure feedback port with spring end of the first constant differential pressure reducing valve 11 communicating with the oil return port T through a fixed damping hole; the front cover The internal oil circuit of the plate 6 includes the oil circuit in which the oil inlet port of the relief valve 2 and the two-position two-way proportional reversing valve ₃ communicates with the load output oil port A1, and the pressure feedback of the spring end of the first differential pressure reducing valve 11 The oil passage through another fixed damping hole communicates with the internal load feedback oil inlet of the first spherical shuttle valve 21 and the pressure feedback port of the two-position three-way proportional reversing valve 9;

Wherein, the oil inlet P and the oil return port T are vertically connected to the connecting surface of the lifting control circuit splint 5, and the load feedback oil outlet LS _OUT is vertically arranged on the connecting surface of the lifting control circuit splint 5 and the front cover plate 6. The output oil port A ₁ is arranged on the side of the splint, the two-position two-way proportional reversing valve 3 and the overflow valve 2 are arranged on the left side of the splint, the first differential pressure reducing valve 11 and the two-position three-way proportional reversing valve 9 Arranged on the right side of the splint, the first spherical shuttle valve 21 is loaded into the inside of the splint from the upper side.

In the splint assembly of the multi-output control circuit, the oil circuit in the multi-output control circuit includes two parts: the internal oil circuit of the multi-output control circuit splint and the internal oil circuit of the rear cover 10, wherein the multiple output control circuit splint The internal oil circuit includes the oil circuit from the oil inlet P to the primary load output ports A ₂₁ and B ₂₁ through the oil inlet and outlet of the second differential pressure reducing valve 12 and the proportional hydraulic reversing valve 7 in sequence, the proportional fluid The hydraulic pilot reversing oil ports of the dynamic reversing valve 7 are respectively connected with the oil outlets of the first proportional decompression relief valve 1 and the second proportional decompression relief valve 4, and the oil inlet of the second spherical shuttle valve 22 is passed through The oil passage between the fixed damping hole and the pressure feedback port at the spring end of the second differential pressure reducing valve 12 and the oil passage between the oil inlet of the second spherical shuttle valve 22 and the oil outlet of the third spherical shuttle valve 23; the back cover The internal oil circuit of the plate 10 includes the oil circuit in which the oil return port of the proportional hydraulic reversing valve 7 communicates with the oil return port T, the oil inlet and return port of the first proportional pressure relief valve 1 and the second proportional pressure relief valve 4 The oil passages in which the oil ports communicate with the oil inlet P and the oil return port T in turn, and the oil passages in which the primary load output ports A ₂₁ and B ₂₁ communicate with the two oil inlets of the third spherical shuttle valve 23 respectively;

Among them, the oil inlet P and the oil return port T are vertically connected to the connection surface of the multi-output control circuit splint 8, and the load feedback oil outlet LS _OUT is vertically arranged on the multi-output control circuit splint 8 and the lifting control circuit splint 5 The connecting surface of the primary load output port A ₂₁ , B ₂₁ and the first proportional pressure relief valve 1 and the second proportional pressure relief valve 4 are arranged on the left side of the splint, and the proportional hydraulic reversing valve 7 is arranged on the splint On the side, the second fixed differential pressure reducing valve 12 is arranged on the right side of the splint, and the second spherical shuttle valve 22 and the third spherical shuttle valve 23 are installed into the inside of the splint from the upper side and the right side respectively.

The designed maximum working pressure of the lifting control circuit is 25Mpa, and the rated flow rate is 80L/Min.

The maximum working pressure designed for the multi-output control loop is 25Mpa, and the rated flow rate is 80L/Min.

Compared with prior art, the beneficial effect of the present invention is:

The invention improves the adaptability of the electro-hydraulic suspension hydraulic system, has the advantages of short design period, convenient installation and maintenance, less leakage, small vibration, reliable work, and is conducive to the integration and standardization of typical hydraulic systems; it adds on-site addition and Changing the flexibility of the circuit can replace the traditional hydraulic integrated block, which provides great convenience for the performance test of the electro-hydraulic lifter of heavy tractors; the processing technology is simple, replacing the existing complex and expensive casting process, and the disassembly and maintenance are easy. low cost.

Description of drawings

Figure 1a is a schematic diagram of the lifting control loop;

Figure 1b is a schematic diagram of the multi-output control loop;

Figure 2a is a schematic diagram of a multi-output control loop with a balanced valve block function module;

Figure 2b is a schematic diagram of a multi-output control loop with a safety valve block function module;

Figure 2c is a schematic diagram of a multi-output control circuit with a locking floating valve block functional module;

Fig. 3 is a schematic diagram of the main body of the multifunctional threaded cartridge valve;

Figure 4 is an assembly drawing of the lifting control circuit splint;

Figure 5 is an assembly drawing of the multi-output control circuit splint;

Figure 6 is a schematic diagram of the appearance of the front cover;

Figure 7 is a schematic diagram of the appearance of the rear cover;

Fig. 8 is a schematic diagram of the balance valve block in the function switching module;

Fig. 9 is a schematic diagram of the safety valve block in the function switching module;

Fig. 10 is a schematic diagram of the locking floating valve block in the function switching module.

[Description of main component symbols]

1 first proportional pressure relief valve

2 relief valve

3 two-position two-way proportional directional control valve

4 second proportional pressure relief valve

5 lifting control circuit splint

6 front cover

7 proportional hydraulic directional valve

8 multi-output control loop splint

9 two-position three-way proportional directional control valve

10 rear cover

11 The first differential pressure reducing valve

12 Second differential pressure reducing valve

13 first balance valve

14 second balance valve

15 first safety valve

16 Second safety valve

17 The first two two-way electromagnetic reversing valve

18 The first hydraulic control check valve

19 The second hydraulic control check valve

20 The second two-position two-way electromagnetic reversing valve

21 first spherical shuttle valve

22 Second ball shuttle valve

23 third spherical shuttle valve

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The multifunctional threaded cartridge valve for heavy tractor electro-hydraulic lifter of the present invention is suitable for load feedback hydraulic systems with variable pumps, and can be used for different work load control, such as single-acting hydraulic cylinders, double-acting hydraulic cylinders and hydraulic motors .

As shown in Figure 3, it is a schematic diagram of the main body of the multifunctional threaded cartridge valve of the present invention. The multifunctional threaded cartridge valve includes a lifting control circuit and a multi-channel output control circuit. For different load working occasions, the present invention also adds function switching module.

Wherein, as shown in Fig. 1a, it is a schematic diagram of the lifting control circuit, which is used for the lifting control of the single-acting hydraulic cylinder of the tractor lifting arm, the designed maximum working pressure is 25Mpa, and the rated flow rate is 80L/Min.

Wherein, the first spherical shuttle valve 21 includes two oil inlets and one oil outlet, one of which is used as an external load feedback oil inlet LS _IN , and the oil outlet LS _OUT is used as a load feedback oil outlet, and the other In addition to communicating with the pressure feedback port of the two-position three-way proportional reversing valve 9, one oil inlet also communicates with the pressure feedback port of the spring end of the first differential pressure reducing valve 11 through a fixed damping hole, which relieves the pressure of the two positions. The impact of the pressure at the feedback port of the three-way proportional reversing valve 9 on the spool of the first differential pressure reducing valve 11 . In addition, the pressure feedback port at the spring end of the first differential pressure reducing valve 11 communicates with the oil return port T through another fixed damping hole to prevent the pressure feedback port at the spring end of the first differential pressure reducing valve 11 from block. P, A ₁ are the oil inlet and the load output port in turn, the pressure oil enters the oil inlet of the first differential pressure reducing valve 11 through the oil inlet P, and then passes through the oil outlet of the first differential pressure reducing valve 11 , part of it enters the pressure feedback port of the spring-free end of the first differential pressure reducing valve 11 through a fixed damping hole through its internal feedback oil passage, and the other part enters the oil inlet port of the two-position three-way proportional reversing valve 9, and finally passes through the two The oil outlet of the three-way proportional reversing valve 9 reaches the load output port A ₁ . The oil inlet of the overflow valve 2 and the two-position two-way proportional reversing valve 3 are connected to the load output port A ₁ , and the oil outlets of the two are connected to the oil return port T. The opening pressure of the relief valve 2 is 20Mpa , closed in normal state, connected to load output port A ₁ and oil return port T in case of overload, with safety protection function. When the two-position two-way proportional directional control valve 3 and the two-position three-way proportional directional control valve 9 are powered off, the internal one-way valve is locked to prevent the backflow of oil. The first differential pressure reducing valve 11 maintains the pressure difference between the oil supply pressure and the load pressure within the range of 1.1Mpa, and the pressure at the feedback port of the two-position three-way proportional reversing valve 9 is connected to the external pressure through the first spherical shuttle valve 21. The load pressure is compared, and the higher pressure is fed back to the variable pump through the load feedback oil port LS _OUT , so that the working pressure of the variable pump changes with the change of the maximum load pressure. It has a load sensing function and reduces the power consumption of the system.

As shown in Figure 4, it is the splint assembly drawing of the lifting control circuit, wherein the oil inlet P and the oil return port T are vertically connected to the connection surface of the lifting control circuit splint 5, and the load feedback oil outlet LS _OUT is vertical Arranged on the connection surface between the lifting control circuit splint 5 and the front cover 6, the load output oil port A ₁ is arranged on the side of the splint, the two-position two-way proportional reversing valve 3 and the overflow valve 2 are arranged on the left side of the splint, the second A certain difference pressure reducing valve 11 and a two-position three-way proportional reversing valve 9 are arranged on the right side of the splint, and the first spherical shuttle valve 21 is loaded into the inside of the splint from the upper side.

The oil circuit in the lifting control circuit includes two parts: the internal oil circuit of the lifting control circuit splint and the internal oil circuit of the front cover 6, wherein the internal oil circuit of the lifting control circuit splint includes the oil inlet P through the first differential pressure reducing valve 11 in sequence and the oil inlet and outlet of the two-position three-way proportional reversing valve 9 reach the oil circuit of the load output oil port A ₁ , the oil outlet and the oil return of the two-position two-way proportional reversing valve 3 and the relief valve 2 The oil circuit communicated with the port T and the oil circuit communicated with the oil return port T by the spring end pressure feedback port of the first differential pressure reducing valve 11 through a fixed damping hole; the internal oil circuit of the front cover 6 includes the overflow valve 2 and The oil passage where the oil inlet port of the two-position two-way proportional reversing valve ₃ communicates with the load output oil port A1, and the pressure feedback port at the spring end of the first differential pressure reducing valve 11 is respectively connected to the first differential pressure reducing valve 11 through another fixed damping hole. The internal load feedback oil inlet of the spherical shuttle valve 21 communicates with the oil passage of the pressure feedback port of the two-position three-way proportional reversing valve 9 .

As shown in Figure 1b, it is a schematic diagram of a multi-output control circuit, which is used for hydraulic multi-output control of the hydraulic source, with a designed maximum working pressure of 25Mpa and a rated flow rate of 80L/Min.

Wherein, the second spherical shuttle valve 22 and the third spherical shuttle valve 23 each include two oil inlets and one oil outlet, and one of the oil inlets of the second spherical shuttle valve 22 is used as an external load feedback oil inlet LS _IN , the oil outlet LS _OUT is used as the load feedback oil outlet, and the other oil inlet is not only communicated with the oil outlet of the third spherical shuttle valve 23, but also connected with the second differential pressure reducing valve 12 through a fixed damping hole. The pressure feedback port at the spring end is connected to relieve the impact of the load feedback pressure on the spool of the second differential pressure reducing valve 12 . The remaining two oil inlets of the third spherical shuttle valve 23 communicate with the primary load output ports A ₂₁ and B ₂₁ respectively. P and T are the oil inlet and the oil return port respectively. The pressure oil enters the oil inlet of the second differential pressure reducing valve 12 through the oil inlet P, and then passes through a part of the oil outlet of the second differential pressure reducing valve 12. One fixed damping hole enters the pressure feedback port of the second differential pressure reducing valve 12 through its internal feedback oil passage, and the other part enters the oil inlet port of the proportional hydraulic reversing valve 7, and finally passes through the proportional hydraulic reversing valve 7. The reversing outlets go to the primary load outlets A ₂₁ and B ₂₁ . The oil outlet of the proportional hydraulic reversing valve 7 communicates with the oil return port T, and the two hydraulic pilot reversing oil ports of the proportional hydraulic reversing valve 7 are respectively connected with the first proportional decompression and relief valve 1 and the second proportional decompression and relief valve. The oil outlets of flow valve 4 communicate with each other, and pass through the internal feedback oil passages of the first proportional pressure relief valve 1 and the second proportional pressure relief valve 4 into the respective spring end pressure feedback ports. The oil inlets of the first proportional decompression and relief valve 1 and the second proportional decompression and relief valve 4 are correspondingly connected, and communicate with the oil inlet P; the first proportional decompression and relief valve 1 and the second proportional decompression and relief valve The oil return port of the flow valve 4 is connected correspondingly, communicates with the oil return port T, and enters the respective pressure feedback port of the non-spring end through its internal feedback oil passage. The second fixed difference pressure reducing valve 12 maintains the pressure difference between the oil supply pressure and the load pressure within the range of 1.1Mpa to realize the load pressure compensation function. The proportional hydraulic reversing valve 7, the first proportional pressure relief valve 1 and The second proportional pressure relief valve 4 jointly realizes the load reversing function, and the third spherical shuttle valve 23 is used to compare the pressures of the primary load output ports A ₂₁ and B ₂₁ , and use the higher pressure as the pressure of the second spherical shuttle valve 22 The internal load feedback input is compared with the pressure of the external load feedback input, and finally the highest load pressure is fed back to the variable pump to realize the load sensing function and reduce the power consumption of the system.

As shown in Figure 5, it is an assembly drawing of the splint of the multi-output control circuit, wherein the oil inlet P and the oil return port T are vertically connected to the connection surface of the splint 8 of the multi-output control circuit, and the oil is fed back from the load The port LS _OUT is vertically arranged on the connecting surface of the multi-output control circuit splint 8 and the lift control circuit splint 5, the primary load output ports A ₂₁ , B ₂₁ and the first proportional pressure relief valve 1 and the second proportional pressure relief valve 1 The valve 4 is arranged on the left side of the splint, the proportional hydraulic reversing valve 7 is arranged on the side of the splint, the second differential pressure reducing valve 12 is arranged on the right side of the splint, the second spherical shuttle valve 22 and the third spherical shuttle valve 23 are respectively Fit inside the splint from the top and right sides.

The oil circuit in the multi-output control circuit includes two parts: the internal oil circuit of the multi-output control circuit splint and the internal oil circuit of the rear cover 10, wherein the internal oil circuit of the multi-output control circuit splint includes the oil inlet P through the second The oil inlet and outlet of the differential pressure reducing valve 12 and the proportional hydraulic reversing valve 7 reach the oil circuit of the primary load output port A ₂₁ and B ₂₁ , and the hydraulic pilot reversing oil port of the proportional hydraulic reversing valve 7 is respectively connected with The oil passage connected to the oil outlet of the first proportional decompression and relief valve 1 and the second proportional decompression and relief valve 4, the oil inlet of the second spherical shuttle valve 22 and the second differential pressure relief valve 12 through the fixed damping hole There is an oil circuit connected to the pressure feedback port of the spring end and an oil circuit connected to the oil inlet of the second spherical shuttle valve 22 and the oil outlet of the third spherical shuttle valve 23; the internal oil circuit of the rear cover 10 includes a proportional hydraulic reversing valve 7 The oil passage connecting the oil return port to the oil return port T, the oil passage connected to the oil inlet of the first proportional decompression relief valve 1 and the second proportional decompression relief valve 4 and communicating with the oil inlet P, the first The proportional decompression relief valve 1 is connected to the oil return port of the second proportional decompression relief valve 4 and communicated with the oil return port T, and the primary load output ports A ₂₁ and B ₂₁ are respectively connected to the third spherical shuttle valve The oil passage that two oil inlets of 23 communicate.

A part of the oil circuit in the lifting control circuit is arranged in the front cover 6, and the other part is arranged in the lifting control circuit splint 5. A part of the oil circuit in the multi-output control circuit is arranged in the rear cover 10, and the other part is arranged in the rear cover 10. In the multi-output control circuit splint 8, the main body of the multi-function threaded cartridge valve is connected by four threaded rods, and the connection sequence is the front cover plate 6, the lifting control circuit splint 5, the multi-channel output control circuit splint 8 and the rear cover plate 10. The oil inlet P and the oil return port T are vertically connected in the two circuit splints, and the positions are kept consistent. They are vertically arranged at the connection surfaces of the lifting control circuit splint 5, the front cover plate 6 and the multi-output control circuit splint 8 respectively. The load feedback output oil port LS _OUT and the external load feedback oil inlet port LS _IN are respectively vertically arranged on the joint surface of the multi-output control circuit splint 8, the rear cover plate 10 and the lifting control circuit splint 5. LS _IN and load feedback output oil port LS _OUT , the external load feedback oil inlet LS _IN of the two-circuit splint and load feedback output oil port LS _OUT are connected end to end, and finally output to the variable pump through the front cover plate 6 to realize the load sensing function.

The multi-output control loop splint 8 can be connected with the function switching module to realize the control of different workloads.

As shown in Figure 2a, it is a schematic diagram of a multi-output control circuit with a balance valve block functional module, wherein the primary load output ports A ₂₁ and B ₂₁ communicate with the oil inlets of the first balance valve 13 and the second balance valve 14 respectively , In addition, the primary load output port A ₂₁ communicates with the hydraulic pilot port inside the second balance valve 14, the primary load output port B ₂₁ communicates with the hydraulic pilot port inside the first balance valve 13, the first balance valve 13 and the second balance valve The oil outlets of the valve 14 are respectively used as final stage load output ports A ₂₂ , B ₂₂ . Figure 8 is a schematic diagram of the balance valve block in the function switching module. The first balance valve 13 and the second balance valve 14 are arranged on the upper side of the valve block, and the primary load output ports A ₂₁ and B ₂₁ on the splint 8 of the multi-output control circuit pass through The two oil inlets directly behind the balance valve block are respectively connected to the oil inlets of the first balance valve 13 and the second balance valve 14, and the final load output ports A ₂₂ and B ₂₂ are arranged in front of the balance valve block.

As shown in Figure 2b, it is a schematic diagram of a multi-output control circuit with a safety valve block functional module, wherein the primary load output ports A ₂₁ and B ₂₁ communicate with the oil inlets of the first safety valve 15 and the second safety valve 16 respectively Afterwards, they are respectively used as final load output ports A ₂₂ and B ₂₂ , and the oil outlets of the first safety valve 15 and the second safety valve 16 communicate with the oil return port T; Figure 9 is a schematic diagram of the safety valve block in the function switching module , the first safety valve 15 and the second safety valve 16 are arranged on the upper side of the valve block, and the primary load output ports A ₂₁ and B ₂₁ on the multi-output control circuit splint 8 pass through the two oil inlets directly behind the safety valve block respectively It is connected to the oil inlet of the first safety valve 15 and the second safety valve 16, and the oil return port T on the right side of the safety valve block is connected to the oil return port T on the upper side of the front cover plate 6, and the final load outputs oil Ports A ₂₂ and B ₂₂ are arranged in front of the valve block.

As shown in Figure 2c, it is a schematic diagram of a multi-output control circuit with a locking floating valve block functional module, wherein the oil inlet of the first hydraulic control check valve 18 and the first two-position two-way electromagnetic reversing valve 17 are connected to the The primary load output port A ₂₁ is connected, and the oil outlets of the two are connected to be used as the final load output port A ₂₂ , the oil inlet port of the second hydraulic control check valve 19 and the second two-position two-way electromagnetic reversing valve 20 It communicates with the primary load output port B ₂₁ , and the oil outlets of the two are connected and used as the final load output port B _22. In addition, the hydraulic pilot port inside the first hydraulic control check valve 18 communicates with the primary load output port B ₂₁ , the hydraulic pilot port inside the second hydraulic control check valve 19 communicates with the primary load output port A ₂₁ ; FIG. The control check valve 19 is arranged on the right side of the valve block. The primary load output ports A ₂₁ and B ₂₁ on the multi-output control circuit splint 8 are respectively connected to the first liquid by locking the two oil inlets directly in front of the floating valve block. The oil inlet ports of the control check valve 18 and the second hydraulic control check valve 19 are connected, and the first two-position two-way electromagnetic reversing valve 17 and the second two-position two-way electromagnetic reversing valve 20 are respectively arranged on the valve block On the side and the lower side, the final load output ports A ₂₂ and B ₂₂ are arranged on the left side of the valve block.

When the multi-functional threaded cartridge valve used for heavy-duty tractor electro-hydraulic lifter of the present invention is working, wherein:

In the lifting control circuit, before working, the two-position two-way proportional reversing valve 3 and the two-position three-way proportional reversing valve 9 are in a power-off state. When the two-position three-way proportional reversing valve 9 is energized, its right position works, and the pressure oil output by the variable pump is decompressed by the first differential pressure reducing valve 11 and then enters the two-position three-way proportional reversing valve 9, part of which It is used to feed back the load pressure, and reaches the pressure feedback port of the first differential pressure reducing valve 11 through the fixed damping hole. At the same time, the load pressure in the system is compared with the load pressure of the external system circuit through the first spherical shuttle valve 21, and the The maximum load pressure is fed back to the variable pump to make its output pressure change with the change of load pressure; the other part is used for load output through A ₁ port. At this time, the hydraulic cylinder of the lifting arm is extended to lift the suspended farm implements, and the lifting speed is not changed by the load pressure. The influence is only related to the opening degree of the two-position three-way proportional reversing valve 9. After the two-position three-way proportional reversing valve 9 is powered off, the suspended farm implements are locked, and the oil flows from P to A1 _; when the two-position two-way proportional reversing valve 3 is powered on, its left position works, and the oil is output through the load Port A ₁ and two-position two-way proportional reversing valve 3 are returned to the fuel tank. At this time, the hydraulic cylinder of the lifting arm retracts, and the hanging agricultural implements descend. The descending speed can be adjusted by changing the opening of the two-position two-way proportional reversing valve 3. , the oil flow direction is from A ₁ to T.

In the multi-output control circuit, before work, the first proportional pressure relief valve 1 and the second proportional pressure relief valve 4 are in the power-off state, the proportional hydraulic reversing valve 7 is in the neutral position, and the primary load output port A _21. B ₂₁ is connected to the oil return port T. When the first proportional decompression and relief valve 1 is energized, its left position works, and the pressure oil output by the variable pump enters the first proportional decompression and relief valve 1, and then reaches the proportional pressure relief valve 1. The hydraulic pilot port of hydraulic reversing valve 7 makes its left position work, the oil flows back to the oil tank after passing through the function switching area and the external load, and the oil flow direction is from P to A ₂₁ and from B ₂₁ to T; similarly, when the first When the two-proportional decompression and overflow valve 4 is energized, its right position works, and the working process is the same as above, and the oil flow direction is from P to B ₂₁ and from A ₂₁ to T. The load pressure in the system reaches the pressure feedback port of the second differential pressure reducing valve 12 through the third spherical shuttle valve 23 through the fixed damping hole. At the same time, the load pressure in the system is exchanged with the external system load pressure through the second spherical shuttle valve 22. In comparison, the maximum load pressure is fed back to the variable pump so that the output pressure changes with the change of the load pressure, and the load output flow is only related to the valve opening of the proportional hydraulic reversing valve 7, and is not affected by the change of the load pressure.

In the function switching area, when the primary load output ports A ₂₁ and B ₂₁ are respectively connected with the oil inlet ports of the first balance valve 13 and the second balance valve 14, if the hydraulic control reversing valve 7 works in the left position, the first balance The one-way valve in the valve 13 is opened, the output port A ₂₂ of the final stage load outputs oil, and at the same time, the load pressure oil passes through the hydraulic pilot port inside the second balance valve 14 to open the relief valve in the second balance valve 14, and the output of the final stage load Port B ₂₂ oil return, and vice versa, can be used for hydraulic motor and double-acting hydraulic cylinder control, with braking and overload protection functions; when the primary load output ports A ₂₁ and B ₂₁ are respectively connected to the first safety valve 15 and the second When the oil inlet port of the safety valve 16 can be used as the output port A ₂₂ and B ₂₂ of the final stage load, the oil outlet ports of the first safety valve 15 and the second safety valve 16 are connected to the oil return port T. When the final stage load output When the pressure of ports A ₂₂ and B ₂₂ is too high, the first safety valve 15 and the second safety valve 16 are opened, and the high-pressure oil overflows back to the oil tank, which can be used for non-static load hydraulic cylinder control and has overload protection function; when the primary load output port A ₂₁ and B ₂₁ are respectively connected to the oil inlet of the first hydraulic control check valve 18 and the first two-position two-way electromagnetic reversing valve 17, and the second hydraulic control check valve 19 is connected to the second two-position two-way electromagnetic reversing valve. When the oil inlet port of the valve 20 is connected, when the first two-position two-way electromagnetic selector valve 17 and the second two-position two-way electromagnetic selector valve 20 are de-energized, the output ports A ₂₂ and B ₂₂ of the final load are locked. If the hydraulic control reversing valve 7 works in the right position, the second hydraulic control check valve 19 will open, the final load output oil port B ₂₂ will enter the oil, and the load pressure oil will pass through the first hydraulic control unit. Open the first hydraulic control check valve 18 to the hydraulic pilot port inside the valve 18, and the final load output port A ₂₂ returns oil, and vice versa, it can be used for double-acting cylinder control, with locking and floating functions.

Claims (8)

1., for a multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter, it is characterized in that:

It comprises lifting control loop and multiple-channel output control loop,

Wherein, in described lifting control loop, the first spherical shuttle valve (21) comprises two filler openings and an oil outlet, and one of them filler opening is used as external loading feedback filler opening LS _iN, LS _oUTload feedback oil outlet is used as oil outlet, another filler opening is except communicating with the pressure feedback mouth of two-bit triplet proportional reversing valve (9), also communicated with the spring terminal pressure feedback mouth that has of the first Fixed differential reducing valve (11) by a fixing damping hole, in addition, the first Fixed differential reducing valve (11) has spring terminal pressure feedback mouth to fix damping hole by another one to communicate with oil return inlet T; P, A ₁be followed successively by filler opening and load output oil port, pressure oil enters the filler opening of the first Fixed differential reducing valve (11) through oil inlet P, with after through the first Fixed differential reducing valve (11) oil outlet a part by its internal feedback oil duct enter the first Fixed differential reducing valve (11) without spring terminal pressure feedback mouth, another part enters the filler opening of two-bit triplet proportional reversing valve (9), and the oil outlet eventually through two-bit triplet proportional reversing valve (9) arrives load delivery outlet A ₁; Relief valve (2) and 2/2-way proportional reversing valve (3) both filler openings and load output oil port A ₁communicate, both oil outlets communicate with oil return inlet T;

In described multiple-channel output control loop, second spherical shuttle valve (22) and the 3rd spherical shuttle valve (23) respectively comprise two filler openings and an oil outlet, and a filler opening in the second spherical shuttle valve (22) is used as external loading feedback filler opening LS _iN, LS _oUTload feedback oil outlet is used as oil outlet, another filler opening is except communicating with the oil outlet of the 3rd spherical shuttle valve (23), also communicated with the spring terminal pressure feedback mouth that has of the second Fixed differential reducing valve (12) by a fixing damping hole, all the other two filler openings of the 3rd spherical shuttle valve (23) respectively with primary load delivery outlet A ₂₁and B ₂₁communicate; P and T is respectively filler opening and return opening, pressure oil enters the filler opening of the second Fixed differential reducing valve (12) through oil inlet P, with after through the second Fixed differential reducing valve (12) oil outlet a part by its internal feedback oil duct enter the second Fixed differential reducing valve (12) without spring terminal pressure feedback mouth, another part enters the filler opening of ratio hydraulicchange-over valve (7), and the commutation oil outlet eventually through ratio hydraulicchange-over valve (7) arrives primary load delivery outlet A ₂₁and B ₂₁; The oil outlet of ratio hydraulicchange-over valve (7) communicates with oil return inlet T, the reduce pressure oil outlet of relief valve (4) of two hydraulic pilots commutation hydraulic fluid ports of ratio hydraulicchange-over valve (7) reduce pressure respectively with the first ratio relief valve (1) and the second ratio communicates, and enter respective have spring terminal pressure feedback mouth by the reduce pressure internal feedback oil duct of relief valve (4) of the first ratio decompression relief valve (1) and the second ratio, first ratio decompression relief valve (1) is connected with the filler opening correspondence of the second ratio decompression relief valve (4), and communicates with oil inlet P; The return opening of the first ratio decompression relief valve (1) and the second ratio decompression relief valve (4) is corresponding to be connected, and communicates with oil return inlet T, is entered respective without spring terminal pressure feedback mouth by its internal feedback oil duct;

An oil circuit part in described lifting control loop is arranged in front shroud (6), another part is arranged in and promotes in control loop clamping plate (5), an oil circuit part in multiple-channel output control loop is arranged in back shroud (10), another part is arranged in multiple-channel output control loop clamping plate (8), the main body of multi-functional screw-in cartridge valve is connected by four threaded stems, and the order of connection is followed successively by front shroud (6), promotes control loop clamping plate (5), multiple-channel output control loop clamping plate (8) and back shroud (10); Oil inlet P and oil return inlet T are vertical through in two kinds of loop clamping plate, position is consistent, promoting the junction surface place of control loop clamping plate (5) and front shroud (6) and multiple-channel output control loop clamping plate (8), be arranged vertically load feedback output oil port LS respectively _oUTwith external loading feedback filler opening LS _iN, at multiple-channel output control loop clamping plate (8) and back shroud (10) and the junction surface place promoting control loop clamping plate (5), be arranged vertically external loading feedback filler opening LS respectively _iNwith load feedback output oil port LS _oUT, the external loading feedback filler opening LS of two loop clamping plate _iNwith load feedback output oil port LS _oUTjoin end to end, output to variable displacement pump eventually through front shroud (6);

Wherein multiple-channel output control loop clamping plate (8) are connected with function handover module.

2. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as claimed in claim 1, is characterized in that:

Described function handover module is balance valve block function module, wherein, and primary load delivery outlet A ₂₁, B ₂₁communicate with the filler opening of the first equilibrium valve (13) and the second equilibrium valve (14) respectively, in addition, primary load delivery outlet A ₂₁the hydraulic pilot mouth inner with the second equilibrium valve (14) communicates, primary load delivery outlet B ₂₁the hydraulic pilot mouth inner with the first equilibrium valve (13) communicates, and the oil outlet of the first equilibrium valve (13) and the second equilibrium valve (14) is used separately as final stage load delivery outlet A ₂₂, B ₂₂.

3. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as claimed in claim 1, is characterized in that:

Described function handover module is safety valve block function module, wherein, and primary load delivery outlet A ₂₁, B ₂₁after communicating with the filler opening of the first safety valve (15) and the second safety valve (16) respectively, be used separately as final stage load delivery outlet A ₂₂, B ₂₂, the oil outlet of the first safety valve (15) and the second safety valve (16) communicates with oil return inlet T.

4. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as claimed in claim 1, is characterized in that:

Described function handover module is locking floating valve block function module, wherein, and the filler opening of the first Pilot operated check valve (18) and the first 2/2-way solenoid directional control valve (17) and primary load delivery outlet A ₂₁communicate, after both oil outlet communicates, be used as final stage load delivery outlet A ₂₂, the filler opening of the second Pilot operated check valve (19) and the second 2/2-way solenoid directional control valve (20) and primary load delivery outlet B ₂₁communicate, after both oil outlet communicates, be used as final stage load delivery outlet B ₂₂, in addition, the hydraulic pilot mouth that the first Pilot operated check valve (18) is inner and primary load delivery outlet B ₂₁communicate, the hydraulic pilot mouth that the second Pilot operated check valve (19) is inner and primary load delivery outlet A ₂₁communicate.

5. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as described in one of claim 1-4, is characterized in that:

In the clamping plate assembling of described lifting control loop, the oil circuit promoted in control loop comprises and promotes control loop clamping plate internal oil passages and front shroud (6) internal oil passages two-part, wherein promotes control loop clamping plate internal oil passages and comprises by oil inlet P successively through filler opening and the oil outlet arrival load output oil port A of the first Fixed differential reducing valve (11) and two-bit triplet proportional reversing valve (9) ₁oil circuit, oil circuit that 2/2-way proportional reversing valve (3) and the oil outlet of relief valve (2) are communicated with oil return inlet T and the first Fixed differential reducing valve (11) the oil circuit having spring terminal pressure feedback mouth to be communicated with oil return inlet T through a fixing damping hole; Front shroud (6) internal oil passages comprises filler opening and the load output oil port A of relief valve (2) and 2/2-way proportional reversing valve (3) ₁the oil circuit be communicated with and the first Fixed differential reducing valve (11) have spring terminal pressure feedback mouth through another fixing damping hole respectively shuttle valve (21) internal load spherical with first feed back the oil circuit that filler opening is communicated with two-bit triplet proportional reversing valve (9) pressure feedback mouth;

Wherein, described oil inlet P is vertical with oil return inlet T runs through the junction surface promoting control loop clamping plate (5), load feedback oil outlet LS _oUTbe arranged vertically within the junction surface promoting control loop clamping plate (5) and front shroud (6), load output oil port A ₁be arranged in clamping plate upper side, 2/2-way proportional reversing valve (3) and relief valve (2) are arranged in clamping plate left surface, first Fixed differential reducing valve (11) and two-bit triplet proportional reversing valve (9) are arranged in clamping plate right flank, and it is inner that the first spherical shuttle valve (21) loads clamping plate from upper side.

6. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as described in one of claim 1-4, is characterized in that:

In the clamping plate assembling of described multiple-channel output control loop, oil circuit in multiple-channel output control loop comprises multiple-channel output control loop clamping plate internal oil passages and back shroud (10) internal oil passages two-part, and wherein multiple-channel output control loop clamping plate internal oil passages comprises and arrives primary load delivery outlet A through the filler opening of the second Fixed differential reducing valve (12) and ratio hydraulicchange-over valve (7) and oil outlet successively by oil inlet P ₂₁and B ₂₁reduce pressure with the first ratio respectively oil circuit that relief valve (1) is communicated with the oil outlet that the second ratio reduces pressure relief valve (4), the second spherical shuttle valve (22) filler opening warp of oil circuit, ratio hydraulicchange-over valve (7) hydraulic pilot commutation hydraulic fluid port fix the oil circuit that damping hole is communicated with the 3rd spherical shuttle valve (23) oil outlet with the oil circuit having spring terminal pressure feedback mouth to be communicated with and second spherical shuttle valve (22) filler opening of the second Fixed differential reducing valve (12); The oil circuit that filler opening and return opening that back shroud (10) internal oil passages comprises oil circuit that ratio hydraulicchange-over valve (7) return opening is communicated with oil return inlet T, the first ratio reduces pressure relief valve (1) and the second ratio reduce pressure relief valve (4) are communicated with oil return inlet T with oil inlet P successively and primary load delivery outlet A ₂₁, B ₂₁the oil circuit be communicated with two filler openings of the 3rd spherical shuttle valve (23) respectively;

Wherein, the described oil inlet P junction surface that run through multiple-channel output control loop clamping plate (8) vertical with oil return inlet T, load feedback oil outlet LS _oUTbe arranged vertically within multiple-channel output control loop clamping plate (8) and the junction surface promoting control loop clamping plate (5), primary load delivery outlet A ₂₁, B ₂₁and first ratio decompression relief valve (1) and the second ratio reduce pressure relief valve (4) be arranged in clamping plate left surface, ratio hydraulicchange-over valve (7) is arranged in clamping plate upper side, second Fixed differential reducing valve (12) is arranged in clamping plate right flank, and it is inner that the second spherical shuttle valve (22) and the 3rd spherical shuttle valve (23) load clamping plate from upper side and right flank respectively.

7. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as described in one of claim 1-4, is characterized in that:

The Maximum operating pressure of described lifting control loop design is 25Mpa, and rated flow is 80L/Min.

8. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as described in one of claim 1-4, is characterized in that:

The Maximum operating pressure of described multiple-channel output control loop design is 25Mpa, and rated flow is 80L/Min.