Tractor multi-way valve with hydraulic lock

Abstract

The tractor multi-way valve with the hydraulic lock comprises a first reversing valve and a second reversing valve, the first reversing valve is a four-position seven-way reversing valve, and the four-position seven-way reversing valve comprises a first inlet, a second inlet, a third inlet, a fourth inlet, a first outlet, a second outlet and a third outlet. The first inlet is connected with the oil return tank through a first oil way, the second inlet is connected with a hydraulic source through a second oil way, the third inlet is connected with the hydraulic source through a third oil way, the fourth inlet is normally closed, a one-way valve is arranged on the third oil way, the first outlet is connected with a working hydraulic element through a fourth oil way, and the second outlet is connected with the oil return tank through a fifth oil way. And the third outlet is connected with the working hydraulic element through a sixth oil way.

Description

Technical Field

[0001] The utility model relates to a multi-way valve for a tractor with a hydraulic lock. Background Art

[0002] At present, the multi-way valves on the market are equipped with a set of hydraulic locks or without hydraulic locks (by reducing the clearance between the valve stem and the valve body to reduce the internal leakage), or the internal leakage is not controlled. This will cause the agricultural implements to be unable to hold or have a short holding time when used by users, which is very dangerous when repairing or lifting the agricultural implements for transfer. In addition, controlling the internal leakage by adjusting the clearance between the valve stem and the valve body will also increase the friction coefficient, aggravating the wear of the valve stem and the valve body and reducing the service life. Content of the Utility Model

[0003] The purpose of the utility model is to solve the above-mentioned deficiencies of the prior art and provide a multi-way valve for a tractor with a hydraulic lock.

[0004] A multi-way valve for a tractor with a hydraulic lock includes a first reversing valve and a second reversing valve. The first reversing valve is a four-position seven-way reversing valve, which includes a first inlet, a second inlet, a third inlet, a fourth inlet, a first outlet, a second outlet, and a third outlet. The first inlet is connected to the oil return tank through a first oil passage, the second inlet is connected to a hydraulic source through a second oil passage, the third inlet is connected to the hydraulic source through a third oil passage, the fourth inlet is normally closed, and a check valve is provided on the third oil passage. The first outlet is connected to a working hydraulic component through a fourth oil passage, the second outlet is connected to the oil return tank through a fifth oil passage, and the third outlet is connected to the working hydraulic component through a sixth oil passage.

[0005] The four-position seven-way reversing valve includes a first working position, a second working position, a third working position, and a fourth working position. In the first working position: the first inlet is connected to the first outlet and the third outlet, the second inlet is connected to the second outlet, and the third inlet and the fourth inlet are closed; in the second working position: the first inlet is connected to the third outlet, the second inlet is closed, the third inlet is connected to the first outlet, and the second outlet is closed; in the third working position: the first inlet, the third inlet, the first outlet, and the third outlet are closed, and the second inlet is connected to the second outlet; in the fourth working position: the first inlet is connected to the first outlet, the second inlet and the second outlet are closed, and the third inlet is connected to the third outlet.

[0006] The second reversing valve is a three-position six-way reversing valve. The three-position six-way reversing valve includes a first inlet, a second inlet, a third inlet, a first outlet, a second outlet, and a third outlet. Its first inlet is connected to the oil return tank through a seventh oil passage, its second inlet is connected to the hydraulic source through an eighth oil passage, its third inlet is connected to the hydraulic source through a ninth oil passage, and a check valve is provided on the ninth oil passage. Its first outlet is connected to the working hydraulic component through a tenth oil passage, its second outlet is connected to the oil return tank through an eleventh oil passage, and its third outlet is connected to the working hydraulic component through a twelfth oil passage;

[0007] The three-position six-way reversing valve includes a first working position, a second working position, and a third working position. In its first working position: the first inlet is connected to the third outlet, the third inlet is connected to the first outlet, and the second inlet and the second outlet are closed; in its second working position: the first inlet, the third inlet, the first outlet, and the third outlet are closed, and the second inlet is connected to the second outlet; in its third working position: the first inlet is connected to the first outlet, the third inlet is connected to the third outlet, and the second inlet and the second outlet are closed;

[0008] Hydraulic lock structures are provided on both the sixth oil passage and the twelfth oil passage.

[0009] Preferably, the fourth oil passage and the tenth oil passage are each connected to the oil return tank through a thirteenth oil passage, and a stop valve is provided on the thirteenth oil passage.

[0010] Preferably, the multi-way valve includes an output connection, a tail connection, a lift connection, and an inlet and return oil connection. The hydraulic lock structure is located in the valve bodies of the output connection and the lift connection. The valve body is provided with a valve cavity and oil passages. The valve cavity is arranged horizontally, and the oil passages are arranged vertically. The oil passages are connected to the valve cavity. A valve rod is movably inserted through the valve cavity. The hydraulic lock structure is installed in the oil passage. The valve rod is used to control the movement of the hydraulic lock structure to control the opening and closing of the oil passage. The hydraulic lock structure is provided with an internal passage and an external passage.

[0011] The valve rod is provided with an annular groove. At least one side wall of the annular groove is an inclined surface, and the inclination direction of the inclined surface is from the bottom of the groove to the outside of the top of the groove. An inward shoulder structure is provided at the lower end inside the oil passage. The hydraulic lock structure includes a valve core, a spring seat, a compression spring, a steel ball, a connecting rod, and a push rod. The upper part of the valve core is wider than the lower part. The upper part of the valve core is lapped on the shoulder structure. The valve core is provided with a through hole penetrating its upper end face and lower end face. An inward shoulder is provided at the bottom end of the through hole. A steel ball is lapped above the shoulder. A compression spring is provided above the steel ball. The compression spring is sleeved on the outer arc surface of the support rod at the bottom of the spring seat. The spring seat is located above the valve core. One end of the compression spring is in contact with the bottom surface of the spring seat, and the other end of the spring is in contact with the steel ball;

[0012] Below the valve core is provided with a push rod, which is movably arranged in the valve body. The moving track direction of the push rod is the same as that of the valve core. The push rod cooperates with the side wall of the annular groove inclined surface structure. The push rod is used to apply a thrust to the bottom of the valve core. At the top of the push rod is provided with a connecting rod. The upper end of the push rod is wider than the aperture of the connecting rod and the through hole. The connecting rod is movably arranged in the through hole. The connecting rod is used to lift the steel ball. The connecting rod and the through hole are in clearance fit.

[0013] Preferably, the bottom of the push rod is a spherical structure.

[0014] Preferably, the spring seat is provided with a plurality of notches penetrating the upper end face and the lower end face.

[0015] Beneficial effects: Compared with the prior art, the utility model is optimized under the conditions of the prior art. Each connection adopts a unique mechanical linkage type hydraulic lock structure to prevent the decline caused by external impact or the self-weight of agricultural machinery, making the agricultural implements simpler, more convenient and safer. There is no need to worry about the decline during the use of agricultural implements for long-term transfer, etc., enhancing safety and stability. Description of the Drawings

[0016] Figure 1 is an internal schematic diagram of the output connection of the multi-way valve;

[0017] Figure 2 is a schematic diagram of the principle of a tractor multi-way valve with a hydraulic lock;

[0018] In the figure, 1. Valve body, 2. Valve rod, 3. Valve core, 4. Spring seat, 5. Compression spring, 6. Steel ball, 7. Connecting rod, 8. Push rod, 9. Annular groove, 10. Inclined surface, 11. First oil circuit, 12. Second oil circuit, 13. Third oil circuit, 14. Fourth oil circuit, 15. Fifth oil circuit, 16. Sixth oil circuit, 17. Seventh oil circuit, 18. Eighth oil circuit, 19. Ninth oil circuit, 20. Tenth oil circuit, 21. Eleventh oil circuit, 22. Twelfth oil circuit, 23. Thirteenth oil circuit, 24. First reversing valve, 25. Second reversing valve, 26. Hydraulic lock structure, 27. Stop valve, 28. Check valve. Specific Embodiments

[0019] In order to deepen the understanding of the present utility model, the following will further elaborate on the present utility model in combination with embodiments and drawings. The embodiments are only used to explain the present utility model and do not constitute a limitation to the protection scope of the present utility model.

[0020] Such as Figure 1-2As shown, there are valve body 1, valve rod 2, valve core 3, spring seat 4, compression spring 5, steel ball 6, connecting rod 7, ejector rod 8, annular groove 9, inclined surface 10, first oil passage 11, second oil passage 12, third oil passage 13, fourth oil passage 14, fifth oil passage 15, sixth oil passage 16, seventh oil passage 17, eighth oil passage 18, ninth oil passage 19, tenth oil passage 20, eleventh oil passage 21, twelfth oil passage 22, thirteenth oil passage 23, first reversing valve 24, second reversing valve 25, hydraulic lock structure 26, stop valve 27, check valve 28;

[0021] A tractor multi-way valve with a hydraulic lock includes a first reversing valve 24 and a second reversing valve 25. The first reversing valve 24 is a four-position seven-way reversing valve. The four-position seven-way reversing valve includes a first inlet, a second inlet, a third inlet, a fourth inlet, a first outlet, a second outlet, and a third outlet. The first inlet is connected to the oil return tank through the first oil passage 11. The second inlet is connected to the hydraulic source through the second oil passage 12. The third inlet is connected to the hydraulic source through the third oil passage 13. The fourth inlet is normally closed, and a check valve 28 is provided on the third oil passage 13. The first outlet is connected to the working hydraulic component through the fourth oil passage 14. The second outlet is connected to the oil return tank through the fifth oil passage 15. The third outlet is connected to the working hydraulic component through the sixth oil passage 16;

[0022] The four-position seven-way reversing valve includes a first working position, a second working position, a third working position, and a fourth working position. In its first working position: the first inlet is connected to the first outlet and the third outlet, the second inlet is connected to the second outlet, and the third inlet and the fourth inlet are closed; in its second working position: the first inlet is connected to the third outlet, the second inlet is closed, the third inlet is connected to the first outlet, and the second outlet is closed; in its third working position: the first inlet, the third inlet, the first outlet, and the third outlet are closed, and the second inlet is connected to the second outlet; in its fourth working position: the first inlet is connected to the first outlet, the second inlet and the second outlet are closed, and the third inlet is connected to the third outlet;

[0023] The second reversing valve 25 is a three-position six-way reversing valve. The three-position six-way reversing valve includes a first inlet, a second inlet, a third inlet, a first outlet, a second outlet, and a third outlet. Its first inlet is connected to the oil return tank through the seventh oil passage 17. Its second inlet is connected to the hydraulic source through the eighth oil passage 18. Its third inlet is connected to the hydraulic source through the ninth oil passage 19, and a check valve 28 is provided on the ninth oil passage 19. Its first outlet is connected to the working hydraulic component through the tenth oil passage 20. Its second outlet is connected to the oil return tank through the eleventh oil passage 21. Its third outlet is connected to the working hydraulic component through the twelfth oil passage 22;

[0024] The three-position six-way directional control valve includes a first working position, a second working position, and a third working position. In its first working position: the first inlet is connected to the third outlet, the third inlet is connected to the first outlet, and the second inlet and the second outlet are closed; in its second working position: the first inlet, the third inlet, the first outlet, and the third outlet are closed, and the second inlet is connected to the second outlet; in its third working position: the first inlet is connected to the first outlet, the third inlet is connected to the third outlet, and the second inlet and the second outlet are closed;

[0025] In this embodiment, the number of the first directional control valves is one, corresponding to the lifting connection, and the number of the second directional control valves is two, corresponding to the force output connection. As shown in the schematic diagram, the second outlet of the first directional control valve is connected to the second inlet of the second directional control valve, and between the two second directional control valves, their respective second inlets and second outlets are also connected. When in the middle working position, the hydraulic source passes through the first directional control valve and the second directional control valve and returns to the oil return tank.

[0026] Hydraulic lock structures 26 are provided on both the sixth oil passage 16 and the twelfth oil passage 22.

[0027] In this embodiment, the fourth oil passage 14 and the tenth oil passage 20 are each connected to the oil return tank through the thirteenth oil passage 23, and a stop valve 27 is provided on the thirteenth oil passage 23.

[0028] In this embodiment, the multi-way valve includes an output connection, a tail connection, a lifting connection, and an inlet and return oil connection. The hydraulic lock structure 26 is located in the valve body 1 of the output connection and the lifting connection. In this embodiment, taking the output connection as an example, the specific content of the hydraulic lock structure is shown;

[0029] A valve cavity and oil passages are provided in the valve body 1. The valve cavity is arranged horizontally, and the oil passages are arranged vertically. The oil passages are communicated with the valve cavity. A valve rod 2 is movably inserted through the valve cavity. The hydraulic lock structure 26 is installed in the oil passage. The valve rod 2 is used to control the movement of the hydraulic lock structure 26 to control the opening and closing of the oil passage. The hydraulic lock structure 26 is provided with an internal passage and an external passage.

[0030] An annular groove 9 is provided on the valve rod 2. At least one side wall of the annular groove 9 is an inclined surface 10, and the inclination direction of the inclined surface 10 is from the bottom surface of the groove to the outside of the top of the groove. An inward shoulder structure is provided at the lower end inside the oil passage. The hydraulic lock structure 26 includes a valve core 3, a spring seat 4, a compression spring 5, a steel ball 6, a connecting rod 7, and a push rod 8. The upper part of the valve core 3 is wider than the lower part. The upper part of the valve core 3 is lapped on the shoulder structure. A through hole penetrating the upper end surface and the lower end surface of the valve core 3 is provided on the valve core 3. An inward shoulder is provided at the bottom end of the through hole. The steel ball 6 is lapped above the shoulder. The compression spring 5 is provided above the steel ball 6. The compression spring 5 is sleeved on the outer arc surface of the support rod at the bottom of the spring seat 4. The spring seat 4 is located above the valve core 3. One end of the compression spring 5 is in contact with the bottom surface of the spring seat 4, and the other end of the spring is in contact with the steel ball 6;

[0031] Below the spool 3, there is a push rod 8. The push rod 8 is movably inserted into the valve body 1. The moving track direction of the push rod 8 is the same as that of the spool 3. The push rod 8 cooperates with the side wall of the structure of the annular groove 9 and the inclined surface 10. The push rod 8 is used to apply a thrust to the bottom of the spool 3. At the top of the push rod 8, there is a connecting rod 7. The upper end of the push rod 8 is wider than the aperture of the connecting rod 7 and the through hole. The connecting rod 7 is movably inserted into the through hole. The connecting rod 7 is used to lift the steel ball 6. The connecting rod 7 and the through hole are in clearance fit.

[0032] In this embodiment, the bottom of the push rod 8 is a spherical structure.

[0033] In this embodiment, the spring seat 4 is provided with a plurality of notches penetrating the upper end face and the lower end face.

[0034] For the specific oil circuit and the internal oil circuit direction of the directional control valve, please refer to Figure 1 ;

[0035] Instructions for using the hydraulic lock: When the hydraulic lock works, through the cooperation of its spool and the conical surface of the valve body, the oil circuit is sealed, so that the oil fluid cannot enter the valve body from the outside of the oil port and return oil, blocking the oil circuit, and then realizing the retention of the lifting height of the agricultural machinery.

[0036] When wanting to lower the agricultural machinery, by pulling the valve rod to move to the right in the valve body, the valve rod with an inclined surface can push the push rod of the hydraulic lock upward. The top of the push rod pushes up the steel ball inside the spool to overcome the spring force and the hydraulic pressure difference and move upward. At this time, the high and low pressures are connected, and the pressure is unloaded. When the valve rod continues to move to the right, the push rod can overcome the hydraulic pressure difference and push up the spool, so that the oil fluid quickly returns oil, the oil circuit remains unobstructed, and the agricultural machinery descends.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tractor multi-way valve with a hydraulic lock, characterized in that: It includes a first reversing valve and a second reversing valve, wherein the first reversing valve is a four-position seven-way reversing valve, and the four-position seven-way reversing valve includes a first inlet, a second inlet, a third inlet, a fourth inlet, a first outlet, a second outlet, and a third outlet, wherein the first inlet is connected to the oil return tank through a first oil circuit, the second inlet is connected to the hydraulic source through a second oil circuit, the third inlet is connected to the hydraulic source through a third oil circuit, the fourth inlet is normally closed, and a one-way valve is provided on the third oil circuit, the first outlet is connected to the working hydraulic element through a fourth oil circuit, the second outlet is connected to the oil return tank through a fifth oil circuit, and the third outlet is connected to the working hydraulic element through a sixth oil circuit; The four-position seven-way reversing valve comprises a first station, a second station, a third station and a fourth station. In the first station, the first inlet is connected to the first outlet and the third outlet, the second inlet is connected to the second outlet, and the third inlet and the fourth inlet are closed; in the second station, the first inlet is connected to the third outlet and the second inlet is closed, the third inlet is connected to the first outlet, and the second outlet is closed; in the third station, the first inlet, the third inlet, the first outlet and the third outlet are closed, and the second inlet is connected to the second outlet; in the fourth station, the first inlet is connected to the first outlet, the second inlet and the second outlet are closed, and the third inlet is connected to the third outlet; The second reversing valve is a three-position six-way reversing valve, which includes a first inlet, a second inlet, a third inlet, a first outlet, a second outlet, and a third outlet. The first inlet is connected to the oil return tank through the seventh oil circuit, the second inlet is connected to the hydraulic source through the eighth oil circuit, the third inlet is connected to the hydraulic source through the ninth oil circuit, and a one-way valve is provided on the ninth oil circuit. The first outlet is connected to the working hydraulic element through the tenth oil circuit, the second outlet is connected to the oil return tank through the eleventh oil circuit, and the third outlet is connected to the working hydraulic element through the twelfth oil circuit. The three-position six-way reversing valve includes a first station, a second station and a third station. In the first station, the first inlet is connected to the third outlet, the third inlet is connected to the first outlet, and the second inlet and the second outlet are closed; in the second station, the first inlet, the third inlet, the first outlet and the third outlet are closed, and the second inlet is connected to the second outlet; in the third station, the first inlet is connected to the first outlet, the third inlet is connected to the third outlet, and the second inlet and the second outlet are closed; Hydraulic lock structures are provided on the sixth oil circuit and the twelfth oil circuit.

2. A tractor multi-way valve with a hydraulic lock according to claim 1, characterized in that: The fourth oil circuit and the tenth oil circuit are connected to the oil return tank through the thirteenth oil circuit, and a stop valve is arranged on the thirteenth oil circuit.

3. A tractor multi-way valve with a hydraulic lock according to claim 1, characterized in that: The multi-way valve comprises an output link, a tail link, a lifting link, and an oil inlet and return link. The hydraulic lock structure is located in the valve body of the output link and the lifting link. The valve body is provided with a valve cavity and an oil circuit. The valve cavity is arranged horizontally, and the oil circuit is arranged longitudinally. The oil circuit is connected with the valve cavity. A valve stem is movably provided in the valve cavity. The hydraulic lock structure is installed in the oil circuit. The valve stem is used to control the movement of the hydraulic lock structure so as to control the opening and closing of the oil circuit. The hydraulic lock structure is provided with an internal passage and an external passage. The valve stem is provided with an annular groove, the side wall of at least one side of the annular groove is an inclined surface, and the inclination direction of the inclined surface is from the bottom surface of the groove to the outside of the top of the groove, the lower end of the oil circuit is provided with an inward shoulder structure, the hydraulic lock structure comprises a valve core, a spring seat, a compression spring, a steel ball, a connecting rod, and a push rod, the upper part of the valve core is wider than the lower part, the upper part of the valve core is overlapped on the shoulder structure, the valve core is provided with a through hole penetrating its upper end face and lower end face, the bottom end of the through hole is provided with an inward shoulder, a steel ball is overlapped above the shoulder, a compression spring is provided above the steel ball, the compression spring is sleeved on the outer arc surface of the support rod at the bottom of the spring seat, the spring seat is located above the valve core, one end of the compression spring is in contact with the bottom surface of the spring seat, and the other end of the spring is in contact with the steel ball; A push rod is provided below the valve core, and the push rod is movably inserted into the valve body. The direction of the moving trajectory of the push rod is the same as that of the moving trajectory of the valve core. The push rod cooperates with the side wall of the inclined surface structure of the annular groove. The push rod is used to apply thrust to the bottom of the valve core. A connecting rod is provided on the top of the push rod. The upper end of the push rod is wider than the aperture of the connecting rod and the through hole. The connecting rod is movably inserted into the through hole. The connecting rod is used to lift the steel ball, and the connecting rod and the through hole are clearance-fitted.

4. A tractor multi-way valve with a hydraulic lock according to claim 3, characterized in that: The bottom of the top rod is a spherical structure.

5. A tractor multi-way valve with a hydraulic lock according to claim 4, characterized in that: The spring seat is provided with a plurality of notches penetrating the upper end surface and the lower end surface.

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