Fully automatic hydraulic reversing device

Abstract

The present invention provides a fully automatic hydraulic reversing device, which includes an oil inlet pipeline with an oil inlet, an oil outlet pipeline with an oil outlet, an air inlet pipeline and an exhaust pipeline that can be connected to the oil outlet pipeline, an oil cylinder is provided between the oil inlet pipeline and the oil outlet pipeline, the internal structure of the oil cylinder includes an oil flow cavity and a gas flow cavity that are not connected to each other, auxiliary reversing valves are provided at both ends of the oil cylinder, and a main reversing valve that can conduct the oil inlet and the oil outlet is provided between the two auxiliary reversing valves; the air inlet pipeline and the exhaust pipeline are respectively connected to the two sides of the oil cylinder, and both can be connected to the gas flow cavity, and the gas flowing from the air inlet pipeline to the gas flow cavity can flow unidirectionally to the exhaust pipeline due to the change of oil pressure in the oil flow cavity, and be discharged through the oil outlet on the oil outlet pipeline. The fully automatic hydraulic reversing device of the present invention can realize the discharge of gas under the reversing flow of the oil circuit, and has the advantages of ingenious structural design and good use effect.

Description

Technical Field

[0001] The invention relates to the technical field of oil production pipeline equipment, and in particular to a full-automatic hydraulic reversing device. Background Art

[0002] In the process of oil extraction, the produced oil is usually accompanied by natural gas, and they are extracted together. During the self-flowing stage of the oil well, due to the high formation pressure, they can be mixed together and sprayed out from the oil well, and transported to the oil gathering station through pipelines. After the oil well has been mined for a period of time, the formation pressure drops. At this time, mechanical oil extraction is required. The oil pump is lowered into the oil well, and the pumping unit is installed on the ground. They are connected by sucker rods and oil pipes to extract oil. When the 'oil-gas ratio' is small, the natural gas content is very small, and they will separate in the oil well. The crude oil is lifted to the ground through the oil pipe by the pumping unit, and then transported to the oil gathering station through the pipeline, while the natural gas will be stored in the annulus of the oil casing of the oil well. When the natural gas accumulates more, the casing pressure of the oil well will increase. This pressure acts on the formation, which will affect the seepage of crude oil and reduce the production of the oil well. Therefore, after a period of time, oil workers are needed to go to the oil well site to open the casing valve of the oil well and discharge the natural gas in the casing into the atmosphere in order to reduce the casing pressure and increase the production of the oil well.

[0003] However, the above method will increase the workload of oil workers, but also waste natural gas resources and pollute the air. In addition, when the solubility of the discharged natural gas is high, it is easy to cause the risk of fire and explosion. In addition, since the "oil-gas ratio" of each oil well is different, the speed of casing pressure increase is also different. If the casing valve is opened manually, it will firstly lead to high labor intensity for workers, and secondly, the casing valve will not be opened in time, which will inevitably affect the production and working efficiency of the oil well. In addition, if a separate pipeline is laid for the discharge of natural gas, it will be particularly wasteful and costly. Summary of the invention

[0004] In view of this, the present invention aims to provide a fully automatic hydraulic reversing device to solve at least one of the deficiencies in the prior art and achieve better use effects.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] and a tube connecting the discharging opening of the pump with a plug in the forward end of the crank case, and a tube connecting the discharging opening of the pump with a plug in the forward end of the crank case, wherein the pump connects the pump to the oil pump end, and the tube connecting the discharging opening of the pump is connected with the oil outlet of the pump.

[0007] Furthermore, a first valve and a second valve are respectively provided on the oil inlet pipeline and the oil outlet pipeline.

[0008] Furthermore, a bypass pipeline is connected between the oil inlet pipeline and the oil outlet pipeline, the inlet end of the bypass pipeline is arranged between the oil inlet and the first valve, and the outlet end of the bypass pipeline is arranged between the oil outlet and the second valve, and a third valve is provided on the bypass pipeline.

[0009] Furthermore, a safety pressure regulating valve is provided on the oil inlet pipeline, an intake check valve is provided on the air inlet pipeline, and an exhaust check valve is provided on the exhaust pipeline.

[0010] Furthermore, a fourth valve is provided on the exhaust pipeline.

[0011] Furthermore, a guide sleeve is fixedly connected in the oil cylinder for connecting with the intake pipeline and the exhaust pipeline, a piston rod is slidably provided on the guide sleeve, and first pistons are respectively provided at both ends of the piston rod. The two first pistons and the inner wall of the oil cylinder and the outer wall of the piston rod form the gas circulation cavity, and the guide sleeve divides the gas circulation cavity into air cavity a and air cavity b.

[0012] Furthermore, a reversing rod is provided in the piston rod, and the reversing rod is slidably arranged relative to the oil cylinder, and the two ends of the reversing rod are respectively connected to the auxiliary reversing valve core on the auxiliary reversing valve, the reversing valve core and the first piston located at the two ends respectively form the oil path flow cavity with the inner wall of the oil cylinder, and the oil path flow cavity is divided into oil chamber a and oil chamber b due to the setting of the two first pistons, the reversing rod moves along the axial direction of the oil cylinder due to the change of oil pressure in the oil cylinder a and the oil chamber b, and constitutes a trigger for the reversing action of the two auxiliary reversing valve cores.

[0013] Furthermore, a main reversing valve core that can reciprocate along the axial direction of the main reversing valve is provided in the main reversing valve, and a main valve oil chamber a and a main valve oil chamber b are constructed at both ends of the main reversing valve core, and a main valve oil circuit a and a main valve oil circuit b are respectively connected between the main valve oil chamber a and the main valve oil chamber b and the corresponding two auxiliary reversing valves.

[0014] Furthermore, an oil return pipe a and an oil return pipe b are respectively connected between the main reversing valve core and the oil chamber a and the oil chamber b.

[0015] Furthermore, an oil drain pipe a and an oil drain pipe b are respectively connected between the two auxiliary reversing valves and the oil outlet pipeline.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) The fully automatic hydraulic reversing device of the present invention is provided with oil flow chambers and gas flow chambers which are different from each other in the oil cylinder, and with auxiliary reversing valves and main reversing valves, so that the fully automatic hydraulic reversing device can respectively allow oil to flow in from the oil inlet and gas to flow in from the air inlet, and when the auxiliary reversing valve and the main reversing valve are coordinated and reversed, the oil is discharged through the oil outlet, and at the same time, the gas flowing into the gas flow chamber from the air inlet along the air inlet pipeline can be discharged to the oil outlet pipeline under the action of the oil pressure change in the oil flow chamber, and discharged from the oil outlet together with the oil.

[0018] In addition, the air intake check valve and exhaust check valve can ensure that the gas can flow in one direction only, and the safety pressure regulating valve can effectively prevent damage to the equipment connected to it caused by failure of the fully automatic hydraulic reversing device.

[0019] In addition, by setting up a bypass pipeline and a third valve on the bypass pipeline, it is possible to facilitate the maintenance of the full-automatic hydraulic reversing device while ensuring the smooth operation of the external oil circuit.

[0020] The fully automatic hydraulic reversing device has a simple structure, low cost and ingenious design, and is particularly used in the oil outlet pipeline of oil extraction. The extracted oil is connected to the oil inlet, and the gas path of the natural gas generated in the process of oil extraction is connected to the gas inlet. The natural gas can be discharged smoothly through the oil pressure of the extracted oil, thereby eliminating the need to lay a separate exhaust channel and avoiding manual exhaust operation. It can better ensure the smoothness of oil extraction and improve the output and work efficiency of the oil well, thereby having a better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic structural diagram of a fully automatic hydraulic reversing device according to an embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a fully automatic hydraulic reversing device according to an embodiment of the present invention from one viewing angle (at the exit);

[0024] Figure 3 It is a structural schematic diagram of another perspective (bottom) of the fully automatic hydraulic reversing device according to an embodiment of the present invention;

[0025] Figure 4 A partial cross-sectional view of a fully automatic hydraulic reversing device according to an embodiment of the present invention;

[0026] Figure 5 It is a hydraulic principle diagram of the fully automatic hydraulic reversing device according to an embodiment of the present invention;

[0027] Description of reference numerals:

[0028] 1. Oil cylinder; 2. Auxiliary reversing valve; 3. Main reversing valve; 4. Bypass oil circuit; 5. First valve; 6. Second valve; 7. Third valve; 8. Fourth valve;

[0029] 10. Oil inlet; 20. Oil outlet; 30. Air inlet; 40. Safety pressure regulating valve; 50. Air inlet check valve; 60. Exhaust check valve;

[0030] 11. Oil inlet pipe a; 12. Oil inlet pipe b; 13. Main valve oil circuit a; 14. Main valve oil circuit b; 15. Oil return pipe a; 16. Oil return pipe b; 17. Oil drain pipe a; 18. Oil drain pipe b;

[0031] 100, air cavity a; 200, air cavity b; 300, oil cavity a; 400, oil cavity b;

[0032] 101, guide sleeve; 102, reversing rod; 103, piston rod; 104, first piston; 201, auxiliary reversing valve core; 301, main reversing valve core; 302, second piston. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", "left", "right", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] This embodiment relates to a fully automatic hydraulic reversing device, an exemplary structure of which is as follows: Figures 1 to 4 As shown, the fully automatic hydraulic reversing device mainly comprises an oil inlet pipeline with an oil inlet 10, an oil outlet pipeline with an oil outlet 20, an air inlet pipeline with an air inlet 30, an exhaust pipeline connectable to the oil outlet pipeline, a cylinder 1, a main reversing valve 3 and an auxiliary reversing valve 2, etc., wherein the cylinder 1 is arranged between the oil inlet pipeline and the oil outlet pipeline, and the internal structure of the cylinder 1 has different oil flow cavities and gas flow cavities, auxiliary reversing valves 2 connected to the oil flow cavities are respectively arranged at both ends of the cylinder 1, and a main reversing valve 3 for conducting the oil inlet 10 and the oil outlet 20 is arranged between the two auxiliary reversing valves 2.

[0037] The air intake pipe and the exhaust pipe are respectively connected to the two sides of the oil cylinder 1, and both can be communicated with the gas circulation cavity. The gas flowing from the air intake pipe into the gas circulation cavity can flow unidirectionally to the exhaust pipe due to the change of oil pressure in the oil circulation cavity, and be discharged through the oil outlet 20 on the oil outlet pipe.

[0038] Specific, combined Figures 1 to 4 As shown, a guide sleeve 101 is fixedly connected in the oil cylinder 1 for connecting with the air intake pipeline and the exhaust pipeline, wherein the guide sleeve 101 has a hollow cylindrical section fixedly connected to the inner wall of the oil cylinder 1, and a concave conical surface connected to both ends of the cylindrical section, and a plurality of vents are constructed on the conical surface. A piston rod 103 is slidably arranged on the guide sleeve 101, that is, in the cylindrical section, and a first piston 104 is respectively arranged at both ends of the piston rod 103 to seal against the inner wall of the oil cylinder 1. A gas circulation cavity is formed between the two first pistons 104 and the inner wall of the oil cylinder 1 and the outer wall of the piston rod 103, and the guide sleeve 101 divides the gas circulation cavity into an air cavity a100 and an air cavity b200. In this way, when the main reversing valve 3 and the auxiliary reversing valve 2 are in reversing action, the gas in the air cavity a100 and the air cavity b200 can be discharged alternately.

[0039] In addition, in this embodiment, Figure 4As shown, a reversing rod 102 is provided in the piston rod 103, and the reversing rod 102 can be slidably arranged relative to the cylinder 1, and the two ends of the reversing rod 102 are respectively connected to the auxiliary reversing valve core 201 on the auxiliary reversing valve 2, and the reversing valve core and the first piston 104 located at the two ends respectively form an oil path flow cavity with the inner wall of the cylinder 1, and the oil path flow cavity is divided into an oil chamber a300 and an oil chamber b400 due to the two first pistons 104 set at intervals. The reversing rod 102 can move along the axial direction of the cylinder 1 due to the change of oil pressure in the cylinder 1a and the oil chamber b400, thereby driving the two auxiliary reversing valve cores 201 to perform a reversing action, thereby realizing the reversal of oil in the oil path flow cavity.

[0040] In addition, by Figure 4 Combination Figures 1 to 3 As shown, a main reversing valve core 301 is provided in the main reversing valve 3, which can reciprocate along the axial direction of the main reversing valve 3. A main valve oil chamber a and a main valve oil chamber b are constructed at both ends of the main reversing valve core 301. A main valve oil circuit a13 and a main valve oil circuit b14 are respectively connected between the main valve oil chamber a and the main valve oil chamber b and the corresponding two auxiliary reversing valves 2. The main reversing valve core 301 can reciprocate and perform reversing by the oil pressure changes in the main valve oil circuit a13 and the main valve oil circuit b14.

[0041] In this embodiment, a return oil pipe a15 and a return oil pipe b16 are respectively connected between the main reversing valve core 301 and the oil chamber a300 and the oil chamber b400, which are used to return the oil in the main reversing valve core 301 to the oil path flow chamber of the oil cylinder 1, thereby forming a loop and facilitating the movement of the piston rod 103 and the reversing rod 102, thereby triggering the reversing of the auxiliary reversing valve 2 and allowing the gas in the air chamber a100 and chamber b to be discharged smoothly.

[0042] In addition, an oil drain pipe a17 and an oil drain pipe b18 are respectively connected between the two auxiliary reversing valves 2 and the oil outlet pipeline, so that the oil entering the oil circulation cavity can be alternately discharged from the oil drain pipe a17 and the oil drain pipe b18 to the oil outlet pipeline under the reversing action of the internal main reversing valve 3 and the auxiliary reversing valve 2, and discharged through the oil outlet port 20 of the oil outlet pipeline.

[0043] In order to facilitate the cutting off of the oil circuit between the oil inlet 10 and the oil outlet 20, in this embodiment, a first valve 5 and a second valve 6 are respectively provided on the oil inlet pipeline and the oil outlet pipeline, so as to facilitate the disassembly, assembly, replacement and maintenance of the fully automatic hydraulic reversing device. In order to further facilitate the maintenance of the equipment, a bypass pipeline is connected between the oil inlet pipeline and the oil outlet pipeline, the inlet end of the bypass pipeline is provided between the oil inlet 10 and the first valve 5, and the outlet end of the bypass pipeline is provided between the oil outlet 20 and the second valve 6, and a third valve 7 is provided on the bypass pipeline. The third valve 7 can be used to open or close the bypass pipeline.

[0044] Continue to view Figures 1 to 4 In this embodiment, the air inlet 30 is arranged at one end of the air inlet check valve 50, and the external air source flows into the air inlet pipeline through the air inlet 30 on the air inlet check valve 50. In order to protect the equipment connected to the fully automatic hydraulic reversing device of this embodiment, in this embodiment, a safety pressure regulating valve 40 is arranged on the oil inlet pipeline. If the fully automatic hydraulic reversing device of this embodiment fails, the oil inlet pipeline can be depressurized by the safety pressure regulating valve 40 to protect the external connected equipment. In addition, in this embodiment, a fourth valve 8 is arranged on the exhaust pipeline to cut off the air path, so as to facilitate the inspection and maintenance of the parts on the gas flow path.

[0045] The working principle of the fully automatic hydraulic reversing device of this embodiment is explained in detail by taking its application to the oil outlet pipeline of oil extraction equipment as an example, wherein the extracted oil is connected to the oil inlet 10, and the gas path of the natural gas generated in the process of oil extraction is connected to the gas inlet 30. The extracted oil and natural gas can be discharged from the oil outlet 20 through the setting of the fully automatic hydraulic reversing device.

[0046] When the fully automatic hydraulic reversing device of this embodiment is working, its hydraulic principle diagram is as follows: Figure 5 As shown, the pressure oil flows into the auxiliary reversing valve 2 at both ends of the oil cylinder 1 through the oil inlet 10. Due to the pressure difference between the oil inlet 10 and the oil return port, the piston in the oil cylinder 1 and the two auxiliary reversing valve cores 201 and the main reversing valve core 301 will automatically adjust their positions. It should be noted that, under normal working conditions, the first valve 5, the second valve 6 and the third valve 7 of this embodiment are in a normally open state, and the fourth valve 8 is in a normally closed state.

[0047] like Figure 5 In the state shown, when the pressure oil flows into the left oil port p of the auxiliary reversing valve 2 located on the left side through the oil inlet pipe a11, at this time, the main valve oil circuit a13 connects the auxiliary reversing valve 2 with the main reversing valve 3, the return oil pipeline a connects the main reversing valve core 301 with the oil chamber a300, the return oil pipeline b connects the main reversing valve core 301 with the oil chamber b400, and the return oil pipeline b is connected with the oil outlet pipeline. The pressure oil enters the main valve oil chamber a, making the oil pressure in the main valve oil chamber a greater than the oil pressure in the main valve oil chamber b, thereby pushing the main reversing valve 3 to move rightward to enable reversing.

[0048] The other pressure oil flows into the oil chamber a300 through the valve core of the main reversing valve 3, so that the oil pressure in the oil chamber a300 is greater than the oil pressure in the oil chamber b400, thereby pushing the piston rod 103 to move to the right. At this time, the pressure in the air chamber a100 is greater than the pressure in the air chamber b200. When the pressure in the air chamber a100 is large enough, the left exhaust check valve 60 on the exhaust pipe can be opened. At this time, the pressure in the air chamber b200 is small enough to open the check valve on the intake pipe to suck the gas into the air chamber b200. As the piston rod 103 moves to the right, the gas in the air chamber a100 can be merged into the oil drain pipe through the exhaust pipe and discharged from the oil outlet 20.

[0049] When the first piston 104 on the left side presses against the guide sleeve 101, the air chamber a100 is blocked, and the air chamber b200 is connected to the exhaust check valve 60 on the right side. As the oil pressure in the oil chamber a300 continues to increase, the reversing rod 102 moves to the right. When the right end of the reversing rod 102 moves to the rightmost end of the oil cylinder 1, the two auxiliary reversing valves 2 perform a reversing action, that is, the two auxiliary reversing valves 2 are switched from the left position to the right position. At this time, the pressure oil flows along the oil inlet pipe b12 to the oil port p of the right auxiliary reversing valve 2, and the main valve oil circuit b14 connects the auxiliary reversing valve 2 with the main reversing valve 3, and the main valve oil circuit a13 is connected to the oil drain pipe a17 through the right position of the auxiliary reversing valve 2.

[0050] The pressure oil enters the main valve oil chamber b, making the oil pressure in the main valve oil chamber b greater than the oil pressure in the main valve oil chamber a, thereby pushing the main reversing valve 3 to move to the left to enable reversing. The other pressure oil flows into the oil chamber b400 through the valve core of the main reversing valve 3, making the oil pressure in the oil chamber b400 greater than the oil pressure in the oil chamber a300, thereby pushing the piston rod 103 to move to the left. At this time, the air chamber a100 turns from the blocked state to the open state, so that the intake check valve 50 at the air inlet 30 opens to suck gas into the air chamber a100. As the piston rod 103 moves, the pressure of the air chamber b200 increases. When the pressure of the air chamber b200 is large enough to open the right exhaust check valve 60 on the exhaust pipeline, the gas in the air chamber b200 can be merged into the oil discharge pipeline through the exhaust pipeline and discharged from the oil outlet 20.

[0051] When the first piston 104 on the right side presses against the guide sleeve 101, the air chamber b200 is blocked, and the air chamber a100 is connected to the exhaust check valve 60 on the left side. As the oil pressure in the oil chamber b400 continues to increase, the reversing rod 102 moves to the left, and when the left end of the reversing rod 102 moves to the leftmost end of the oil cylinder 1, the two auxiliary reversing valves 2 perform a reversing action, thus completing a reciprocating reversing motion.

[0052] When the fully automatic hydraulic reversing device fails or needs to be repaired or replaced, it is only necessary to close the first valve 5, the second valve 6, and the fourth valve 8 and open the third valve 7. At this time, the pipeline or parts between the first valve 5 and the second valve 6 can be disassembled without interrupting the oil production, so as to ensure the continuity of oil production and thus improve the efficiency of oil production.

[0053] The fully automatic hydraulic reversing device of the present embodiment has a simple structure and an ingenious design. By providing an oil cylinder 1 having an oil flow chamber and a gas flow chamber, a main reversing valve 3 and an auxiliary reversing valve 2, it is possible to achieve gas discharge under the reversing flow of the oil circuit, so that during oil extraction, there is no need to lay an additional exhaust channel for natural gas, and the problems of high work intensity and environmental pollution caused by manual exhaust operation are avoided. At the same time, by using the fully automatic hydraulic reversing device, the smoothness of oil extraction can be better guaranteed, and the output and work efficiency of the oil well can be improved, and it has a good use effect.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully automatic hydraulic reversing device, characterized in that: The invention comprises an oil inlet pipeline having an oil inlet (10), an oil outlet pipeline having an oil outlet (20), an air inlet pipeline having an air inlet (30), and an air exhaust pipeline connectable to the oil outlet pipeline. An oil cylinder (1) is provided between the oil inlet pipeline and the oil outlet pipeline. The oil cylinder (1) has an internal structure that includes an oil flow cavity and a gas flow cavity that are not connected to each other. Auxiliary reversing valves (2) that are connected to the oil flow cavity are provided at both ends of the oil cylinder (1). A main reversing valve (3) is provided between the auxiliary reversing valve (2) for conducting the oil inlet (10) and the oil outlet (20); the air inlet pipeline and the exhaust pipeline are respectively connected to the two sides of the oil cylinder (1), and both can be conducted with the gas circulation cavity; the gas flowing from the air inlet pipeline into the gas circulation cavity can flow unidirectionally into the exhaust pipeline due to the change of oil pressure in the oil circulation cavity, and be discharged through the oil outlet (20) on the oil outlet pipeline; A guide sleeve (101) is fixedly connected in the oil cylinder (1) for connecting with the air intake pipeline and the exhaust pipeline, a piston rod (103) is slidably provided on the guide sleeve (101), first pistons (104) are respectively provided at both ends of the piston rod (103), the two first pistons (104) and the inner wall of the oil cylinder (1) and the outer wall of the piston rod (103) form the gas circulation cavity, and the guide sleeve (101) divides the gas circulation cavity into an air cavity a (100) and an air cavity b (200); A reversing rod (102) is provided in the piston rod (103), the reversing rod (102) is slidably arranged relative to the oil cylinder (1), and the two ends of the reversing rod (102) are respectively connected to the auxiliary reversing valve core (201) on the auxiliary reversing valve (2), the reversing valve core and the first piston (104) at the two ends respectively form the oil path circulation cavity with the inner wall of the oil cylinder (1), and the oil path circulation cavity is divided into an oil chamber a (300) and an oil chamber b (400) due to the arrangement of the two first pistons (104), the reversing rod (102) moves along the axial direction of the oil cylinder (1) due to the change of oil pressure in the oil chamber a (300) and the oil chamber b (400), and constitutes a trigger for the reversing action of the two auxiliary reversing valve cores (201); A main reversing valve core (301) is provided in the main reversing valve (3) and can reciprocate along the axial direction of the main reversing valve (3). A main valve oil chamber a and a main valve oil chamber b are constructed at both ends of the main reversing valve core (301). A main valve oil circuit a (13) and a main valve oil circuit b (14) are respectively connected between the main valve oil chamber a and the main valve oil chamber b and the corresponding two auxiliary reversing valves (2).

2. The fully automatic hydraulic reversing device according to claim 1 is characterized in that: A first valve (5) and a second valve (6) are respectively provided on the oil inlet pipeline and the oil outlet pipeline.

3. The fully automatic hydraulic reversing device according to claim 2 is characterized in that: A bypass pipeline is connected between the oil inlet pipeline and the oil outlet pipeline, the inlet end of the bypass pipeline is arranged between the oil inlet (10) and the first valve (5), and the outlet end of the bypass pipeline is arranged between the oil outlet (20) and the second valve (6), and a third valve (7) is provided on the bypass pipeline.

4. The fully automatic hydraulic reversing device according to claim 1 is characterized in that: A safety pressure regulating valve (40) is provided on the oil inlet pipeline, an inlet check valve (50) is provided on the air inlet pipeline, and an exhaust check valve (60) is provided on the exhaust pipeline.

5. The fully automatic hydraulic reversing device according to claim 1 is characterized in that: A fourth valve (8) is provided on the exhaust pipeline.

6. The fully automatic hydraulic reversing device according to any one of claims 1 to 5, characterized in that: An oil return pipe a (15) and an oil return pipe b (16) are respectively connected between the main reversing valve core (301) and the oil chamber a (300) and the oil chamber b (400).

7. The fully automatic hydraulic reversing device according to claim 6 is characterized in that: An oil drain pipe a (17) and an oil drain pipe b (18) are respectively connected between the two auxiliary reversing valves (2) and the oil outlet pipeline.

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