Hinge hydraulic oil cylinder

Abstract

The invention discloses a hinge hydraulic oil cylinder which comprises a pipe body filled with hydraulic oil and provided with a first inner circumferential wall; the piston is located in the pipe body and divides the pipe body into a reset cavity and a compression cavity, the piston is used for sliding between the reset cavity and the compression cavity to generate buffering force, an oil discharge channel is formed between the radial outer surface of the piston and the first inner circumferential wall, and the oil discharge channel allows hydraulic oil to flow from the reset cavity to the compression cavity; the first buffer channel is arranged on the piston and allows the hydraulic oil to flow from the compression cavity to the reciprocating cavity; the abutting part is connected with the piston, and a movable space is formed between the abutting part and the piston; the radial outer surface of the sealing ring abuts against the first inner circumferential wall in a sealed mode, and the sealing ring is located in the movable space. According to the invention, the machining precision of parts can be reduced, the internal structure is simplified, the production cost is reduced, and the phenomenon of buffer function failure is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to a hinge hydraulic cylinder. Background Art

[0002] Hydraulic cylinders are widely used in various fields. Their main function is to act as a buffer. In the field of doors and windows, the cooperation between hydraulic cylinders and hinges can act as a buffer when doors and windows are closed, avoiding large impacts when doors and windows are closed, thereby protecting doors and windows and personnel.

[0003] However, the existing hydraulic cylinders require high precision in the fit between the cylinder body and the piston, which means high precision in the machining of the cylinder body and the piston. Due to errors in the dimensions of the cylinder body and the piston during the machining process, poor fit between the cylinder body and the piston is likely to occur. In addition, the internal structure of the hydraulic cylinder is relatively complex, with a large number of parts, and the buffering function is prone to failure. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a hinge hydraulic cylinder that can reduce the machining accuracy of parts, simplify the internal structure, reduce production costs, and reduce the phenomenon of buffer function failure.

[0005] A hinge hydraulic oil cylinder according to an embodiment of the present invention comprises: a tube body, which is filled with hydraulic oil and has a first inner peripheral wall; a piston, which is located in the tube body and divides the tube body into a reset chamber and a compression chamber, and the piston is used to slide between the reset chamber and the compression chamber to generate a buffer force, and an oil discharge channel is formed between the radial outer surface of the piston and the first inner peripheral wall, and the oil discharge channel allows the hydraulic oil to flow from the reset chamber to the compression chamber; a first buffer channel, which is arranged on the piston, and the first buffer channel allows the hydraulic oil to flow from the compression chamber to the reset chamber; an abutment portion, the abutment portion and connected to the piston, a movable space is formed between the abutting portion and the piston, and the movable space has a first position and a second position distributed along the axis of the tube body; a sealing ring, the radial outer surface of the sealing ring is in sealing abutment with the first inner circumferential wall, the sealing ring is located in the movable space, and the sealing ring can move between the first position and the second position, when the sealing ring is in the first position, the end face of the sealing ring abuts with the piston to cut off the oil discharge channel, and when the sealing ring is in the second position, the end face of the sealing ring abuts with the abutting portion to release the cut-off of the oil discharge channel.

[0006] A hinge hydraulic cylinder according to an embodiment of the present invention has at least the following beneficial effects: 1. The present invention forms an oil discharge passage between the radial outer surface of the piston and the first inner circumferential wall, and a large gap exists between the tube body and the piston. The oil discharge passage allows the hydraulic oil to flow from the reset chamber to the compression chamber, so that the piston can quickly move close to the reset chamber for reset. At the same time, the matching accuracy between the tube body and the piston is reduced, the processing accuracy of the tube body and the piston can be reduced, the manufacturing cost can be reduced, and the poor matching between the tube body and the piston can be reduced.

[0007] 2. The present invention sets a first buffer channel. When the piston is subjected to external force, the piston moves close to the compression chamber. The first buffer channel allows the hydraulic oil to flow from the compression chamber to the reset chamber. The first buffer channel is narrow, and the flow rate of the hydraulic oil allowed to flow through the first buffer channel is small, so that the piston moves slowly, thereby enabling the hydraulic cylinder to achieve a buffering function.

[0008] 3. The present invention sets an abutment portion and a sealing ring so that the sealing ring can move between a first position and a second position in the movable space. When the piston moves close to the compression chamber, the sealing ring is in the first position, and the end face of the sealing ring abuts against the piston. At the same time, the radial outer surface of the sealing ring abuts against the first inner circumferential wall, and the oil discharge channel is in a cut-off state. The hydraulic oil cannot flow from the compression chamber to the reset chamber, ensuring that the hydraulic oil only flows to the reset chamber through the first buffer channel. Therefore, the flow of the hydraulic oil is stable, and buffer failure of the hydraulic cylinder is avoided.

[0009] According to an embodiment of the present invention, a hinge hydraulic cylinder also includes an oil valve, which is a cylindrical structure. A first spiral groove is provided on the radial outer surface of the oil valve, and the first spiral groove extends around the axis of the oil valve. The piston is provided with a center hole. The oil valve and the center hole are tightly fitted, and the first buffer channel is formed between the first spiral groove and the inner wall of the center hole.

[0010] According to a hinge hydraulic oil cylinder of an embodiment of the present invention, the piston is provided with a guide hole, and the guide hole is connected with the oil discharge channel and the first buffer channel.

[0011] According to a hinge hydraulic cylinder of an embodiment of the present invention, the piston is provided with a cylindrical portion, the cylindrical portion is connected to the abutting portion, the cylindrical portion is located on the inner side of the sealing ring, and an oil guide cavity is formed between the radial outer surface of the cylindrical portion and the inner side of the sealing ring.

[0012] According to a hinge hydraulic cylinder of an embodiment of the present invention, the abutment portion extends in an annular manner along the outer circumference of the cylindrical portion, and the abutment portion is provided with at least one oil drain hole, and the oil drain hole communicates with the oil guide chamber and the compression chamber.

[0013] According to a hinge hydraulic cylinder of an embodiment of the present invention, the sealing ring is a Gly ring.

[0014] According to a hinge hydraulic cylinder of an embodiment of the present invention, the tube body also has a second inner circumferential wall, the second inner circumferential wall and the first inner circumferential wall are arranged along the axial direction of the tube body, the second inner circumferential wall has an oil guide groove, and the oil guide groove cooperates with the radial outer surface of the sealing ring to form a second buffer channel.

[0015] A hinge hydraulic oil cylinder according to an embodiment of the present invention further includes a spring, wherein the spring is located in the tube body and is used to drive the piston to move.

[0016] According to a hinge hydraulic cylinder of an embodiment of the present invention, the piston is provided with a push rod, a Y-shaped ring is provided between the push rod and the tube body, and the push rod is sealed and connected to the tube body through the Y-shaped ring.

[0017] According to a hinge hydraulic cylinder of an embodiment of the present invention, the outer surface of the push rod is slidably connected with a positioning sleeve, the positioning sleeve is located on the side of the piston away from the Y-ring, a positioning edge is provided on the radial outer side of the positioning sleeve, and a positioning groove is provided on the inner wall of the tube body, and the positioning edge cooperates with the positioning groove.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic structural diagram of a push rod pressure buffer of a hinge hydraulic oil cylinder according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic structural diagram of a push rod reset of a hinge hydraulic cylinder is shown; Figure 3 for Figure 1 An exploded view of a hinge hydraulic cylinder is shown; Figure 4 for Figure 1 A schematic structural diagram of a hinge hydraulic cylinder's tube body, piston and oil valve is shown.

[0021] Reference numerals: 100- oil valve, 110- first spiral groove; 200-tube body, 210-first inner peripheral wall, 220-oil discharge channel, 230-oil guide cavity, 240-second inner peripheral wall, 250-oil guide groove, 260-positioning groove; 300-piston, 310-center hole, 320-guide hole, 330-oil drain hole, 340-abutment portion, 350-activity space, 360-cylindrical portion, 370-push rod; 400-reset chamber; 500-compression chamber; 600-sealing ring; 700-spring; 800-Y-ring; 900-positioning sleeve, 910-positioning edge. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0024] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of first and second, this is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation, connection and connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] A hinge hydraulic cylinder according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0027] Reference Figure 1 The present invention aims to provide an embodiment of a hinge hydraulic cylinder.

[0028] A hinge hydraulic cylinder according to an embodiment of the present invention comprises a tube body 200 and a piston 300. The tube body 200 is filled with hydraulic oil and has a first inner circumferential wall 210. The piston 300 is located in the tube body 200 and divides the tube body 200 into a reset chamber 400 and a compression chamber 500. The piston 300 is used to slide between the reset chamber 400 and the compression chamber 500 to generate a buffering force. An oil discharge channel 220 is formed between the radial outer surface of the piston 300 and the first inner circumferential wall 210. The oil discharge channel 220 allows the hydraulic oil to flow from the reset chamber 400 to the compression chamber 500.

[0029] It can be understood that by forming the oil discharge passage 220 between the radial outer surface of the piston 300 and the first inner circumferential wall 210, a larger gap exists between the tube body 200 and the piston 300. The oil discharge passage 220 allows the hydraulic oil to flow from the reset chamber 400 to the compression chamber 500, so that the piston 300 can quickly move close to the reset chamber 400 for reset. At the same time, the matching accuracy between the tube body 200 and the piston 300 is reduced, which can reduce the processing accuracy of the tube body 200 and the piston 300, reduce the manufacturing cost, and also reduce the poor matching between the tube body 200 and the piston 300.

[0030] A hinge hydraulic cylinder according to an embodiment of the present invention further includes a first buffer channel, which is disposed on the piston 300 . The first buffer channel allows hydraulic oil to flow from the compression chamber 500 to the reset chamber 400 .

[0031] It can be understood that by setting up the first buffer channel, when the piston 300 is subjected to external force, the piston 300 moves close to the compression chamber 500, and the first buffer channel allows the hydraulic oil to flow from the compression chamber 500 to the reset chamber 400. The first buffer channel is narrow, and the flow rate of hydraulic oil allowed by the first buffer channel is small, so that the piston 300 moves slowly, thereby enabling the hydraulic cylinder to achieve a buffering function.

[0032] A hinge hydraulic cylinder according to an embodiment of the present invention further includes an abutment portion 340 and a sealing ring 600. The abutment portion 340 is connected to the piston 300. An active space 350 is formed between the abutment portion 340 and the piston 300. The active space 350 has a first position and a second position distributed along the axis of the tube body 200. The radial outer surface of the sealing ring 600 is sealed and abutted against the first inner circumferential wall 210. The sealing ring 600 is located in the active space 350, and the sealing ring 600 can move between the first position and the second position. When the sealing ring 600 is in the first position, the end face of the sealing ring 600 abuts against the piston 300 to cut off the oil discharge channel 220. When the sealing ring 600 is in the second position, the end face of the sealing ring 600 abuts against the abutment portion 340 to release the cut-off of the oil discharge channel 220.

[0033] It can be understood that when the sealing ring 600 is in the movable space 350, the sealing ring 600 can move between the first position and the second position. When the piston 300 moves close to the compression chamber 500, the sealing ring 600 is in the first position, and the end face of the sealing ring 600 abuts against the piston 300. At the same time, the radial outer surface of the sealing ring 600 abuts against the first inner circumferential wall 210, and the oil discharge channel 220 is in a truncated state. The hydraulic oil cannot flow from the compression chamber 500 to the reset chamber 400, ensuring that the hydraulic oil only flows to the reset chamber 400 through the first buffer channel, thereby making the flow of the hydraulic oil stable and avoiding buffer failure of the hydraulic cylinder.

[0034] In some embodiments of the present invention, reference Figure 1 and Figure 3 , and also includes an oil valve 100, which is a cylindrical structure. A first spiral groove 110 is provided on the radial outer surface of the oil valve 100, and the first spiral groove 110 extends around the axis of the oil valve 100. The piston 300 is provided with a center hole 310. The oil valve 100 and the center hole 310 are tightly fitted, and a first buffer channel is formed between the first spiral groove 110 and the inner wall of the center hole 310.

[0035] It can be understood that, by providing the oil valve 100, the oil valve 100 is a cylindrical structure with a regular shape, easy machining and low machining cost.

[0036] Furthermore, by making the oil valve 100 and the center hole 310 have an interference fit, the gap between the oil valve 100 and the inner wall of the center hole 310 is made very small, and it is difficult for the hydraulic oil to pass through the gap between the oil valve 100 and the center hole 310 when the hydraulic cylinder is buffering, thereby ensuring that the hydraulic oil only passes through the first buffer channel and ensuring that the buffering force of the hydraulic cylinder is stable when the piston 300 moves on the first inner circumferential wall 210, and there will be no sudden change in the buffering force.

[0037] Secondly, by providing the first spiral groove 110 on the radial outer surface of the oil valve 100 , it is easier and simpler to process the first spiral groove 110 on the outer circumferential surface of the oil valve 100 .

[0038] Furthermore, by setting the first spiral groove 110, a first buffer channel is formed between the first spiral groove 110 and the inner wall of the center hole 310, which greatly extends the path of the first buffer channel, making the path of the hydraulic oil flowing through the first buffer channel longer, and the width of the first spiral groove 110 can be set narrower, making it easier for the hydraulic cylinder to achieve greater buffering force and longer buffering time. At the same time, a small-volume hydraulic cylinder can also be suitable for working environments with heavier loads.

[0039] It should be noted that in some other designs, the first spiral groove 110 may also be provided in the inner wall of the center hole 310 (not shown in the drawings), and the first spiral groove 110 and the outer cylindrical surface of the oil valve 100 cooperate to form a first buffer channel.

[0040] In a further embodiment of the present invention, the piston 300 is provided with a guide hole 320 , and the guide hole 320 communicates with the oil discharge channel 220 and the first buffer channel.

[0041] It can be understood that the guide hole 320 can be produced by drilling a hole on the outer cylindrical surface of the piston 300 . The guide hole 320 has a simple structure and is easy to process.

[0042] Furthermore, when the hydraulic cylinder is in buffering operation, the hydraulic oil in the compression chamber 500 can enter the reset chamber 400 through the first buffer channel, the guide hole 320 and the oil discharge channel 220 in sequence.

[0043] Preferably, the sealing ring 600 is a Glay ring.

[0044] It should be noted that the Glyd ring is resistant to high pressure and is not easily deformed under the working pressure of the hydraulic oil. In addition, the width of the outer cylindrical surface of the Glyd ring is large, so that the Glyd ring has a good sealing effect, can ensure the stable flow of the hydraulic oil, and avoid failure of the hydraulic cylinder buffer.

[0045] In addition, the Glyd ring has the characteristics of low friction and wear resistance, which makes the Glyd ring less likely to be damaged during long-term sliding work, improves the reliability of the seal, and thus helps to increase the service life of the hydraulic cylinder.

[0046] In some embodiments of the present invention, the piston 300 is provided with a cylindrical portion 360 , which is connected to the abutting portion 340 , and the cylindrical portion 360 is located on the inner side of the sealing ring 600 , and an oil guide cavity 230 is formed between the radial outer surface of the cylindrical portion 360 and the inner side of the sealing ring 600 .

[0047] It is understandable that the piston 300 can be machined to form the cylindrical portion 360 and the abutment portion 340 , so that the piston 300 , the cylindrical portion 360 and the abutment portion 340 are designed as an integrated whole, thereby eliminating the step of installing the abutment portion 340 on the piston 300 .

[0048] Furthermore, the cylindrical portion 360 and the sealing ring 600 can form a larger oil guide chamber 230. When the piston 300 moves close to the reset chamber 400 and resets, the hydraulic oil can quickly flow from the oil discharge channel 220 to the oil guide chamber 230, so that the piston 300 is quickly reset.

[0049] In a further embodiment of the present invention, the abutting portion 340 extends in an annular shape along the outer circumference of the cylindrical portion 360 , and the abutting portion 340 is provided with at least one oil drain hole 330 , and the oil drain hole 330 communicates with the oil guide chamber 230 and the compression chamber 500 .

[0050] It can be understood that by providing the annularly extending abutting portion 340 , the overall processing of the piston 300 is made easier and more convenient.

[0051] By providing the oil drain hole 330 , when the piston 300 moves close to the reset chamber 400 to reset, the hydraulic oil in the oil guide chamber 230 can flow from the oil drain hole 330 into the compression chamber 500 .

[0052] In some embodiments of the present invention, reference Figure 4 The tube body 200 also has a second inner circumferential wall 240, and the second inner circumferential wall 240 and the first inner circumferential wall 210 are arranged along the axial direction of the tube body 200. The second inner circumferential wall 240 has an oil guide groove 250, and the oil guide groove 250 cooperates with the radial outer surface of the sealing ring 600 to form a second buffer channel.

[0053] It can be understood that when the hydraulic cylinder buffer is working, the sealing ring 600 passes through the first inner wall 210 and the second inner wall 240 in turn. When the sealing ring 600 and the first inner wall 210 cooperate, there is no gap between the two, and the hydraulic oil can only pass through the first buffer channel. At this time, the buffer force is very large, and the piston 300 moves slowly. When the sealing ring 600 and the second inner wall 240 cooperate, a second buffer channel is formed between the sealing ring 600 and the oil guide groove 250, which can make the cross-sectional area of ​​the oil guide groove 250 larger, which is beneficial to reduce the buffer force and the piston 300 moves faster. Therefore, the closing speed of doors and windows can be changed from slow to fast, making the doors and windows easier to close.

[0054] It should be noted that the oil guide groove 250 can be a spiral groove structure, which extends around the axis of the tube body 200. In addition, the oil guide groove 250 can also be a straight groove structure. The oil guide groove 250 is designed according to actual usage needs and is not specifically limited here.

[0055] In some embodiments of the present invention, a spring 700 is further included. The spring 700 is located in the tube body 200 and is used to drive the piston 300 to move.

[0056] It can be understood that, under the external force of the hydraulic cylinder, the spring 700 can drive the piston 300 to move closer to the reset chamber 400, which is conducive to quickly resetting the piston 300.

[0057] In some embodiments of the present invention, the piston 300 is provided with a push rod 370 , a Y-shaped ring 800 is provided between the push rod 370 and the tube body 200 , and the push rod 370 is sealedly connected to the tube body 200 via the Y-shaped ring 800 .

[0058] The Y-shaped ring 800 can prevent the hydraulic oil in the tube body 200 from leaking. At the same time, when the Y-shaped ring 800 is installed between the push rod 370 and the tube body 200, it is not easy to flip over and will not get tangled, thus avoiding damage caused by the push rod 370 sliding in the Y-shaped ring 800.

[0059] In a further embodiment of the present invention, referring to Figure 3 and Figure 4 The outer surface of the push rod 370 is slidably connected with a positioning sleeve 900, and the positioning sleeve 900 is located on the side of the piston 300 away from the Y-ring 800. A positioning edge 910 is provided on the radial outer side of the positioning sleeve 900, and a positioning groove 260 is provided on the inner wall of the tube body 200, and the positioning edge 910 cooperates with the positioning groove 260.

[0060] It is understandable that the positioning sleeve 900 is fixed to the tube body 200 by the cooperation between the positioning edge 910 and the positioning groove 260 , and the positioning sleeve 900 can prevent the Y-shaped ring 800 from being separated from the tube body 200 .

[0061] In summary, refer to Figure 1 and Figure 2 The working principle of the hydraulic cylinder of the present invention is as follows: When the push rod 370 is pressed downward, the piston 300 moves close to the compression chamber 500. At the same time, the piston 300 pushes the sealing ring 600 to move downward synchronously. The sealing ring 600 is in the first position, the end face of the sealing ring 600 abuts against the end face of the piston 300, the outer cylindrical surface of the sealing ring 600 abuts against the inner wall of the tube body 200, and the oil discharge channel 220 is in a truncated state. The hydraulic oil in the compression chamber 500 cannot flow to the reset chamber 400 through the oil discharge channel 220, and can only flow to the reset chamber 400 through the first buffer channel, so that the piston 300 moves slowly downward. Then, the outer cylindrical surface of the sealing ring 600 cooperates with the oil guide groove 250 to form a second buffer channel. The second buffer channel allows the hydraulic oil in the compression chamber 500 to flow to the reset chamber 400, so that the piston 300 moves downward faster. Therefore, under the cooperation of the hydraulic cylinder and the hinge, the door and window are smoothly closed.

[0062] When the push rod 370 is not under pressure, the spring 700 drives the piston 300 to move upward. At the same time, the piston 300 pushes the sealing ring 600 to move upward synchronously through the abutment portion 340. The sealing ring 600 is in the second position, the end face of the sealing ring 600 abuts against the abutment portion 340, the outer cylindrical surface of the sealing ring 600 abuts against the inner wall of the tube body 200, the oil discharge channel 220 is in a conducting state, and the hydraulic oil can flow from the reset chamber 400 to the compression chamber 500, thereby resetting the piston 300.

[0063] In the description of this specification, the description with reference to the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A hinge hydraulic cylinder, characterized in that: include: The tube body (200) is filled with hydraulic oil and has a first inner peripheral wall (210); a piston (300), the piston (300) being located in the tube body (200) and dividing the tube body (200) into a reset chamber (400) and a compression chamber (500), the piston (300) being used to slide between the reset chamber (400) and the compression chamber (500) to generate a buffer force, an oil discharge channel (220) being formed between a radial outer surface of the piston (300) and the first inner peripheral wall (210), the oil discharge channel (220) allowing hydraulic oil to flow from the reset chamber (400) to the compression chamber (500); a first buffer channel, disposed on the piston (300), the first buffer channel allowing hydraulic oil to flow from the compression chamber (500) to the reset chamber (400); an abutment portion (340), the abutment portion (340) being connected to the piston (300), an activity space (350) being formed between the abutment portion (340) and the piston (300), the activity space (350) having a first position and a second position distributed along the axis of the tube body (200); A sealing ring (600), wherein the radial outer surface of the sealing ring (600) is in sealing contact with the first inner circumferential wall (210), the sealing ring (600) is located in the movable space (350), and the sealing ring (600) can move between the first position and the second position. When the sealing ring (600) is in the first position, the end surface of the sealing ring (600) is in contact with the piston (300) to cut off the oil discharge passage (220), and when the sealing ring (600) is in the second position, the end surface of the sealing ring (600) is in contact with the abutment portion (340) to release the cut-off of the oil discharge passage (220).

2. A hinge hydraulic cylinder according to claim 1, characterized in that: The oil valve (100) is also included. The oil valve (100) is a cylindrical structure. A first spiral groove (110) is provided on a radial outer surface of the oil valve (100). The first spiral groove (110) extends around the axis of the oil valve (100). The piston (300) is provided with a center hole (310). The oil valve (100) and the center hole (310) are tightly matched. The first buffer channel is formed between the first spiral groove (110) and the inner wall of the center hole (310).

3. A hinge hydraulic cylinder according to claim 2, characterized in that: The piston (300) is provided with a guide hole (320), and the guide hole (320) is connected with the oil discharge channel (220) and the first buffer channel.

4. A hinge hydraulic cylinder according to claim 1, characterized in that: The piston (300) is provided with a cylindrical portion (360), the cylindrical portion (360) is connected to the abutting portion (340), the cylindrical portion (360) is located on the inner side of the sealing ring (600), and an oil guide cavity (230) is formed between the radial outer surface of the cylindrical portion (360) and the inner side of the sealing ring (600).

5. A hinge hydraulic cylinder according to claim 4, characterized in that: The abutment portion (340) extends in an annular shape along the outer circumference of the cylindrical portion (360), and the abutment portion (340) is provided with at least one oil drain hole (330), wherein the oil drain hole (330) communicates with the oil guide chamber (230) and the compression chamber (500).

6. The hinge hydraulic cylinder according to claim 1, characterized in that: The sealing ring (600) is a Gray ring.

7. The hinge hydraulic cylinder according to claim 1, characterized in that: The tube body (200) further comprises a second inner circumferential wall (240), the second inner circumferential wall (240) and the first inner circumferential wall (210) being arranged along the axial direction of the tube body (200), the second inner circumferential wall (240) comprising an oil guide groove (250), the oil guide groove (250) cooperating with the radial outer surface of the sealing ring (600) to form a second buffer channel.

8. The hinge hydraulic cylinder according to claim 1, characterized in that: It also includes a spring (700), wherein the spring (700) is located in the tube body (200), and the spring (700) is used to drive the piston (300) to move.

9. The hinge hydraulic cylinder according to claim 1, characterized in that: The piston (300) is provided with a push rod (370), a Y-shaped ring (800) is provided between the push rod (370) and the tube body (200), and the push rod (370) is sealedly connected to the tube body (200) via the Y-shaped ring (800).

10. The hinge hydraulic cylinder according to claim 9, characterized in that: The outer surface of the push rod (370) is slidably connected with a positioning sleeve (900), and the positioning sleeve (900) is located on the side of the piston (300) away from the Y-ring (800). A positioning edge (910) is provided on the radial outer side of the positioning sleeve (900), and a positioning groove (260) is provided on the inner wall of the tube body (200), and the positioning edge (910) cooperates with the positioning groove (260).

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