Hinge hydraulic oil cylinder

Abstract

The utility model discloses a hinge hydraulic oil cylinder which comprises a pipe body filled with hydraulic oil and provided with a first inner peripheral 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 utility model, 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 utility model relates to the technical field of hydraulic oil cylinder, especially hinge hydraulic oil cylinder. BACKGROUND

[0002] Hydraulic oil cylinder is widely used in various fields, and its main role is to play a buffering role. In the field of doors and windows, the cooperation of hydraulic oil cylinder and hinge can play a buffering function when the door and window are closed, avoiding a large impact when the door and window are closed, thereby protecting the door and window and personnel.

[0003] However, the existing hydraulic oil cylinder requires high cooperation precision of the cylinder body and the piston, which requires high machining precision of the cylinder body and the piston. Due to the size error of the cylinder body and the piston in the machining process, the cylinder body and the piston are prone to poor cooperation. In addition, the internal structure of the hydraulic oil cylinder is relatively complex, the number of parts is relatively large, and the buffering function is prone to failure. UTILITY MODEL CONTENT

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. Therefore, the utility model provides a hinge hydraulic oil cylinder, which can reduce the machining precision of parts, simplify the internal structure, reduce the production cost, and reduce the phenomenon of buffering function failure.

[0005] According to the hinge hydraulic oil cylinder provided by the utility model, the cylinder body is internally filled with hydraulic oil and has a first inner peripheral wall; the piston is located in the cylinder body and separates the cylinder body to form a reset cavity and a compression cavity, and the piston is used for sliding between the reset cavity and the compression cavity to generate a buffering force; an oil discharge channel is formed between the radially outer surface of the piston and the first inner peripheral wall, and the oil discharge channel allows hydraulic oil to flow from the reset cavity to the compression cavity; a first buffering channel is arranged on the piston, and the first buffering channel allows hydraulic oil to flow from the compression cavity to the reset cavity; an abutting portion is connected with the piston, and an active space is formed between the abutting portion and the piston, and the active space has a first position and a second position distributed along the axis of the cylinder body; a sealing ring is in sealing abutment with the radially outer surface of the sealing ring and the first inner peripheral wall, and the sealing ring is located in the active space and can move between the first position and the second position; when the sealing ring is at the first position, the end face of the sealing ring is in abutment with the piston to cut off the oil discharge channel; and when the sealing ring is at the second position, the end face of the sealing ring is in abutment with the abutting portion to remove the cut-off of the oil discharge channel.

[0006] According to the hinge hydraulic oil cylinder provided by the utility model, at least the following beneficial effects are achieved:

[0007] 1. The utility model discloses a piston's radial outer surface and first inner peripheral wall form the oil discharge channel between, and there is the big gap between the pipe body and piston, and the oil discharge channel allows hydraulic oil to flow from the reset chamber to the compression chamber, so that the piston can move quickly and reset close to the reset chamber, simultaneously, the cooperation precision between the pipe body and piston can be reduced, the machining precision of the pipe body and piston can be reduced, the manufacturing cost is reduced, and the adverse effect of the cooperation between the pipe body and piston can be reduced.

[0008] 2. The utility model discloses a first buffer channel is set up, and when the piston is subjected to external force, the piston moves close to the compression chamber, and the first buffer channel allows hydraulic oil to flow from the compression chamber to the reset chamber, the first buffer channel is narrow, and the flow of the hydraulic oil that the first buffer channel allows is smaller, so that the piston moves slowly, thereby, the hydraulic oil cylinder realizes the buffer function.

[0009] 3. The utility model discloses a abutment and sealing ring are set up, make sealing ring in the activity space, sealing ring can move between first position and second position, and when the piston moves close to the compression chamber, sealing ring is at first position, and the end face of sealing ring is in abutment with the piston, simultaneously, the radial outer surface of sealing ring is in abutment with first inner peripheral wall, and the oil discharge channel is in the state of cutting off, and hydraulic oil cannot flow from the compression chamber to the reset chamber, ensure that hydraulic oil only flows to the reset chamber through the first buffer channel, thereby, the hydraulic oil flows stably, avoids the buffer failure of the hydraulic oil cylinder.

[0010] According to the hinge hydraulic oil cylinder provided by the utility model, the oil valve is provided with the first spiral groove, and the first spiral groove is arranged on the radial outer surface of the oil valve and extends around the oil valve axis, the piston is provided with the center hole, the oil valve is tightly arranged with the center hole, and the first buffer channel is formed between the first spiral groove and the inner wall of the center hole.

[0011] According to the hinge hydraulic oil cylinder provided by the utility model, the piston is provided with the guide hole, and the guide hole is communicated with the oil discharge channel and the first buffer channel.

[0012] According to the hinge hydraulic oil cylinder provided by the utility model, the piston is provided with the cylindrical part, the cylindrical part is connected with the abutment, the cylindrical part is located on the inner side of the sealing ring, and the oil guide cavity is formed between the radial outer surface of the cylindrical part and the inner side of the sealing ring.

[0013] According to the hinge hydraulic oil cylinder provided by the utility model, the abutment extends along the outer circumferential ring of the cylindrical part, the abutment is provided with at least one oil discharge hole, and the oil discharge hole is communicated with the oil guide cavity and the compression chamber.

[0014] According to the hinge hydraulic oil cylinder provided by the utility model, the sealing ring is the gasket ring.

[0015] According to the hinge hydraulic oil cylinder, the pipe body further has a second inner peripheral wall, the second inner peripheral wall and the first inner peripheral wall are arranged along the axial direction of the pipe body, the second inner peripheral 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.

[0016] According to the hinge hydraulic oil cylinder, the pipe body further has a second inner peripheral wall, the second inner peripheral wall and the first inner peripheral wall are arranged along the axial direction of the pipe body, the second inner peripheral 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.

[0017] According to the hinge hydraulic oil cylinder, the pipe body further has a second inner peripheral wall, the second inner peripheral wall and the first inner peripheral wall are arranged along the axial direction of the pipe body, the second inner peripheral 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.

[0018] According to the hinge hydraulic oil cylinder, the pipe body further has a second inner peripheral wall, the second inner peripheral wall and the first inner peripheral wall are arranged along the axial direction of the pipe body, the second inner peripheral 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.

[0019] Additional aspects and advantages of the present application will be described in the following description, some of which will be apparent from the following description or will be learned from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The structure diagram of the push rod pressure buffering of the hinge hydraulic oil cylinder according to the embodiment of the present application is shown;

[0022] Figure 2 The structure diagram of the push rod pressure buffering of the hinge hydraulic oil cylinder according to the embodiment of the present application is shown; Figure 1 The structure diagram of the push rod pressure buffering of the hinge hydraulic oil cylinder according to the embodiment of the present application is shown;

[0023] Figure 3 The structure diagram of the push rod pressure buffering of the hinge hydraulic oil cylinder according to the embodiment of the present application is shown; Figure 1 The structure diagram of the push rod pressure buffering of the hinge hydraulic oil cylinder according to the embodiment of the present application is shown;

[0024] Figure 4 The structure diagram of the push rod pressure buffering of the hinge hydraulic oil cylinder according to the embodiment of the present application is shown; Figure 1 The structure diagram of the pipe body, the piston and the oil valve of the hinge hydraulic oil cylinder is shown.

[0025] REFERENCE NUMERALS:

[0026] 100 - oil valve, 110 - first helical groove;

[0027] 200 - tube body, 210 - first inner peripheral wall, 220 - oil discharge passage, 230 - oil guide cavity, 240 - second inner peripheral wall, 250 - oil guide groove, 260 - positioning groove;

[0028] 300 - piston, 310 - center hole, 320 - guide hole, 330 - oil discharge hole, 340 - abutting portion, 350 - active space, 360 - cylindrical portion, 370 - push rod;

[0029] 400 - reset cavity;

[0030] 500 - compression cavity;

[0031] 600 - sealing ring;

[0032] 700 - spring;

[0033] 800 - Y-shaped ring;

[0034] 900 - positioning sleeve, 910 - positioning edge. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0036] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0037] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If there is a description of the first and second, this is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.

[0038] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation, connection and connection" should be understood broadly, for example, it can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirect connection through intermediate medium, can be the communication inside two elements, the above-mentioned term in the utility model can be understood according to specific circumstances by the ordinary skill in the art.

[0039] The hinge hydraulic cylinder according to the embodiments of the utility model is described below with reference to the drawings.

[0040] Referring to Figure 1 The utility model aims at providing an embodiment of hinge hydraulic cylinder.

[0041] The hinge hydraulic cylinder according to the embodiments of the utility model includes a pipe body 200 and a piston 300, the pipe body 200 is filled with hydraulic oil inside, and has a first inner peripheral wall 210; the piston 300 is located in the pipe body 200 and separates the pipe body 200 to form a reset cavity 400 and a compression cavity 500, the piston 300 is used to slide between the reset cavity 400 and the compression cavity 500 to generate a buffer force, an oil discharge channel 220 is formed between the radial outer surface of the piston 300 and the first inner peripheral wall 210, and the oil discharge channel 220 allows the hydraulic oil to flow from the reset cavity 400 to the compression cavity 500.

[0042] It can be understood that, by forming the oil discharge channel 220 between the radial outer surface of the piston 300 and the first inner peripheral wall 210, there is a large gap between the pipe body 200 and the piston 300, the oil discharge channel 220 allows the hydraulic oil to flow from the reset cavity 400 to the compression cavity 500, so that the piston 300 can quickly move close to the reset cavity 400 for resetting, at the same time, the matching precision between the pipe body 200 and the piston 300 is reduced, the machining precision of the pipe body 200 and the piston 300 can be reduced, the manufacturing cost is reduced, and the malfunctions in the matching of the pipe body 200 and the piston 300 can be reduced.

[0043] The hinge hydraulic cylinder according to the embodiments of the utility model further includes a first buffer channel, the first buffer channel is arranged on the piston 300, and the first buffer channel allows the hydraulic oil to flow from the compression cavity 500 to the reset cavity 400.

[0044] It can be understood that, by arranging the first buffer channel, when the piston 300 is subjected to an external force, the piston 300 moves close to the compression cavity 500, the first buffer channel allows the hydraulic oil to flow from the compression cavity 500 to the reset cavity 400, the first buffer channel is narrow, the flow of the hydraulic oil allowed to pass through the first buffer channel is small, so that the piston 300 moves slowly, thereby enabling the hydraulic cylinder to realize the buffer function.

[0045] The utility model discloses an embodiment of a hinge hydraulic oil cylinder further includes abutment portion 340 and sealing ring 600, and abutment portion 340 is connected with piston 300, and the active space 350 is formed between abutment portion 340 and piston 300, and the active space 350 has the first position and the second position along the axis distribution of pipe body 200, the radial outer surface of sealing ring 600 and first inner periphery wall 210 seal abutment, and sealing ring 600 is located in the active space 350, and sealing ring 600 can move between the first position and the second position, when sealing ring 600 is in the first position, the end surface of sealing ring 600 abuts with piston 300 to cut off oil discharge channel 220, when sealing ring 600 is in the second position, the end surface of sealing ring 600 abuts with abutment portion 340 to remove the cutting off oil discharge channel 220.

[0046] It can be understood that sealing ring 600 is in the active space 350, and sealing ring 600 can move between the first position and the second position, when piston 300 moves close to compression cavity 500, sealing ring 600 is in the first position, the end surface of sealing ring 600 abuts with piston 300, at the same time, the radial outer surface of sealing ring 600 abuts with first inner periphery wall 210, and oil discharge channel 220 is in the state of cutting off, and hydraulic oil cannot flow from compression cavity 500 to reset cavity 400, ensuring that hydraulic oil only flows to reset cavity 400 through the first buffer channel, so that the flow of hydraulic oil is stable, and the buffer failure of the hydraulic oil cylinder is avoided.

[0047] In some embodiments of the utility model, refer to Figure 1 And Figure 3 Further include oil valve 100, and oil valve 100 is cylindrical structure, and the radial outer surface of oil valve 100 is provided with first spiral groove 110, and first spiral groove 110 extends around the oil valve 100 axis, and piston 300 is provided with center hole 310, and oil valve 100 and center hole 310 are tightly fitted, and first buffer channel is formed between first spiral groove 110 and the inner wall of center hole 310.

[0048] It can be understood that by setting oil valve 100, oil valve 100 is cylindrical structure, and its shape is regular, and machining is easy, and the processing cost is low.

[0049] And, by making oil valve 100 and center hole 310 interference fit, the gap between oil valve 100 and the inner wall of center hole 310 is very small, and hydraulic oil is difficult to pass through the gap between oil valve 100 and center hole 310 when the hydraulic oil cylinder is buffered, ensuring that hydraulic oil only passes through the first buffer channel, and ensuring that the buffer force of the hydraulic oil cylinder is stable when piston 300 moves on first inner periphery wall 210, and the buffer force mutation does not occur.

[0050] Secondly, by setting the first spiral groove 110 on the radial outer surface of the oil valve 100, the first spiral groove 110 is easier and simpler to process on the outer circular surface of the oil valve 100.

[0051] Furthermore, by setting the first spiral groove 110, the first buffer channel is formed between the first spiral groove 110 and the inner wall of the center hole 310, which greatly prolongs the path of the first buffer channel, so that the hydraulic oil flows through the path of the first buffer channel is longer, and the width of the first spiral groove 110 can be set more narrow, so that the hydraulic cylinder is more easily realized greater buffer force and longer buffer time, while the small volume of the hydraulic cylinder can also be suitable for the working environment of the heavier load.

[0052] It should be noted that in some other design schemes, the first spiral groove 110 can also be arranged in the inner wall of the center hole 310 (not shown in the drawing), and the first spiral groove 110 and the outer circular surface of the oil valve 100 cooperate to form the first buffer channel.

[0053] In a further embodiment of the present application, the piston 300 is provided with a guide hole 320, and the guide hole 320 communicates the oil discharge channel 220 and the first buffer channel.

[0054] It can be understood that the guide hole 320 can be drilled on the outer circular surface of the piston 300, and the guide hole 320 has a simple structure and is easy to process.

[0055] Furthermore, when the hydraulic cylinder is buffering, 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 turn.

[0056] Preferably, the sealing ring 600 is a Glay ring.

[0057] It should be noted that the Glay ring has the characteristics of high pressure resistance, and is not easy to deform under the working pressure of the hydraulic oil, and the width size of the outer circular surface of the Glay ring is large, so that the sealing effect of the Glay ring is good, which can ensure the stable flow of the hydraulic oil and avoid the buffering failure of the hydraulic cylinder.

[0058] In addition, the Glay ring also has the characteristics of small friction and wear resistance, so that the Glay ring is not easy to be damaged in long-term sliding work, and the reliability of the sealing is improved, thereby, the service life of the hydraulic cylinder is improved.

[0059] In some embodiments of the present application, 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 the oil guide cavity 230 is between the radial outer surface of the cylindrical portion 360 and the inner side of the sealing ring 600.

[0060] It can be understood that the cylindrical portion 360 and the abutting portion 340 can be machined by machining, so that the piston 300, the cylindrical portion 360 and the abutting portion 340 are designed as a whole, and the step of installing the abutting portion 340 on the piston 300 is omitted.

[0061] Moreover, the cylindrical portion 360 and the sealing ring 600 can form a large-volume oil guide cavity 230, and when the piston 300 moves to reset close to the reset cavity 400, hydraulic oil can quickly flow from the oil discharge channel 220 to the oil guide cavity 230, so that the piston 300 quickly resets.

[0062] In further embodiments of the utility model, the abutting portion 340 extends annularly along the outer periphery of the cylindrical portion 360, and the abutting portion 340 is provided with at least one oil discharge hole 330, which communicates the oil guide cavity 230 and the compression cavity 500.

[0063] It can be understood that by arranging the annularly extending abutting portion 340, the overall machining of the piston 300 is easier and more convenient.

[0064] By arranging the oil discharge hole 330, when the piston 300 moves to reset close to the reset cavity 400, the hydraulic oil in the oil guide cavity 230 can flow into the compression cavity 500 from the oil discharge hole 330.

[0065] In some embodiments of the utility model, with reference to Figure 4 , the pipe body 200 further has a second inner peripheral wall 240, which is arranged along the axial direction of the pipe body 200, and the second inner peripheral wall 240 has an oil guide groove 250, which cooperates with the radially outer surface of the sealing ring 600 to form a second buffer channel.

[0066] It can be understood that when the hydraulic cylinder buffer works, the sealing ring 600 passes through the first inner peripheral wall 210 and the second inner peripheral wall 240 in turn, and when the sealing ring 600 cooperates with the first inner peripheral wall 210, there is no gap between them, and the hydraulic oil can only pass through the first buffer channel, at this time, the buffer force is large, and the piston 300 moves slowly, and when the sealing ring 600 cooperates with the second inner peripheral wall 240, the 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 conducive to making the buffer force smaller and the piston 300 moving faster, so that the closing speed of the door and window can change from slow to fast, and the door and window can be closed more easily.

[0067] It should be noted that the oil guide groove 250 can be in the form of a spiral groove extending around the axis of the pipe body 200, and in addition, the oil guide groove 250 can also be in the form of a straight groove. The oil guide groove 250 is designed according to the actual needs, and is not specifically limited here.

[0068] In some embodiments of the utility model, still include spring 700, spring 700 is located in the pipe body 200, spring 700 is used to drive piston 300 moves.

[0069] It can be understood that under the action of external force of hydraulic oil cylinder, spring 700 can drive piston 300 to move close to reset cavity 400, which is conducive to the rapid reset of piston 300.

[0070] In some embodiments of the utility model, piston 300 is provided with push rod 370, Y-shaped ring 800 is arranged between push rod 370 and pipe body 200, and push rod 370 is sealingly connected with pipe body 200 through Y-shaped ring 800.

[0071] Y-shaped ring 800 can avoid the leakage of hydraulic oil in pipe body 200, and when Y-shaped ring 800 is installed between push rod 370 and pipe body 200, it is not easy to turn itself and will not appear the phenomenon of self-kinking, avoiding the damage caused by the sliding of push rod 370 in Y-shaped ring 800.

[0072] In further embodiments of the utility model, referring to Figure 3 and Figure 4 , the outer surface of push rod 370 is slidingly connected with positioning sleeve 900, positioning sleeve 900 is located on the side of piston 300 away from Y-shaped ring 800, the radial outer side of positioning sleeve 900 is provided with positioning edge 910, the inner wall of pipe body 200 is provided with positioning groove 260, and positioning edge 910 cooperates with positioning groove 260.

[0073] It can be understood that the cooperation of positioning edge 910 and positioning groove 260 makes positioning sleeve 900 fixed on pipe body 200, and positioning sleeve 900 can prevent Y-shaped ring 800 from separating from pipe body 200.

[0074] In summary, referring to Figure 1 and Figure 2 , the working principle of the hydraulic oil cylinder of the utility model is as follows:

[0075] When the push rod 370 is pressed and pushed down, the piston 300 moves close to the compression cavity 500, and at the same time, the piston 300 pushes the sealing ring 600 to move down 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 circular surface of the sealing ring 600 abuts against the inner side wall of the pipe body 200, the oil discharge channel 220 is in a cut-off state, the hydraulic oil in the compression cavity 500 cannot flow to the reset cavity 400 through the oil discharge channel 220, but can only flow to the reset cavity 400 through the first buffer channel, so that the piston 300 slowly moves down, then the outer circular surface of the sealing ring 600 cooperates with the oil guide groove 250 to form the second buffer channel, the second buffer channel allows the hydraulic oil in the compression cavity 500 to flow to the reset cavity 400, so that the piston 300 moves down at a faster speed, so that the hydraulic oil cylinder and the hinge cooperate to make the door and window close smoothly.

[0076] When the push rod 370 is not pressed, the spring 700 drives the piston 300 to move up, at the same time, the piston 300 pushes the sealing ring 600 to move up synchronously through the abutting portion 340, the sealing ring 600 is in the second position, the end face of the sealing ring 600 abuts against the abutting portion 340, the outer circular surface of the sealing ring 600 abuts against the inner side wall of the pipe body 200, the oil discharge channel 220 is in a conductive state, the hydraulic oil can flow from the reset cavity 400 to the compression cavity 500, so that the piston 300 resets.

[0077] In the description of the present application, the description of the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples, or some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner without departing from the purpose of the present application.

[0078] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge range of ordinary skilled persons in the art without departing from the purpose of the present application.

Claims

1. A hinge hydraulic cylinder, characterized by, The application relates to a shock absorber, which comprises: a pipe body (200) filled with hydraulic oil and provided with a first inner peripheral wall (210); a piston (300) arranged in the pipe body (200) and separating the pipe body (200) into a reset chamber (400) and a compression chamber (500), the piston (300) being used for sliding between the reset chamber (400) and the compression chamber (500) to generate a buffering force, an oil discharge channel (220) being formed between a radial outer surface of the piston (300) and the first inner peripheral wall (210) and allowing hydraulic oil to flow from the reset chamber (400) to the compression chamber (500); a first buffering channel arranged in the piston (300) and allowing hydraulic oil to flow from the compression chamber (500) to the reset chamber (400); an abutting part (340) connected with the piston (300) and having an active space (350) formed between the abutting part (340) and the piston (300), the active space (350) having a first position and a second position distributed along an axis of the pipe body (200); a sealing ring (600) having a radial outer surface sealed against the first inner peripheral wall (210), the sealing ring (600) being arranged in the active space (350) and movable between the first position and the second position, an end surface of the sealing ring (600) abutting against the piston (300) to cut off the oil discharge channel (220) when the sealing ring (600) is in the first position, and the end surface of the sealing ring (600) abutting against the abutting part (340) to uncut off the oil discharge channel (220) when the sealing ring (600) is in the second position.

2. The hinge hydraulic ram as claimed in claim 1, wherein, The shock absorber further comprises an oil valve (100) in a cylindrical structure, a first spiral groove (110) being arranged on a radial outer surface of the oil valve (100) and extending around an axis of the oil valve (100), the piston (300) being provided with a central hole (310), the oil valve (100) and the central hole (310) being tightly arranged, and the first buffering channel being formed between the first spiral groove (110) and an inner wall of the central hole (310).

3. The hinge hydraulic ram as claimed in claim 2, wherein, The piston (300) is provided with a guide hole (320) communicating the oil discharge channel (220) and the first buffering channel.

4. The hinge hydraulic ram of claim 1 wherein, The piston (300) is provided with a cylindrical part (360) connected with the abutting part (340), the cylindrical part (360) being arranged on an inner side of the sealing ring (600), and a guide oil cavity (230) being formed between a radial outer surface of the cylindrical part (360) and the inner side of the sealing ring (600).

5. The hinge hydraulic ram as claimed in claim 4, wherein, The abutting part (340) extends along the outer periphery of the cylindrical part (360), and is provided with at least one oil discharge hole (330) communicating the oil guide cavity (230) and the compression cavity (500).

6. The hinge hydraulic ram of claim 1 wherein, The sealing ring (600) is a Glay ring.

7. The hinge hydraulic ram as claimed in claim 1, wherein, The pipe body (200) further has a second inner peripheral wall (240) arranged along the axial direction of the pipe body (200) and the first inner peripheral wall (210), and the second inner peripheral wall (240) has an oil guide groove (250) cooperating with the radially outer surface of the sealing ring (600) to form a second buffer channel.

8. The hinge hydraulic ram of claim 1 wherein, Further included is a spring (700) located in the pipe body (200) and used to drive the movement of the piston (300).

9. The hinge hydraulic ram of claim 1 wherein, The piston (300) is provided with a push rod (370), and a Y-shaped ring (800) is arranged between the push rod (370) and the pipe body (200), and the push rod (370) is in sealed connection with the pipe body (200) through the Y-shaped ring (800).

10. The hinge hydraulic ram of claim 9, wherein, The outer surface of the push rod (370) is slidably connected with a positioning sleeve (900), the positioning sleeve (900) is located on the side of the piston (300) away from the Y-shaped ring (800), the radially outer side of the positioning sleeve (900) is provided with a positioning rib (910), the inner wall of the pipe body (200) is provided with a positioning groove (260), and the positioning rib (910) cooperates with the positioning groove (260).

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