Small-shaft oil hydraulic cylinder hinge

Abstract

The small-shaft oil hydraulic cylinder hinge comprises a shaft core, the shaft core comprises a barrel body and a barrel sleeve which are coaxially arranged in a rotating mode, the barrel body is sleeved with the barrel sleeve, the barrel body is connected with a first hinge piece, and the barrel sleeve is connected with a second hinge piece; the transmission part is arranged between the cylinder body and the cylinder sleeve in a sliding manner; the driving pin is coaxially arranged in the cylinder body, and the driving pin can be arranged in a sliding mode in the axis direction of the cylinder body; the first spring is used for driving the driving pin to slide; the buffering mechanism comprises an oil cavity, a piston rod, a sealing ring and a first buffering channel, the oil cavity is located in the cylinder body, the piston rod is arranged in the oil cavity in a sliding mode and divides the oil cavity into a first oil chamber and a second oil chamber, the radial outer surface of the sealing ring abuts against the oil cavity in a sealed mode, and the first buffering channel is arranged on the piston rod. The hinge has the advantages that the shaft diameter of the shaft core is small, the buffering mechanism is not prone to oil leakage and failure during buffering, effective buffering is guaranteed, and the service life of the hinge is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of hinges, and in particular to a small shaft hydraulic cylinder hinge. Background Technology

[0002] Hinges are commonly used in the door and window industry. Some hinges on the market have a closing buffer function. The hinge is equipped with a damper or hydraulic cylinder inside. The main function of the damper and hydraulic cylinder is to provide a buffer.

[0003] However, existing hinges have large shaft diameters and large volumes. Furthermore, the dampers or hydraulic cylinders are prone to oil leakage and failure, causing the hinges to lose their buffering function and resulting in a short service life. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a small-shaft hydraulic cylinder hinge, characterized by a small shaft diameter, and the buffering mechanism is less prone to oil leakage failure during buffering, ensuring effective buffering and improving the hinge's service life.

[0005] A small-shaft hydraulic cylinder hinge according to an embodiment of the present invention includes: a shaft core, the shaft core including a cylindrical body and a sleeve coaxially rotatably disposed, the sleeve being fitted onto the cylindrical body, the cylindrical body being connected to a first leaf blade, and the sleeve being connected to a second leaf blade; a transmission member, the transmission member being slidably disposed between the cylindrical body and the sleeve; a drive pin, the drive pin being coaxially disposed inside the cylindrical body, the drive pin being slidably disposed along the axial direction of the cylindrical body, and the end of the drive pin abutting against the transmission member; a first spring, the first spring being located inside the cylindrical body, the first spring being used to drive the drive pin to slide; and a buffer mechanism, the buffer mechanism being disposed on the side of the transmission member away from the drive pin, for slowing down the sliding speed of the drive pin. The structure includes an oil chamber, a piston rod, a sealing ring, and a first buffer channel. The oil chamber is located inside the cylinder, and the piston rod is slidably disposed within the oil chamber, dividing the oil chamber into a first oil chamber and a second oil chamber. The radial outer surface of the sealing ring seals against the oil chamber. The first buffer channel is disposed on the piston rod. A first oil passage is formed between the radial outer surface of the piston rod and the inner wall of the oil chamber, which connects the first oil chamber and the second oil chamber. The radial outer surface of the piston rod has a movable space, and the sealing ring is located within the movable space and can move axially along the piston rod. During buffering, the sealing ring cuts off the first oil passage, and the hydraulic oil in the first oil chamber enters the second oil chamber through the first buffer channel.

[0006] A small shaft hydraulic cylinder hinge according to an embodiment of the present utility model has at least the following beneficial effects:

[0007] 1. This utility model, by setting a shaft core, a transmission component, a drive pin, and a first spring, allows the cylindrical body and sleeve of the shaft core to rotate relative to each other, enabling the transmission component to slide between the cylindrical body and sleeve. This allows the transmission component to rotate and move along the axial direction of the shaft core. When the door or window is opened, the first and second leaf blades open relative to each other, and the relative rotation of the cylindrical body and sleeve causes the transmission component to abut against the drive pin. The drive pin moves and compresses the first spring. When the door or window is closed, under the elastic force of the first spring, the drive pin drives the transmission component to move, causing the cylindrical body and sleeve to rotate relative to each other, and the first and second leaf blades close relative to each other, thus achieving automatic closing of the door or window. Therefore, the diameter of the drive pin is small, and the shaft core diameter of this hinge structure is small, resulting in a small hinge volume, making it suitable for a wide range of door and window sizes.

[0008] 2. This utility model, by setting up an oil chamber, piston rod, sealing ring, and first buffer channel, with the first and second flaps relatively closed, the transmission component abutting against the piston rod, the piston rod gradually extending into the oil chamber, the piston rod driving the sealing ring to move closer to the first oil chamber, the end face of the sealing ring and the piston rod cooperating to cut off the first oil passage, making the first oil passage unable to conduct. At the same time, the hydraulic oil in the first oil chamber enters the second oil chamber through the first buffer channel. The cross-section of the first buffer channel is small, and the flow rate of hydraulic oil through the first buffer channel is small, making the hydraulic oil flow stable and ensuring the buffer mechanism's buffering stability. The first and second flaps relatively open, the piston rod gradually extends from inside the oil chamber, the piston rod driving the sealing ring to move closer to the second oil chamber. At this time, the first oil passage is in a conducting state, and the hydraulic oil in the second oil chamber enters the first oil chamber through the first oil passage and the moving space, causing the piston rod to reset. Thus, the hydraulic oil flow of the buffer mechanism of this structure is stable, avoiding buffering failure and improving the service life of the hinge.

[0009] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge further includes an oil valve, the oil valve having a cylindrical structure, a first spiral groove being provided on the radial outer surface of the oil valve, a mounting hole being provided on the piston rod, the oil valve and the mounting hole being tightly fitted together, and a first buffer channel being formed between the first spiral groove and the inner wall of the mounting hole.

[0010] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge has an oil guide groove on the inner wall of the oil chamber, and the oil guide groove cooperates with the radial outer surface of the sealing ring to form a second buffer channel.

[0011] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge includes a buffer mechanism that further includes a second spring located within the oil chamber, the second spring being used to drive the piston to move.

[0012] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge includes a buffer mechanism that further includes a tube body, the oil cavity of which is formed inside the tube body.

[0013] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge is provided with a pusher, and a Y-ring is provided between the pusher and the oil chamber. The pusher is sealed to the tube body through the Y-ring.

[0014] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge is provided with a spiral track in the cylinder body and a straight track in the sleeve, and the transmission component can slide along the spiral track and the straight track.

[0015] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge includes a first cylinder and a second cylinder connected by threads, and an annular groove is formed between the first cylinder and the second cylinder, the annular groove accommodating the sleeve.

[0016] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge has a first adjusting screw threadedly connected to the inner wall of the cylinder, the first adjusting screw being used to adjust the elastic force of the first spring.

[0017] According to an embodiment of the present invention, a small shaft hydraulic cylinder hinge has a second adjusting screw threadedly connected to the inner wall of the oil chamber, the second adjusting screw being used to adjust the elastic force of the second spring.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a small shaft hydraulic cylinder hinge according to an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 An exploded view of a small shaft hydraulic cylinder hinge is shown.

[0022] Figure 3 This is a schematic diagram of the structure of a small shaft hydraulic cylinder hinge according to another embodiment of the present invention;

[0023] Figure 4 for Figure 3 The diagram shows a schematic of the buffer mechanism of a small shaft hydraulic cylinder hinge.

[0024] Reference numerals: 100-Cylinder body, 110-Sleeve, 120-First leaf blade, 130-Second leaf blade, 140-Drive pin, 150-First spring, 160-Spiral channel, 170-Straight channel, 180-Push-in, 190-First adjusting screw, 200-Second adjusting screw, 210-First cylinder, 220-Second cylinder, 230-Oil chamber, 240-Piston rod, 250-Sealing ring, 260-First buffer channel, 270-First oil chamber, 280-Second oil chamber, 290-First oil passage, 300-Moving space, 310-First spiral groove, 320-Oil guide groove, 330-Oil valve, 340-Second spring, 350-Pipe body, 360-Y-ring, 370-Transmission component. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" and "second" are mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation, connection, and linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The following description, in conjunction with the accompanying drawings, describes a small shaft hydraulic cylinder hinge according to an embodiment of the present invention.

[0030] Reference Figure 1 The present invention aims to provide an embodiment of a small shaft hydraulic cylinder hinge.

[0031] This utility model provides a small shaft hydraulic cylinder hinge, referring to... Figure 1 and Figure 2 The device includes a shaft core, a transmission component 370, a drive pin 140, and a first spring 150. The shaft core includes a cylindrical body 100 and a sleeve 110 coaxially rotatably arranged. The sleeve 110 is fitted onto the cylindrical body 100. A first leaf 120 is connected to the cylindrical body 100, and a second leaf 130 is connected to the sleeve 110. The transmission component 370 is slidably disposed between the cylindrical body 100 and the sleeve 110. The drive pin 140 is coaxially disposed inside the cylindrical body 100 and can slide along the axial direction of the cylindrical body 100. The end of the drive pin 140 abuts against the transmission component 370. The first spring 150 is located inside the cylindrical body 100 and is used to drive the drive pin 140 to slide.

[0032] It is understood that, by setting up a shaft core, a transmission component 370, a drive pin 140, and a first spring 150, the cylindrical body 100 and the sleeve 110 of the shaft core can rotate relative to each other, allowing the transmission component 370 to slide between the cylindrical body 100 and the sleeve 110. This causes the transmission component 370 to rotate and move along the axial direction of the shaft core. When the door or window is opened, the first leaf 120 and the second leaf 130 open relative to each other, and the relative rotation of the cylindrical body 100 and the sleeve 110 causes the transmission component 370 to rotate. When the drive pin 140 abuts against the first spring 150, the drive pin 140 moves to compress the first spring 150. When the door and window are closed, under the elastic force of the first spring 150, the drive pin 140 drives the transmission component 370 to move, causing the cylinder 100 and the sleeve 110 to rotate relative to each other. The first leaf 120 and the second leaf 130 close relative to each other, realizing automatic closing of the door and window. As a result, the diameter of the drive pin 140 is small, and the shaft diameter of the hinge of this structure is small, making the hinge smaller in size and suitable for a wide range of door and window sizes.

[0033] A small shaft hydraulic cylinder hinge according to an embodiment of this utility model, refer to... Figure 1 and Figure 4It also includes a buffer mechanism, which is located on the side of the transmission member 370 away from the drive pin 140, to reduce the sliding speed of the drive pin 140. The buffer mechanism includes an oil chamber 230, a piston rod 240, a sealing ring 250, and a first buffer channel 260. The oil chamber 230 is located inside the cylinder 100, and the piston rod 240 is slidably disposed within the oil chamber 230, dividing the oil chamber 230 into a first oil chamber 270 and a second oil chamber 280. The radial outer surface of the sealing ring 250 seals against the oil chamber 230. The first buffer channel 260... A first oil passage 290 is formed between the radial outer surface of the piston rod 240 and the inner wall of the oil chamber 230. The first oil passage 290 is used to connect the first oil chamber 270 and the second oil chamber 280. The radial outer surface of the piston rod 240 is provided with a movable space 300. The sealing ring 250 is located in the movable space 300 and can move along the axial direction of the piston rod 240. During buffering, the sealing ring 250 cuts off the first oil passage 290, and the hydraulic oil in the first oil chamber 270 enters the second oil chamber 280 through the first buffer channel.

[0034] It is understood that this utility model, by setting up an oil chamber 230, a piston rod 240, a sealing ring 250, and a first buffer channel 260, with the first leaf plate 120 and the second leaf plate 130 relatively closed, and the transmission component 370 abutting against the piston rod 240, allows the piston rod 240 to gradually extend into the oil chamber 230. The piston rod 240 drives the sealing ring 250 to move closer to the first oil chamber 270. The end face of the sealing ring 250 and the piston rod 240 cooperate to cut off the first oil passage 290, making the first oil passage 290 unable to conduct. At the same time, the hydraulic oil in the first oil chamber 270 enters the second oil chamber 280 through the first buffer channel 260. The cross-section of the first buffer channel 260... The hydraulic oil flow rate through the first buffer channel 260 is small, ensuring stable hydraulic oil flow and stable buffering mechanism. The first leaf 120 and the second leaf 130 open relative to each other, and the piston rod 240 gradually extends from inside the oil chamber 230. The piston rod 240 drives the sealing ring 250 to move closer to the second oil chamber 280. At this time, the first oil passage 290 is in a conductive state, and the hydraulic oil in the second oil chamber 280 enters the first oil chamber 270 through the first oil passage 290 and the moving space 300, causing the piston rod 240 to reset. Thus, the hydraulic oil flow of the buffering mechanism of this structure is stable, avoiding buffering mechanism failure and improving the service life of the hinge.

[0035] In some embodiments of this utility model, the piston rod 240 is provided with a through hole, which connects the movable space 300 and the first oil chamber 270. When the piston rod 240 is reset, it is beneficial for the hydraulic oil in the movable space 300 to enter the first oil chamber 270 through the through hole.

[0036] In some embodiments of this utility model, an oil valve 330 is also included. The oil valve 330 has a cylindrical structure. A first spiral groove 310 is provided on the radial outer surface of the oil valve 330. The piston rod 240 is provided with a mounting hole. The oil valve 330 and the mounting hole are tightly connected. A first buffer channel is formed between the first spiral groove 310 and the inner wall of the mounting hole.

[0037] It is understandable that by setting the oil valve 330 to make the oil valve 330 and the mounting hole interference fit, the gap between the oil valve 330 and the inner wall of the mounting hole is very small. When the buffer mechanism buffers, the hydraulic oil is difficult to pass through the gap between the oil valve 330 and the mounting hole, ensuring that the hydraulic oil only passes through the first buffer channel 260, ensuring that the buffering force of the buffer mechanism is stable during buffering and that there will be no sudden change in the buffering force.

[0038] In some embodiments of this utility model, the inner wall of the oil cavity 230 is provided with an oil guide groove 320, which cooperates with the radial outer surface of the sealing ring 250 to form a second buffer channel.

[0039] Understandably, when the piston rod 240 passes through the oil guide groove 320, the oil guide groove 320 and the seal cooperate to form a second buffer channel. The cross-sectional area of ​​the oil guide groove 320 is larger, and the hydraulic oil in the first oil chamber 270 can enter the second oil chamber 280 through the second buffer channel, which helps to reduce the buffering force and make the piston rod 240 move faster. As a result, the closing speed of the door and window can be changed from slow to fast, making the door and window easier to close.

[0040] It should be noted that the oil guide groove 320 can be a spiral groove structure, with the spiral groove extending around the inner wall of the oil cavity 230. In addition, the oil guide groove 320 can also be a straight groove structure. The oil guide groove 320 is designed according to actual use needs, and no specific limitation is made here.

[0041] In some embodiments of this utility model, the buffer mechanism further includes a second spring 340, which is located in the oil chamber 230 and is used to drive the piston to move.

[0042] Understandably, the second spring 340 can drive the piston rod 240 to move closer to the second oil chamber 280, which helps the piston rod 240 to quickly return to its original position.

[0043] In some embodiments of this utility model, reference is made to Figure 3 The buffer mechanism also includes a tube 350, with an oil cavity 230 formed inside the tube 350. Therefore, the buffer mechanism is made into a whole by using the tube 350, and the entire buffer mechanism is installed inside the cylinder 100 to meet the installation requirements.

[0044] In some embodiments of this utility model, the piston rod 240 is provided with a pusher 180, and a Y-ring 360 is provided between the pusher 180 and the oil chamber 230. The pusher 180 is sealed to the tube body 350 through the Y-ring 360.

[0045] When the Y-ring 360 is installed between the pusher 180 and the inner wall of the oil cavity 230, it is not easy for it to flip over and will not kink itself, thus avoiding damage caused by the pusher 180 sliding inside the Y-ring 360.

[0046] In some embodiments of this utility model, the cylinder 100 is provided with a spiral channel 160, the sleeve 110 is provided with a straight channel 170, and the transmission component 370 can slide along the spiral channel 160 and the straight channel 170.

[0047] Specifically, the spiral channel 160 extends spirally around the axis of the cylinder 100, the straight channel 170 extends along the axis of the sleeve 110, and the transmission component 370 is a sliding pin, which is inserted between the spiral channel 160 and the straight channel 170.

[0048] Understandably, when the cylinder 100 and the sleeve 110 rotate relative to each other, the transmission component 370 can move along the straight path 170 of the sleeve 110 and rotate along the spiral path 160, so that the transmission component 370 can abut against the drive pin 140 and the piston rod 240.

[0049] In some embodiments of this utility model, the cylinder 100 includes a first cylinder 210 and a second cylinder 220 connected by threads, and an annular groove is formed between the first cylinder 210 and the second cylinder 220 to accommodate the sleeve 110.

[0050] Understandably, the cylinder 100 is composed of a first cylinder 210 and a second cylinder 220, which reduces the manufacturing difficulty of the cylinder 100. Furthermore, installing the sleeve 110 on the annular groove helps to reduce the diameter of the shaft core, thereby making the hinge shaft diameter smaller and enabling the hinge to be used in a wider range of door and window series.

[0051] In some embodiments of this utility model, the inner wall of the cylinder 100 is threaded with a first adjusting screw 190, which is used to adjust the elastic force of the first spring 150.

[0052] Therefore, depending on the needs of use, the position of the first adjusting screw 190 in the cylinder 100 can be adjusted, thereby changing the elastic force of the first spring 150, which can change the closing speed of the door and window to achieve the most ideal closing effect.

[0053] In some embodiments of this utility model, the inner wall of the oil cavity 230 is threaded with a second adjusting screw 200, which is used to adjust the elastic force of the second spring 340.

[0054] Therefore, the position of the second adjusting screw 200 in the oil chamber 230 can be adjusted according to the needs of use, thereby changing the buffering force of the buffer mechanism, realizing the control of various speed changes, and achieving the most ideal door closing buffering effect.

[0055] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A small shaft hydraulic cylinder hinge, characterized in that, include: The shaft core includes a cylindrical body (100) and a sleeve (110) that are coaxially rotatable. The sleeve (110) is fitted onto the cylindrical body (100). The cylindrical body (100) is connected to a first leaf (120), and the sleeve (110) is connected to a second leaf (130). A transmission component (370) is slidably disposed between the cylinder (100) and the sleeve (110); A drive pin (140) is coaxially disposed inside the cylinder (100). The drive pin (140) can slide along the axial direction of the cylinder (100). The end of the drive pin (140) abuts against the transmission member (370). A first spring (150) is located inside the cylinder (100) and is used to drive the drive pin (140) to slide. A buffer mechanism is provided on the side of the transmission member (370) away from the drive pin (140) to reduce the sliding speed of the drive pin (140). The buffer mechanism includes an oil chamber (230), a piston rod (240), a sealing ring (250), and a first buffer channel (260). The oil chamber (230) is located inside the cylinder (100). The piston rod (240) is slidably disposed in the oil chamber (230) and divides the oil chamber (230) into a first oil chamber (270) and a second oil chamber (280). The radial outer surface of the sealing ring (250) is in sealing contact with the oil chamber (230). The first buffer channel (260) is disposed on the piston rod (240). A first oil passage (290) is formed between the radial outer surface of the piston rod (240) and the inner wall of the oil chamber (230). The first oil passage (290) is used to connect the first oil chamber (270) and the second oil chamber (280). The radial outer surface of the piston rod (240) is provided with a movable space (300). The sealing ring (250) is located in the movable space (300) and can move along the axial direction of the piston rod (240). During buffering, the sealing ring (250) cuts off the first oil passage (290), and the hydraulic oil in the first oil chamber (270) enters the second oil chamber (280) through the first buffer channel (260).

2. The small shaft hydraulic cylinder hinge according to claim 1, characterized in that, It also includes an oil valve (330), which is a cylindrical structure. The radial outer surface of the oil valve (330) is provided with a first spiral groove (310). The piston rod (240) is provided with a mounting hole. The oil valve (330) and the mounting hole are tightly connected. The first buffer channel is formed between the first spiral groove (310) and the inner wall of the mounting hole.

3. The small shaft hydraulic cylinder hinge according to claim 1, characterized in that, The inner wall of the oil cavity (230) is provided with an oil guide groove (320), and the oil guide groove (320) cooperates with the radial outer surface of the sealing ring (250) to form a second buffer channel.

4. The small shaft hydraulic cylinder hinge according to claim 1, characterized in that, The buffer mechanism also includes a tube (350) with the oil cavity (230) formed inside the tube (350).

5. A small shaft hydraulic cylinder hinge according to claim 4, characterized in that, The piston rod (240) is provided with a pusher (180), and a Y-ring (360) is provided between the pusher (180) and the oil chamber (230). The pusher (180) is sealed to the tube body (350) through the Y-ring (360).

6. The small shaft hydraulic cylinder hinge according to claim 1, characterized in that, The cylinder (100) is provided with a spiral channel (160), the sleeve (110) is provided with a straight channel (170), and the transmission member (370) can slide along the spiral channel (160) and the straight channel (170).

7. A small shaft hydraulic cylinder hinge according to claim 1, characterized in that, The cylinder (100) includes a first cylinder (210) and a second cylinder (220) connected by threads, and an annular groove is formed between the first cylinder (210) and the second cylinder (220) to accommodate the sleeve (110).

8. A small shaft hydraulic cylinder hinge according to claim 1, characterized in that, The inner wall of the cylinder (100) is threaded with a first adjusting screw (190), which is used to adjust the elastic force of the first spring (150).

9. A small shaft hydraulic cylinder hinge according to claim 1, characterized in that, The buffer mechanism also includes a second spring (340), which is located in the oil chamber (230) and is used to drive the piston to move.

10. A small shaft hydraulic cylinder hinge according to claim 9, characterized in that, The inner wall of the oil cavity (230) is threaded with a second adjusting screw (200), which is used to adjust the elastic force of the second spring (340).

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