Adjustable cushioning oil cylinder

Abstract

The utility model relates to the technical field of oil cylinder, concretely relates to an adjustable buffer oil cylinder, an adjustable buffer oil cylinder, include: cylinder body, piston rod is located in the cylinder body and can move along its axial movement, and the one end side fixedly provided with the piston of piston rod extension cylinder body, cylinder body one end is equipped with the guide sleeve, buffer structure is located in the cylinder body outside, and the buffer structure includes throttle valve group, detection element and joint assembly, and the throttle valve group is assembled on the cylinder body through the joint assembly, and the throttle valve group is equipped with the throttle spool convenient to replace in, and the joint assembly includes first joint assembly and second joint assembly, and first joint assembly one end is linked with first channel on the cylinder body and communicates, and the other end is linked with the oil inlet flow channel on the throttle valve group and communicates, second joint assembly one end is linked with second channel on the cylinder body and communicates, and the other end is linked with the oil outlet flow channel on the throttle valve group and communicates. Buffer structure is external, and the whole is simple and compact, and the inconvenient problem of buffer structure replacement in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to an adjustable buffer hydraulic cylinder. Background Technology

[0002] As a key actuator in the hydraulic system of engineering machinery, the hydraulic cylinder mainly ensures the normal operation of the machinery through the reciprocating motion of the piston rod. When the piston moves to the end of its stroke under the push of the hydraulic oil in the large and small chambers, it is inevitable that impact and collision will occur, causing damage to the hydraulic cylinder. Therefore, a buffer structure needs to be set on the hydraulic cylinder.

[0003] Existing hydraulic cylinder buffer structures are typically built-in. For example, application number CN201320368938.X discloses a buffer device for a small excavator cylinder, including a spacer and a buffer sleeve. The spacer has a pressure relief hole, and the outer axial ring surface of the buffer sleeve has a flat buffer channel. Hydraulic oil is discharged through the pressure relief hole. The diameter of the buffer channel gradually decreases from the front end to the rear end, and it is sealed with the cylinder barrel by an O-ring, thus delaying the impact time. However, when it is necessary to adjust the buffer through the pressure relief hole, it is necessary to disassemble the hydraulic cylinder and replace the spacer, which is costly and difficult to operate. Utility Model Content

[0004] The main technical problem to be solved by this utility model is to address the inconvenience of replacing the buffer structure in the existing technology.

[0005] Therefore, this utility model provides an adjustable buffer cylinder. Through structural improvement, the buffer structure is located on the outside of the cylinder body, and the throttle valve core can be easily replaced to adjust the buffering effect without disassembling the cylinder.

[0006] The technical solution adopted by this utility model to solve its technical problem is: an adjustable buffer cylinder, characterized in that it includes: Cylinder block, and A piston rod is disposed in the cylinder and is movable along its axial direction. A piston is fixedly provided on one end of the piston rod that extends into the cylinder. A guide sleeve is provided on the end of the cylinder away from the piston rod. A buffer structure is provided, comprising a throttle valve assembly, a detection element, and a connector assembly. The throttle valve assembly is mounted on the cylinder block via the connector assembly. The throttle valve assembly contains a detachable throttle valve core. The connector assembly comprises a first connector assembly and a second connector assembly. One end of the first connector assembly is connected to a first channel on the cylinder block, and the other end is connected to an oil inlet channel on the throttle valve assembly. One end of the second connector assembly is connected to a second channel on the cylinder block, and the other end is connected to an oil outlet channel on the throttle valve assembly.

[0007] According to one embodiment of the present invention, the throttle valve core is disposed between the oil inlet channel and the oil outlet channel.

[0008] According to one embodiment of the present invention, the front end of the throttle valve core is an oil inlet, and the diameter of the front end of the throttle valve core is larger than the diameter of the rear end of the throttle valve core.

[0009] According to one embodiment of the present invention, the detection element is installed on the throttle valve assembly, and the detection end of the detection element is located near the oil inlet of the throttle valve core.

[0010] According to one embodiment of the present invention, each connector assembly consists of an adapter and a ferrule connector. A flow monitoring element is provided between the adapter and the ferrule connector of the second connector assembly for measuring the flow rate of the throttling loop.

[0011] According to one embodiment of the present invention, a buffer sleeve is also included, which is disposed on the piston rod near the piston, and the guide sleeve has an inner sidewall that is clearance-fitted with the outer periphery of the buffer sleeve.

[0012] According to one embodiment of the present invention, the piston divides the cylinder body into a rodless chamber and a rod chamber. The first channel is connected to the high-pressure chamber formed by the guide sleeve, the cylinder body, the piston, and the buffer sleeve. The guide sleeve is provided with a through hole and an annular groove. The second channel is connected to the low-pressure chamber formed by the through hole and the annular groove.

[0013] According to one embodiment of the present invention, the cylinder body is provided with a first oil port and a second oil port. Oil is supplied to the inside of the cylinder body through the first oil port and the second oil port to push the piston rod to move back and forth. The first oil port is connected to the rodless cavity, and the second oil port is connected to the rod cavity through the through hole and the annular groove.

[0014] According to one embodiment of the present invention, a first sealing structure is provided between the guide sleeve and the cylinder body, a second sealing structure is provided between the guide sleeve and the piston rod, a third sealing structure is provided between the piston and the cylinder body, and a fourth sealing structure is provided between the piston and the piston rod.

[0015] According to one embodiment of the present invention, the end of the cylinder body away from the piston rod is provided with a cylinder bottom.

[0016] Based on the above technical solution, the technical effects that this utility model can achieve are as follows: The adjustable buffer cylinder of this utility model has a buffer structure located on the outside of the cylinder body. This structure can gradually reduce the speed of the high-speed moving piston within the buffer stroke, avoiding severe vibration when the piston reaches both ends. This effectively protects the hydraulic components and hydraulic system, improves the overall stability and the operator's experience, and helps extend the service life of the entire machine. More importantly, the buffer pressure and buffer effect can be adjusted by simply replacing the throttle valve core of the external throttle valve assembly without disassembling the cylinder and the piston with high torque. The throttle valve assembly has a compact structure and is connected to the cylinder by a threaded connector assembly. It is easy to disassemble, highly versatile, small in size, easy to carry, and convenient to operate.

[0017] The detection element in the buffer structure is directly integrated and installed on the throttle valve assembly, connected to the oil inlet of the throttle valve core. It can directly measure the oil temperature and / or buffer pressure inside the oil cylinder after connecting a temperature sensor and / or a pressure sensor without disassembling the oil cylinder. This solves the technical problem that temperature and pressure sensors are inconvenient to insert into the oil cylinder to measure oil temperature and pressure. It makes reasonable use of the space of the throttle valve assembly to reduce external pipeline connections and reduce assembly difficulty. The structure is simple and reliable, and it is also easy to quickly replace different sensors to achieve different measurement requirements such as oil temperature and oil pressure.

[0018] The throttle valve assembly does not require arc surface machining or large-area welding to the cylinder body. It can be threadedly connected to the cylinder body only through the connector assembly, which saves costs and is less likely to cause deformation and performance damage to the cylinder body. According to the requirements, a flow monitoring element can be set between the adapter and the ferrule of the second connector assembly to measure the flow of each throttle circuit, thereby assisting in buffer debugging and buffer research. It solves the technical problems of existing cylinder designs that cannot measure the flow distribution of each return oil circuit and cannot clearly monitor the buffer oil diversion during debugging. The radial flow channel design in the connector assembly and throttle valve assembly realizes efficient flow of hydraulic oil inlet and return oil while ensuring the stability and reliability of the buffer structure, and facilitates quick disassembly and assembly of the throttle valve assembly and the flow monitoring element. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the adjustable buffer cylinder of this utility model; Figure 2 This is a cross-sectional view of the internal structure of the adjustable buffer cylinder of this utility model; Figure 3 This is a schematic diagram of the throttling valve assembly of this utility model; Figure 4 This is a schematic diagram of the structure of the adapter of this utility model; Figure 5 This is a schematic diagram of the structure of the throttling valve core of this utility model; Figure 6 This is a schematic diagram of an embodiment of the detection element of this utility model.

[0020] In the diagram: 1-Cylinder block; 11-First channel; 12-Second channel; 13-First oil port; 14-Second oil port; 15-Rodless chamber; 16-Rod chamber; 2-Piston rod; 3-Piston; 31-Third sealing structure; 32-Fourth sealing structure; 4-Guide sleeve; 41-Through hole; 42-First sealing structure; 43-Second sealing structure; 44-Annular groove; 5-Throttle valve assembly; 51-Throttle valve core; 511-Front end; 512-Rear end; 513-Conical surface; 52-Inlet oil passage; 53-Outlet oil passage; 6-Detection element; 7-Connector assembly; 71-First connector assembly; 72-Second connector assembly; 73-Adapter; 74-Compression fitting; 75-Threaded seat; 8-Buffer sleeve; 9-Cylinder bottom. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0025] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0027] like Figure 1-2As shown, this embodiment provides an adjustable buffer cylinder, including a cylinder body 1 and a piston rod 2 disposed inside the cylinder body 1 and capable of moving along its axial direction. A piston 3 is fixedly disposed on one end of the piston rod 2 that extends into the cylinder body 1, and a guide sleeve 4 is disposed on the end of the cylinder body 1 away from the piston rod 2. Preferably, in this embodiment, the guide sleeve 4 is disposed at the end of the cylinder body 1 near the piston rod 2. A buffer structure is disposed on the outside of the cylinder body 1. The buffer structure includes a throttle valve assembly 5, a detection element 6, and a connector assembly 7. Since existing excavator cylinders require disassembly of the cylinder and the piston with high torque when debugging the cylinder buffer, the steps are cumbersome and require the assistance of professional tools. Therefore, the cylinder of this utility model assembles the throttle valve assembly 5 onto the cylinder body 1 through the connector assembly 7. The throttle valve assembly 5 does not need to be machined with an arc surface and is welded to the cylinder body 1 over a large area. It can be threadedly connected to the cylinder body 1 through the connector assembly 7, which saves costs and avoids the cylinder body thermal deformation caused by large-area welding, which would affect the sealing effect and movement accuracy and reduce its pressure bearing capacity. The throttle valve assembly 5 is equipped with a detachable and easily replaceable throttle valve core 51. When adjusting the buffering effect, there is no need to disassemble the oil cylinder or replace the guide sleeve. The pressure relief of the buffering structure can be adjusted by replacing the entire buffering structure or replacing the throttle valve core 51, thereby optimizing the buffering effect and pressure of the oil cylinder. While ensuring the stability of the buffering structure and the comfort of the operator, the cost of buffering spare parts is reduced, the work efficiency during buffering adjustment is improved, and the manufacturing cost of the oil cylinder is controlled.

[0028] Furthermore, existing hydraulic cylinders do not allow for precise measurement of internal oil temperature and / or pressure by sensors that can penetrate deep into the cylinder. In this application, the detection element 6 is mounted on the throttle valve assembly 5, with the detection end of the element 6 positioned near the oil inlet of the throttle valve core 51. For example... Figure 6 As shown, in a specific embodiment, the detection element 6 is a pressure and temperature integrated connector, which can directly connect a temperature sensor and / or a pressure sensor to the detection element 6 for real-time measurement of oil temperature and / or oil pressure.

[0029] The adjustable buffer cylinder in this embodiment also includes a buffer sleeve 8, which is located on the piston rod 2 near the piston 3. The guide sleeve 4 has an inner wall that is clearance-fitted with the outer circumference of the buffer sleeve 8. In a preferred embodiment, the connector assembly 7 includes a first connector assembly 71 and a second connector assembly 72. One end of the first connector assembly 71 is connected to the first channel 11 on the cylinder body 1, and the other end is connected to the oil inlet channel 52 on the throttle valve assembly 5. This prevents the cylinder body 1 from expanding due to excessive buffer back pressure. The buffer back pressure generated when the buffer sleeve 8 just enters the inner wall of the guide sleeve 4 can be quickly throttled and released outwards through the first channel 11. One end of the second connector assembly 72 is connected to the second channel 12 on the cylinder body 1, and the other end is connected to the oil outlet channel 53 on the throttle valve assembly 5. The throttle valve core 51 is located between the oil inlet channel 52 and the oil outlet channel 53. The radial flow channel design in the connector assembly 7 and the throttle valve group 5 enables efficient flow of hydraulic oil inlet and outlet while ensuring the stability and reliability of the buffer structure, and facilitates quick disassembly and replacement of various components in the buffer structure.

[0030] Furthermore, such as Figure 3-4 As shown, the connector assembly 7 consists of an adapter 73 and a ferrule connector 74. The ferrule connector 74 generates axial force by tightening the nut, causing the ferrule's cutting edge to cut into the surface of the throttle valve assembly 5, forming a physical locking structure. In this embodiment, the connection between the ferrule connector 74 and the throttle valve assembly 5 is sealed by welding to effectively prevent media leakage. At the same time, the elastic deformation of the ferrule is used to offset vibration and pressure fluctuations, preventing the nut from loosening. In this embodiment, the adapter 73 is connected to the cylinder 1 by a threaded seat 75 welded to the cylinder 1. A flow monitoring element (not shown in the figure) can be set between the adapter 73 and the ferrule connector 74 of the second connector assembly 72 as needed to measure the flow rate of each throttle circuit, that is, the flow rate of the circuit throttled by the throttle valve core 51 and the circuit throttled by the buffer sleeve 8 and the guide sleeve 4 with clearance fit in this embodiment.

[0031] Specifically, firstly, according to the formula π*(Dd)*L, the volume Q of the buffer chamber oil is fixed, where D is the diameter of cylinder 1, d is the outer diameter of buffer sleeve 8, and L is the length of buffer sleeve 8. When the flow monitoring element measures the throttling circuit flow Q1 of the throttling valve core 51, the annular gap flow Q2 of the clearance fit between buffer sleeve 8 and guide sleeve 4 can be calculated: Q2=Q-Q1. This solves the technical problem that in existing hydraulic cylinders, when the oil is throttled in two separate oil paths and returns to the oil tank, it is impossible to clearly understand the oil distribution during debugging and to measure the flow distribution of each return oil path. This embodiment can monitor the flow of each of the two throttling return oil paths, thereby assisting in buffer debugging. According to the above formula, when the throttling valve core 51 is replaced, the flow of the two throttling circuits will be redistributed due to the throttling effect. The annular gap flow Q2 of the clearance fit between buffer sleeve 8 and guide sleeve 4 will change with the change of the throttling circuit flow Q1 of the throttling valve core 51. Customers can quickly adjust the flow of each throttling circuit according to their needs.

[0032] like Figure 5 As shown, the front end 511 of the throttle valve core 51 is the oil inlet. The diameter of the front end 511 is larger than the diameter of the rear end 512 of the throttle valve core 51. The front end 511 and the rear end 512 are connected by a conical surface 513, which allows the flow rate of hydraulic oil exiting from the throttle valve core 51 to gradually decrease, delaying the impact time and gradually reducing the impact force, thus achieving the purpose of buffering. The overall buffer structure of this application is compact and simple, easy to disassemble, has a small welding surface and is not limited by conditions such as thin cylinder body, has high versatility and is applicable to different specifications of hydraulic cylinders. It is small in size, easy to carry, and easy to operate.

[0033] like Figure 2 As shown, the guide sleeve 4 is provided with a through hole 41 and an annular groove 44. The piston 3 divides the cylinder 1 into a rodless chamber 15 and a rod chamber 16. The cylinder 1 is provided with a first oil port 13 and a second oil port 14. The first oil port 13 is connected to the rodless chamber 15, and the through hole 41 and annular groove 44 of the second oil port 14 are connected to the rod chamber 16. Oil is supplied to the inside of the cylinder 1 through the first oil port 13 and the second oil port 14 to push the piston rod 2 to move back and forth. More specifically, as the piston rod 2 extends, when the buffer sleeve 8 enters the inner wall of the guide sleeve 4 to begin buffering, a portion of the high-pressure oil will return through the throttling gap between the buffer sleeve 8 and the guide sleeve 4. At this time, a high-pressure chamber is formed between the guide sleeve 4, the cylinder 1, the piston 3, and the buffer sleeve 8. The first channel 11 is connected to the high-pressure chamber. Another portion of the high-pressure oil will return through the first channel 11 and then through the throttling orifice of the throttling valve core 51. The through hole 41 and the annular groove 44 form a low-pressure cavity, and the second channel 12 communicates with the low-pressure cavity. Preferably, the through hole 41 is evenly distributed along the circumference of the guide sleeve 4.

[0034] In the preferred technical solution, a first sealing structure 42 is provided between the guide sleeve 4 and the cylinder body 1, a second sealing structure 43 is provided between the guide sleeve 4 and the piston rod 2, a third sealing structure 31 is provided between the piston 3 and the cylinder body 1, and a fourth sealing structure 32 is provided between the piston 3 and the piston rod 2, which facilitates the protection of the nearby oil chambers and prevents hydraulic oil leakage. A cylinder bottom 9 is provided at the end of the cylinder body 1 away from the piston rod 2.

[0035] In summary, the working process of this utility model is as follows: When piston rod 2 needs to extend, hydraulic oil enters the rodless chamber 15 through the first oil port 13, pushing piston 3 to extend piston rod 2. Oil in the rod chamber 16 flows out through the annular groove 44 and through hole 41 on the guide sleeve 4, and then exits from the second oil port 14. Figure 2 As shown, when the buffer sleeve 8 begins to enter the guide sleeve 4, the oil pressure in the high-pressure chamber begins to increase, and the cylinder begins to buffer. Part of the hydraulic oil in the high-pressure chamber is throttled to the low-pressure chamber through the gap between the buffer sleeve 8 and the guide sleeve 4, and then returns to the oil tank through the second oil port 14. Another part of the high-pressure oil passes through the first channel 11 on the cylinder body 1, sequentially through the first connector assembly 71, the oil inlet channel 52 of the throttle valve assembly 5, and reaches the throttle valve core 51. After being throttled from the front end 511 to the rear end 512 of the throttle valve core 51, the oil sequentially passes through the oil outlet channel 53, the second connector assembly 72, the second channel 12 on the cylinder body 1, and the low-pressure chamber, flowing to the second oil port 14 and returning to the oil tank. By reducing the flow rate and throttling, the cylinder's operating speed is slowed down until it stops, thus achieving the function of throttling and buffering.

[0036] When buffer adjustment is required, simply replacing the throttle valve core 51 will adjust the buffering effect and pressure. When measuring the internal oil temperature and / or internal oil buffering pressure, a detection element 6 can be installed near the oil inlet of the throttle valve core 51. The detection element 6 can be a temperature sensor and / or a pressure sensor for real-time temperature / pressure measurement. When debugging or studying the buffer, a flow monitoring element (such as a flow meter) can be screwed between the adapter 73 and the compression fitting 74 of the second connector assembly 72 to measure and analyze the throttling flow, clearly monitor the buffer oil distribution, and calculate the flow distribution of each return oil path, thereby assisting in buffer debugging.

[0037] The adjustable buffer cylinder of this embodiment improves the structure by placing the buffer structure on the outside of the cylinder body 1. The throttle valve core 51 can be easily replaced to adjust the buffering effect without disassembling the cylinder. The structure is compact and can detect the oil temperature and pressure inside the cylinder through the detection element 6, and can also connect to the flow monitoring element through the connector assembly 7 to measure the flow of the throttle circuit. It is highly operable, small in size and highly versatile.

[0038] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings. However, this utility model is not limited to the above embodiments. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. An adjustable buffer cylinder, characterized in that, include: Cylinder block (1), and A piston rod (2) is located inside the cylinder (1) and can move along its axial direction. A piston (3) is fixed at one end of the piston rod (2) that extends into the cylinder (1). A guide sleeve (4) is provided at one end of the cylinder (1) away from the piston rod (2). The buffer structure includes a throttle valve assembly (5), a detection element (6), and a connector assembly (7). The throttle valve assembly (5) is mounted on the cylinder body (1) through the connector assembly (7). The throttle valve assembly (5) has a detachable throttle valve core (51). The connector assembly (7) includes a first connector assembly (71) and a second connector assembly (72). One end of the first connector assembly (71) is connected to the first channel (11) on the cylinder body (1), and the other end is connected to the oil inlet channel (52) on the throttle valve assembly (5). One end of the second connector assembly (72) is connected to the second channel (12) on the cylinder body (1), and the other end is connected to the oil outlet channel (53) on the throttle valve assembly (5).

2. The adjustable buffer cylinder according to claim 1, characterized in that, The throttle valve core (51) is disposed between the oil inlet channel (52) and the oil outlet channel (53).

3. An adjustable buffer cylinder according to claim 1, characterized in that, The front end (511) of the throttle valve core (51) is an oil inlet, and the diameter of the front end (511) of the throttle valve core (51) is larger than the diameter of the rear end (512) of the throttle valve core (51).

4. An adjustable buffer cylinder according to claim 1, characterized in that, The detection element (6) is installed on the throttle valve assembly (5), and the detection element (6) is located at the oil inlet of the throttle valve core (51) at one end.

5. An adjustable buffer cylinder according to claim 1, characterized in that, Each connector assembly (7) consists of an adapter (73) and a compression fitting (74). A flow monitoring element is provided between the adapter (73) and the compression fitting (74) of the second connector assembly (72) for measuring the flow of the throttling circuit.

6. An adjustable buffer cylinder according to claim 1, characterized in that, It also includes a buffer sleeve (8), which is located on the piston rod (2) near the piston (3), and the inner wall of the guide sleeve (4) is in clearance fit with the outer periphery of the buffer sleeve (8).

7. An adjustable buffer cylinder according to claim 6, characterized in that, The piston (3) divides the interior of the cylinder (1) into a rodless chamber (15) and a rod chamber (16). The first channel (11) is connected to the high-pressure chamber formed by the guide sleeve (4), the cylinder (1), the piston (3), and the buffer sleeve (8). The guide sleeve (4) is provided with a through hole (41) and an annular groove (44). The second channel (12) is connected to the low-pressure chamber formed by the through hole (41) and the annular groove (44).

8. An adjustable buffer cylinder according to claim 7, characterized in that, The cylinder (1) is provided with a first oil port (13) and a second oil port (14). Oil is supplied to the inside of the cylinder (1) through the first oil port (13) and the second oil port (14) to push the piston rod (2) to move back and forth. The first oil port (13) is connected to the rodless chamber (15), and the second oil port (14) is connected to the rod chamber (16) through the through hole (41) and the annular groove (44).

9. An adjustable buffer cylinder according to claim 1, characterized in that, A first sealing structure (42) is provided between the guide sleeve (4) and the cylinder (1), a second sealing structure (43) is provided between the guide sleeve (4) and the piston rod (2), a third sealing structure (31) is provided between the piston (3) and the cylinder (1), and a fourth sealing structure (32) is provided between the piston (3) and the piston rod (2).

10. An adjustable buffer cylinder according to claim 1, characterized in that, The cylinder body (1) has a cylinder bottom (9) at the end away from the piston rod (2).

Images