CN117869422A - Double-acting damping oil cylinder - Google Patents

Abstract

The invention provides a double-acting damping cylinder, and relates to the technical field of hydraulic pressure. The double-acting damping cylinder comprises a cylinder barrel and a piston piece, the cylinder barrel is provided with a first cavity, a second cavity and a buffer flow channel, two ends of the buffer flow channel are respectively communicated with the first cavity and the second cavity, and the first cavity and the second cavity are used for accommodating fluid media; the piston member is movably arranged in the first cavity and the second cavity to drive the fluid medium to flow between the first cavity and the second cavity. The piston member does not need to extend out of the cylinder barrel in the whole movement process, so that the axial working size of the double-acting damping device is reduced, the structure of the double-acting damping device is simpler and more compact, and the working capacity and the adaptability are improved.

Description

Double-acting damping oil cylinder

Technical Field

The invention relates to the technical field of hydraulic pressure, in particular to a double-acting damping cylinder.

Background

The hydraulic cylinder is a hydraulic element that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). The traditional hydraulic cylinder is mainly used as a driving part, has the advantages of no reduction gear, no transmission clearance, stable movement, large driving force and the like, and particularly has the characteristic of bidirectional constant speed of the double-rod hydraulic cylinder.

When the oil inlet path of the double-rod type hydraulic oil cylinder is disconnected and only the oil return oil pressure is controlled, the oil cylinder rod can obtain resistance opposite to the movement direction. However, when the existing double-rod hydraulic cylinder is used as a damping cylinder, the structure is complex, the length of the cylinder rod is long, and the space arrangement is inconvenient. Therefore, in order to fully utilize the advantages of the hydraulic cylinder, the double-rod hydraulic cylinder needs to be optimized, and a double-acting hydraulic damping cylinder with a compact structure is designed.

Disclosure of Invention

The invention provides a double-acting damping oil cylinder, which has a simple and compact structure, and when a piston part moves bidirectionally, the piston part does not need to extend out of a cylinder barrel, so that the axial working size of the oil cylinder is reduced, and the working capacity is improved.

Embodiments of the invention may be implemented as follows:

in a first aspect, the present invention provides a double acting damping cylinder comprising:

the cylinder barrel is provided with a first cavity, a second cavity and a buffer flow channel, two ends of the buffer flow channel are respectively communicated with the first cavity and the second cavity, and the first cavity and the second cavity are used for accommodating fluid media;

the piston piece is movably arranged in the first cavity and the second cavity so as to drive the fluid medium to flow between the first cavity and the second cavity.

In an alternative embodiment, the double-acting damping cylinder further comprises a valve body, wherein the valve body is arranged on the buffer flow passage, and the valve body is used for conducting the buffer flow passage when the fluid medium flows from the first cavity to the second cavity or from the second cavity to the first cavity.

In an alternative embodiment, the buffer flow channel comprises a first flow channel and a second flow channel, and the valve body comprises a first pressure regulating valve and a second pressure regulating valve;

the first pressure regulating valve is arranged on the first flow passage and is used for conducting the first flow passage when the fluid medium flows from the second cavity to the first cavity;

the second pressure regulating valve is arranged on the second flow passage and is used for conducting the second flow passage when the fluid medium flows from the first cavity to the second cavity.

In an alternative embodiment, the first pressure regulating valve comprises a first valve sleeve, a first valve core and a first spring, wherein the first valve sleeve is arranged in the first flow channel, the first valve core is movably arranged in the first valve sleeve, one end of the first spring is connected with the first valve sleeve, the other end of the first spring is connected with the first valve core, and the first valve core is used for blocking the first flow channel under the action of the first spring or is used for compressing the first spring under the action of the fluid medium so as to lead the first flow channel to be conducted;

and/or the second pressure regulating valve comprises a second valve sleeve, a second valve core and a second spring, wherein the second valve sleeve is arranged in the second flow passage, the second valve core is movably arranged in the second valve sleeve, two ends of the second spring are connected with the second valve sleeve, the other ends of the second spring are connected with the second valve core, and the second valve core is used for blocking the first flow passage under the action of the second spring or compressing the second spring under the action of the fluid medium so as to conduct the second flow passage.

In an alternative embodiment, the first pressure regulating valve further comprises a first regulating bolt and a first regulating nut, wherein one end of the first regulating bolt is connected with the first valve sleeve, and the other end of the first regulating bolt is fixedly matched with the first regulating nut;

and/or the second pressure regulating valve further comprises a second regulating bolt and a second regulating nut, one end of the second regulating bolt is connected with the second valve sleeve, and the other end of the second regulating bolt is fixedly matched with the second regulating nut.

In an alternative embodiment, the cylinder is provided with a pressure regulating portion, and the first flow passage and the second flow passage are both provided in the pressure regulating portion.

In an alternative embodiment, the double-acting damping cylinder further comprises a partition member, the piston member comprises a first plug body, a second plug body and a piston rod, the partition member is arranged in the cylinder barrel to partition the cylinder barrel into a first cavity and a second cavity, the piston rod movably penetrates through the partition member, the first plug body is arranged in the first cavity and is connected with one end of the piston rod, and the second plug body is arranged in the second cavity and is connected with the other end of the piston rod.

In an alternative embodiment, the partition is provided with a through hole, the through hole is used for the piston rod to penetrate, the inner wall of the through hole is provided with a first annular groove, and the first annular groove is used for installing a sealing ring;

and/or the outer wall of the partition piece is also provided with a second annular groove in a ring mode, and the second annular groove is used for installing a sealing ring.

In an alternative embodiment, the double acting damping cylinder further comprises a mount;

the outer wall of the partition piece is also provided with a third annular groove, the number of the second annular grooves is two, the two second annular grooves are positioned on two sides of the third annular groove, and the fixing piece is arranged in the cylinder barrel and is fixedly matched with the third annular groove.

In an alternative embodiment, the first plug body is provided with a fourth ring groove, the second plug body is provided with a fifth ring groove, and the fourth ring groove and the fifth ring groove are used for installing a sealing ring.

The double-acting damping cylinder provided by the embodiment of the invention has the beneficial effects that: under the condition that the piston member moves bidirectionally relative to the first cavity and the second cavity, the piston member drives a fluid medium to flow from the first cavity to the second cavity or from the second cavity to the first cavity through the buffer flow channel, and the fluid medium can provide a reaction force for the piston member in the flowing process, so that a damping effect is effectively achieved, and the acting force is stable; the piston part does not need to extend out of the cylinder barrel in the whole movement process, so that the axial working size of the double-acting damping device is reduced, the structure of the double-acting damping device is simpler and more compact, and the working capacity and the adaptability are strong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a double-acting damping cylinder according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a dual acting damping cylinder provided by an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a pressure regulating portion according to an embodiment of the present invention;

fig. 4 is a schematic view of a piston rod structure according to an embodiment of the present invention;

FIG. 5 is a schematic view of a separator according to an embodiment of the present invention;

fig. 6 is a working schematic diagram of a double-acting damping cylinder according to an embodiment of the present invention.

Icon: 10-a double-acting damping cylinder; 100-cylinder barrel; 110-a first cavity; 120-a second cavity; 130-buffer flow channel; 131-a first flow channel; 132-a second flow channel; 140-a pressure regulating part; 141-a process hole; 150-plugs; 200-piston member; 210-a first plug body; 211-a fourth ring groove; 220-a second plug body; 221-a fifth ring groove; 230-a piston rod; 300-valve body; 310-a first pressure regulating valve; 311-a first valve sleeve; 312-a first valve spool; 313-a first spring; 314—a first adjusting bolt; 315—a first adjusting nut; 320-a second pressure regulating valve; 321-a second valve sleeve; 322-a second spool; 323-a second spring; 324-a second adjusting bolt; 325-a second adjustment nut; 400-spacers; 410-a through hole; 420-a first ring groove; 430-a second ring groove; 440-a third ring groove; 500-sealing rings; 600-fixing piece; 700-steel rope; 800-linker; 900-end cap.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

The hydraulic cylinder is a hydraulic element that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). The traditional hydraulic cylinder is mainly used as a driving part, has the advantages of no reduction gear, no transmission clearance, stable movement, large driving force and the like, and particularly has the characteristic of bidirectional constant speed of the double-rod hydraulic cylinder.

When the oil inlet path of the double-rod type hydraulic oil cylinder is disconnected and only the oil return oil pressure is controlled, the oil cylinder rod can obtain resistance opposite to the movement direction. However, when the existing double-rod hydraulic cylinder is used as a damping cylinder, the structure is complex, the length of the cylinder rod is long, and the space arrangement is inconvenient. Therefore, in order to fully utilize the advantages of the hydraulic cylinder, the double-rod hydraulic cylinder needs to be optimized, and a double-acting hydraulic damping cylinder with a compact structure is designed. Therefore, in order to fully utilize the advantages of the hydraulic cylinder, it is necessary to optimize the double-rod hydraulic cylinder, and a double-acting damping cylinder with compact structure is designed.

Referring to fig. 1 to 5, the present invention provides a double-acting damping cylinder 10, which is applied to the field of hydraulic technology, and is particularly suitable for an aircraft control surface loading test.

The double acting damping cylinder 10 includes a cylinder tube 100, a piston member 200, and a valve body 300.

In detail, the cylinder 100 is provided with a first cavity 110, a second cavity 120 and a buffer flow channel 130, two ends of the buffer flow channel 130 are respectively communicated with the first cavity 110 and the second cavity 120, and the first cavity 110 and the second cavity 120 are used for accommodating a fluid medium; it should be noted that, the inner diameter of the buffer flow channel 130 is generally smaller than the inner diameters of the first cavity 110 and the second cavity 120, and is serpentine.

It will be appreciated that the first and second chambers 110, 120 are only in communication via the buffer flow channel 130, and that the interior of the cylinder 100 may be partitioned into the first and second chambers 110, 120 by providing a spacer inside the cylinder 100; furthermore, the reducing section may be disposed in the middle of the cylinder barrel 100, and the piston member 200 may be inserted into the reducing section and separate the left and right cavities of the reducing section into the first cavity 110 and the second cavity 120, so that various embodiments of the first cavity 110 and the second cavity 120 may be provided, which are not limited herein.

As long as the piston member 200 is ensured to be movably arranged in the first cavity 110 and the second cavity 120, the fluid medium can be driven to flow between the first cavity 110 and the second cavity 120 by driving the piston member 200 to move along the extending direction of the first cavity 110 and the second cavity 120; besides, the piston member 200 can be driven to move by injecting the fluid medium, so that the piston member can be adjusted according to actual requirements.

Therefore, in the present embodiment, under the condition that the piston member 200 moves bi-directionally relative to the first cavity 110 and the second cavity 120, the piston member 200 drives the fluid medium to flow from the first cavity 110 to the second cavity 120 or from the second cavity 120 to the first cavity 110 through the buffer flow channel 130, and the fluid medium provides a reaction force to the piston member 200 during the flowing process, so that the damping effect is effectively achieved, and the acting force is stable; the piston member 200 does not need to extend out of the cylinder tube 100 during the entire movement, so that the axial working size of the double-acting damping device is reduced, the structure is simpler and more compact, and the working capacity and adaptability are improved.

Further, the valve body 300 is disposed in the buffer flow channel 130, and the valve body 300 is used for conducting the buffer flow channel 130 when the fluid medium flows from the first cavity 110 to the second cavity 120 or from the second cavity 120 to the first cavity 110.

In the present embodiment, the buffer flow channel 130 connects the first cavity 110 and the second cavity 120, and can control the pressure of the fluid medium passing through the valve body 300.

It should be noted that, the number of the buffer flow channels 130 may be one, and by providing one valve body 300 in the buffer flow channel 130, the valve body 300 may be a pressure regulating valve, and the pressure regulating valve is in a closed state when the fluid medium does not flow, and when the fluid medium flows along any direction of the buffer flow channel 130, the pressure regulating valve is slowly opened by the acting force of the fluid medium, so as to achieve the purpose of delaying the conduction of the buffer flow channel 130, and thus play a role of damping.

Of course, in other embodiments, the number of the buffer flow channels 130 may be plural, for example, as shown in fig. 3, the buffer flow channels 130 include a first flow channel 131 and a second flow channel 132, and the valve body 300 includes a first pressure regulating valve 310 and a second pressure regulating valve 320;

the first pressure regulating valve 310 is disposed in the first flow channel 131, and the first pressure regulating valve 310 is configured to enable the first flow channel 131 to be communicated when the fluid medium flows from the second cavity 120 to the first cavity 110; the second pressure regulating valve 320 is disposed in the second flow channel 132, and the second pressure regulating valve 320 is configured to allow the second flow channel 132 to be in communication when the fluid medium flows from the first chamber 110 to the second chamber 120.

In the present embodiment, by providing the first flow passage 131 and the second flow passage 132, providing the first pressure regulating valve 310 in the first flow passage 131, providing the second pressure regulating valve 320 in the second flow passage 132, and providing the first pressure regulating valve 310 and the second pressure regulating valve 320 in opposite directions, the damping effect is achieved by the second pressure regulating valve 320 in the case where the fluid medium flows from the first chamber 110 to the second chamber 120, and the damping effect is achieved by the first pressure regulating valve 310 in the case where the fluid medium flows from the second chamber 120 to the first chamber 110, thereby achieving the bidirectional damping effect.

In detail, the first pressure regulating valve 310 includes a first valve housing 311, a first valve core 312, and a first spring 313, the first valve housing 311 is disposed in the first flow channel 131, the first valve core 312 is movably disposed in the first valve housing 311, one end of the first spring 313 is connected to the first valve housing 311, the other end is connected to the first valve core 312, and the first valve core 312 is used for blocking the first flow channel 131 under the action of the first spring 313, or is used for compressing the first spring 313 under the action of a fluid medium so as to make the first flow channel 131 conduct.

In this embodiment, two ends of the first flow channel 131 are a liquid inlet and a liquid outlet, the liquid inlet is communicated with the second cavity 120, the liquid outlet is communicated with the first cavity 110, and the first valve core 312 is located between the liquid inlet and the liquid outlet to block the first flow channel 131, and the first spring 313 is in an original state. When the fluid medium flows from the second cavity 120 to the first cavity 110, the fluid medium acts on the first valve element 312 and drives the first valve element 312 to compress the first spring 313 until the first valve element 312 is brought to the liquid outlet, so as to conduct the first flow channel 131. After the fluid medium stops flowing, the first spring 313 generates elastic restoring force to drive the first valve core 312 to move between the liquid inlet and the liquid outlet again so as to block the first flow channel 131.

Similarly, the second pressure regulating valve 320 includes a second valve sleeve 321, a second valve core 322, and a second spring 323, where the second valve sleeve 321 is disposed in the second flow channel 132, the second valve core 322 is movably disposed in the second valve sleeve 321, two ends of the second spring 323 are connected to the second valve sleeve 321, and the other ends are connected to the second valve core 322, and the second valve core 322 is used to block the first flow channel 131 under the action of the second spring 323, or is used to compress the second spring 323 under the action of the fluid medium, so as to make the second flow channel 132 conductive.

In this embodiment, two ends of the second flow channel 132 are a liquid inlet and a liquid outlet, the liquid inlet is communicated with the first cavity 110, the liquid outlet is communicated with the second cavity 120, and the second valve core 322 is located between the liquid inlet and the liquid outlet to block the second flow channel 132, and the second spring 323 is in an original state at this time. When the fluid medium flows from the first cavity 110 to the second cavity 120, the fluid medium acts on the second valve core 322 and drives the second valve core 322 to compress the second spring 323 until the second valve core 322 is brought to the liquid outlet, so that the second flow channel 132 is conducted. After the fluid medium stops flowing, the second spring 323 generates elastic restoring force to drive the second valve core 322 to move between the liquid inlet and the liquid outlet again so as to block the second flow channel 132.

It should be noted that, the first spring 313 and the second spring 323 may be spring springs with different stiffness coefficients, so as to obtain different pressure adjustment coefficients, and the structures of the first pressure regulating valve 310 and the second pressure regulating valve 320 are identical, which is not described herein.

Further, the first pressure regulating valve 310 further includes a first adjusting bolt 314 and a first adjusting nut 315, one end of the first adjusting bolt 314 is connected to the first valve sleeve 311, and the other end is fixedly matched with the first adjusting nut 315.

In the present embodiment, the position of the first adjusting bolt 314 can be adjusted by turning the first adjusting nut 315, so as to adjust the position of the first valve sleeve 311 in the first flow channel 131, thereby adjusting the position of the valve core in the first flow channel 131. Thus, by varying the screwing depth of the first adjusting bolt 314, different set pressures of the first pressure adjusting valve 310 can be obtained, thereby obtaining different damping effects.

Similarly, the second pressure regulating valve 320 further includes a second adjusting bolt 324 and a second adjusting nut 325, wherein one end of the second adjusting bolt 324 is connected to the second valve sleeve 321, and the other end is fixedly engaged with the second adjusting nut 325.

In this embodiment, the position of the second adjusting bolt 324 is adjustable by turning the second adjusting nut 325, thereby adjusting the position of the second valve sleeve 321 within the second flow channel 132 and thus the position of the valve spool within the second flow channel 132. Thus, by varying the screwing depth of the second adjusting bolt 324, different set pressures of the second pressure regulating valve 320 can be obtained, thereby obtaining different damping effects.

Further, the cylinder tube 100 is provided with a pressure regulating portion 140, and the first flow passage 131, the second flow passage 132, the first pressure regulating valve 310, the second pressure regulating valve 320, the first regulating bolt 314, the first regulating nut 315, the second regulating bolt 324, and the second regulating nut 325 are all provided in the pressure regulating portion 140.

In this embodiment, the pressure regulating portion 140 is further provided with a process hole 141, the process hole 141 is plugged by a plug 150, and the plug 150 is a process piece. Specifically, the number of through holes 410 and plugs 150 is four, and four plugs 150 are installed in the four through holes 410 in a one-to-one correspondence, and are plugged by adopting a welding process.

Further, the double acting damping cylinder 10 also includes a spacer 400.

The piston member 200 includes a first plug body 210, a second plug body 220, and a piston rod 230, the partition member 400 is disposed in the cylinder barrel 100 to partition the cylinder barrel 100 into a first cavity 110 and a second cavity 120, the piston rod 230 movably penetrates through the partition member 400, the first plug body 210 is disposed in the first cavity 110 and connected to one end of the piston rod 230, and the second plug body 220 is disposed in the second cavity 120 and connected to the other end of the piston rod 230.

In this embodiment, the fluid medium is typically located in the cavity between the first plug 210 and the separator 400 and the cavity between the second plug 220 and the separator 400.

In detail, the partition 400 is provided with a through hole 410, the through hole 410 is used for the piston rod 230 to pass through, the inner wall of the through hole 410 is provided with a first ring groove 420, and the first ring groove 420 is used for installing the sealing ring 500;

likewise, the outer wall of the separator 400 is also annularly provided with a second annular groove 430, and the second annular groove 430 is used for mounting the seal ring 500.

In the present embodiment, the sealing performance of the separator 400 is improved by providing the sealing rings 500 at the first ring groove 420 and the second ring groove 430.

Further, the double acting damping cylinder 10 also includes a mount 600.

The outer wall of the partition 400 is further provided with a third ring groove 440, and the number of the second ring grooves 430 is two, the two second ring grooves 430 are located at two sides of the third ring groove 440, and the fixing member 600 is disposed on the cylinder 100 and fixedly engaged with the third ring groove 440.

In the present embodiment, the fixing member 600 is inserted into the cylinder 100 perpendicular to the axial direction of the cylinder 100 and is inserted into the third ring groove 440 to be fixedly engaged with the third ring groove 440, thereby fixing the partition member 400 and preventing the partition member 400 from moving relative to the cylinder 100.

Specifically, the fixing member 600 is a bolt, which is a common standard member, which is installed in a hole in the side of the pressure regulating part 140 and which simultaneously passes through the third ring groove 440 of the partition 400 to fix the partition 400.

Further, the first plug body 210 is provided with a fourth ring groove 211, the second plug body 220 is provided with a fifth ring groove 221, and both the fourth ring groove 211 and the fifth ring groove 221 are used for installing the sealing ring 500.

Further, the double-acting damping cylinder 10 further includes a wire rope 700 and a joint 800, the joint 800 is disposed at an end of the piston member 200, the end of the piston member 200 is connected to the wire rope 700 through the joint 800, and the wire rope 700 is used for driving the piston member 200 to move relative to the cylinder tube 100 along the extending directions of the two cavities.

In this embodiment, the cable 700 and the connector 800 are mechanically crimped, the connector 800 is provided with threads on the side remote from the cable 700, and the two connectors 800 are respectively screwed with the first plug body 210 and the second plug body 220.

Further, end caps 900 are further disposed at two ends of the cylinder 100, and the end caps 900 are in threaded connection with the cylinder 100. The steel cable 700 extends into the first cavity 110 through a round hole in the middle of the end cover 900 and is connected with the first plug 210 through the connector 800, or extends into the second cavity 120 and is connected with the second plug 220 through the connector 800.

In summary, the embodiment of the present invention provides a dual-acting damping cylinder 10, wherein the cylinder 100 is divided into a first cavity 110 and a second cavity 120 by the partition 400, and the piston member 200 is driven by the steel cable 700; as shown in fig. 6, when the wire rope 700 pulls the piston member 200 from the first chamber 110 to the second chamber 120, i.e., to the right, the fluid medium passes through the second flow passage 132 and acts on the second pressure regulating valve 320, and the fluid medium flows in the direction a-b-c-d to the second chamber 120 of the cylinder 100; similarly, when the wire rope 700 pulls the piston member 200 from the second chamber 120 to the first chamber 110, i.e., to the left, the fluid medium passes through the first flow passage 131 and acts on the first pressure regulating valve 310, and the fluid medium flows in the directions e→f→g→h to the first chamber 110 of the cylinder tube 100.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A double acting damping cylinder, comprising:

the cylinder barrel (100), the cylinder barrel (100) is provided with a first cavity (110), a second cavity (120) and a buffer flow channel (130), two ends of the buffer flow channel (130) are respectively communicated with the first cavity (110) and the second cavity (120), and the first cavity (110) and the second cavity (120) are used for accommodating fluid media;

the piston piece (200) is movably arranged in the first cavity (110) and the second cavity (120) so as to drive the fluid medium to flow between the first cavity (110) and the second cavity (120).

2. The double-acting damping cylinder according to claim 1, further comprising a valve body (300), the valve body (300) being arranged in the buffer flow channel (130), the valve body (300) being configured to conduct the buffer flow channel (130) in case the fluid medium flows from the first cavity (110) to the second cavity (120) or from the second cavity (120) to the first cavity (110).

3. The double acting damping cylinder of claim 2, wherein the buffer flow passage (130) comprises a first flow passage (131) and a second flow passage (132), and the valve body (300) comprises a first pressure regulating valve (310) and a second pressure regulating valve (320);

the first pressure regulating valve (310) is arranged on the first flow passage (131), and the first pressure regulating valve (310) is used for conducting the first flow passage (131) when the fluid medium flows from the second cavity (120) to the first cavity (110);

the second pressure regulating valve (320) is disposed in the second flow passage (132), and the second pressure regulating valve (320) is configured to allow the second flow passage (132) to be connected when the fluid medium flows from the first chamber (110) to the second chamber (120).

4. A double acting damping cylinder according to claim 3, wherein the first pressure regulating valve (310) comprises a first valve sleeve (311), a first valve core (312) and a first spring (313), the first valve sleeve (311) is arranged in the first flow channel (131), the first valve core (312) is movably arranged in the first valve sleeve (311), one end of the first spring (313) is connected with the first valve sleeve (311), the other end is connected with the first valve core (312), the first valve core (312) is used for blocking the first flow channel (131) under the action of the first spring (313), or is used for compressing the first spring (313) under the action of the fluid medium so as to lead the first flow channel (131) to be conducted;

and/or, the second pressure regulating valve (320) comprises a second valve sleeve (321), a second valve core (322) and a second spring (323), the second valve sleeve (321) is arranged in the second flow channel (132), the second valve core (322) is movably arranged in the second valve sleeve (321), two ends of the second spring (323) are connected with the second valve sleeve (321), the other ends of the second spring (323) are connected with the second valve core (322), and the second valve core (322) is used for blocking the first flow channel (131) under the action of the second spring (323) or is used for compressing the second spring (323) under the action of a fluid medium so as to conduct the second flow channel (132).

5. The double acting damping cylinder according to claim 4, wherein the first pressure regulating valve (310) further comprises a first adjusting bolt (314) and a first adjusting nut (315), one end of the first adjusting bolt (314) is connected with the first valve sleeve (311), and the other end is fixedly matched with the first adjusting nut (315);

and/or, the second pressure regulating valve (320) further comprises a second regulating bolt (324) and a second regulating nut (325), one end of the second regulating bolt (324) is connected with the second valve sleeve (321), and the other end of the second regulating bolt is fixedly matched with the second regulating nut (325).

6. A double-acting damping cylinder according to claim 3, characterized in that the cylinder (100) is provided with a pressure regulating portion (140), the first flow passage (131) and the second flow passage (132) being both provided in the pressure regulating portion (140).

7. The double-acting damping cylinder according to claim 1, further comprising a partition (400), wherein the piston member (200) comprises a first plug body (210), a second plug body (220) and a piston rod (230), wherein the partition (400) is disposed in the cylinder (100) to partition the cylinder (100) into the first cavity (110) and the second cavity (120), wherein the piston rod (230) movably penetrates through the partition (400), wherein the first plug body (210) is disposed in the first cavity (110) and is connected with one end of the piston rod (230), and wherein the second plug body (220) is disposed in the second cavity (120) and is connected with the other end of the piston rod (230).

8. The double-acting damping cylinder according to claim 7, wherein the partition (400) is provided with a through hole (410), the through hole (410) is used for the piston rod (230) to pass through, the inner wall of the through hole (410) is provided with a first annular groove (420), and the first annular groove (420) is used for installing a sealing ring (500);

and/or, the outer wall of the partition (400) is also provided with a second annular groove (430) in a ring manner, and the second annular groove (430) is used for installing the sealing ring (500).

9. The double-acting damping cylinder of claim 8, further comprising a mount (600);

the outer wall of the partition piece (400) is further provided with a third annular groove (440), the number of the second annular grooves (430) is two, the two second annular grooves (430) are located on two sides of the third annular groove (440), and the fixing piece (600) is arranged on the cylinder barrel (100) and is fixedly matched with the third annular groove (440).

10. The double-acting damping cylinder according to claim 7, wherein the first plug body (210) is provided with a fourth ring groove (211), the second plug body (220) is provided with a fifth ring groove (221), and both the fourth ring groove (211) and the fifth ring groove (221) are used for installing a sealing ring (500).