Double-acting flexible piston cylinder with a cushioning mechanism

Abstract

The application relates to a double-acting flexible piston cylinder with a buffering mechanism, which comprises a cylinder mechanism, a piston mechanism and a buffering mechanism, the buffering mechanism comprises a buffering cylinder fixed with a front end cover, a buffering ring arranged in the buffering cylinder and a ratchet transmission ring arranged in the buffering ring, a columnar convex part which is engaged with a spiral groove is arranged in the middle of the inner wall of the ratchet transmission ring along the circumferential direction, pawls for driving the buffering ring to rotate in one direction are arranged on the outer wall of the ratchet transmission ring, rotating blades for buffering are arranged on the outer wall of the buffering ring along the circumferential direction, and the two ends of the buffering ring are rotationally connected with the buffering cylinder through centripetal thrust ball bearings. According to the above technical scheme, when the piston rod is stretched out, the cylinder can realize buffering through the rotating blades, and when the piston rod is retracted, the cylinder can realize buffering through the traction of the double-layer skin, and has the advantages of simple structure, accurate transmission, small energy loss and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of piston cylinder, in particular to a double-acting flexible piston cylinder with a buffer mechanism. BACKGROUND

[0002] Piston cylinders are widely used in various industrial production lines for transmitting motion, positioning and clamping due to their simple principle and structure, moderate cost and output force, and convenient installation and maintenance. Traditional piston cylinders mainly use rigid pistons, which cause large energy loss and small output force during operation due to the contact and friction between the piston and the inner wall of the cylinder. Flexible piston cylinders use flexible skin materials and utilize air pressure and skin elasticity to drive the movement of workpieces, which has the advantages of large output force and small energy loss compared with traditional rigid piston cylinders. However, flexible piston cylinders are currently mainly single-acting, and double-acting flexible piston cylinders are rarely seen, which is not conducive to industrial applications. In addition, at the end of the operation process of the cylinder, a buffer mechanism is needed to eliminate the energy of the workpiece movement and avoid damage to the cylinder and the workpiece. Currently, traditional buffer devices mainly use hydraulic, rubber or gas for buffering, which has the characteristics of large end-of-buffering force and poor self-adaptive effect. In contrast, the viscosity coefficient of non-Newtonian fluid changes with the movement speed, which can generate a resistance that changes with the movement speed. Accordingly, designing a double-acting flexible piston cylinder and applying non-Newtonian fluid for buffering will help to improve the shortcomings of the traditional cylinder and improve the performance of the cylinder. SUMMARY

[0003] The present application aims to provide a double-acting flexible piston cylinder with a buffer mechanism, which can supply air to both sides of the piston alternately to realize double-acting of the cylinder, and also reduce energy loss of the cylinder.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: a cylinder body mechanism, a piston mechanism and a buffer mechanism are included, the cylinder body mechanism includes a cylinder barrel, and front and rear end covers are fixed at both ends of the cylinder barrel;

[0005] The piston mechanism includes a piston arranged in the cylinder barrel, a piston rod is arranged on the end face of the piston away from the rear end cover, a sleeve ring is arranged on the piston rod, the sleeve ring is fixed on the piston rod through stop nuts at both ends of the sleeve ring, helical protrusions are uniformly distributed on the outer surface of the sleeve ring in the circumferential direction, the helical protrusions are arranged in the axial direction of the piston rod, and helical grooves are formed between adjacent helical protrusions;

[0006] The piston rod is sleeved with a telescopic double-layer skin between the piston and the front end cover, the two ends of the double-layer skin are fixed with the piston and the front end cover respectively, the piston, the cylinder and the rear end cover form a first cavity, the piston, the cylinder and the outer surface of the double-layer skin form a second cavity which is communicated with the first cavity, the front end cover is provided with a front air inlet hole which is communicated with the middle cavity of the double-layer skin, and the rear end cover is provided with a rear air inlet hole which is communicated with the first cavity.

[0007] The buffer mechanism comprises a buffer cylinder fixed with the front end cover, a buffer ring arranged in the buffer cylinder and a ratchet transmission ring arranged in the buffer ring, the central axes of the buffer cylinder, the buffer ring, the ratchet transmission ring, the piston, the piston rod, the cylinder, the double-layer skin, the front end cover and the rear end cover are coincided, the middle part of the inner wall of the ratchet transmission ring is provided with a columnar protrusion part which is engaged with the spiral groove along the circumferential direction, the number of the columnar protrusion part is same as the number of the spiral protrusion, the outer wall of the ratchet transmission ring is provided with a pawl which drives the buffer ring to rotate in one direction, the outer wall of the buffer ring is provided with rotating blades which have a buffering effect along the circumferential direction, the two ends of the buffer ring are rotatably connected with the buffer cylinder through the centripetal thrust ball bearings, the outer side of the centripetal thrust ball bearings is provided with a Gley ring, and the fluid cavity which stores the buffer liquid is formed between the outer wall of the buffer ring and the inner wall of the buffer cylinder.

[0008] The sleeve ring and the stop nut close to the piston side are provided with an obstacle baffle, and the outer surface of the obstacle baffle is flush with the outer surface of the spiral protrusion.

[0009] The double-layer skin is in a bamboo joint type as a whole, comprises an inner skin and an outer skin, the middle cavity which is communicated with the front air inlet hole is formed between the inner skin and the outer skin, the inner wall of the inner skin is provided with an inner skeleton ring which is matched with the inner skin and has a supporting effect, the inner wall of the outer skin is provided with an outer skeleton ring which is matched with the outer skin and has a supporting effect, and the inner skeleton ring and the outer skeleton ring are provided with at least three.

[0010] The support rods which are arranged along the axial direction of the cylinder are arranged between the front end cover and the rear end cover, one end of the support rod is fixed with the rear end cover, the other end of the support rod penetrates through the front end cover and is fixed with the buffer cylinder, and the support rods are uniformly arranged in four groups.

[0011] The first annular groove which is matched with the cylinder is arranged on the rear end cover, the second annular groove which is matched with the cylinder is arranged on the front end cover, the third circular ring protrusion which is used for fixing the outer skin and the fourth circular ring protrusion which is used for fixing the inner skin are further arranged on the front end cover, and the first through hole which is used for the piston rod and the sleeve ring to pass through is arranged at the center of the front end cover.

[0012] The buffer cylinder is a split structure, comprising a front cylinder body and a rear cylinder body which are symmetrically arranged and combined together, the rear cylinder body is fixed with the front end cover, a convex circular table is arranged at the center of the inner side of the front cylinder body, a second through hole is arranged at the center of the circular table for the piston rod to pass out, the diameter of the second through hole is larger than the diameter of the piston rod, an annular groove for accommodating the gasket is formed in the side surface of the circular table, the inner ring of the radial thrust ball bearing is matched with the outer circumferential surface of the circular table, and the outer ring of the radial thrust ball bearing is matched with the inner wall of the buffer ring.

[0013] The rear cylinder body is provided with a liquid inlet communicated with the fluid cavity, the liquid inlet is provided with a screw plug matched therewith, and the buffer liquid in the fluid cavity is a non-Newtonian fluid.

[0014] The inner wall of the cylinder barrel is provided with a fixing rod along the axial direction, the fixing rod and the cylinder barrel are integrally formed, the side surface of the piston is provided with a limiting hole matched with the fixing rod in a clearance manner along the circumferential direction, and the side surface of the piston is further provided with a ventilation hole communicated with the first cavity and the second cavity along the circumferential direction.

[0015] The piston is provided with a blind hole matched with the piston rod at the center of the end surface away from the rear end cover, and the end surface is further provided with a first circular ring protrusion for fixing the outer skin and a second circular ring protrusion for fixing the inner skin.

[0016] As can be seen from the above technical solution, the air cylinder of the present application can realize buffering through the rotating vane when the piston rod extends outward, and can realize buffering through the traction of the double-layer skin when the piston rod retracts inward, and has the advantages of simple structure, accurate transmission and small energy loss. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0018] Figure 2 is a schematic diagram of the internal structure of the present application;

[0019] Figure 3 is a schematic diagram of the internal structure of the present application after removing the cylinder barrel and the buffer cylinder;

[0020] Figure 4 is a schematic diagram of the connection structure of the double-layer skin, the piston and the front end cover of the present application;

[0021] Figure 5 is Figure 4 the front view of the present application;

[0022] Figure 6 is Figure 5 the A-A sectional view of the present application;

[0023] Figure 7Fig. 1 is a structural schematic diagram of the piston mechanism of the present application;

[0024] Figure 8 Fig. 2 is a structural schematic diagram of the collar and the blocking piece of the present application;

[0025] Figure 9 Fig. 3 is a structural schematic diagram of the cylinder of the present application;

[0026] Figure 10 Fig. 4 is a structural schematic diagram of the piston of the present application;

[0027] Figure 11 Fig. 5 is a structural schematic diagram of the rear end cover of the present application;

[0028] Figure 12 Fig. 6 is a structural schematic diagram of the front end cover of the present application Figure 1 ;

[0029] Figure 13 Fig. 7 is a structural schematic diagram of the front end cover of the present application Figure 2 ;

[0030] Figure 14 Fig. 8 is a structural schematic diagram of the front cylinder body of the present application;

[0031] Figure 15 Fig. 9 is a front view of Figure 14 ;

[0032] Figure 16 Fig. 10 is a B-B sectional view of Figure 15 ;

[0033] Figure 17 Fig. 11 is a half-sectional schematic diagram of the buffer mechanism of the present application;

[0034] Figure 18 Fig. 12 is a structural schematic diagram of the buffer ring and the ratchet transmission ring of the present application;

[0035] Figure 19 Fig. 13 is a front view of Figure 18 ;

[0036] Figure 20 Fig. 14 is a left view of Figure 19 ;

[0037] Figure 21 Fig. 15 is a schematic diagram of the internal structure of the buffer mechanism of the present application after removing the buffer cylinder;

[0038] Figure 22 Fig. 16 is a use state diagram of the present application when the piston rod is retracted inwardly;

[0039] Figure 23 Fig. 17 is a use state diagram of the present application when the piston rod is extended outwardly.

[0040] The marks in the above drawings are: cylinder mechanism 1, cylinder barrel 11, fixed rod 111, front end cover 12, front air hole 121, second annular groove 122, third circular protrusion 123, fourth circular protrusion 124, first through hole 125, rear end cover 13, rear air hole 131, first annular groove 132, double-layer skin 14, inner skin 141, inner skeleton circular ring 1411, outer skin 142, outer skeleton circular ring 1421, support rod 15, piston mechanism 2, piston 21, limiting hole 211, air hole 212, blind hole 213, first circular protrusion 214, second circular protrusion 215, piston rod 22, collar 23, helical protrusion 231, helical groove 232, stop nut 24, blocking baffle 25, buffer mechanism 3, buffer cylinder 31, front cylinder body 311, circular table 3111, second through hole 3112, annular groove 3113, rear cylinder body 312, screw plug 3121, buffer ring 32, ratchet transmission ring 33, columnar protrusion part 331, pawl 332, rotating vane 321, radial thrust ball bearing 34, garter 35, first cavity A, second cavity B, intermediate cavity C, fluid cavity D. DETAILED DESCRIPTION

[0041] The application will be further described below in combination with the drawings:

[0042] As shown in Figure 1 , Figure 2 , Figure 3 , a double-acting flexible piston cylinder with a buffer mechanism comprises a cylinder mechanism 1, a piston mechanism 2 and a buffer mechanism 3. The cylinder mechanism 1 comprises a cylinder barrel 11, the two ends of the cylinder barrel 11 are respectively fixed with a front end cover 12 and a rear end cover 13, the rear end cover 13 is provided with a first annular groove 132 which is matched with the cylinder barrel 11, and the front end cover 12 is provided with a second annular groove 122 which is matched with the cylinder barrel 11.

[0043] As shown in Figure 7 , the piston mechanism 2 comprises a piston 21 arranged in the cylinder barrel 11, the piston 21 is provided with a piston rod 22 on the end face away from the rear end cover 13, that is, the piston 21 is provided with a blind hole 213 matched with the piston rod 22 at the center of the end face away from the rear end cover 13. The piston rod 22 between the piston 21 and the front end cover 12 is sleeved with an extensible double-layer skin 14, specifically, as shown in Figure 4 , Figure 5 , Figure 6As shown, the double-layered skin 14 is in a bamboo joint type as a whole, including an inner skin 141 and an outer skin 142, the inner wall of the inner skin 141 is provided with inner skeleton annular rings 1411 matched with the inner skin 141 and serving as supports, the inner wall of the outer skin 142 is provided with outer skeleton annular rings 1421 matched with the outer skin 142 and serving as supports, and the inner skeleton annular rings 1411 and the outer skeleton annular rings 1421 are both provided with at least three. In the embodiment, the double-layered skin 14 is a flexible skin made of thermoplastic polyurethane elastomer rubber material TPU, which has the characteristics of high tension, high pulling force, high toughness and aging resistance, and belongs to aviation materials, and the strong tension of the double-layered skin 14 ensures the movement of the piston 21 and the successful buffering of the cylinder.

[0044] The two ends of the double-layered skin 14 are fixed with the piston 21 and the front end cover 12 respectively, and specifically, as shown in Figure 12 、 Figure 13 shown, the front end cover 12 is provided with a third annular protrusion 123 for fixing the outer skin 142 and a fourth annular protrusion 124 for fixing the inner skin 141; the piston 21 is provided with a first annular protrusion 214 for fixing the outer skin 142 and a second annular protrusion 215 for fixing the inner skin 141 at the center of the end surface away from the rear end cover 13.

[0045] The piston 21, the cylinder barrel 11 and the rear end cover 13 form a first cavity A, the piston 21, the cylinder barrel 11 and the outer surface of the double-layered skin 14 form a second cavity B in communication with the first cavity A, the inner skin 141 and the outer skin 142 form an intermediate cavity C, and the front end cover 12 is provided with a front air inlet hole 121 in communication with the intermediate cavity C, as shown in FIG. 11, and the rear end cover 13 is provided with a rear air inlet hole 131 in communication with the first cavity A.

[0046] Further, as shown in Figure 8 , the piston rod 22 is provided with a sleeve ring 23, the sleeve ring 23 is fixed on the piston rod 22 through the stop nuts 24 at both ends of the sleeve ring 23, that is, the piston rod 22 is provided with a threaded section matched with the stop nuts 24, and the sleeve ring 23 is fixed at the corresponding position through the stop nuts 24. The outer surface of the sleeve ring 23 is uniformly distributed with helical protrusions 231 along the circumference thereof, the helical protrusions 231 are arranged along the axial direction of the piston rod 22, and adjacent helical protrusions 231 form helical grooves 232. In addition to being engaged with the columnar protrusion part 331 in the buffering mechanism 3, the helical grooves 232 also reduce the mass of the sleeve ring 23.

[0047] Further, the sleeve ring 23 and the stop nut 24 close to the piston 21 side are provided with a blocking baffle 25, the outer surface of the blocking baffle 25 is flush with the outer surface of the helical protrusion 231. The blocking baffle 25 can limit the extreme position of the columnar protrusion part 331 in the helical groove 232. The center of the front end cover 12 is provided with a first through hole 125 for the piston rod 22 and the sleeve ring 23 to pass through.

[0048] Further, the support rod 15 is arranged axially between the front end cover 12 and the rear end cover 13, one end of the support rod 15 is fixed with the rear end cover 13, and the other end of the support rod 15 penetrates the front end cover 12 and is fixed with the buffer cylinder 31, specifically, the other end of the support rod 15 penetrates the front end cover 12, the rear cylinder body 312, and the front cylinder body 311 in sequence and is fixed with the front cylinder body 311, which improves the sealing performance of the buffer cylinder 31. In the embodiment, the support rod 15 is arranged uniformly in four groups.

[0049] Further, as shown in Figure 9 , the inner wall of the cylinder barrel 11 is provided with a fixed rod 111 along the axial direction, and the fixed rod 111 is integrally formed with the cylinder barrel 11, as shown in Figure 10 , the side surface of the piston 21 is provided with a limiting hole 211 which is in clearance fit with the fixed rod 111 along the circumferential direction inwardly, and the side surface of the piston 21 is further provided with a vent hole 212 which communicates the first cavity A and the second cavity B along the circumferential direction inwardly, and the limiting hole 211 and the vent hole 212 are arranged in a spaced manner. The vent hole 212 can avoid excessive air pressure in the first cavity A.

[0050] As shown in Figures 17-21 , the buffer mechanism 3 includes the buffer cylinder 31 fixed with the front end cover 12, the buffer ring 32 arranged in the buffer cylinder 31, and the ratchet transmission ring 33 arranged in the buffer ring 32, and the center axes of the buffer cylinder 31, the buffer ring 32, the ratchet transmission ring 33, the piston 21, the piston rod 22, the cylinder barrel 11, the double-skin 14, the front end cover 12, and the rear end cover 13 are coincident. The inner wall of the ratchet transmission ring 33 is provided with a columnar protruding part 331 which is in mesh with the spiral groove 232 along the circumferential direction in the middle part, the number of the columnar protruding part 331 is the same as the number of the spiral protrusion 231, the outer wall of the ratchet transmission ring 33 is provided with a pawl 332 which drives the buffer ring 32 to rotate in one direction, the outer wall of the buffer ring 32 is provided with a rotating vane 321 which has a buffering effect along the circumferential direction, the two ends of the buffer ring 32 are rotatably connected with the buffer cylinder 31 through the radial thrust ball bearing 34, the outer side of the radial thrust ball bearing 34 is provided with a Gley ring 35, and the fluid cavity D which stores the buffer solution is formed between the outer wall of the buffer ring 32 and the inner wall of the buffer cylinder 31.

[0051] Further, the buffer cylinder 31 is a split structure, including the front cylinder body 311 and the rear cylinder body 312 which are symmetrically arranged and combined together, and the rear cylinder body 312 is fixed with the front end cover 12. The structure of the front cylinder body 311 is taken as an example for description as follows: Figure 14 , Figure 15 , Figure 16As shown, a raised frustum 3111 is provided at the center of the inner side of the front cylinder block 311. A second through hole 3112 for the piston rod 22 to pass through is provided at the center of the frustum 3111. The diameter of the second through hole 3112 is larger than the diameter of the piston rod 22. An annular groove 3113 is formed inwardly on the side of the frustum 3111 to accommodate the Glyd ring 35. The inner ring of the radial thrust ball bearing 34 mates with the outer circumferential surface of the frustum 3111, and the outer ring of the radial thrust ball bearing 34 mates with the inner wall of the buffer ring 32. The Glyd ring 35 is used to seal the radial thrust ball bearing 34, preventing buffer solution with a cushioning effect from entering the radial thrust ball bearing 34 and causing wear or other adverse effects, thus affecting its use. Simultaneously, the Glyd ring 35 is fixed between the buffer ring 32 and the front cylinder block 311, serving to seal and reduce friction, and also allowing for better assembly between the buffer ring 32 and the inner wall of the front cylinder block 311.

[0052] The rear cylinder 312 is provided with an inlet that communicates with the fluid chamber D, and a screw plug 3121 that matches the inlet is provided at the inlet. The buffer solution in the fluid chamber D is a non-Newtonian fluid.

[0053] The working principle and process of this invention are as follows:

[0054] 1. The outward extension of the piston rod is as follows:

[0055] like Figure 23 As shown, a buffer solution is injected into the buffer cylinder. An air pump pumps gas through the rear vent into the first and second chambers inside the cylinder, creating high pressure outside the double-layer skin. Under the pressure difference between the inside and outside, the double-layer skin deforms, and the tension generated by the deformation acts on the piston output. Under the pressure difference between the inside and outside of the double-layer skin, the piston drives the piston rod to move axially along the cylinder and output force. When the collar on the piston rod moves to a certain position with the piston rod, the spiral groove engages with the columnar protrusion in the ratchet drive ring, thereby driving the ratchet drive ring to rotate. The ratchet drive ring can drive the buffer ring to rotate unidirectionally through its pawl. The rotating blades on the buffer ring will rotate accordingly and stir the buffer solution in the buffer cylinder. The rotating blades will then hinder the rotation of the buffer ring, and the buffering force will be transmitted to the piston rod through the columnar protrusion on the ratchet drive ring, thus hindering the piston's movement and completing the buffering of the piston rod's outward extension.

[0056] The buffering effect of the piston rod extending outward utilizes the properties of a buffering fluid. When subjected to force, the viscosity of the buffering fluid increases with the increase of speed, which can reduce the speed of the rotating blades and ultimately achieve buffering of the piston rod extending outward. At the same time, it can also achieve adaptive adjustment of the buffer. Based on the characteristics of the fluid, a non-Newtonian fluid should be selected as the buffering fluid.

[0057] 2. The inward retraction movement of the piston rod is as follows:

[0058] As shown in Figure 22 , the air pump pumps air through the front vent hole into the intermediate cavity between the double-layer skin, input pressure, drive the piston movement, the piston rod produces inward retraction movement, the cylindrical convex part passes through the spiral groove, because the ratchet transmission ring can only drive the buffer ring to rotate in one direction, so at this time the buffer ring will not rotate, reducing the friction resistance generated during movement. Because the double-layer skin has elastic potential energy, it can provide a buffer force for the inward retraction of the piston rod, until the piston moves to the elastic limit position of the skin, completing the buffer of the inward retraction movement of the piston rod.

[0059] The beneficial effects of the present application are:

[0060] 1. Compared with the traditional rigid piston, the flexible piston cylinder of the present application has a small contact area between the piston and the inner wall of the cylinder, and the friction during movement is significantly reduced, so the energy loss during movement is small and the output force is large. In addition, the material cost and manufacturing precision requirement of the flexible piston cylinder is low, which is conducive to reducing the production cost of the cylinder.

[0061] 2. Compared with the existing single-acting flexible piston cylinder, the double-acting flexible piston cylinder of the present application can realize bidirectional precise positioning, has high precision and small energy loss during return, and has stronger engineering adaptability and better meets the needs of industrial applications.

[0062] 3. The limiting hole on the flexible piston cooperates with the gap between the fixed rod inside the cylinder, which increases the stability of the flexible piston during movement, reduces the friction during movement of the cylinder, and reduces the vibration and noise generated by friction.

[0063] 4. The cylinder buffer device based on non-Newtonian fluid designed in the present application utilizes the characteristic that the viscosity of non-Newtonian fluid increases with the increase of relative movement speed, realizes the self-adaptive buffering characteristics of large buffering resistance at high speed and small buffering resistance at low speed, and can produce more efficient buffering compared with traditional buffering devices. In addition, the pawl mechanism designed in the present application can drive the buffer ring to generate buffering resistance with the non-Newtonian fluid when the piston rod extends outward, and slide with the buffer ring when it retracts, avoiding fluid resistance and significantly reducing the energy loss during the return movement of the cylinder.

[0064] The above-described embodiments are merely preferred embodiments of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A double-acting flexible piston cylinder with a buffer mechanism, characterized in that: It includes a cylinder mechanism (1), a piston mechanism (2) and a buffer mechanism (3). The cylinder mechanism (1) includes a cylinder (11), and a front end cap (12) and a rear end cap (13) are fixed at both ends of the cylinder (11). The piston mechanism (2) includes a piston (21) disposed in a cylinder (11). A piston rod (22) is provided on the end face of the piston (21) away from the rear end cover (13). A collar (23) is provided on the piston rod (22). The collar (23) is fixed to the piston rod (22) by the stop nuts (24) at both ends of the collar (23). The outer surface of the collar (23) is evenly distributed with spiral protrusions (231) along its circumference. The spiral protrusions (231) are arranged along the axial direction of the piston rod (22). A spiral groove (232) is formed between adjacent spiral protrusions (231). A retractable double-layer skin (14) is loosely fitted on the piston rod (22) between the piston (21) and the front end cover (12). The two ends of the double-layer skin (14) are fixed to the piston (21) and the front end cover (12) respectively. A first cavity is formed between the piston (21), the cylinder (11) and the rear end cover (13). A second cavity is formed between the outer surfaces of the piston (21), the cylinder (11) and the double-layer skin (14) and communicates with the first cavity. The front end cover (12) is provided with a front air hole (121) that communicates with the middle cavity of the double-layer skin (14). The rear end cover (13) is provided with a rear air hole (131) that communicates with the first cavity. The buffer mechanism (3) includes a buffer cylinder (31) fixed to the front end cover (12), a buffer ring (32) placed inside the buffer cylinder (31), and a ratchet drive ring (33) placed inside the buffer ring (32). The central axes of the buffer cylinder (31), buffer ring (32), ratchet drive ring (33), piston (21), piston rod (22), cylinder (11), double-layer skin (14), front end cover (12), and rear end cover (13) are aligned. The inner wall of the ratchet drive ring (33) has a columnar protrusion (331) that engages with a spiral groove (232) along its circumference. The number of columnar protrusions (331) is the same as the number of spiral protrusions (231). The outer wall of the ratchet drive ring (33) is provided with a pawl (332) that drives the buffer ring (32) to rotate in one direction. The outer wall of the buffer ring (32) is provided with a rotating blade (321) that plays a buffering role along its circumference. The two ends of the buffer ring (32) are respectively rotatably connected to the buffer cylinder (31) through a radial thrust ball bearing (34). A glypto ring (35) is provided on the outer side of the radial thrust ball bearing (34). A fluid cavity for storing buffer solution is formed between the outer wall of the buffer ring (32) and the inner wall of the buffer cylinder (31).

2. The double-acting flexible piston cylinder with a buffer mechanism according to claim 1, characterized in that: A baffle plate (25) is provided between the collar (23) and the stop nut (24) near the piston (21), and the outer surface of the baffle plate (25) is flush with the outer surface of the spiral protrusion (231).

3. The double-acting flexible piston cylinder with a buffer mechanism according to claim 1, characterized in that: The double-layer skin (14) is generally bamboo-shaped, including an inner skin (141) and an outer skin (142). An intermediate cavity is formed between the inner skin (141) and the outer skin (142) that communicates with the front air hole (121). The inner wall of the inner skin (141) is provided with an inner skeleton ring (1411) that cooperates with it and provides support. The inner wall of the outer skin (142) is provided with an outer skeleton ring (1421) that cooperates with it and provides support. At least three inner skeleton rings (1411) and outer skeleton rings (1421) are provided.

4. The double-acting flexible piston cylinder with a buffer mechanism according to claim 1, characterized in that: A support rod (15) is provided between the front cover (12) and the rear cover (13) along the axial direction of the cylinder (11). One end of the support rod (15) is fixed to the rear cover (13), and the other end of the support rod (15) passes through the front cover (12) and is fixed to the buffer cylinder (31). Four sets of support rods (15) are evenly arranged.

5. The double-acting flexible piston cylinder with a buffer mechanism according to claim 1, characterized in that: The rear end cover (13) is provided with a first annular groove (132) that is fitted to the cylinder (11), the front end cover (12) is provided with a second annular groove (122) that is fitted to the cylinder (11), the front end cover (12) is also provided with a third annular protrusion (123) for fixing the outer skin (142) and a fourth annular protrusion (124) for fixing the inner skin (141), and a first through hole (125) for the piston rod (22) and the collar (23) to pass through is provided at the center of the front end cover (12).

6. The double-acting flexible piston cylinder with a buffer mechanism according to claim 1, characterized in that: The buffer cylinder (31) is a split structure, including a front cylinder (311) and a rear cylinder (312) that are symmetrically arranged and joined together. The rear cylinder (312) is fixed to the front end cover (12). A raised truncated cone (3111) is provided at the center of the inner side of the front cylinder (311). A second through hole (3112) for the piston rod (22) to pass through is provided at the center of the truncated cone (3111). The diameter of the second through hole (3112) is larger than the diameter of the piston rod (22). The side of the truncated cone (3111) forms an annular groove (3113) for accommodating the glyph (35) inward. The inner ring of the radial thrust ball bearing (34) is engaged with the outer circumferential surface of the truncated cone (3111). The outer ring of the radial thrust ball bearing (34) is engaged with the inner wall of the buffer ring (32).

7. The double-acting flexible piston cylinder with a buffer mechanism according to claim 6, characterized in that: The rear cylinder (312) is provided with an inlet that communicates with the fluid chamber, and a screw plug (3121) that cooperates with the inlet is provided at the inlet. The buffer solution in the fluid chamber is a non-Newtonian fluid.

8. The double-acting flexible piston cylinder with a buffer mechanism according to claim 1, characterized in that: The inner wall of the cylinder (11) is provided with a fixing rod (111) along its axial direction. The fixing rod (111) and the cylinder (11) are integrally formed. The side of the piston (21) is provided with a limiting hole (211) that forms a clearance fit with the fixing rod (111) along the circumferential direction. The side of the piston (21) is also provided with a vent hole (212) that connects the first cavity and the second cavity along the circumferential direction. The limiting hole (211) and the vent hole (212) are arranged at intervals.

9. The double-acting flexible piston cylinder with a buffer mechanism according to claim 1, characterized in that: The piston (21) has a blind hole (213) at the center of its end face away from the rear end cover (13) that cooperates with the piston rod (22). The end face also has a first annular protrusion (214) for fixing the outer skin (142) and a second annular protrusion (215) for fixing the inner skin (141).

Images