A bidirectional buffer forward and backward oil cylinder

Abstract

The present application relates to a bidirectional buffering forward and backward oil cylinder, which belongs to the technical field of oil cylinder devices, and comprises a cylinder barrel, a piston rod and a buffer member located in the cylinder barrel and connected to the piston rod; the buffer member comprises a first buffer portion and a second buffer portion and a sealing portion located between the first buffer portion and the second buffer portion, the first buffer portion has a first buffer outer wall arranged obliquely, the first buffer outer wall and the inner wall of the cylinder barrel forming a first buffer cavity, the second buffer portion has a second buffer outer wall arranged obliquely, the second buffer outer wall and the inner wall of the cylinder barrel forming a second buffer cavity, the present application has the effect of being able to buffer the piston rod in the oil cylinder while reducing the precision requirements for the manufacture of the oil cylinder.

Description

Technical Field

[0001] The present application relates to the field of oil cylinder devices, and in particular to a bidirectional buffer forward and backward oil cylinder. Background Art

[0002] Currently, in industrial production, oil cylinders are usually used as driving components to drive other components to perform linear reciprocating motion.

[0003] A hydraulic cylinder consists of a barrel for holding oil, a piston rod that slides through the cylinder, and an end cap fixedly connected to the piston rod. The end cap has an oil hole for receiving oil from the hydraulic device. As the piston rod moves toward the end cap, inertia prevents it from slowing down suddenly. This causes the end of the piston rod closest to the end cap to strike the end cap, generating a loud noise and potentially damaging the end cap.

[0004] To reduce the impact of the piston rod on the end cap, a related art technique employs a protrusion on the end of the piston rod near the end cap. The end cap has a groove on its upper surface that allows the protrusion to slide through and communicate with the inner cavity of the cylinder. When the protrusion fits into the groove, a buffer gap is created between the protrusion and the groove wall for the oil to flow through. The narrow buffer gap increases the oil return resistance experienced by the piston rod, thereby decelerating the piston rod.

[0005] Regarding the related technologies mentioned above, the inventor believes that in the above technical scheme, in order to make the oil cylinder have a good buffering effect, during the buffering process of the piston rod, the buffering space between the protrusion and the groove wall needs to be relatively small. During the processing of the protrusion and the groove, there may be eccentricity between the protrusion and the groove, so that the axes of the protrusion and the groove are not on the same straight line, which may cause friction loss between the protrusion and the groove wall, and at the same time affect the buffering effect. When the eccentricity of the protrusion and the groove is large, the protrusion cannot enter the groove and directly hits the end cover, and cannot play a buffering effect. Summary of the Invention

[0006] In order to cushion the piston rod in the cylinder while reducing the precision requirements for cylinder manufacturing, the present application provides a bidirectional buffering forward and backward movement cylinder.

[0007] The bidirectional buffer forward and backward oil cylinder provided in this application adopts the following technical solution:

[0008] A bidirectional buffer forward and backward oil cylinder comprises a cylinder barrel, a piston rod slidably disposed in the cylinder barrel, and a buffer member disposed in the cylinder barrel and connected to the piston rod, wherein a first oil hole and a second oil hole are formed on an outer wall of the cylinder barrel;

[0009] The piston rod has a deceleration buffer section. When the piston rod enters the deceleration buffer section, the flow rate of oil entering the first oil hole or the second oil hole is reduced.

[0010] By adopting the above technical solution, when the piston rod is buffered, the flow rate of the oil in the first oil hole or the second oil hole is reduced. Since the cross-sectional area of the cylinder along its length direction remains unchanged, the moving speed of the piston rod in the cylinder is reduced.

[0011] By arranging the buffer parts inside the cylinder, there is no need to produce the end cover during the buffer part processing, so there is no need to consider whether the protrusion on the piston rod can be aligned with the groove on the end cover. While reducing production costs, it also reduces the requirements for precise matching of internal parts of the cylinder, thereby increasing the production speed of the cylinder.

[0012] Optionally, the buffer member includes a first buffer portion, a second buffer portion, and a sealing portion located between the first buffer portion and the second buffer portion, wherein the sealing portion divides the inner cavity of the cylinder into two relatively sealed cavities;

[0013] The deceleration buffer section includes a contraction buffer section and an extension buffer section. The first buffer portion acts on the contraction buffer section and corresponds to the first oil hole. The second buffer portion acts on the extension buffer section and corresponds to the second oil hole.

[0014] By adopting the above technical solution, by providing the first buffer part and the second buffer part, the buffer member can provide two-way buffering for the piston rod, so that both ends of the cylinder barrel are not easily damaged by impact due to excessive speed of the piston rod when contacting the piston rod, thereby improving the service life of the oil cylinder;

[0015] Optionally, the first buffer portion has a first buffer outer wall, and the first buffer outer wall and the inner wall of the cylinder form a first buffer cavity. When the buffer member is in the contraction buffer section, the first buffer cavity is communicated with the first oil hole, and the first buffer outer wall gradually approaches the inner cavity wall of the cylinder from an end away from the second buffer portion to an end close to the second buffer portion along the length direction of the cylinder.

[0016] The second buffer portion has a second buffer outer wall, which forms a second buffer cavity with the inner wall of the cylinder. When the buffer component is in the process of extending the buffer section, the second buffer cavity is connected to the second oil hole. The cross-sectional area of the first buffer outer wall along the length direction of the cylinder gradually approaches the inner cavity wall of the cylinder from the end away from the first buffer portion to the end close to the first buffer portion.

[0017] By adopting the above technical solution, when the piston rod is in the contraction buffer section, the first buffer outer wall gradually approaches the inner cavity wall of the cylinder from the end away from the second buffer part to the end close to the second buffer part along the length direction of the cylinder, so that the oil flow through the first oil hole gradually decreases, and the speed of the reduction of the oil amount in the cavity where the first buffer member is located gradually decreases. Since the cross-sectional area of the cylinder along its length direction is fixed, the speed of the length of the cavity where the first buffer member is located gradually decreases, and then the speed of the buffer member and the piston rod gradually decreases to achieve a deceleration and buffering effect. When the piston rod is in the process of extending the buffer section, the second buffer outer wall gradually approaches the inner cavity wall of the cylinder, thereby decelerating and buffering the process of the piston rod in the extension state. The gradual change in the cross-sectional area of the first buffer cavity and the second buffer cavity makes the deceleration and buffering process of the piston rod smoother, and makes the speed change of the mechanism connected to the piston rod transmission smoother, which is more in line with actual production needs.

[0018] Optionally, the first buffer outer wall and the second buffer outer wall are both inclined and arranged in a plane.

[0019] By adopting the above technical solution, during the processing of the buffer part, since the first buffer outer wall and the second buffer outer wall are both inclined and arranged in a plane, a cutting device can be used to directly cut the outer wall of the buffer part. Compared with setting the first buffer outer wall and the second buffer outer wall as a curved surface, this method facilitates the processing of the first buffer outer wall and the second buffer outer wall, and improves the production efficiency of the buffer part.

[0020] Optionally, the buffer is provided with a fixing hole for the end of the piston rod to pass through, and the end of the piston rod is provided with a fixing member for fixing the buffer on the piston rod, and the fixing member abuts against the side of the first buffer part away from the second buffer part.

[0021] By adopting the above technical solution, by inserting the end of the piston rod into the interior of the buffer and securing the buffer and piston rod with a fixing member, axial slippage between the buffer and piston rod is reduced, and the connection between the buffer and piston rod is more stable. Furthermore, by placing the buffer at the end of the piston, compared to placing the buffer in the middle or other part of the piston rod, the stroke of the piston rod's single reciprocating motion is increased, while the cylinder length and buffer distance are constant, thereby improving the utilization rate of the cylinder length. Furthermore, by providing a fixing hole in the buffer, material consumption for the buffer is reduced.

[0022] Optionally, a clearance groove for the end of the piston rod to pass through is formed on the first buffer portion, the end of the piston rod and the fixing member are embedded in the clearance groove, and the fixing member is in contact with the bottom of the clearance groove.

[0023] By adopting the above technical solution, by embedding the end of the fixing piece and the piston end into the fixing groove, the stroke of the piston rod in one reciprocating motion is further increased under the condition that the length of the cylinder and the buffer distance are constant, thereby improving the utilization rate of the cylinder length.

[0024] Optionally, the piston rod includes a rod body and a fixing rod connected to one end of the rod body, the diameter of the fixing rod is smaller than the rod body, the buffer component is provided with a connecting hole connected to the fixing hole and for the rod body to be embedded, the fixing rod is passed through the fixing hole and the fixing component and is threadedly connected to the fixing component.

[0025] By adopting the above technical solution, the cross-sectional area of the fixing hole along its length direction is smaller than the cross-sectional area along the length direction of the connecting hole and the length direction of the evacuation groove, which further makes it difficult for the buffer to slide axially on the piston rod, thereby making the connection between the piston rod and the buffer more stable; at the same time, the fixing member is threadedly connected to the fixing rod, which makes it more convenient to fix and install the piston rod and the buffer; further, when the cross-sectional area of the cylinder along its length direction and the rod body along its length direction are constant, by setting a fixing rod with a radius smaller than the rod body, a certain evacuation space is provided for the threaded connection of the fixing member on the fixing rod, so that the cross-sectional area of the evacuation groove along its length direction can accommodate the fixing member.

[0026] Optionally, an end face of the fixing rod away from the rod body and an end face of the first buffer portion away from the second buffer portion are in the same plane. When the contraction stroke of the buffer component is completed, an end face of the first buffer portion located inside the cylinder and an end face of the fixing rod away from the rod body are simultaneously in contact with the cavity wall of the end of the cylinder.

[0027] By adopting the above technical solution, by placing the end face of the fixing rod away from the rod body and the end face of the first buffer part away from the second buffer part in the same plane, the contact area between the buffer part and the piston rod and the inner wall of the cylinder end is increased. Under the condition of a certain pressure, the pressure between the buffer part and the piston rod and the inner wall of the cylinder is reduced, thereby making the inner wall of the cylinder less susceptible to damage.

[0028] Optionally, the sealing portion is arranged in an annular shape, and the circumferential outer side wall of the sealing portion abuts against the cavity wall inside the cylinder, a sealing ring groove is opened on the sealing portion, and a sealing member is arranged in the sealing ring groove.

[0029] By adopting the above technical solution, the sealing between the rodless chamber and the rod chamber is increased, making it difficult for the oil between the rod chamber and the rodless chamber to flow into each other, thereby maintaining the pressure difference between the rod chamber and the rodless chamber, allowing the piston rod to move back and forth better in the cavity inside the cylinder.

[0030] Optionally, at least one elastic sheet is provided on the buffer component, and when deceleration buffering is completed, the elastic sheet is located below the first oil hole or the second oil hole.

[0031] By adopting the above technical solution, when the elastic sheet is not provided, when the deceleration buffer of the piston rod is completed, the oil in the oil pressure device enters the cylinder through the first oil hole or the second oil hole. Since the channel between the first buffer chamber and the first oil hole or the channel between the second buffer chamber and the second oil hole is smaller at this time, the flow rate of the oil entering the cylinder is smaller, thereby reducing the starting speed of the piston rod; by providing the elastic sheet, since the oil pressure of the oil in the first oil hole or the second oil hole is larger, the oil squeezes the elastic sheet, causing the elastic sheet to contract to increase the flow channel, thereby increasing the flow rate of the oil entering the cylinder, thereby increasing the starting speed of the piston rod.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. By placing the buffer inside the cylinder, there is no need to produce the end cover during the production of the cylinder. At the same time, the requirement for the buffer's precision is reduced, making the production of the buffer more convenient.

[0034] 2. By gradually reducing the cross-sectional areas of the first and second buffer chambers, the speed change of the piston rod is more moderate, which is more in line with actual production needs;

[0035] 3. By providing the elastic sheet, when the deceleration buffering of the piston is completed, the flow rate of the oil entering the cylinder from the first oil hole or the second oil hole is accelerated, thereby increasing the starting speed of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an overall schematic diagram of the oil cylinder of an embodiment of the present application.

[0037] Figure 2 It is an overall cross-sectional view of the oil cylinder of an embodiment of the present application.

[0038] Figure 3 This is a cross-sectional view of the piston rod and buffer member of an embodiment of the present application in the contraction buffer section.

[0039] Figure 4 is a cross-sectional view of a buffer member according to another embodiment.

[0040] Figure 5 It is a cross-sectional view of the end cover and the fixed bushing of an embodiment of the present application.

[0041] Explanation of the accompanying drawings: 1. Cylinder; 11. End cover; 111. Sliding hole; 112. Dust ring; 12. Rod cavity; 13. Rodless cavity; 14. First oil hole; 15. Second oil hole; 16. First oil pipe; 17. Second oil pipe; 18. Connecting pipe; 181. Hard pipe section; 182. Flexible pipe section; 2. Piston rod; 21. Rod body; 22. Fixed rod; 23. Fixed part; 3. Buffer; 31. First buffer part; 311. First buffer outer wall; 312. First buffer cavity; 32. Second buffer part; 321. Second buffer outer wall; 322. Second buffer cavity; 33. Sealing part; 34. Fixing hole; 35. Connecting hole; 36. Give way groove; 37. Sealing part; 38. First sealing ring; 39. Elastic sheet; 4. Fixed bushing; 41. Second sealing ring; 43. Step seal. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-5 This application is described in further detail.

[0043] The embodiment of the present application discloses a bidirectional buffer forward and backward movement oil cylinder.

[0044] Reference Figure 1 and Figure 2 The bidirectional buffer forward and backward oil cylinder includes a cylinder 1 with a cavity inside, a piston rod 2 and a buffer 3. The end of the cylinder 1 is provided with a sliding hole 111 for the piston rod 2 to slide through, and the buffer 3 is fixedly connected to the end of the piston rod 2 located inside the cylinder 1.

[0045] Reference Figure 2 and Figure 3 The buffer member 3 includes a first buffer portion 31, a second buffer portion 32, and a sealing portion 33 located between the first and second buffer portions 31 and 32. The sealing portion 33 divides the cavity inside the cylinder tube 1 into a rod cavity 12 and a rodless cavity 13. The rod cavity 12 is connected to the sliding hole 111. A first oil hole 14 connected to the rodless cavity 13 and a second oil hole 15 connected to the rod cavity 12 are respectively formed on the circumferential outer wall of the cylinder tube 1. The first buffer portion 31 is located in the rodless cavity 13, and the second buffer portion 32 is located in the rod cavity 12.

[0046] Reference Figure 2 A first oil pipe 16 connected to the first oil hole 14 and a second oil pipe 17 connected to the second oil hole 15 are welded and fixed to the outer wall of the cylinder 1. The first oil pipe 16 and the second oil pipe 17 are both located at the end of the cylinder 1 away from the sliding hole 111. The second oil pipe 17 is provided with a connecting pipe 18. The connecting pipe 18 includes a hard pipe section 181 connected to the second oil pipe 17 and a soft pipe section 182. The two ends of the soft pipe section 182 are respectively connected to the end of the hard pipe section 181 away from the second oil pipe 17 and the second oil hole 15.

[0047] Reference Figure 2 When the oil cylinder is working, the first oil pipe 16 and the second oil pipe 17 are connected to the oil pressure device through the oil pipe to receive or output oil. When the piston rod 2 of the oil cylinder is in an extended state, the oil enters the rodless chamber 13 through the first oil pipe 16 and the first oil hole 14, and applies pressure to the buffer 3. The pressure difference between the rodless chamber 13 and the rod chamber 12 drives the piston rod 2 to move, and the length of the piston rod 2 extending out of the sliding hole 111 increases. At this time, the volume of the rodless chamber 13 increases, and the volume of the rod chamber 12 decreases. The oil in the rod chamber 12 passes through the second oil hole 15, the connecting pipe 18 and the second oil pipe 17 in turn to enter the oil pressure device; when the piston rod 2 of the oil cylinder is in a contracted state, the oil enters the rod chamber 12 through the second oil hole 15. At this time, the volume of the rod chamber 12 increases, the volume of the rodless chamber 13 decreases, and the length of the piston rod 2 extending out of the sliding hole 111 decreases.

[0048] Reference Figure 2 and Figure 3 The first buffer portion 31 has a first buffer outer wall 311 connected to the outer wall of the sealing portion 33. A first buffer cavity 312 is formed between the first buffer outer wall 311 and the inner wall of the cylinder 1. The first buffer outer wall 311 gradually moves away from the inner wall of the cylinder 1 from one end close to the sliding hole 111 to the other end, thereby gradually increasing the cross-sectional area of the first buffer cavity 312 along this direction. The first buffer outer wall 311 can be arranged in an inclined plane, a curved surface, or other shapes, as long as the first buffer outer wall 311 gradually approaches the inner wall of the cylinder 1 from the end away from the second buffer portion 32 to the other end. In this embodiment, the first buffer outer wall 311 is arranged in an inclined plane to give the first buffer portion 31 a truncated cone shape.

[0049] Reference Figure 2 and Figure 3 The first buffer portion 31 has a first buffer outer wall 311 connected to the outer wall of the sealing portion 33. A first buffer cavity 312 is formed between the first buffer outer wall 311 and the inner wall of the cylinder 1. A second buffer cavity 322 is formed between the second buffer outer wall 321 and the inner wall of the cylinder 1. The second buffer outer wall 321 gradually approaches the inner wall of the cylinder 1 from one end close to the sliding hole 111 to the other end, so that the cross-sectional area of the second buffer cavity 322 along this direction gradually decreases. The second buffer outer wall 321 can be arranged in an inclined plane or a curved surface, as long as the second buffer outer wall 321 gradually approaches the inner wall of the cylinder 1 from the end away from the first buffer portion 31 to the other end. In this embodiment, the second buffer outer wall 321 is arranged in an inclined plane so that the second buffer portion 32 is truncated.

[0050] Reference Figure 3The sealing portion 33 is arranged in a circular ring shape, and the circumferential outer wall of the sealing portion 33 abuts against the inner wall of the cylinder 1, so that the rod cavity 12 and the rodless cavity 13 are two relatively sealed chambers, wherein the sealing portion 33, the first buffer portion 31 and the second buffer portion 32 are connected as a whole to make the production and manufacturing of the buffer component 3 simpler.

[0051] Reference Figure 2 and Figure 3 The cylinder 1 has a contraction buffer section and an extension buffer section. When the piston rod 2 just enters the contraction buffer section, the piston rod 2 moves in the direction of reducing the volume of the rodless chamber 13, and the first buffer chamber 312 begins to communicate with the first oil hole 14. As the piston rod 2 moves, due to the inclined setting of the outer wall of the first buffer part 31, the gap between the first inclined outer wall and the hole wall of the first oil hole 14 becomes smaller and smaller, so that the channel for oil to enter the first oil hole 14 becomes smaller and smaller, the flow rate of oil in the first oil hole 14 gradually decreases, and the volume reduction rate of the rodless chamber 13 decreases. Since the cross-sectional area of the cylinder 1 along its length direction remains unchanged, the speed of the piston rod 2 and the buffer 3 is reduced to achieve the buffering effect.

[0052] Reference Figure 3 , wherein, when the contraction buffer section is completed, the end of the first buffer portion 31 away from the second buffer portion 32 abuts against the inner cavity wall of the cylinder 1 away from the sliding hole 111. At this time, there is still a certain gap between the first inclined outer wall and the hole wall of the first oil hole 14 for oil flow, so that when the piston rod 2 enters the extension state later, the oil can enter the rodless cavity 13 through the first oil hole 14 and the second buffer cavity 322, providing power for the movement of the piston rod 2.

[0053] Reference Figure 2 and Figure 3 When the piston rod 2 just enters the extension buffer section, at this time, the piston rod 2 moves in the direction of reducing the volume of the rod chamber 12, and the second buffer chamber 322 begins to communicate with the first oil hole. As the piston rod 2 moves, due to the inclined setting of the outer wall of the second buffer part 32, the gap between the second inclined outer wall and the hole wall of the second oil hole 15 becomes smaller and smaller, the flow rate of the oil in the second oil hole 15 gradually decreases, and the volume reduction rate of the rod chamber 12 decreases, thereby reducing the speed of the piston rod 2 and the buffer member 3 to achieve the buffering effect.

[0054] Reference Figure 2A fixed bushing 4 is welded and fixed to the inner wall of the cylinder barrel 1 near one end of the sliding hole 111. The fixed bushing 4 is cylindrical, and the piston rod 2 slides through the fixed bushing 4. When the extension buffering section is completed, the end of the second buffer portion 32 away from the first buffer portion 31 abuts the end face of the fixed bushing 4 away from the sliding hole 111. At this time, a certain gap still exists between the first inclined outer wall and the wall of the first oil hole 14 to allow oil to flow. When the piston rod 2 enters the extended state, the oil can enter the rod cavity 12 through the second oil hole 15 and the second buffer cavity 322, providing power for the movement of the piston rod 2.

[0055] Reference Figure 4 In another embodiment, when the piston rod 2 enters the extended state from the contracted state or enters the contracted state from the extended state, the speed of the piston rod 2 needs to increase from zero. The example of the piston rod 2 changing from the contracted state to the extended state is used for explanation. At this time, the gap between the hole wall of the first oil hole 14 and the first buffer outer wall 311 is small, and the speed at which the oil enters the rodless cavity 13 from the first oil hole 14 is slow, so that the volume increase rate of the rodless cavity 13 is low, and the starting speed of the piston rod 2 is slow. In order to solve this problem to a certain extent, an elastic sheet 39 is provided inside the buffer 3. The elastic sheet 39 is installed on the outer wall of the buffer 3 and is arranged opposite to the first oil hole 14 to receive the impact of the oil in the first oil hole 14. The elastic sheet 39 is made of a material with a certain elasticity. In this embodiment, rubber is preferably used.

[0056] Reference Figure 4 When the piston rod 2 changes from a retracted state to an extended state, the oil pressure device starts to supply oil to the rodless cavity 13 through the first oil hole 14. Since the pressure of the oil entering the first oil hole 14 is relatively high, it directly exerts a relatively high pressure on the outer wall of the sealing portion 33 and the outer wall of the first buffer outer wall 311. At this time, the elastic sheet 39 inside the buffer 3 is forced to shrink, so that the gap between the outer wall of the sealing portion 33 and the first buffer outer wall 311 and the hole wall of the first oil hole 14 increases, and the flow rate of the oil in the first oil hole 14 increases, thereby increasing the rate of increase of the volume of the rodless cavity 13 and making the piston rod 2 have a faster starting speed. Among them, when the piston rod 2 is in the process of being in the retracted buffer section, since the oil in the oil pressure device does not enter the rodless cavity 13 through the first oil hole 14 at this time, the pressure on the elastic sheet 39 is relatively small, the volume shrinkage of the elastic sheet 39 is relatively small, and the impact on the buffering effect of the piston rod 2 is relatively small.

[0057] There are two elastic sheets 39 on the buffer member 3, and the two elastic sheets 39 are symmetrically arranged about the sealing portion 33. One elastic sheet 39 corresponds to the first oil hole 14, and the other elastic sheet 39 corresponds to the second oil hole 15 and is used to transform the piston rod 2 from an extended state to a contracted state.

[0058] Reference Figure 3 Furthermore, a sealing ring groove is provided on the circumferential outer wall of the sealing portion 33, and a sealing member 37 for sealing is embedded in the sealing ring groove of the sealing portion 33. In this embodiment, the sealing member 37 is preferably a gray ring.

[0059] Reference Figure 3 The piston rod 2 includes a rod body 21 and a fixing rod 22 integrally connected to the rod body 21. The fixing rod 22 is located inside the cylinder 1 and has a radius smaller than that of the rod body 21. The buffer 3 is provided with a connecting hole 35 for inserting the end of the rod body 21 and a fixing hole 34 for inserting the fixing rod 22. The fixing hole 34 is connected to the connecting hole 35. The end of the fixing rod 22 away from the rod body 21 passes through the fixing hole 34 and is fitted with a fixing member 23. In this embodiment, the fixing member 23 is a nut and is threadedly connected to the fixing rod 22. The fixing member 23 abuts against the end of the first buffer portion 31 away from the first buffer portion 31, thereby fixing the buffer 3 to the piston rod 2.

[0060] Reference Figure 3 Furthermore, a recess 36 for the retaining member 23 to engage is defined on the side wall of the first buffer portion 31 away from the second buffer portion 32. When the buffering stage is complete, the end surface of the retaining rod 22 away from the rod body 21 and the end surface of the first buffer portion 31 away from the second buffer portion 32 simultaneously abut against the inner wall of the cylinder 1 away from the sliding hole 111. By increasing the contact area, the pressure on the inner wall of the cylinder 1 is reduced, thereby minimizing damage to the inner wall of the cylinder 1.

[0061] An annular groove is formed on the wall of the fixing hole 34 , and a first sealing ring 38 is embedded in the annular groove of the buffer member 3 , thereby enhancing the sealing between the rod cavity 12 and the rodless cavity 13 .

[0062] Reference Figure 5 One end of the cylinder 1 is sleeved with an end cover 11, which is threadedly connected to the end of the cylinder 1. A sliding hole 111 is opened on the end cover 11, and an annular groove connected to the sliding hole 111 is opened on the end cover 11. A dust ring 112 is embedded in the annular groove of the end cover 11, and the piston rod 2 slides through the dust ring 112.

[0063] Reference Figure 5 The fixed bushing 4 abuts against the end cover 11 and has two fixed ring grooves formed thereon. A second sealing ring 41 is embedded in each of the two fixed ring grooves, and the piston rod 2 slides through the two second sealing rings 41. At the same time, a step seal 43 for sealing is embedded in the circumferential outer wall of the fixed bushing 4.

[0064] The implementation principle of a bidirectional buffering forward and backward oil cylinder in an embodiment of the present application is: in the process of decelerating and buffering the piston rod 2, by setting the first buffer outer wall 311 and the second buffer outer wall 321, the oil flow in the first oil hole 14 or the second oil hole 15 is reduced, thereby decelerating and buffering the piston rod 2; at the same time, by setting the elastic sheet 39, the elastic sheet 39 is forced to contract, thereby increasing the oil flow in the first oil hole 14 or the second oil hole 15, thereby increasing the starting speed of the piston rod 2.

[0065] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A bidirectional buffer forward and backward oil cylinder, characterized by: It comprises a cylinder (1), a piston rod (2) slidingly inserted into the cylinder (1), and a buffer member (3) located in the cylinder (1) and connected to the piston rod (2), wherein a first oil hole (14) and a second oil hole (15) are formed on the outer wall of the cylinder (1); The cylinder (1) has a deceleration buffer section, and when the piston rod (2) enters the deceleration buffer section, the flow rate of oil entering the first oil hole (14) or the second oil hole (15) is reduced; The buffer member (3) comprises a first buffer portion (31), a second buffer portion (32), and a sealing portion (33) located between the first buffer portion (31) and the second buffer portion (32), wherein the sealing portion (33) divides the inner cavity of the cylinder (1) into two relatively sealed cavities; The deceleration buffer section comprises a contraction buffer section and an extension buffer section, the first buffer portion (31) acts on the contraction buffer section and corresponds to the first oil hole (14), and the second buffer portion (32) acts on the extension buffer section and corresponds to the second oil hole (15); The first buffer portion (31) has a first buffer outer wall (311), and the first buffer outer wall (311) and the inner wall of the cylinder (1) form a first buffer cavity (312). When the piston rod (2) is in the contraction buffer section, the first buffer cavity (312) is connected to the first oil hole (14). The first buffer outer wall (311) gradually approaches the inner cavity wall of the cylinder (1) from the end away from the second buffer portion (32) to the end close to the second buffer portion (32) along the length direction of the cylinder (1); The second buffer portion (32) has a second buffer outer wall (321), and the second buffer outer wall (321) and the inner wall of the cylinder (1) form a second buffer cavity (322). When the piston rod (2) is in the process of extending the buffer section, the second buffer cavity (322) is connected to the second oil hole (15). The cross-sectional area of the first buffer outer wall (311) along the length direction of the cylinder (1) gradually approaches the inner cavity wall of the cylinder (1) from the end away from the first buffer portion (31) to the end close to the first buffer portion (31). Two elastic pieces (39) are provided on the buffer member (3), one elastic piece (39) corresponds to the first oil hole (14), and the other elastic piece (39) corresponds to the second oil hole (15). When deceleration buffering is completed, the elastic piece (39) is located below the first oil hole (14) or the second oil hole (15).

2. A bidirectional buffer forward and backward oil cylinder according to claim 1, characterized in that: The first buffer outer wall (311) and the second buffer outer wall (321) are both inclined and arranged in a plane.

3. The bidirectional buffer forward and backward oil cylinder according to claim 1, characterized in that: The buffer member (3) is provided with a fixing hole (34) for the end of the piston rod (2) to pass through, and the end of the piston rod (2) is provided with a fixing member (23) for fixing the buffer member (3) on the piston rod (2), and the fixing member (23) is in contact with a side of the first buffer portion (31) away from the second buffer portion (32).

4. The bidirectional buffer forward and backward oil cylinder according to claim 3, characterized in that: The first buffer portion (31) is provided with a clearance groove (36) for the end of the piston rod (2) to pass through, the end of the piston rod (2) and the fixing member (23) are embedded in the clearance groove (36), and the fixing member (23) abuts against the bottom of the clearance groove (36).

5. The bidirectional buffer forward and backward oil cylinder according to claim 3, characterized in that: The piston rod (2) comprises a rod body (21) and a fixing rod (22) connected to one end of the rod body (21); the diameter of the fixing rod (22) is smaller than that of the rod body (21); the buffer member (3) is provided with a connecting hole (35) which is connected to the fixing hole (34) and is provided for the rod body (21) to be embedded; the fixing rod (22) is passed through the fixing hole (34) and the fixing member (23) and is threadedly connected to the fixing member (23).

6. The bidirectional buffer forward and backward oil cylinder according to claim 5, characterized in that: An end face of the fixing rod (22) away from the rod body (21) and an end face of the first buffer portion (31) away from the second buffer portion (32) are in the same plane. When the contraction stroke of the buffer member (3) is completed, an end face of the first buffer portion (31) away from the second buffer portion (32) and an end face of the fixing rod (22) away from the rod body (21) simultaneously abut against the cavity wall of the end portion of the cylinder (1).

7. The bidirectional buffer forward and backward oil cylinder according to claim 1, characterized in that: The sealing portion (33) is arranged in an annular shape, and the circumferential outer side wall of the sealing portion (33) abuts against the cavity wall inside the cylinder (1). A sealing ring groove is provided on the sealing portion (33), and a sealing member (37) is provided in the sealing ring groove of the sealing portion (33).

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