CN114294300A - Bidirectional buffer forward and backward moving oil cylinder - Google Patents

Abstract

The application relates to a bidirectional buffer forward and backward movement oil cylinder, which belongs to the technical field of oil cylinder devices and comprises a cylinder barrel, a piston rod and a buffer piece, wherein the buffer piece is positioned in the cylinder barrel and connected with the piston rod; the bolster includes first buffering portion and second buffering portion and is located sealing between first buffering portion and the second buffering portion, first buffering portion has the first buffering outer wall that the slope set up, first buffering outer wall forms first cushion chamber with the inner wall of cylinder, second buffering portion has the second buffering outer wall that the slope set up, second buffering outer wall forms the second cushion chamber with the inner wall of cylinder, and this application has when can cushion the piston rod in the hydro-cylinder, has reduced the required effect of precision to the hydro-cylinder manufacturing.

Description

Bidirectional buffer forward and backward moving oil cylinder

Technical Field

The application relates to the field of oil cylinder devices, in particular to a bidirectional buffer forward and backward movement oil cylinder.

Background

At present, in industrial production, an oil cylinder is generally used as a driving element to drive other parts to do linear reciprocating motion.

The oil cylinder comprises a cylinder barrel for containing oil, a piston rod which is arranged in the oil cylinder in a sliding penetrating mode and an end cover fixedly connected with the piston rod, wherein the end cover is provided with an oil hole used for receiving the oil in the oil pressure device. When the piston rod moves towards the end cover, the speed of the piston rod cannot be reduced suddenly due to the action of inertia, so that one end of the piston rod close to the end cover is impacted on the end cover, and the end cover is easy to damage while great noise is generated.

In order to reduce the impact of the piston rod on the end cover, in the related technology, one end of the piston rod close to the end cover is provided with a protrusion, the upper part of the end cover is provided with a groove for the protrusion to slide and penetrate and be communicated with the inner cavity of the cylinder barrel, and when the protrusion is embedded into the groove, a buffer gap for oil to flow through is arranged between the groove wall of the protrusion and the groove. The oil return resistance of the piston rod is increased through the narrow buffer gap of the liquid, so that the piston rod is decelerated.

In view of the above-mentioned related technologies, the inventor considers that in the above-mentioned technical scheme, in order to enable the cylinder to have a good buffering effect, in the process of buffering the piston rod, the buffering space between the groove walls of the protrusion and the groove is required to be small, and in the process of processing the protrusion and the groove, the protrusion and the groove may be eccentric, so that the axes of the protrusion and the groove are not on the same straight line, thereby causing a friction loss between the groove walls of the protrusion and the groove, and simultaneously affecting the buffering effect.

Disclosure of Invention

In order to reduce the precision requirement to the hydro-cylinder manufacturing when can cushion the piston rod in the hydro-cylinder, this application provides a two-way buffering antedisplacement hydro-cylinder.

The application provides a two-way buffering moves hydro-cylinder from beginning to end adopts following technical scheme:

a bidirectional buffer forward-backward moving oil cylinder comprises a cylinder barrel, a piston rod and a buffer piece, wherein the piston rod is slidably arranged in the cylinder barrel in a penetrating mode, the buffer piece is located in the cylinder barrel and connected with the piston rod, and a first oil hole and a second oil hole are formed in the outer side wall of the cylinder barrel;

the piston rod is provided with a deceleration buffer section, and when the piston rod enters the deceleration buffer section, the flow of the oil entering the first oil hole or the second oil hole is reduced

By adopting the technical scheme, when the piston rod is buffered, the flow of oil in the first oil hole or the second oil hole is reduced, and the sectional area of the cylinder barrel along the length direction is unchanged, so that the moving speed of the piston rod in the cylinder barrel is reduced.

Through setting up in the cylinder between the bolster, in the bolster course of working, need not produce the end cover to need not consider the problem that whether the arch on the piston rod can aim at the upper groove of end cover, when having reduced manufacturing cost, reduced the requirement to the accurate complex of hydro-cylinder internals, thereby improved the production speed of hydro-cylinder.

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, and the sealing portion divides an inner cavity of the cylinder into two relatively sealed cavities;

the deceleration buffer section comprises a contraction buffer section and an extension buffer section, the first buffer part acts on the contraction buffer section and corresponds to the first oil hole, and the second buffer part acts on the extension buffer section and corresponds to the second oil hole.

By adopting the technical scheme, the first buffer part and the second buffer part are arranged, so that the buffer part can buffer the piston rod in two directions, the two ends of the cylinder barrel are not easy to damage the end part of the cylinder barrel due to impact when the two ends of the cylinder barrel are contacted with the piston rod, and the service life of the oil cylinder is prolonged;

optionally, the first buffering portion has a first buffering outer wall, the first buffering outer wall and an inner wall of the cylinder barrel form a first buffering cavity, when the buffering member is in the contraction buffering section, the first buffering cavity is communicated with the first oil hole, and the first buffering outer wall gradually approaches to an inner cavity wall of the cylinder barrel from an end far away from the second buffering portion to an end close to the second buffering portion along the length direction of the cylinder barrel;

the second buffer part is provided with a second buffer outer wall, the second buffer outer wall and the inner wall of the cylinder barrel form a second buffer cavity, when the buffer part is positioned in the process of extending the buffer section, the second buffer cavity is communicated with the second oil hole, the first buffer outer wall is along the sectional area of the cylinder barrel in the length direction from the end far away from the first buffer part to the end near the first buffer part, and the end near the first buffer part is gradually close to the inner cavity wall of the cylinder barrel.

Through adopting above-mentioned technical scheme, when the piston rod was in the shrink buffer segment, because first buffering outer wall was close to the inner chamber wall of cylinder to the one end that is close to the second buffering portion from the one end of keeping away from the second buffering portion to the one end of being close to the second buffering portion along cylinder length direction, make the fluid flow through first oilhole reduce gradually, the reducing rate of the fluid volume in the cavity at first bolster place reduces gradually, because the cylinder is fixed unchangeable along its length direction's sectional area, so the speed of the length of the cavity at first bolster place reduces gradually, and then make the speed of bolster and piston rod reduce gradually, in order to reach the buffering effect that slows down. When the piston rod is in the process of extending the buffer section, the inner cavity wall of the cylinder barrel is gradually closed through the second buffer outer wall, so that the process that the piston rod is in the extending state is decelerated and buffered. The sectional areas of the first buffer cavity and the second buffer cavity are gradually changed, so that the deceleration buffer process of the piston rod is smoother, the speed change of a mechanism in transmission connection with the piston rod is smoother, and the actual production requirements are met.

Optionally, the first buffering outer wall and the second buffering outer wall are both inclined and arranged in a plane.

Through adopting above-mentioned technical scheme, at the in-process to bolster processing, because first buffering outer wall and the equal slope of second buffering outer wall are the plane setting, can adopt cutting device directly to carry out cutting process to the lateral wall of bolster, be the curved surface setting for buffering first buffering outer wall and second, this mode makes things convenient for the processing of first buffering outer wall and second buffering outer wall, has improved the production efficiency of bolster.

Optionally, the buffer member is provided with a fixing hole for the end of the piston rod to pass through, the end of the piston rod is provided with a fixing member for fixing the buffer member on the piston rod, and the fixing member is abutted against one side of the first buffer portion, which is far away from the second buffer portion.

By adopting the technical scheme, the end part of the piston rod is arranged in the buffer part in a penetrating mode, and the buffer part and the piston rod are fixed through the fixing part, so that the buffer part and the piston rod are not prone to axial sliding, and the buffer part and the piston rod are connected more stably. Meanwhile, the buffer piece is arranged at the end part of the piston, compared with the buffer piece arranged at the middle part or other parts of the piston rod, the stroke of the piston rod in one-time reciprocating motion is increased under the condition that the length and the buffer distance of the cylinder barrel are fixed, and the utilization rate of the length of the cylinder barrel is improved. Meanwhile, the fixing holes are formed in the buffer parts, so that the material consumption of the buffer parts is reduced.

Optionally, offer the confession on the first buffer the tank of stepping down that the tip of piston rod wore to establish, the tip of piston rod with the mounting embedding in the tank of stepping down, just the mounting with the tank bottom looks butt in tank of stepping down.

By adopting the technical scheme, the fixing piece and the end part of the piston end are embedded into the fixing groove, and the stroke amount of one-time reciprocating motion of the piston rod is further increased under the condition that the length and the buffering distance of the cylinder barrel are fixed, so that the utilization rate of the length of the cylinder barrel is improved.

Optionally, the piston rod includes body of rod body and with the dead lever that the one end of body of rod is connected, the diameter of dead lever is less than body of rod body, set up on the bolster with the fixed orifices intercommunication just supplies the connecting hole of body of rod body embedding, the dead lever wear to locate the fixed orifices with in the mounting and with mounting threaded connection.

By adopting the technical scheme, the sectional area of the fixing hole along the length direction is smaller than the sectional areas of the connecting hole along the length direction and the abdicating groove along the length direction, so that the buffer part is further not easy to axially slide on the piston rod, and the connection between the piston rod and the buffer part is more stable; meanwhile, the fixing piece is in threaded connection with the fixing rod, so that the piston rod and the buffer piece are more convenient to fix and install; further, under the certain circumstances of cylinder along its length direction and body of rod body along its length direction's sectional area, through setting up the dead lever that the radius is less than body of rod body, for mounting threaded connection provides certain space of stepping down on the dead lever, make the groove of stepping down can hold the mounting along its length direction's sectional area.

Optionally, an end face of the fixed rod, which is far away from the rod body, and an end face of the first buffering portion, which is far away from the second buffering portion, are located on the same plane, and when the contraction stroke of the buffering member is completed, an end face of the first buffering portion, which is located inside the cylinder barrel, and an end face of the fixed rod, which is far away from the rod body, are simultaneously abutted against the cavity wall of the end portion of the cylinder barrel.

Through adopting above-mentioned technical scheme, keep away from a terminal surface of body of rod body and a terminal surface that the second buffering portion was kept away from to first buffering portion through keeping away from the dead lever and being in the coplanar, increased the area of contact of bolster and piston rod and the inner chamber wall of cylinder tip, under the certain circumstances of pressure size, reduced the pressure between bolster and piston rod and the inner chamber wall of cylinder to make the inner chamber wall of cylinder more not fragile.

Optionally, the sealing portion is the annular setting, just the circumference lateral wall of sealing portion with the inside chamber wall butt of cylinder, sealed annular has been seted up in the sealing portion, the sealing portion in sealed annular endotheca sets up the sealing member.

By adopting the technical scheme, the tightness between the rodless cavity and the rod cavity is increased, and oil between the rod cavity and the rodless cavity is not easy to flow mutually, so that the pressure difference between the rod cavity and the rodless cavity is maintained, and the piston rod can better move back and forth in the cavity inside the cylinder barrel.

Optionally, the buffer member is provided with at least one elastic sheet, and when the deceleration buffer is completed, the elastic sheet is located below the first oil hole or the second oil hole.

By adopting the technical scheme, when the elastic sheet is not arranged, when the speed reduction buffering of the piston rod is completed, oil in the oil pressure device enters the cylinder barrel through the first oil hole or the second oil hole, and the flow of the oil entering the cylinder barrel is smaller because a channel between the first buffering cavity and the first oil hole or a channel between the second buffering cavity and the second oil hole is smaller, so that the starting speed of the piston rod is smaller; through setting up the flexure strip, because the oil pressure of the interior fluid of first oilhole or second oilhole is great, fluid extrudees the flexure strip, and makes the flexure strip shrink with increase flow passage, has increased the flow that gets into the inside fluid of cylinder to increase the start-up speed of piston rod.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the buffer part inside the cylinder barrel, the end cover is not required to be produced in the process of producing the oil cylinder, and meanwhile, the requirement on the precision of the buffer part is reduced, and the production of the buffer part is facilitated;

2. the sectional areas of the first buffer cavity and the second buffer cavity are gradually reduced, so that the speed change of the piston rod is more moderate, and the actual production requirement is more met;

3. through setting up the flexure strip, when the speed reduction buffering of piston is accomplished, accelerated the flow that gets into the inside fluid of cylinder from first oilhole or second oilhole to improve the start-up speed of piston rod.

Drawings

Fig. 1 is an overall schematic view of a cylinder according to an embodiment of the present application.

Fig. 2 is an overall sectional view of the oil cylinder according to the embodiment of the present application.

FIG. 3 is a cross-sectional view of a piston rod and damper in a retraction damper section according to an embodiment of the present application.

Fig. 4 is a cross-sectional view of another embodiment of a cushioning member.

FIG. 5 is a cross-sectional view of an end cap and a retaining bushing of an embodiment of the present application.

Description of reference numerals: 1. a cylinder barrel; 11. an end cap; 111. a sliding hole; 112. a dust ring; 12. a rod cavity; 13. a rodless cavity; 14. a first oil hole; 15. a second oil hole; 16. a first oil pipe; 17. a second oil pipe; 18. a connecting pipe; 181. a hard pipe section; 182. a hose section; 2. a piston rod; 21. a rod body; 22. fixing the rod; 23. a fixing member; 3. a buffer member; 31. a first buffer section; 311. a first buffer outer wall; 312. a first buffer chamber; 32. a second buffer section; 321. a second buffer outer wall; 322. a second buffer chamber; 33. a sealing part; 34. a fixing hole; 35. connecting holes; 36. a yielding groove; 37. a seal member; 38. a first seal ring; 39. an elastic sheet; 4. fixing the bushing; 41. a second seal ring; 43. and (4) performing Steckel.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses two-way buffering oil cylinder capable of moving forwards and backwards.

Referring to fig. 1 and 2, the bidirectional buffer forward and backward movement oil cylinder includes a cylinder barrel 1 having a cavity therein, a piston rod 2, and a buffer member 3. The tip on the cylinder 1 is seted up and is supplied piston rod 2 to slide the hole 111 that slides of wearing to establish, and bolster 3 is located the inside one end fixed connection of cylinder 1 with piston rod 2.

Referring to fig. 2 and 3, the cushion member 3 includes a first cushioning portion 31 and a second cushioning portion 32, and a sealing portion 33 located between the first cushioning portion 31 and the second cushioning portion 32, the sealing portion 33 dividing a cavity inside the cylinder tube 1 into a rod cavity 12 and a rodless cavity 13, the rod cavity 12 communicating with the slide hole 111. A first oil hole 14 communicated with the rodless cavity 13 and a second oil hole 15 communicated with the rod cavity 12 are respectively formed in the circumferential outer side wall of the cylinder barrel 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.

Referring to fig. 2, a first oil pipe 16 communicating with the first oil hole 14 and a second oil pipe 17 communicating with the second oil hole 15 are welded and fixed to the outer side wall of the cylinder 1. The first oil pipe 16 and the second oil pipe 17 are both located at one end of the cylinder barrel 1 far away from the sliding hole 111, the second oil pipe 17 is provided with a connecting pipe 18, the connecting pipe 18 comprises a hard pipe section 181 communicated with the second oil pipe 17 and a hose section 182, and two ends of the hose section 182 are respectively communicated with one end of the hard pipe section 181 far away from the second oil pipe 17 and the second oil hole 15.

Referring to fig. 2, when the oil cylinder works, the first oil pipe 16 and the second oil pipe 17 are both connected with the oil pressure device through the oil pipes to receive or output oil, when the piston rod 2 of the oil cylinder is in an extension state, the oil enters the rodless cavity 13 through the first oil pipe 16 and the first oil hole 14, applies pressure to the buffer 3, drives the piston rod 2 to move through the pressure difference between the rodless cavity 13 and the rod cavity 12, the length of the piston rod 2 extending out of the sliding hole 111 is increased, at this time, the volume of the rodless cavity 13 is increased, the volume of the rod cavity 12 is reduced, and the oil in the rod cavity 12 sequentially enters the oil pressure device through the second oil hole 15, the connecting pipe 18 and the second oil pipe 17; when the piston rod 2 of the oil cylinder is in a contraction state, oil enters the rod cavity 12 through the second oil hole 15, at the moment, the volume of the rod cavity 12 is increased, the volume of the rodless cavity 13 is reduced, and the length of the piston rod 2 extending out of the sliding hole 111 is reduced.

Referring to fig. 2 and 3, the first buffer portion 31 has a first buffer outer wall 311 connected to the outer side wall of the sealing portion 33, a first buffer chamber 312 is formed between the first buffer outer wall 311 and the inner cavity wall of the cylinder 1, and the first buffer outer wall 311 is gradually separated from the inner cavity wall of the cylinder 1 from one end close to the sliding hole 111 to the other end, so that the sectional area of the first buffer chamber 312 in the direction is gradually increased. Wherein, the first buffering outer wall 311 may be inclined to be in a planar configuration, or may be in a curved configuration, or may be in other configurations, as long as the first buffering outer wall 311 gradually approaches the inner cavity wall of the cylinder barrel 1 from the end far away from the second buffering portion 32 to the other end, in this embodiment, the first buffering outer wall 311 is inclined to be in a planar configuration so that the first buffering portion 31 is in a circular truncated cone shape.

Referring to fig. 2 and 3, the first buffer portion 31 has a first buffer outer wall 311 connected to the outer side wall of the seal portion 33, a first buffer chamber 312 is formed between the first buffer outer wall 311 and the inner chamber wall of the cylinder 1, a second buffer chamber 322 is formed between the second buffer outer wall 321 and the inner chamber wall of the cylinder 1, and the second buffer outer wall 321 gradually approaches the inner chamber wall of the cylinder 1 from one end near the sliding hole 111 to the other end, so that the sectional area of the second buffer chamber 322 in the direction gradually decreases. The second buffer outer wall 321 may be inclined to be in a planar arrangement, or may be in a curved arrangement, as long as the second buffer outer wall 321 gradually approaches to the inner cavity wall of the cylinder barrel 1 from the end far away from the first buffer portion 31 to the other end, in this embodiment, the second buffer outer wall 321 is inclined to be in a planar arrangement so that the second buffer portion 32 is in a circular truncated cone shape.

Referring to fig. 3, the sealing portion 33 is disposed in a circular ring shape, and a circumferential outer side wall of the sealing portion 33 abuts against an inner cavity wall of the cylinder barrel 1, so that the rod cavity 12 and the rodless cavity 13 are two relatively sealed cavities, wherein the sealing portion 33, the first buffer portion 31 and the second buffer portion 32 are integrally connected, so that the buffer member 3 is simpler to produce and manufacture.

Referring to fig. 2 and 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, at this time, the piston rod 2 moves along the direction of reducing the volume of the rodless chamber 13, the first buffer chamber 312 is communicated with the first oil hole 14, along with the movement of the piston rod 2, because the outer side wall of the first buffer portion 31 is obliquely arranged, the gap between the first oblique outer wall and the hole wall of the first oil hole 14 is smaller and smaller, so that the passage through which oil enters the first oil hole 14 is smaller and smaller, the flow rate of the oil in the first oil hole 14 is gradually reduced, the rate of reducing the volume of the rodless chamber 13 is reduced, and because the sectional area of the cylinder 1 along the length direction thereof is not changed, the rate of the piston rod 2 and the buffer 3 is reduced, so as to achieve the buffering effect.

Referring to fig. 3, when the retraction buffer section is completed, one end of the first buffer portion 31, which is far away from the second buffer portion 32, abuts against an inner cavity wall of the cylinder barrel 1, which is far away from one end of the sliding hole 111, at this time, a certain gap is still left between the first inclined outer wall and a hole wall of the first oil hole 14 to allow oil to flow, so that when the piston rod 2 enters an extended state, oil can enter the rodless cavity 13 through the first oil hole 14 and the second buffer cavity 322 to provide power for the movement of the piston rod 2.

Referring to fig. 2 and 3, when the piston rod 2 just enters the extension buffer section, at this time, the piston rod 2 moves along the direction of reducing the volume of the rod chamber 12, the second buffer chamber 322 is communicated with the first oil hole, along with the movement of the piston rod 2, because the outer side wall of the second buffer portion 32 is obliquely arranged, the gap between the second oblique 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 is gradually reduced, and the rate of reducing the volume of the rod chamber 12 is reduced, so that the rates of the piston rod 2 and the buffer 3 are reduced, and the buffering effect is achieved.

Referring to fig. 2, a fixed bushing 4 is welded and fixed on the inner cavity 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 is slidably inserted into the fixed bushing 4. When the extension buffer section is finished, one end of the second buffer part 32, which is far away from the first buffer part 31, abuts against one end face of the fixed bush 4, which is far away from the sliding hole 111, at the moment, a certain gap is still left between the first inclined outer wall and the hole wall of the first oil hole 14 to allow oil to flow, so that when the piston rod 2 enters an extension state, the oil can enter the rod cavity 12 through the second oil hole 15 and the second buffer cavity 322 to provide power for the movement of the piston rod 2.

Referring to fig. 4, in another embodiment, when the piston rod 2 enters the extended state from the retracted state or enters the retracted state from the extended state, the speed of the piston rod 2 needs to be increased from zero, taking the piston rod 2 as an example of changing from the contracted state to the extended state, when the gap between the hole wall of the first oil hole 14 and the first buffer outer wall 311 is small, the speed of the oil entering the rodless chamber 13 from the first oil hole 14 is slow, thereby the volume increasing speed of the rodless cavity 13 is lower, the starting speed of the piston rod 2 is lower, and to solve the problem to a certain extent, the elastic sheet 39 is arranged in the buffer piece 3, the elastic sheet 39 is arranged on the outer side wall of the buffer piece 3, and is disposed opposite to the first oil hole 14 to receive an impact of the oil in the first oil hole 14, and the elastic piece 39 is made of a material having a certain elasticity, preferably rubber in this embodiment.

Referring to fig. 4, when the piston rod 2 is converted from the contracted state to the extended state, the oil pressure device starts to supply oil to the rodless cavity 13 through the first oil hole 14, and since the pressure of the oil entering the first oil hole 14 is high and directly generates high pressure on the outer side wall of the sealing portion 33 and the outer side wall of the first buffering outer wall 311, the elastic sheet 39 inside the buffering member 3 is forced to contract, so that the gap between the outer side wall of the sealing portion 33 and the hole wall of the first buffering outer wall 311 and the hole wall of the first oil hole 14 is increased, the flow rate of the oil in the first oil hole 14 is increased, the increase rate of the volume of the rodless cavity 13 is increased, and the piston rod 2 has high starting speed. In the process that the piston rod 2 is in the contraction buffering section, oil in the oil pressure device does not enter the rodless cavity 13 through the first oil hole 14 at the moment, so that the pressure applied to the elastic sheet 39 is small, the volume contraction amount of the elastic sheet 39 is small, and the influence on the buffering effect of the piston rod 2 is small.

The two elastic pieces 39 are arranged on the buffer 3, the two elastic pieces 39 are symmetrically arranged about the sealing part 33, one elastic piece 39 corresponds to the first oil hole 14, and the other elastic piece 39 corresponds to the second oil hole 15 and is applied to the piston rod 2 to change from an extension state to a contraction state.

Referring to fig. 3, further, a sealing ring groove is formed on a circumferential outer side 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.

Referring to fig. 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 barrel 1, the radius of the fixing rod 22 is smaller than the radius of the rod body 21, the buffer 3 is provided with a connecting hole 35 for the end of the rod body 21 to be embedded into and a fixing hole 34 for the fixing rod 22 to be embedded into, and the fixing hole 34 is communicated with the connecting hole 35. The end of the fixing rod 22 far away from the rod body 21 passes through the fixing hole 34 and is sleeved with the fixing member 23, in this embodiment, the fixing member 23 is a nut and is in threaded connection with the fixing rod 22, and the fixing member 23 abuts against the end of the first buffering portion 31 far away from the first buffering portion 31, so as to fix the buffering member 3 on the piston rod 2.

Referring to fig. 3, further, a side wall of the first buffer portion 31 away from the second buffer portion 32 is provided with a yielding groove 36 for the fixing member 23 to be embedded in, when the buffer section is completely contracted, an end surface of the fixing rod 22 away from the rod body 21 and an end surface of the first buffer portion 31 away from the second buffer portion 32 are abutted to an inner cavity wall of the cylinder barrel 1 at an end away from the sliding hole 111. By increasing the contact area, the pressure on the inner wall of the cylinder barrel 1 is reduced, and the loss to the inner cavity wall of the cylinder barrel 1 is further reduced.

Wherein, the hole wall of the fixed hole 34 is provided with an annular groove, and the buffer member 3 is embedded with a first sealing ring 38 in the annular groove, thereby enhancing the sealing performance between the rod cavity 12 and the rodless cavity 13.

Referring to fig. 5, an end cover 11 is sleeved on one end of the cylinder barrel 1, the end cover 11 is in threaded connection with the end of the cylinder barrel 1, a sliding hole 111 is formed in the end cover 11, an annular groove communicated with the sliding hole 111 is formed in the end cover 11, a dust ring 112 is embedded in the annular groove of the end cover 11, and the piston rod 2 is slidably arranged in the dust ring 112.

Referring to fig. 5, the fixed bushing 4 abuts against the end cover 11, two fixed ring grooves are formed in the fixed bushing 4, the second sealing rings 41 are respectively embedded in the two fixed ring grooves of the fixed bushing 4, and the piston rod 2 is slidably inserted into the two second sealing rings 41. Meanwhile, a steiner 43 for sealing is embedded on the circumferential outer side wall of the fixed bushing 4.

The implementation principle of the bidirectional buffer forward and backward movement oil cylinder in the embodiment of the application is as follows: in the process of decelerating and buffering the piston rod 2, the first buffering outer wall 311 and the second buffering outer wall 321 are arranged, so that the oil flow in the first oil hole 14 or the second oil hole 15 is reduced, and the piston rod 2 is decelerated and buffered; meanwhile, by arranging the elastic sheet 39, the flow rate of the oil in the first oil hole 14 or the second oil hole 15 is increased by the stress contraction of the elastic sheet 39, so that the starting speed of the piston rod 2 is increased.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The utility model provides a two-way buffering moves hydro-cylinder from beginning to end which characterized in that: the oil cylinder comprises a cylinder barrel (1), a piston rod (2) which is slidably arranged in the cylinder barrel (1) in a penetrating manner, and a buffer piece (3) which is positioned in the cylinder barrel (1) and connected with the piston rod (2), wherein a first oil hole (14) and a second oil hole (15) are formed in the outer side wall of the cylinder barrel (1);

the cylinder barrel (1) is provided with a deceleration buffer section, and when the piston rod (2) enters the deceleration buffer section, the flow of oil entering the first oil hole (14) or the second oil hole (15) is reduced.

2. The bidirectional buffer forward-backward moving oil cylinder according to claim 1, characterized in that: the buffer piece (3) comprises a first buffer part (31), a second buffer part (32) and a sealing part (33) positioned between the first buffer part (31) and the second buffer part (32), and the sealing part (33) divides an inner cavity of the cylinder barrel (1) into two oppositely sealed cavities;

the deceleration buffer section comprises a contraction buffer section and an extension buffer section, the first buffer part (31) acts on the contraction buffer section and corresponds to the first oil hole (14), and the second buffer part (32) acts on the extension buffer section and corresponds to the second oil hole (15).

3. The bidirectional buffer forward-backward moving oil cylinder according to claim 2, characterized in that: the first buffer part (31) is provided with a first buffer outer wall (311), the first buffer outer wall (311) and the inner wall of the cylinder barrel (1) form a first buffer cavity (312), when the piston rod (2) is in a contraction buffer section, the first buffer cavity (312) is communicated with the first oil hole (14), and the first buffer outer wall (311) is gradually close to the inner cavity wall of the cylinder barrel (1) from one end far away from the second buffer part (32) to one end close to the second buffer part (32) along the length direction of the cylinder barrel (1);

the second buffer part (32) is provided with a second buffer outer wall (321), the second buffer outer wall (321) and the inner wall of the cylinder barrel (1) form a second buffer cavity (322), when the piston rod (2) is located in the process of extending the buffer section, the second buffer cavity (322) is communicated with the second oil hole (15), and the first buffer outer wall (311) is gradually close to the inner cavity wall of the cylinder barrel (1) along the sectional area of the length direction of the cylinder barrel (1) from one end far away from the first buffer part (31) to one end close to the first buffer part (31).

4. The bidirectional buffer forward-backward moving oil cylinder according to claim 3, characterized in that: the first buffer outer wall (311) and the second buffer outer wall (321) are inclined to be in plane arrangement.

5. The bidirectional buffer forward-backward moving oil cylinder according to claim 2, characterized in that: the fixing hole (34) that supplies the tip of piston rod (2) to wear to establish is seted up in bolster (3), the tip of piston rod (2) is provided with be used for with bolster (3) is fixed mounting (23) on piston rod (2), mounting (23) with first buffering portion (31) is kept away from one side looks butt of second buffering portion (32).

6. The bidirectional buffer forward-backward moving oil cylinder according to claim 5, characterized in that: offer the confession on first buffer portion (31) abdication groove (36) that the tip of piston rod (2) was worn to establish, the tip of piston rod (2) with mounting (23) embedding in abdication groove (36), just mounting (23) with the tank bottom looks butt in abdication groove (36).

7. The bidirectional buffer forward-backward moving oil cylinder according to claim 5, characterized in that: piston rod (2) including the body of rod body (21) and with dead lever (22) that the one end of the body of rod body (21) is connected, the diameter of dead lever (22) is less than body of rod body (21), seted up on bolster (3) with fixed orifices (34) are linked together and supply connecting hole (35) of body of rod body (21) embedding, dead lever (22) wear to locate fixed orifices (34) with in mounting (23) and with mounting (23) threaded connection.

8. The bidirectional buffer forward-backward moving oil cylinder according to claim 7, characterized in that: the dead lever (22) is kept away from a terminal surface of body of rod body (21) with first buffering portion (31) is kept away from a terminal surface of second buffering portion (32) is in the coplanar, works as when the shrink stroke of bolster (3) is accomplished, first buffering portion (31) are kept away from a terminal surface of second buffering portion (32) with dead lever (22) is kept away from a terminal surface of body of rod body (21) simultaneously with the chamber wall looks butt of cylinder (1) tip.

9. The bidirectional buffer forward-backward moving oil cylinder according to claim 2, characterized in that: sealing portion (33) are the annular setting, just the circumference lateral wall of sealing portion (33) with the inside chamber wall butt of cylinder (1), sealed annular has been seted up on sealing portion (33), sealing portion (33) in sealed annular endotheca sets up sealing member (37).

10. The bidirectional buffer forward-backward moving oil cylinder according to claim 1, characterized in that: at least one elastic sheet (39) is arranged on the buffer piece (3), and when the speed reduction and buffering are completed, the elastic sheet (39) is located below the first oil hole (14) or the second oil hole (15).

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