CN216742268U

CN216742268U - Oil cylinder with buffering function

Info

Publication number: CN216742268U
Application number: CN202220278927.1U
Authority: CN
Inventors: 金汝灯; 吴庆军; 欧国久; 王周明; 毛云杰; 胡斌
Original assignee: Hangzhou Forklift Gantry Co ltd
Current assignee: Hangzhou Forklift Gantry Co ltd
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2022-06-14
Anticipated expiration: 2032-02-10

Abstract

The application discloses hydro-cylinder with buffer function relates to the technical field of pneumatic cylinder, including hollow cylinder body, coaxial sliding is provided with the piston rod in the cylinder body, and cylinder body, the other end are worn out to piston rod one end and are provided with the piston, and piston laminating cylinder body inner wall is provided with the oil pressure mouth with the inner chamber intercommunication on the cylinder body, the one end that the piston rod was kept away from to the piston is provided with the buffering portion, be provided with the dashpot that is linked together with the oil pressure mouth on the inner chamber diapire of cylinder body, the dashpot supplies the buffering portion to insert, be provided with the spacer in the dashpot, the circumference inner wall of spacer is formed with the clearance with the circumference outer wall of buffering portion, be provided with the relief valve that is used for opening and close the oil pressure mouth on the cylinder body. This application is in order to realize the effect to piston rod and piston buffering and speed reduction, when applying this hydro-cylinder to the fork truck portal, can ensure the stable off-load decline of portal.

Description

Oil cylinder with buffering function

Technical Field

The application relates to the technical field of hydraulic cylinders, in particular to an oil cylinder with a buffering function.

Background

The cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion), as one of the types of hydraulic cylinders. The oil cylinder has simple structure and reliable work, can omit a speed reducer when used for realizing reciprocating motion, has no transmission clearance, and moves stably, thereby being widely applied to hydraulic systems of various machines. In particular, in forklift gantries, cylinders may be used as the drive source to move the fork carriage and gantry up and down.

The existing oil cylinder with the buffering function comprises a hollow cylinder body, a cylinder cover is arranged on one side of the cylinder body, a piston rod is coaxially and slidably arranged in the cylinder body in a penetrating manner, one end of the piston rod penetrates out of the cylinder cover, the other end of the piston rod is provided with a piston, the piston is attached to the inner wall of the cylinder body, an oil pressure port is formed in one side of the cylinder body, which is provided with the piston, an oil storage cavity is arranged between the piston rod and the inner wall of the cylinder body, oil is filled in the oil storage cavity, a buffering oil cavity is arranged inside the piston rod, the volume of the buffering oil cavity is larger than that of the oil in the oil storage cavity, a connecting part is arranged on one side, which faces the piston rod, and is fixedly arranged inside the buffering oil cavity, a first oil port and a second oil port are respectively formed in the side wall of the piston rod, the first oil port is communicated with the oil storage cavity and the buffering oil cavity, one end of the second oil port is communicated with the oil storage cavity, the other end is provided with a first fine oil port, the first fine oil port is communicated with the inner wall of the piston rod and extends to the connecting part, the side wall of the connecting portion is provided with a second fine oil port, the first fine oil port is communicated with the second fine oil port, one side, facing the buffer oil cavity, of the connecting portion is provided with an oil outlet, the oil outlet is communicated with the second fine oil port, the diameters of the first fine oil port and the second fine oil port are smaller than those of the first oil port, the side wall of the connecting portion is provided with an annular sealing groove, an O-shaped sealing ring is arranged in the sealing groove, and the O-shaped sealing ring abuts against the inner wall of the piston rod tightly. When the oil cylinder with the upstroke buffering function is applied to a forklift gantry, stable rising of the gantry can be ensured.

With respect to the related art in the above, the inventors consider that: the existing buffer oil cylinder generally only has the buffer function in the upper stroke process, the required buffer effect is higher in the unloading lower stroke process due to the larger weight of goods, and the buffer effect of the existing oil cylinder in the lower stroke is poor and needs to be improved.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the buffering effect of the oil cylinder is not good in the lower stroke, the application provides an oil cylinder with a buffering function.

The application provides a hydro-cylinder with buffer function adopts following technical scheme:

the utility model provides an hydro-cylinder with buffer function, includes hollow cylinder body, coaxial sliding is provided with the piston rod in the cylinder body, piston rod one end is worn out the cylinder body, the other end is provided with the piston, piston laminating cylinder body inner wall, be provided with the oil pressure mouth with the inner chamber intercommunication on the cylinder body, the one end that the piston rod was kept away from to the piston is provided with the buffering portion, be provided with the dashpot that is linked together with the oil pressure mouth on the inner chamber diapire of cylinder body, the dashpot supplies the buffering portion to insert, be provided with the spacer in the dashpot, the circumference inner wall of spacer is formed with the clearance with the circumference outer wall of buffering portion, be provided with the relief valve that is used for opening and close the oil pressure mouth on the cylinder body.

By adopting the technical scheme, in the lower stroke of unloading, the piston and the piston rod slide towards the inner cavity of the cylinder body, so that oil in the inner cavity of the cylinder body sequentially passes through the buffer slot, the oil pressure port and the safety valve discharge valve body, the buffer part is inserted into the buffer slot, the gap formed by the spacer bush and the buffer part reduces the entering of the oil into the oil pressure port, because the oil pressure is large, the safety valve gradually closes the oil pressure port to reduce the discharge of the oil, so that part of the oil flows back to the buffer slot from the oil pressure port, and the oil enters between the inner cavity of the cylinder body and the piston from the gap between the spacer bush and the buffer part to realize the buffering and decelerating effects on the piston rod and the piston, and when the oil cylinder is applied to a forklift gantry, the stable unloading descending of the gantry can be ensured.

Optionally, the inner chamber diapire of cylinder body is provided with the groove of stepping down that covers the dashpot, the spacer bush inlays to be located in the groove of stepping down.

Through adopting above-mentioned technical scheme, the spacer bush embedding groove of stepping down, spacer bush and the tank bottom butt of groove of stepping down, the circumference outer wall of spacer bush and the circumference cell wall butt of the groove of stepping down play spacing effect to the spacer bush.

Optionally, an embedding groove is formed in the circumferential groove wall of the abdicating groove, a limiting ring is embedded in the embedding groove, and the limiting ring is abutted to the spacer bush.

Through adopting above-mentioned technical scheme, spacing collar and spacer deviate from the one side butt of the groove of stepping down to and spacer and the groove bottom butt of the groove of stepping down, in order to realize with the fixed circumference cell wall with the groove of stepping down of spacer, with the restriction spacer slides along the extending direction of the groove of stepping down, reduce the spacer and take place the displacement because of the oil pressure, ensure cushioning effect's stability.

Optionally, one end of the piston, which is far away from the piston rod, is provided with a compensation groove corresponding to the abdicating groove around the axis line of the piston.

By adopting the technical scheme, the compensation groove improves the oil containing capacity between the piston and the bottom wall of the inner cavity of the cylinder body, increases the area of the buffer acting force acting on the piston, improves the sliding stability of the piston, and is convenient for the oil to enter between the plug and the bottom wall of the inner cavity of the cylinder body to push the piston to slide outwards; meanwhile, the contact area between the piston and the bottom wall of the inner cavity of the cylinder body is reduced, and the damage to the bottom wall of the inner cavity of the cylinder body is reduced.

Optionally, be provided with the ring of wearing on the circumference lateral wall of piston, wear ring and the laminating of cylinder body inner wall, the piston becomes clearance fit with the cylinder body inner wall.

Through adopting above-mentioned technical scheme, wear-resisting ring plays and stops fluid and pass through between piston and the cylinder body inner wall, plays sealed effect, and the reducible piston of ring and the cylinder body inner wall of wearing to wear because of the wearing and tearing that the looks friction received simultaneously improves the life of piston and cylinder body.

Optionally, a glaring is arranged on the circumferential side wall of the piston, and the glaring is attached to the inner wall of the cylinder body.

By adopting the technical scheme, under the action of the Glae ring, the piston can further improve the sealing performance on the premise of not influencing the movement, and the leakage of oil in the oil storage cavity from a gap between the piston and the inner wall of the cylinder body can be further reduced.

Optionally, the safety valve includes a valve body disposed in the oil pressure port, one end of the valve body is provided with a sliding groove, the other end of the valve body is provided with an oil injection hole penetrating through the bottom of the sliding groove, a valve core is slidably disposed in the sliding groove, one end of the valve core facing the sliding groove is provided with an oil guide hole, and the circumferential side wall of the valve core is provided with an oil guide hole communicated with the oil guide hole.

By adopting the technical scheme, under normal oil pressure, the valve core slides outwards along the extension direction of the sliding groove until the oil guide hole and the wall of the sliding groove are staggered, and oil sequentially passes through the oil guide hole, the sliding groove and the oil injection hole and is discharged out of the cylinder body; under too big oil pressure, the case atress slides towards the sliding tray in, makes draw oilhole and sliding tray cell wall coincidence to realize limiting fluid and pass through and draw the oilhole, play and close the oil pressure mouth, make fluid can flow back in order to realize the cushioning effect.

Optionally, a spring is arranged in the sliding groove, one end of the spring is connected with the valve core, and the other end of the spring is connected with the bottom of the sliding groove.

Through adopting above-mentioned technical scheme, under normal oil pressure, the spring promotes the case and slides outward towards the sliding tray, and under the too big oil pressure, when the case slided towards the sliding tray, the spring atress produced elastic deformation and compression to realize the effect of automatic start and stop oil pressure mouth.

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

1. the oil pressure is larger, the safety valve gradually closes the oil pressure port to reduce the discharge of oil liquid, so that part of the oil liquid flows back to the buffer tank from the oil pressure port, and the oil liquid enters between the cylinder body inner cavity and the piston from a gap between the spacer bush and the buffer part to realize the effects of buffering and decelerating the piston rod and the piston;

2. the safety valve has the effect of automatically opening and closing the oil pressure port;

3. the ring that wear-resistants plays and blocks between fluid passes through piston and the cylinder body inner wall, plays sealed effect, and the reducible piston of ring that wear-resistants simultaneously and cylinder body inner wall improve the life of piston and cylinder body because of the wearing and tearing that the looks friction received.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present application;

fig. 2 is an enlarged schematic view at a in the embodiment of the present application.

Description of reference numerals: 1. a cylinder body; 11. an oil pressure port; 111. a first oil port; 112. a second oil port; 12. a buffer tank; 13. a yielding groove; 14. caulking grooves; 2. a piston rod; 3. a piston; 31. a buffer section; 32. a compensation groove; 33. a first limit groove; 34. a second limit groove; 4. a spacer sleeve; 5. a safety valve; 51. a valve body; 52. a sliding groove; 53. an oil filler hole; 54. a valve core; 55. an oil guide hole; 56. an oil guide hole; 57. a spring; 6. a limiting ring; 7. an antiwear ring; 8. the Glare circle.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses hydro-cylinder with buffer function.

Referring to fig. 1 and 2, an oil cylinder with buffer function, including hollow cylinder body 1, piston rod 2 and piston 3 all coaxial sliding connect in cylinder body 1, cylinder body 1 is worn out to 2 one end of piston rod, the other end and piston 3 fixed connection, the circumference lateral wall of piston 3 and the laminating of the circumference inner wall of cylinder body 1, oil pressure mouth 11 has been seted up on cylinder body 1, oil pressure mouth 11 includes first hydraulic fluid port 111 and second hydraulic fluid port 112, the diapire of 1 inner chamber of cylinder body is run through to first hydraulic fluid port 111 one end, the other end links up and communicates with second hydraulic fluid port 112, the one end that first hydraulic fluid port 111 was kept away from to second hydraulic fluid port 112 runs through cylinder body 1 lateral wall.

Referring to fig. 1 and 2, a cylindrical buffer portion 31 is integrally formed on an end surface of the piston 3 away from the piston rod 2, a buffer groove 12 covering the first oil port 111 is formed in a bottom wall of an inner cavity of the cylinder 1, the buffer groove 12 is communicated with the first oil port 111, the buffer groove 12 is used for the buffer portion 31 to be inserted, a spacer 4 is embedded in a circumferential groove wall of the buffer groove 12 along the circumferential direction, a gap is formed between a circumferential inner wall of the spacer 4 and a circumferential outer wall of the buffer portion 31, and a safety valve 5 located in the second oil port 112 is installed on the cylinder 1.

Referring to fig. 1 and 2, the recessed bottom wall of the cylinder body 1 is provided with a yielding groove 13 covering the buffer groove 12, the yielding groove 13 and the valve body 51 have the same axial lead, the spacer bush 4 is embedded in the yielding groove 13, and the end face of the spacer bush 4 facing the yielding groove 13 is abutted to the bottom of the yielding groove 13. The caulking groove 14 is seted up along circumference on the circumference cell wall of the groove of stepping down 13, and the embedded spacing collar 6 that is equipped with by elastic material such as rubber of caulking groove 14, and spacing collar 6 keeps away from the terminal surface butt in the groove of stepping down 13 with spacer 4, and then realizes fixing spacer 4.

Referring to fig. 1 and 2, a compensation groove 32 is formed on the end surface of the piston 3 away from the piston rod 2 around the axis thereof, the compensation groove 32 corresponds to the abdicating groove 13, and part of the compensation groove 32 can be communicated with the abdicating groove 13. First spacing groove 33 has been seted up around self axial lead on the circumference lateral wall of piston 3, and the embedded ring 7 that wear that is equipped with of first spacing groove 33, the circumference outer wall of ring 7 that wear and the laminating of the circumference inner wall of cylinder body 1, and then make to be formed with gapped and become clearance fit between the circumference lateral wall of piston 3 and the circumference inner wall of cylinder body 1. A second limiting groove 34 is formed in the circumferential side wall of the piston 3 around the axis of the piston, a GREEN 8 is embedded in the second limiting groove 34, and the circumferential outer wall of the GREEN 8 is attached to the circumferential inner wall of the cylinder body 1.

Referring to fig. 1 and 2, the safety valve 5 includes a valve body 51 fixedly connected in the second oil port 112, the valve body 51 is disposed along an extending direction of the second oil port 112, and a circumferential outer wall of the valve body 51 abuts against a circumferential inner wall of the second oil port 112. One end of the valve body 51 facing the first oil port 111 is provided with a sliding groove 52, the other end is provided with an oil filling hole 53 penetrating through the bottom of the sliding groove 52, the valve body 51 is connected with a valve core 54 sliding along the extending direction of the sliding groove 52 in a sliding manner, the valve core 54 faces the sliding groove 52 and is provided with an oil guide hole 55, and the circumferential side wall of the valve core 54 is provided with an oil guide hole 56 communicated with the oil guide hole 55. A spring 57 which extends and retracts in the extending direction of the slide groove 52 is connected to the slide groove 52, and one end of the spring 57 is fixedly connected to the valve element 54 and the other end is fixedly connected to the bottom of the slide groove 52.

The implementation principle of the hydro-cylinder with buffer function of this application embodiment does:

in the unloading downward stroke, the piston 3 and the piston rod 2 slide towards the inner cavity of the cylinder body 1, so that the oil in the inner cavity of the cylinder body 1 sequentially passes through the buffer groove 12, the oil pressure port 11 and the safety valve 5 and is discharged out of the valve body 51, the buffer part 31 is inserted into the buffer groove 12, the gap formed by the spacer 4 and the buffer part 31 reduces the oil entering the hydraulic port 11, because of the large oil pressure, the valve core 54 is forced to slide towards the sliding groove 52, so that the oil guiding hole 56 is overlapped with the groove wall of the sliding groove 52, so as to limit the oil passing through the oil guide hole 56, close the oil pressure port 11, enable the oil to flow back, so as to reduce the discharge of oil liquid, make part of the oil liquid flow back to the buffer groove 12 from the oil pressure port 11, the oil liquid enters between the inner cavity of the cylinder 1 and the piston 3 from the gap between the spacer 4 and the buffer part 31, the effect of buffering and decelerating the piston rod 2 and the piston 3 is realized, and when the oil cylinder is applied to a forklift gantry, stable unloading and descending of the gantry can be ensured.

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

1. The utility model provides an hydro-cylinder with buffer function, includes hollow cylinder body (1), coaxial sliding is provided with piston rod (2) in cylinder body (1), cylinder body (1) is worn out to piston rod (2) one end, the other end is provided with piston (3), piston (3) laminating cylinder body (1) inner wall, be provided with on cylinder body (1) with oil pressure mouth (11), its characterized in that of inner chamber intercommunication: the one end that piston rod (2) were kept away from in piston (3) is provided with buffer portion (31), be provided with on the inner chamber diapire of cylinder body (1) dashpot (12) that are linked together with oil pressure mouth (11), dashpot (12) supply buffer portion (31) to insert, be provided with spacer (4) in dashpot (12), the circumference inner wall of spacer (4) is formed with the clearance with the circumference outer wall of buffer portion (31), be provided with on cylinder body (1) and be used for opening and close relief valve (5) of oil pressure mouth (11).

2. The oil cylinder with the buffering function as claimed in claim 1, wherein: the inner chamber diapire of cylinder body (1) is provided with the groove of stepping down (13) that covers dashpot (12), spacer sleeve (4) are inlayed and are located in the groove of stepping down (13).

3. The oil cylinder with the buffering function according to claim 2, characterized in that: the anti-collision limiting device is characterized in that an embedded groove (14) is formed in the circumferential groove wall of the abdicating groove (13), a limiting ring (6) is embedded in the embedded groove (14), and the limiting ring (6) is abutted to the spacer bush (4).

4. The oil cylinder with the buffering function according to claim 3, characterized in that: and one end of the piston (3) far away from the piston rod (2) is provided with a compensation groove (32) corresponding to the abdicating groove (13) around the axis line of the piston.

5. The oil cylinder with the buffering function according to claim 1, characterized in that: be provided with ring (7) of wearing to on the circumference lateral wall of piston (3), ring (7) and cylinder body (1) inner wall laminating wear resistant, piston (3) become clearance fit with cylinder body (1) inner wall.

6. The oil cylinder with the buffering function according to claim 1, characterized in that: the cylinder is characterized in that a GREEN ring (8) is arranged on the circumferential side wall of the piston (3), and the GREEN ring (8) is attached to the inner wall of the cylinder body (1).

7. The oil cylinder with the buffering function according to claim 1, characterized in that: the safety valve (5) comprises a valve body (51) arranged in the oil pressure port (11), one end of the valve body (51) is provided with a sliding groove (52), the other end of the valve body is provided with an oil filling hole (53) penetrating through the bottom of the sliding groove (52), a valve core (54) is arranged in the sliding groove (52) in a sliding mode, one end, facing the sliding groove (52), of the valve core (54) is provided with an oil guide hole (55), and an oil guide hole (56) communicated with the oil guide hole (55) is formed in the circumferential side wall of the valve core (54).

8. The oil cylinder with the buffering function according to claim 7, characterized in that: a spring (57) is arranged in the sliding groove (52), one end of the spring (57) is connected with the valve core (54), and the other end of the spring (57) is connected with the bottom of the sliding groove (52).