CN214499627U - Novel oil cylinder rodless cavity floating buffer structure - Google Patents

Abstract

The utility model discloses a novel oil cylinder rodless cavity floating buffer structure, which comprises a cylinder body, a piston and a piston rod; a cavity for accommodating the piston and the piston rod is arranged in the cylinder body, the piston divides the cavity into a rod cavity and a rodless cavity, one end of the piston is connected with the piston rod, and the other end of the piston is connected with the buffer column; the piston rod is positioned in the rod cavity; a cylinder bottom inner hole is formed in one end, facing the rodless cavity, of the cylinder body, and the buffer column can extend into the cylinder bottom inner hole; the buffer column is characterized in that a buffer ring and a clamping ring are further sleeved on the circumferential outer side of the buffer column, and the clamping ring is located at one end of the buffer ring and is arranged close to the rodless cavity; the buffer ring is of a circular ring structure, a plurality of oil through holes communicated with the rodless cavity are formed in the end face of the buffer ring, and a rodless cavity oil port communicated with the inner hole of the cylinder bottom is formed in the surface of the cylinder body. The utility model discloses do not have stress concentration between well rand and the buffer column, product reliability and life obtain improving.

Description

Novel oil cylinder rodless cavity floating buffer structure

Technical Field

The utility model relates to a hydraulic cylinder technical field especially relates to a novel hydro-cylinder rodless chamber buffer structure that floats.

Background

Fig. 1 shows that current rodless chamber cushion cylinder's structure, mainly include cylinder body 1, piston 2, piston rod 3 and buffering post 4, when piston rod 3 withdraws, buffering post 4 gets into the cylinder bottom hole 501 of cylinder bottom 5 gradually, fluid can only get into rodless chamber hydraulic fluid port 9 through the annular gap that the hole of cylinder bottom hole 501 and the excircle of buffering post 4 formed, the area of crossing oil reduces, rodless chamber 7 oil pressure risees this moment, piston 2 moving speed slows down, the striking with cylinder bottom 5 when having reduced piston rod 3 and reaching the stroke end. The hardness of the piston rod 3 is equivalent to that of the cylinder body 1, in order to avoid hard contact and strain caused by misalignment of the buffer column 4 and the cylinder bottom inner hole 501, copper 6 is piled on the surface of the cylinder bottom inner hole 501, the copper layer has good wear resistance, the hardness is softer than that of the piston rod 3, and the surface of the piston rod 3 is prevented from being strained. When the piston rod 3 extends out, if oil enters the rodless cavity 7 from the rodless cavity oil port 9 only through an annular gap formed by the inner hole of the cylinder bottom inner hole 501 and the outer circle of the buffer column 4, the piston rod 3 is started slowly, so that the check valve 14 is usually added to enable the oil to enter the rodless cavity 7 through the check valve 14, and the starting is accelerated. This design suffers from several drawbacks: (1) the copper stacking process is complex, the production efficiency is low, preheating before welding is needed, heat preservation is carried out after welding, and the requirement on the surface state of a matrix is high; (2) the quality control of the copper pile is unstable, and the defects of air holes, cracks, slag inclusion, poor fusion with a matrix and the like are easy to occur; (3) whole buffer structure is fixed, and non-floating avoids the cylinder bottom hole and cushions the post disalignment and causes the eccentric wear, and the buffering clearance needs more than or equal to 0.2mm, and big clearance can lead to the shock-absorbing capacity to descend. (4) The requirement on the dimensional accuracy of the inner hole of the cylinder bottom is high, and the cylinder bottom is irregular in shape and is a die forging, so that the clamping error is large, and the quality is unstable; (5) after-sale maintenance is difficult, and the cylinder body can only be replaced after the copper layer is worn; (6) a check valve is additionally arranged, so that the cost is increased.

The patent number is CN201412408, the name is floating buffering hydraulic cylinder's patent is generally fixed unchangeable in order to solve cushion column and cylinder bottom hole, can not automatic centering, for this reason, add floatable cushion collar and can prevent the hole retaining ring of cushion collar to rodless chamber direction roll-off in the periphery of cushion column, the excircle of cushion collar sets up the arc piece of annular equipartition, form the logical oilhole between the adjacent arc piece, but this structure has following defect: (1) the arc-shaped block needs to be processed by wire cutting, and the wire cutting has low production efficiency and high cost. (2) The excircle of cushion collar is the echelonment, because of the cushion collar advances buffering and goes out buffering axial displacement repeatedly according to the hydro-cylinder, under the fluid thrust, strikes repeatedly with the retaining ring for the hole, and the closed angle of step department is stress concentration point, easily produces the crackle.

In summary, a buffer cylinder capable of automatically centering, having a simple processing technology and reducing stress concentration needs to be designed.

SUMMERY OF THE UTILITY MODEL

In order to solve among the prior art buffer hydraulic cylinder there is stress concentration point, easily produce the crackle, lead to the technical problem that product life reduces, the utility model provides a novel hydro-cylinder rodless chamber buffer structure that floats solves above-mentioned problem.

The utility model provides a technical scheme that its technical problem adopted is: a novel oil cylinder rodless cavity floating buffer structure comprises a cylinder body, a piston and a piston rod; a cavity for accommodating the piston and the piston rod is arranged in the cylinder body, the piston divides the cavity into a rod cavity and a rodless cavity, one end of the piston is connected with the piston rod, and the other end of the piston is connected with the buffer column; the piston rod is positioned in the rod cavity; a cylinder bottom inner hole is formed in one end, facing the rodless cavity, of the cylinder body, and the buffer column can extend into the cylinder bottom inner hole; the buffer column is characterized in that a buffer ring and a clamping ring are further sleeved on the circumferential outer side of the buffer column, and the clamping ring is located at one end of the buffer ring and is arranged close to the rodless cavity; the buffer ring is of a circular ring structure, a plurality of oil through holes communicated with the rodless cavity are formed in the end face of the buffer ring, and a rodless cavity oil port communicated with the inner hole of the cylinder bottom is formed in the surface of the cylinder body.

Furthermore, the buffer column is in clearance fit with the buffer ring.

Furthermore, cylinder body is gone to the one end in no pole chamber is equipped with the buffering mounting groove, buffer column and buffer ring are located in the buffering mounting groove, and the buffer ring presss from both sides and locates between the terminal surface of buffer column and buffering mounting groove.

Further, the buffer ring is in clearance fit with the radial outer surface of the buffer mounting groove, and the retainer ring is in interference fit with the radial outer surface of the buffer mounting groove.

Furthermore, the clamping ring is of a circular ring-shaped structure, and the inner diameter of the clamping ring is larger than the distance from the oil through hole to the central shaft of the cylinder body.

Furthermore, the center of the piston is penetrated with an integrally-manufactured stepped shaft structure, one end of the stepped shaft structure is a piston rod, and the other end of the stepped shaft structure is a buffer column.

Furthermore, the oil through holes are uniformly distributed along the circumferential direction of the buffer ring.

The utility model has the advantages that:

(1) novel unsteady buffer structure of hydro-cylinder rodless chamber, buffer ring overall structure slick and sly, during buffering post axial reciprocating motion, there is not stress concentration between rand and the buffering post, product reliability and life obtain improving.

(2) Novel unsteady buffer structure in hydro-cylinder rodless chamber, the through-hole of logical oilhole for lining up buffering ring terminal surface adopts ordinary turning and drilling process can process the completion, and manufacturing procedure is simple, production efficiency obtains improving.

(3) The utility model discloses a set up a buffering ring that can float in the cylinder bottom hole, the annular gap through buffering ring hole and buffering post excircle formation reaches the throttle effect, simultaneously because the buffering ring can radially float with the axial, can realize with buffering post automatic centering, greatly reduced buffering ring and the wearing and tearing of each other of buffering post.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a prior art hydraulic buffer ram;

fig. 2 is a schematic structural view of the novel floating buffer structure without a rod cavity of the oil cylinder according to the present invention in a buffering state (the direction indicated by the arrow is the moving direction of the hydraulic oil);

FIG. 3 is an enlarged view at A in FIG. 2;

fig. 4 is a schematic structural view of the novel floating buffer structure without a rod cavity of the oil cylinder according to the present invention in a reverse starting state (the direction indicated by the arrow is the moving direction of the hydraulic oil);

FIG. 5 is an enlarged view at B in FIG. 4;

fig. 6 is a front view of the cushion ring of the present invention.

In the figure, 1, a cylinder body, 2, a piston, 3, a piston rod, 4, a buffer column, 5, a cylinder bottom, 501, a cylinder bottom inner hole, 6, copper pile, 7, a rodless cavity, 8, a rod cavity, 9, a rodless cavity oil port, 10, a buffer ring, 11, a clamping ring, 12, an oil through hole, 13, a buffer mounting groove, 14 and a one-way valve.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A novel oil cylinder rodless cavity floating buffer structure comprises a cylinder body 1, a piston 2 and a piston rod 3; a cavity for accommodating the piston 2 and the piston rod 3 is arranged in the cylinder body 1, the piston 2 divides the cavity into a rod cavity 8 and a rodless cavity 7, one end of the piston 2 is connected with the piston rod 3, and the other end of the piston 2 is connected with the buffer column 4; the piston rod 3 is positioned in the rod cavity 8; one end of the cylinder body 1 facing the rodless cavity 7 is provided with a cylinder bottom inner hole 501, and the buffer column 4 can extend into the cylinder bottom inner hole 501; the circumferential outer side of the buffer column 4 is also sleeved with a buffer ring 10 and a clamping ring 11, and the clamping ring 11 is positioned at one end of the buffer ring 10 and is arranged close to the rodless cavity 7; the buffer ring 10 is of a circular ring structure, a plurality of oil through holes 12 communicated with the rodless cavity 7 are formed in the end face of the buffer ring 10, and a rodless cavity oil port 9 communicated with the cylinder bottom inner hole 501 is formed in the surface of the cylinder body 1.

As shown in fig. 2-6, the right end of the cylinder body 1 is a cylinder bottom 5, a rodless cavity oil port 9 is arranged on the cylinder bottom 5, a rod cavity 8 is located on the left side of the piston 2, a rodless cavity 7 is located on the right side of the piston 2, a cylinder bottom inner hole 501 is located on the left end surface of the cylinder bottom 5, the buffer ring 10 is a smooth circular cylinder, the retainer ring 11 is located on the left side of the buffer ring 10, the retainer ring 11 is axially fixed, and the buffer ring 10 is axially limited between the retainer ring 11 and the cylinder bottom inner hole 501.

The utility model discloses an among the concrete embodiment, the one end towards rodless chamber 7 on cylinder body 1 is equipped with buffer mounting groove 13, and cushion column 4 and buffering ring 10 are located buffer mounting groove 13, and buffering ring 10 presss from both sides and locates between the terminal surface of cushion column 4 and buffer mounting groove 13. As shown in fig. 3, the buffer mounting groove 13 protrudes outward in the radial direction of the cylinder bottom inner hole 501, the axial length of the buffer mounting groove 13 is smaller than the axial length of the cylinder bottom inner hole 501, the rodless cavity oil port 9 is located at the right side of the buffer mounting groove 13, and the lower end of the rodless cavity oil port 9 is connected with the cylinder bottom inner hole 501.

The buffer ring 10 can float axially and radially, when the buffer column 4 enters an inner hole of the buffer ring 10, the axial centers of the buffer column and the buffer ring can be centered through floating, and abrasion caused by the fact that the buffer column and the buffer ring are not concentric is greatly eliminated. The radial floating of the cushion ring 10 is achieved by the following structure: the buffer column 4 is in clearance fit with the buffer ring 10, that is, the inner hole diameter of the buffer ring 10 is larger than the outer diameter of the buffer column 4, and further, the radial outer surfaces of the buffer ring 10 and the buffer mounting groove 13 are in clearance fit. The clamping ring 11 is in interference fit with the radial outer surface of the buffer installation groove 13, so that the clamping ring 11 is axially fixed.

Preferably, the oil passing holes 12 are uniformly distributed in the circumferential direction of the cushion ring 10, thereby making the distribution of the hydraulic oil more uniform.

The rand 11 is the ring structure, and the internal diameter of rand 11 is greater than the distance of oil through hole 12 to cylinder body 1 center pin, and oil through hole 12 can be through the hole and the rodless chamber 7 intercommunication of rand 11.

In another embodiment of the present invention, an integrally formed stepped shaft structure is penetrated through the center of the piston 2, the one end of the stepped shaft structure is the piston rod 3, the other end of the stepped shaft structure is the buffer column 4, i.e. the buffer column 4 and the piston rod 3 are an integral structure, and the buffer column 4 is the endmost step of the stepped shaft structure.

The working principle is as follows: as shown in fig. 3, when the piston rod 3 retracts, the cushion column 4 gradually enters the inner hole of the cushion ring 10, at this time, the cushion ring 10 presses the inner end surface of the cylinder bottom inner hole 501 tightly under the action of oil to realize sealing, and the oil through hole 12 does not allow oil to pass, so that the oil is prevented from leaking and the buffering performance is influenced. Oil can only enter the rodless cavity oil port 9 through an annular gap formed by the inner hole of the buffer ring 10 and the outer circle of the buffer column 4, the oil is throttled, the oil pressure of the rodless cavity 7 rises at the moment, the motion speed of the piston 2 is reduced, and the impact of the piston 2 on the cylinder bottom 5 when reaching the stroke end point is reduced. As shown in fig. 5, when the piston rod 3 extends out, the buffer ring 10 is pressed against the collar 11 to the left under the action of oil, at this time, a gap is formed between the buffer ring 10 and the inner end surface of the cylinder bottom inner hole 501, and oil can enter the rodless cavity 7 from the rodless cavity oil port 9 through the oil through hole 12, so that the starting is accelerated.

In the description of the present invention, it is to be understood that the terms "center", "left", "right", "inner", "outer", "axial", "radial", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (7)

1. A novel oil cylinder rodless cavity floating buffer structure comprises a cylinder body (1), a piston (2) and a piston rod (3); a cavity for accommodating the piston (2) and the piston rod (3) is arranged in the cylinder body (1), the piston (2) divides the cavity into a rod cavity (8) and a rodless cavity (7), one end of the piston (2) is connected with the piston rod (3), and the other end of the piston (2) is connected with the buffer column (4); the piston rod (3) is positioned in the rod cavity (8); a cylinder bottom inner hole (501) is formed in one end, facing the rodless cavity (7), of the cylinder body (1), and the buffer column (4) can extend into the cylinder bottom inner hole (501); the method is characterized in that:

the buffer column (4) is also sleeved with a buffer ring (10) and a clamping ring (11) on the circumferential outer side, and the clamping ring (11) is positioned at one end of the buffer ring (10) and is arranged close to the rodless cavity (7); the buffer ring (10) is of a circular ring structure, a plurality of oil through holes (12) communicated with the rodless cavity (7) are formed in the end face of the buffer ring (10), and a rodless cavity oil port (9) communicated with the inner hole (501) in the cylinder bottom is formed in the surface of the cylinder body (1).

2. The novel oil cylinder rodless cavity floating buffering structure is characterized in that: the buffer column (4) is in clearance fit with the buffer ring (10).

3. The novel oil cylinder rodless cavity floating buffering structure is characterized in that: the cylinder body (1) is faced one end of rodless chamber (7) is equipped with buffer mounting groove (13), buffer column (4) and buffer ring (10) are located in buffer mounting groove (13), and buffer ring (10) press from both sides and locate between the terminal surface of buffer column (4) and buffer mounting groove (13).

4. The novel oil cylinder rodless cavity floating buffering structure of claim 3, characterized in that: cushion ring (10) with the radial surface of cushion mounting groove (13) is clearance fit, rand (11) with the radial surface of cushion mounting groove (13) is interference fit.

5. The novel oil cylinder rodless cavity floating buffering structure is characterized in that: the clamping ring (11) is of a circular ring structure, and the inner diameter of the clamping ring (11) is larger than the distance from the oil through hole (12) to the central shaft of the cylinder body (1).

6. The novel oil cylinder rodless cavity floating buffering structure is characterized in that: the center of piston (2) runs through and has integrated into one piece's ladder axle construction, the one end of ladder axle construction is piston rod (3), and the other end of ladder axle construction is bumping post (4).

7. The novel oil cylinder rodless cavity floating buffering structure is characterized in that: the oil through holes (12) are uniformly distributed along the circumferential direction of the buffer ring (10).

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