CN214617299U - Piston structure, oil cylinder and telescopic arm - Google Patents

Abstract

The utility model provides a piston structure, hydro-cylinder and flexible arm, wherein piston structure includes piston rod, piston and buffering plunger, buffering plunger pass through the connecting piece with the connection can be dismantled to the tip of piston rod, the piston cover is established the tip outside of piston rod, and the parcel the connecting piece, be provided with fixed subassembly on the piston, fixed subassembly with the connection can be dismantled to the piston, be suitable for right the piston with the piston rod produces and prevents its relative slip's axial spacing. The utility model provides a piston structure, hydro-cylinder and flexible arm, buffering plunger pass through the connecting piece can dismantle with the piston rod and be connected, and the buffering plunger can be changed in the dismouting of being convenient for, and the piston wraps in the connecting piece outside, can play the guard action to the connecting piece, carries on spacing production not hard up between avoiding buffering plunger and the piston rod to the connecting piece simultaneously.

Description

Piston structure, oil cylinder and telescopic arm

Technical Field

The utility model relates to a hydraulic machine technical field especially relates to a piston structure, hydro-cylinder and flexible arm.

Background

In the working process of the oil cylinder, when the piston rod extends out or retracts to the limit position, the end face of the piston can generate large inertia force and impact load on the end cover and the bottom surface, the damage of the hydraulic oil cylinder can be caused, and a buffer device needs to be arranged in the oil cylinder to ensure the stability of mechanical work when the oil cylinder runs to the tail end of a stroke. The buffering plunger and the piston rod in part of the buffering devices are integrally formed, so that the buffering plunger and the piston rod are not convenient to disassemble, assemble and replace.

SUMMERY OF THE UTILITY MODEL

The utility model provides a piston structure, hydro-cylinder and flexible arm for solve the problem that the dismouting of being not convenient for of buffering plunger was changed among the prior art.

The utility model provides a piston structure, include: piston rod, piston and buffering plunger, buffering plunger pass through the connecting piece with the connection can be dismantled to the tip of piston rod, the piston cover is established the tip outside of piston rod, and the parcel the connecting piece, be provided with fixed subassembly on the piston, fixed subassembly with the connection can be dismantled to the piston, be suitable for right the piston with the piston rod produces and prevents its relative slip's axial spacing.

According to the utility model provides a pair of piston structure, the piston rod tip is provided with the holding tank, buffering plunger one end peg graft in the holding tank, be provided with first through-hole on the piston rod lateral wall, be provided with the second through-hole on the buffering plunger lateral wall, first through-hole with the second through-hole coaxial line, the connecting piece is the round pin axle, the round pin axle is worn to locate first through-hole with the second through-hole.

According to the utility model provides a pair of piston structure, fixed subassembly includes stop pin and spacing ball, be provided with the screw hole on the piston, screw hole eccentric settings, stop pin threaded connection be in the threaded hole, be provided with the spacing groove on the piston rod, spacing ball is located in the threaded hole, and one side with stop pin tip butt, opposite side embedding the spacing inslot.

According to the utility model provides a pair of piston structure, the spacing groove is for winding the ring channel of piston rod circumference.

According to the utility model provides a pair of piston structure, the transversal V font of personally submitting of spacing groove.

According to the utility model provides a pair of piston structure, the piston includes piston body and spacing portion, spacing portion with this end of body of piston meets, the biggest radial dimension of spacing portion is less than the radial dimension of piston body, the screw hole sets up in spacing portion.

According to the utility model provides a pair of piston structure, be formed with the installation face on the spacing portion lateral wall, the installation face is followed the axial extension and the perpendicular to of spacing portion the radial of spacing portion, the screw hole perpendicular to installation face.

According to the utility model provides a pair of piston structure, spacing portion with piston body integrated into one piece.

The utility model also provides an oil cylinder, including cylinder, end cover and any one above, piston structure, the end cover with the connection can be dismantled to the tip of cylinder, piston rod, piston and the coaxial setting of buffering plunger are in the cylinder, be provided with the buffer hole on the end cover, the buffer hole with buffering plunger coaxial line, the diameter in buffer hole is less than buffering plunger's diameter.

The utility model also provides a telescopic boom, including above arbitrary piston structure or foretell hydro-cylinder.

The utility model provides a piston structure, hydro-cylinder and flexible arm, buffering plunger pass through the connecting piece can dismantle with the piston rod and be connected, and the buffering plunger can be changed in the dismouting of being convenient for, and the piston wraps in the connecting piece outside, can play the guard action to the connecting piece, carries on spacingly to the connecting piece simultaneously, avoids producing between buffering plunger and the piston rod not hard up.

The buffer plunger is inserted into the piston rod, and the connecting piece is a pin shaft, so that the firm connection structure between the buffer plunger and the piston rod can be ensured. Under the limiting effect of the piston on the connecting piece, the connecting piece can be prevented from falling off, and the connecting piece can be conveniently pulled out after the piston is taken down.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a longitudinal sectional view of a piston structure provided by the present invention;

fig. 2 is a cross-sectional view of a piston structure provided by the present invention;

fig. 3 is a longitudinal sectional view of an oil cylinder provided by the present invention;

fig. 4 is a cross-sectional view of an oil cylinder provided by the present invention.

Reference numerals:

100. a piston rod; 110. Accommodating grooves; 120. A first through hole;

130. a limiting groove; 140. An avoidance groove; 200. A piston;

210. a piston body; 220. A limiting part; 221. A threaded hole;

222. a mounting surface; 300. A buffer plunger; 310. A second through hole;

400. a connecting member; 500. A limit pin; 600. A limiting ball;

700. a cylinder barrel; 800. An end cap; 810. And a buffer hole.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The piston structure of the embodiment of the present invention, which includes the piston rod 100, the piston 200 and the cushion plunger 300, is described below with reference to fig. 1 and 2.

The damping plunger 300 is of a cylindrical structure, and the damping plunger 300 is coaxial with the piston rod 100. One end of the buffer plunger 300 is detachably connected with one end of the piston rod 100 through a connecting piece 400, and the buffer plunger 300 is fixed with the piston rod 100 under the action of the connecting piece 400.

The piston 200 is sleeved outside the piston rod 100 and surrounds the connecting piece 400, so that protection and limit can be formed on the connecting piece 400. When the buffering plunger 300 needs to be replaced, the piston 200 needs to be removed first, and then the buffering plunger 300 can be detached and replaced.

Be provided with fixed subassembly on the piston 200, fixed subassembly and piston 200 can be dismantled and be connected, and fixed subassembly can produce axial limiting displacement to piston 200 and piston rod 100, avoids piston 200 and piston rod 100 to produce relative slip, from this, except can realizing piston structure's basic function, can also further avoid producing between buffering plunger 300 and the piston rod 100 not hard up.

Optionally, the end of the piston rod 100 is provided with a receiving groove 110. The receiving groove 110 extends along the axial direction of the piston rod 100, and one end of the damping plunger 300 is inserted into the receiving groove 110. The piston rod 100 is provided with a first through hole 120 on a side wall thereof, the first through hole 120 is disposed along a radial direction of the piston rod 100, and one end thereof extends into the receiving groove 110. The damping plunger 300 is provided with a second through hole 310, and the second through hole 310 has the same diameter as the first through hole 120 and is coaxial. The connecting member 400 is a pin, and the pin simultaneously penetrates through the first through hole 120 and the second through hole 310. The buffer plunger 300 and the piston 200 can be detachably coupled by the coupling member 400. In addition, since the connecting member 400 connects the piston 200 and the buffering plunger 300 in a radial inserting and pulling manner, when the piston 200 is wrapped around the outer side of the connecting member 400, the connecting member 400 cannot move axially, so that the purpose of preventing the connecting member 400 from being separated from the piston 200 and the buffering plunger 300 is achieved.

Optionally, an avoiding groove 140 is formed in the outer wall of the piston rod 100, the open end of the first through hole 120 is located in the avoiding groove 140, after the connecting piece 400 is inserted into the first through hole 120 and the second through hole 310, the outward end of the connecting piece 400 is hidden in the avoiding groove 140, the end of the connecting piece 400 is prevented from protruding out of the surface of the piston rod 100, and the connecting piece 400 can be more conveniently pulled out when the buffering plunger 300 needs to be replaced.

In an embodiment of the present invention, the piston 200 is provided with a threaded hole 221, the threaded hole 221 is eccentrically disposed, one end of the threaded hole 221 extends to the outer wall of the piston 200, and the other end extends to the inner wall of the piston 200. The piston rod 100 is provided with a stopper groove 130, and the stopper groove 130 is aligned with an end of the screw hole 221. The fixing component comprises a limit pin 500 and a limit ball 600, the limit pin 500 is connected with the piston 200 through a threaded hole 221, the limit ball 600 is arranged in the threaded hole 221, one side of the limit ball is abutted against the limit pin 500, and the other side of the limit ball is embedded into the limit groove 130. The spacing ball 600 is a rigid member and can be made of stainless steel. When the piston 200 is impacted, the limiting ball 600 in the threaded hole 221 extrudes the limiting nail 500 along the radial direction of the limiting nail 500, so that the friction force between the threads of the limiting nail 500 and the internal threads of the threaded hole 221 is increased, and the anti-loosening effect is achieved.

Alternatively, the position-limiting groove 130 is an annular groove around the circumference of the piston rod 100, so that it can be determined that the position-limiting ball 600 is inserted into the position-limiting groove 130 after the relative positions of the piston 200 and the piston rod 100 in the axial direction are aligned.

Optionally, the cross section of the limiting groove 130 is V-shaped, the groove surface of the limiting groove 130 abuts against the limiting ball 600, and when the piston 200 is impacted, the groove surface of the limiting groove 130 provides a supporting force perpendicular to the groove surface of the limiting groove 130 for the limiting ball 600, and the supporting force can be decomposed into a component force along the axial direction of the piston rod 100 and a component force along the radial direction of the limiting nail 500. Wherein, the component force along the axial direction of the piston rod 100 counteracts the supporting force of the inner wall of the threaded hole 221 to the limiting ball 600, and the component force along the radial direction of the limiting nail 500 acts on the limiting ball 600 to extrude the limiting nail 500, so that the friction force between the thread of the limiting nail 500 and the internal thread of the threaded hole 221 is increased.

The piston 200 comprises a piston body 210 and a limiting part 220, wherein the piston body 210 is of a cylindrical structure and is suitable for being connected with the cylinder 700 to form sliding seal with the cylinder 700, the limiting part 220 is arranged at the end part of the piston body 210, the maximum radial dimension of the limiting part 220 is smaller than that of the piston body 210, and the threaded hole 221 is arranged on the limiting part 220. After the piston structure is installed in the cylinder 700, a gap is formed between the limiting part 220 and the inner wall of the cylinder 700, so that the end part of the limiting nail 500 can be prevented from being scraped against the inner wall of the cylinder 700.

Optionally, the limiting portion 220 is formed with a mounting surface 222, the mounting surface 222 extends along an axial direction of the limiting portion 220 and is perpendicular to a radial direction of the limiting portion 220, and the threaded hole 221 is perpendicular to the mounting surface 222. This facilitates processing of the screw hole 221 in the stopper portion 220 and installation of the stopper pin 500 into the screw hole 221.

Optionally, the position-limiting portion 220 is configured as a hexagonal prism structure, and the mounting surface 222 is one of the side surfaces of the position-limiting portion 220. This facilitates not only the machining of the threaded hole 221 but also the rotating operation of the piston 200 by a tool such as a hexagonal wrench.

The limiting part 220 and the piston body 210 are integrally formed, so that the production and installation steps of the piston 200 can be simplified, and the structural strength of the piston 200 is ensured.

In an alternative, the piston body 210 is provided with an internal thread on the inner wall thereof, and the piston rod 100 is provided with an external thread on the outer wall thereof, and the piston body 210 is threadedly coupled with the piston rod 100. The threaded connection structure of the piston body 210 and the piston rod 100 and the fixing component together play a role in axial limiting, and the stability of the connection structure of the piston 200 and the piston rod 100 can be further enhanced.

Referring to fig. 3 and 4, in an embodiment of the present invention, there is provided a cylinder including a cylinder 700, an end cap 800, and a piston structure in any of the above embodiments. The end cap 800 is detachably connected to the end of the cylinder 700 by bolts and forms a seal. The piston rod 100, the piston 200 and the buffer plunger 300 are coaxially arranged in the cylinder 700, the piston 200 is in contact sliding fit with the inner wall of the cylinder 700, and the piston 200 divides the cylinder 700 into two chambers.

The end cap 800 is provided with a buffer hole 810, the buffer hole 810 is a cylindrical hole, and one end of the buffer hole 810 is communicated with the cylinder 700. The damping bore 810 is coaxial with the damping plunger 300, and the diameter of the damping bore 810 is greater than the diameter of the damping plunger 300. The buffering plunger 300 is located at one end, close to the buffering hole 810, of the piston rod 100, when the piston rod 100 moves towards the direction close to the buffering hole 810, the buffering plunger 300 can be inserted into the buffering hole 810, a gap is formed between the outer wall of the buffering plunger 300 and the inner wall of the buffering hole 810, and hydraulic oil in the buffering hole 810 can flow into the cylinder 700 through the gap to achieve buffering. Buffering plunger 300 and buffering hole 810 are cylindrical structure, and buffer pressure is steady, can guarantee the hydro-cylinder and move the stability when forming the end.

In an embodiment of the present invention, there is further provided a telescopic boom, which includes the piston structure in any of the above embodiments or the oil cylinder in any of the above embodiments. The telescopic arm with the structure has the advantages of stable operation, low noise, reliable structure, convenience in disassembly, assembly and maintenance and the like.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A piston structure, comprising: piston rod, piston and buffering plunger, buffering plunger pass through the connecting piece with the connection can be dismantled to the tip of piston rod, the piston cover is established the tip outside of piston rod, and the parcel the connecting piece, be provided with fixed subassembly on the piston, fixed subassembly with the connection can be dismantled to the piston, be suitable for right the piston with the piston rod produces and prevents its relative slip's axial spacing.

2. The piston structure as claimed in claim 1, wherein the end of the piston rod is provided with a receiving groove, one end of the buffering plunger is inserted into the receiving groove, the side wall of the piston rod is provided with a first through hole, the side wall of the buffering plunger is provided with a second through hole, the first through hole and the second through hole are coaxial, the connecting member is a pin shaft, and the pin shaft is inserted into the first through hole and the second through hole.

3. The piston structure according to claim 1, wherein the fixing component comprises a limit pin and a limit ball, the piston is provided with a threaded hole, the threaded hole is eccentrically arranged, the limit pin is in threaded connection with the threaded hole, the piston rod is provided with a limit groove, the limit ball is positioned in the threaded hole, one side of the limit ball is abutted against the end part of the limit pin, and the other side of the limit ball is embedded in the limit groove.

4. A piston arrangement according to claim 3, wherein the limiting groove is an annular groove around the circumference of the piston rod.

5. The piston structure of claim 3 wherein said spacing groove is V-shaped in cross section.

6. The piston structure according to any one of claims 3 to 5, wherein said piston comprises a piston body and a stopper portion, said stopper portion is joined to said piston body end portion, a maximum radial dimension of said stopper portion is smaller than a radial dimension of said piston body, and said threaded hole is provided in said stopper portion.

7. The piston structure according to claim 6, wherein a mounting surface is formed on the side wall of said stopper portion, said mounting surface extending in the axial direction of said stopper portion and being perpendicular to the radial direction of said stopper portion, and said threaded hole being perpendicular to said mounting surface.

8. The piston structure of claim 6 wherein said retainer is integrally formed with said piston body.

9. An oil cylinder, characterized by, including cylinder, end cover and according to claim 1 to 8 any piston structure, the end cover with the tip of cylinder can be dismantled and be connected, piston rod, piston and buffering plunger coaxial setting are in the cylinder, be provided with the buffer hole on the end cover, the buffer hole with buffering plunger coaxial, the diameter of buffer hole is less than the diameter of buffering plunger.

10. A telescopic boom, comprising a piston arrangement according to any of claims 1 to 8 or a cylinder according to claim 9.

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