CN210240181U

CN210240181U - Hydraulic cylinder buffer device

Info

Publication number: CN210240181U
Application number: CN201920939003.XU
Authority: CN
Inventors: Junxin Wang; 王军新; Zhaoyin Yang; 杨兆银; Shouli Wang; 王寿利; Yuanchun Wang; 王元春; Baolei Zhan; 展宝磊; Aihui Lyu; 吕爱晖; Chen Xu; 徐晨
Original assignee: Shandong Iron and Steel Co Ltd
Current assignee: Shandong Iron and Steel Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-04-03
Anticipated expiration: 2029-06-21

Abstract

The utility model discloses a pneumatic cylinder buffer, the device includes: the device comprises a cylinder cover, a floating sleeve and a buffer plunger piston; be provided with the mounting groove with the coaxial intercommunication of oily passageway of crossing of hydraulic oil on the cylinder cap, float and sheathe in and be provided with strong magnetic adsorption spare, float the cover and establish in the mounting groove and laminate through magnetic force and cylinder cap. The floating sleeve is provided with a middle hole along the axial direction, the middle hole and the buffering plunger piston are coaxially arranged, and the buffering plunger piston is in clearance fit with the floating sleeve when inserted into the middle hole; the floating sleeve is provided with an oil passing hole along the axial direction, and when oil is fed into the oil passing channel, hydraulic oil jacks up the floating sleeve and flows out of the oil passing hole through a gap between the floating sleeve and a cylinder cover. The utility model discloses a pneumatic cylinder buffer, through the magnetic force actuation of cover and cylinder cap that floats, on can playing the basis of cushioning effect, the cover that floats during the oil feed is by jack-up, and the clearance between cover and the cylinder cap that floats constitutes big latus rectum oil circuit with the oilhole jointly, has improved the start-up speed of pneumatic cylinder.

Description

Hydraulic cylinder buffer device

Technical Field

The utility model relates to a hydraulic drive technical field especially relates to a pneumatic cylinder buffer.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion. The reciprocating motion device has simple structure and reliable work, can avoid a speed reducer when the reciprocating motion is realized, has no transmission clearance, and moves stably, thereby being widely applied to hydraulic systems of various machines.

In the process of the action of the hydraulic cylinder, in order to reduce the impact damage of the load of the hydraulic cylinder at the action tail end to the hydraulic cylinder, a buffer device needs to be additionally arranged at the stroke tail end of the hydraulic cylinder. When the piston moves to a position close to the cylinder covers, the buffer plunger on the piston and the buffer device form small clearance fit, a part of hydraulic oil is sealed between the piston and the cylinder covers at two ends, and the hydraulic oil is slowly released through the small clearance, so that the purpose of buffering is achieved.

Designers have found that the prior art suffers from at least the following problems: when the hydraulic cylinder is started, because the buffer plunger piston is in small clearance fit with the buffer device, the flow path of hydraulic oil is small, and large acting force is difficult to generate, so that the hydraulic cylinder is slow to start and even difficult to start.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem that exists among the above-mentioned prior art, the utility model provides a pneumatic cylinder buffer. The specific technical scheme is as follows:

a hydraulic cylinder cushioning apparatus, said apparatus comprising: the device comprises a cylinder cover, a floating sleeve and a buffer plunger piston; the cylinder cover is provided with an installation groove which is coaxially communicated with an oil passing channel of hydraulic oil, the floating sleeve is provided with a strong magnetic adsorption piece, and the floating sleeve is arranged in the installation groove and is attached to the cylinder cover through magnetic force; the buffering plunger piston is arranged on one side surface of the piston opposite to the cylinder cover, a middle hole is axially arranged on the floating sleeve, the middle hole and the buffering plunger piston are coaxially arranged, and the buffering plunger piston is in clearance fit with the floating sleeve when inserted into the middle hole; the floating sleeve is provided with an oil passing hole along the axial direction, and when oil enters the oil passing channel, hydraulic oil jacks up the floating sleeve, and passes through the floating sleeve and a gap between the cylinder covers flows out of the oil passing hole.

In a possible design, a limiting member is disposed at an upper portion of the mounting groove, and is used for limiting the floating sleeve in the mounting groove.

In a possible design, the limiting part is a baffle ring, and the inner diameter of the baffle ring is 2-5 cm smaller than the inner diameter of the floating sleeve.

In one possible embodiment, the stop element is a spring clip.

In one possible design, the outer diameter of the floating sleeve is smaller than the inner diameter of the mounting groove.

In one possible design, the end of the buffer plunger is of a reduced diameter structure.

In one possible embodiment, the intermediate bore of the floating sleeve has a smaller inner diameter than the oil passage.

In one possible design, the floating sleeve comprises a first part and a second part which are sequentially formed from inside to outside, the thickness of the first part is larger than that of the second part, and when the first part is attached to the cylinder cover, the second part is opposite to the cylinder cover in a spaced mode; the strong magnetic adsorption piece is arranged on the first portion, and the oil passing hole is arranged on the second portion.

In one possible design, the number of the strong magnetic adsorption pieces is multiple, and the strong magnetic adsorption pieces are uniformly distributed along the circumferential direction of the floating sleeve; and/or the number of the oil passing holes is multiple, and the oil passing holes are uniformly distributed along the circumferential direction of the floating sleeve.

In one possible design, the cylinder head is made of carbon steel or carbon steel alloy.

The utility model discloses technical scheme's main advantage as follows:

the utility model discloses a pneumatic cylinder buffer, through the magnetic force actuation of cover and cylinder cap that floats, on can playing the basis of cushioning effect, the cover that floats during the oil feed is by jack-up, and the clearance between cover and the cylinder cap that floats constitutes big latus rectum oil circuit with the oilhole jointly, has improved the start-up speed of pneumatic cylinder, reaches the quick start purpose. And the movable laminating of cover and cylinder cap that floats is accomplished through magnetic force adsorption piece, is convenient for reset, and the action is reliable, simple structure, dismouting maintenance is convenient.

Drawings

The accompanying drawings, which are set forth herein, serve to provide a further understanding of the embodiments of the present invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are illustrative of the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a schematic structural view of a hydraulic cylinder damping device according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a floating member in a hydraulic cylinder cushion according to an embodiment of the present invention;

fig. 3 is a top view of a floating member in a hydraulic cylinder cushion according to an embodiment of the present invention;

fig. 4 is a working schematic diagram of the hydraulic cylinder buffer device according to an embodiment of the present invention during piston buffering;

fig. 5 is a schematic diagram of the operation of the hydraulic cylinder damping device according to an embodiment of the present invention when starting.

Description of reference numerals:

1-cylinder cover, 2-floating sleeve, 3-buffer plunger, 4-strong magnetic adsorption piece, 5-piston, 6-middle hole, 7-oil hole, 8-limit piece.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.

The embodiment of the utility model provides a pneumatic cylinder buffer, as shown in figures 1 to 3, the device includes: cylinder cap 1, floating sleeve 2 and buffering plunger 3. Be provided with the mounting groove with the coaxial intercommunication of oily passageway of crossing of hydraulic oil on the cylinder cap 1, float and be provided with strong magnetic adsorption piece 4 on the cover 2, float and overlap 2 and set up in the mounting groove and laminate with cylinder cap 1 through magnetic force. The buffering plunger 3 is arranged on one side face, opposite to the cylinder cover 1, of the piston 5, a middle hole 6 is axially arranged on the floating sleeve 2, the middle hole 6 and the buffering plunger 3 are coaxially arranged, and the buffering plunger 3 is in clearance fit with the floating sleeve 2 when inserted into the middle hole 6. The floating sleeve 2 is provided with an oil passing hole 7 along the axial direction, and when oil enters the oil passing channel, hydraulic oil jacks up the floating sleeve 2 and flows out of the oil passing hole 7 through a gap between the floating sleeve 2 and the cylinder cover 1.

Following is right the embodiment of the utility model provides a pneumatic cylinder buffer's theory of operation and beneficial effect explain:

in the use, when piston 5 was close to cylinder cap 1, floating sleeve 2 was because of the magnetic force actuation on cylinder cap 1, and hydraulic oil in the cylinder body was to floating sleeve 2 application decurrent pressure this moment, and with the magnetic attraction syntropy, made floating sleeve 2 inseparabler with the laminating of cylinder cap 1. When the piston 5 moves to be close to the cylinder cover 1, the buffer piston 5 is inserted into the middle hole 6 of the floating sleeve 2, the buffer piston and the floating sleeve are in clearance fit, and hydraulic oil between the piston 5 and the cylinder cover 1 can only slowly flow out from a clearance between the buffer piston 5 and the floating sleeve 2. The piston 5 is slowly closed by the slow release of the hydraulic oil, so that the buffer purpose is achieved. A schematic of this process can be seen in fig. 4. When starting, hydraulic oil flows in from the oil passage of the cylinder cover 1, and the hydraulic pressure of the hydraulic oil is greater than the magnetic attraction force, so that the floating sleeve 2 floats upwards. The hydraulic oil flows out from the oil through hole 7 on the floating sleeve 2 after passing through the gap between the floating sleeve 2 and the cylinder head 1 (as shown in S1 in fig. 5). A schematic of this process can be seen in fig. 5. Through the movable laminating of floating sleeve 2 and cylinder cap 1 and set up oil hole 7 on floating sleeve 2, enlarged the oil circuit diameter when the oil feed, form the big latus rectum oil circuit, improve the start-up speed. And the magnetic adsorption piece is used for finishing the movable attachment of the floating sleeve 2 and the cylinder cover 1, the floating sleeve 2 is reliable in action and can automatically reset without arranging other additional resetting devices, the equipment structure is simplified, and the disassembly, the assembly and the maintenance are convenient.

It can be seen that, the embodiment of the utility model provides a pneumatic cylinder buffer, through the magnetic force actuation of unsteady cover 2 and cylinder cap 1, on can playing the cushioning effect's basis, unsteady cover 2 is by jack-up during the oil feed, and the clearance between unsteady cover 2 and the cylinder cap 1 constitutes big latus rectum oil circuit with oilhole 7 jointly, has improved the boot-up speed of pneumatic cylinder, reaches the quick start purpose. And the movable laminating of the floating sleeve 2 and the cylinder cover 1 is completed through the magnetic adsorption piece, the action is reliable, the structure is simple, and the disassembly, the assembly and the maintenance are convenient.

Wherein, the buffer plunger 3 is vertically connected on the side wall of the piston 5 and is coaxially arranged with the piston 5, so as to be aligned with the middle hole 6 of the floating sleeve 2. The fit clearance between the buffer plunger 3 and the middle hole 6 can be set according to the use requirement, and it can be understood that the smaller the fit clearance is, the stronger the buffer effect is. The larger the fit clearance, the lower the requirements on the machining accuracy and the assembling accuracy. The fit clearance may be 2-3 cm, for example, 2cm, 2.5cm, 3cm, etc.

The magnetic attraction of the strong magnetic adsorption member 4 should satisfy: when the piston 5 is close to the cylinder cover 1, the floating sleeve 2 is tightly attached to the cylinder cover 1, and the gap between the floating sleeve 2 jacked up during oil inlet and the cylinder cover 1 can pass through the oil passing amount of the preset amount. The diameter of the oil passing hole 7 is also determined according to the required oil passing amount. Technical personnel in the field can carry out the adaptability setting according to operating condition, the embodiment of the utility model provides an no longer give concrete numerical value.

Optionally, in the embodiment of the present invention, the upper portion of the mounting groove is provided with a limiting member 8 for limiting the floating sleeve 2 in the mounting groove. Through setting up locating part 8, avoid floating cover 2 to deviate from 1 interior entering cylinder body of cylinder cap in and influence the motion of piston 5, reliability safety is higher.

As an example, the limiting member 8 may be a baffle ring, and the inner diameter of the baffle ring is smaller than the outer diameter of the floating sleeve 2 to block the floating sleeve 2. The inner diameter of the floating sleeve 2 is selected to be as large as possible on the premise of meeting the limit requirement, so that the interference on the flow of hydraulic oil is avoided. Exemplarily, the inner diameter of the baffle ring can be 2-5 cm (for example, 2cm, 3cm, 5cm and the like) smaller than the inner diameter of the floating sleeve 2, and by the arrangement, the surface area of the baffle ring is smaller, the occupied space is smaller, the baffle ring can play a role in blocking the floating sleeve 2, and the interference on the flowing of hydraulic oil and the movement of the buffer plunger 3 can be avoided. The baffle ring is arranged on the inner wall of the mounting groove, and the upper surface of the baffle ring is flush with the upper surface of the cylinder cover 1 or slightly lower than the upper surface of the cylinder cover 1. It can be understood that, when the floating sleeve 2 is attached to the cylinder head 1, a certain distance is formed between the floating sleeve 2 and the limiting member 8, and the distance is the floating stroke of the floating sleeve 2.

As another example, the limiting member 8 may be a spring clip, which is elastically contacted with the floating sleeve 2, and damaged by contact collision or the like.

Optionally, the embodiment of the utility model provides an among the pneumatic cylinder buffer, the external diameter of cover 2 that floats is less than the internal diameter of mounting groove. A gap S2 is formed as shown in fig. 1. So set up, make the cover 2 that floats can be in the radial movement of minizone, reach the purpose with 3 automatic centering of buffering plunger, reduced the requirement to machining precision and assembly precision, avoided the wearing and tearing problem that brings because of axial deviation between buffering plunger 3 and the cylinder cap 1.

Wherein, the clearance between cover 2 and the mounting groove that floats can set for according to the user demand. For example, the difference between the outer diameter of the floating sleeve 2 and the inner diameter of the mounting groove may be 1/15-1/10 of the radius of the floating sleeve 2, for example, 1/15, 1/12, 1/10, etc., or may be 1-5 cm (for example, 1cm, 3cm, 5cm, etc.).

Further, as shown in fig. 1, the end of the buffer plunger 3 may have a diameter reduction structure (with the diameter gradually decreasing from top to bottom in the direction shown in the drawing). So set up, when buffering plunger 3 and floating cover 2 are incomplete to be aimed at, the tip diameter of buffering plunger 3 is less can insert in the centre bore, and buffering plunger 3 moves down the in-process and drives floating cover 2 along radial movement gradually until complete insertion. Through this undergauge structure, further reduce the alignment degree of difficulty.

Furthermore, in order to be matched with the reducing structure at the end part of the buffer plunger 3, the upper part of the middle hole 6 can also be provided with a reducing section, the inner diameter of the reducing section is gradually reduced from top to bottom, the alignment difficulty can be further reduced, and the insertion process is smoother. The reducing structure and the generating line of the reducing section can be straight lines or arc lines and the like.

Optionally, in the embodiment of the present invention, the inner diameter of the middle hole 6 of the floating sleeve 2 is smaller than the inner diameter of the oil passage. So set up, during the oil feed, hydraulic oil part strikes on cover 2 floats, is convenient for with 2 jack-ups of cover that float.

As shown in fig. 1 and 2, the floating sleeve 2 comprises a first portion and a second portion which are sequentially formed from inside to outside, the thickness of the first portion is larger than that of the second portion, and when the first portion is attached to the cylinder cover 1, the second portion is opposite to the cylinder cover 1 at intervals; the strong magnetic adsorption member 4 is arranged on the first part, and the oil passing hole 7 is arranged on the second part.

So set up, can make the laminating of floating sleeve 2 and cylinder cap 1 inseparabler, can make the floating sleeve 2 hydraulic oil flow more smoothly after the come-up again.

Optionally, in the embodiment of the present invention, as shown in fig. 3, the number of the strong magnetic adsorption members 4 is multiple, and the multiple strong magnetic adsorption members 4 are uniformly distributed along the circumferential direction of the floating sleeve 2; and/or the number of the oil passing holes 7 is multiple, and the oil passing holes 7 are uniformly distributed along the circumferential direction of the floating sleeve 2. So set up, distribution of power is more even, guarantees the laminating effect, and the floating member come-up process keeps the level floating, and hydraulic oil even flow does not produce the tipping force to the floating member.

Wherein, the quantity of strong magnetic adsorption piece 4 and oil passing hole 7 can be 4, and the contained angle of two adjacent strong magnetic adsorption pieces 4 and two adjacent oil passing holes 7 is 90 degrees. Fig. 3 shows the condition that the number of the strong magnetic adsorption pieces 4 and the number of the oil passing holes 7 are 6, and the included angles between two adjacent strong magnetic adsorption pieces 4 and two adjacent oil passing holes 7 are 60 degrees. Further, the strong magnetic adsorption member 4 and the oil passing hole 7 can be located on the same radius line.

The strong magnetic adsorption piece 4 is a strong magnetic material, the floating sleeve 2 can be provided with a blind hole for accommodating the strong magnetic adsorption piece 4, and the strong magnetic adsorption piece 4 can be fixed in the blind hole through installation such as an embedding mode to form an integrated structure with the floating sleeve 2. Alternatively, the strong magnetic adsorption member 4 may have a cylindrical structure.

The embodiment of the utility model provides an in, in order to guarantee magnetism to inhale the laminating effect, cylinder cap 1 is carbon steel or carbon steel alloy material, possesses stronger adsorption affinity, and possesses higher hardness and intensity, can satisfy the user demand.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; 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

1. A hydraulic cylinder cushion apparatus, comprising: the device comprises a cylinder cover (1), a floating sleeve (2) and a buffering plunger (3);

the cylinder cover (1) is provided with an installation groove which is coaxially communicated with an oil passing channel of hydraulic oil, the floating sleeve (2) is provided with a strong magnetic adsorption piece (4), and the floating sleeve (2) is arranged in the installation groove and is attached to the cylinder cover (1) through magnetic force;

the buffering plunger (3) is arranged on one side face, opposite to the cylinder cover (1), of the piston (5), a middle hole (6) is axially formed in the floating sleeve (2), the middle hole (6) and the buffering plunger (3) are coaxially arranged, and the buffering plunger (3) is in clearance fit with the floating sleeve (2) when inserted into the middle hole (6);

the floating sleeve (2) is provided with an oil passing hole (7) along the axial direction, when an oil inlet channel is used for oil inlet, hydraulic oil jacks up the floating sleeve (2), the floating sleeve (2) passes through, and a gap between the cylinder cover (1) is followed the oil passing hole (7) flows out.

2. Hydraulic cylinder damping arrangement according to claim 1, characterized in that the upper part of the mounting groove is provided with a stop (8) for stopping the floating sleeve (2) in the mounting groove.

3. The hydraulic cylinder damping device according to claim 2, characterized in that the limiting element (8) is a stop ring, the inner diameter of which is 2-5 cm smaller than the inner diameter of the floating sleeve (2).

4. Hydraulic cylinder damping device according to claim 2, characterized in that the stop element (8) is a spring clip.

5. Hydraulic cylinder damping arrangement according to claim 1, characterized in that the outer diameter of the floating sleeve (2) is smaller than the inner diameter of the mounting groove.

6. Hydraulic cylinder damping arrangement according to claim 5, characterized in that the damping plunger (3) is of reduced diameter construction at its end.

7. Hydraulic cylinder damping arrangement according to claim 1, characterized in that the intermediate bore (6) of the floating sleeve (2) has a smaller inner diameter than the inner diameter of the oil passage.

8. The hydraulic cylinder damping device according to claim 1, characterized in that the floating sleeve (2) comprises a first portion and a second portion formed sequentially from inside to outside, the thickness of the first portion is greater than that of the second portion, and the second portion is opposite to the cylinder head (1) in a spaced manner when the first portion is attached to the cylinder head (1);

the strong magnetic adsorption piece (4) is arranged on the first portion, and the oil passing hole (7) is arranged on the second portion.

9. The hydraulic cylinder buffer device according to claim 1 or 8, characterized in that the number of the strong magnetic adsorption members (4) is multiple, and the multiple strong magnetic adsorption members (4) are uniformly distributed along the circumferential direction of the floating sleeve (2); and/or the presence of a gas in the gas,

the number of the oil passing holes (7) is multiple, and the oil passing holes (7) are uniformly distributed along the circumferential direction of the floating sleeve (2).

10. Hydraulic cylinder damping device according to claim 1, characterized in that the cylinder head (1) is of carbon steel or a carbon steel alloy.