CN201412408Y - Floating type buffering hydro cylinder - Google Patents

Floating type buffering hydro cylinder Download PDF

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Publication number
CN201412408Y
CN201412408Y CN200920046635XU CN200920046635U CN201412408Y CN 201412408 Y CN201412408 Y CN 201412408Y CN 200920046635X U CN200920046635X U CN 200920046635XU CN 200920046635 U CN200920046635 U CN 200920046635U CN 201412408 Y CN201412408 Y CN 201412408Y
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CN
China
Prior art keywords
hole
piston rod
cylinder
cushion
buffer
Prior art date
Application number
CN200920046635XU
Other languages
Chinese (zh)
Inventor
汪立平
Original Assignee
江苏恒立高压油缸有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 江苏恒立高压油缸有限公司 filed Critical 江苏恒立高压油缸有限公司
Priority to CN200920046635XU priority Critical patent/CN201412408Y/en
Application granted granted Critical
Publication of CN201412408Y publication Critical patent/CN201412408Y/en

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Abstract

The utility model discloses a floating type buffering hydro cylinder, comprising a cylinder barrel, a cylinder bottom head, a piston rod and a piston; the extending direction of the piston rod is forward, and the retraction direction of the piston rod is backward, the rear end surface of the piston rod is provided with a buffering plunger which is integrated with the piston rod, a stepped hole arranged at the same axis of the piston rod is arranged on the buffering, the diameter of a small hole part of the stepped hole is more than the outer diameter of the piston rod, a buffer sleeve, and a retainer ring for holes, which can prevent the buffer sleeve from sliding out, are arranged in a large hole part in a floating way, a buffer hole is arranged on the buffer sleeve, after the buffering plunger enters in the buffer hole under the pushing of hydraulic oil, a buffer gap exists between the excircle of the buffering plunger and the buffer hole. In the utility model, the buffer sleeve is designed into a floating type, when the buffering plunger enters in the buffer hole, automatic centering can be carried out to reduce the buffer gas, thereby having better buffering effect and being capable of preventing the phenomenon that the piston of the hydro cylinder is retracted to the bottom of the hydro cylinder to generate striking; in addition, the starting performance of the hydro cylinder is good, and the floating type buffering hydro cylinder has simple structure and strong practicality.

Description

The floating-type cushion hydraulic jack

Technical field

The utility model relates to technical field of hydraulic oil cylinder, especially a kind of floating-type cushion hydraulic jack that prevents to produce when oil cylinder piston is withdrawn into cylinder bottom bump.

Background technique

Usually the used buffer structure design of hydraulic jack generally is buffer plunger of processing on piston rod, when piston-retraction arrives cylinder bottom, buffer plunger indentation cushion hole, the gap of cushion hole and buffer plunger is very little, make the oil return of oil hydraulic cylinder produce throttling action, produce back pressure, thereby play buffer function, the quality of its cushioning effect is by the gap length decision of buffer plunger and cushion hole.Buffer plunger and cushion hole generally are changeless in the structure in the past, can not automatic centering owing to there is inevitable machining error, the buffer gap can not be designed too little, otherwise be easy to stuck, so cushioning effect is bad; Also have plenty of at unsteady cushion collar of buffer plunger outside increase and play the automatic centering effect, but this cushion collar need improve surface hardness through quenching or nitriding treatment, the process-cycle is long, the cost height.

The model utility content

The technical problems to be solved in the utility model is: the deficiency that overcomes prior art, a kind of floating-type cushion hydraulic jack is provided, the floating-type cushion structure that it has can effectively prevent the impingement phenomenon that produces when oil cylinder piston is withdrawn into cylinder bottom, and is simple in structure, good buffer effect.

The technological scheme that its technical problem that solves the utility model adopts is: a kind of floating-type cushion hydraulic jack, comprise cylinder barrel, cylinder bottom head, piston rod and piston, it is the place ahead that the setting piston rod stretches out direction, otherwise be the rear, described cylinder bottom head is fixed in the cylinder barrel rear end, piston is fixed in the piston rod rear end, circle liquid sealing in its cylindrical and the cylinder barrel, piston is divided into rod chamber and rodless cavity with the inner chamber of cylinder barrel, cylinder bottom head is provided with and is used for the oil inlet hole that piston rod stretches out, has the buffer plunger that is structure as a whole with piston rod on the ear end face of piston rod, it is the shoulder hole of same axis that described cylinder bottom head is provided with piston rod, the little bore portion of shoulder hole communicates with oil inlet hole, and the diameter of little bore portion is greater than the external diameter of piston rod, big bore portion is positioned at the front end of cylinder bottom head, can float in the big bore portion and be provided with cushion collar and can prevent that cushion collar is to hole back-up ring that the rodless cavity direction skids off, has cushion hole on the described cushion collar, buffer plunger enters cushion hole under the hydraulic oil of rod chamber promotes after, have between the cylindrical of buffer plunger and the cushion hole and make hydraulic oil play the buffer gap of meter out effect.

Furtherly, for when oil cylinder starts, the hydraulic oil of oil inlet hole can enter rodless cavity promotion piston rod fast and stretch out, and described cushion collar comprises body and be located at the body cylindrical and annular uniform arc piece that the outside diameter that the arc piece constitutes is less than the diameter of the big bore portion of shoulder hole.

Further, described arc number of blocks is six, and with body be the integrative-structure of integral manufacturing.

When guaranteeing that buffer plunger enters cushion hole on the cushion collar, automatic centering better reduces the buffer gap, and the rearward end of described buffer plunger is a cone, and the front end of cushion hole has the female cone hole that matches with cone.

The beneficial effects of the utility model are: the utility model is designed to relocatable form with cushion collar, when buffer plunger enters cushion hole, can automatic centering to reduce the buffer gap, has cushioning effect preferably, can effectively prevent the impingement phenomenon that produces when oil cylinder piston is withdrawn into cylinder bottom, and the startability of oil cylinder is good, and is simple in structure, practical.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the working state schematic representation that the utility model enters buffering.

Fig. 3 is the partial enlarged drawing at the place of A shown in Fig. 2.

Working state schematic representation when Fig. 4 is the utility model startup.

Fig. 5 is the partial enlarged drawing at the place of B shown in Fig. 4.

Fig. 6 is the structural representation of cushion collar described in the utility model.

1. cylinder barrels, 11. rod chambers, 12. rodless cavities, 2. cylinder bottom heads, 21. oil inlet holes, 22. shoulder holes, 221. aperture parts, 222. big bore portion 3. piston rods 31. buffer plungers 4. pistons 5. cushion collars 51. cushion holes 52. bodies 53. arc pieces 6. hole back-up rings among the figure

Embodiment.

With mode of execution the utility model is further described in conjunction with the accompanying drawings now.These accompanying drawings are the schematic representation of simplification, basic structure of the present utility model only is described in a schematic way, so it only show the formation relevant with the utility model.

Concrete structure as a kind of floating-type cushion hydraulic jack of Fig. 1~shown in Figure 6, comprise cylinder barrel 1, cylinder bottom head 2, piston rod 3 and piston 4, it is the place ahead that setting piston rod 3 stretches out direction, otherwise be the rear, described cylinder bottom head 2 is fixed in cylinder barrel 1 rear end, piston 4 is fixed in piston rod 3 rear ends, circle liquid sealing in the cylindrical of piston 4 and the cylinder barrel 1, piston 4 is divided into rod chamber 11 and rodless cavity 12 with the inner chamber of cylinder barrel 1, cylinder bottom head 2 is provided with and is used for the oil inlet hole 21 that piston rod 3 stretches out, has the buffer plunger 31 that is structure as a whole with piston rod 3 on the ear end face of piston rod 3, have on the described cylinder bottom head 2 with piston rod 3 and be the shoulder hole 22 of same axis, the aperture part 221 of shoulder hole 22 communicates with oil inlet hole 21, and the diameter of aperture part 221 is greater than the external diameter of piston rod 3, big bore portion 222 is positioned at the front end of cylinder bottom head 2, in big bore portion 222, can float and be provided with cushion collar 5 and can prevent that cushion collar 5 is to hole usefulness back-up ring 6 that rodless cavity 12 directions skid off, has cushion hole 51 on the described cushion collar 5, buffer plunger 31 enters cushion hole 51 under the hydraulic oil of rod chamber 11 promotes after, have between the cylindrical of buffer plunger 31 and the cushion hole 51 and make hydraulic oil play the buffer gap of meter out effect.

As shown in Figure 6, described cushion collar 5 comprises body 52 and is located at body 52 cylindricals and annular uniform arc piece 53, arc piece 53 quantity are six, and with body 52 be the integrative-structure of integral manufacturing, cushion hole 51 is positioned at body 52 central positions, the outside diameter that described arc piece 53 constitutes is less than the diameter of the big bore portion 222 of shoulder hole 22, and also has the gap between big bore portion 222 inner side surfaces of cushion collar 5 and shoulder hole 22, cushion collar 5 floating grounds are placed in the big bore portion 222 of shoulder hole 22, space between the arc piece 53 can be when oil cylinder starts, the hydraulic oil of guaranteeing oil inlet hole 21 can enter rodless cavity 12 fast and act on the piston 4, stretch out thereby promote piston rod 3, make oil cylinder have startability faster.

The rearward end of described buffer plunger 31 is a conical structure, front end at cushion hole 51 has the female cone hole structure that matches with cone, like this when buffer plunger 31 enters cushion hole 51 on the cushion collar 5, and automatic centering better, reduce the buffer gap, improve cushioning effect.

Working principle of the present utility model is as follows: as Fig. 2, shown in Figure 3, when the hydraulic oil in the rod chamber 11 of cylinder barrel 1 promotes piston 4 withdrawal cylinder bottom heads 2, driving piston rod 3 withdraws synchronously, buffer plunger 31 on the piston rod 3 enters the cushion hole 51 on the cushion collar 5, owing to have the gap between buffer plunger 31 and the cushion hole 51, make the hydraulic oil of backflow produce meter out, thereby in rodless cavity 12, produce back pressure, arrow among Fig. 3 is represented the flow direction of hydraulic oil, at this moment, piston rod 3 reductions of speed slowly enter, withdrawal to piston 4 plays buffer function thus, avoid piston 4 and cylinder bottom head 2 to clash into, this moment, big bore portion 222 inner side surfaces of cushion collar 5 trailing flanks and shoulder hole 22 were close to; As Fig. 4, shown in Figure 5, when oil cylinder restarts, the hydraulic oil that oil inlet hole 21 enters promotes big bore portion 222 inner side surfaces of cushion collar 5 disengaging shoulder holes 22 and is blocked with back-up ring 6 by the hole, hydraulic oil flows to by the space between the arc piece 53 of cushion collar 5 and promotes piston 4 in the rodless cavity 12, arrow among Fig. 5 is represented the flow direction of hydraulic oil, make piston rod 3 stretch out cylinder barrel 1, thereby start oil cylinder fast.

Key of the present utility model is cushion collar 5 is designed to floating structure, when buffer plunger 31 enters cushion hole 51, and can automatic centering, reduce the buffer gap, when oil cylinder starts, by moving axially of cushion collar 5, hydraulic oil acts on rapidly on the piston 4, and the startability of oil cylinder is good.Unsteady buffering form of the present utility model, also can play the effect of one-way valve, can cancel oil cylinder during actual the use and start used one-way valve, the buffering of oil cylinder fore-end when this unsteady buffer structure can also be used for piston rod 3 and stretches out is to avoid that the oil cylinder front end is produced bump.

With above-mentioned foundation mode of execution of the present utility model is enlightenment, and by above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from the utility model technological thought.Technical scope of the present utility model is not limited to the content on the specification, must determine its technical scope according to the claim scope.

Claims (4)

1. floating-type cushion hydraulic jack, comprise cylinder barrel (1), cylinder bottom head (2), piston rod (3) and piston (4), it is the place ahead that setting piston rod (3) stretches out direction, otherwise be the rear, cylinder bottom head (2) is fixed in cylinder barrel (1) rear end, piston (4) is fixed in piston rod (3) rear end, circle liquid sealing in its cylindrical and the cylinder barrel (1), piston (4) is divided into rod chamber (11) and rodless cavity (12) with the inner chamber of cylinder barrel (1), cylinder bottom head (2) is provided with and is used for the oil inlet hole (21) that piston rod (3) stretches out, has the buffer plunger (31) that is structure as a whole with piston rod (3) on the ear end face of piston rod (3), it is characterized in that: described cylinder bottom head (2) is provided with piston rod (3) and is the shoulder hole of same axis (22), the little bore portion (221) of shoulder hole (22) communicates with oil inlet hole (21), and the diameter of little bore portion (221) is greater than the external diameter of piston rod (3), big bore portion (222) is positioned at the front end of cylinder bottom head (2), can float in the big bore portion (222) be provided with cushion collar (5) and can prevent cushion collar (5) to hole that rodless cavity (12) direction skids off with back-up ring (6), has cushion hole (51) on the cushion collar (5), buffer plunger (31) enters cushion hole (51) under the hydraulic oil of rod chamber (11) promotes after, have between the cylindrical of buffer plunger (31) and the cushion hole (51) and make hydraulic oil play the buffer gap of meter out effect.
2. floating-type cushion hydraulic jack according to claim 1, it is characterized in that: described cushion collar (5) comprises body (52) and is located at body (52) cylindrical and annular uniform arc piece (53) that the outside diameter that arc piece (53) constitutes is less than the diameter of the big bore portion (222) of shoulder hole (22).
3. floating-type cushion hydraulic jack according to claim 2 is characterized in that: described arc piece (53) quantity is six, and with body (52) be the integrative-structure of integral manufacturing.
4. floating-type cushion hydraulic jack according to claim 1 is characterized in that: the rearward end of described buffer plunger (31) has conical structure, and the front end of cushion hole (51) has the female cone hole that matches with cone.
CN200920046635XU 2009-06-17 2009-06-17 Floating type buffering hydro cylinder CN201412408Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200920046635XU CN201412408Y (en) 2009-06-17 2009-06-17 Floating type buffering hydro cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200920046635XU CN201412408Y (en) 2009-06-17 2009-06-17 Floating type buffering hydro cylinder

Publications (1)

Publication Number Publication Date
CN201412408Y true CN201412408Y (en) 2010-02-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN200920046635XU CN201412408Y (en) 2009-06-17 2009-06-17 Floating type buffering hydro cylinder

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Country Link
CN (1) CN201412408Y (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101963168A (en) * 2010-10-20 2011-02-02 小冶精通(天津)液压机械有限公司 Hydro-cylinder for performing buffering by using floating one-way valve sheet
CN102155458A (en) * 2010-07-23 2011-08-17 三一重工股份有限公司 Hydraulic oil cylinder and related devices of hydraulic oil cylinder, and hydraulic buffer system, excavator and concrete pump truck
CN102155457A (en) * 2010-07-23 2011-08-17 三一重工股份有限公司 Hydraulic oil cylinder, hydraulic buffering system, excavator and concrete pump truck
CN101598156B (en) * 2009-06-17 2012-03-14 江苏恒立高压油缸股份有限公司 Floating-type cushion cylinder
CN103148054A (en) * 2013-03-25 2013-06-12 许继集团有限公司 Oil buffer and piston assembly thereof
CN105041781A (en) * 2015-06-26 2015-11-11 北京航空航天大学 Simulation realization method of hydraulic cylinder with irregular tail end buffering mechanism

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101598156B (en) * 2009-06-17 2012-03-14 江苏恒立高压油缸股份有限公司 Floating-type cushion cylinder
CN102155458A (en) * 2010-07-23 2011-08-17 三一重工股份有限公司 Hydraulic oil cylinder and related devices of hydraulic oil cylinder, and hydraulic buffer system, excavator and concrete pump truck
CN102155457A (en) * 2010-07-23 2011-08-17 三一重工股份有限公司 Hydraulic oil cylinder, hydraulic buffering system, excavator and concrete pump truck
CN102155458B (en) * 2010-07-23 2012-07-04 三一重工股份有限公司 Hydraulic oil cylinder and related devices of hydraulic oil cylinder, and hydraulic buffer system, excavator and concrete pump truck
CN102155457B (en) * 2010-07-23 2012-07-18 三一重工股份有限公司 Hydraulic oil cylinder, hydraulic buffering system, excavator and concrete pump truck
CN101963168A (en) * 2010-10-20 2011-02-02 小冶精通(天津)液压机械有限公司 Hydro-cylinder for performing buffering by using floating one-way valve sheet
CN103148054A (en) * 2013-03-25 2013-06-12 许继集团有限公司 Oil buffer and piston assembly thereof
CN103148054B (en) * 2013-03-25 2016-03-02 许继集团有限公司 Oil dashpot and piston assembly thereof
CN105041781A (en) * 2015-06-26 2015-11-11 北京航空航天大学 Simulation realization method of hydraulic cylinder with irregular tail end buffering mechanism

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Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model
CP03 Change of name, title or address

Address after: 213169, Jiangsu, Changzhou province Wujin District snow weir industrial concentration area

Patentee after: Jiangsu Hengli High Pressure Oil Cylinder Co., Ltd.

Address before: District Jiangsu Hengli high cylinder Co. Ltd. weir Town of Wujin District of Jiangsu Province, Changzhou City snow snow 213169 weir Industrial

Patentee before: Jiangsu Hengli Highpressure Oil Cylinder Co., Ltd.

C56 Change in the name or address of the patentee

Owner name: JIANGSU HENGLI HIGH PRESSURE OIL CYLINDER CO., LTD

Free format text: FORMER NAME: JIANGSU HENGLI HIGHPRESSURE OIL CYLINDER CO., LTD.

AV01 Patent right actively abandoned

Granted publication date: 20100224

Effective date of abandoning: 20090617