CN201461600U

CN201461600U - Two-stage locking cylinder

Info

Publication number: CN201461600U
Application number: CN2009201255816U
Authority: CN
Inventors: 黄勇; 沈先锋; 陈光进
Original assignee: Guizhou Fengyang Hydraulic Ltd Co Ltd
Current assignee: Guizhou Fengyang Hydraulic Ltd Co Ltd
Priority date: 2009-07-29
Filing date: 2009-07-29
Publication date: 2010-05-12
Anticipated expiration: 2019-07-29

Abstract

The utility model discloses a two-stage locking cylinder belonging to hydraulic oil cylinders. The utility model aims to provide a locking oil cylinder having hydraulic and mechanic double locking functions. The locking cylinder comprises a cylinder body as well as a big piston rod assembly and a small piston rod assembly that are arranged in the cylinder body. The big piston rod assembly consists of a big piston (4) and a big piston sleeve rod (25) inserted in the big piston (4). The small piston rod assembly consists of a small piston arranged in the big piston sleeve rod (25) and a small piston rod inserted in the small piston. An oil inlet opening and a big oil opening are arranged on the cylinder body, an oil hole is arranged on the big piston sleeve rod (25), and an oil channel and a small oil opening are arranged on the small piston rod. A primary locking mechanism is arranged on the big piston rod assembly. The mechanism consists of a big compression ring (5) on the right end of the big piston (4), a big ring groove (6) on the big piston sleeve rod (25) and a big steel ball (16) on a big end cover (18). A secondary locking mechanism is arranged on the small piston rod assembly, and the secondary locking mechanism consists of a small compression ring (11), a small ring groove (12) and a small steel ball (15).

Description

Two-stage locking cylinder

Technical field: the utility model relates to a kind of hydraulic jack, relates in particular to a kind of hydraulic jack of tight mechanism with lock.

Background technique: twin-stage or multi-stage oil cylinder are the critical pieces of high-lift operation, height rescue equipment, because the length that piston rod stretches out is big, the skyborne time of stop is longer, therefore to the stationarity of piston rod movement, particularly the reliability to piston rod locking has all proposed very high requirement.Yet twin-stage or multi-stage oil cylinder are to adopt single hydraulic locking mechanism mostly at present, promptly by keeping the mode of high oil pressure to lock in the rodless cavity of oil cylinder; Therefore have that complex structure, sealed precision requirement are tight, manufacture cost is high, defective such as leak, safety reliability is relatively poor easily.

Summary of the invention: at the above-mentioned defective that exists in the prior art, the utility model aim to provide a kind of simple in structure, cost is low, has the two-stage locking cylinder of hydraulic pressure and mechanical dual locking function.

To achieve these goals, the utility model by the following technical solutions: it comprises cylinder body, is arranged on the large and small piston rod assembly in this cylinder body; Wherein, described big piston bar assembly is by being arranged on big piston in the described cylinder body, passing the big end cap of cylinder body sealing and the big piston loop bar that is inserted in this big piston are constituted, and described small piston rod assembly is by being arranged on small piston in the described big piston loop bar, passing the little end cap of this big piston cover rod seal and the small piston rod that is inserted in this small piston are constituted; The both sides that are positioned at big piston on cylinder body are respectively equipped with filler opening and big hydraulic fluid port, and the left end of big piston loop bar is provided with the oilhole that is communicated with cylinder body, and the big piston loop bar is communicated with the little hydraulic fluid port that is located at the small piston rod right-hand member by the oil duct that is located in the small piston rod; On big piston bar assembly, be provided with the one-level locking mechanism, this one-level locking mechanism by the big pressure ring that is fixed in the big piston right-hand member, be located at big annular groove corresponding on the big piston loop bar with this big pressure ring position, a plurality of big steel balls of being distributed on the big end cap constitute; On the small piston rod assembly, be provided with structure secondary locking mechanism identical with described one-level locking mechanism and that constitute by little pressure ring, little annular groove and small ball.

The big piston loop bar is provided with the big spring seat, is provided with big spring between this big spring seat and the big piston; Small piston rod is provided with the submissile spring abutment, is provided with little spring between this submissile spring abutment and the small piston rod; Position corresponding to each big steel ball on big end cap is provided with the big steel ball hold down gag, and this big steel ball hold down gag is by being arranged on big briquetting on the big end cap, being located at this big briquetting and constituting with the big spring that resets between the end cap greatly; Cover position corresponding to each small ball at small end and be provided with structure small ball hold down gag identical with described big steel ball hold down gag and that constitute by little briquetting, the little spring that resets; End face at big pressure ring is provided with big chamfering, is provided with little chamfering at the end face of little pressure ring.

Compared with the prior art, the utility model is because on the basis of traditional twin-stage oil cylinder, on the piston rod assembly of the two poles of the earth, respectively increased by a cover mechanical interlocking mechanism respectively, lock even if therefore take place to leak the piston rod that also can utilize mechanical interlocking mechanism to stretch out, thereby improved Security and reliability greatly; In addition, owing on the piston rod of the two poles of the earth, be provided with spring, so the stretching out, bounce back and all compare steadily of piston rod, overcome the bigger defective of traditional twin-stage oil cylinder piston bar impact shock in movement process.

Description of drawings:

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

Fig. 2 is the I place enlarged view among Fig. 1;

Fig. 3 is the II place enlarged view among Fig. 1.

Among the figure: the big pressure ring 5 big annular groove 6 big chamfering 7 submissile spring abutments 8 little springs 9 small pistons 10 little pressure ring 11 little annular groove 12 little chamfering 13 cylinder bodies 14 small balls 15 big steel balls 16 big hydraulic fluid port 17 big end cap 18 little hydraulic fluid port 19 small ends lids 20 of filler opening 1 big spring seat 2 big springs 3 big pistons 4 big spring 21 big briquettings 22 little spring 23 little briquetting 24 big piston loop bars 25 small piston rods 26 oil ducts 27 oilholes 28 that reset that reset

Embodiment: the utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment:

In Fig. 1～3, big end cap 18 is fixed on the right-hand member of cylinder body 14 and with its sealing, is provided with big piston bar assembly and small piston rod assembly in this cylinder body; Described big piston bar assembly is inserted in this big piston the other end by the big piston 4, the end that are arranged in the cylinder body 14 and passes big end cap 18 outwardly directed big piston loop bars 25 and constitute, the right section of this big piston loop bar is a sleeve-like configuration, and the right-hand member of big piston loop bar 25 is fixed with the small end lid 20 with this right side section sleeve sealing; Described small piston rod assembly is inserted in this small piston the other end and passes small end and cover 20 outwardly directed small piston rods 26 and constitute by being arranged on small piston 10, an end in the right section sleeves of big piston loop bar 25.Be provided with filler opening 1, be provided with big hydraulic fluid port 17 in the position near cylinder body 14 right-hand members at the left end of cylinder body 14, the left end of big piston loop bar 25 is provided with the oilhole 28 that the left chamber with cylinder body 14 is communicated with the left chamber of big piston loop bar 25 right side section sleeves; Position near right-hand member on small piston rod 26 is provided with little hydraulic fluid port 19, and this little hydraulic fluid port is communicated with the right chamber of big piston loop bar 25 right section sleeves by the oil duct 27 that is located in the small piston rod 26.On big piston bar assembly, be provided with the one-level locking mechanism, this one-level locking mechanism by the big pressure ring 5 that is fixed in big piston 4 right-hand members, be arranged on the big piston loop bar 25 and be positioned at the big annular groove 6 of this big pressure ring, a plurality of big steel balls 16 that are distributed on the big end cap 18 constitute; On the small piston rod assembly, be provided with the structure secondary locking mechanism identical with described one-level locking mechanism, this secondary locking mechanism by the little pressure ring 11 that is fixed in small piston 10 right-hand members, be arranged on the small piston rod 26 and be positioned at the little annular groove 12 of this little pressure ring, a plurality of small balls 15 that are distributed on the small end lid 20 constitute.

Steady in order to guarantee piston rod movement, the left end of big piston loop bar 25 is provided with big spring seat 2 by screw thread, is provided with big spring 3 between this big spring seat and big piston 4; The left end of small piston rod 26 is provided with submissile spring abutment 8 by screw thread, is provided with little spring 9 between this submissile spring abutment and the small piston rod 26.Go out for fear of steel ball slippage from end cap, position corresponding to each big steel ball 16 on big end cap 18 is provided with the big steel ball hold down gag, this big steel ball hold down gag is made of the big spring 21 that resets that is arranged on big briquetting 22 on the big end cap 18, be located between this big briquetting and the big end cap 18, and big briquetting 22 withstands big steel ball 16 by this big spring that resets; Position corresponding to each small ball 15 on small end lid 20 is provided with the structure small ball hold down gag identical with described big steel ball hold down gag, small end covers the little briquetting 24 on 20 to this small ball hold down gag, the little spring 23 that resets that is located between this little briquetting and the small end lid 20 constitutes by being arranged on, and little briquetting 20 withstands small ball 15 by this little spring that resets.For the ease of locking, be provided with at the end face of big pressure ring 5 and be convenient to big steel ball 16 and import big chamfering 7 between big piston loop bars 25 and the big pressure ring 5, be provided with the little chamfering of being convenient between small ball 15 importing small piston loop bars 26 and the little pressure ring 11 13 at the end face of little pressure ring 11.

Working principle: when fluid when filler opening 1 enters cylinder body 14, pressure oil acts on the left end of big piston 4 and big piston loop bar 25 respectively, big hydraulic fluid port 17 and little hydraulic fluid port 19 are in the oil return state, so big piston loop bar 25 and small piston loop bar 26 move right and stretch out from cylinder body 14; Because the internal diameter of cylinder body 14 is greater than the internal diameter of the right section sleeve of big piston loop bar 25, therefore the speed that will stretch out faster than the small piston rod assembly of the big piston bar assembly speed of stretching out. when the big chamfering 7 of big pressure ring 5 end faces contacts with big steel ball 16, because the big annular groove 6 on the big piston loop bar 25 is the position of no show big steel ball 16 still, big steel ball 16 is under the compressing of big pressure ring 5 all the time, and big piston loop bar 25 continues to move right under the effect of oil pressure and stretches out; When the big annular groove on the big piston loop bar 25 6 arrives the position of big steel ball 16, big steel ball 16 slowly slides in the big annular groove 6 under the effect of big chamfering 7 plane of inclination of big pressure ring 5 end faces, simultaneously big piston 4 continues to move right and promotes big briquetting 22 and compresses the big spring 21 that resets to the right, when the shaft shoulder of big piston loop bar 25 was run in the right side of big piston 4, the motion of big piston bar assembly stopped; Simultaneously, the small piston rod assembly continues to move right and stretches out, its movement process is identical with the movement process of big piston assembly. when fluid when big hydraulic fluid port 17 enters cylinder body 14, the right side that pressure oil acts on big piston 4 promotes it to left movement and compress big spring 3, the shaft shoulder of the right side of big piston 4 and big piston loop bar 25 disengages, and big piston loop bar 25 bounces back to left movement under the effect of big spring 3; Simultaneously, big chamfering 7 plane of inclination of big pressure ring 5 end faces discharge the compressing to big steel ball 16 gradually, so big steel ball 16 slippage from big annular groove 6 goes out, simultaneously big briquetting 22 resets under the effect of the big spring 21 that resets and big steel ball 16 is withstood, so finish the release of big piston assembly; The releasing process of small piston rod assembly is identical with the releasing process of big piston bar assembly, is not giving unnecessary details at this.

Claims

1. a two-stage locking cylinder comprises cylinder body, is arranged on the large and small piston rod assembly in this cylinder body; Wherein, described big piston bar assembly is by being arranged on big piston in the described cylinder body, passing the big end cap of cylinder body sealing and the big piston loop bar that is inserted in this big piston are constituted, and described small piston rod assembly is by being arranged on small piston in the described big piston loop bar, passing the little end cap of this big piston cover rod seal and the small piston rod that is inserted in this small piston are constituted; The both sides that are positioned at big piston on cylinder body are respectively equipped with filler opening and big hydraulic fluid port, and the left end of big piston loop bar is provided with the oilhole that is communicated with cylinder body, and the big piston loop bar is communicated with the little hydraulic fluid port that is located at the small piston rod right-hand member by the oil duct that is located in the small piston rod; It is characterized in that: on big piston bar assembly, be provided with the one-level locking mechanism, this one-level locking mechanism by the big pressure ring (5) that is fixed in big piston (4) right-hand member, be located at big piston loop bar (25) and go up the big annular groove (6) corresponding, be distributed on a plurality of big steel balls (16) formation on the big end cap (18) with this big pressure ring position; On the small piston rod assembly, be provided with structure secondary locking mechanism identical with described one-level locking mechanism and that constitute by little pressure ring (11), little annular groove (12) and small ball (15).

2. two-stage locking cylinder according to claim 1 is characterized in that: big piston loop bar (25) is provided with big spring seat (2), is provided with big spring (3) between this big spring seat and the big piston (4); Small piston rod (26) is provided with submissile spring abutment (8), is provided with little spring (9) between this submissile spring abutment and the small piston rod (26).

3. two-stage locking cylinder according to claim 1 and 2, it is characterized in that: the position of going up corresponding to each big steel ball (16) at big end cap (18) is provided with the big steel ball hold down gag, and this big steel ball hold down gag is by being arranged on big briquetting (22) on the big end cap (18), being located at the big spring that resets (21) formation between this big briquetting and the big end cap (18); Going up position corresponding to each small ball (15) at little end cap (20), to be provided with structure identical with described big steel ball hold down gag and by the small ball hold down gag of little briquetting (24), the little spring that resets (23) formation.

4. two-stage locking cylinder according to claim 1 and 2 is characterized in that: the end face at big pressure ring (5) is provided with big chamfering (7), is provided with little chamfering (13) at the end face of little pressure ring (11).

5. two-stage locking cylinder according to claim 3 is characterized in that: the end face at big pressure ring (5) is provided with big chamfering (7), is provided with little chamfering (13) at the end face of little pressure ring (11).