CN2272433Y - Controllable hydraulic telescopic rod - Google Patents

Abstract

The utility model relates to a mechanical field, particularly a light-duty and distance variable lifting and supporting device. An original product is an air spring, and a supporting rod can not be controlled to retract after extended out and can only be retracted by pressurizing forcefully. A combination valve is arranged inside a telescopic rod by the light-duty and distance variable lifting and supporting device. The two-way control of extension and retraction can be realized. The light-duty and distance variable lifting and supporting device has the advantages of compact structure and flexible and convenient use. The light-duty and distance variable lifting and supporting device also has interchangeability with the air spring, and can be widely used for industries of automobiles, textiles, medical service, construction, etc.

Description

The controlled hydraulic expansion link

The utility model relates to mechanical field, but the light-duty displacement elevate a turnable ladder bracing or strutting arrangement of sector applications such as automobile, weaving, medical treatment especially.

But the displacement strut bar of selling on the home market is mainly P series gas spring and K series gas spring at present, is the product of introducing external advanced technologies device fabrication.This type of gas spring is to be the accumulation of energy medium with high pressure gas, and pressurized seal is still not ideal enough, is prone to leakage, life-span is shorter, and main defective can not be shunk with arm cook control after to be the gas spring strut bar stretch, and will make its withdrawal with pressurization energetically, makes troubles to use.The hydraulic support body in but displacement supports is long-pending big, needs the auxilliary facilities that add such as fuel tank, oil pump, oil pipe, because that institute occupies is bigger, range of use is restricted, so use is convenient, flexible inadequately.

The purpose of this utility model provides a kind of flexible two-way controllable function that has, and volume is little, and is easy to use, but the shaft-like flexible bearing set of the controlled hydraulic of widespread use.

The main points of the utility model structure are: have middle plumber to make oil cylinder 3 and tubule control oil cylinder 11 in the big outer tube extrusome 2, extrusome 2 one ends have that expansion link and piston 4 and expansion link guiding block up 1, expansion link reseting pressuring spring 21, and the other end has control stalk and piston 12.And control stalk guiding is stifled 13, control stalk spring 10, the middle part is provided with the combination valve that can realize stretching and contract two-way control in extrusome 2 pipes, combination valve also is shaft-like, its outside is a combination valve valve body 4, interior is combination valve spool 7, spring 19 is adjusted for combination valve pressure in the combination valve center, and combination valve has check valve 18 near control oil cylinder 11 1 ends, near operating cylinder 3 one ends stage clip plus-minus screw 6 is arranged.Combination valve valve body 9 middle parts are oil groove 25 once, and 1-2 fuel return hole arranged in its groove, and a back leakage groove 26 is arranged on the combination valve spool 7, and 1-2 fuel return hole arranged in its groove.In the plumber make to establish on oil cylinder 3 tube walls 1-2 overflow weir 27, its position is in the control stalk piston 4 strokes position, piston right side of to the utmost point prescribing a time limit.Near operating cylinder 3 one ends O-ring seals 5 is arranged on the combination valve valve body 9, there are 2 O-ring seals 20 at combination valve spool 7 middle parts.Expansion link guiding stifled 1 has endoporus O-ring seals 23 and outer garden O-ring seals 24.Expansion link guiding stifled 1 has interior O-ring seals 23 and outer O-ring seals 24, expansion link guiding stifled 1 inboard backbone sealing ring 22 in addition, O-ring seals 8 is arranged on the expansion link piston 4, in the control stalk guiding stifled 13 O-ring seals 15 is arranged, O-ring seals 17 is arranged on the control stalk piston 12, and there is backbone sealing ring 16 stifled 13 inboards of control stalk guiding.

Be full of hydraulic oil in the big outer tube extrusome 2 of controlled hydraulic expansion link, the preceding oiling sealing of product export does not need to add any power oil sources again in the use.

Effect of the present utility model: can conveniently control the expansion link bidirectional-movement of stretching and contract, flexible operation freely.Compact conformation, volume is little, is convenient to install, use, reliable operation, the life-span is long.This hydraulically extensible bar and P series and K series gas spring profile and connection, control mechanism are identical, except that possess receipts, the controllable function that contracts, have two kinds of gas spring functions of P, K concurrently, has interchangeability in the use, thereby enlarged its range of use, can be widely used in automobile, trac., medicine equipment, textile machine, vehicle for construction and aviation, shipping industry.

Brief Description Of Drawings: Fig. 1 is controlled hydraulic expansion link vertical section structure figure, Fig. 2 is a combination valve longitudinal profile constructional drawing, among the figure 1 for expansion link guiding stifled, 2 is big outer tube extrusome, 3 make oil cylinder for middle plumber, 4 is expansion link and piston, 5 is combination valve valve body O-ring seals, 6 is the stage clip plus-minus screw, 7 is the combination valve spool, 8 are flexible piston O-ring seals, 9 is the combination valve valve body, 10 is the control stalk spring, 11 are tubule control oil cylinder, and 12 be control stalk and piston, and 13 block up for control stalk leads, 14 are the oil nozzle of living, 15 are the stifled O-ring seals of control stalk guiding, and 16 are the stifled backbone sealing ring of control stalk guiding, and 17 is control stalk piston O-ring seals, 18 is check valve, 19 are combination valve pressure adjustment spring, and 20 is combination valve spool O-ring seals, and 21 is the expansion link reseting pressuring spring, 22 are the stifled backbone sealing ring of expansion link guiding, 23 are the stifled endoporus O-ring seals of expansion link guiding, and 24 are the stifled outer garden of expansion link guiding O-ring seals, and 25 is combination valve valve body back leakage groove and fuel return hole, 26 is combination valve spool back leakage groove and fuel return hole, and 27 is overflow weir.Arrow is an assembly direction among Fig. 2.

Reach working process in conjunction with the accompanying drawings and describe content of the present utility model in detail: add external force push lever and piston 12 during use, compression control bar spring 10, piston 12 right-to-lefts are moved, and check valve 18 choke-outs at this moment force hydraulic oil to act on combination valve spool 7, it is moved to the left, open oil circuit, make hydraulic oil enter the right-hand member of the piston 4 in the operating cylinder 3, and promote piston 4 compression expansion link reseting pressuring springs 21, expansion link is stretched out, reach running condition.When shrinking as need, i.e. push lever and piston 12 again, when control stalk and piston 12 are pressed left, when expansion link piston 4 walks to end position, hydraulic oil flow to the bassoon extrusome 2 from operating cylinder 3 from overflow weir 27, control stalk piston 12 continues to press left, when compression control bar spring 10 is moved to the left to suitable position, its top contacts with combination valve spool 7 tops, and make combination valve spool 7 compression combined valve pressure adjust spring 19 to moving left to suitable position, the back leakage groove and the fuel return hole 25 of combination valve spool 7 are alignd with combination valve valve body back leakage groove and fuel return hole 26, oil hydraulic circuit is opened, at this moment the hydraulic oil of piston 4 right-hand members releases by fuel return hole and back leakage groove in the operating cylinder 3, and at this moment under the effect of expansion link retracing spring 21, expansion link piston 4 is automatically withdrawn into reference position.When control stalk and piston 12 needn't have the promotion of external force during at control oil cylinder 11 high order ends again, under the effect of control stalk spring 10, control stalk 12 moves and gets back to reference position from left to right, at this moment control stalk piston 12 left ends in tubule control oil cylinder 11 form instantaneous vacuum state, the hydraulic oil of control oil cylinder 11 outsides just passes through the left chamber of control stalk piston 12 in the check valve 18 automatic control of access oil cylinders 11, be next working cycle oil of substituting the bad for the good, control stalk and piston 12 also return to reference position.

Embodiment 1: the controlled hydraulic expansion link is series of products, can design according to the dimensions of using needs, as one of them is:

1, hydraulically extensible body diameter D=32mm,

2, hydraulically extensible body total length L=270mm,

3, expansion link forced stroke l=100mm,

4, hydraulic fluid pressure coefficient h=0.8.

Claims (3)

1, a kind of controlled hydraulic expansion link, there is middle plumber to make oil cylinder (3) and tubule control oil cylinder (11) in the big outer tube extrusome (2), extrusome (2) one ends have expansion link and piston (4) and expansion link guiding stifled (1), expansion link reseting pressuring spring (21), the other end has control stalk and piston (12) and control stalk guiding stifled (13), control stalk spring (10), it is characterized in that the middle part is provided with the combination valve that can realize flexible two-way control in extrusome (2) pipe, combination valve also is shaft-like, its outside is combination valve valve body (9), interior is combination valve spool (7), spring (19) is adjusted for combination valve pressure in the combination valve center, combination valve has check valve (18) near control oil cylinder (11) one ends, near operating cylinder (3) one ends stage clip plus-minus screw (6) is arranged.

2, according to the described controlled hydraulic expansion link of claim 1, it is characterized in that combination valve valve body (9) middle part oil groove (25) once, 1-2 fuel return hole arranged in the groove, a back leakage groove (26) is arranged on the combination valve spool (7), 1-2 fuel return hole arranged in its groove.

3, according to the described controlled hydraulic expansion link of claim 1, the plumber does to establish 1-2 overflow weir (27) on oil cylinder (3) tube wall in it is characterized in that, its position is in expansion link piston (4) the stroke position, piston right side of to the utmost point prescribing a time limit.

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