CN201908892U - Sleeve type lift cylinder - Google Patents

Abstract

The utility model discloses a sleeve type lift cylinder which comprises a cylinder body and a piston rod. The utility model is characterized in that: the front end of the piston rod is a rod head; a sealing function of the rod head divides the cylinder body into a front chamber and a back chamber; the back end of the piston rod is a joint; a hollow part in the piston rod is internally provided with an oil pipe which penetrates through the rod head; the back chamber is communicated with the hollow part; and a same plane of the joint is provided with two oil holes which are respectively communicated with the front chamber and the back chamber. The sleeve type lift cylinder has the following beneficial effects: high suitability for a flip-chip structure as the piston rod of the cylinder is fixed and the cylinder body performs telescopic movement, capability of saving all complicated step in mounting the square steel; capability of greatly reducing the material length of a telescopic girder and an overturning telescopic girder; saved production cost; and more saved space and position. More importantly, a problem of hydraulic pipe accumulation caused by the lifting of the lift cylinder is prevented, and the sleeve type lift cylinder is particularly suitable for the special environments such as downwell space.

Description

Telescopic hoist cylinder

Technical field

The utility model discloses a kind of hydraulic jack.Especially be fit to the use of multi-purpose grubber temporary support device under the mine.

Background technique

The hydraulic lifting device of existing down-hole multi-purpose grubber temporary support device generally is made up of three kinds of oil cylinders.They are respectively overturning oil cylinder, hoist cylinder and support cylinder.The overturning oil cylinder strut directly is connected by pivot pin with hoist cylinder cylinder body ear seat.And support cylinder will be realized its variable bit support function, then must seek a strong point on the scalable position of hoist cylinder.Promptly rely on the stroke of hoist cylinder piston rod to move the Support Position that changes support cylinder.Traditional oil cylinder generally all is to adopt cylinder body to fix, and piston rod carries out the structural type of lifting under the effect of hydraulic pressure.Such cylinder structure design seems very forced, passive in temporary support device.Such as, the piston rod surface of hoist cylinder is very smooth.Whole piston rod surface all can be in operation and can be recovered to cylinder interior along with the reduction of temporary support device.This just makes the piston rod of hoist cylinder directly to provide one effectively for support cylinder, fixable position.In the face of this difficult problem, most of manufacturer adopts usually the hoist cylinder piston rod is placed in the square steel, and support cylinder is hinged on the method for square steel upper surface.Drive the square steel motion by piston rod, realize the changeable of support cylinder position.Simultaneously, by welding or wear the synchronizing function that method that pin wants realizes square steel and piston rod, its manufacture process also is more loaded down with trivial details.

Summary of the invention

The purpose of this utility model provides and a kind ofly can the telescopic upside-down mounting hoist cylinder of oilhole be set to remedy the prior art deficiency at same end.

The utility model for realizing the technological scheme that purpose adopts is: telescopic hoist cylinder, comprise cylinder body and piston rod, and it is characterized in that: the piston rod front end is the bar head, the seal action of bar head is divided into ante-chamber and back cavity to cylinder body.The rear end is a connecting head.Oil pipe is arranged, oil pipe bar head in the hollow space in the piston rod.Back cavity is communicated with hollow space, and when the oil pipe oil-feed, cylinder body is passed, and promptly stretches out process; Between cylinder body and the piston rod sleeve, i.e. ante-chamber.When ante-chamber injected hydraulic oil, hydraulic pressure forced piston to drive cylinder body and makes contractile motion.Simultaneously, the same plane of connecting head is provided with two oilholes, is communicated with inside and outside two chambeies respectively.

Between cylinder body and piston rod, be provided with guide sleeve.

The beneficial effects of the utility model are: this oil cylinder piston bar is fixed, and cylinder body carries out fore and aft motion, very easily is adapted to inverted structure.Thus, the fulcrum of support cylinder also can directly be fixed on the cylinder body of hoist cylinder, realizes the function that its displacement is supported by stretching of cylinder body.So, need not look for square steel more in addition, more saved all the complicated procedures of forming that square steel brings has been installed.In addition, selecting this oil cylinder is the materials length that the hoist cylinder of temporary support device can also reduce extensible canopy and upset extensible canopy significantly, has saved cost of production, has liberated more space and position.The more important thing is, the built-in function of tube-in-tube structure just is that two hydraulic fluid ports are arranged on the same plane of piston club head and lay a good foundation, need not equally with common oil cylinder up and down to offer hydraulic fluid port in two ends at cylinder body, avoided by the hoist cylinder problem that the hydraulic tubing bring piles up that rises, this is especially suitable in particular surroundingss such as down-holes.

Below by embodiment, and in conjunction with the accompanying drawings the utility model is further described:

Description of drawings

Fig. 1 is this device schematic representation;

Fig. 2 is the sectional drawing of Fig. 1;

Fig. 3 is the schematic representation of cylinder barrel;

Fig. 4 is a parts assembling decomposing schematic representation;

Fig. 5 is the plane structure chart after the assembling.

Embodiment:

Embodiment:

Cylinder body 1 uphill process:

Cylinder body 1 is formed by connecting by cylinder tail 12 and cylinder barrel 13.

External pressure oil enters the oil duct 7 in the connecting head 4, enters into oil pipe 6 again, releases the ante-chamber 9 of cylinder body 1 by oil pipe 6 front ends.At this moment, because connecting head 4 is fixing, so under the pressure effect of pressure oil, cylinder body 1 can produce relative displacement, moves up.

At this moment, fuel cut-off, cylinder body 1 will the holding position.

Cylinder body 1 decline process:

In order to guarantee the conformity of movement locus, between cylinder body 1 and piston rod 2, be provided with guide sleeve 14.Guide sleeve 14 is welded on the cylinder body 1.

Pressure oil is entered hollow space 5 from oil duct 8, leak into back cavity 10 by the through hole 11 in the bar head 3 again, the pressure in the back cavity 10 can make guide sleeve 14 pressurizeds shrink, and guide sleeve 14 is connected on the cylinder body 1, thereby makes cylinder body 1 retracted for clearance.

At this moment, the pressure oil in the ante-chamber 9 can be through oil pipe 6, oil duct 7 oil returns.

In order to guarantee the conformity of movement locus, between cylinder body 1 and piston rod 2, be provided with guide sleeve 14.

In the whole process, piston rod 2 is fixing, and cylinder body 1 is flexible.

In Fig. 1, Fig. 2 and Fig. 4, be performance structure clearly, cylinder barrel 13 does not draw.

Claims (2)

1. telescopic hoist cylinder comprises cylinder body and piston rod, it is characterized in that: the piston rod front end is the bar head, and the seal action of bar head is divided into ante-chamber and back cavity to cylinder body; The piston rod rear end is a connecting head; Oil pipe is arranged, oil pipe bar head in the hollow space in the piston rod; Back cavity is communicated with hollow space; The same plane of connecting head is provided with two oilholes, is communicated with ante-chamber and back cavity respectively.

2. telescopic hoist cylinder as claimed in claim 1 is characterized in that: be provided with guide sleeve between cylinder body and piston rod.

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