CN203606216U

CN203606216U - Hydraulic horizontal pushing clamp

Info

Publication number: CN203606216U
Application number: CN201320817577.2U
Authority: CN
Inventors: 胡伟萍; 胡凤英
Original assignee: Shanghai General Domain Test Equipment Co Ltd
Current assignee: Shanghai General Domain Test Equipment Co Ltd
Priority date: 2013-12-11
Filing date: 2013-12-11
Publication date: 2014-05-21
Anticipated expiration: 2023-12-11

Abstract

The utility model relates to a hydraulic horizontal pushing clamp which comprises a clamp body, two inner sleeves, two pistons, two hydraulic cylinders, two clamp blocks, a guide block, two barrier strips, a clamping oil pipe, a loosening oil pipe and a synchronous valve. The hydraulic horizontal pushing clamp is simple in structure, reliable in performances, high in synchronization precision, low in cost, simple to maintain, convenient in replacement of the clamp blocks and low in pressure pulse; mechanical abrasion is not caused in the clamp, and impurities such as scrap iron are not produced, so that a hydraulic system is maintained to be clean all the time; a plurality of problems of the traditional horizontal pushing clamp are solved; the hydraulic horizontal pushing clamp has obvious technical progress.

Description

Hydraulic horizontal-pushing fixture

Technical field

The utility model belongs to horizontal sliding fixture field, relates in particular to a kind of hydraulic horizontal-pushing fixture.

Background technology

Fixture is the critical component on material stretch test machine, and its effect is that tested sample two ends are clamped securely, guarantees that sample there will not be skidding under the condition of maximum test force.Hydraulic horizontal-pushing fixture is the novel clamp occurring in recent years.Its basic functional principle is, relies on the clamping cylinder that is arranged on two positioned opposite on a clamp body, and the clamping piston that pressure oil promotes two positioned opposite directly clamps sample.The holding force of fixture equals the area of clamping cylinder and the product of working pressure.

Guarantee that hydraulic horizontal-pushing fixture normally uses, have two key elements to be guaranteed.The one, must prevent that clamping piston rotates under the effect of eccentric moment under sample condition not entirely on the center; The 2nd, guarantee left and right sides clamping piston synchronizing moving.

At present, traditional hydraulic horizontal-pushing fixture has the following disadvantages on anti-rotation structure and synchronizing linkage:

1, in tension test process, due to the prolongation of material, clamping piston under the promotion of hydraulic oil by occurring small displacement, to compensate the reduction of sample thickness.Stop pin or anti-rotation side's tenon are bearing turning torque simultaneously, mating surface generation relative sliding.Under fully loaded transportation condition, stop pin or anti-rotation side's tenon easily wear and tear, and form Powdered iron pin, and these iron pins will enter hydraulic system, cause hydraulic valve to damage when serious, and fixture inner seal is damaged, thereby causes hydraulic horizontal-pushing fixture fault, causes economic loss.

2, be limited to physical dimension, little at unbalance loading serious condition, stop pin easily ruptures, and causes fixture not work, and clamping piston, clamping cylinder damage, and cause heavy economic losses.

3, for the horizontal sliding fixture that adopts centering type clamping piston structure, clamp body, after sample clamps, before tensile sample, has just produced huge additional turning torque, and additional turning torque size equals the product of clamping force and eccentric distance.This additional turning torque is identical with the turning torque direction that tensile force produces, and therefore clamp body must bear larger load, and under the identical condition of basic size, must reduce its serviceable life.The situation that is Split type structure for clamping piston and piston rod, its attachment screw will bear because of the sample moment that centering does not produce, and its attachment screw has the risk of being cut off.

4, for the horizontal sliding fixture that adopts rack-and-pinion synchronizing linkage and hinged synchronizing linkage, its complex structure, assembling difficulty, maintenance requires higher.Having under unbalance loading condition, mechanism holds damage.

5, difficulty is installed, changed to fixture block.

Utility model content

Based on this, for above-mentioned technical matters, provide a kind of hydraulic horizontal-pushing fixture.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

A kind of hydraulic horizontal-pushing fixture, comprise clamp body, two inner sleeves, two pistons, two hydraulic cylinders, two fixture blocks, orienting lug, two blend stops, clamp oil pipe, unclamp oil pipe and synchronous valve, described clamp body is provided with the through hole that runs through its both sides, and is provided with at the middle part of this clamp body the U-lag that blocks described through hole; Described two inner sleeves are located at respectively in the through hole of described U-lag both sides in opposite directions, and the flange end of each inner sleeve is all fixed with a side outer face of described through hole; Described two pistons lay respectively at described through hole both sides, the piston rod of these two pistons is arranged in respectively in described two inner sleeves, and the head end of each piston rod is all visited in described U-lag, and the top of described head end is provided with female dovetail groove, and the both sides of this head end are perpendicular; Described two hydraulic cylinders are all tubular, and described two hydraulic cylinders are sheathed on respectively outside described two pistons, and the end face of described hydraulic cylinder and the outer face of described clamp body are fixed, and its cylinder mouth coordinates with the flange end cylindrical of described inner sleeve; On described two fixture blocks, be equipped with and the male dovetail portion of described female dovetail groove adaptation, described fixture block is fixed on described piston rod by described public dovetail portion; Described orienting lug is fixed on a side inwall of described U-lag, and it has the vertical spigot surface being affixed with a side perpendicular of described head end; Described two blend stops are individually fixed on the opposite side perpendicular of described two piston rod head ends; Described clamping oil pipe and unclamp oil pipe and be communicated with described two hydraulic cylinders, described synchronous valve is located at described clamping oil pipe and is unclamped on the pipeline of oil pipe.

This programme also comprises high pressure accumulator, and described high pressure accumulator is located on the pipeline of described clamping oil pipe.

In described synchronous valve, there is correction bridge road.

The inwall of described inner sleeve is provided with three annular grooves, in these three annular grooves, is respectively equipped with O-ring seal, wear ring and dust ring, between the flange end of described inner sleeve and described hydraulic cylinder, is provided with O-ring seal.

Between described piston and described hydraulic cylinder, be provided with O-ring seal.

The utility model is simple in structure, dependable performance, synchronization accuracy is high, cost economy, safeguard simple, fixture block change convenient, pressure pulse is little, and fixture inside does not have mechanical wear, can not produce the impurity such as iron pin, remain the clean of hydraulic system, overcome the problems that traditional horizontal sliding fixture exists, there is obvious technical progress.

Accompanying drawing explanation

Be elaborated below in conjunction with the drawings and specific embodiments the utility model:

Fig. 1 is sectional structure schematic diagram of the present utility model;

Fig. 2 is plan structure schematic diagram of the present utility model;

Fig. 3 is backsight structural representation of the present utility model;

Fig. 4 is the A-A cut-open view of Fig. 1.

Embodiment

As Figure 1-4, a kind of hydraulic horizontal-pushing fixture, comprises clamp body 110, two inner sleeves 120, two pistons 130, two hydraulic cylinders 140, two fixture blocks 150, orienting lug 160, two blend stops 170, clamps oil pipe 180, unclamps oil pipe 190 and synchronous valve 198.

Clamp body 110 is provided with the through hole that runs through its both sides, and is provided with at the middle part of this clamp body 110 U-lag that blocks above-mentioned through hole.

Particularly, U-lag is semi open model structure, is convenient to installation and the replacing of fixture block 150.

Two inner sleeves 120 are located at respectively in the through hole of U-lag both sides in opposite directions, and the flange end 121 of each inner sleeve 120 is all fixed with the counterbore bottom surface of a side outer face of through hole.

Two pistons 130 lay respectively at through hole both sides, the piston rod 131 of these two pistons 130 is arranged in respectively in two inner sleeves 120, and the head end of each piston rod 131 is all visited in U-lag, and the top of head end is provided with female dovetail groove, and the both sides of this head end are perpendicular.

Two hydraulic cylinders 140 are all tubular, are sheathed on respectively outside two pistons 130, and the outer face of the end face of hydraulic cylinder 140 and clamp body 110 is fixed by axial screw, and its cylinder mouth coordinates with the flange end cylindrical of inner sleeve.

On two fixture blocks 150, be equipped with and the male dovetail portion 151 of female dovetail groove adaptation, fixture block 150 is fixed on piston rod 131 by public dovetail portion 151.

As shown in Figure 3, orienting lug 160 is fixed on by mounting screw 194 on a side inwall of U-lag, and it has the vertical spigot surface 161 being affixed with a side perpendicular of piston rod 131 head ends, referring to Fig. 1.

As shown in Fig. 1 and Fig. 4, two blend stops 170 are fixed on the opposite side perpendicular of two piston rod 131 head ends by screw respectively, in order to stop that piston rod 131 returns in the through hole of clamp body 110.

Clamp oil pipe 180 and pass into hydraulic oil, promote piston 130 and stretch out, clamp sample; Unclamp oil pipe 190 and pass into hydraulic oil, piston 130 is retracted, and sample unclamps.

In the time there is unbalance loading in piston 130, make a side perpendicular of fixture block 150 be close to the vertical spigot surface 161 of orienting lug 160, provided and the trimming moment of unbalance loading moment opposite direction by vertical spigot surface 161, therefore fixture block 150 just can not rotate; Because fixture block 150 is to be connected by dovetail with piston rod 131, and due to the barrier effect of blend stop 170, piston 130 is also limited to rotate.Therefore horizontal sliding fixture provided by the utility model need to not arrange rotation-preventing mechanism in inside, does not also need to adopt eccentric structure to prevent from rotating, and therefore fixture inside does not have mechanical wear, can not produce the impurity such as iron pin, remains the clean of hydraulic system.

The inwall of inner sleeve 120 is provided with three annular grooves, in these three annular grooves, is respectively equipped with O-ring seal 195, wear ring 196 and dust ring 197, between the flange end 121 of inner sleeve 120 and hydraulic cylinder 140, is provided with O-ring seal 195.

Between piston 130 and hydraulic cylinder 140, be provided with O-ring seal 195.

Clamp oil pipe 180 and unclamp oil pipe 190 and be communicated with two hydraulic cylinders 140, synchronous valve 198 is located at clamping oil pipe 180 and is unclamped on the pipeline of oil pipe 190.

Synchronous valve 198 is high-precision control element, can control mismachining tolerance and the surfaceness of two ends piston 130 and hydraulic cylinder 140, and the area of two ends hydraulic cylinder 140 is equated, the resistance of motion approaches.

The inner wear ring 196 of installing of inner sleeve 120 is manufactured by the compound substance of low friction ratio, can compensate machining error, and synchronous valve 198 has pressure compensation, and synchronization accuracy can reach in 1%.

Meanwhile, have correction bridge road in synchronous valve 198, correction bridge road is arranged between two branch's oil circuits, can correct two ends oil circuit streaming error, makes four pistons 130 of lower clamp can automatically correct synchronism deviation, meets the centering requirement of tension test completely.

In addition; clamping on the pipeline of oil pipe 180, high pressure accumulator 199 also can be set, for supplementing inner minute leakage; absorption pressure pulse; especially in sample fracture moment, piston 130 produces and retreats under recoil strength effect, causes hydraulic cylinder 140 pressure pulse of interior generation moment; this pressure pulse may cause fixture inner seal and hydraulic system to be damaged; high pressure accumulator 17 can absorb this pressure pulse, shield jig and hydraulic system, extension device serviceable life.

But, those of ordinary skill in the art will be appreciated that, above embodiment is only for the utility model is described, and be not used as restriction of the present utility model, as long as within the scope of connotation of the present utility model, variation, modification to the above embodiment all will drop within the scope of claims of the present utility model.

Claims

1. a hydraulic horizontal-pushing fixture, it is characterized in that, comprise clamp body, two inner sleeves, two pistons, two hydraulic cylinders, two fixture blocks, orienting lug, two blend stops, clamp oil pipe, unclamp oil pipe and synchronous valve, described clamp body is provided with the through hole that runs through its both sides, and is provided with at the middle part of this clamp body the U-lag that blocks described through hole; Described two inner sleeves are located at respectively in the through hole of described U-lag both sides in opposite directions, and the flange end of each inner sleeve is all fixed with a side outer face of described through hole; Described two pistons lay respectively at described through hole both sides, the piston rod of these two pistons is arranged in respectively in described two inner sleeves, and the head end of each piston rod is all visited in described U-lag, and the top of described head end is provided with female dovetail groove, and the both sides of this head end are perpendicular; Described two hydraulic cylinders are all tubular, and described two hydraulic cylinders are sheathed on respectively outside described two pistons, and the end face of described hydraulic cylinder and the outer face of described clamp body are fixed, and its cylinder mouth coordinates with the flange end cylindrical of described inner sleeve; On described two fixture blocks, be equipped with and the male dovetail portion of described female dovetail groove adaptation, described fixture block is fixed on described piston rod by described public dovetail portion; Described orienting lug is fixed on a side inwall of described U-lag, and it has the vertical spigot surface being affixed with a side perpendicular of described head end; Described two blend stops are individually fixed on the opposite side perpendicular of described two piston rod head ends; Described clamping oil pipe and unclamp oil pipe and be communicated with described two hydraulic cylinders, described synchronous valve is located at described clamping oil pipe and is unclamped on the pipeline of oil pipe.

2. a kind of hydraulic horizontal-pushing fixture according to claim 1, is characterized in that, also comprise high pressure accumulator, described high pressure accumulator is located on the pipeline of described clamping oil pipe.

3. a kind of hydraulic horizontal-pushing fixture according to claim 1 and 2, is characterized in that, has correction bridge road in described synchronous valve.

4. a kind of hydraulic horizontal-pushing fixture according to claim 3, it is characterized in that, the inwall of described inner sleeve is provided with three annular grooves, in these three annular grooves, is respectively equipped with O-ring seal, wear ring and dust ring, between the flange end of described inner sleeve and described hydraulic cylinder, is provided with O-ring seal.

5. a kind of hydraulic horizontal-pushing fixture according to claim 4, is characterized in that, between described piston and described hydraulic cylinder, is provided with O-ring seal.