CN105500235A - Variable-angle oblique impact test clamp for thin-wall pipe fittings - Google Patents

Abstract

The invention discloses a variable-angle oblique impact test clamp for thin-wall pipe fittings. The variable-angle oblique impact test clamp is characterized by comprising a base, a rotatable oblique plate, a limited slip supporting block and a clamping frame, wherein double rows of inverted-T-shaped straight flute rails are arranged on the base, and the limited slip supporting block is arranged on the inverted-T-shaped straight flute rails; the base and the rotatable oblique plate are fixed through a pin roll and form a rotation pair between the rotatable oblique plate and the base; the other free end of the rotatable oblique plate is supported on the limited slip supporting block; a circular through slot is formed in the rotatable oblique plate; the center of the clamping frame is superposed with the center of the circular through slot; the clamping frame is fixed on the rotatable oblique plate; and a first wedge block and a second wedge block are arranged in the clamping frame. The clamp design method disclosed by the invention can realize stable and reliable clamping, in an oblique impact test, of thin-wall pipe fittings with different section shapes, so that section dimension variability and stress angle continuous variability can be realized in the test, and therefore, the problems such as a single test angle of a current test sample, a single section shape of the test pipe fittings, and the like are solved.

Description

The oblique impact apparatus of a kind of thin-wall pipe varied angle

Technical field

The present invention relates to automobile safety test device technique field, specifically the oblique impact apparatus of a kind of thin-wall pipe varied angle.

Background technology

At present, light-wall pipe refers to the pipe fitting that the external diameter of tubing and the ratio of wall thickness are greater than 20, automotive body structure has a lot of parts be all light-wall pipe structure, such as: automobile front longitudinal beam.As everyone knows, in automobile safety accident, most accident is oblique collision, so be very important to the oblique Impact Resisting Capability research of light-wall pipe.In the oblique impact test of light-wall pipe, because light-wall pipe is subject to larger pressure in oblique meeting, so need a kind of fixture to carry out reliable and stable clamping to it.There is more defect in the oblique impact apparatus of light-wall pipe in the past.First, fixture can only complete certain several angle of attack test, can not realize the consecutive variations testing angle; The second, test pipe fitting cross sectional shape is single, and fixture was carry out designing for Circular Thin pipe in the past, and subjects is limited; 3rd, test plumbing dimensions is single, and fixture was just for the light-wall pipe size design determined in the past, can not complete and become caliber test.The above three point defect causes existing jig Design can not meet the diversified requirement of test.

Summary of the invention

According to the technical problem of above-mentioned proposition, and provide a kind of thin-wall pipe varied angle oblique impact apparatus.The present invention mainly considers the demand that the oblique collision of automobile energy-absorbing pipe fitting is tested, at the sliding back-up block of two inverted T-shaped straight trough track installation packaged type limits of clamp base, by limitting the mobile realization of sliding back-up block can revolve swash plate angle change, thus meet pipe fitting test pipe fitting by the change demand of angle of attack; By two voussoir length and width sizes difference change combination orthogonal in gripper frame, realize test pipe fitting cross sectional shape, variable dimension, thus the oblique impact test of thin-wall pipe under being applicable to various operating mode, especially can improve the order of accuarcy of the oblique Study on Crashworthiness of automobile.

The technological means that the present invention adopts is as follows:

The oblique impact apparatus of a kind of thin-wall pipe varied angle, is characterized in that: described test fixture comprises base, can revolve swash plate, limits sliding back-up block and gripper frame;

Described base is provided with installs the identical biserial inverted T-shaped straight trough track of screwed hole centre-to-centre spacing with testing on universal testing machine used, and the sliding back-up block of described limit is assembled on described inverted T-shaped straight trough track by the screwed hole that bottom surface is arranged;

Described base and the described swash plate that revolves are respectively arranged with measure-alike cylinder at the contravention that connects, and run through two parts cylinder to be assembled on described base and can to revolve the revolute pair between swash plate and described base described in being formed by the described swash plate that revolves by bearing pin; Described another free end revolving swash plate is supported on the sliding back-up block of described limit, the sliding back-up block of described limit and describedly revolve one end that swash plate supports and be provided with arc transition portion;

The described swash plate that revolves is provided with circular groove, can revolve on the symmetry axis of swash plate width, revolve swash plate and described base stiff end 1/2nd place apart from described described in described circular groove is positioned at; Described gripper frame center and described circular groove center superposition, described gripper frame is that internal and external frames cross section is foursquare framework, the outer frame length of described gripper frame equals the diameter of described circular groove, and the corner of described gripper frame is fixed on described can revolving on swash plate by bolt and the installing hole being arranged on described circular groove periphery; Be provided with in described gripper frame for clamp tested pipe fitting and interference fit to the first voussoir in described gripper frame and the second voussoir.

Further, the screwed hole of the sliding back-up block bottom surface of described limit is by coordinating with the hexagon socket head cap screw running through described inverted T-shaped straight trough track, sliding for described limit back-up block is fixed on the correspondence position of described base, the head of described hexagon socket head cap screw sinks to the shoulder place of described inverted T-shaped straight trough track, without protruding between the sliding back-up block of described limit and the lower surface of described base.

During test, from up to down base need be fixedly mounted on the installing hole that universal testing machine carries by biserial T-shaped straight trough track with common standard bolt.Require to calculate limit sliding back-up block installation site parameter according to oblique angle of attack, then hexagon socket head cap screw is run through inverted T-shaped straight trough track respectively by base lower surface, and then by screwed hole corresponding with inverted T-shaped straight trough track on the sliding back-up block of limit, thus sliding for limit back-up block is fixed on base correspondence position, ensure that the head of hexagon socket head cap screw sinks to the shoulder place of inverted T-slot simultaneously, guarantee that the lower surface of base is without projection.

Further, described to revolve the angle that the revolute pair between swash plate and described base formed be Δ θ, and its continuous variable of Δ θ meets:

θ＝Δθ，

Wherein: the angle of attack of θ required by impact test, 0 ° ~ 30 ° are got.

Further, realize the support of differing tilt angles swash plate by changing the sliding installation site of back-up block on inverted T-shaped straight trough track of limit, thus realize the continuous variable of angle of attack.Pass between the installation site of the sliding back-up block of described limit and angle of attack θ is:

$b_1=\frac{h_1-h_2}{\tan \mathrm{\θ}},$

Wherein: b ₁for the sliding back-up block of described limit is to the minimum distance of revolute pair, h ₁be limited the height of sliding back-up block, h ₂for the diameter (as shown in Figure 10) of revolute pair cylinder.

Further, it is concentric with described circular groove that described installing hole is evenly arranged on described circular groove periphery, and described gripper frame coordinates by the installation and described voussoir with described installing hole the clamping realized different size pipe fitting.

In practical operation, installing hole be evenly distributed on described circular groove circumferencial direction, totally 8 screwed holes, these screwed holes are the bolt mounting holes corresponding with gripper frame.

Further, when described pipe fitting is square tube, the frame of described gripper frame is arranged at the described sides aligned parallel that can revolve swash plate, is fixed by 4 installing holes of correspondence, and described square tube and described first voussoir, the second voussoir elastic conjunction are in described gripper frame, satisfied:

a ₁＝L-d ₁，

Wherein, L is the described gripper frame inside casing length of side, a ₁be the width of the first voussoir and the second voussoir, d ₁for being clamped the length of side of square tube.

Further, when described pipe fitting is pipe, the method of clamping of described gripper frame rotates 45 ° on the basis of described square tube, described gripper frame and the described swash plate that revolves are fixedly installed togather by other 4 installing holes, clamped by two limits of gripper frame when can ensure pipe pressurized like this, thus more stable.By pipe and the first voussoir, the second voussoir elastic conjunction in described gripper frame, meet:

a ₂＝L-d ₂，

Wherein, a ₂be the width of the first voussoir and the second voussoir, d ₂for by held circular pipe outside diameter.

Further, when described pipe fitting is regular hexagon pipe, the frame of described gripper frame is arranged and the described sides aligned parallel revolving swash plate, is fixed by 4 installing holes of correspondence, by described regular hexagon pipe and described first voussoir, the second voussoir elastic conjunction in described gripper frame, meet:

a ₃＝L-2d ₃，

${a_3}^{\′}=L-\sqrt{3}{d}_3,$

Wherein, a ₃be the width of the first voussoir, a ₃' be the width of the second voussoir, d ₃for the regular hexagon length of side.

Further, when described pipe fitting is elliptical cross section facial canal, the frame of described gripper frame is arranged and the described sides aligned parallel revolving swash plate, is fixed by 4 installing holes of correspondence, by described elliptical cross section facial canal and described first voussoir, the second voussoir elastic conjunction in described gripper frame, meet:

a ₄＝L-d ₄，

a ₄'＝L-d ₄'，

Wherein, a ₄be the width of the first voussoir, a ₄' be the width of the second voussoir, d ₄, d ₄' be respectively major axis and the minor axis length of elliptical tube.

About the base that the present invention relates to, bearing pin, the sliding back-up block of limit, can revolve swash plate, gripper frame specific design as follows:

1) base designs

Base is a rectangle steel plate having two inverted T-shaped straight trough track, and is welded with two cylindrical sections in its one end, for assembling with swash plate and bearing pin.Critical size in base designs is the dimensional parameters of T-slot and the dimensional parameters of cylinder.

Each critical size parameter is determined by following principle: (a) L value should be less than test universal testing machine mounting platform width used; B the value of () d should be equal with the centre-to-centre spacing of test press used being installed screwed hole; C the land widths of () T-slot and the value of well width should install the bolt head diameter of bolt used slightly larger than testing press respectively, screw diameter is equal; D the height of shoulder value of () T-slot should be not less than the height of selected hexagon socket head cap screw head.

2) bearing pin design

The relative dimensions of bearing pin is determined by following principle: the value of (a) bearing pin length is equal with the width of base in base designs; B the value of () bearing pin cross section radius of circle R should meet the following conditions,

$\frac{F}{2{\mathrm{\πR}}^2}\≤\[\mathrm{\τ}\],$

Wherein, F is maximum shear stress suffered by bearing pin, the shear strength that [τ] is selected materials.

3) back-up block design

The critical size of back-up block is determined by following principle: the value of (a) back-up block width is equal with the width of base in base designs; B () back-up block bottom thread hole centre-to-centre spacing should be equal with size in base designs; The height h of (c) back-up block ₁value should meet the following conditions,

$h_1\≥\frac{l{\mathrm{tan\θ}}_{max}}{4},$

Wherein, l is the length of base, θ _maxfor testing required maximum tilt angle.

4) swash plate design can be revolved

The critical size that can revolve swash plate designs by following principle: (a) can revolve the value of swash plate width should be equal with the width of base in base designs; B () can revolve the thickness h of swash plate ₃should meet the following conditions,

$w_b=\frac{F_v*l^3}{3EI}\≤1mm,I=\frac{{{\mathrm{bh}}_3}^3}{12};$

Wherein, w _bfor the deformation deflection at pressure spot place, F _vfor revolving the pressure perpendicular to direction, plate face suffered by swash plate, l can to revolve on swash plate stress point to the distance of back-up block fulcrum, the elastic modelling quantity of E selected materials, and I is the moment of inertia of square-section, and b is the width that can revolve swash plate; C diameter that () can revolve circular trough on swash plate should equal the maximal side testing square tube doubly, circular groove degree of depth h ₄should meet d home position that () can revolve circular trough on swash plate should be in the half place can revolving swash plate length; Can revolve 8 screwed holes on swash plate should be uniformly distributed around the circumferencial direction of circular groove, its pitch circle diameter is about 1.15 times of circular groove diameter.

5) gripper frame design

The critical size of gripper frame should design by following principle: the value of (a) square inner frame length of side should equal the maximum caliber testing pipe fitting; (b) gripper frame height h ₅value should meet the following conditions,

h ₅+h ₄＝0.2H；

Wherein, h ₄for revolving the degree of depth of circular groove on swash plate, H is the length of test pipe fitting; C () gripper frame four through holes are circularly and evenly distributed, lay respectively at four drift angle places of gripper frame, its pitch circle diameter is equal with the pitch circle diameter that can revolve 8 screwed holes on swash plate.

The present invention is ensureing under the clamping reliable and stable to oblique impact test pipe fitting, as follows relative to the advantage of existing fixture:

The first, the angle that can be revolved between swash plate from base by change and limit slide the continuous variable that the different Support Position of back-up block realizes pipe fitting angle of attack; The second, rigging positions different on swash plate can revolved realize the clamping to different cross section shape pipe fitting by changing gripper frame; 3rd, realize clamping the pipe fitting of different cross section size by changing the size being assembled to voussoir size in gripper frame.The present invention substantially increases the range of application of test fixture, meets the more diversified requirement of the oblique impact test of thin-wall pipe.

The present invention extensively can promote in fields such as automobile safety test devices for the foregoing reasons.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

Fig. 1 is structural representation of the present invention.

Fig. 2 is the front view of base of the present invention.

Fig. 3 is the schematic diagram of base of the present invention.

Fig. 4 is the front view revolving swash plate of the present invention.

Fig. 5 is the front view of gripper frame of the present invention.

The clamping schematic diagram that Fig. 6 is tested pipe fitting of the present invention when being square tube.

The clamping schematic diagram that Fig. 7 is tested pipe fitting of the present invention when being pipe.

The clamping schematic diagram that Fig. 8 is tested pipe fitting of the present invention when being regular hexagon pipe.

The clamping schematic diagram that Fig. 9 is tested pipe fitting of the present invention when being elliptical cross section facial canal.

Figure 10 is test principle schematic diagram of the present invention.

In figure: 1, base 11, first inverted T-shaped straight trough track 12, second inverted T-shaped straight trough track 13, first cylinder 14, hexagon socket head cap screw 2, swash plate 21, circular groove 22, installing hole 23, second cylinder 3, the sliding back-up block 31 of limit, arc transition portion 4, bearing pin 5, gripper frame 51, first voussoir 52, second voussoir 53, bolt 6, pipe fitting can be revolved.

Detailed description of the invention

As shown in Figure 1, the oblique impact apparatus of a kind of thin-wall pipe varied angle, described test fixture comprises base 1, can revolve swash plate 2, limits sliding back-up block 3 and gripper frame 5;

Described base 1 is provided with installs the identical biserial inverted T-shaped straight trough track of screwed hole centre-to-centre spacing with testing on universal testing machine used, be respectively the first inverted T-shaped straight trough track 11 and the second inverted T-shaped straight trough track 12, the sliding back-up block 3 of described limit is assembled on described inverted T-shaped straight trough track by the screwed hole that bottom surface is arranged;

As Fig. 2, shown in Fig. 3, the screwed hole of sliding back-up block 3 bottom surface of described limit is by coordinating with the hexagon socket head cap screw 14 running through described inverted T-shaped straight trough track, sliding for described limit back-up block 3 is fixed on the correspondence position of described base 1, the head of described hexagon socket head cap screw 14 sinks to the shoulder place of described inverted T-shaped straight trough track, without protruding between the sliding back-up block 3 of described limit and the lower surface of described base 1.

Described base 1 and the described swash plate 2 that revolves are respectively arranged with measure-alike cylinder at the contravention that connects, and shown base 1 is arranged on two, end the first cylinder 13, the described swash plate 2 that revolves arranges the second cylinder in center, end; Run through two parts cylinder by bearing pin 4 the described swash plate 2 that revolves to be assembled on described base 1 and can to revolve the revolute pair between swash plate 2 and described base 1 described in being formed; Described another free end revolving swash plate 2 is supported on the sliding back-up block 3 of described limit, and the sliding back-up block 3 of described limit revolves one end that swash plate 2 supports be provided with arc transition portion 31 with described;

As shown in Figure 4, the described swash plate 2 that revolves is provided with circular groove 21, can revolve on the symmetry axis of swash plate 2 width described in described circular groove 21 is positioned at, and revolves swash plate 2 and described base 1 stiff end 1/2nd place apart from described; Described gripper frame 5 center and described circular groove 21 center superposition, described gripper frame 5 (as shown in Figure 5) is foursquare framework for internal and external frames cross section, the outer frame length of described gripper frame 5 equals the diameter of described circular groove 21, and the corner of described gripper frame 5 is fixed on by bolt 53 and the installing hole 22 being arranged on described circular groove 21 periphery describedly can revolve on swash plate 2; Be provided with in described gripper frame 5 for clamping tested pipe fitting 6 interference fit to the first voussoir 51 and the second voussoir 52 in described gripper frame 5.

Described to revolve the angle that the revolute pair between swash plate 2 and described base 1 formed be Δ θ, and its continuous variable of Δ θ meets:

θ＝Δθ，

Wherein: the angle of attack of θ required by impact test, 0 ° ~ 30 ° are got.

Pass between the installation site of the sliding back-up block 3 of described limit and angle of attack θ is:

$b_1=\frac{h_1-h_2}{\tan \mathrm{\θ}},$

Wherein: b ₁for the sliding back-up block 3 of described limit is to the minimum distance of revolute pair, h ₁be limited the height of sliding back-up block 3, h ₂for the diameter of revolute pair cylinder.

It is concentric with described circular groove 21 that described installing hole 22 is evenly arranged on described circular groove 21 periphery, and described gripper frame 5 coordinates by the installation and described voussoir with described installing hole 22 the clamping realized different size pipe fitting 6.

As shown in Figure 6, when described pipe fitting 6 is square tube, the frame of described gripper frame 5 is arranged at the described sides aligned parallel that can revolve swash plate 2, is fixed by 4 installing holes 22 of correspondence, described square tube and described first voussoir 51, second voussoir 52 elastic conjunction, in described gripper frame 5, meet:

a ₁＝L-d ₁，

Wherein, L is the described gripper frame 5 inside casing length of side, a ₁be the width of the first voussoir 51 and the second voussoir 52, d ₁for being clamped the length of side of square tube.

As shown in Figure 7, when described pipe fitting 6 is pipe, the method of clamping of described gripper frame 5 rotates 45 ° on the basis of described square tube, described gripper frame 5 is fixedly installed togather by other 4 installing holes 22 with the described swash plate 2 that revolves, by pipe and the first voussoir 51, second voussoir 52 elastic conjunction in described gripper frame, meet:

a ₂＝L-d ₂，

Wherein, a ₂be the width of the first voussoir 51 and the second voussoir 52, d ₂for by held circular pipe outside diameter.

As shown in Figure 8, when described pipe fitting 6 is regular hexagon pipe, the frame of described gripper frame 5 is arranged and the described sides aligned parallel revolving swash plate 2, fixed by 4 installing holes 22 of correspondence, by described regular hexagon pipe and described first voussoir 51, second voussoir 52 elastic conjunction in described gripper frame 5, meet:

a ₃＝L-2d ₃，

${a_3}^{\′}=L-\sqrt{3}{d}_3,$

Wherein, a ₃be the width of the first voussoir 51, a ₃' be the width of the second voussoir 52, d ₃for the regular hexagon length of side.

As shown in Figure 9, when described pipe fitting 6 is elliptical cross section facial canal, the frame of described gripper frame 5 is arranged and the described sides aligned parallel revolving swash plate 2, fixed by 4 installing holes 22 of correspondence, by described elliptical cross section facial canal and described first voussoir 51, second voussoir 52 elastic conjunction in described gripper frame 5, meet:

a ₄＝L-d ₄，

a ₄'＝L-d ₄'，

Wherein, a ₄be the width of the first voussoir 51, a ₄' be the width of the second voussoir 52, d ₄, d ₄' be respectively major axis and the minor axis length of elliptical tube.

Embodiment

The press that the present invention is mated is Instron universal testing machine, the material that fixture is selected is No. 45 steel, according to test demand, this design involved by test pipe fitting 6 be pipe and square tube, pipe full-size is diameter 110mm, square tube full-size is length of side 110mm, and test angle of attack is 0 ° ~ 30 ° continuous variables.Each part concrete relevant parameter design of fixture is as follows:

1) base 1 designs

A () press width dimensions selected by test, the width value 200mm of base 1, entirety is the steel plate of one piece of 400mm*200mm*25mm.

B () is 50mm according to test selected universal testing machine two retaining thread hole centre-to-centre spacing, on base, the centre-to-centre spacing value of two T-slots is 50mm.

C the size of screwed hole installed by () press selected by test, determine that the land widths of the size T-slot of T-slot is 20mm, the well width of T-slot is 12mm.

D () hexagon socket head cap screw 14 size selected by assembling, determines size 13mm in T-slot.

2) bearing pin 4 designs

A according to the value of base 1 width in base 1 design, () can determine that the length value of bearing pin 4 is 200mm.

B () bearing pin 4 cross section radius of circle R, in the design, the selection of material is No. 45 steel, and shear strength allowable [τ] is 178MPa, according to formula ,

$R\≥\sqrt{\frac{F}{2\mathrm{\π}\[\mathrm{\τ}\]}}=\sqrt{\frac{131700}{2\mathrm{\π}*178}}=10.85mm$

Getting safety coefficient in this design is 1.15, so R gets 12.5mm.

3) the sliding back-up block 3 of limit designs

A () can be determined to limit the width value of sliding back-up block 3 to be 200mm according to the value of base 1 width in base 1 design.

B () obtains according to the centre-to-centre spacing of two T-slots on base 1, bottom the sliding back-up block 3 of limit, the centre-to-centre spacing of two screwed holes is 50mm.

(c) limit sliding back-up block 3 height h ₁, according to

$h_1\≥\frac{l{\mathrm{tan\θ}}_{max}}{4}=\frac{400*tan30}{4}=57.7mm$

Conveniently machining is with this design limit sliding back-up block 3 height h ₁get 60mm.

4) swash plate 2 can be revolved to design

A width value that () can determine to revolve swash plate 2 according to the value of base width in base 1 design is 200mm.

B () can revolve the thickness h of swash plate 2 ₃, according to

$w_b=\frac{F_v*l^3}{3EI}\≤1mm,I=\frac{{{\mathrm{bh}}_3}^3}{12};$

Formula Elastic Modulus E value 210GPa, calculates h ₃>=16.24mm, in this design, safety coefficient chooses 1.23, so h3 gets 20mm.

C diameter that () can revolve circular groove 21 on swash plate 2 is test square tube maximal side doubly, 156mm is about; The degree of depth of circular groove 21 meets h in this design ₄get 10mm.

D pitch circle diameter that () can revolve 8 installing holes 22 on swash plate 2 is 1.15 times of circular groove 21 diameter, value 180mm in this design.

5) gripper frame 5 designs

A the length of side of the square inner frame of () gripper frame 5 equals the maximum caliber testing pipe fitting 6, value 110mm in this design.

The height h of (b) gripper frame 5 ₅meet h ₅+ h ₄=0.2H, wherein h ₄be test pipe fitting 6 length for can to revolve circular groove 21 degree of depth on swash plate 2 be 10mm, H, its span 150mm ~ 250mm, so h in this design ₅value 25mm.

C () gripper frame 5 four through holes are circularly and evenly distributed, its pitch circle diameter is equal with the pitch circle diameter that can revolve 8 installing holes 22 on swash plate 2.Pitch circle diameter value 180mm can be obtained by design above.

The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.

Claims (9)

1. the oblique impact apparatus of thin-wall pipe varied angle, is characterized in that: described test fixture comprises base, can revolve swash plate, limits sliding back-up block and gripper frame;

Described base is provided with installs the identical biserial inverted T-shaped straight trough track of screwed hole centre-to-centre spacing with testing on universal testing machine used, and the sliding back-up block of described limit is assembled on described inverted T-shaped straight trough track by the screwed hole that bottom surface is arranged;

Described base and the described swash plate that revolves are respectively arranged with measure-alike cylinder at the contravention that connects, and run through two parts cylinder to be assembled on described base and can to revolve the revolute pair between swash plate and described base described in being formed by the described swash plate that revolves by bearing pin; Described another free end revolving swash plate is supported on the sliding back-up block of described limit, the sliding back-up block of described limit and describedly revolve one end that swash plate supports and be provided with arc transition portion;

The described swash plate that revolves is provided with circular groove, can revolve on the symmetry axis of swash plate width, revolve swash plate and described base stiff end 1/2nd place apart from described described in described circular groove is positioned at; Described gripper frame center and described circular groove center superposition, described gripper frame is that internal and external frames cross section is foursquare framework, the outer frame length of described gripper frame equals the diameter of described circular groove, and the corner of described gripper frame is fixed on described can revolving on swash plate by bolt and the installing hole being arranged on described circular groove periphery; Be provided with in described gripper frame for clamp tested pipe fitting and interference fit to the first voussoir in described gripper frame and the second voussoir.

2. the oblique impact apparatus of thin-wall pipe varied angle according to claim 1, it is characterized in that: the screwed hole of the sliding back-up block bottom surface of described limit is by coordinating with the hexagon socket head cap screw running through described inverted T-shaped straight trough track, sliding for described limit back-up block is fixed on the correspondence position of described base, the head of described hexagon socket head cap screw sinks to the shoulder place of described inverted T-shaped straight trough track, without protruding between the sliding back-up block of described limit and the lower surface of described base.

3. the oblique impact apparatus of thin-wall pipe varied angle according to claim 1, is characterized in that: described to revolve the angle that the revolute pair between swash plate and described base formed be Δ θ, and its continuous variable of Δ θ meets:

θ＝Δθ，

Wherein: the angle of attack of θ required by impact test, 0 ° ~ 30 ° are got.

4. the oblique impact apparatus of thin-wall pipe varied angle according to claim 3, is characterized in that: the pass between the installation site of the sliding back-up block of described limit and angle of attack θ is:

$b_1=\frac{h_1-h_2}{tan\mathrm{\θ}},$

Wherein: b ₁for the sliding back-up block of described limit is to the minimum distance of revolute pair, h ₁be limited the height of sliding back-up block, h ₂for the diameter of revolute pair cylinder.

5. the oblique impact apparatus of thin-wall pipe varied angle according to claim 1, it is characterized in that: it is concentric with described circular groove that described installing hole is evenly arranged on described circular groove periphery, described gripper frame coordinates by the installation and described voussoir with described installing hole the clamping realized different size pipe fitting.

6. the oblique impact apparatus of thin-wall pipe varied angle according to claim 5, it is characterized in that: when described pipe fitting is square tube, the frame of described gripper frame is arranged at the described sides aligned parallel that can revolve swash plate, fixed by 4 installing holes of correspondence, described square tube and described first voussoir, the second voussoir elastic conjunction, in described gripper frame, meet:

a ₁＝L-d ₁，

Wherein, L is the described gripper frame inside casing length of side, a ₁be the width of the first voussoir and the second voussoir, d ₁for being clamped the length of side of square tube.

7. the oblique impact apparatus of thin-wall pipe varied angle according to claim 6, it is characterized in that: when described pipe fitting is pipe, the method of clamping of described gripper frame rotates 45 ° on the basis of described square tube, described gripper frame and the described swash plate that revolves are fixedly installed togather by other 4 installing holes, by pipe and the first voussoir, the second voussoir elastic conjunction in described gripper frame, meet:

a ₂＝L-d ₂，

Wherein, a ₂be the width of the first voussoir and the second voussoir, d ₂for by held circular pipe outside diameter.

8. the oblique impact apparatus of thin-wall pipe varied angle according to claim 5, it is characterized in that: when described pipe fitting is regular hexagon pipe, the frame of described gripper frame is arranged and the described sides aligned parallel revolving swash plate, fixed by 4 installing holes of correspondence, by described regular hexagon pipe and described first voussoir, the second voussoir elastic conjunction in described gripper frame, meet:

a ₃＝L-2d ₃，

${a_3}^{\′}=L-\sqrt{3}{d}_3,$

Wherein, a ₃be the width of the first voussoir, a ₃' be the width of the second voussoir, d ₃for the regular hexagon length of side.

9. the oblique impact apparatus of thin-wall pipe varied angle according to claim 5, it is characterized in that: when described pipe fitting is elliptical cross section facial canal, the frame of described gripper frame is arranged and the described sides aligned parallel revolving swash plate, fixed by 4 installing holes of correspondence, by described elliptical cross section facial canal and described first voussoir, the second voussoir elastic conjunction in described gripper frame, meet:

a ₄＝L-d ₄，

a ₄'＝L-d ₄'，

Wherein, a ₄be the width of the first voussoir, a ₄' be the width of the second voussoir, d ₄, d ₄' be respectively major axis and the minor axis length of elliptical tube.