CN214408407U - Tensile anchor clamps suitable for nonstandard slice tensile piece - Google Patents

Abstract

The utility model relates to a locking mechanism for tensile test, in particular to a tensile fixture suitable for a nonstandard sheet tensile member, which solves the technical problems in the background technology and comprises a fixture base and a fixture top seat; the clamp base is provided with a strip-shaped hole, and two lower-layer clamping fixture blocks are assembled in the strip-shaped hole in a sliding mode; the clamp top seat is provided with a rectangular closed groove, and the rectangular closed groove is slidably assembled with two upper clamping fixture blocks; during assembly, the end part of the nonstandard sheet-shaped stretching piece penetrates through the strip-shaped hole upwards and then is inserted into the slot, the two lower-layer clamping fixture blocks move relatively to keep clamping on the round corner part of the nonstandard sheet-shaped stretching piece, and the two upper-layer clamping fixture blocks move relatively to keep clamping on two side faces of the nonstandard sheet-shaped stretching piece. The clamping device can realize clamping of non-standard sheet-shaped tensile pieces with different sizes and thicknesses, guarantees clamping force, prevents slipping during tensile test, can reduce the working strength of tensile testers through tensile clamps, and improves the test efficiency.

Description

Tensile anchor clamps suitable for nonstandard slice tensile piece

Technical Field

The utility model relates to a locking mechanism for tensile test specifically is a tensile anchor clamps suitable for nonstandard slice tensile member.

Background

There is a non-standard shape drawing piece, as shown in fig. 1, which is a sheet-like structure, and the whole sheet-like drawing piece is in a capital "I" shape, and the connecting corners of the two end parts and the middle part of the sheet-like drawing piece are rounded. The existing traditional stretching clamps are difficult to match with the stretching piece with the non-standard shape, so that the design of the stretching clamp suitable for the non-standard sheet-shaped stretching piece is imperative.

Disclosure of Invention

The utility model discloses aim at solving and lack one kind with the technical problem of the tensile anchor clamps of current non-standard slice tensile member assorted, provide a tensile anchor clamps suitable for non-standard slice tensile member.

The utility model provides a technical means that its technical problem adopted is: a stretching clamp suitable for a nonstandard sheet stretching piece comprises a clamp base and a clamp top seat, wherein the clamp base is fixedly connected with the clamp top seat; the middle of the clamp base is provided with a strip-shaped hole with the axis along the vertical direction, the length direction of the strip-shaped hole is consistent with the left and right directions of the clamp base, two lower-layer clamping fixture blocks are assembled in the strip-shaped hole in a sliding mode, the lower-layer clamping fixture blocks are connected with first lead screws, and the first lead screws are in threaded fit with the side wall of the clamp base to enable the lower-layer clamping fixture blocks to be capable of displacing along the length direction of the strip-shaped hole; the clamping surfaces of the two lower-layer clamping fixture blocks are curved surfaces matched with the radian of the round corner part of the nonstandard sheet-shaped stretching piece, and when the two lower-layer clamping fixture blocks are respectively positioned at the left end and the right end of the strip-shaped hole, the distance between the two lower-layer clamping fixture blocks is larger than the width of the end part of the nonstandard sheet-shaped stretching piece; a rectangular closed groove is formed in the middle of the bottom of the fixture top seat, the length direction of the rectangular closed groove is consistent with the front and back direction of the fixture top seat, two upper-layer clamping fixture blocks are assembled in the rectangular closed groove in a sliding mode, the upper-layer clamping fixture blocks are connected with second lead screws, the second lead screws are in threaded fit with the side walls of the fixture top seat, the upper-layer clamping fixture blocks can move along the length direction of the rectangular closed groove, and the clamping surfaces of the two upper-layer clamping fixture blocks are vertical planes; the middle of the bottom of the clamp top seat is also provided with a slot for accommodating the end part of the nonstandard sheet-shaped stretching piece along the left and right directions, and the axes of the slot, the rectangular closed slot and the strip-shaped hole are positioned on the same straight line; during the assembly, the tip of non-standard slice tensile piece passes the bar hole back and inserts the slot up, and two lower floor's centre gripping fixture block relative motion keep the clamping effect to the fillet part of non-standard slice tensile piece, and two upper strata centre gripping fixture block relative motion keep the clamping effect with two sides of non-standard slice tensile piece.

In the fixture base, the strip-shaped hole is used as a slide way of the lower-layer clamping fixture block, the lower-layer clamping fixture block is matched with the width of the strip-shaped hole, the two lower-layer clamping fixture blocks are in threaded fit with the side wall of the fixture base through the first lead screw so as to move back and forth left and right in the strip-shaped hole, the clamping effect is realized, the clamping surfaces of the two lower-layer clamping fixture blocks are arc-shaped, the corner parts of the non-standard sheet-shaped stretching part can be perfectly attached, and the clamping effect is ensured; in the anchor clamps footstock, the slide of upper centre gripping fixture block is regarded as to the rectangle enclosed slot, and the width adaptation of upper centre gripping fixture block and rectangle enclosed slot, thereby two upper strata centre gripping fixture blocks pass through the lateral wall screw-thread fit of second lead screw and anchor clamps footstock can be round trip movement around in the rectangle enclosed slot, realize the clamping action, because the both sides face of non-standard slice tensile piece is the plane, so the clamping face of upper centre gripping fixture block sets up to vertical plane, guarantee the centre gripping effect, two lower floor's centre gripping fixture block are to the effort of non-standard slice tensile piece and two upper centre gripping fixture blocks to the effort mutually perpendicular of non-standard slice tensile piece, and lower floor's centre gripping fixture block card is to the turning of non-standard slice tensile piece, can prevent like this that non-standard slice tensile piece from sliding in tensile process. The distance between two lower floor's centre gripping fixture blocks can be adjusted through first lead screw, and the distance between two upper strata centre gripping fixture blocks also can be adjusted through the second lead screw to satisfy the nonstandard slice tensile piece of different size, different thickness, application scope is great.

When the device works, the two lower-layer clamping fixture blocks are adjusted to the left side and the right side of the strip-shaped hole through the first lead screw, one end of the nonstandard sheet-shaped stretching piece faces upwards, the other end of the nonstandard sheet-shaped stretching piece faces downwards, the plane of the nonstandard sheet-shaped stretching piece is parallel to the straight line of the first screw rod, the plane of the nonstandard sheet-shaped stretching piece is vertical to the straight line of the second screw rod, the nonstandard sheet-shaped stretching piece extends into the strip-shaped hole from the bottom of the clamp base, penetrates through the strip-shaped hole and is inserted into the slot, the two upper clamping fixture blocks clamp two side surfaces of the nonstandard sheet-shaped stretching piece by rotating the first screw rod, and then, rotating the second screw rod to enable the two lower-layer clamping fixture blocks to clamp the round corner parts on the two sides of the non-standard sheet-shaped stretching piece, and finishing clamping the upper end of the non-standard sheet-shaped stretching piece through the stretching fixture, wherein the clamping process of the lower end of the non-standard sheet-shaped stretching piece is the same as that of the upper end of the non-standard sheet-shaped stretching piece.

Preferably, threaded holes are formed in the side walls of the clamp base, which are positioned on the left side and the right side of the strip-shaped hole, and the first lead screw is in threaded fit with the side wall of the clamp base through the threaded hole adjacent to the first lead screw; threaded holes are formed in the side walls of the clamp top seat, located on the front side and the rear side of the rectangular closed groove, and the second lead screw is in threaded fit with the side wall of the clamp top seat through the threaded holes adjacent to the second lead screw. The two first lead screws are perpendicular to the left side wall and the right side wall of the clamp base, and the left and right movement of the lower clamping fixture block is realized through the matching of the threaded holes and the first lead screws; the two second lead screws are perpendicular to the front side wall and the rear side wall of the clamp top seat, and the front and the rear of the upper clamping fixture block are moved back and forth through the matching of the threaded holes and the second lead screws.

Preferably, the inner wall of the strip-shaped hole is provided with a first limiting groove distributed along the length direction of the strip-shaped hole, a lug in limiting fit with the first limiting groove extends on the lower-layer clamping fixture block, and the first limiting groove and the lug of the lower-layer clamping fixture block are in limiting fit to enable the lower-layer clamping fixture block to move linearly; the inner wall of the rectangular closed groove is provided with a second limiting groove distributed along the length direction of the rectangular closed groove, a lug in limiting fit with the second limiting groove extends from the upper clamping fixture block, and the upper clamping fixture block moves linearly due to the limiting fit of the second limiting groove and the lug of the upper clamping fixture block. Further guarantee that lower floor's centre gripping fixture block can not rock from top to bottom through first spacing groove and lug, further guarantee that upper centre gripping fixture block does not rock from top to bottom through second spacing groove and lug.

Preferably, the clamping surfaces of the upper clamping fixture block and the lower clamping fixture block are provided with anti-skid layers or anti-skid patterns. The clamping fixture block is used for enhancing the clamping effect of the upper clamping fixture block and the lower clamping fixture block on the nonstandard sheet-shaped stretching piece and preventing the non-standard sheet-shaped stretching piece from slipping.

Preferably, the clamp base and the clamp footstock are in contact, and the two in contact are provided with sinking positioning steps which enable the clamp base and the clamp footstock to be buckled with each other on the surface. This is for ease of positioning during installation.

Preferably, the position of the upper surface of the clamp base, which is in contact with the clamp top seat, is provided with four threaded blind holes, the clamp top seat is provided with four threaded through holes corresponding to the threaded blind holes, and each pair of threaded through hole and each pair of threaded blind hole are connected with a fastening bolt. The fixture base and the fixture top seat are fixedly connected through the fastening bolts, and the fixture top seat is very convenient to mount and dismount.

Preferably, the top of the clamp top seat is fixedly connected with a threaded rod used for connecting a universal test bed along the vertical direction. The stretching clamp can be tightly connected with the universal test bed and is convenient to detach.

Preferably, the lower clamping fixture block is rotatably connected with the first lead screw through a bearing, and the upper clamping fixture block is rotatably connected with the second lead screw through a bearing. Set up the bearing between first lead screw and the centre gripping fixture block of lower floor and guarantee that first lead screw rotates the in-process, lower floor's centre gripping fixture block does not take place to rotate, and in the same way, set up the bearing between second lead screw and the upper strata centre gripping fixture block and guarantee that second lead screw rotates the in-process, and upper strata centre gripping fixture block does not take place to rotate.

Preferably, the outer end parts of the first lead screw and the second lead screw are both provided with anti-skidding handles. Therefore, the first lead screw and the second lead screw can be rotated more easily, and the operation is convenient.

Preferably, the rounded corner of the non-standard sheet-form tension member is maintained in alignment with the lower clip tab when the end of the non-standard sheet-form tension member abuts the bottom of the slot. The installation of the tensile member is very convenient, the non-standard sheet-shaped tensile member is ensured to be quickly in place during installation through the depth of the bottom of the slot, and the corresponding position of the non-standard sheet-shaped tensile member can be quickly aligned with the upper clamping fixture block and the lower clamping fixture block.

The utility model has the advantages that: simple structure, convenient operation and quick, the processing production of being convenient for can realize the centre gripping to the nonstandard slice tensile member of the different thickness of equidimension not through the distance between adjustment upper centre gripping fixture block and the lower floor's centre gripping fixture block, and the centre gripping is effectual moreover, has guaranteed the centre gripping dynamics, when tensile test, can effectively prevent the slippage, passes through moreover tensile clamp can reduce tensile test staff's working strength, improves test efficiency.

Drawings

Fig. 1 is a schematic structural view of a non-standard sheet-like stretching member according to the background of the present invention.

Fig. 2 is a schematic diagram of the overall structure of the stretching clamp suitable for the nonstandard sheet-like stretching member according to the present invention.

Fig. 3 is an exploded schematic view of a stretching clamp suitable for a non-standard sheet-like stretching member according to the present invention.

Fig. 4 is a schematic structural view of the clamp base according to the present invention.

Fig. 5 is a front view of fig. 4.

Fig. 6 is a schematic structural view of the top seat of the clamp according to the present invention.

Fig. 7 is a bottom view of fig. 6.

Fig. 8 is a schematic structural view of the upper clamping block of the present invention.

Fig. 9 is a schematic structural view of the lower clamping block of the present invention.

Fig. 10 is a schematic structural diagram of the first lead screw and the second lead screw in the present invention.

In the figure: 1-a clamp base; 2-a clamp top seat; 3-strip-shaped holes; 4-clamping the fixture block at the lower layer; 5-curved surface; 6-rectangular closed slot; 7-clamping the fixture block on the upper layer; 8-a second lead screw; 9-vertical plane; 10-slot; 11-a threaded hole; 12-sinking to position the step; 13-threaded blind holes; 14-a fastening bolt; 15-threaded rod; 16-a slip-resistant handle; 17-a first lead screw; 18-threaded through hole.

Detailed Description

Referring to fig. 1 to 10, the overall structure of the stretching jig suitable for the non-standard sheet-like stretching member according to the present invention will be described in detail.

A stretching clamp suitable for a non-standard sheet stretching piece is shown in figure 1 and comprises a clamp base 1 and a clamp top seat 2, wherein the clamp base 1 is fixedly connected with the clamp top seat; the exploded schematic view of the tensile fixture is shown in fig. 2, a strip-shaped hole 3 with an axis along the vertical direction is formed in the middle of a fixture base 1, as shown in fig. 4 and 5, the length direction of the strip-shaped hole 3 is consistent with the left-right direction of the fixture base 1, two lower-layer clamping fixture blocks 4 are assembled in the strip-shaped hole 3 in a sliding mode, as shown in fig. 3, the lower-layer clamping fixture blocks 4 are connected with first lead screws 17, the first lead screws 17 are shown in fig. 10, and the first lead screws 17 are in threaded fit with the side wall of the fixture base 1 to enable the lower-layer clamping fixture blocks 4 to be capable of displacing along the length direction of the strip-shaped hole 3; the clamping surfaces of the two lower clamping fixture blocks 4 are both curved surfaces 5 matched with the radian of the round corner part of the nonstandard sheet-shaped stretching piece, as shown in fig. 9, when the two lower clamping fixture blocks 4 are respectively positioned at the left end and the right end of the strip-shaped hole 3, the distance between the two lower clamping fixture blocks 4 is greater than the width of the end part of the nonstandard sheet-shaped stretching piece; as shown in fig. 6 and 7, a rectangular closed groove 6 is formed in the middle of the bottom of the fixture top seat 2, the length direction of the rectangular closed groove 6 is consistent with the front-back direction of the fixture top seat 2, two upper clamping fixture blocks 7 are slidably assembled in the rectangular closed groove 6, the upper clamping fixture blocks 7 are both connected with second lead screws 8, the second lead screws 8 are shown in fig. 10, the second lead screws 8 are in threaded fit with the side walls of the fixture top seat 2, so that the upper clamping fixture blocks 7 can move along the length direction of the rectangular closed groove 6, and the clamping surfaces of the two upper clamping fixture blocks 7 are vertical planes 9 as shown in fig. 8; the middle of the bottom of the clamp top seat 2 is also provided with a slot 10 for accommodating the end part of the nonstandard sheet-shaped stretching piece along the left and right directions, and the axis of the slot 10, the rectangular closed slot 6 and the strip-shaped hole 3 are positioned on the same straight line; during assembly, the end part of the nonstandard sheet-shaped stretching piece penetrates through the strip-shaped hole 3 upwards and then is inserted into the slot 10, the two lower clamping fixture blocks 4 move relatively to keep clamping on the round corner part of the nonstandard sheet-shaped stretching piece, and the two upper clamping fixture blocks 7 move relatively to keep clamping on the two side surfaces of the nonstandard sheet-shaped stretching piece.

In the fixture base 1, the strip-shaped hole 3 is used as a slideway of a lower clamping fixture block 4, the lower clamping fixture block 4 is matched with the strip-shaped hole 3 in width, the two lower clamping fixture blocks 4 are in threaded fit with the side wall of the fixture base 1 through a first lead screw 17 so as to move back and forth left and right in the strip-shaped hole 3, so that clamping effect is realized, and the clamping surfaces of the two lower clamping fixture blocks 4 are arc-shaped, so that the perfect fit of the round corners of a non-standard sheet-shaped tensile member can be realized, and the clamping effect is ensured; in the anchor clamps footstock 2, rectangle closed slot 6 is as the slide of upper centre gripping fixture block 7, and the width adaptation of upper centre gripping fixture block 7 and rectangle closed slot 6, thereby two upper centre gripping fixture blocks 7 can be through the back and forth round trip movement in rectangle closed slot 6 of second lead screw 8 with the lateral wall screw-thread fit of anchor clamps footstock 2, realize the clamping action, because the both sides face of non-standard slice tensile piece is the plane, so the clamping face of upper centre gripping fixture block 7 sets up to vertical plane 9, guarantee the centre gripping effect, the effort of two lower floor's centre gripping fixture blocks 4 to non-standard slice tensile piece and the effort mutually perpendicular of two upper centre gripping fixture blocks 7 to non-standard slice tensile piece, and lower floor's centre gripping fixture block 4 card is to the turning of non-standard slice tensile piece, can prevent like this that non-standard slice tensile piece from sliding in tensile process. The distance between two lower floor's centre gripping fixture blocks 4 can be adjusted through first lead screw 17, and the distance between two upper strata centre gripping fixture blocks 7 also can be adjusted through second lead screw 8 to satisfy the nonstandard slice tensile member of different size, different thickness, application scope is great.

When the device works, the two lower-layer clamping fixture blocks 4 are adjusted to the left side and the right side of the strip-shaped hole 3 through the first screw rod 17, one end of the nonstandard sheet-shaped stretching piece faces upwards, the other end of the nonstandard sheet-shaped stretching piece faces downwards, the plane of the nonstandard sheet-shaped stretching piece is parallel to the straight line of the first screw rod 17, the plane of the nonstandard sheet-shaped stretching piece is vertical to the straight line of the second screw rod 8, the nonstandard sheet-shaped stretching piece extends into the strip-shaped hole 3 from the bottom of the clamp base 1, penetrates through the strip-shaped hole 3 and is inserted into the slot 10, the two upper clamping fixture blocks 7 clamp two side surfaces of the nonstandard sheet-shaped stretching piece by rotating the first screw rod 17, and then the second screw 8 is rotated to enable the two lower clamping fixture blocks 4 to clamp the round corners at two sides of the nonstandard sheet-shaped stretching piece, at the moment, the clamping of the upper end of the nonstandard sheet-shaped stretching piece is finished through the stretching fixture, and the clamping process of the lower end of the nonstandard sheet-shaped stretching piece is the same as that of the lower end of the nonstandard sheet-shaped stretching piece.

Further, as a specific embodiment of the stretching clamp suitable for the nonstandard sheet-shaped stretching member of the present invention, as shown in fig. 3, 4, 5, 6, and 7, the side walls of the clamp base 1 located at the left and right sides of the bar-shaped hole 3 are all provided with threaded holes 11, and the first lead screw 17 is in threaded fit with the side wall of the clamp base 1 through the threaded hole 11 adjacent thereto; all open threaded hole 11 on the lateral wall of the both sides around being located rectangle closed slot 6 of anchor clamps footstock 2, second lead screw 8 all through the threaded hole 11 rather than adjacent with the lateral wall screw-thread fit of anchor clamps footstock 2. The two first lead screws 17 are perpendicular to the left side wall and the right side wall of the clamp base 1, and the left and right movement of the lower clamping fixture block 4 is realized through the matching of the threaded holes 11 and the first lead screws 17; two second lead screws 8 are perpendicular to the front and rear side walls of the fixture top seat 2, and the upper clamping fixture block 7 moves back and forth through the matching of the threaded holes 11 and the second lead screws 8.

Further, as a specific embodiment of the stretching clamp suitable for the nonstandard sheet-shaped stretching member according to the present invention, the inner wall of the strip-shaped hole 3 is provided with a first limiting groove distributed along the length direction of the strip-shaped hole 3, a bump in limiting fit with the first limiting groove extends on the lower clamping fixture block 4, and the first limiting groove and the bump of the lower clamping fixture block 4 in limiting fit enable the lower clamping fixture block 4 to move along a straight line; the inner wall of the rectangular closed groove 6 is provided with a second limiting groove distributed along the length direction of the rectangular closed groove 6, a lug in limiting fit with the second limiting groove extends from the upper clamping fixture block 7, and the lug of the upper clamping fixture block 7 is in limiting fit with the second limiting groove to enable the upper clamping fixture block 7 to move along a straight line. Further guarantee that lower floor's centre gripping fixture block 4 can not rock from top to bottom through first spacing groove and lug, further guarantee that upper centre gripping fixture block 7 does not rock from top to bottom through second spacing groove and lug.

Further, as a concrete implementation of a tensile anchor clamps suitable for nonstandard slice tensile piece, all be provided with skid resistant course or anti-skidding decorative pattern on the clamping face of upper centre gripping fixture block 7 and lower floor's centre gripping fixture block 4. This is to enhance the clamping effect of the upper clamping fixture block 7 and the lower clamping fixture block 4 on the non-standard sheet-like stretching member, and prevent the non-standard sheet-like stretching member from slipping.

Further, as a specific implementation of tensile anchor clamps suitable for nonstandard slice tensile piece, as shown in fig. 2, fig. 3, fig. 4 and fig. 6, anchor clamps base 1 and anchor clamps footstock 2 contact, and the two contacts all be provided with on the surface and make anchor clamps base 1 and anchor clamps footstock 2 mutual buckle sink location step 12. This is for ease of positioning during installation.

Further, as a specific implementation of tensile anchor clamps suitable for nonstandard slice tensile piece, as shown in fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, the position department that contacts with anchor clamps footstock 2 of anchor clamps base 1 upper surface is provided with four screw thread blind holes 13, is provided with four screw thread through-holes 18 that correspond with screw thread blind hole 13 position on the anchor clamps footstock 2, all is connected with fastening bolt 14 in every pair of screw thread through-hole 18 and the screw thread blind hole 13. The fixture base 1 and the fixture top base 2 are fixedly connected through the fastening bolts 14, and the installation and the disassembly are very convenient.

Further, as a specific embodiment of the tensile anchor clamps suitable for nonstandard slice tensile member, as shown in fig. 2 and fig. 3, the threaded rod 15 that is used for connecting universal test bench is linked firmly along vertical direction at the top of anchor clamps footstock 2. The clamp can be tightly connected with a universal test bed for stretching by adding the threaded rod 15, and is convenient to disassemble.

Further, as a concrete implementation mode of tensile anchor clamps suitable for nonstandard slice tensile member, lower floor's centre gripping fixture block 4 rotates with first lead screw 17 through the bearing to be connected, upper centre gripping fixture block 7 rotates with second lead screw 8 through the bearing to be connected. Set up the bearing between first lead screw 17 and the centre gripping fixture block 4 of lower floor and guarantee that first lead screw 17 rotates the in-process, lower floor's centre gripping fixture block 4 does not take place to rotate, and in the same way, set up the bearing between second lead screw 8 and the upper strata centre gripping fixture block 7 and guarantee that second lead screw 8 rotates the in-process, and upper strata centre gripping fixture block 7 does not take place to rotate.

Further, as a specific embodiment of the stretching clamp suitable for the nonstandard sheet-shaped stretching member of the present invention, as shown in fig. 10, the outer end portions of the first lead screw 17 and the second lead screw 8 are both provided with an anti-slip handle 16. Therefore, the first lead screw 17 and the second lead screw 8 can be rotated more easily and conveniently.

Further, as a specific embodiment of the tensile anchor clamps suitable for non-standard slice tensile piece, when the tip of non-standard slice tensile piece supported to the tank bottom of slot 10, the fillet portion and the lower floor's centre gripping fixture block 4 of non-standard slice tensile piece kept the alignment. The installation of the tensile piece is very convenient, the non-standard sheet-shaped tensile piece is ensured to be quickly in place during installation through the depth of the bottom of the slot 10, and the corresponding position of the non-standard sheet-shaped tensile piece can be quickly aligned with the upper clamping fixture block 7 and the lower clamping fixture block 4.

The above detailed description is provided for the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims (10)

1. A stretching clamp suitable for a nonstandard sheet stretching piece is characterized by comprising a clamp base (1) and a clamp top seat (2), wherein the clamp base (1) is fixedly connected with the clamp top seat; the middle of the clamp base (1) is provided with a strip-shaped hole (3) with an axis along the vertical direction, the length direction of the strip-shaped hole (3) is consistent with the left and right directions of the clamp base (1), two lower-layer clamping fixture blocks (4) are assembled in the strip-shaped hole (3) in a sliding manner, the lower-layer clamping fixture blocks (4) are connected with first lead screws (17), and the first lead screws (17) are in threaded fit with the side wall of the clamp base (1) to enable the lower-layer clamping fixture blocks (4) to be capable of displacing along the length direction of the strip-shaped hole (3); the clamping surfaces of the two lower-layer clamping fixture blocks (4) are both curved surfaces (5) matched with the radian of the fillet part of the nonstandard sheet-shaped stretching piece, and when the two lower-layer clamping fixture blocks (4) are respectively positioned at the left end and the right end of the strip-shaped hole (3), the distance between the two lower-layer clamping fixture blocks (4) is greater than the width of the end part of the nonstandard sheet-shaped stretching piece; a rectangular closed groove (6) is formed in the middle of the bottom of the fixture top seat (2), the length direction of the rectangular closed groove (6) is consistent with the front and back direction of the fixture top seat (2), two upper-layer clamping fixture blocks (7) are assembled in the rectangular closed groove (6) in a sliding mode, the upper-layer clamping fixture blocks (7) are connected with second lead screws (8), the second lead screws (8) are in threaded fit with the side wall of the fixture top seat (2) to enable the upper-layer clamping fixture blocks (7) to be capable of moving along the length direction of the rectangular closed groove (6), and the clamping surfaces of the two upper-layer clamping fixture blocks (7) are vertical planes (9); the middle of the bottom of the clamp top seat (2) is also provided with a slot (10) for accommodating the end part of the nonstandard sheet-shaped stretching piece along the left and right directions, and the axes of the slot (10), the rectangular closed slot (6) and the strip-shaped hole (3) are positioned on the same straight line; during assembly, the end part of the nonstandard sheet-shaped stretching piece penetrates through the strip-shaped hole (3) upwards and then is inserted into the slot (10), the two lower-layer clamping fixture blocks (4) move relatively to keep clamping on the round corner part of the nonstandard sheet-shaped stretching piece, and the two upper-layer clamping fixture blocks (7) move relatively to keep clamping on the two side surfaces of the nonstandard sheet-shaped stretching piece.

2. The stretching clamp suitable for the nonstandard sheet-shaped stretching piece according to claim 1, wherein the side walls of the clamp base (1) at the left and right sides of the strip-shaped hole (3) are provided with threaded holes (11), and the first lead screw (17) is in threaded fit with the side wall of the clamp base (1) through the adjacent threaded hole (11); threaded holes (11) are formed in the side walls, located on the front side and the rear side of the rectangular closed groove (6), of the fixture top seat (2), and the second lead screws (8) are in threaded fit with the side walls of the fixture top seat (2) through the adjacent threaded holes (11).

3. The stretching clamp suitable for the nonstandard sheet-shaped stretching piece according to claim 1 or 2, wherein the inner wall of the strip-shaped hole (3) is provided with first limiting grooves distributed along the length direction of the strip-shaped hole (3), the lower clamping fixture block (4) extends with a bump in limiting fit with the first limiting grooves, and the first limiting grooves and the bump of the lower clamping fixture block (4) in limiting fit enable the lower clamping fixture block (4) to move linearly; the inner wall of the rectangular closed groove (6) is provided with a second limiting groove distributed along the length direction of the rectangular closed groove (6), a lug in limiting fit with the second limiting groove extends from the upper clamping fixture block (7), and the lug of the second limiting groove and the lug of the upper clamping fixture block (7) in limiting fit enables the upper clamping fixture block (7) to move along a straight line.

4. The stretching clamp for the nonstandard sheet-shaped stretching member as claimed in claim 1 or 2, wherein the clamping surfaces of the upper clamping fixture block (7) and the lower clamping fixture block (4) are provided with anti-slip layers or anti-slip patterns.

5. The stretching clamp suitable for the nonstandard sheet stretching member according to claim 1 or 2, characterized in that the clamp base (1) and the clamp top seat (2) are contacted, and the contacted surfaces are provided with sinking positioning steps (12) which enable the clamp base (1) and the clamp top seat (2) to be mutually buckled.

6. The stretching clamp suitable for the nonstandard sheet-shaped stretching member according to claim 1 or 2, wherein four threaded blind holes (13) are arranged at the position of the upper surface of the clamp base (1) contacting with the clamp top seat (2), four threaded through holes (18) corresponding to the threaded blind holes (13) are arranged on the clamp top seat (2), and a fastening bolt (14) is connected in each pair of the threaded through holes (18) and the threaded blind holes (13).

7. A drawing jig suitable for non-standard sheet drawing members as claimed in claim 1 or 2 wherein the top of the jig top base (2) is attached vertically to a threaded rod (15) for connection to a universal test stand.

8. The stretching clamp suitable for the nonstandard sheet-shaped stretching member as claimed in claim 1 or 2, wherein the lower clamping fixture block (4) is rotatably connected with the first lead screw (17) through a bearing, and the upper clamping fixture block (7) is rotatably connected with the second lead screw (8) through a bearing.

9. Drawing clamp suitable for non-standard sheet-like drawing pieces, according to claim 1 or 2, characterized in that the outer ends of the first lead screw (17) and the second lead screw (8) are each provided with an anti-slip handle (16).

10. A drawing clamp for a non-standard sheet-like drawing member according to claim 1 or 2, wherein the rounded corner portion of the non-standard sheet-like drawing member is kept aligned with the lower clamping jaw (4) when the end of the non-standard sheet-like drawing member abuts against the bottom of the slot (10).

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