Clamp for tensile test

Abstract

The utility model relates to a tensile test fixture which comprises a disc seat, arc-shaped vertical plates are vertically fixed on the disc seat, the tops of the two arc-shaped vertical plates are connected with an annular cover plate, a clamping seat with a square through groove in the center is connected between the two arc-shaped vertical plates, and rectangular through grooves are formed in the centers of the four inner walls of the square through groove. Wherein a lower guide through groove is formed in the bottom face of one set of rectangular through grooves, an upper guide through groove is formed in the top face of the other set of rectangular through grooves, a clamping block is arranged in each rectangular through groove, a guide rod is connected to each clamping block, a lower annular plate is arranged between the disc base and the clamping base, and an upper annular plate is arranged between the annular cover plate and the clamping base. The lower annular plate is provided with kidney-shaped through grooves corresponding to the lower guide through grooves, the upper annular plate is provided with kidney-shaped through grooves corresponding to the upper guide through grooves, and a power mechanism is installed on one arc-shaped vertical plate. According to the utility model, self-centering clamping can be conveniently carried out on the sample, the clamping stability is kept, and errors are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to test fixture technical field, concretely relates to a clamp for tensile test. BACKGROUND

[0002] Mechanical property is an important performance index of metal material, wherein the tensile test is the most common and basic means to obtain the mechanical property index. The existing universal tensile test fixture is designed for general test sample, and the part for clamping the sample in the test operation is a smooth plane, which is insufficient to have strong friction to prevent the sample from loosening in the tensile process. If a larger clamping force is used to prevent the sample from falling off in the tensile process, it is difficult to control the force, and the sample end may be deformed, so that the end breaks. Therefore, the existing fixture cannot guarantee firm clamping without damaging the sample. In addition, the existing tensile fixture cannot adapt to the differences in size and position of the sample itself and the differences in installation position during work, so it is easy to cause misalignment of the assembly position, and other interfering forces may occur during tensile test, resulting in large experimental error. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model provides a clamp for tensile test, which can use four clamping blocks to self-center clamping of the sample and improve the stability of clamping, thereby helping to reduce the error.

[0004] The utility model is realized through the following technical schemes:

[0005] A clamp for tensile test is provided, which comprises a disc seat, two arc-shaped vertical plates are vertically fixed on the circumferential edge of the upper surface of the disc seat and are oppositely arranged, a ring-shaped cover plate is connected to the top of the two arc-shaped vertical plates and is concentric with the disc seat, a clamping seat is connected between the two arc-shaped vertical plates and is located above the disc seat and concentric with the disc seat, a square through slot is formed in the center of the clamping seat, four inner walls of the square through slot are each provided with a through rectangular through slot in the vertical inner wall direction, the bottom surface of one set of mutually opposite rectangular through slots is provided with a lower guide through slot that penetrates the bottom surface of the clamping seat along the width center line, the top surface of the other set of mutually opposite rectangular through slots is provided with an upper guide through slot that penetrates the surface of the clamping seat along the width center line, a clamping block is movably arranged in each rectangular through slot, a guide rod that is opposite to the guide through slot is connected to the clamping block, a lower ring-shaped plate is arranged between the disc seat and the clamping seat, an upper ring-shaped plate is arranged between the ring-shaped cover plate and the clamping seat, the lower ring-shaped plate is provided with a waist round through slot that is staggered with the lower guide through slot and is used for accommodating the guide rod, the upper ring-shaped plate is provided with a waist round through slot that is staggered with the upper guide through slot and is used for accommodating the guide rod, and a power mechanism for driving the coaxial rotation of the upper ring-shaped plate and the lower ring-shaped plate is installed on one of the arc-shaped vertical plates.

[0006] Further, the power mechanism comprises a fixing base connected to the outer side of the arc-shaped vertical plate, a sliding groove is formed on the upper surface of the fixing base along the diameter direction of the disc, and a sliding block is slidably connected in the sliding groove, a lead screw is rotatably installed in the sliding groove along the length direction of the sliding groove, and the lead screw penetrates through the sliding block and is threadedly connected with the sliding block; an oscillating rod is arranged on the sliding block, the middle part of the oscillating rod is hinged to the sliding block, the upper end of one end of the oscillating rod is hinged to an upper connecting rod, and the lower end of the other end of the oscillating rod is hinged to a lower connecting rod; the end of the upper connecting rod is hinged to the upper annular plate, and the end of the lower connecting rod is hinged to the lower annular plate.

[0007] When the lead screw rotates, the sliding block can move along the length direction of the lead screw under the limiting action of the sliding groove, and then the oscillating rod on the sliding block can drive the connecting rods at two ends to drive the upper annular plate and the lower annular plate to rotate coaxially, the force of the guide rod is utilized to drive the clamping block to move in the rectangular through groove, and the clamping and loosening of the rectangular sample are realized.

[0008] Further, a speed reducer motor is installed on the fixing base, and the driving shaft of the speed reducer motor is connected with one end of the lead screw through a shaft coupling.

[0009] The speed reducer motor is installed on the fixing base, and the speed reducer motor is connected with one end of the lead screw through the shaft coupling, the lead screw can be driven to rotate in the forward and reverse directions by controlling the forward and reverse rotation of the speed reducer motor, and then the sliding block is driven to move reciprocatingly to control the clamping block to clamp or loosen the sample.

[0010] Further, the disc seat is fixed on the mounting seat, and the mounting seat is provided with a mounting hole for being connected with the testing machine.

[0011] The disc seat is fixed on the mounting seat, and the mounting seat is connected with the testing machine through the mounting hole and bolts, so that the installation, disassembly and maintenance are facilitated.

[0012] Preferably, the clamping surface of the clamping block is provided with a flexible rubber pad.

[0013] The rubber pad is arranged on the clamping surface of the clamping block, the clamping force is effectively buffered, the deformation of the sample caused by clamping is avoided, the friction force between the clamping block and the sample is effectively increased, the stability of clamping is improved, and the smooth performance of the tensile test is ensured.

[0014] The utility model discloses the beneficial effects:

[0015] The utility model discloses a drive slider along the length direction of sliding slot by utilizing screw rod, drive both sides connecting rod with coaxial rotation of upper annular plate and lower annular plate by utilizing swing lever on slider, two connecting rods can rotate in the movement and drive corresponding rotation of upper environmental protection or lower annular plate, when the ring plate rotates, the waist round through slot on it exerts force on the guide through slot in the limiting action of guide rod, and the guide rod drives the clamping block to move along the guide through slot length, can realize that four clamping blocks carry out automatic center clamping to sample, and the clamping block carries out synchronous clamping to four surfaces of sample, improves the stability of clamping, effectively prevents the problem of falling in sample tensile test, and it is helpful to guarantee the stability of tensile test and reduce test error.

[0016] The clamp of the utility model is suitable for rectangular sample, also suitable for sample of other sections, drive swing lever to swing by utilizing screw rod drive slider, and the upper connecting rod and lower connecting rod connected with swing lever drive upper annular plate and lower annular plate to rotate respectively, and then cooperate with the movement of guide rod in guide through slot and waist round through slot and limit, can realize self-centering clamping in clamping process, keep the stability of clamping, and it is helpful to reduce tensile test error. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic diagram of the utility model.

[0018] Figure 2 It is Figure 1 The top view.

[0019] Figure 3 It is the explosion schematic diagram of clamp holder, upper annular plate and lower annular plate of the utility model.

[0020] As shown in the figure:

[0021] 1, mounting seat, 2, mounting hole, 3, disc seat, 4, annular cover plate, 5, waist round through slot, 6, guide rod, 7, clamping block, 8, rectangular sample, 9, upper connecting rod, 10, swing lever, 11, fixed seat, 12, sliding slot, 13, slider, 14, screw rod, 15, lower annular plate, 16, upper annular plate, 17, arc vertical plate, 18, clamp holder, 19, rectangular through slot, 20, lower guide through slot, 21, upper guide through slot, 22, square through slot, 23, lower connecting rod. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of the scheme, the following through specific implementation, the scheme is described.

[0023] A kind of clamp for tensile test, including disc seat 3, disc seat 3 is fixed on mounting seat 1, mounting seat 1 is opened with the mounting hole 2 for being connected with test machine, and the clamp whole is connected with test machine by mounting seat 1 and is installed.

[0024] Two arc-shaped vertical plates 17 are vertically fixed on the circumferential edge of the upper surface of the disc seat 3, the top of the two arc-shaped vertical plates 17 is connected with the annular cover plate 4 which is concentric with the disc seat 3, a clamping seat 18 is connected between the two arc-shaped vertical plates 17, the clamping seat 18 is located above the disc seat 3 and is concentric with the disc seat 3, a square through slot 22 is formed in the center of the clamping seat 18, a through rectangular through slot 19 is formed in the center of the four inner walls of the square through slot 22 along the vertical inner wall direction, the bottom surface of a group of mutually opposite rectangular through slots 19 is provided with a lower guide through slot 20 which penetrates the bottom surface of the clamping seat 18 along the width center line, the top surface of another group of mutually opposite rectangular through slots 19 is provided with an upper guide through slot 21 which penetrates the surface of the clamping seat 18 along the width center line, a clamping block 7 is movably arranged in each rectangular through slot 19, a guide rod 6 which is opposite to the guide through slot is connected to the clamping block 7, a lower annular plate 15 is arranged between the disc seat 3 and the clamping seat 18, an upper annular plate 16 is arranged between the annular cover plate 4 and the clamping seat 18, the lower annular plate 15 is provided with a waist round through slot 5 which is staggered with the lower guide through slot 20 and is used for accommodating the guide rod 6, the upper annular plate 16 is provided with a waist round through slot 5 which is staggered with the upper guide through slot 21 and is used for accommodating the guide rod 6, and a power mechanism is installed on one of the arc-shaped vertical plates 17 and is used for driving the upper annular plate 16 and the lower annular plate 15 to rotate coaxially.

[0025] The power mechanism comprises a fixing seat 11 which is connected to the outer side of the arc-shaped vertical plate 17, a sliding groove 12 is formed in the upper surface of the fixing seat 11 along the diameter direction of the disc seat 3, a sliding block 13 is slidably connected in the sliding groove 12, a lead screw 14 which penetrates the sliding block 13 and is threadedly connected with the sliding block 13 is rotatably installed in the sliding groove 12 along the length direction of the sliding groove 12, a swing rod 10 is arranged on the sliding block 13, the middle part of the swing rod 10 is hinged to the sliding block 13, the upper end of one end of the swing rod 10 is hinged to an upper connecting rod 9, and the lower end of the other end of the swing rod 10 is hinged to a lower connecting rod 23, the end of the upper connecting rod 9 is hinged to the upper annular plate 16, and the end of the lower connecting rod 23 is hinged to the lower annular plate 15.

[0026] In order to improve the convenience of clamping, a speed reducer motor is installed on the fixing seat 1, the driving shaft of the speed reducer motor is connected with one end of the lead screw 14 through a shaft coupling, and the positive and negative rotation of the lead screw 14 can be driven by controlling the positive and negative rotation of the speed reducer motor, so as to realize the clamping action or loosening action of the clamping block 7.

[0027] The working process of the utility model is as follows:

[0028] The clamps of the application are connected with the moving cross beam and the workbench of the testing machine through the mounting seat 1, the two clamps are arranged opposite to each other, the distance between the two clamps is adjusted, the two ends of the rectangular sample 8 are respectively placed into the square through slot 22 of the two clamps, the speed reducer motor is started, the speed reducer motor is positively rotated to drive the lead screw 14 to positively rotate, at this time, the sliding block 13 can move forward along the length direction of the lead screw 14 under the limiting action of the sliding groove 12, the swing rod 10 on the sliding block 13 moves forward synchronously, the connecting rods hinged at the two ends of the swing rod 10 move forward to push the upper annular plate 16 and the lower annular plate 15 respectively, the waist circular through slot 5 on the upper annular plate 16 exerts force on the upper guide rod 6, the waist circular through slot 5 on the lower annular plate 15 exerts force on the lower guide rod 6, the limiting of the guide through slot on the middle clamping seat 18 on the guide rod 6 is matched, so that when the upper annular plate 16 and the lower annular plate 15 rotate, the four clamping blocks 7 in the clamping seat 18 move towards the rectangular sample 8 along the direction of the guide through slot on the clamping seat 18 at the same time, and the rectangular sample 8 is gradually clamped and fixed.

[0029] Similarly, the speed reducer motor is controlled to reverse, and then the clamping of the rectangular sample 8 can be released in the reverse direction, and the rectangular sample 8 is conveniently taken out of the clamp.

[0030] Of course, the above description is not limited to the above examples, and the technical features not described in the application can be realized by or using the prior art, which will not be described here; the above embodiments and the drawings are only used to illustrate the technical scheme of the application and are not a limitation of the application, the preferred embodiments are described in detail, and those skilled in the art should understand that the changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the application do not deviate from the purpose of the application, and should also belong to the protection scope of the claims of the application.

Claims

1. A tensile test fixture characterized by: The disc seat is vertically fixed with two arc-shaped vertical plates which are arranged opposite to each other on the circumferential edge of the upper surface of the disc seat, the top of the two arc-shaped vertical plates is connected with a ring-shaped cover plate which is concentric with the disc seat, a clamping seat which is located above the disc seat and concentric with the disc seat is connected between the two arc-shaped vertical plates, a square through slot is formed in the center of the clamping seat, a through rectangular slot is formed in the center of the four inner walls of the square through slot along the vertical inner wall direction, the bottom surface of one set of mutually opposite rectangular slots is provided with a lower guide through slot which penetrates the bottom surface of the clamping seat along the width center line, the top surface of the other set of mutually opposite rectangular slots is provided with an upper guide through slot which penetrates the surface of the clamping seat along the width center line, a clamping block is movably arranged in each rectangular slot, a guide rod which is opposite to the guide through slot is connected to the clamping block, a lower ring-shaped plate is arranged between the disc seat and the clamping seat, an upper ring-shaped plate is arranged between the ring-shaped cover plate and the clamping seat, the lower ring-shaped plate is provided with a waist round through slot which is staggered with the lower guide through slot and used for accommodating the guide rod, the upper ring-shaped plate is provided with a waist round through slot which is staggered with the upper guide through slot and used for accommodating the guide rod, and a power mechanism is installed on one of the arc-shaped vertical plates and used for driving the coaxial rotation of the upper ring-shaped plate and the lower ring-shaped plate.

2. The tensile test jig according to claim 1, characterized by: The power mechanism comprises a fixed seat which is connected to the outer side of the arc-shaped vertical plate, a sliding groove is formed in the upper surface of the fixed seat along the diameter direction of the disc, and a sliding block is slidably connected in the sliding groove, a lead screw which penetrates the sliding block and is threadedly connected with the sliding block is rotatably installed in the sliding groove along the length direction of the sliding groove; an oscillating rod is arranged on the sliding block, the middle part of the oscillating rod is hinged to the sliding block, the upper end of one end of the oscillating rod is hinged to an upper connecting rod, and the lower end of the other end of the oscillating rod is hinged to a lower connecting rod, the end of the upper connecting rod is hinged to the upper ring-shaped plate, and the end of the lower connecting rod is hinged to the lower ring-shaped plate.

3. The tensile test grip of claim 2, wherein: A speed reduction motor is installed on the fixed seat, and the driving shaft of the speed reduction motor is connected with one end of the lead screw through a shaft coupling.

4. The tensile test grip of claim 1, wherein: The disc seat is fixed on a mounting seat, and a mounting hole for connecting with a testing machine is formed in the mounting seat.

5. The tensile test grip of claim 1, wherein: The clamping surface of the clamping block is provided with a flexible rubber pad.

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