Clamping device of tensile testing machine

Abstract

The utility model discloses a clamping device of a tensile testing machine, which comprises an upper connecting column, and an inserting concave hole is formed in the middle of the bottom surface of the upper connecting column; the upper connecting and clamping assembly is mounted in the upper connecting column; the upper connecting and clamping assembly comprises a fixed connecting column, and the fixed connecting column is installed on the upper connecting column. The rubber sheet clamping device is rapid in clamping, the two clamping parts can be far away from each other and the end parts of a rubber sheet to be detected can be clamped and fixed only by enabling the upper parts of the two side connecting arms to be close to each other by hands, the rubber sheet clamping device is convenient to assemble and disassemble, simple in structure and low in manufacturing cost, and the two ends of the transverse fixing rod are large-diameter ends, and the outer diameter of the transverse fixing rod is larger than the outer diameter of the middle part of the transverse fixing rod. Therefore, when the upper connecting column is inserted, a limiting effect is achieved, the upper connecting column is not easy to move during installation, and the installation effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to material detection technical field, more specifically relates to a clamping device of tensile testing machine. BACKGROUND

[0002] Tensile testing machine is also called material tensile testing machine, universal tensile strength testing machine, which is a new generation of mechanics detection equipment integrating computer control, automatic measurement, data acquisition, screen display and test result processing.

[0003] It is mainly suitable for testing of metal and non-metal materials, such as rubber, plastic, wire and cable, optical fiber and cable, safety belt, safety belt, leather belt composite material, plastic profile, waterproof roll material, steel pipe, copper material, profile, spring steel, bearing steel, stainless steel (and other high hardness steel), casting, steel plate, steel belt, non-ferrous metal wire, tensile, compression, bending, shearing, peeling, tearing, two-point extension (need to be equipped with an extensometer) and other tests.

[0004] However, in the existing rubber test, the rubber needs to be clamped on the chuck, and the chuck in the existing tensile testing machine generally adopts a jaw type clamping structure. The two clamping parts of the jaw type structure are generally driven by hydraulic or pneumatic clamping, which has a relatively complex structure and relatively firm clamping. It is generally suitable for testing of metal materials. However, the clamping force required for the tensile test of some rubber materials and other products is not too large. Therefore, it is not necessary to use the jaw type structure driven by hydraulic or pneumatic clamping.

[0005] However, the existing clamping of rubber products adopts two clamping plates fixed by bolts, and the clamping part of the rubber is between the two clamping plates. By tightening the bolts, the two clamping plates are brought close to each other to achieve clamping. The rotation of the bolts requires corresponding wrench adjustment, which is relatively troublesome to install.

[0006] Meanwhile, the chuck of the existing tensile testing machine generally uses a positioning pin for positioning and fixing. The existing positioning pin is a horizontal cylindrical rod with a uniform outer diameter, which has no limiting structure, so that it can move left and right during installation, making the installation relatively troublesome. UTILITY MODEL CONTENTS

[0007] The utility model aims at overcoming the defects of the prior art and provides a clamping device of tensile testing machine. The clamping device is fast, and only needs to bring the upper parts of the two side connecting arms close to each other to achieve the far away of the two clamping parts, clamp and fix the end part of the rubber sheet to be detected. The clamping device is convenient to assemble and disassemble, simple in structure, low in manufacturing cost, and has large diameter end parts at both ends of the horizontal fixing rod, which has a larger outer diameter than the middle part of the horizontal fixing rod. Therefore, the horizontal fixing rod has a limiting effect when inserted into the upper connecting column, so that it is not easy to move during installation, and the installation effect is good.

[0008] The technical problem is solved by the utility model, and the scheme is as follows:

[0009] A clamping device of a tensile testing machine, comprising an upper connecting column, a plug-in recess is formed in the middle of the bottom surface of the upper connecting column;

[0010] The upper connecting clamping assembly is installed in the upper connecting column;

[0011] The upper connecting clamping assembly comprises a fixed connecting column, which is installed on the upper connecting column;

[0012] A connecting part extending downward is formed in the middle of the bottom surface of the fixed connecting column, the lower parts of two upper connecting arms are movably connected to the connecting part through a same hinged shaft, the upper parts of the two upper connecting arms are away from each other and movably connected with side connecting arms through hinged shafts respectively, the lower parts of the two side connecting arms are close to each other, two transverse blocks corresponding in front and back are located at the front part and the rear part of the lower parts of the two side connecting arms, and the two transverse blocks are movably connected to the two side connecting arms through two hinged shafts;

[0013] The bottom parts of the two side connecting arms are fixed with or formed with clamping parts extending forward and backward, and toothed surfaces are formed on the opposite wall surfaces of the two clamping parts;

[0014] The bottom surface of the connecting part is pressed against the top end of a compression spring, and the bottom end of the compression spring is pressed against the top surface of the two transverse blocks.

[0015] A vertical screwing part is formed in the middle of the top surface of the fixed connecting column, the vertical screwing part is inserted into the plug-in recess of the upper connecting column, a transverse through hole extending leftward and rightward and penetrating the outer side wall of the vertical screwing part is formed in the middle of the vertical screwing part, the transverse through hole is communicated with the side through holes on the left and right side walls of the plug-in recess, a transverse fixed rod is inserted into the transverse through hole and the two side through holes, and the left and right ends of the transverse fixed rod extend out of the outer ends of the two side through holes;

[0016] A locking nut is screwed on the vertical screwing part, the top surface of the locking nut is pressed against the bottom surface of the upper connecting column, the middle top surface of the transverse fixed rod is pressed against the top surface of the transverse through hole, and the bottom surface of the part of the transverse fixed rod located in the side through hole is pressed against the bottom surface of the corresponding side through hole.

[0017] The two ends of the transverse fixed rod are large-diameter end parts with an outer diameter larger than that of the transverse fixed rod, and the bottom surface of the large-diameter end parts is lower than the bottom surface of the corresponding side through hole.

[0018] The middle top surface of the two transverse blocks corresponding in front and back is formed with a groove, the front and rear parts of the middle fixing plate extending in front and back are in the corresponding grooves and are fixed on the two transverse blocks through bolts or welding, the bottom surface of the compression spring is pressed against the middle top surface of the middle fixing plate, the middle top surface of the middle fixing plate is formed with a lower protruding part, and the lower protruding part is inserted into the lower part of the compression spring.

[0019] The middle part of the opposite wall surfaces of the upper part of the two clamping parts is formed with an arc-shaped clamping groove, and the opposite wall surfaces of the lower part of the two clamping parts are toothed surfaces.

[0020] The protruding effect of the utility model is:

[0021] Compared with the prior art, it clamps quickly, only needs to approach the upper parts of the two side connecting arms, can realize that the two clamping parts are far away from each other, realizes clamping and fixing of the end part of the rubber sheet to be detected, is convenient to assemble and disassemble, simple in structure, low in manufacturing cost, and moreover the two ends of the transverse fixing rod are large-diameter end parts, the outer diameter is greater than the outer diameter of the middle part of the transverse fixing rod, thereby having a limiting effect when being inserted into the upper connecting column, so that the transverse fixing rod is not easy to shift during installation, and the installation effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a partial structure schematic view of the utility model;

[0023] Figure 2 It is Figure 1 a partial enlarged view;

[0024] Figure 3 It is a partial sectional view at the transverse block and the clamping part;

[0025] Figure 4 It is a partial sectional view at the clamping part. DETAILED DESCRIPTION

[0026] Embodiment, see as Figures 1 to 4 shown, a clamping device of a tensile testing machine, comprising an upper connecting column 10, the bottom surface middle part of the upper connecting column 10 is formed with an insertion recess 11;

[0027] The upper connecting clamping assembly 20 is installed in the upper connecting column 10;

[0028] The upper connecting clamping assembly 20 comprises a fixed connecting column 21, and the fixed connecting column 21 is installed on the upper connecting column 10;

[0029] The bottom surface of the fixed connecting column 21 is formed with a downward extending connecting portion 22, the lower portions of two upper connecting arms 23 are movably connected to the connecting portion 22 through a same hinged shaft, the upper portions of the two upper connecting arms 23 are away from each other and movably connected with side connecting arms 24 through hinged shafts respectively, the lower portions of the two side connecting arms 24 are close to each other, two transverse blocks 25 are arranged at the front and rear portions of the lower portions of the two side connecting arms 24, and the two transverse blocks 25 are movably connected to the two side connecting arms 24 through two hinged shafts;

[0030] The bottom portions of the two side connecting arms 24 are fixed or formed with front and rear extending clamping portions 26, and the opposite wall surfaces of the two clamping portions 26 are formed with toothed surfaces;

[0031] The bottom surface of the connecting portion 22 is pressed against the top end of a compression spring 100, and the bottom end of the compression spring 100 is pressed against the top surfaces of the two transverse blocks 25.

[0032] In the tensile testing machine, the upper connecting column 10 is fixed to the lower portion of a load sensor (such as a force sensor) fixed to the upper portion, and the lower connecting column 50 is fixed to the top plate of the frame below the upper connecting column 10. The upper connecting column 10 is provided with the upper connecting clamping assembly 20, and the lower connecting column 50 is also provided with the lower connecting clamping assembly 60. The lower connecting clamping assembly 60 is completely the same in structure as the upper connecting clamping assembly 20, and the two are symmetrical. The structure of the lower connecting column 50 is basically the same as that of the upper connecting column 10, so the structure of the lower connecting column 50 and the lower connecting clamping assembly 60 are not described in detail.

[0033] Further, the top surface of the fixed connecting column 21 is formed with a vertical screwing portion 211, the vertical screwing portion 211 is inserted into the insertion recess hole 11 of the upper connecting column 10, the middle portion of the vertical screwing portion 211 is formed with a transverse through hole 212 extending left and right and penetrating the outer side wall of the vertical screwing portion 211, the transverse through hole 212 communicates with the side through holes 111 on the left and right side walls of the insertion recess hole 11, the transverse fixing rod 30 is inserted into the transverse through hole 212 and the two side through holes 111, and the left and right ends of the transverse fixing rod 30 extend out of the outer ends of the two side through holes 111.

[0034] The vertical screwing portion 211 is screwed with a locking nut 1, the top surface of the locking nut 1 is pressed against the bottom surface of the upper connecting column 10, the middle top surface of the transverse fixing rod 30 is pressed against the top surface of the transverse through hole 212, and the bottom surface of the portion of the transverse fixing rod 30 in the side through hole 111 is pressed against the bottom surface of the corresponding side through hole 111.

[0035] Further, the two ends of the transverse fixing rod 30 are large-diameter end portions 31 with an outer diameter larger than that of the middle portion of the transverse fixing rod 30, and the bottom surface of the large-diameter end portion 31 is lower than that of the corresponding side through hole 111. The outer diameter of the large-diameter end portion 31 is smaller than the inner diameter of the side through hole 111 and the transverse through hole 212.

[0036] Further, the middle portion of the bottom surface of the connecting portion 22 is formed with a vertical guide column 27 inserted into the middle through hole of the compression spring 100.

[0037] Further, the upper connecting arm 23 is composed of two corresponding front and rear half connecting arms, the lower portions of the two half connecting arms are movably connected to the connecting portion 22 through the same hinged shaft, and the upper portion of the side connecting arm 24 is between the upper portions of the two corresponding half connecting arms and movably connected through a hinged shaft.

[0038] Further, the middle top surface of the two corresponding front and rear transverse blocks 25 is formed with a recess, the front and rear portions of the middle fixing plate 251 extending front and rear are in the corresponding recesses and fixed on the two transverse blocks 25 through bolts or welding, the bottom surface of the compression spring 100 is pressed against the middle top surface of the middle fixing plate 251, the middle top surface of the middle fixing plate 251 is formed with a lower protruding portion 252 inserted into the lower portion of the compression spring 100.

[0039] Further, the front and rear side walls of the lower portions of the two side connecting arms 24 are formed with upper horizontal limiting protruding strips 241, the top surface of the corresponding transverse block 25 is close to the corresponding upper horizontal limiting protruding strip 241, and the front and rear portions of the clamping portion 26 are below the corresponding transverse block 25. This structure limits the turning range of the two side connecting arms 24, i.e. limits the turning opening range between the clamping portions 26 of the two side connecting arms 24.

[0040] Further, the middle portions of the opposite wall surfaces of the upper portions of the two clamping portions 26 are formed with arc-shaped clamping recesses 261, and the lower portions of the two clamping portions 261 are toothed surfaces.

[0041] In use, the two side connecting arms 24 of the upper connecting clamping assembly 20 are pressed by hand to make the two clamping portions 26 far away from each other, the end portion of the rubber sheet to be tested is inserted between the two clamping portions 26, then the hand is released, and the elastic recovery of the compression spring 100 can realize the approaching of the two clamping portions 26 to clamp the end portion of the rubber sheet. Similarly, the lower portion of the two side connecting arms 24 of the lower connecting clamping assembly 60 can be pressed by hand to make the two clamping portions 26 of the upper portions of the two side connecting arms 24 of the lower connecting clamping assembly 60 far away from each other, so that the bottom end portion of the rubber sheet is between the two corresponding clamping portions 26 for clamping and fixing.

[0042] When disassembling, only need to press the corresponding two side connecting arms 24 with hands, so that the corresponding two clamping parts 26 are separated, so that the rubber sheet can be removed from between them, realizing disassembly, very convenient.

[0043] Meanwhile, when the upper connecting clamping assembly 20 and the lower connecting clamping assembly 60 of the embodiment need to be disassembled, only need to unscrew the corresponding locking nut 1, then adjust the height of the transverse fixing rod 30 to ensure that the large diameter end 31 of the transverse fixing rod 30 is aligned with the corresponding side through hole 111, and then remove it, so that the upper connecting clamping assembly 20 or the lower connecting clamping assembly 60 can be removed from the corresponding upper connecting column 10 or the lower connecting column 50, which is convenient to disassemble;

[0044] When installing, only need to insert the transverse fixing rod 30 into the transverse through hole 212 of the vertical screw part 211 of the corresponding upper connecting clamping assembly 20 or the lower connecting clamping assembly 60 and the corresponding two side through holes 111, the large diameter end 31 of the left and right ends of the transverse fixing rod 30 extends out of the outer end of the two side through holes 111, so that the bottom surface of the large diameter end 31 is lower than the bottom surface of the corresponding side through hole 111, so that the transverse fixing rod 30 is limited, and then only need to rotate the corresponding locking nut 1 to tighten, so as to complete the fixing, wherein in the lower connecting clamping assembly 60 below, as the locking nut 1 is tightened, the transverse fixing rod 30 below is lifted, so that the top surface of the corresponding position of the transverse fixing rod 30 below is pressed against the top surface of the corresponding side through hole 111, while the top surface of the corresponding large diameter end 31 is higher than the top surface of the corresponding side through hole 111, realizing limiting locking, so that the transverse fixing rod 30 is not easy to move left and right, ensuring firm fixing.

[0045] The middle part of the opposite wall surface of the upper part of the two clamping parts 26 is formed with an arc-shaped clamping groove 261, and the opposite wall surface of the lower part of the two clamping parts 261 is a toothed surface, and the arc-shaped clamping groove 261 can ensure that when the end part of the rubber sheet to be tested has a thickness greater than the end part of the main body, it can be in the arc-shaped clamping groove 261, thereby ensuring the clamping effect.

[0046] Finally, it should be pointed out that the above embodiments are only more representative examples of the present application. Obviously, the present application is not limited to the above embodiments, and many modifications can be made. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments shall be considered to fall within the protection scope of the present application.

Claims

1. A clamping device for a tensile testing machine comprising an upper connecting column (10), characterised in that: A plug-in recess (11) is formed in the middle of the bottom surface of the upper connecting column (10); The upper connecting clamping assembly (20) is installed in the upper connecting column (10); The upper connecting clamping assembly (20) comprises a fixed connecting column (21) installed on the upper connecting column (10); The middle of the bottom surface of the fixed connecting column (21) is formed with a downward extending connecting part (22), the lower parts of two upper connecting arms (23) are movably connected to the connecting part (22) through a same hinge shaft, the upper parts of the two upper connecting arms (23) are away from each other and movably connected with side connecting arms (24) through hinge shafts respectively, the lower parts of the two side connecting arms (24) are close to each other, two transverse blocks (25) corresponding in front and back are located at the front and back of the lower parts of the two side connecting arms (24), and the two transverse blocks (25) are movably connected to the two side connecting arms (24) through two hinge shafts. The bottom of each side connecting arm (24) is fixed with or formed with a front and back extending clamping part (26), and a toothed surface is formed on the opposite wall surface of each clamping part (26). The bottom surface of the connecting part (22) abuts against the top end of a compression spring (100), and the bottom end of the compression spring (100) abuts against the top surface of the two transverse blocks (25).

2. A clamping device for a tensile testing machine according to claim 1, characterized in that: The middle of the top surface of the fixed connecting column (21) is formed with a vertical screwing part (211) inserted into the plug-in recess (11) of the upper connecting column (10), the middle of the vertical screwing part (211) is formed with a transverse through hole (212) extending left and right and penetrating through the outer side wall of the vertical screwing part (211), the transverse through hole (212) communicates with the side through holes (111) on the left and right side walls of the plug-in recess (11), a transverse fixed rod (30) is inserted into the transverse through hole (212) and the two side through holes (111), and the left and right ends of the transverse fixed rod (30) extend out of the outer ends of the two side through holes (111). A locking nut (1) is screwed on the vertical screwing part (211), the top surface of the locking nut (1) abuts against the bottom surface of the upper connecting column (10), the middle top surface of the transverse fixed rod (30) abuts against the top surface of the transverse through hole (212), and the bottom surface of the part of the transverse fixed rod (30) located in the side through hole (111) abuts against the bottom surface of the corresponding side through hole (111).

3. A clamping device for a tensile testing machine according to claim 2, characterised in that: The two ends of the transverse fixed rod (30) are large diameter end parts (31) with an outer diameter larger than that of the transverse fixed rod (30), and the bottom surface of each large diameter end part (31) is lower than the bottom surface of the corresponding side through hole (111).

4. A clamping device for a tensile testing machine according to claim 1, characterized in that: The middle of the bottom surface of the connecting part (22) is formed with a vertical guide column (27) inserted into the middle through hole of the compression spring (100).

5. The gripping device of a tensile testing machine according to claim 1, characterized in that: The upper connecting arm (23) is composed of two half connecting arms corresponding in front and back, the lower parts of the two half connecting arms are movably connected to the connecting part (22) through a same hinge shaft, and the upper part of the side connecting arm (24) is located between the upper parts of the two half connecting arms and is movably connected through a hinge shaft.

6. A clamping device for a tensile testing machine according to claim 1, characterized in that: The middle top surface of the two transverse blocks (25) corresponding in front and back is formed with a groove, the front and rear of the middle fixing plate (251) extending in front and back is in the corresponding groove and is fixed on the two transverse blocks (25) by bolts or welding, the bottom surface of the compression spring (100) is pressed against the middle top surface of the middle fixing plate (251), the middle top surface of the middle fixing plate (251) is formed with a lower protruding part (252), and the lower protruding part (252) is inserted into the lower part of the compression spring (100).

7. A clamping device for a tensile testing machine according to claim 1, characterized in that: The lower part of the two side connecting arms (24) is formed with an upper horizontal limiting protruding strip (241) on the front side wall and the rear side wall, the top surface of the corresponding transverse block (25) is close to the corresponding upper horizontal limiting protruding strip (241), and the front and rear of the clamping part (26) are below the corresponding transverse block (25).

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