Clamping tool for steel wire tensile testing machine

Abstract

The utility model discloses a clamping tool for a steel wire tensile testing machine, which relates to the technical field of tensile testing equipment and comprises a base station, a rotating disc, a movable clamping plate component, a transmission mechanism and a positioning mechanism. The movable clamping plate assembly is installed on the side wall of the base table and connected with the base table in a sliding mode, the transmission mechanism converts rotating motion of the rotating disc into radial motion of the clamping plate assembly on the base table, the positioning mechanism fixes the movable clamping plate assembly and the transmission mechanism to needed positions, and therefore steel wire rings arranged at the two ends of a steel wire are clamped. The steel wire is uniformly stressed in the stretching process, and the test data is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of tensile testing equipment, and more specifically, to a clamping tool for a steel wire tensile testing machine. Background Art

[0002] The wire tensile tester is an experimental device specially used to test the tensile deformation performance of materials. The data obtained from the tensile test can be used to determine the elastic limit, elongation, elastic modulus, proportional limit, cross-sectional shrinkage, tensile strength, yield point, yield strength and other tensile performance indicators of the material. The tensile test usually requires a tensile clamp as an auxiliary. When testing the strength of the steel wire, in order to improve the accuracy of the test data, it should also be considered that the force on the steel wire is uniform everywhere, so as to improve the test quality. In the existing technology, for example, a steel wire tensile tester clamp disclosed in the publication number CN205138885U, during the test, one end of the steel wire rope sample is passed through the movable plug-in block of the upper clamp, and locked with a fixed nut to clamp the steel wire rope sample. The other end of the steel wire rope passes through the lower clamp, and the same treatment as the upper clamp is performed to perform the tensile test. However, this clamp is prone to cause the steel wire to be subjected to different forces in the contact part and the non-contact part of the clamp when in use, which may cause fracture in the clamping part, and the tensile test effect is poor. Utility Model Content

[0003] In order to solve the problem of uneven force on various parts of the steel wire during the tensile test, the utility model provides a clamping tool for a steel wire tensile testing machine, which achieves fixed clamping of the steel wire and maintains a stable clamping force through the cooperation of a base, a rotating disk, a movable clamping plate assembly, a transmission mechanism and a positioning mechanism, so that various parts of the steel wire are evenly stressed and an excellent tensile test effect is obtained.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] The utility model provides a clamping tool for a steel wire tensile testing machine, comprising a base, a rotating disk, a movable clamping plate assembly, a transmission mechanism for converting the rotating motion of the rotating disk into radial motion of the movable clamping plate assembly along the base, and a positioning mechanism for maintaining the relative position of the rotating disk and the base; the rotating disk is installed on the base; at least two groups of movable clamping plate assemblies are arranged on the outside of the base; the transmission mechanism is arranged between the rotating disk and the movable clamping plate assembly; and the positioning mechanism is arranged between the base and the rotating disk.

[0006] The clamping tool for a steel wire tensile testing machine of the utility model, when clamping the steel wire, firstly installs each movable clamping plate assembly on the outer side of the base, then rotates the rotating disk, and the transmission mechanism converts the rotating motion of the rotating disk into radial displacement of the movable clamping plate assembly, when the movable clamping plate assembly moves to be in close contact with the steel wire ring, the relative positions of the rotating disk, the movable clamping plate assembly and the base are fixed by the positioning mechanism, so as to complete the stable clamping of the steel wire, and the steel wire is evenly stressed, so that the stretching process is more stable and the tensile performance test data is more accurate.

[0007] Furthermore, the transmission mechanism includes a movable column and a movable hole, the movable hole is in two groups and the two groups of movable holes are opened on the upper and lower end surfaces of the rotating disk, the movable column is connected to the movable clamping plate assembly, and the movable column is movably connected to the movable hole. The movable column moves relatively under the restriction of the movable hole, and the rotation of the rotating disk is changed into radial movement on the movable clamping plate assembly.

[0008] Furthermore, the movable hole includes a first end hole, a second end hole and a connecting hole, the first end hole and the second end hole are both arranged in a circular ring around the center of the rotating disk, the connecting hole is connected to the first end hole and the second end hole in an arc shape, the arcs of the connecting holes have the same bending direction, and the radius of the circular ring array of the first end holes is smaller than the radius of the circular ring array of the second end holes. The arcs of the connecting holes are set to have the same bending direction and bending radius, so that when the rotating disk rotates, each movable column can be controlled to move the same distance in the movable hole, thereby ensuring that the radial displacement of each movable splint assembly is the same.

[0009] Furthermore, anti-dropout blocks are respectively provided at both ends of the movable column. The structure of the anti-dropout blocks prevents the movable column from axially moving in the movable hole, making the clamping more stable and preventing the movable column from being separated from the movable hole.

[0010] Furthermore, the movable clamping plate assembly includes a clamping plate and a shaft, one end of the shaft is connected to the movable column, and the other end is fixedly connected to the clamping plate, and an arc groove for clamping the wire ring is arranged on the outer side of the clamping plate. When clamping the wire, the shaft pushes the movable clamping plate assembly to move radially on the base under the action of the movable column, so that the outer arc groove forms a tight fit with the wire.

[0011] Furthermore, the clamping plate is provided with a limit strip, the base is provided with a first limit slot, and the limit strip is slidably connected to the first limit slot. The slidable connection between the limit strip and the first limit slot allows the radial movement of the movable splint assembly on the base to have a stable movement direction, ensuring that the forces exerted on the steel wire by each movable splint assembly are of the same magnitude.

[0012] Furthermore, at least three groups of movable clamping plate assemblies are arranged outside the base, forming a circular array around the base. The multiple groups of movable clamping plate assemblies in the circular array can make the clamped part of the wire more evenly stressed, thereby improving the accuracy of the test results.

[0013] Furthermore, the base includes a bottom plate, a fixed seat, a rotating seat and a fixed frame, the fixed seat is arranged above the bottom plate, the rotating seat is arranged at the center of the fixed seat, the side wall of the fixed seat is provided with a second limiting groove matched with the clamping plate, the outer side of the rotating seat is provided with a fixed frame, the fixed frame is provided with a limiting hole corresponding to the shaft rod, and the shaft rod passes through the limiting hole. The clamping plate is installed at the side wall of the fixed seat, and the shaft rod passes through the limiting hole. The two together prevent the clamping plate from axially moving or rotating on the base, which can increase the stability during the tensile test.

[0014] Furthermore, a fixedly connected rotating handle is provided at the top of the rotating disk, and the setting of the rotating handle is conducive to manually controlling the rotation of the rotating disk and the radial movement distance of the movable clamping plate assembly, thereby regulating the force of clamping the steel wire.

[0015] Furthermore, the positioning mechanism includes a fixing bolt and an axis roller, one end of the axis roller is fixedly connected to the base, and the other end is rotatably connected to the rotating disk, the fixing bolt includes a rotating part and a connecting part, the rotating part is rotatably connected to the rotating disk, and the connecting part is threadedly connected to the axis roller. Before clamping begins, the fixing bolt is first rotated counterclockwise to move it upward, and the threaded connection between it and the axis roller is released, so that the rotating disk can be freely rotated to adjust the position. When the movable clamping plate assembly is in close contact with the steel wire, the fixing bolt is rotated clockwise to move it downward, and the threaded connection between it and the axis roller is restored, and the relative positions of the rotating disk, the base and the movable clamping plate assembly are fixed.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The steel wire is fixedly clamped by the cooperation of the base, rotating disk, movable splint assembly, transmission mechanism and positioning mechanism. The evenly arranged movable splint assemblies ensure that each part of the steel wire is subjected to the same force, avoiding breakage in the clamping part, and making the tensile test result more accurate.

[0018] 2. When in use, install the movable splint assembly on the base. You only need to rotate the handle and the fixing bolt to control the radial movement of the movable splint assembly and stably clamp the steel wire. It has a simple structure, is easy to use, and improves the efficiency of the tensile test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1A schematic diagram of the overall structure of the clamping tooling for the steel wire tensile testing machine provided by the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the clamping tool for the steel wire tensile testing machine provided by the utility model after removing the movable clamping plate assembly;

[0022] Figure 3 An exploded view of the connection between the fixing mechanism, the rotating disk and the rotating seat provided by the utility model;

[0023] Figure 4 This is a structural schematic diagram of the movable splint assembly provided by the utility model.

[0024] Description of reference numerals:

[0025] 1. Base; 11. Bottom plate; 111. First limiting groove; 12. Fixed seat; 121. Second limiting groove; 13. Rotating seat; 14. Fixed frame; 141. Limiting hole; 2. Rotating disk; 21. Rotating handle; 3. Movable splint assembly; 31. Clamping plate; 311. Limiting strip; 32. Axle rod; 4. Transmission mechanism; 41. Movable column; 411. Anti-slip block; 42. Movable hole; 421. First end hole; 422. Second end hole; 423. Connecting hole; 5. Positioning mechanism; 51. Shaft roller; 52. Fixing bolt; 521. Rotating part; 522. Connecting part. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] In this embodiment, before the steel wire tensile test begins, it is first necessary to set two steel wire rings at both ends of the steel wire by welding. The weld strength should be guaranteed during welding, at least an equal-strength weld, so that the tensile strength of the steel wire welding connection is greater than or equal to the tensile strength of the base material of the steel wire to prevent breakage at the weld during the tensile test.

[0032] like Figures 1 to 4 As shown, the clamping fixture for a wire tensile testing machine provided in this embodiment includes a base 1, a rotating disk 2, a movable clamping plate assembly 3, a transmission mechanism 4 for converting the rotational motion of the rotating disk 2 into the radial motion of the movable clamping plate assembly 3 along the base 1, and a positioning mechanism 5 for maintaining the relative position of the rotating disk 2 and the base 1. The transmission mechanism can adopt a structure such as a movable column and a movable hole, a worm gear or a gear transmission, and the positioning mechanism can adopt a structure such as a bolt and a shaft roller or a movable latch.

[0033] The base 1 includes a bottom plate 11, a fixed seat 12, a rotating seat 13 and a fixed frame 14. The fixed seat 12 is installed just above the center of the bottom plate 11, and the rotating seat 13 is installed at the center of the fixed seat 12 by bolts. The side wall of the fixed seat 12 is provided with a second limiting groove 121 with the same number as the clamping plate 31. The fixed frame 14 has a larger diameter than the rotating seat 13, is installed outside the rotating seat 13, and is provided with limiting holes 141 corresponding to the shaft rods 32 on the side wall of the fixed frame 14.

[0034] The movable clamping plate assembly 3 includes a clamping plate 31 and a shaft 32. One end of the shaft 32 is connected to the transmission mechanism 4, and the other end is fixedly connected to the clamping plate 31. An arc groove for clamping the wire ring is provided on the outer side of the clamping plate 31. A limit bar 311 is provided on the clamping plate, and a first limit groove 111 is provided on the bottom plate 11. The limit bar 311 is slidably connected to the first limit groove 111. This embodiment adopts 6 groups of evenly arranged movable clamping plate assemblies 3, which are arranged in a circular array around the base 1 and move synchronously to ensure that each part of the wire ring is evenly stressed.

[0035] When installing the movable clamping plate assembly 3 , the shaft rod 32 needs to pass through the limiting hole 141 , and the clamping plate 32 passes through the second limiting groove.

[0036] The rotating disk 2 is mounted on the base 1 and is cylindrical in shape with a through hole at the center and a fixedly connected rotating handle 21 at the top for manually controlling the rotation of the rotating disk 2 and adjusting the position and clamping force of the movable clamp assembly 3.

[0037] When starting the tensile test, first install the movable splint assembly 3 on the fixed frame 14 according to the experimental requirements. After the installation is completed, the clamping tooling is installed at both ends of the tensile testing machine, and then the wire loops at both ends of the steel wire are put on the outer grooves of the movable splint assembly 3.

[0038] At this time, rotating the rotating handle 21 drives the rotating disk 2 to start rotating, and the rotational motion of the rotating disk 2 is converted into radial movement of each movable clamping plate assembly 3 on the base through the transmission mechanism, pushing each clamping plate 31 to move outward as a whole, close to the wire ring for clamping, until the clamping plate 61 is tightly attached to the outer wall of the wire ring, and then the fastening of the rotating disk 2 is completed through the positioning mechanism 5, thereby keeping each movable clamping plate assembly 3 stationary and maintaining an excellent wire ring clamping effect.

[0039] After the tensile test is completed, the fastening of the rotating disk 2 by the positioning mechanism is released, the rotating disk 2 is rotated, and the various movable clamping plate assemblies 3 are driven to approach the center of the base on the base through the transmission mechanism, and the wire ring is loosened.

[0040] When conducting a wire tensile test, the same operations as above need to be performed on the clamps at both ends of the tensile machine, so that the wire ring can be clamped firmly, and each part is evenly stressed when the wire is stretched, avoiding the wire from breaking at the clamping part.

[0041] Embodiment 2

[0042] like Figures 1 to 2As shown, this embodiment is similar to the first embodiment, except that the transmission mechanism 4 of this embodiment includes a movable column 41 and a movable hole 42. The movable holes 42 are two groups, and the two groups of movable holes 42 are opened on the upper and lower end surfaces of the rotating disk 2. The movable column 41 is connected to the movable clamping plate assembly 3, and the movable column 41 is movably connected with the movable hole 42. The movable hole 42 includes a first end hole 421, a second end hole 422 and a connecting hole 423. The connecting hole 423 is connected to the first end hole 421 and the second end hole 422 in an arc shape. The bending direction of the arc of the connecting hole 423 is the same as the bending radius. When the rotating disk 2 rotates, each movable column 41 can be controlled to move the same distance in the movable hole 42, thereby ensuring that the radial displacement of each movable clamping plate assembly 3 is the same. The first end hole 421 and the second end hole 422 have the same diameter, and the distance between the two arcs of the connecting hole 423 is the same. The diameter of the cross-section circle of the movable column 41 is slightly smaller than the diameters of the first end hole 421 and the second end hole 422 , so as to ensure that the movable column 41 can move continuously in the movable hole 42 .

[0043] Anti-dropout blocks 411 are respectively provided at both ends of the movable column 41, and the diameter of the anti-dropout blocks 411 is slightly larger than the diameter of the first end hole 421. The structure of the anti-dropout blocks 411 prevents the movable column 41 from axially moving in the movable hole 42, making the clamping more stable and preventing the movable column 41 from being separated from the movable hole 42.

[0044] The first end hole 421 and the second end hole 422 are both arranged in a circular array around the center of the rotating disk, and the radius of the circular array of the first end hole 421 is smaller than the radius of the circular array of the second end hole 422. When clamping the steel wire, the rotating disk 13 is rotated counterclockwise, and the movable column 41 moves from the first end hole 421 to the second end hole 422 along the connecting hole 423 of the movable hole 42 under the restriction of the movable hole 42, and the shaft 62 fixedly connected to the side of the movable column 41 pushes each movable clamping plate assembly 3 to move radially away from the center of the base 1 along the first limiting groove 111 until the arc groove provided on the outer side of the clamping plate 31 is in close contact with the steel wire to achieve a suitable clamping force. After the tensile test is completed, the rotating disk 13 is rotated clockwise, and the movable column 41 moves from the second end hole 422 to the first end hole 421 along the connecting hole 423 of the movable hole 42 under the restriction of the movable hole 42, and each movable clamping plate assembly 3 is separated from the steel wire, and the steel wire that has completed the tensile test can be removed.

[0045] The transmission mechanism here may also adopt other transmission modes such as worm gear transmission, gear transmission, etc. to realize the conversion of the rotation of the rotating disk into the radial movement of the movable clamping plate assembly.

[0046] Embodiment 3

[0047] like Figure 3As shown, this embodiment is similar to the first embodiment, except that the positioning mechanism 5 of this embodiment includes a shaft roller 51 and a fixing bolt 52, one end of the shaft roller 51 is fixedly connected to the rotating seat 13, and the other end is rotatably connected to the rotating disk 2, and the fixing bolt 5 includes a rotating portion 521 and a connecting portion 522, the rotating portion 521 is rotatably connected to the rotating disk 2, and the connecting portion 522 is threadedly connected to the shaft roller 51. When clamping the steel wire, first rotate the fixing bolt 52 counterclockwise to move the fixing bolt 52 upward along the inner thread of the shaft roller 51 until the connecting portion 522 is separated from the shaft roller 51, and the rotating disk 2 can rotate freely. When the rotating disk 2 rotates to the required position, rotate the fixing bolt 52 clockwise to tightly connect it with the thread on the shaft roller 51, fix the relative positions of the rotating disk 2, the movable clamping plate assembly 3 and the base 1, and prevent the inaccuracy of the tensile test data due to the movement of the movable clamping assembly 3 during the stretching process. After the tensile test is completed, the fixing bolt 52 is rotated counterclockwise to release the threaded connection between the fixing bolt 52 and the shaft roller 50, so that the rotating disk 2 can resume a free rotation state.

[0048] The positioning mechanism 5 here can also use a movable latch or the like to limit the rotation of the rotating disk, so that the movable clamping plate assembly and the wire ring are tightly attached and remain stationary, stably clamping the wire and making each part of the wire evenly stressed.

[0049] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A clamping tool for a steel wire tensile testing machine, characterized in that: The invention comprises a base (1), a rotating disk (2), a movable clamping plate assembly (3), a transmission mechanism (4) for converting the rotational motion of the rotating disk (2) into radial motion of the movable clamping plate assembly (3) along the base (1), and a positioning mechanism (5) for maintaining the relative position of the rotating disk (2) and the base (1); the rotating disk (2) is mounted on the base (1); at least two groups of the movable clamping plate assembly (3) are arranged outside the base (1); the transmission mechanism (4) is arranged between the rotating disk (2) and the movable clamping plate assembly (3); and the positioning mechanism (5) is arranged between the base (1) and the rotating disk (2).

2. A clamping tool for a steel wire tensile testing machine according to claim 1, characterized in that: The transmission mechanism (4) comprises a movable column (41) and a movable hole (42). The movable holes (42) are in two groups and the two groups of movable holes (42) are opened on the upper and lower end surfaces of the rotating disk (2). The movable column (41) is connected to the movable clamping plate assembly (3), and the movable column (41) is movably connected to the movable hole (42).

3. A clamping tool for a steel wire tensile testing machine according to claim 2, characterized in that: The movable hole (42) comprises a first end hole (421), a second end hole (422) and a connecting hole (423); the first end hole (421) and the second end hole (422) are both arranged in a circular ring array around the center of the rotating disk (2); the connecting hole (423) is connected to the first end hole (421) and the second end hole (422) in an arc shape; the arcs of the connecting holes (423) have the same curvature direction; and the radius of the circular ring array of the first end holes (421) is smaller than the radius of the circular ring array of the second end holes (422).

4. The clamping fixture for a steel wire tensile testing machine according to claim 2, characterized in that: Anti-fall-off blocks (411) are respectively provided at both ends of the movable column (41).

5. The clamping tool for a steel wire tensile testing machine according to claim 1, characterized in that: The movable clamping plate assembly (3) comprises a clamping plate (31) and a shaft rod (32). One end of the shaft rod (32) is connected to the movable column (41), and the other end is fixedly connected to the clamping plate (31). An arc-shaped groove for clamping a wire ring is arranged on the outer side of the clamping plate (31).

6. The clamping fixture for a steel wire tensile testing machine according to claim 5, characterized in that: The clamping plate is provided with a limit strip (311), the base (1) is provided with a first limit slot (111), and the limit strip (311) is slidably connected to the first limit slot (111).

7. The clamping fixture for a steel wire tensile testing machine according to claim 5, characterized in that: At least three groups of the movable splint assemblies (3) are arranged outside the base (1) and surround the base (1) in a circular array.

8. The clamping fixture for a steel wire tensile testing machine according to claim 5, characterized in that: The base (1) comprises a bottom plate (11), a fixed seat (12), a rotating seat (13) and a fixed frame (14); the fixed seat (12) is arranged above the bottom plate (11); the rotating seat (13) is arranged at the center of the fixed seat (12); a second limiting groove (121) cooperating with a clamping plate (31) is arranged on the side wall of the fixed seat (12); a fixed frame (14) is installed on the outer side of the rotating seat (13); a limiting hole (141) corresponding to the shaft rod (32) is arranged on the fixed frame (14); and the shaft rod (32) passes through the limiting hole (141).

9. The clamping fixture for a steel wire tensile testing machine according to claim 1, characterized in that: A fixedly connected rotating handle (21) is provided at the top of the rotating disk (2).

10. The clamping fixture for a steel wire tensile testing machine according to claim 1, characterized in that: The positioning mechanism (5) comprises an axis roller (51) and a fixing bolt (52); one end of the axis roller (51) is fixedly connected to the base (1), and the other end is rotatably connected to the rotating disk (2); the fixing bolt (52) comprises a rotating portion (521) and a connecting portion (522); the rotating portion (521) is rotatably connected to the rotating disk (2), and the connecting portion (522) is threadedly connected to the axis roller (51).

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