Tightening device, testing machine and winding and unwinding method for testing tensile property of wire

Abstract

The invention relates to the technical field of wire tensile property testing, in particular to a tightening device, a testing machine and a take-up and pay-off method for testing the tensile property of a wire. Comprising a spindle wound with a to-be-measured wire; the disc has a first state driven to rotate around the central axis of the disc and a second state not driven. The end opening of a to-be-measured wire wound on the spindle extends into the tightening space, the tightening teeth penetrate into the to-be-measured wire through rotation of the disc, then the to-be-measured wire is internally fixed to the disc, and the to-be-measured wire between the spindle and the disc can be tightened by rotating the disc.

Description

Technical Field

[0001] The invention relates to the technical field of wire tensile performance testing, and in particular to a tightening device, a testing machine and a tightening and releasing method for testing the tensile performance of a wire. Background Art

[0002] Generally, the tensile properties of wires are tested by using a universal testing machine in conjunction with a fixture, such as testing the tensile properties of flat wires. During the test, the wires need to be tightened and fixed on the fixture, but when tightening the wires, the tester generally needs to tighten the wires manually, wasting human resources. Summary of the invention

[0003] In view of this, the present invention provides a tightening device, a testing machine and a retracting method for testing the tensile performance of a wire material, so as to solve the problem of wasting human resources when tightening the wire material.

[0004] In a first aspect, the present invention provides a tightening device for testing the tensile properties of a wire material, comprising: a spindle, wound with the wire to be tested; a disk having a first state in which it is driven to rotate about its central axis and a second state in which it is not driven; A tightening guide rail, the tightening guide rail is located outside the disc and has a first gap with the disc, the first gap forms a tightening space, the tightening space has an inlet and an outlet, and when the disc is in a first state, the rotation direction of the disc is an extension direction from the inlet of the tightening space to the outlet of the tightening space; The tightening teeth are arranged on the outer side of the disc and between the disc and the tightening guide rail. When the wire to be tested extends into the tightening space, the disc rotates to make the tightening teeth penetrate into the wire to be tested.

[0005] The end of the wire to be tested wound on the spindle is extended into the tightening space. The rotation of the disc causes the tightening teeth to penetrate into the wire to be tested, thereby fixing the wire to be tested on the disc. The wire to be tested between the spindle and the disc can be tightened by rotating the disc.

[0006] In an optional embodiment, the first gap gradually decreases from the tightening space entrance position to the tightening space first position; The tightening space first position is located between the tightening space inlet and the tightening space outlet.

[0007] The penetration degree of the tightening teeth into the wire to be tested can be gradually increased to ensure that the wire to be tested is fixed on the disc.

[0008] In an optional implementation, it also includes: A spring sheet is arranged on the outer side of the disc and between the disc and the tightening guide rail, and the tightening teeth are arranged on the spring sheet.

[0009] In an optional embodiment, the spring sheet is obliquely arranged on the disk, and in the rotation direction of the disk, the angle between the tangent line at the connection between the disk and the spring sheet and the spring sheet is an acute angle.

[0010] In an optional embodiment, when the spring sheet is located in the tightening space, the tightening tooth is located between the spring sheet and the tightening guide rail.

[0011] In an optional embodiment, when the spring sheet is located at the second position of the tightening space, the tightening teeth abut against the wire to be tested; The tightening space second position is located between the tightening space entrance position and the tightening space first position.

[0012] The tightening teeth can be ensured to penetrate into the wire to be tested between the second position of the tightening space and the first position of the tightening space.

[0013] In an optional implementation, it also includes: There are two protective plates, which are arranged on the tightening guide rail along the extension direction of the central axis of the disc, and the tightening space is located between the two protective plates.

[0014] The protection plate can prevent the wire to be tested from moving in the tightening space along the extension direction of the central axis of the disk and then rushing out of the tightening space.

[0015] In an optional implementation, it also includes: There are two rollers, a second gap is formed between the two rollers, and the second gap is located directly above the entrance of the tightening space, and the port of the wire material to be tested on the spindle is clamped in the gap between the two rollers; A turning roller, on which the wire to be tested on the spindle is wound and extends to the gap between the two rollers; The roller has a third state in which it is driven to rotate around its central axis and a fourth state in which it is not driven. When the roller is in the third state, the two rollers transport the wire to be tested to the tightening space.

[0016] In a second aspect, the present invention further provides a testing machine for testing the tensile properties of a wire material, comprising: A tightening device as described above; A bracket, wherein an upper clamp and a lower clamp are arranged on the bracket, and the upper clamp and the lower clamp are located between the second gap and the tightening space entrance; The upper clamp and the lower clamp are suitable for fixing the wire to be tested on the bracket, wherein when the upper clamp and the lower clamp are in an open state, the wire to be tested passes through the upper clamp and the lower clamp respectively into the tightening space under the drive of the two rollers.

[0017] In a third aspect, the present invention further provides a method for testing the tensile properties of a wire material, which is used in the above-mentioned testing machine and comprises the following steps: Open the upper clamp and the lower clamp, drive the roller to be in the third state, and the wire to be tested passes through the upper clamp and the lower clamp respectively into the tightening space; The disc is driven to be in a first state, and after the wire to be tested is wound around the disc for several turns, the disc is placed in a second state, and the roller is placed in a fourth state; Close the upper and lower clamps, cut the wire to be tested between the upper clamp and the roller, and perform a tensile performance test on the wire; After the test is completed, the upper and lower clamps are opened, the disc is driven in reverse, and the wire to be tested wound on the disc is pulled out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the rotation direction of the disc in an embodiment of the present invention; Figure 3 This is a schematic diagram of the position of the protective plate according to an embodiment of the present invention; Figure 4 The figure is a flow chart of an embodiment of the present invention.

[0020] Description of reference numerals: 1. Spindle; 2. Disc; 3. Tightening rail; 4. Tightening teeth; 5. Spring sheet; 6. Protective plate; 7. Roller; 8. Steering roller; 9. Bracket; 10. Upper clamp; 11. Lower clamp. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] Combine the following Figures 1 to 4 , describing the embodiments of the present invention. In the present invention, the wire material to be tested can be SrPP flat wire material, wherein SrPP is a polypropylene self-reinforced composite material, which is composed of highly oriented PP fiber reinforced PP resin, with a density of only 0.92g / cm³, and a significant lightweight effect. At the same time, it has excellent impact resistance, especially low temperature (-40℃) impact resistance. In addition, SrPP does not contain glass fiber or carbon fiber, and is a 100% recyclable green and environmentally friendly material.

[0023] The flat yarn is obtained by ABA sandwich structure: the core layer is homopolymer polypropylene to provide strength; the skin layer is copolymer polypropylene, and the core layer is arranged between the two skin layers.

[0024] In a first aspect, the present invention provides a tightening device for testing the tensile properties of a wire material, comprising: Spindle 1, wound with the wire to be tested; The disk 2 has a first state in which it is driven to rotate around its central axis and a second state in which it is not driven, wherein the disk 2 can be driven directly by the motor or by the motor and the reducer; a tightening guide rail 3, wherein the tightening guide rail 3 is located outside the disc 2 and has a first gap with the disc 2, wherein the first gap forms a tightening space, wherein the tightening space has an inlet and an outlet, and when the disc 2 is in a first state, the rotation direction of the disc 2 is an extension direction from the inlet of the tightening space to the outlet of the tightening space; The tightening teeth 4 are arranged outside the disc 2 and between the disc 2 and the tightening guide rail 3, with the tooth tips facing the tightening guide rail 3. When the wire to be tested extends into the tightening space, the disc 2 rotates to allow the tightening teeth 4 to penetrate into the wire to be tested. In order to allow the rotating disc 2 to allow the tightening teeth 4 to penetrate into the wire to be tested, the gap between the tooth tips of the tightening teeth 4 and the tightening guide rail 3 can be designed to be smaller than the thickness of the wire to be tested.

[0025] The end of the wire to be tested wound on the spindle 1 is extended into the tightening space, and the rotation of the disc 2 causes the tightening teeth 4 to penetrate into the wire to be tested, and then the wire to be tested is fixed on the disc 2, and the wire to be tested between the spindle 1 and the disc 2 can be tightened by rotating the disc 2. During the tightening process, at most manpower is required to extend the end of the wire to be tested into the tightening space, and no more manpower is required after the tightening teeth 4 penetrate into the wire to be tested, which reduces the waste of manpower compared to the prior art.

[0026] In an optional embodiment, the first gap gradually becomes smaller from the entrance position of the tightening space to the first position of the tightening space, and the size of the tightening space entrance is relatively large, so that the wire to be tested can enter the tightening space along the entrance; that is, from the entrance position of the tightening space to the first position of the tightening space, the first gap is gradual, and the first gap at the entrance position of the tightening space is larger than the first gap at the first position of the tightening space.

[0027] The first tightening space position is located between the tightening space inlet and the tightening space outlet. Optionally, the first tightening space position may also be the tightening space outlet position.

[0028] The penetration degree of the tightening teeth 4 into the wire to be tested can be gradually increased to ensure that the wire to be tested is fixed on the disc 2.

[0029] In an optional implementation, it also includes: The spring sheet 5 is arranged on the outer side of the disc 2 and between the disc 2 and the tightening guide rail 3 , and the tightening teeth 4 are arranged on the spring sheet 5 .

[0030] In an optional embodiment, the spring sheet 5 is obliquely arranged on the disk 2, and in the rotation direction of the disk 2, the angle between the tangent line at the connection between the disk 2 and the spring sheet 5 and the spring sheet 5 is an acute angle.

[0031] In an optional implementation, when the spring sheet 5 is located in the tightening space, the tightening tooth 4 is located between the spring sheet 5 and the tightening guide rail 3 .

[0032] In an optional embodiment, when the spring sheet 5 is located in the second position of the tightening space, the tightening teeth 4 abut against the wire to be tested, and the spring sheet 5 can prevent a rigid collision between the tightening teeth 4 and the tightening guide rail 3. From the second position of the tightening space to the first position of the tightening space, the spring sheet 5 is gradually compressed in the direction of the disc 2, and the degree to which the tightening teeth 4 penetrate into the wire to be tested continues to increase. In addition, the spring sheet 5 has good fatigue resistance and toughness, so the spring sheet 5 can change accordingly after the first gap narrows. After a test is completed, the wire to be tested is removed, and the spring sheet 5 can also be restored to its original shape.

[0033] The tightening space second position is located between the tightening space entrance position and the tightening space first position.

[0034] The tightening teeth 4 can be ensured to penetrate into the wire to be tested between the second tightening space position and the first tightening space position.

[0035] In an optional implementation, it also includes: There are two protective plates 6 , which are arranged on the tightening guide rail 3 along the extension direction of the central axis of the disc 2 , and the tightening space is located between the two protective plates 6 .

[0036] The protection plate 6 can prevent the wire to be tested from moving in the extension direction of the central axis of the disk 2 in the tightening space and then rushing out of the tightening space, thus playing a guiding role.

[0037] In an optional implementation, it also includes: There are two rollers 7, with a second gap between the two rollers 7 and the second gap is located just above the entrance of the tightening space, and the port of the wire to be tested on the spindle 1 is clamped in the gap between the two rollers 7; wherein the roller 7 can be directly driven by a motor, or the disc 2 can be driven by a motor and a reducer. There is friction between the roller 7 and the wire to be tested, and the friction can be increased by setting textures on the surface of the roller 7 or frosting it.

[0038] Steering roller 8, the wire to be tested on the spindle 1 is wound around the steering roller 8 and extends to the gap between the two rollers 7; the winding manner of the wire on the spindle 1 is an eight-shaped shape, so directly clamping the wire to be tested on the spindle 1 in the gap between the two rollers 7 will have an axial displacement difference, and the steering roller 8 can adjust the direction of the wire.

[0039] The rollers 7 have a third state in which they are driven to rotate around their central axis and a fourth state in which they are not driven. When the rollers 7 are in the third state, the two rollers 7 transport the wire to be tested to the tightening space.

[0040] A controller may also be included to control the driving of the disc 2 and the roller 7 .

[0041] In a second aspect, the present invention further provides a testing machine for testing the tensile properties of a wire material, comprising: A tightening device as described above; A bracket 9, wherein an upper clamp 10 and a lower clamp 11 are disposed on the bracket 9, and the upper clamp 10 and the lower clamp 11 are located between the second gap and the tightening space entrance; The upper clamp 10 and the lower clamp 11 are suitable for fixing the wire to be tested on the bracket 9, wherein, when the upper clamp 10 and the lower clamp 11 are in the open state, the wire to be tested passes through the upper clamp 10 and the lower clamp 11 respectively to the tightening space under the drive of the two rollers 7. The upper clamp 10 and the lower clamp 11 may each include an adjusting screw and two clamps, the adjusting screw is rotatably arranged on one clamp and passes through the other clamp, and is screwed with the other clamp to adjust the distance between the two clamps. When the wire to be tested passes through the upper clamp 10 and the lower clamp 11 respectively, the wire to be tested is located between the two clamps.

[0042] In addition, the testing machine can also include testing components such as tensile testing machines.

[0043] In a third aspect, the present invention further provides a method for testing the tensile properties of a wire material, which is used in the above-mentioned testing machine and comprises the following steps: Open the upper clamp 10 and the lower clamp 11, drive the roller 7 to be in the third state, and the wire to be tested passes through the upper clamp 10 and the lower clamp 11 respectively into the tightening space; The disc 2 is driven to be in the first state. After the wire to be tested is wound around the disc 2 for several turns, the disc 2 is put into the second state, and the roller 7 is put into the fourth state. Generally speaking, the wire to be tested is wound around the disc 2 for one turn to meet the requirements. Close the upper clamp 10 and the lower clamp 11, cut the wire to be tested between the upper clamp 10 and the roller 7, and perform a tensile performance test on the wire; After the test is completed, the upper clamp 10 and the lower clamp 11 are opened, the disc 2 is driven in the reverse direction, and the wire material to be tested wound on the disc 2 is pulled out.

[0044] Among them, in the prior art, the wire is first passed through the upper clamp by hand, and then the handle is rotated to clamp the wire. After clamping, the wire is wound around the upper fixing pin set below the upper clamp. Then the wire is pulled down and wound around the lower fixing pin set in the lower clamp. Finally, the wound wire is inserted into the lower clamp, and the handle is rotated to clamp the wire after tightening. The distance between the crossbeam and the upper clamp is adjusted until the wire is taut and then the test is started, wherein the crossbeam is connected to the lower clamp. Problems with the prior art: manual operation by one person during the wire clamping process may result in loose wire clamping, causing the sample to slip, affecting the measurement accuracy of the tensile test; if the wire clamping is not firm, the machine needs to be adjusted manually, the accuracy is difficult to control, and it wastes time.

[0045] The present application ultimately tightens the wire by using the disc 2 in the second state and the roller 7 in the fourth state, basically realizing a semi-automatic mode, reducing errors and time loss caused by human operation, and can tighten, fix, and straighten the wire, reducing the possibility of sample slippage, and facilitating measurement tests.

[0046] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A tightening device for testing the tensile properties of a wire, characterized in that: include: A spindle (1) wound with a wire material to be tested; The disk (2) has a first state in which it is driven to rotate about its central axis and a second state in which it is not driven; a tightening guide rail (3), the tightening guide rail (3) being located outside the disc (2) and having a first gap between the tightening guide rail and the disc (2), the first gap forming a tightening space, the tightening space having an inlet and an outlet, and when the disc (2) is in a first state, the rotation direction of the disc (2) is an extension direction from the inlet of the tightening space to the outlet of the tightening space; The tightening teeth (4) are arranged on the outside of the disc (2) and between the disc (2) and the tightening guide rail (3). When the wire to be tested extends into the tightening space, the disc (2) rotates so that the tightening teeth (4) penetrate into the wire to be tested.

2. The tightening device for testing the tensile properties of a wire material according to claim 1, characterized in that: From the entrance position of the tightening space to the first position of the tightening space, the first gap gradually becomes smaller; The tightening space first position is located between the tightening space inlet and the tightening space outlet.

3. The tightening device for testing the tensile properties of a wire material according to claim 2, characterized in that: Also includes: A spring sheet (5) is arranged on the outside of the disc (2) and between the disc (2) and the tightening guide rail (3); and the tightening teeth (4) are arranged on the spring sheet (5).

4. The tightening device for testing the tensile properties of a wire material according to claim 3, characterized in that: The spring sheet (5) is arranged obliquely on the disc (2); in the rotation direction of the disc (2), the angle between the tangent line at the connection between the disc (2) and the spring sheet (5) and the spring sheet (5) is an acute angle.

5. The tightening device for testing the tensile properties of a wire material according to claim 3, characterized in that: When the spring sheet (5) is located in the tightening space, the tightening teeth (4) are located between the spring sheet (5) and the tightening guide rail (3).

6. The tightening device for testing the tensile properties of a wire material according to claim 3, characterized in that: When the spring sheet (5) is located at the second position of the tightening space, the tightening teeth (4) abut against the wire to be tested; The tightening space second position is located between the tightening space entrance position and the tightening space first position.

7. The tightening device for testing the tensile properties of a wire material according to claim 1, characterized in that: Also includes: There are two protective plates (6) which are arranged on the tightening guide rail (3) along the extension direction of the central axis of the disc (2); the tightening space is located between the two protective plates (6).

8. The tightening device for testing the tensile properties of a wire material according to claim 1, characterized in that: Also includes: There are two rollers (7), a second gap is provided between the two rollers (7), and the second gap is located directly above the entrance of the tightening space, and the end of the wire material to be tested on the spindle (1) is clamped in the gap between the two rollers (7); A turning roller (8), the wire material to be tested on the spindle (1) is wound around the turning roller (8) and extends to the gap between the two rollers (7); The rollers (7) have a third state in which they are driven to rotate around their central axes and a fourth state in which they are not driven. When the rollers (7) are in the third state, the two rollers (7) transport the wire material to be tested to the tightening space.

9. A testing machine for testing the tensile properties of a wire, characterized in that: include: The tightening device according to any one of claims 1 to 8; A bracket (9), wherein an upper clamp (10) and a lower clamp (11) are provided on the bracket (9), and the upper clamp (10) and the lower clamp (11) are located between the second gap and the entrance of the tightening space; The upper clamp (10) and the lower clamp (11) are suitable for fixing the wire to be tested on the bracket (9), wherein when the upper clamp (10) and the lower clamp (11) are in an open state, the wire to be tested is driven by the two rollers (7) to pass through the upper clamp (10) and the lower clamp (11) to the tightening space.

10. A method for testing the tensile properties of a wire, used in the testing machine as claimed in claim 9, characterized in that: The following steps are involved: Opening the upper clamp (10) and the lower clamp (11), driving the roller (7) to be in the third state, and allowing the wire to be tested to pass through the upper clamp (10) and the lower clamp (11) respectively into the tightening space; The disc (2) is driven to be in a first state, and after the wire to be tested is wound around the disc (2) for a number of turns, the disc (2) is placed in a second state, and the roller (7) is placed in a fourth state; The upper clamp (10) and the lower clamp (11) are closed, and the wire to be tested is cut between the upper clamp (10) and the roller (7) to perform a tensile property test on the wire; After the test is completed, the upper clamp (10) and the lower clamp (11) are opened, the disc (2) is driven in the reverse direction, and the wire material to be tested wound on the disc (2) is pulled out.

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