A specimen positioning device and positioning method for bending test

Abstract

The present invention relates to the technical field of bending test equipment, and in particular to a sample positioning device and positioning method for bending test, which includes a base, a vertical pole, a vertical pole locking member, a first sliding sleeve, a first sliding sleeve locking member, a second sliding sleeve, a second sliding sleeve locking member, a scale, a scale locking member, a sample clamping assembly, a sample locking member and an indicator plate; the sample positioning device and positioning method of the present application can ensure that the two support rollers are accurately moved to the set position, and ensure that the bending center force application point is located on the bending center axis of the two support rollers, and at the same time, the sample clamping assembly clamps the sample to be tested, and during the bending test, the sample to be tested will not shift, so that the result of the bending test is accurate. Moreover, the indicator plate is vertically aligned with the center of the bending center of the bending tester, so that the bending center force application point is aligned with the bending force position of the sample to be tested, and the bending force position of the sample to be tested is aligned with the bending center axis of the two support rollers, so that the result of the bending test is accurate.

Description

Technical Field

[0001] The invention relates to the technical field of bending test equipment, and in particular to a sample positioning device and positioning method for a bending test. Background Art

[0002] When a traditional bending test machine performs a three-point bending test, the scale used to adjust the distance between the two support rollers is generally located on the side of the workbench of the bending test machine. When adjusting the distance between the two support rollers, there will be an operational deviation, and the distance between the two support rollers cannot be accurately adjusted, so it is difficult to ensure that the bending force point is located on the center axis of the bending center of the two support rollers, resulting in inaccurate or failed bending test results. The center axis of the bending center of the two support rollers refers to: first make a first straight line perpendicular to the center axis of the two support rollers, and then make a second straight line perpendicular to the first straight line at the midpoint of the first straight line. The second straight line is the center axis of the bending center of the two support rollers. At the same time, traditional bending test machines do not have a mechanism to fix the sample. During the bending test, the sample may shift, resulting in inaccurate or failed bending test results. Moreover, when placing the sample on the two support rollers, traditional bending test machines do not have an indication mechanism for positioning the sample, so that the bending force point cannot be accurately aligned with the bending force position of the sample, resulting in inaccurate or failed bending test results. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a sample positioning device and positioning method for a bending test, which can ensure that the two support rollers are accurately moved to the set position, thereby ensuring that the bending center force application point is located on the bending center axis of the two support rollers, so that the result of the bending test is accurate. At the same time, the sample clamping assembly clamps the sample to be tested, and during the bending test, the sample to be tested will not shift, so that the result of the bending test is accurate. Moreover, the sample positioning device of the present application is provided with an indicator plate, which is vertically aligned with the center of the bending center of the bending tester, so that the bending center force application point is aligned with the bending force position of the sample to be tested, and the bending force position of the sample to be tested is aligned with the bending center axis of the two support rollers, so that the result of the bending test is accurate.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A specimen positioning device for a bending test, comprising a base, a vertical pole, a vertical pole locking member, a first sliding sleeve, a first sliding sleeve locking member, a second sliding sleeve, a second sliding sleeve locking member, a scale, a scale locking member, a specimen clamping assembly, a specimen locking member and an indicator plate;

[0006] The base is detachably connected to a workbench of an external bending test machine, the upright pole is rotatably connected to the base, and the upright pole locking piece is used to lock the upright pole to the base; the first sliding sleeve is slidably connected to the upright pole, and the first sliding sleeve locking piece is used to lock the first sliding sleeve to the upright pole; the second sliding sleeve is rotatably connected to the first sliding sleeve, and the second sliding sleeve locking piece is used to lock the second sliding sleeve to the first sliding sleeve; the scale is slidably connected to the second sliding sleeve, and the scale locking piece is used to lock the scale to the second sliding sleeve; the sample clamping assembly is slidably connected to the scale, and the sample locking piece is used to lock the sample clamping assembly to the scale, and the sample clamping assembly is used to clamp one end of the sample to be tested; the indicator plate is connected to the scale.

[0007] Further, the sample clamping assembly includes a third sliding sleeve, a longitudinal limit plate, two transverse limit plates and two transverse limit plate locking members;

[0008] The third sleeve is slidably connected to the scale, the sample locking piece is used to lock the third sleeve to the scale, the longitudinal limit plate is connected to the third sleeve, the two transverse limit plates are slidably connected to the longitudinal limit plate, the two transverse limit plates are used to clamp one end of the sample to be tested, the longitudinal limit plate is used to contact the end face of one end of the sample to be tested clamped by the two transverse limit plates, and the two transverse limit plate locking pieces are respectively used to lock the two transverse limit plates to the longitudinal limit plate.

[0009] Furthermore, the two transverse limit plates are both provided with a U-shaped groove, in which a ball is provided, and the longitudinal limit plate is accommodated in the U-shaped groove, and the ball abuts against the longitudinal limit plate.

[0010] Furthermore, the upper surface and side surfaces of the scale are both provided with scale values.

[0011] Furthermore, the indicator plate is fixedly connected to the zero point scale position of the scale.

[0012] Furthermore, the base is provided with a support seat, the vertical pole is rotatably connected to the support seat, and the vertical pole locking piece is used to lock the vertical pole to the support seat.

[0013] Furthermore, the base includes a base body and two rotating magnets; the two rotating magnets are rotatably connected to the base body respectively, and the two rotating magnets both include a magnetic surface and a non-magnetic surface.

[0014] A method for positioning a specimen for a bending test, comprising the specimen positioning device, and further comprising the following steps:

[0015] Step 1: Connect the base to the working table of the external bending test machine;

[0016] Step 2: Drive the vertical rod to rotate relative to the base, so as to adjust the angle between the length direction of the vertical rod and the table surface of the working table of the bending test machine. After the vertical rod is adjusted, the vertical rod locking member locks the vertical rod to the base;

[0017] Step 3: driving the first sliding sleeve to slide along the length direction of the vertical pole, thereby adjusting the height of the scale. After the height adjustment of the scale is completed, the first sliding sleeve locking member locks the first sliding sleeve to the vertical pole;

[0018] Step 4: driving the second sliding sleeve to rotate relative to the first sliding sleeve, thereby adjusting the angle between the length direction of the scale and the length direction of the vertical rod. After the scale is adjusted, the second sliding sleeve locking member locks the second sliding sleeve to the first sliding sleeve;

[0019] Step 5: Drive the scale to slide along the second sliding sleeve, and the sliding scale drives the indicator plate to move. When the moving indicator plate is vertically aligned with the center of the bending center of the bending tester, the scale stops sliding, and then the scale is locked to the second sliding sleeve with the scale locking member;

[0020] Step 6: Drive the two support rollers of the external bending test machine to move to the position of the scale value corresponding to the scale, so that the indicator plate is aligned with the central axis of the bending center of the two support rollers;

[0021] Step 7: Clamp one end of the sample to be tested with the sample clamping assembly, and then drive the sample clamping assembly to slide along the scale. The sliding sample clamping assembly drives the sample to be tested clamped by the sample clamping assembly to move. After the bending force position of the sample to be tested is aligned with the indicator plate, the sample locking member locks the sample clamping assembly to the scale.

[0022] Beneficial effects of the present invention: In actual work, the base is first connected to the workbench of an external bending test machine, and then the vertical rod is driven to rotate along the connection point between the vertical rod and the base, so as to adjust the angle of the vertical rod. When the vertical rod rotates to the set position, the vertical rod is locked to the base by the vertical rod locking member. Then the first sliding sleeve is driven to slide along the vertical rod, so as to adjust the height of the scale. When the first sliding sleeve slides to the set position, the first sliding sleeve is locked to the vertical rod by the first sliding sleeve locking member. Then the second sliding sleeve is driven to rotate along the connection point between the second sliding sleeve and the first sliding sleeve, so as to adjust the angle of the scale. When the second sliding sleeve rotates to the set position, the second sliding sleeve is locked to the first sliding sleeve by the second sliding sleeve locking member.

[0023] Two supporting rollers are arranged on the working table of the bending test machine, and the two supporting rollers are slidably arranged on the working table of the bending test machine and used to carry the test sample. By adjusting the angle of the vertical pole, the height of the scale and the angle of the scale, the scale is close to the two supporting rollers, and the scale is parallel to the plane formed by the central axis of the two supporting rollers. Then the scale is driven to slide along the second sliding sleeve, and the sliding scale drives the indicator plate to move. When the moving indicator plate is vertically aligned with the center of the bending center of the bending test machine, the scale stops sliding, and the scale is locked to the second sliding sleeve with the scale locking piece. Then the two supporting rollers are moved to the position of the scale value corresponding to the scale with the indicator plate as the reference, and the two supporting rollers are locked on the working table of the bending test machine by the supporting roller locking piece. Finally, the indicator plate can accurately align with the central axis of the bending center of the two supporting rollers, ensuring that the bending center force application point is located on the central axis of the bending center of the two supporting rollers. The center axis of the bending center of the two support rollers refers to: first make a first straight line perpendicular to the center axis of the two support rollers, and then make a second straight line perpendicular to the first straight line at the midpoint of the first straight line. The second straight line is the center axis of the bending center of the two support rollers.

[0024] Then the sample clamping assembly clamps one end of the sample to be tested, measures the length of the sample to be tested clamped by the sample clamping assembly on the scale, and then drives the sample clamping assembly to slide along the scale. The sliding sample clamping assembly drives the sample to be tested clamped by the sample clamping assembly to move. When the bending stress position of the sample to be tested clamped by the sample clamping assembly is aligned with the indicator plate, that is, the bending stress position of the sample to be tested clamped by the sample clamping assembly is aligned with the central axis of the bending center of the two supporting rollers, the sample clamping assembly is locked to the scale with the sample locking piece.

[0025] The sample positioning device and positioning method of the present application can ensure that the two support rollers are accurately moved to the set position, thereby ensuring that the bending center force application point is located on the bending center axis of the two support rollers, so that the result of the bending test is accurate. At the same time, the sample clamping assembly clamps the sample to be tested, and during the bending test, the sample to be tested will not shift, so that the result of the bending test is accurate. Moreover, the sample positioning device of the present application is provided with an indicator plate, and the indicator plate is vertically aligned with the center of the bending center of the bending tester, so that the bending center force application point is aligned with the bending force position of the sample to be tested, and the bending force position of the sample to be tested is aligned with the bending center axis of the two support rollers, so that the result of the bending test is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention.

[0027] Description of reference numerals:

[0028] Base 1, upright pole 2, upright pole locking piece 3, first sliding sleeve 4, first sliding sleeve locking piece 5, second sliding sleeve 6, second sliding sleeve locking piece 7, scale 8, scale locking piece 9, sample clamping assembly 10, third sliding sleeve 101, longitudinal limit plate 102, transverse limit plate 103, transverse limit plate locking piece 104, sample locking piece 11, indicator plate 12, support seat 13, base body 14, rotating magnet 15. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0030] like Figure 1 As shown, the present invention provides a specimen positioning device for a bending test, which includes a base 1, a vertical rod 2, a vertical rod locking member 3, a first sliding sleeve 4, a first sliding sleeve locking member 5, a second sliding sleeve 6, a second sliding sleeve locking member 7, a scale 8, a scale locking member 9, a specimen clamping assembly 10, a specimen locking member 11 and an indicator plate 12;

[0031] The base 1 is detachably connected to the workbench of the bending test machine outside, the upright pole 2 is rotatably connected to the base 1, the rotation axis between the upright pole 2 and the base 1 is parallel to the table surface of the workbench of the bending test machine, and the upright pole locking member 3 is used to lock the upright pole 2 to the base 1; the first sliding sleeve 4 is slidably connected to the upright pole 2 along the length direction of the upright pole 2, and the first sliding sleeve locking member 5 is used to lock the first sliding sleeve 4 to the upright pole 2; the second sliding sleeve 6 is rotatably connected to the first sliding sleeve 4, and the space between the second sliding sleeve 6 and the first sliding sleeve 4 is The rotation axis is parallel to the rotation axis between the upright pole 2 and the base 1. The second sleeve locking member 7 is used to lock the second sleeve 6 to the first sleeve 4. The scale 8 is slidably connected to the second sleeve 6. The scale locking member 9 is used to lock the scale 8 to the second sleeve 6. The sample clamping assembly 10 is slidably connected to the scale 8. The sample locking member 11 is used to lock the sample clamping assembly 10 to the scale 8. The sample clamping assembly 10 is used to clamp one end of the sample to be tested. The indicator plate 12 is connected to the scale 8.

[0032] In actual work, the base 1 is first connected to the workbench of the external bending test machine, and then the vertical rod 2 is driven to rotate along the connection point between the vertical rod 2 and the base 1, so as to adjust the angle of the vertical rod 2. When the vertical rod 2 rotates to the set position, the vertical rod locking member 3 is used to lock the vertical rod 2 to the base 1. Then the first sliding sleeve 4 is driven to slide along the vertical rod 2, so as to adjust the height of the scale 8. When the first sliding sleeve 4 slides to the set position, the first sliding sleeve locking member 5 is used to lock the first sliding sleeve 4 to the vertical rod 2. Then the second sliding sleeve 6 is driven to rotate along the connection point between the second sliding sleeve 6 and the first sliding sleeve 4, so as to adjust the angle of the scale 8. When the second sliding sleeve 6 rotates to the set position, the second sliding sleeve locking member 7 is used to lock the second sliding sleeve 6 to the first sliding sleeve 4.

[0033] Two supporting rollers are arranged on the working table of the bending test machine, and the two supporting rollers are slidably arranged on the working table of the bending test machine and are used to carry the samples to be tested. By adjusting the angle of the vertical pole 2, the height of the scale 8 and the angle of the scale 8, the scale 8 is made close to the two supporting rollers, and the scale 8 is parallel to the plane formed by the central axes of the two supporting rollers. Then the scale 8 is driven to slide along the second sliding sleeve 6, and the sliding scale 8 drives the indicator plate 12 to move. When the moving indicator plate 12 is vertically aligned with the center of the bending center of the bending test machine, the scale 8 stops sliding, and the scale 8 is locked to the second sliding sleeve 6 by the scale locking member 9. Then the two supporting rollers are moved to the position of the scale value corresponding to the scale 8 with the indicator plate 12 as the reference, and the two supporting rollers are locked on the working table of the bending test machine by the supporting roller locking member. Finally, the indicator plate 12 can accurately align with the central axis of the bending center of the two supporting rollers, ensuring that the bending center force application point is located on the central axis of the bending center of the two supporting rollers. The center axis of the bending center of the two support rollers refers to: first make a first straight line perpendicular to the center axis of the two support rollers, and then make a second straight line perpendicular to the first straight line at the midpoint of the first straight line. The second straight line is the center axis of the bending center of the two support rollers.

[0034] Then the sample clamping assembly 10 clamps one end of the sample to be tested, and the length of the sample to be tested clamped by the sample clamping assembly 10 is measured on the scale 8. Then the sample clamping assembly 10 is driven to slide along the scale 8. The sliding sample clamping assembly 10 drives the sample to be tested clamped by the sample clamping assembly 10 to move. When the bending force position of the sample to be tested clamped by the sample clamping assembly 10 is aligned with the indicator plate 12, that is, the bending force position of the sample to be tested clamped by the sample clamping assembly 10 is aligned with the central axis of the bending center of the two supporting rollers, the sample clamping assembly 10 is locked to the scale 8 by the sample locking member 11.

[0035] The sample positioning device of the present application can ensure that the two support rollers are accurately moved to the set position, thereby ensuring that the bending center force application point is located on the bending center axis of the two support rollers, so that the result of the bending test is accurate. At the same time, the sample clamping assembly 10 clamps the sample to be tested, and during the bending test, the sample to be tested will not shift, so that the result of the bending test is accurate. Moreover, the sample positioning device of the present application is provided with an indicator plate 12, and the indicator plate 12 is vertically aligned with the center of the bending center of the bending tester, so that the bending center force application point is aligned with the bending force position of the sample to be tested, and the bending force position of the sample to be tested is aligned with the bending center axis of the two support rollers, so that the result of the bending test is accurate.

[0036] like Figure 1 As shown, in this embodiment, the sample clamping assembly 10 includes a third sleeve 101, a longitudinal limit plate 102, two transverse limit plates 103 and two transverse limit plate locking members 104; the third sleeve 101 is slidably connected to the scale 8, the sample locking member 11 is used to lock the third sleeve 101 to the scale 8, the longitudinal limit plate 102 is connected to the third sleeve 101, the two transverse limit plates 103 are both slidably connected to the longitudinal limit plate 102, the two transverse limit plates 103 are used to clamp one end of the sample to be tested, the longitudinal limit plate 102 is used to resist and block the end face of one end of the sample to be tested clamped by the two transverse limit plates 103, and the two transverse limit plate locking members 104 are respectively used to lock the two transverse limit plates 103 to the longitudinal limit plate 102.

[0037] The two transverse limit plates 103 are both provided with a U-shaped groove (not shown in the figure), and a ball bearing (not shown in the figure) is provided in the U-shaped groove. The longitudinal limit plate 102 is accommodated in the U-shaped groove, and the ball bearing abuts against the longitudinal limit plate 102 .

[0038] In actual work, the sample to be tested is first placed on two supporting rollers, and then the two transverse limiting plates 103 are driven to slide along the longitudinal limiting plate 102. Specifically, the two transverse limiting plates 103 are connected to the longitudinal limiting plate 102 via a U-shaped card slot. When the two transverse limiting plates 103 slide along the longitudinal limiting plate 102, the balls in the U-shaped card slot roll along the surface of the longitudinal limiting plate 102, so that the two transverse limiting plates 103 can slide smoothly on the longitudinal limiting plate 102. When the two transverse limiting plates 103 slide to the set position and clamp the sample to be tested placed on the two supporting rollers, the two transverse limiting plate locking members 104 lock the two transverse limiting plates 103 to the longitudinal limiting plate 102 respectively. Then, the length of the sample to be tested clamped by the two transverse limit plates 103 is measured on the scale 8, and then the third sleeve 101 is driven to slide along the scale 8. The sliding third sleeve 101 drives the longitudinal limit plate 102, the two transverse limit plates 103 and the sample to be tested clamped by the two transverse limit plates 103 to move together. When the bending force position of the sample to be tested clamped by the two transverse limit plates 103 is aligned with the indicator plate 12, that is, the bending force position of the sample to be tested clamped by the two transverse limit plates 103 is aligned with the central axis of the bending center of the two support rollers, the third sleeve 101 is locked to the scale 8 with the sample locking member 11. The design of the sample clamping assembly 10 is reasonable and can clamp the sample to be tested. During the bending test, the sample to be tested will not be displaced, so that the result of the bending test is accurate.

[0039] like Figure 1 As shown, in this embodiment, the upper surface and the side surface of the scale 8 are provided with scale values, which is convenient for the operator to adjust the test sample and the two supporting rollers to the set position.

[0040] like Figure 1 As shown, in this embodiment, the indicator plate 12 is fixedly connected to the zero point scale position of the scale 8, so that the operator can find the central axis of the bending center of the two supporting rollers and the bending force position of the sample to be tested.

[0041] like Figure 1 As shown, in this embodiment, the base 1 is provided with a support seat 13, the upright pole 2 is rotatably connected to the support seat 13, and the upright pole locking member 3 is used to lock the upright pole 2 to the support seat 13. In actual work, the support seat 13 is welded to the base 1, and the upright pole 2 can rotate relative to the support seat 13, so as to adjust the angle between the length direction of the upright pole 2 and the table surface of the working table of the bending test machine. When the upright pole 2 rotates to the set position, the upright pole locking member 3 locks the upright pole 2 to the support seat 13. The base 1 is provided with a support seat 13 to provide a connection foundation for the upright pole 2.

[0042] like Figure 1As shown, in this embodiment, the base 1 includes a base body 14 and two rotating magnets 15; the two rotating magnets 15 are rotatably connected to the base body 14 respectively, and the two rotating magnets 15 both include a magnetic surface and a non-magnetic surface.

[0043] In actual work, by rotating the two rotating magnets 15 so that the magnetic surface or the non-magnetic surface faces the workbench of the bending test machine outside, when the magnetic surfaces of the two rotating magnets 15 face the workbench of the bending test machine outside, the two rotating magnets 15 absorb the workbench of the bending test machine outside and fix the base body 14 to the workbench of the bending test machine outside. When the non-magnetic surfaces of the two rotating magnets 15 face the workbench of the bending test machine outside, the base body 14 can be removed from the workbench of the bending test machine outside, which facilitates the fixing and removal of the base 1.

[0044] like Figure 1 As shown, the present invention provides a sample positioning method for a bending test, which includes the sample positioning device described above, and further includes the following steps:

[0045] Step 1: Connect the base 1 to the working table of an external bending test machine;

[0046] Step 2: driving the vertical rod 2 to rotate relative to the base 1, so as to adjust the angle between the length direction of the vertical rod 2 and the table surface of the working table of the bending test machine. After the vertical rod 2 is adjusted, the vertical rod locking member 3 locks the vertical rod 2 to the base 1;

[0047] Step 3: driving the first sliding sleeve 4 to slide along the length direction of the vertical pole 2, so as to adjust the height of the scale 8. After the height adjustment of the scale 8 is completed, the first sliding sleeve locking member 5 locks the first sliding sleeve 4 to the vertical pole 2;

[0048] Step 4: driving the second sliding sleeve 6 to rotate relative to the first sliding sleeve 4, so as to adjust the angle between the length direction of the scale 8 and the length direction of the vertical rod 2. After the adjustment of the scale 8 is completed, the second sliding sleeve locking member 7 locks the second sliding sleeve 6 to the first sliding sleeve 4;

[0049] Step 5: Drive the scale 8 to slide along the second sliding sleeve 6, and the sliding scale 8 drives the indicator plate 12 to move. When the moving indicator plate 12 is vertically aligned with the center of the bending center of the bending tester, the scale 8 stops sliding, and then the scale locking member 9 is used to lock the scale 8 to the second sliding sleeve 6;

[0050] Step 6: Drive the two support rollers of the external bending test machine to move to the position of the scale value corresponding to the scale 8, so that the indicator plate 12 is aligned with the central axis of the bending center of the two support rollers;

[0051] Step 7: Clamp one end of the sample to be tested with the sample clamping assembly 10, and then drive the sample clamping assembly 10 to slide along the scale 8. The sliding sample clamping assembly 10 drives the sample to be tested clamped by the sample clamping assembly 10 to move. After the bending force position of the sample to be tested is aligned with the indicator plate 12, the sample locking member 11 locks the sample clamping assembly 10 to the scale 8.

[0052] In actual work, the base 1 is first connected to the workbench of the external bending test machine, and then the vertical rod 2 is driven to rotate relative to the base 1 to adjust the angle of the vertical rod 2. When the vertical rod 2 rotates to the set position, the vertical rod locking member 3 is used to lock the vertical rod 2 to the base 1. Then the first sliding sleeve 4 is driven to slide along the vertical rod 2 to adjust the height of the scale 8. When the first sliding sleeve 4 slides to the set position, the first sliding sleeve locking member 5 is used to lock the first sliding sleeve 4 to the vertical rod 2. Then the second sliding sleeve 6 is driven to rotate relative to the first sliding sleeve 4 to adjust the angle of the scale 8. When the second sliding sleeve 6 rotates to the set position, the second sliding sleeve locking member 7 is used to lock the second sliding sleeve 6 to the first sliding sleeve 4.

[0053] Two supporting rollers are arranged on the working table of the bending test machine, and the two supporting rollers are slidably arranged on the working table of the bending test machine and are used to carry the samples to be tested. By adjusting the angle of the vertical pole 2, the height of the scale 8 and the angle of the scale 8, the scale 8 is made close to the two supporting rollers, and the scale 8 is parallel to the plane formed by the central axes of the two supporting rollers. Then the scale 8 is driven to slide along the second sliding sleeve 6, and the sliding scale 8 drives the indicator plate 12 to move. When the moving indicator plate 12 is vertically aligned with the center of the bending center of the bending test machine, the scale 8 stops sliding, and the scale 8 is locked to the second sliding sleeve 6 by the scale locking member 9. Then the two supporting rollers are moved to the position of the scale value corresponding to the scale 8 with the indicator plate 12 as the reference, and the two supporting rollers are locked on the working table of the bending test machine by the supporting roller locking member. Finally, the indicator plate 12 can accurately align with the central axis of the bending center of the two supporting rollers, ensuring that the bending center force application point is located on the central axis of the bending center of the two supporting rollers. The center axis of the bending center of the two support rollers refers to: first make a first straight line perpendicular to the center axis of the two support rollers, and then make a second straight line perpendicular to the first straight line at the midpoint of the first straight line. The second straight line is the center axis of the bending center of the two support rollers.

[0054] Then the sample clamping assembly 10 clamps one end of the sample to be tested, and the length of the sample to be tested clamped by the sample clamping assembly 10 is measured on the scale 8. Then the sample clamping assembly 10 is driven to slide along the scale 8. The sliding sample clamping assembly 10 drives the sample to be tested clamped by the sample clamping assembly 10 to move. When the bending force position of the sample to be tested clamped by the sample clamping assembly 10 is aligned with the indicator plate 12, that is, the bending force position of the sample to be tested clamped by the sample clamping assembly 10 is aligned with the central axis of the bending center of the two supporting rollers, the sample clamping assembly 10 is locked to the scale 8 by the sample locking member 11.

[0055] The sample positioning device and positioning method of the present application can ensure that the two support rollers are accurately moved to the set position, thereby ensuring that the bending center force application point is located on the bending center axis of the two support rollers, so that the result of the bending test is accurate. At the same time, the sample clamping assembly 10 clamps the sample to be tested, and during the bending test, the sample to be tested will not shift, so that the result of the bending test is accurate. Moreover, the sample positioning device of the present application is provided with an indicator plate 12, and the indicator plate 12 is vertically aligned with the center of the bending center of the bending tester, so that the bending center force application point is aligned with the bending force position of the sample to be tested, and the bending force position of the sample to be tested is aligned with the bending center axis of the two support rollers, so that the result of the bending test is accurate.

[0056] All technical features in this embodiment can be freely combined according to actual needs.

[0057] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A specimen positioning device for a bending test, characterized in that: It includes a base, a vertical pole, a vertical pole locking piece, a first sliding sleeve, a first sliding sleeve locking piece, a second sliding sleeve, a second sliding sleeve locking piece, a scale, a scale locking piece, a sample clamping assembly, a sample locking piece and an indicator plate; The base is detachably connected to a workbench of an external bending test machine, the upright pole is rotatably connected to the base, and the upright pole locking piece is used to lock the upright pole to the base; the first sliding sleeve is slidably connected to the upright pole, and the first sliding sleeve locking piece is used to lock the first sliding sleeve to the upright pole; the second sliding sleeve is rotatably connected to the first sliding sleeve, and the second sliding sleeve locking piece is used to lock the second sliding sleeve to the first sliding sleeve; the scale is slidably connected to the second sliding sleeve, and the scale locking piece is used to lock the scale to the second sliding sleeve; the sample clamping assembly is slidably connected to the scale, and the sample locking piece is used to lock the sample clamping assembly to the scale, and the sample clamping assembly is used to clamp one end of the sample to be tested; the indicator plate is connected to the scale; the upper surface and side surfaces of the scale are provided with scale values; the indicator plate is fixedly connected to the zero scale position of the scale.

2. A specimen positioning device for bending test according to claim 1, characterized in that: The sample clamping assembly comprises a third sliding sleeve, a longitudinal limit plate, two transverse limit plates and two transverse limit plate locking members; The third sleeve is slidably connected to the scale, the sample locking piece is used to lock the third sleeve to the scale, the longitudinal limit plate is connected to the third sleeve, the two transverse limit plates are slidably connected to the longitudinal limit plate, the two transverse limit plates are used to clamp one end of the sample to be tested, the longitudinal limit plate is used to contact the end face of one end of the sample to be tested clamped by the two transverse limit plates, and the two transverse limit plate locking pieces are respectively used to lock the two transverse limit plates to the longitudinal limit plate.

3. A specimen positioning device for bending test according to claim 2, characterized in that: The two transverse limit plates are both provided with U-shaped slots, in which balls are arranged, and the longitudinal limit plates are accommodated in the U-shaped slots, and the balls abut against the longitudinal limit plates.

4. A specimen positioning device for bending test according to claim 1, characterized in that: The base is provided with a support seat, the vertical rod is rotatably connected to the support seat, and the vertical rod locking piece is used to lock the vertical rod to the support seat.

5. A specimen positioning device for bending test according to claim 1, characterized in that: The base comprises a base body and two rotating magnets; the two rotating magnets are rotatably connected to the base body respectively, and the two rotating magnets both comprise a magnetic surface and a non-magnetic surface.

6. A method for positioning a specimen for a bending test, characterized in that: The sample positioning device according to claim 1 further comprises the following steps: Step 1: Connect the base to the working table of the external bending test machine; Step 2: Drive the vertical rod to rotate relative to the base, so as to adjust the angle between the length direction of the vertical rod and the table surface of the working table of the bending test machine. After the vertical rod is adjusted, the vertical rod locking member locks the vertical rod to the base; Step 3: driving the first sliding sleeve to slide along the length direction of the vertical pole, thereby adjusting the height of the scale. After the height adjustment of the scale is completed, the first sliding sleeve locking member locks the first sliding sleeve to the vertical pole; Step 4: driving the second sliding sleeve to rotate relative to the first sliding sleeve, thereby adjusting the angle between the length direction of the scale and the length direction of the vertical rod. After the scale is adjusted, the second sliding sleeve locking member locks the second sliding sleeve to the first sliding sleeve; Step 5: Drive the scale to slide along the second sliding sleeve, and the sliding scale drives the indicator plate to move. When the moving indicator plate is vertically aligned with the center of the bending center of the bending tester, the scale stops sliding, and then the scale is locked to the second sliding sleeve with the scale locking member; Step 6: Drive the two supporting rollers of the external bending test machine to move to the position of the scale value corresponding to the scale, so that the indicator plate is aligned with the central axis of the bending center of the two supporting rollers; Step 7: Clamp one end of the sample to be tested with the sample clamping assembly, and then drive the sample clamping assembly to slide along the scale. The sliding sample clamping assembly drives the sample to be tested clamped by the sample clamping assembly to move. After the bending force position of the sample to be tested is aligned with the indicator plate, the sample locking member locks the sample clamping assembly to the scale.

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