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CN-224216431-U - Sample symmetry line marking device

CN224216431UCN 224216431 UCN224216431 UCN 224216431UCN-224216431-U

Abstract

The utility model belongs to the technical field of mechanical property testing of materials, and discloses a sample symmetry line marking device which comprises an adjusting component, a scribing component and a locating pin, wherein in the device, a first clamping piece and a second clamping piece are symmetrically arranged by taking the groove bottom in the middle of a screw rod as a center, and the spiral directions of a first external thread and a second external thread are opposite, so that the first clamping piece and the second clamping piece can slide along the axial direction of the screw rod at the same distance relatively or oppositely, and the locating pin passes through a scribing pen locating piece and is inserted into the groove, thereby realizing the locating of the scribing pen locating piece in the length direction of the screw rod, ensuring the locating of the scribing pen in the length direction of the screw rod, and ensuring that the scribing pen locating piece is always positioned on the symmetry line of the first clamping piece and the second clamping piece in the whole adjusting and symmetrical line drawing process, further keeping the moving direction of the scribing pen unchanged, and greatly improving the drawing efficiency and accuracy of the sample symmetry line.

Inventors

  • ZENG JINGSHAN
  • Pan Lingfei
  • ZHANG LIPENG
  • SUN XINMING
  • LIU YANYAN
  • SUN ZONGQIAN

Assignees

  • 上海飞机制造有限公司

Dates

Publication Date
20260508
Application Date
20250407

Claims (10)

  1. 1. A sample symmetry line marking device, comprising: The adjusting assembly comprises a screw (11), a first clamping piece (12) and a second clamping piece (13), grooves (111) are formed in the middle of the screw (11) along the circumferential direction of the screw in the axial direction of the screw (11), first external threads and second external threads opposite in spiral direction are formed in the screw (11) at intervals, first internal threads are formed in the first clamping piece (12), second internal threads are formed in the second clamping piece (13), the first external threads are in threaded fit with the first internal threads, the second external threads are in threaded fit with the second internal threads, the first clamping piece (12) and the second clamping piece (13) are symmetrically arranged about the middle of the screw (11), and a sample (5) can be clamped between the first clamping piece (12) and the second clamping piece (13); The scribing assembly comprises a scribing pen (21) and a scribing pen positioning piece (22), the scribing pen positioning piece (22) is rotationally connected with the screw (11), the scribing pen (21) is connected with the scribing pen positioning piece (22), a pen point of the scribing pen (21) faces to the surface of the sample (5), and the scribing pen (21) can reciprocate along the direction perpendicular to the axial direction of the screw (11); and the locating pin (3) penetrates through the scribing pen locating piece (22) and is inserted into the groove (111), and the side surface of the locating pin (3) is attached to the groove wall of the groove (111).
  2. 2. The sample symmetry line marking device according to claim 1, wherein the groove (111) is an annular groove.
  3. 3. The sample symmetry line marking device according to claim 1, wherein the marker positioning member (22) is provided with a connecting portion (221), the connecting portion (221) is provided with a through hole, and the screw (11) is rotatably disposed through the through hole.
  4. 4. The marking device for symmetrical lines of samples according to claim 3, wherein the marking pen positioning member (22) is further provided with a guiding portion (222), the guiding portion (222) is fixedly connected with the connecting portion (221), a chute (223) is formed in the guiding portion (222), the side surface of the marking pen (21) is slidably attached to the wall of the chute (223) along the width direction of the chute (223), the length direction of the chute (223) is perpendicular to the axial direction of the screw (11), and the marking pen (21) is movably arranged in the chute (223) in a penetrating manner and can reciprocate along the length direction of the chute (223).
  5. 5. The sample symmetry line marking device according to claim 1, further comprising a holder (4), wherein the first clamping member (12) and the second clamping member (13) are connected to the holder (4).
  6. 6. The sample symmetry line marking device according to claim 5, wherein the fixing base (4) is provided with a through groove (41), the first clamping piece (12) is provided with a first protruding portion, the second clamping piece (13) is provided with a second protruding portion, the length direction of the through groove (41) is parallel to the axial direction of the screw (11), and the first protruding portion and the second protruding portion are both slidably arranged in the through groove (41).
  7. 7. The apparatus according to claim 6, wherein the width of the opening of the through groove (41) is smallest in the depth direction of the through groove (41).
  8. 8. The sample symmetry line marking device according to claim 1, wherein the adjustment assembly further comprises a grip (14), one end of the grip (14) being fixedly connected with one end of the screw (11).
  9. 9. The device according to claim 8, wherein the number of gripping members (14) is at least two, and at least two gripping members (14) are distributed around the screw (11).
  10. 10. The sample symmetry line marking device according to any of the claims 1-9, further comprising a stop member, which stop member is fixed to an end of the first external thread facing away from the second external thread and/or to an end of the second external thread facing away from the first external thread in the axial direction of the screw (11).

Description

Sample symmetry line marking device Technical Field The utility model relates to the technical field of mechanical property testing of materials, in particular to a sample symmetry line marking device. Background The tensile test is a special method for measuring the mechanical properties of metal materials by an electronic universal tester, and according to test standards of ASTM E8/E8M, GB/T228.1 and the like, standard tensile samples mainly comprise rectangular samples (applied to thin plates) and dumbbell-shaped samples (applied to medium and thick plates). For rectangular samples, sample clamping centering in the test process is a very important link. According to ASTM E8/E8M, eccentricity has a very large influence on the test results, for example, stress will increase by 1.5% per 0.025mm for a standard rectangular specimen of width 12.5mm, by 2.5% per 0.025mm for a standard rectangular specimen of width 9.0mm, and by 3.2% per 0.025mm for a standard rectangular specimen of width 6.0 mm. Therefore, centering becomes critical for rectangular samples during the tensile test clamping process. The fixture equipped with the testing machine is usually provided with an L-shaped centering device, and the application of the device can realize that the symmetry line of the sample is coincident with the symmetry line of the sensor of the testing machine, and before realizing the function, the symmetry axis of the clamping end of the sample needs to be identified. At present, a sample is commonly clamped through two baffles, drawing of a sample symmetry line is completed through a scribing pen, but the scribing pen is easy to change in scribing direction due to the fact that a scribing device is easy to drive to move in the process of rotating a screw rod to enable the baffles to slide, and accuracy of drawing of the sample symmetry line is reduced. Therefore, there is a need to provide a sample symmetry line marking device to solve the above-mentioned problems. Disclosure of utility model The utility model aims to provide a sample symmetry line marking device, which solves the problem that the moving direction of a scribing pen is deviated in the process of clamping a sample, thereby achieving the effect of improving the drawing accuracy of the sample symmetry line. To achieve the purpose, the utility model adopts the following technical scheme: A specimen symmetry line marking device comprising: The adjusting assembly comprises a screw rod, a first clamping piece and a second clamping piece, grooves are formed in the middle of the screw rod along the circumferential direction of the screw rod along the axial direction of the screw rod, first external threads and second external threads with opposite screw directions are arranged on the screw rod at intervals, first internal threads are arranged on the first clamping piece, second internal threads are arranged on the second clamping piece, the first external threads are in threaded fit with the first internal threads, the second external threads are in threaded fit with the second internal threads, the first clamping piece and the second clamping piece are symmetrically arranged about the middle of the screw rod, and a sample can be clamped between the first clamping piece and the second clamping piece; The scribing assembly comprises a scribing pen and a scribing pen positioning piece, the scribing pen positioning piece is rotationally connected with the screw rod, the scribing pen is connected with the scribing pen positioning piece, a pen point of the scribing pen faces to the surface of the sample, and the scribing pen can reciprocate along the direction perpendicular to the axial direction of the screw rod; And the locating pin penetrates through the marking pen locating piece and is inserted into the groove, and the side surface of the locating pin is attached to the wall of the groove. Preferably, the groove is an annular groove. Preferably, the scribing pen locating piece is provided with a connecting part, the connecting part is provided with a through hole, and the screw rod is rotatably arranged through the through hole. Preferably, the scribing pen positioning piece is further provided with a guide part, the guide part is fixedly connected with the connecting part, the guide part is provided with a chute, the side surface of the scribing pen is in sliding fit with the chute wall of the chute along the width direction of the chute, the length direction of the chute is perpendicular to the axial direction of the screw rod, and the scribing pen movably penetrates through the chute and can reciprocate along the length direction of the chute. Preferably, the sample symmetry line marking device further comprises a fixing seat, and the first clamping piece and the second clamping piece are connected with the fixing seat. Preferably, the fixing seat is provided with a through groove, the first clamping piece is provided with a first protruding portion, the se