Sample symmetric line marking device
By employing adjustment and scribing components in the sample clamping device, the problem of scribing pen offset was solved, enabling high-precision drawing of the sample symmetry line and ensuring the accuracy and efficiency of the drawing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI AIRCRAFT MFG
- Filing Date
- 2025-04-07
- Publication Date
- 2026-05-08
AI Technical Summary
During the sample clamping process, the direction of movement of the scribing pen is prone to deviation, resulting in inaccurate drawing of the sample's symmetry line.
The design employs an adjustment component and a scribing component, including a screw, a first clamping component, and a second clamping component. The screw has opposite threads, and the clamping components are symmetrically arranged through threaded engagement. Combined with a positioning pin and a scribing pen positioning component, the scribing pen is positioned in the length direction of the screw to prevent displacement.
It improves the accuracy of drawing the symmetry line of the sample, ensuring that the scribing pen stays on the symmetry line during the clamping process, which greatly improves the drawing efficiency and accuracy.
Smart Images
Figure CN224216431U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of material mechanical property testing technology, and in particular to a sample symmetry line marking device. Background Technology
[0002] Tensile testing is a specialized method for measuring the mechanical properties of metallic materials using an electronic universal testing machine. According to test standards such as ASTM E8 / E8M and GB / T 228.1, standard tensile specimens mainly include rectangular specimens (used for thin plates) and dumbbell-shaped specimens (used for medium and thick plates).
[0003] For rectangular specimens, proper specimen clamping and alignment during the test is crucial. According to ASTM E8 / E8M, eccentricity has a significant impact on test results. For example, for a standard rectangular specimen with a width of 12.5 mm, every 0.025 mm of eccentricity increases the stress by 1.5%; for a standard rectangular specimen with a width of 9.0 mm, every 0.025 mm of eccentricity increases the stress by 2.5%; and for a standard rectangular specimen with a width of 6.0 mm, every 0.025 mm of eccentricity increases the stress by 3.2%. Therefore, alignment becomes critical during the clamping process for rectangular specimens in tensile testing. Testing machines are typically equipped with L-shaped alignment devices. This device ensures that the specimen's line of symmetry coincides with the line of symmetry of the testing machine's sensor. Before implementing this function, the axis of symmetry at the specimen clamping end needs to be marked.
[0004] Currently, the common method is to clamp the sample with two baffles and draw the symmetry line of the sample with a scribing pen. However, when the baffles are slid by rotating the screw, the scribing device is easily moved, which causes the scribing direction of the pen to change and reduces the accuracy of the symmetry line drawing.
[0005] Therefore, there is an urgent need to propose a sample symmetry line marking device to solve the above problems. Utility Model Content
[0006] The purpose of this invention is to provide a sample symmetry line marking device to solve the problem of the marking pen shifting direction during the sample clamping process, thereby improving the accuracy of sample symmetry line drawing.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] A sample symmetry line marking device, comprising:
[0009] The adjustment assembly includes a screw, a first clamping member, and a second clamping member. Along the axial direction of the screw, a groove is formed in the middle of the screw along its circumference. The screw is provided with a first external thread and a second external thread with opposite helical directions at intervals. The first clamping member is provided with a first internal thread, and the second clamping member is provided with a second internal thread. The first external thread is threadedly engaged with the first internal thread, and the second external thread is threadedly engaged with the second internal thread. The first clamping member and the second clamping member are symmetrically arranged about the middle of the screw, and the sample can be clamped between the first clamping member and the second clamping member.
[0010] The scribing assembly includes a scribing pen and a scribing pen positioning component. The scribing pen positioning component is rotatably connected to the screw. The scribing pen is connected to the scribing pen positioning component. The tip of the scribing pen faces the surface of the sample. The scribing pen can reciprocate in a direction perpendicular to the axial direction of the screw.
[0011] The positioning pin passes through the marking pen positioning component and is inserted into the groove, with the side surface of the positioning pin fitting against the groove wall.
[0012] Preferably, the groove is an annular groove.
[0013] Preferably, the marking pen positioning component is provided with a connecting part, and the connecting part has a through hole, through which the screw rotates.
[0014] Preferably, the marking pen positioning component is also provided with a guide part, which is fixedly connected to the connecting part. A groove is provided on the guide part. Along the width direction of the groove, the side surface of the marking pen slides against the groove wall. The length direction of the groove is perpendicular to the axis of the screw. The marking pen moves through the groove and can reciprocate along the length direction of the groove.
[0015] Preferably, the sample symmetry line marking device further includes a fixing base, and the first clamping member and the second clamping member are connected to the fixing base.
[0016] Preferably, the fixed base is provided with a through groove, the first clamping member is provided with a first protrusion, and the second clamping member is provided with a second protrusion. The length direction of the through groove is parallel to the axial direction of the screw, and the first protrusion and the second protrusion are both slidably disposed in the through groove.
[0017] Preferably, the width of the slot opening is minimized along the depth direction of the slot.
[0018] Preferably, the adjustment assembly also includes a grip, one end of which is fixedly connected to one end of the screw.
[0019] Preferably, the number of grippers is at least two, and the at least two grippers are distributed around the screw.
[0020] Preferably, the sample symmetry line marking device further includes a limiting member, which is fixed along the axial direction of the screw to one end of the first external thread that is opposite to the second external thread, and / or the limiting member is fixed to one end of the second external thread that is opposite to the first external thread.
[0021] The beneficial effects of this utility model are:
[0022] This utility model provides a sample symmetry line marking device, including an adjustment component, a scribing component, and a positioning pin. The adjustment component includes a screw, a first clamping member, and a second clamping member. Along the axial direction of the screw, a groove is formed in the middle of the screw in the circumferential direction. The screw has a first external thread and a second external thread with opposite helical directions spaced apart. The first clamping member has a first internal thread, and the second clamping member has a second internal thread. The first external thread and the first internal thread are threadedly engaged, and the second external thread and the second internal thread are threadedly engaged. The first clamping member and the second clamping member are symmetrically arranged about the middle of the screw, and the sample can be clamped between the first clamping member and the second clamping member. The scribing component includes a scribing pen and a scribing pen positioning member. The scribing pen positioning member is rotatably connected to the screw, and the scribing pen is connected to the scribing pen positioning member. The tip of the scribing pen faces the surface of the sample, and the scribing pen can reciprocate in a direction perpendicular to the axial direction of the screw. The positioning pin passes through the scribing pen positioning member and is inserted into the groove. The side surface of the positioning pin is in contact with the groove wall. In this device, the first clamping member and the second clamping member are symmetrically arranged with the bottom of the groove in the middle of the screw as the center. When the first clamping member and the second clamping member clamp the sample simultaneously along the first external thread and the second external thread, respectively, since the helical directions of the first external thread and the second external thread are opposite, the first clamping member and the second clamping member can slide the same distance relative to each other or in opposite directions along the axial direction of the screw, thereby realizing that the first clamping member and the second clamping member are always symmetrically distributed with the bottom of the groove as the center. The positioning pin passes through the marking pen positioning component and is inserted into the groove, thereby positioning the marking pen positioning component along the length of the screw. This ensures the marking pen is positioned along the length of the screw, and thus keeps the marking pen always on the line of symmetry between the first and second clamping components. When the first and second clamping components hold the sample, the tip of the marking pen is directly facing the line of symmetry of the sample in the width direction. Sliding the marking pen along the direction perpendicular to the screw axis allows the marking pen to draw the vertical line of symmetry of the sample in the width direction. Throughout the adjustment and drawing process, the marking pen positioning component remains on the line of symmetry between the first and second clamping components, thus keeping the direction of movement of the marking pen constant and greatly improving the accuracy of the sample's line of symmetry. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the tensile sample preparation symmetry line marking device provided in this embodiment;
[0024] Figure 2This is a schematic diagram of the symmetry line marking device for tensile sample preparation provided in this embodiment (the marking component is not shown).
[0025] In the picture:
[0026] 11. Screw; 111. Groove; 12. First clamping member; 13. Second clamping member; 14. Grip member; 21. Marking pen; 22. Marking pen positioning member; 221. Connecting part; 222. Guide part; 223. Slide groove; 3. Positioning pin; 4. Fixing seat; 41. Through groove; 5. Sample; 51. Clamped part. Detailed Implementation
[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0030] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0031] This embodiment provides a sample symmetry line marking device, which solves the problem of the marking pen deviating in the direction of movement during the clamping of the sample, thereby improving the accuracy of the sample symmetry line drawing.
[0032] Specifically, such as Figures 1 to 2As shown, this utility model provides a sample symmetry line marking device, including an adjustment assembly, a scribing assembly, and a positioning pin 3. The adjustment assembly includes a screw 11, a first clamping member 12, and a second clamping member 13. Along the axial direction of the screw 11, a groove 111 is formed in the middle of the screw 11 along its circumference. The screw 11 is provided with a first external thread and a second external thread with opposite helical directions at intervals. The first clamping member 12 is provided with a first internal thread, and the second clamping member 13 is provided with a second internal thread. The first external thread and the first internal thread are threadedly engaged, and the second external thread and the second internal thread are threadedly engaged. The first clamping member 12 and the second clamping member 13 are symmetrically arranged about the middle of the screw 11, and the sample 5 can be clamped between the first clamping member 12 and the second clamping member 13; the marking assembly includes a marking pen 21 and a marking pen positioning member 22. The marking pen positioning member 22 is rotatably connected to the screw 11, and the marking pen 21 is connected to the marking pen positioning member 22. The tip of the marking pen 21 faces the surface of the sample 5, and the marking pen 21 can reciprocate in a direction perpendicular to the axial direction of the screw 11; the positioning pin 3 passes through the marking pen positioning member 22 and is inserted into the groove 111, and the surface of the positioning pin 3 is in contact with the groove wall of the groove 111. In this device, the first clamping member 12 and the second clamping member 13 are symmetrically arranged with the bottom of the groove 111 in the middle of the screw 11 as the center. When the first clamping member 12 and the second clamping member 13 clamp the sample 5 simultaneously along the first external thread and the second external thread, the first clamping member 12 and the second clamping member 13 can slide the same distance relative to each other or in opposite directions along the axial direction of the screw 11, so that the first clamping member 12 and the second clamping member 13 are always symmetrically distributed with the bottom of the groove 111 as the center. The positioning pin 3 passes through the marking pen positioning component 22 and is inserted into the groove 111, thereby positioning the marking pen positioning component 22 in the length direction of the screw 11. This ensures that the marking pen 21 is positioned in the length direction of the screw 11, and thus keeps the marking pen 21 always on the line of symmetry between the first clamping component 12 and the second clamping component 13. When the first clamping component 12 and the second clamping component 13 hold the sample 5, the tip of the marking pen 21 is exactly facing the line of symmetry of the sample 5 in the width direction. By sliding the marking pen 21 in the direction perpendicular to the axis of the screw 11, the vertical line of symmetry of the sample 5 in the width direction can be drawn. Throughout the adjustment and drawing process of the line of symmetry, the marking pen positioning component 22 is always on the line of symmetry between the first clamping component 12 and the second clamping component 13, thus keeping the direction of movement of the marking pen 21 unchanged. This greatly improves the efficiency and accuracy of drawing the line of symmetry of the sample 5. Moreover, the entire marking device has a simple structure, is easy to maintain, and helps to save on usage and maintenance costs. In this embodiment, the marking pen 21 is a pencil; in other embodiments, the marking pen 21 can be a marker or a laser pointer. In this embodiment, the specimen 5 is a tensile specimen; in other embodiments, the specimen 5 can be a fatigue specimen.
[0033] Furthermore, the groove 111 is an annular groove, allowing the locating pin 3 to slide relative to the groove wall during the rotation of the screw 11. This prevents the locating pin 3 from rotating with the screw 11, keeping its position fixed. This avoids the scriber 21 rotating due to the screw 11 rotating, which would prevent the drawing of the symmetry line of the sample 5 and reduce the accuracy of the symmetry line drawing. In other embodiments, the groove 111 can be an arc-shaped groove distributed circumferentially along the screw 11, with the arc angle greater than or equal to the rotation angle of the screw 11.
[0034] Optionally, the marking pen positioning component 22 is provided with a connecting part 221, and the connecting part 221 is provided with a through hole. The screw 11 is rotatably inserted through the through hole. The rotational connection between the screw 11 and the connecting part 221 is realized through the rotational connection between the marking pen positioning component 22 and the screw 11.
[0035] Optionally, the marking fixture is further provided with a guide portion 222, which is fixedly connected to the connecting portion 221. The guide portion 222 is provided with a groove 223. Along the width direction of the groove 223, the side surface of the marking pen 21 slides against the groove wall of the groove 223. The length direction of the groove 223 is perpendicular to the axis of the screw 11. The marking pen 21 is movably inserted into the groove 223 and can reciprocate along the length direction of the groove 223, realizing the sliding connection between the marking pen 21 and the marking pen positioning component 22. The setting of the groove 223 realizes the sliding of the marking pen 21 along the length direction of the groove 223, and the contact between the groove wall and the side surface of the marking pen 21 along the width direction of the groove 223, which restricts the wobbling of the marking pen 21 along the width direction of the groove 223, thereby avoiding the drawing error of the symmetry line of the sample 5 caused by the wobbling of the marking pen 21. In other embodiments, one of the marking pen 21 and the guide part 222 is provided with a guide groove, and the other is provided with a guide rail. The guide groove and the guide rail cooperate to realize the sliding connection between the marking pen 21 and the marking pen positioning member 22.
[0036] Optionally, the sample symmetry line marking device also includes a fixing base 4, with the first clamping member 12 and the second clamping member 13 connected to the fixing base 4 to fix the first clamping member 12 and the second clamping member 13 and the entire sample symmetry line marking device on the test table.
[0037] Furthermore, the fixed base 4 is provided with a through groove 41, the length direction of which is parallel to the axial direction of the screw 11. The first clamping member 12 is provided with a first protrusion, and the second clamping member 13 is provided with a second protrusion. Both the first protrusion and the second protrusion are slidably disposed in the through groove 41, thereby realizing the sliding connection between the first clamping member 12 and the second clamping member 13 and the fixed base 4, and thus realizing the sliding of the first clamping member 12 and the second clamping member 13 on the fixed base 4 along the axial direction of the screw 11.
[0038] Furthermore, the width of the opening of the through groove 41 is the smallest along the depth direction of the through groove 41. The groove wall at the opening of the through groove 41 is tightly engaged with the side walls of the first protrusion and the second protrusion, which improves the connection stability between the first clamping member 12 and the second clamping member 13 and the fixing base 4. This prevents the first protrusion and the second protrusion from disengaging from the through groove 41 during sliding along the through groove 41, which would prevent the first clamping member 12 and the second clamping member 13 from clamping the sample 5, thereby causing errors in the drawing of the symmetry line of the sample 5 and reducing the drawing efficiency. In this embodiment, the cross-section of the through groove 41 is a trapezoidal dovetail groove; in other embodiments, the cross-section of the through groove 41 is an arc shape.
[0039] Optionally, the sample symmetry line marking device further includes a limiting member. Along the axial direction of the screw 11, the end of the first external thread facing away from the second external thread is a first limiting part. The limiting member is fixed to the first limiting part on the screw. When the first clamping member 12 slides to the first limiting part and abuts against the limiting member, the sliding of the first clamping member 12 stops. At this time, the rotation of the screw 11 is forced to stop, so that the first clamping member 12 and the second clamping member 13 no longer slide, thereby effectively preventing the first clamping member 12 and the second clamping member 13 from detaching from the screw 11 during the sliding process. In other embodiments, the end of the second external thread facing away from the first external thread is a second limiting part, and the limiting member is fixed to the second limiting part on the screw; or, the two limiting members are respectively fixed to the first limiting part and the second limiting part.
[0040] Furthermore, the first clamping member 12 is provided with a first clamping part, and the second clamping member 13 is provided with a second clamping part. Along the sliding direction of the first clamping member 12, the first clamping part faces the second clamping member 13, and the second clamping part faces the first clamping member 12. The two opposite sides of the sample 5 along the width direction are clamped parts 51. The clamped parts 51 can be clamped between the first clamping part and the second clamping part, so as to realize the clamping of the tensile sample 5 by the first clamping member 12 and the second clamping member 13, and prevent the sample 5 from moving during the drawing process of the scribing pen 21.
[0041] Optionally, the adjustment assembly further includes a gripper 14, one end of which is fixedly connected to one end of the screw 11. Rotating the other end of the gripper 14 allows the screw 11 to rotate along its axis, improving the ease of rotation of the screw 11 and making the adjustment of the distance between the first clamping member 12 and the second clamping member 13 more convenient, thus achieving a labor-saving effect. In this embodiment, the gripper 14 is rod-shaped; in another embodiment, the gripper 14 is a ring coaxial with the screw 11.
[0042] Furthermore, the number of gripping members 14 at one end of the screw 11 is at least two, and the at least two gripping members 14 are distributed circumferentially along the screw 11. During rotation, the different gripping members 14 are easier to control, further improving the ease of rotation of the screw 11. In addition, the at least two gripping members 14 can also control different angles of the screw 11. In this embodiment, the number of gripping members 14 at one end of the screw 11 is one; in other embodiments, the number of gripping members 14 at one end of the screw 11 can be two, three, or five, etc. In this embodiment, the gripping members 14 are fixedly installed at both ends of the screw 11; in other embodiments, the gripping members 14 are installed at one end of the screw 11.
[0043] Furthermore, at least two gripping members 14 are evenly distributed along the circumference of the screw 11, and the distance between two adjacent gripping members 14 is equal, which makes the operator's control over the rotation angle of the screw 11 more accurate and further improves the rotation accuracy of the screw 11.
[0044] The method of using the sample symmetry line marking device provided in this embodiment is as follows:
[0045] S1. Rotate the screw 11 by rotating the gripper 14, so that the first clamp 12 and the second clamp 13 slide simultaneously along the through groove 41 in opposite directions, and adjust the distance between the first clamp 12 and the second clamp 13 to be significantly greater than the width of the sample 5.
[0046] S2. Place the sample 5 on the upper surface of the fixed base 4, and place the clamped part 51 of the sample 5 between the first clamping part and the second clamping part.
[0047] S3. Rotate the gripper 14 in the opposite direction to rotate the screw 11, so that the first clamping member 12 and the second clamping member 13 slide simultaneously along the through groove 41 in opposite directions until the first clamping part and the second clamping part clamp the clamped part 51. At this time, the first clamping member 12 and the second clamping member 13 no longer slide, and the tip of the scribing pen 21 is directly facing the symmetrical line of the sample 5 along the width direction.
[0048] S4. Along the length of the groove 223, use the scribing pen 21 to scribble from one side wall of the groove 223 to the other side wall to complete the drawing of the symmetry line of the sample 5 along the width direction.
[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A sample symmetry line marking device, characterized in that, include: The adjustment assembly includes a screw (11), a first clamping member (12), and a second clamping member (13). Along the axial direction of the screw (11), a groove (111) is provided in the middle of the screw (11) along its circumference. The screw (11) is provided with a first external thread and a second external thread with opposite helical directions at intervals. The first clamping member (12) is provided with a first internal thread, and the second clamping member (13) is provided with a second internal thread. The first external thread is threadedly engaged with the first internal thread, and the second external thread is threadedly engaged with the second internal thread. The first clamping member (12) and the second clamping member (13) are symmetrically arranged about the middle of the screw (11), and the sample (5) can be clamped between the first clamping member (12) and the second clamping member (13). The marking assembly includes a marking pen (21) and a marking pen positioning component (22). The marking pen positioning component (22) is rotatably connected to the screw (11). The marking pen (21) is connected to the marking pen positioning component (22). The tip of the marking pen (21) faces the surface of the sample (5). The marking pen (21) can reciprocate in a direction perpendicular to the axial direction of the screw (11). The positioning pin (3) passes through the marking pen positioning member (22) and is inserted into the groove (111). The side surface of the positioning pin (3) is in contact with the groove wall of the groove (111).
2. The sample symmetry line marking device according to claim 1, characterized in that, The groove (111) is an annular groove.
3. The sample symmetry line marking device according to claim 1, characterized in that, The marking pen positioning component (22) is provided with a connecting part (221), and a through hole is provided on the connecting part (221). The screw (11) is rotatably inserted through the through hole.
4. The sample symmetry line marking device according to claim 3, characterized in that, The marking pen positioning component (22) is also provided with a guide part (222), which is fixedly connected to the connecting part (221). The guide part (222) is provided with a sliding groove (223). Along the width direction of the sliding groove (223), the side surface of the marking pen (21) slides against the groove wall of the sliding groove (223). The length direction of the sliding groove (223) is perpendicular to the axial direction of the screw (11). The marking pen (21) is movably inserted into the sliding groove (223) and can reciprocate along the length direction of the sliding groove (223).
5. The sample symmetry line marking device according to claim 1, characterized in that, The sample symmetry line marking device also includes a fixing base (4), and the first clamping member (12) and the second clamping member (13) are connected to the fixing base (4).
6. The sample symmetry line marking device according to claim 5, characterized in that, The fixed base (4) is provided with a through groove (41), the first clamping member (12) is provided with a first protrusion, and the second clamping member (13) is provided with a second protrusion. The length direction of the through groove (41) is parallel to the axial direction of the screw (11), and the first protrusion and the second protrusion are both slidably disposed in the through groove (41).
7. The sample symmetry line marking device according to claim 6, characterized in that, Along the depth direction of the through groove (41), the width at the opening of the through groove (41) is the smallest.
8. The sample symmetry line marking device according to claim 1, characterized in that, The adjustment assembly also includes a grip (14), one end of which is fixedly connected to one end of the screw (11).
9. The sample symmetry line marking device according to claim 8, characterized in that, The number of grips (14) is at least two, and at least two grips (14) are distributed around the screw (11).
10. The sample symmetry line marking device according to any one of claims 1-9, characterized in that, The sample symmetry line marking device further includes a limiting member, which is fixed to one end of the first external thread away from the second external thread along the axial direction of the screw (11), and / or the limiting member is fixed to one end of the second external thread away from the first external thread.