A dotting and gaging device for metal specimen tensile test

Abstract

The application discloses a kind of metal test piece tensile test dotting and marking distance device, it is related to metal tensile test technical field, including dotting and marking line subassembly, caliper subassembly, control subassembly;Dotting and marking line subassembly includes support platform, dotting piece, positioning piece, positioner, transmission wheel, first pusher;Caliper subassembly includes first caliper piece, second caliper piece, third caliper piece, first distance adjusting piece, second distance adjusting piece, control subassembly includes controller and stopper, the first caliper piece, second caliper piece, third caliper piece of being set, first caliper piece, second caliper piece, third caliper piece can be adjusted respectively located in the both ends and middle part of metal test piece, to complete the outer diameter measurement of metal test piece once, more convenient, save time and effort;The dotting piece for being set is in the original marking distance section of metal test piece Dotting operation is carried out, to realize mechanical operation in metal tensile test, from the outer diameter measurement of metal test piece to subsequent dotting and marking.

Description

Technical Field

[0001] This invention relates to the field of metal tensile testing technology, and specifically to a gauge length device for tensile testing of metal specimens. Background Technology

[0002] Tensile testing is a test method for determining the properties of materials under axial tensile load. Data obtained from tensile testing can be used to determine a material's elastic limit, elongation, modulus of elasticity, proportional limit, reduction of area, tensile strength, yield point, yield strength, and other tensile performance indicators.

[0003] Metal tensile testing is typically performed using a tensile testing machine, which consists of a machine body and a microcomputer system. The machine body is used to clamp the metal specimen and apply tension, while the microcomputer system is used to input and record the values ​​of the metal specimen. Before conducting the tensile test, firstly, it is necessary to measure the outer diameter of the metal specimen at the middle and both ends, and take the minimum value as the original cross-sectional area to input into the microcomputer system. Secondly, it is necessary to use a scribing machine to scribe a circumferential line within the original gauge length of the metal specimen (or use a small steel punch to make small punch points), dividing the gauge length into 10 equal divisions, so that the length of the metal specimen can be measured after it breaks.

[0004] The common method for measuring the outer diameter of a metal specimen is to use a vernier caliper to measure the outer diameter of the middle and both ends of the metal specimen, record the values, and finally compare them and input the smallest value into the computer system. However, the measurement process requires three measurements with the vernier caliper to meet the requirements, which is cumbersome. When marking lines on the outside of the metal specimen after measurement, the metal specimen needs to be placed on two support platforms of the marking machine. The distance between the two support platforms is adjusted to accommodate metal specimens of different lengths, and the marking steel columns on the marking machine are adjusted so that 10 sets are located within the original gauge length of the metal specimen, thus dividing the original gauge length into 10 equal divisions. When adjusting the distance between the two support platforms, the existing marking machine requires manual operation for adjusting the distance between the two support platforms, adjusting the position of the metal specimen, and marking the lines, so that the 10 sets of marking steel columns are located within the original gauge length of the metal specimen. This operation is cumbersome, time-consuming, and labor-intensive. Summary of the Invention

[0005] The main objective of this invention is to provide a marking gauge device for tensile testing of metal specimens, which solves the problem that existing methods require manual measurement of the outer diameter of the metal specimen, adjustment of the metal specimen, and marking of the metal specimen by a marking and scribing machine during the tensile testing of metal specimens.

[0006] To achieve the above objectives, the present invention provides a gauge length device for tensile testing of metal specimens, comprising: A marking and marking assembly includes a support platform, a marking element rotatably mounted on the support platform, a positioning element, and an adjusting element mounted on the support platform. The support platform is spaced apart by a transmission wheel and a first pushing element. A transmission element is connected to one of the transmission wheels, and a support crossbar is mounted on the transmission wheel. A second pushing element is mounted on the support crossbar. The marking element is mounted on the second pushing element. Under external force, the transmission element meshes with the transmission wheel, causing the transmission element and the marking element to rotate axially along the positioning element. Under external force, the second pushing element reciprocates, causing the marking element to reciprocate towards the centerline of the positioning element. The adjusting element has the same shape as the positioning element and its centerline extension coincides with the centerline. The adjusting element is mounted on the first pushing element and has a limiting element. Under external force, the first pushing element reciprocates horizontally, causing the adjusting element to reciprocate towards or away from the positioning element, thereby adjusting the distance between the adjusting element and the positioning element so that the original gauge length of the metal specimen is located in the gap between the positioning element and the adjusting element. The diameter measuring assembly includes a first diameter measuring element, a second diameter measuring element, and a third diameter measuring element spaced apart below a positioning element; a first adjusting element and a second adjusting element mounted on a support platform and respectively connected to the second and third diameter measuring elements; the first adjusting element and the second adjusting element operate under external force to respectively move the second and third diameter measuring elements toward or away from the first diameter measuring element; the working speed of the second adjusting element is twice that of the first adjusting element, so that the moving speed of the third diameter measuring element is twice that of the second diameter measuring element; the first diameter measuring element, the second diameter measuring element, and the third diameter measuring element are respectively used to measure the outer diameter of an external metal specimen; The control assembly includes a controller and a limiter mounted on a support platform; the controller is electrically connected to a first pusher, a transmission component, a second pusher, a first adjusting component, a second adjusting component, and a limiter, respectively.

[0007] As a further improvement of the present invention, the support platform is provided with support plates at intervals; the support plates are provided with rotating shafts; the transmission wheel is rotatably mounted on the rotating shaft, and the transmission wheel is provided with a support crossbar; the second pushing member is mounted on the support crossbar.

[0008] As a further improvement of the present invention, the dotting component includes a dotting sleeve and multiple sets of dotting steel columns spaced apart within the dotting sleeve; the dotting sleeve is fixedly connected to the second pusher; a protective cover is provided on the support plate; the limiter is installed on the protective cover; the support crossbar abuts against the limiter when the transmission wheel rotates, so that the extension line of the dotting steel column along the axial direction intersects perpendicularly with the center line of the positioning component.

[0009] As a further improvement of the present invention, the thickness of the supporting crossbar is the same as the thickness of the dotting sleeve; the dotting steel column is installed at the center position of the dotting sleeve; the horizontal distance from the end face of the limiter facing the supporting crossbar to the center line of the positioning component is the same as the distance from the outer wall of the dotting sleeve to the axis of the dotting steel column.

[0010] As a further improvement of the present invention, the positioning member and the adjusting member are respectively provided with a first placement groove and a second placement groove whose size decreases in the direction away from the dotting member; the limiting member is installed in the second placement groove.

[0011] As a further improvement of the present invention, the end of the positioning member away from the adjusting member is provided with a baffle located in the first placement groove, and the extension line of the end face of the positioning member near the adjusting member in the vertical direction is tangent to the side of the dotting steel column closest to the transmission wheel.

[0012] As a further improvement of the present invention, a sliding plate is provided on the support platform; two sets of sliding grooves are provided on the sliding plate at intervals; the first diameter measuring component is installed on the sliding plate, and the extension line of the first diameter measuring component in the vertical direction is tangent to the end of the positioning component facing the adjustment component; the second diameter measuring component and the third diameter measuring component are respectively installed in the two sets of sliding grooves.

[0013] As a further improvement of the present invention, the radial direction of the groove is parallel to the radial directions of the first placement groove and the second placement groove.

[0014] As a further improvement of the present invention, the first diameter measuring component includes a first sliding sleeve, a first measuring component disposed within the first sliding sleeve, and a first forward pusher and a first backward pusher respectively disposed at both ends of the first sliding sleeve; the first forward pusher and the first backward pusher are respectively connected to the first measuring component, and the first forward pusher and the first backward pusher push the first measuring component to clamp the external metal specimen under the action of external force; the second diameter measuring component includes a second sliding sleeve, a second measuring component disposed within the second sliding sleeve, and a second forward pusher and a second backward pusher respectively disposed at both ends of the second sliding sleeve; the second forward pusher and the second backward pusher are respectively connected to the second measuring component, and the second forward pusher and the second backward pusher push the second measuring component to clamp the external metal specimen under the action of external force; the third diameter measuring component includes a third sliding sleeve, a third measuring component disposed within the third sliding sleeve, and a third forward pusher and a third backward pusher respectively disposed at both ends of the third sliding sleeve; the third forward pusher and the third backward pusher are respectively connected to the third measuring component, and the third forward pusher and the third backward pusher push the third measuring component to clamp the external metal specimen under the action of external force.

[0015] The beneficial effects of this invention are reflected in: By setting up positioning and adjusting components, the metal specimen can be placed and fixed, facilitating subsequent measurement of the outer diameter and gauge length of the metal specimen. The first, second, and third diameter measuring components, driven by the first and second adjusting components, can be adjusted to be located at both ends and the middle of the metal specimen, respectively, thus completing the outer diameter measurement of the metal specimen in one step, which is more convenient, time-saving, and labor-saving. The marking component, under the action of the transmission and second pushing components, performs marking operations within the original gauge length range of the metal specimen. Therefore, in the metal tensile test, from measuring the outer diameter of the metal specimen to the subsequent marking of the gauge length, the entire process is mechanical, eliminating the need for multiple manual adjustments and operations, and improving work efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a dotting gauge length device for tensile testing of metal specimens according to the present invention. Figure 2 This is a schematic diagram of the internal structure of the transmission component of the marking gauge device for tensile testing of metal specimens according to the present invention. Figure 3 This is a schematic diagram of the positioning component of a marking gauge device for tensile testing of metal specimens according to the present invention; Figure 4 This is a schematic diagram of the adjusting component of a marking gauge device for tensile testing of metal specimens according to the present invention. Figure 5 This is a schematic diagram of the diameter measuring component of a dotted gauge length device for tensile testing of metal specimens according to the present invention. Explanation of reference numerals in the attached figures: 1. Support platform; 101. Support plate; 102. Support frame; 2. Marking component; 201. Marking sleeve; 202. Marking steel column; 3. Positioning component; 4. Adjusting component; 5. Transmission wheel; 6. First pushing component; 7. Transmission component; 701. Transmission motor; 702. Driven gear; 8. Second pushing component; 9. Limiting component; 10. First measuring component; 1001. First sliding sleeve; 1002. First measuring component; 1003. First forward pushing component; 1004. First backward pushing component; 11. Second measuring component; 1101. Second sliding sleeve; 1102. Second measuring component; 1103. Second forward pushing component ; 1104, Second push-back component; 12, Third diameter measuring component; 1201, Third sliding sleeve; 1202, Third measuring component; 1203, Third forward push-back component; 1204, Third push-back component; 13, First adjusting component; 14, Second adjusting component; 15, Controller; 16, Limiter; 17, Support plate; 18, Rotating shaft; 19, Support crossbar; 20, Protective cover; 21, Limiting groove; 22, First placement groove; 23, Second placement groove; 24, Baffle; 25, Limiting plate; 26, Adjusting plate; 27, Screw; 28, Slide plate; 29, Slide groove; 30, Touch limit switch; 31, Slider. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, of the embodiments of this invention. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0018] In one embodiment, see Figure 1 The present invention provides a marking gauge device for tensile testing of metal specimens, comprising a marking and scribing assembly, a diameter measuring assembly, and a control assembly.

[0019] The marking and marking assembly includes a support platform 1, a marking element 2 rotatably mounted on the support platform 1, a positioning element 3 and an adjusting element 4 mounted on the support platform 1. The support platform 1 has a transmission wheel 5 and a first pushing element 6 spaced apart. One of the transmission wheels 5 is connected to a transmission element 7, and a support crossbar 19 is mounted on the transmission wheel 5. A second pushing element 8 is mounted on the support crossbar 19, and the marking element 2 is mounted on the second pushing element 8. The transmission element 7 meshes with the transmission wheel 5 under external force, causing the transmission element 7 and the marking element 2 to rotate along the axial direction of the positioning element 3. The second pushing element 8 reciprocates under external force, causing the marking element 2 to reciprocate towards the center line of the positioning element 3. The adjusting element 4 has the same shape as the positioning element 3 and its center line extension coincides with the center line extension. The adjusting element 4 is mounted on the first pushing element 6 and has a limiting element 9. The first pushing element 6 reciprocates horizontally under external force, causing the adjusting element 4 to reciprocate towards or away from the positioning element 3, thereby adjusting the adjusting element 4 and the positioning element 3. The spacing between the positioning components 3; the diameter measuring assembly includes a first diameter measuring component 10, a second diameter measuring component 11, and a third diameter measuring component 12 spaced below the positioning components 3, a first adjusting component 13 and a second adjusting component 14 mounted on the support platform 1 and connected to the second diameter measuring component 11 and the third diameter measuring component 12 respectively. The first adjusting component 13 and the second adjusting component 14 work under the action of external force to drive the second diameter measuring component 11 and the third diameter measuring component 12 toward or away from the first diameter measuring component 10 respectively. The working speed of the second adjusting component 14 is twice that of the first adjusting component 13, so that the moving speed of the third diameter measuring component 12 is twice that of the second diameter measuring component 11. The first diameter measuring component 10, the second diameter measuring component 11, and the third diameter measuring component 12 are used to measure the outer diameter of the external metal specimen respectively. The control assembly includes a controller 15 and a limiter 16 mounted on the support platform 1. The controller 15 is electrically connected to the first pusher 6, the transmission component 7, the second pusher 8, the first adjusting component 13, the second adjusting component 14, and the limiter 16 respectively.

[0020] For details, see Figure 1 The support platform 1 is provided with support plates 17 at intervals, and the support plates 17 are provided with rotating shafts 18. The transmission wheel 5 is rotatably mounted on the rotating shaft 18, and the transmission wheel 5 is provided with a support crossbar 19. The second pusher 8 is mounted on the support crossbar 19.

[0021] Preferably, the support platform 1 includes a support plate 101 and a support frame 102 disposed below the support plate 101. Two sets of support plates 17 are provided, and the two sets of support plates 17 are fixedly installed on the support plate 101 at intervals. The rotating shaft 18 is fixedly installed on the support plate 17.

[0022] Preferably, the transmission wheel 5 is a gear, and the center of the transmission wheel 5 is fixedly connected to the rotating shaft 18.

[0023] Preferably, the two ends of the support crossbar 19 are fixedly connected to the end faces of the two sets of transmission wheels 5 near their edges.

[0024] Preferably, the transmission component 7 includes a transmission motor 701 and a driven gear 702 disposed on the transmission motor 701, the driven gear 702 meshing with the transmission wheel 5.

[0025] In the above configuration, when the drive motor 701 drives the driven gear 702 to rotate, the driven gear 702 meshes with the drive wheel 5, thereby driving the drive wheel 5 to rotate. The support crossbar 19 drives the dotting element 2 to rotate accordingly, so that the dotting element 2 rotates along the axial direction of the positioning element 3, allowing the dotting element 2 to rotate above the positioning element 3.

[0026] Further, see Figure 2 The dotting component 2 includes a dotting sleeve 201 and multiple sets of dotting steel columns 202 spaced apart within the dotting sleeve 201. The dotting sleeve 201 is fixedly connected to the second pusher 8. A protective cover 20 is provided on the support plate 17, and a limiter 16 is installed on the protective cover 20. The support crossbar 19 abuts against the limiter 16 under the rotation of the transmission wheel 5, so that the extension line of the dotting steel column 202 along the axial direction intersects perpendicularly with the center line of the positioning component 3.

[0027] Preferably, the dotting sleeve 201 and the dotting steel column 202 can adopt the existing structure on the existing dotting and marking machine.

[0028] Preferably, both the first pusher 6 and the second pusher 8 can be existing hydraulic push rods or electric push rods.

[0029] Preferably, the protective cover 20 is a hollow semi-circular structure. The end face of the protective cover 20 facing the dotting member 2 is provided with a limiting groove 21. The support crossbar 19 passes through the limiting groove 21 and is connected to the transmission wheel 5. The center of the protective cover 20 is connected to the rotating shaft 18 so that the protective cover 20 encloses the transmission wheel 5.

[0030] Preferably, the limit switch 16 is an existing limit switch, and the limit switch 16 is installed in the limit groove 21.

[0031] Preferably, the thickness of the support crossbar 19 is the same as the thickness of the dotting sleeve 201, and the dotting steel column 202 is installed at the center of the dotting sleeve 201. The horizontal distance from the end face of the limiter 16 toward the support crossbar 19 to the center line of the positioning member 3 is the same as the distance from the outer wall of the dotting sleeve 201 to the axis of the dotting steel column 202, so that when the dotting sleeve 201 abuts against the limiter 16, the dotting steel column 202 is located directly above the positioning member 3, thereby making the extension line of the axis of the dotting steel column 202 perpendicular to the radial center line of the positioning member 3.

[0032] In the above setup, after the marking sleeve 201 and marking steel column 202 are rotated above the positioning member 3 by the drive motor 701, the support crossbar 19 abuts against the limiter 16, thereby stopping the drive motor 701. At this time, the marking steel column 202 is located directly above the positioning member 3, that is, the extension line of the axis of the marking steel column 202 intersects perpendicularly with the extension line of the axis of the positioning member 3. After the metal workpiece is placed in the positioning member 3 and the adjusting member 4, the marking steel column 202 is moved down under the push of the second pusher 8, thereby marking and engraving the gauge length on the metal test piece. The working time of the second pusher 8 is controlled under the control of the controller 15, thereby controlling the marking depth.

[0033] Further, see Figure 3 , 4 The positioning component 3 and the adjusting component 4 are respectively provided with a first placement groove 22 and a second placement groove 23 whose size decreases in the direction away from the dotting component 2; the limiting component 9 is installed in the second placement groove 23.

[0034] Preferably, the positioning component 3 and the adjusting component 4 are both V-shaped structures, and the positioning component 3 and the adjusting component 4 can be made of right-angled angle steel; the first placement groove 22 and the second placement groove 23 are V-shaped grooves.

[0035] Preferably, the first pusher 6 is mounted on the support plate 101.

[0036] Preferably, the end of the positioning member 3 away from the adjusting member 4 is provided with a baffle 24 located in the first placement groove 22, and the vertical extension line of the end face of the positioning member 3 near the adjusting member is tangent to the side of the dotted steel column 202 closest to the transmission wheel 5.

[0037] Preferably, the limiting member 9 is an electric push rod, and the output end of the limiting member 9 is provided with a limiting plate 25 that slides within the first placement groove 22.

[0038] Preferably, an adjusting plate 26 is slidably provided inside the positioning member 3, and a screw hole is provided on the baffle 24. A screw 27 is threaded into the screw hole, and one end of the screw 27 is rotatably connected to the adjusting plate 26. By rotating the screw 27, the adjusting plate 26 is pushed to move within the first placement groove 22, thereby accommodating metal specimens with different end lengths. By rotating the screw 27, the adjusting plate 26 is pushed to move within the first placement groove 22, thereby adjusting the length of the first placement groove 22. The limiting member 9 pushes the limiting plate 25 to move, adjusting the length of the second placement groove 23, thereby enabling the placement of metal specimens with different end lengths.

[0039] In the above setup, both ends of the metal specimen to be marked are placed in the first placement groove 22 and the second placement groove 23, respectively. The end of the metal specimen located in the first placement groove 22 is abutted against the adjusting plate 26. According to the length of the metal specimen, the position of the adjusting member 4 is moved under the action of the first pushing member 6, thereby adjusting the distance between the adjusting member 4 and the positioning member 3, so that the original gauge length segment of the metal specimen is located in the gap between the positioning member 3 and the adjusting member 4 (that is, both ends of the metal specimen are located in the first placement groove 22 and the second placement groove 23, respectively, and the segment of the metal specimen to be marked is in a suspended state). Under the action of the first pushing member 6, the limiting plate 25 is pushed to abut against the end of the metal specimen located in the second placement groove 23, thereby fixing the metal specimen in the first placement groove 22 and the second placement groove 23. The vertical extension line of the end face of the positioning member 3 near the adjusting member is tangent to the side of the marking steel column 202 closest to the transmission wheel 5, so that the marking steel column 202 near the transmission wheel 5 is located at one end of the metal specimen, which facilitates marking. This determines the starting point for marking the metal specimen, making it easier to divide the original gauge length of the metal specimen into 10 equal grids for marking.

[0040] Further, see Figure 1 , 5 The support platform 1 is provided with a slide plate 28, and the slide plate 28 is provided with two sets of sliding grooves 29 at intervals; the first measuring component 10 is installed on the slide plate 28, and the extension line of the first measuring component 10 in the vertical direction is tangent to the end of the positioning component 3 facing the adjusting component 4; the second measuring component 11 and the third measuring component 12 are respectively installed in the two sets of sliding grooves 29.

[0041] Preferably, the radial direction of the groove 29 is parallel to the radial direction of the first placement groove 22 and the second placement groove 23.

[0042] Preferably, both the first adjusting element 13 and the second adjusting element 14 are electric push rods and are electrically connected to the controller 15. The first adjusting element 13 and the second adjusting element 14 drive the second measuring element 11 and the third measuring element 12 to move toward or away from the first measuring element 10. During the movement of the first measuring element 10 and the third measuring element 12, the controller 15 controls the movement speed of the second adjusting element 14 to be twice that of the first adjusting element 13, so that the distance between the first measuring element 10 and the second measuring element 11 is consistent with the distance between the second measuring element 11 and the third measuring element 12. Thus, when measuring an external metal specimen, the first measuring element 10 and the third measuring element 12 are located at the two ends of the metal specimen, and the second measuring element 11 is located in the middle of the metal specimen.

[0043] Further, see Figure 5 The first diameter measuring component 10 includes a first sliding sleeve 1001, a first measuring component 1002 disposed within the first sliding sleeve 1001, and a first forward pushing component 1003 and a first backward pushing component 1004 respectively disposed at both ends of the first sliding sleeve 1001. The first forward pushing component 1003 and the first backward pushing component 1004 are respectively connected to the first measuring component 1002. Under the action of external force, the first forward pushing component 1003 and the first backward pushing component 1004 push the first measuring component 1002 to clamp the external metal specimen. The second diameter measuring component 11 includes a second sliding sleeve 1101, a second measuring component 1102 disposed within the second sliding sleeve 1101, and a second forward pushing component 1103 and a second backward pushing component 1104 respectively disposed at both ends of the second sliding sleeve 1101. The second front pusher 1103 and the second rear pusher 1104 are respectively connected to the second measuring element 1102. Under the action of external force, the second front pusher 1103 and the second rear pusher 1104 push the second measuring element 1102 to clamp the external metal specimen. The third diameter measuring element 12 includes a third sliding sleeve 1201, a third measuring element 1202 disposed in the third sliding sleeve 1201, and a third front pusher 1203 and a third rear pusher 1204 disposed at both ends of the third sliding sleeve 1201. The third front pusher 1203 and the third rear pusher 1204 are respectively connected to the third measuring element 1202. Under the action of external force, the third front pusher 1203 and the third rear pusher 1204 push the third measuring element 1202 to clamp the external metal specimen.

[0044] Preferably, the first sliding sleeve 1001, the second sliding sleeve 1101, and the third sliding sleeve 1201 are all elongated structures, and each of the first sliding sleeve 1001, the second sliding sleeve 1101, and the third sliding sleeve 1201 is provided with a groove, which passes through both ends of the first sliding sleeve 1001, the second sliding sleeve 1101, and the third sliding sleeve 1201.

[0045] Preferably, the bottom ends of the second sliding sleeve 1101 and the third sliding sleeve 1201 are provided with sliders 31 located in the two sets of sliding grooves 29 respectively.

[0046] Preferably, the first measuring element 1002, the second measuring element 1102, and the third measuring element 1202 are all existing digital micrometers. To facilitate reading, the digital display part on the digital micrometer can be removed and installed on the support plate 101. The digital display part and the digital micrometer are connected by a cable. This part can be achieved by existing technology and will not be described in detail in this application.

[0047] Preferably, the first front pusher 1003 and the first rear pusher 1004, the second front pusher 1103 and the second rear pusher 1104, the third front pusher 1203 and the third rear pusher 1204 are all electric push rods, and are all electrically connected to the controller 15 respectively.

[0048] Preferably, each of the two sets of measuring ends of the digital micrometer in the first sliding sleeve 1001, the second sliding sleeve 1101, and the third sliding sleeve 1201 can be equipped with a touch limit switch 30. When the two sets of measuring ends of the digital micrometer are in contact with the outer wall of the external metal specimen, the controller 15 controls the first forward pusher 1003, the first backward pusher 1004, the second forward pusher 1103, the second backward pusher 1104, the third forward pusher 1203, and the third backward pusher 1204 to stop working.

[0049] In the above setup, after placing both ends of the metal specimen in the first placement slot 22 and the second placement slot 23 respectively, the original gauge length of the metal specimen is suspended. The controller 15 controls the first adjusting element 13 and the second adjusting element 14 to move the second measuring element 11 and the third measuring element 12 away from the first measuring element 10. The first measuring element 10 is located at the end of the metal specimen near the first placement slot 22, used to measure the outer diameter at that position. After the second measuring element 11 moves, it is located in the middle of the metal specimen, and after the third measuring element 12 moves, it is located in the middle of the metal specimen. Near one end of the second placement slot 23, used to measure the outer diameter at that position, the movement distance of the second measuring element 11 and the third measuring element 12 can be controlled by an external control switch (i.e., by the operator checking the movement position of the third measuring element 12 and disconnecting the power supply, or by setting a first limit rod on the end of the adjusting element 4 near the positioning element 3, and setting a second limit rod on the third slide 29, with a limit switch on the second limit rod; when the limit switch on the second limit rod abuts against the first limit rod, the controller 15 disconnects the first adjusting element 13 and the second adjusting element 12). (Power supply of component 14); after the first measuring component 10, the second measuring component 11, and the third measuring component 12 are respectively located at both ends and the middle of the metal specimen, the controller 15 controls the first forward push component 1003, the first backward push component 1004, the second forward push component 1103, the second backward push component 1104, the third forward push component 1203, and the third backward push component 1204 to work. The first forward push component 1003 and the first backward push component 1004 respectively push the two ends of the digital micrometer in the first sliding sleeve 1001 toward the outer wall of the metal specimen, and obtain the metal... The outer diameter of the specimen near the positioning member 3 is vertical; the second front push member 1103 and the second rear push member 1104 respectively push the two ends of the digital micrometer in the second sliding sleeve 1101 toward the outer wall of the metal specimen, and obtain the outer diameter value of the middle part of the metal specimen; the third front push member 1203 and the third rear push member 1204 respectively push the two ends of the digital micrometer in the third sliding sleeve 1201 toward the outer wall of the metal specimen, and obtain the outer diameter value of the metal specimen near the adjusting member 4, thus obtaining that the outer diameters of the two ends and the middle part of the metal specimen are vertical.

[0050] It should be noted that in this embodiment, the controller 15, limit switch 16, limit switch, hydraulic push rod, and electric push rod are existing structures. No improvements are proposed to their structures in this embodiment. The digital micrometer is also an existing structure. The only difference is that the display part is moved to the support platform 1 for easier observation of the measurement values.

[0051] In this embodiment, by placing the metal specimen in the first placement slot 22 and the second placement slot 23, and fixing the metal specimen in the first placement slot 22 and the second placement slot 23 under the action of the first pushing member 6, the original gauge length section of the metal specimen is in a suspended state. The two sets of measuring ends of the digital micrometer used to measure the outer diameter of the metal specimen are respectively located on both sides of the metal specimen. After the positions of the three sets of digital micrometers are adjusted and located at both ends and the middle of the metal specimen, the three sets of digital micrometers measure the outer diameter values ​​of both ends and the middle of the metal specimen at one time. It is more convenient. Of course, since the three sets of digital micrometers are installed in the first sliding sleeve 1001, the second sliding sleeve 1101, and the third sliding sleeve 1201 respectively, when the outer walls of the first sliding sleeve 1001, the second sliding sleeve 1101, and the third sliding sleeve 1201 are in contact, that is, when the distance between the three sets of digital micrometers is the smallest, it is the minimum value of the original gauge length of the metal specimen that this application can measure. After the outer diameter of the metal specimen is measured, the controller 15 controls the measuring ends of the three sets of digital micrometers to move away from each other, and marks the original gauge length of the metal specimen through the marking steel column 202.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gauge length device for tensile testing of metal specimens, characterized in that, include: The dotting and marking assembly includes a support platform (1), a dotting element (2) rotatably mounted on the support platform (1), a positioning element (3) and an adjusting element (4) mounted on the support platform (1); the support platform (1) is provided with a transmission wheel (5) and a first pusher (6) spaced apart, one of the transmission wheels (5) is connected to a transmission element (7), and a support crossbar (19) is provided on the transmission wheel (5); a second pusher (8) is provided on the support crossbar (19); the dotting element (2) is mounted on the second pusher (8); the transmission element (7) meshes with the transmission wheel (5) under the action of external force, so that the transmission element (7) and the dotting element (2) rotate along the axial direction of the positioning element (3); The second pusher (8) moves back and forth under the action of external force so that the dotting part (2) moves back and forth toward the center line of the positioning part (3); the adjusting part (4) has the same shape as the positioning part (3) and the extension line of the center line coincides. The adjusting part (4) is installed on the first pusher (6) and the adjusting part (4) is provided with a limiting part (9); the first pusher (6) moves back and forth in the horizontal direction under the action of external force so that the adjusting part (4) moves back and forth in the direction toward or away from the positioning part (3), thereby adjusting the distance between the adjusting part (4) and the positioning part (3) so that the original gauge length segment of the metal specimen is located in the gap between the positioning part (3) and the adjusting part (4); The diameter measuring assembly includes a first diameter measuring element (10), a second diameter measuring element (11), and a third diameter measuring element (12) spaced below the positioning element (3), and a first adjusting element (13) and a second adjusting element (14) mounted on the support platform (1) and connected to the second diameter measuring element (11) and the third diameter measuring element (12) respectively. The first adjusting element (13) and the second adjusting element (14) operate under external force to drive the second diameter measuring element (11) and the third diameter measuring element (12) toward or away from the first diameter measuring element (10) respectively. The working speed of the second adjusting element (14) is twice that of the first adjusting element (13) so that the moving speed of the third diameter measuring element (12) is twice that of the second diameter measuring element (11). The first diameter measuring element (10), the second diameter measuring element (11), and the third diameter measuring element (12) are used to measure the outer diameter of the external metal specimen respectively. The control components include a controller (15) and a limiter (16) mounted on a support platform (1); the controller (15) is electrically connected to a first pusher (6), a transmission component (7), a second pusher (8), a first adjusting component (13), a second adjusting component (14), and a limiter (16).

2. The gauge length device for tensile testing of metal specimens according to claim 1, characterized in that: The support platform (1) is provided with support plates (17) spaced apart; the support plates (17) are provided with rotating shafts (18); the transmission wheel (5) is rotatably mounted on the rotating shafts (18).

3. The gauge length device for tensile testing of metal specimens according to claim 2, characterized in that: The dotting component (2) includes a dotting sleeve (201) and multiple sets of dotting steel columns (202) spaced apart inside the dotting sleeve (201); the dotting sleeve (201) is fixedly connected to the second pusher (8); a protective cover (20) is provided on the support plate (17); the limiter (16) is installed on the protective cover (20); the support crossbar (19) abuts against the limiter (16) under the rotation of the transmission wheel (5) so that the extension line of the dotting steel column (202) in the axial direction intersects perpendicularly with the center line of the positioning component (3).

4. The gauge length device for tensile testing of metal specimens according to claim 3, characterized in that: The thickness of the support crossbar (19) is the same as the thickness of the dotting sleeve (201); the dotting steel column (202) is installed at the center of the dotting sleeve (201); the horizontal distance from the end face of the limiter (16) toward the support crossbar (19) to the center line of the positioning member (3) is the same as the distance from the outer wall of the dotting sleeve (201) to the axis of the dotting steel column (202).

5. The gauge length device for tensile testing of metal specimens according to claim 4, characterized in that: The positioning member (3) and the adjusting member (4) are respectively provided with a first placement groove (22) and a second placement groove (23) whose size decreases in the direction away from the dotting member (2); the limiting member (9) is installed in the second placement groove (23).

6. The gauge length device for tensile testing of metal specimens according to claim 5, characterized in that: The positioning member (3) is provided with a baffle (24) located in the first placement groove (22) at the end away from the adjustment member (4). The vertical extension line of the end face of the positioning member (3) near the adjustment member is tangent to the side of the spotting steel column (202) closest to the transmission wheel (5).

7. The gauge length device for tensile testing of metal specimens according to claim 6, characterized in that: The support platform (1) is provided with a sliding plate (28); the sliding plate (28) is provided with two sets of sliding grooves (29) at intervals; the first measuring component (10) is installed on the sliding plate (28), and the extension line of the first measuring component (10) in the vertical direction is tangent to the end of the positioning component (3) facing the adjustment component (4); the second measuring component (11) and the third measuring component (12) are respectively installed in the two sets of sliding grooves (29).

8. The gauge length device for tensile testing of metal specimens according to claim 7, characterized in that: The radial direction of the groove (29) is parallel to the radial directions of the first placement groove (22) and the second placement groove (23).

9. A gauge length device for tensile testing of metal specimens according to claim 8, characterized in that: The first diameter measuring component (10) includes a first sliding sleeve (1001), a first measuring component (1002) disposed within the first sliding sleeve (1001), and a first forward pusher (1003) and a first backward pusher (1004) respectively disposed at both ends of the first sliding sleeve (1001); the first forward pusher (1003) and the first backward pusher (1004) are respectively connected to the first measuring component (1002), and the first forward pusher (1003) and the first backward pusher (1004) push the first measuring component (1002) to clamp the external metal specimen under the action of external force; the second diameter measuring component (11) includes a second sliding sleeve (1101), a second measuring component (1102) disposed within the second sliding sleeve (1101), and a second forward pusher (1103) and a second backward pusher (1104) respectively disposed at both ends of the second sliding sleeve (1101); The second forward pusher (1103) and the second backward pusher (1104) are respectively connected to the second measuring element (1102). Under the action of external force, the second forward pusher (1103) and the second backward pusher (1104) push the second measuring element (1102) to clamp the external metal specimen. The third diameter measuring element (12) includes a third sliding sleeve (1201), a third measuring element (1202) disposed in the third sliding sleeve (1201), and a third forward pusher (1203) and a third backward pusher (1204) disposed at both ends of the third sliding sleeve (1201). The third forward pusher (1203) and the third backward pusher (1204) are respectively connected to the third measuring element (1202). Under the action of external force, the third forward pusher (1203) and the third backward pusher (1204) push the third measuring element (1202) to clamp the external metal specimen.

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