Stretcher clamp

Abstract

The utility model discloses a stretcher clamp which comprises a clamp body, a clamping arm, a driving block, a threaded column, a positioning assembly, a connecting rod and a measuring assembly, and a containing groove is formed in the middle of the clamp body. The two clamping arms are symmetrically arranged in the containing groove of the clamp body. The driving block is rotationally connected with the upper ends of the two clamping arms; the threaded column penetrates through the clamp body and is fixedly connected with the driving block in the containing groove. The positioning assembly is installed on the clamp body and matched with the two clamping arms. The upper end of the connecting rod is rotationally connected with the threaded column; the measuring assembly is located below the clamping arm, and the measuring assembly is in sliding connection with the lower end of the connecting rod. The stretcher clamp has the advantages of high-precision data acquisition, error accumulation reduction, working efficiency improvement and multi-data synchronous measurement, can capture tiny changes of the thickness and the cross sectional area of a material in the stretching process, and provides accurate data support for researching physical characteristics such as the Poisson's ratio of the material.

Description

TECHNICAL FIELD

[0001] The utility model belongs to material testing equipment technical field, specifically relates to a tensile machine clamp. BACKGROUND

[0002] Traditional tensile machine clamp mainly focuses on the stable clamping function of the sample to ensure that the sample does not slip or fall off during the stretching process. Its structure is relatively simple, usually composed of fixed chuck and movable chuck, and the opening and closing action of the chuck is realized by manual or simple mechanical driving mode to clamp the sample.

[0003] In terms of measurement, the traditional clamp has almost no measurement capability for key geometric parameters such as sample thickness and cross-sectional area. Before the tensile test, the operator needs to use independent measuring tools such as calipers and micrometers to measure the sample. This method has many drawbacks such as complicated operation, large human error, and inability to monitor in real time.

[0004] With the improvement of the requirement of material testing accuracy, some improved technologies have emerged, but there are still certain limitations.

[0005] Firstly, the existing automatic processing equipment for realizing the feeding and processing of experimental samples has low precision and stability when clamping the cross beam parts due to the complex structure of the experimental samples and the large number of processes, which can easily cause the cross beam parts to deviate and error during manual measurement and experimental operation, resulting in data deviation. For example, the CN202411253187.6 patent clamps the sample to control the distance, but lacks analysis of clamping force and position accuracy, and has problems such as inaccurate experimental material damage position in high-precision experiments.

[0006] Secondly, some studies try to integrate a single type of sensor on the clamp to measure a certain specific parameter. Although this design can achieve automatic measurement of the specific parameter to a certain extent, it is far from enough to fully understand the geometric characteristics of the material. Because the mechanical properties of the material are closely related to multiple geometric parameters such as cross-sectional area, measuring a single parameter cannot accurately evaluate the stress-strain relationship of the material during the stretching process and other related performance indicators. Moreover, the measurement system of a single sensor is often not perfect in data calibration, environmental compensation, etc., and is easily affected by external factors, affecting the stability of measurement accuracy.

[0007] Meanwhile, some high-precision material testing laboratories use very complex and expensive measuring systems, such as high-precision laser interferometers, three-dimensional profile scanners, and the like, in cooperation with a tensile machine. These systems can achieve very precise measurement of thickness, cross-sectional area, and the like, but they have problems such as high equipment cost, high operation and maintenance requirements, large floor space, and the like, and are not suitable for most ordinary material testing scenarios and quality control links in industrial production, limiting their widespread application. Utility Model Content

[0008] In order to solve the above problems, the utility model provides a tensile machine clamp.

[0009] The tensile machine clamp of the utility model, comprising: a clamp main body, the middle of the clamp main body is provided with a containing groove; two clamping arms are symmetrically arranged in the containing groove of the clamp main body; a driving block is located in the containing groove, and the driving block is rotatably connected to the upper ends of the two clamping arms; a threaded column penetrates through the clamp main body and is fixedly connected with the driving block inside the containing groove; a positioning assembly is installed on the clamp main body and cooperates with the two clamping arms; the upper end of a connecting rod is rotatably connected with the threaded column; a measuring assembly is located below the clamping arm and is slidably connected with the lower end of the connecting rod.

[0010] Optionally, the bottom of the containing groove is open, the clamping arms located therein correspond to the measuring assembly below, and the containing groove is wide at the top and narrow at the bottom, and the two sides of the containing groove are inclined from the outside to the inside.

[0011] Optionally, the driving block is disc-shaped, the clamping arms are wedge key-shaped and wide at the top and narrow at the bottom, the upper part of the clamping arm is provided with a clamping groove with a side opening, the clamping grooves on the two clamping arms are oppositely arranged, the opening between the top of the two clamping grooves is smaller than the diameter of the driving block, and the driving block is clamped in the clamping grooves of the two clamping arms. The side of the wedge key-shaped clamping arm in contact with the clamp main body is an inclined surface, and the corresponding side of the two clamping arms is a vertical surface.

[0012] Optionally, rotating rods are rotatably connected to the outer sides of the clamping arms, shafts are connected to the sides of the rotating rods close to the clamp main body, through holes are formed in the corresponding positions of the two side edges of the clamp main body, bearings are fixedly arranged in the through holes, the shafts cooperate with the bearings in the through holes, and the two clamping arms are rotatably installed on the clamp main body through the shafts.

[0013] Optionally, a threaded hole is formed in the top of the clamp main body for the threaded column to pass through, the threaded column cooperates with the threaded hole, and a rotating handle is further installed on the threaded column above the clamp main body.

[0014] Optionally, the positioning assembly comprises a fixed plate fixed outside the accommodating groove of the clamp body, a screw rod is vertically arranged on the middle of the fixed plate, the screw rod is rotationally connected with the fixed plate, a rotating handle is threadedly connected on one side of the screw rod, a bearing seat is arranged on the other side of the fixed plate, a bearing is arranged on the other end of the screw rod, and the bearing is rotationally connected with the bearing seat.

[0015] Optionally, the positioning plate is plate-shaped, and the positioning plate is arranged between the two clamping arms, and the bottom of one of the clamping arms is provided with an infrared sensor.

[0016] Optionally, the connecting rod is U-shaped, a circular ring is connected to the upper end of the connecting rod, the circular ring is rotationally arranged on a threaded column arranged on the top of the clamp body, and a first sliding groove is arranged on the lower end of the connecting rod, and the measuring assembly is slidably connected with the connecting rod through the first sliding groove.

[0017] Optionally, the measuring assembly comprises a T-shaped rod, one end of the T-shaped rod is provided with a first sliding block matched with the first sliding groove on the connecting rod, and the other end of the T-shaped rod is provided with a second sliding groove.

[0018] Optionally, the measuring assembly further comprises a first grating measuring head and a second grating measuring head arranged side by side, the first grating measuring head and the second grating measuring head are both perpendicular to the second sliding groove, and the first grating measuring head and the second grating measuring head are both slidably connected with the second sliding groove, a third grating measuring head is slidably arranged above the second grating measuring head, and the third grating measuring head is perpendicular to the first grating measuring head and the second grating measuring head.

[0019] The clamp of the utility model has the advantages of being capable of acquiring sample data in real time and accurately during the stretching process, the measurement accuracy can reach the micron level, and the initial size data can be provided more accurately for the stretching test of some materials (such as high-precision alloy materials, microelectronic materials and the like) with extremely high size requirements, so as to provide reliable basis for subsequent stress-strain calculation and the like.

[0020] 1. The clamp of the utility model can acquire data continuously under the same measurement system, reduces error accumulation caused by factors such as measurement tools, measurement personnel and measurement environment changes, and makes the data in the whole stretching test process more coherent and accurate.

[0021] 2. The clamp of the utility model can acquire data continuously under the same measurement system, reduces error accumulation caused by factors such as measurement tools, measurement personnel and measurement environment changes, and makes the data in the whole stretching test process more coherent and accurate.

[0022] 3.The clamp can immediately start measuring related data after the material sample is installed, without the need for manual additional measurement steps. When performing batch material tensile tests, the automatic measurement clamp can complete the accurate measurement of the initial size within a few seconds. Moreover, data can be recorded in real time during the stretching process, without the need to pause the test for manual measurement, greatly shortening the test cycle. This can significantly improve work efficiency for research and development projects that require rapid acquisition of a large amount of material performance data (such as new material screening and optimization, etc.). In addition, the clamp of the utility model is combined with the automatic tensile machine control system to realize automatic control and data acquisition of the entire tensile test process. After setting the tensile speed, tensile force and other parameters, the clamp automatically measures and records the data, and when the test is completed, the data can be directly transmitted to the computer for analysis and processing, reducing the manual intervention link and improving the overall automation level and efficiency of the test.

[0023] 4.The clamp of the utility model can accurately measure multiple data such as thickness and cross-sectional area at the same time, rather than using different tools and methods to measure different size parameters as in the traditional way. During the stretching process, it can synchronously obtain data such as thickness change, cross-sectional area change and tensile force of the material at each time node, so that the correlation between these data can be more clearly exhibited. This helps researchers more comprehensively analyze the mechanical properties of the material, and through synchronous measurement, reduces the time for data matching and calibration caused by asynchronous measurement, further improving the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the utility model.

[0025] Figure 2 is a structural schematic diagram of the positioning assembly of the utility model.

[0026] Figure 3 is a structural schematic diagram of the measurement assembly of the utility model.

[0027] Figure 4 is an internal algorithm flowchart of the display screen of the utility model.

[0028] REFERENCE SIGNS:

[0029] Clamp body 1; threaded column 2; driving block 3; clamping arm 4; positioning assembly 5; fixed plate 501; screw rod 502; rotating handle 503; bearing seat 504; positioning plate 505; infrared sensor 6; connecting rod 7; measurement assembly 8; T-shaped rod 801; first grating measurement head 802; second grating measurement head 803; third grating measurement head 804; display screen 9; rotating handle 10. DETAILED DESCRIPTION

[0030] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model and cannot be understood as a limitation of the utility model.

[0031] As Figures 1-4 The utility model discloses a stretcher fixture, including fixture main body 1, clamping arm 4, drive block 3, threaded column 2, positioning assembly 5, connecting rod 7 and measuring assembly 8. The middle of fixture main body 1 is provided with containing groove;Containing groove is provided with clamping arm 4, drive block 3 and positioning assembly 5, and the lower portion of containing groove is provided with measuring assembly 8.

[0032] The bottom of containing groove is open, the clamping arm 4 located in it corresponds with the measuring assembly 8 below, and containing groove is wide on the top and narrow on the bottom, and the two sides of containing groove are inclined from outside to inside.

[0033] Clamping arm 4 has two, and is symmetrically arranged in the containing groove of fixture main body 1;Clamping arm 4 is wedge key shape wide on the top and narrow on the bottom, and the side of wedge key shape clamping arm 4 in contact with fixture main body 1 is inclined, and the side corresponding to two clamping arms 4 is vertical. The side of clamping arm 4 inclined is smooth, and the side of vertical is rough, the smooth side is convenient for moving along the inner wall of clamping main body 1, and the rough side is convenient for clamping sample, and increases friction. The two clamping arms 4 are used for clamping sample between them.

[0034] The outer side of two clamping arms 4 is rotatably connected with rotating rod, the side close to fixture main body 1 of rotating rod is connected with shaft, the both sides of the inner side of fixture main body 1 are all provided with through hole on the corresponding position, the bearing is fixed in the through hole, and the shaft is matched with the bearing in the through hole, and two clamping arms 4 are rotatably installed on fixture main body 1 through the shaft.

[0035] Drive block 3 is located in containing groove, and the upper end of drive block 3 is rotatably connected with two clamping arms 4;Specifically, drive block 3 is disc shape, the upper part of clamping arm 4 is provided with the clamping groove with side opening, the clamping groove on two clamping arms 4 is oppositely arranged, the opening between the top of two clamping grooves is less than the diameter of drive block 3, drive block 3 is clamped in the clamping groove of two clamping arms 4, and the thickness of drive block 3 is slightly less than the height of clamping groove, so that drive block 3 can rotate relative to the clamping groove in clamping arm 4.

[0036] The top of fixture main body 1 is provided with the threaded through hole for threaded column 2 to pass through, and threaded column 2 is matched with threaded through hole, and rotating handle 10 is also installed on the threaded column 2 above fixture main body 1. Rotating rotating handle 10 can drive threaded column 2 to move up and down in fixture main body 1.

[0037] The threaded column 2 penetrates the clamp body 1 and is fixedly connected with the driving block 3 inside the accommodating groove, and the driving block 3 can also be said to be integrated with the threaded column 2; when the threaded column 2 rotates, the driving block 3 will be driven to rotate in the accommodating groove, and the rotation of the threaded column 2 will drive the driving block 3 to move up and down in the accommodating groove, and the up-and-down movement of the driving block 3 will drive the clamping arm 4 to move up and down in the accommodating groove, and the clamping arm 4 can also move left or right along the inclined surface of the inner wall of the accommodating groove while moving up and down, so as to change the tightness of the clamping of the sample.

[0038] Next, how to change the tightness of the clamping of the sample will be described in detail.

[0039] When the rotating handle 10 is counterclockwise rotated, the driving block 3 moves upward with the threaded column 2, thereby driving the clamping arm 4 to move upward, and the clamping arm 4 will also move left or right along the inclined surface of the accommodating groove while moving upward, and the vertical surfaces, i.e. the rough surfaces, of the two clamping arms 4 move away from each other, thereby loosening the clamping of the sample; when the rotating handle 10 is clockwise rotated, the driving block 3 moves downward with the threaded column 2, thereby driving the clamping arm 4 to move downward, and the clamping arm 4 will move right or left along the inclined surface of the accommodating groove while moving downward, and the vertical surfaces, i.e. the rough surfaces, of the two clamping arms 4 move close to each other, thereby tightening the clamping of the sample.

[0040] The positioning assembly 5 is installed on the clamp body 1 and cooperates with the two clamping arms 4; the positioning assembly 5 comprises a fixed plate 501 fixed outside the accommodating groove of the clamp body 1, a screw rod 502 penetrating the middle of the fixed plate 501, the screw rod 502 being perpendicular to the clamp body 1 and the fixed plate 501, the screw rod 502 being rotationally connected with the fixed plate 501, a rotating handle 503 being threadedly installed on one side of the screw rod 502, a bearing seat 504 being arranged on the other side of the fixed plate 501, a bearing being arranged on the other end of the screw rod 502, the bearing being rotationally connected with the bearing seat 504, and a positioning plate 505 being fixedly connected with the outer shell of the bearing seat 504. The positioning plate 505 is plate-shaped and is located between the two clamping arms 4, and is designed to be plate-shaped so as to avoid affecting the clamping of the clamping arm 4.

[0041] When the rotating handle 503 is clockwise rotated, the positioning plate 505 will be pushed to the side close to the two clamping arms 4, and when the rotating handle 503 is counterclockwise rotated, the positioning plate 505 will be pulled away from the clamping arms.

[0042] When the sample is placed, firstly, the sample is placed between the two clamping arms 4, and then the rotating handle 503 is rotated clockwise, the positioning plate 505 is pushed towards the clamping arms 4, and finally one side of the sample is pressed against the positioning plate 505, the other side is close to the clamping arms 4, one side of the positioning plate 505 is close to the sample, and the other side of the positioning plate 505 is also close to the other clamping arm 4, so that the positioning plate 505 is constrained. After the positioning plate 505 is fixed, the rotating handle 10 is rotated clockwise, the driving block 3 is pushed to move downward, and the two clamping arms 4 are moved downward at the same time, and the two clamping arms 4 are close to each other due to the constraint of the clamp body 1, so that the sample is clamped.

[0043] During the process that the sample is pulled by the rope on the tensile machine, the main holding force is provided by the clamping arms 4, and the positioning plate 505 only ensures that the sample does not tilt laterally. If there is no positioning plate 505 and only the clamping arms 4 clamp the sample, the initial shape of the sample may be inclined or tilted during the stretching process, thereby affecting the stretching measurement.

[0044] The clamp is generally used in a complete set, and we only need to replace one clamp in the existing tensile machine clamp with the clamp of the application, and the other clamp remains unchanged.

[0045] The bottom of one of the clamping arms 4 is provided with an infrared sensor 6 for measuring the length of the sample. In fact, the infrared sensor 6 vertically emits infrared rays which are reflected by the bottom end of the clamping arm 4 on one side of the lower clamp and then received by the infrared sensor 6. After data processing, the length of the sample to be tested is displayed on the display screen.

[0046] The clamp body 1 is also provided with a display screen 9, which is provided with an operation panel and a display panel. The operator controls the opening and closing of the clamping arms 4, the start and stop of the measurement function and the like through the operation panel. At the same time, the measurement data of each sensor in the measurement assembly 8 and the infrared sensor 6 are integrated and processed by setting an algorithm, and the length, cross-sectional area, thickness and width of the sample are displayed.

[0047] As shown in Figure 4 The specific process of the display screen 9 outputting data is as follows: the "start measurement" button on the display screen is clicked to start the measurement program, after the program runs, the sensor port waits for new measurement data to be output, and after detecting that the sensor outputs new data, the measurement data is updated and the updated data is output on the display screen.

[0048] The upper end of the connecting rod 7 is rotationally connected with the threaded column 2. Specifically, the connecting rod 7 is U-shaped, and a circular ring is connected with the upper end of the connecting rod 7, which is rotationally installed on the threaded column 2 at the top of the clamp body 1, so that the connecting rod 7 can rotate around the threaded column 2. The lower end of the connecting rod 7 is provided with a first sliding groove, and the measuring assembly 8 is slidingly connected with the connecting rod 7 through the first sliding groove. The connecting rod 7 rotates at the same time to drive the measuring assembly 8 to rotate, so as to adjust the angle of the measuring assembly 8, and then the test requirement can be adjusted.

[0049] The measuring assembly 8 is located below the clamping arm 4, and the measuring assembly 8 is slidingly connected with the lower end of the connecting rod 7.

[0050] The measuring assembly 8 comprises a T-shaped rod 801 and first and second grating measuring heads 802 and 803 arranged side by side. One end of the T-shaped rod 801 is provided with a first sliding block matched with the first sliding groove on the connecting rod 7, and the other end of the T-shaped rod 801 is provided with a second sliding groove on the side surface. The first and second grating measuring heads 802 and 803 are both perpendicular to the second sliding groove, and are both slidingly connected with the second sliding groove. The same end of the first and second grating measuring heads 802 and 803 is respectively provided with a second sliding block and a third sliding block matched with the second sliding groove. A third grating measuring head 804 is slidingly arranged above the second grating measuring head 803, and is perpendicular to the first and second grating measuring heads 802 and 803. The top end of the second grating measuring head 803 is provided with a third sliding groove, and one end of the third grating measuring head 804 close to the third sliding groove is provided with a fourth sliding block matched with the third sliding groove, and the fourth sliding block can move along the third sliding groove.

[0051] The first, second, third and fourth sliding blocks are all in the shape of a cube or a cuboid, so that the sliding blocks can only translate along the corresponding sliding grooves when moving, and will not rotate. In addition, a guide rail and a micro motor (which are prior art and will not be described in detail) can be arranged in each sliding groove to drive the sliding blocks to move.

[0052] The first and second grating measuring heads and the T-shaped rod constitute a grating sensor, and the thickness of the sample is calculated according to the difference between the readings of the first and second grating measuring heads.

[0053] The second and third grating measuring heads and the T-shaped rod constitute a grating sensor, and the width of the sample is measured.

[0054] The core of the capacitive grid sensor is a capacitive structure composed of a fixed grid and a moving grid. In the present application, the fixed grid is arranged on the inner wall of the sliding groove of the T-shaped rod 801 and the inner wall of the sliding groove of the second measuring head 803; the moving grid is arranged on the side of the second slider and the third slider of the first measuring head 802 and the second measuring head 803 opposite to the fixed grid in the T-shaped rod 801, and the side of the fourth slider of the third measuring head 804 in the second measuring head 803 sliding groove opposite to the fixed grid.

[0055] The utility model also includes data acquisition unit, data processing unit, display screen and stretcher control system, before experiment, first connect the line between data acquisition unit, data processing unit, display screen and stretcher control system, carry out system initialization setting.

[0056] Sample clamping and measurement: when the clamp of the utility model is used, the sample is placed between the two clamping arms through the display screen operation, the positioning plate is inserted between the two clamping arms to position the sample, then the two clamping arms are moved to the middle to clamp the sample, finally the infrared sensor and the measurement assembly start to measure the length, width and thickness of the sample, the measurement data is collected by the data acquisition unit and transmitted to the data processing unit for processing and analysis, and the processing result is displayed on the display screen.

[0057] Stretching test and data interaction: start the stretcher to perform the stretching test, in the test process, the data processing unit transmits the size data of the sample to the stretcher control system, and the control system adjusts the stretching parameters in real time according to the data, such as stretching speed and stretching force loading. In the test process, the measurement assembly of the clamp can continue to monitor the thickness and cross-sectional area change of the sample in the stretching process, and the data processing unit processes and stores these dynamic change data for subsequent analysis of the deformation characteristics and size change relationship of the material in the stretching process.

[0058] Test end and data storage: after the stretching test is completed, the data processing unit sorts and stores all the data of this test, including the original size data of the sample, the dynamic size change data in the stretching process and the stretching test result data. The operator can query and export these data through the operation panel for further material performance analysis and research report writing.

[0059] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0060] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0061] In the utility model, unless otherwise expressly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements or the interaction relationship between two elements, unless otherwise expressly limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0062] In the utility model, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly contacted through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0063] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that the specific feature, structure, material or characteristic being described with reference to the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the features of different embodiments or examples described in the specification and different embodiments or examples without contradiction.

[0064] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the changes, modifications, replacements and modifications of the above embodiments made by the person skilled in the art are within the protection scope of the present application.

Claims

1. A drawbench clamp characterised in that, Include: Clamp body, the middle of the clamp body is provided with a containing groove; Clamping arm, the clamping arm has two, symmetrically arranged in the containing groove of the clamp body; Driving block, the driving block is located in the containing groove, and the driving block is rotationally connected with the upper end of the two clamping arms; Screw column, the screw column penetrates the clamp body and is fixedly connected with the driving block inside the containing groove; Positioning assembly, the positioning assembly is installed on the clamp body, and is matched with the two clamping arms; Connecting rod, the upper end of the connecting rod is rotationally connected with the screw column; Measuring assembly, the measuring assembly is located below the clamping arm, and the measuring assembly is slidingly connected with the lower end of the connecting rod.

2. The tensile machine clamp of claim 1, wherein, The bottom of the containing groove is open, the clamping arm located therein corresponds to the measuring assembly below, the containing groove is wide at the top and narrow at the bottom, and the two sides of the containing groove are inclined from outside to inside.

3. The tensile machine clamp of claim 1, wherein, The driving block is disc-shaped, the clamping arm is wedge-shaped and wide at the top and narrow at the bottom, the upper part of the clamping arm is provided with a clamping groove with an open side, the clamping grooves on the two clamping arms are oppositely arranged, the opening between the top of the two clamping grooves is smaller than the diameter of the driving block, and the driving block is clamped in the clamping grooves of the two clamping arms.

4. The tensile machine clamp of claim 1, wherein, The outer side of the two clamping arms is rotationally connected with a rotating rod, the side close to the clamp body of the rotating rod is connected with a shaft, the two sides of the clamp body are provided with through holes at the corresponding positions, bearings are fixedly arranged in the through holes, the shaft is matched with the bearings in the through holes, and the two clamping arms are rotationally installed on the clamp body through the shaft.

5. The tensile machine clamp of claim 1, wherein, The top of the clamp body is provided with a threaded hole through which the threaded column passes, the threaded column is matched with the threaded hole, and a rotating handle is further installed on the threaded column above the clamp body.

6. The tensile machine clamp of claim 1, wherein, The positioning assembly comprises a fixed plate fixed outside the containing groove of the clamp body, a screw rod penetrating the fixed plate is arranged in the middle of the fixed plate, the screw rod is perpendicular to the clamp body and the fixed plate, the screw rod is rotationally connected with the fixed plate, a rotating handle is threadedly installed on one side of the screw rod, a bearing seat is arranged on the other side of the fixed plate, a bearing is arranged at the other end of the screw rod, the bearing is rotationally connected with the bearing seat, and the shell of the bearing seat is fixedly connected with a positioning plate.

7. The tensile machine clamp of claim 6, wherein, The positioning plate is plate-shaped, and the positioning plate is located between the two clamping arms; the bottom of one of the clamping arms is provided with an infrared sensor.

8. The tensile machine clamp of claim 1, wherein, The connecting rod is U-shaped, a circular ring is connected to the upper end of the connecting rod, the circular ring is rotationally installed on the threaded column at the top of the clamp body, a first sliding groove is arranged at the lower end of the connecting rod, and the measuring assembly is slidingly connected with the connecting rod through the first sliding groove.

9. The tensile machine clamp of claim 8, wherein, The measuring assembly comprises a T-shaped rod, one end of the T-shaped rod is provided with a first sliding block matched with the first sliding groove on the connecting rod, and the other end side of the T-shaped rod is a second sliding groove.

10. The drawbench clamp of claim 9 wherein, The measuring assembly further comprises a first grating measuring head and a second grating measuring head arranged side by side, the first grating measuring head and the second grating measuring head are perpendicular to the second sliding groove, and the first grating measuring head and the second grating measuring head are slidingly connected with the second sliding groove; a third grating measuring head is slidingly arranged above the second grating measuring head, and the third grating measuring head is perpendicular to the first grating measuring head and the second grating measuring head.

Images