Aluminum bar tension testing device

Abstract

The utility model relates to an aluminum bar tension testing device, which comprises a tension piece and two clamp pieces, the tension piece is provided with a fixed end and a tensioning end, one clamp piece is fixed at the fixed end of the tension piece, the other clamp piece is fixed at the tensioning end of the tension piece, and the tension piece is provided with a fixed end and a tensioning end. Each of the two clamping pieces comprises a clamping seat, a clamping piece and a clamping piece, and the clamping pieces are symmetrically connected to the two sides of the clamping seat; the clamping pieces are symmetrically connected to the two sides of the clamping base, abut against the clamping pieces and are used for continuously clamping the clamping pieces in the clamping process. The technical scheme has the beneficial technical effects that one of the two clamping seats is fixedly connected to the fixed end of the tension piece, and the other clamping seat is fixedly connected to the tensioning end of the tension piece. And the clamping piece is used for clamping the aluminum bar. The clamping piece is used for continuously clamping the clamping piece in the clamping process, so that the clamping stability in the pulling-up process is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of aluminum rod testing, specifically to an aluminum rod tensile testing device. Background Technology

[0002] Aluminum is a lightweight metal with unique chemical and physical properties. Aluminum materials are lightweight and have good ductility, making them an important basic raw material for economic development.

[0003] Aluminum bars are a type of aluminum product. The casting of aluminum bars includes the processes of melting, purification, impurity removal, degassing, slag removal, and casting. An important step in the aluminum bar casting process is the tensile testing. This involves mounting the aluminum bar sample in the fixture of a tensile testing machine, starting the machine, and applying tensile force until the sample breaks or reaches a preset maximum tensile force value. During this process, key data such as tensile force and displacement are recorded. The fracture morphology of the sample is observed and recorded to analyze the tensile strength, elongation, and other mechanical properties of the aluminum bar.

[0004] Existing technology CN219573766U provides a tensile testing instrument that uses upper and lower clamps to hold the sample and improves detection accuracy by setting a scale, thereby completing the detection of the tensile force of the clamped sample. However, the existing technology uses a flat clamp to hold the aluminum rod, which can easily cause the aluminum rod to deform. During the entire tensile process, if the aluminum material deforms, the unstable clamping can easily lead to inaccurate test data.

[0005] Therefore, it is very necessary to provide an aluminum rod tensile testing device to solve the above-mentioned technical problems. Utility Model Content

[0006] Based on the above description, this utility model provides an aluminum rod tensile testing device to solve the problems of existing flat-jaw clamps that easily cause deformation of aluminum materials and uneven clamping force, resulting in inaccurate test data.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A tensile testing device for aluminum bars includes a tensile component and a clamping component. The tensile component has a fixed end and a tensioning end. There are two clamping components, one of which is fixed to the fixed end of the tensile component and the other is fixed to the tensioning end of the tensile component. Both include a clamping seat, a clamping component, and a locking component. A set of clamping components is provided, symmetrically connected to both sides of the clamping seat, for clamping both sides of the aluminum bar. A set of locking components is provided, symmetrically connected to both sides of the clamping seat and abutting against the clamping component, for continuously locking the clamping component during the clamping process.

[0008] Furthermore, the tensioning component includes a support base, a support frame, a support slider, and a driving component. The support frame is in the shape of an inverted U and is fixed to the support base. The cavity of the inverted U-shaped support frame is hollow and has several through slots that communicate with the cavity of the support frame. A set of support sliders is provided and is slidably connected to the support frame. The driving component is located in the cavity of the support frame and is used to drive the support sliders.

[0009] Furthermore, the driving component includes a rotating screw, a supporting nut, a driving bracket, and a driving motor. The rotating screw is rotatably connected to the U-shaped inner cavity of the support frame. The inner ring of the supporting nut is threadedly connected to the rotating screw. The driving bracket passes through the through slot, with one end fixedly connected to the supporting nut and the other end fixedly connected to the supporting slider. The driving motor has a fixed end and a rotating end. The fixed end of the driving motor is fixed inside the support base, and the rotating end of the driving motor is fixedly connected to the rotating screw.

[0010] Furthermore, it also includes two support connecting rods, which are symmetrically arranged on both sides of the clamping seat at the tension end of the tension member. One end of each support connecting rod is fixedly connected to the support slider, and the other end is connected to the clamping seat at the tension end of the tension member.

[0011] Furthermore, the clamping seat is hollow inside, and the clamping seat is provided with a first transverse slide groove, a second transverse slide groove, a first oblique slide groove and a second oblique slide groove.

[0012] Furthermore, the clamping component includes a clamping block and a clamping guide rod. One side of the clamping block is arc-shaped, and the arc surface of the clamping block is used to clamp the aluminum rod. There are two clamping guide rods, which are respectively fixed to both sides of the clamping block, and the clamping guide rods are slidably connected to the second inclined slide groove.

[0013] Furthermore, the clamping component includes a trapezoidal clamping block and a clamping guide rod, the trapezoidal clamping block abutting against the clamping block; two clamping guide rods are provided, the two clamping guide rods are respectively fixed on both sides of the trapezoidal clamping block, and the clamping guide rods are slidably connected to the first inclined sliding groove.

[0014] Furthermore, it also includes a pressure sensor, one end of which abuts against the clamping block and the other end of which abuts against the trapezoidal block, for detecting the pressure between the clamping block and the trapezoidal block.

[0015] Furthermore, the clamping component also includes a clamping block, a first gear, a clamping screw, a second gear, and a third gear. The clamping block is fixed on the clamping seat and is L-shaped. The first gear is horizontally mounted on the L-shaped clamping block. One end of the clamping screw is fixedly connected to the trapezoidal clamping block, and the other end of the clamping screw passes through the L-shaped clamping block and is fixedly connected to the inner ring of the first gear. The second gear is rotatably connected to the clamping block and meshes with the first gear. The third gear is rotatably connected to the L-shaped clamping block in a vertical direction and meshes with the second gear.

[0016] Furthermore, it also includes a limiting component, which comprises an abutment block, an abutment guide rod, a tensioning nut, a tensioning guide rod, a spring, and a tensioning screw. The abutment block abuts against the trapezoidal locking block. Two abutment guide rods are provided, each fixed to one side of the abutment block, and the abutment guide rods are slidably connected to the second transverse sliding groove. The tensioning nut is located on one side of the abutment block. Two tensioning guide rods are provided, each fixed to one side of the tensioning nut, and the tensioning guide rods are slidably connected to the first transverse sliding groove. One end of the spring is connected to the abutment block, and the other end of the spring is connected to the tensioning nut. The tensioning screw passes through the clamping seat and is threadedly connected to the tensioning nut.

[0017] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0018] One of the two clamping seats is fixedly connected to the fixed end of the tensioning component, and the other is fixedly connected to the tensioning end of the tensioning component. The aluminum rod is clamped using the clamping component. A locking device continuously clamps the clamping component during the clamping process to ensure the stability of the clamping during the stretching process. This solves the problems of existing flat-jaw clamps that easily cause deformation of the aluminum material and uneven clamping force, leading to inaccurate test data. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of an aluminum rod tensile testing device provided in an embodiment of this utility model;

[0020] Figure 2 A side view of an aluminum rod tensile testing device provided in an embodiment of this utility model;

[0021] Figure 3 for Figure 2 Schematic diagram of the cross section at point AA;

[0022] Figure 4 for Figure 3Enlarged view of point W in the middle;

[0023] Figure 5 A top view schematic diagram of an aluminum rod tensile testing device provided in an embodiment of this utility model;

[0024] Figure 6 for Figure 5 Schematic diagram of the cross section at point BB;

[0025] Figure 7 for Figure 6 Schematic diagram of the cross section at point Q;

[0026] Figure 8 One of the enlarged schematic diagrams of the clamp component in an aluminum rod tensile testing device provided in this embodiment of the present utility model;

[0027] Figure 9 This utility model provides a second enlarged schematic diagram of the clamp component in an aluminum rod tensile testing device.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Tensioning component; 11. Support base; 12. Support frame; 121. Through groove; 13. Support slider; 14. Drive component; 141. Rotating screw; 142. Support nut; 143. Drive bracket; 144. Drive motor; 15. Support connecting rod;

[0030] 2. Fixture component; 21. Clamping seat; 211. First transverse slide groove; 212. Second transverse slide groove; 213. First inclined slide groove; 214. Second inclined slide groove;

[0031] 22. Clamping component; 221. Clamping block; 222. Clamping guide rod;

[0032] 23. Clamping component; 231. Trapezoidal clamping block; 232. Clamping guide rod; 233. Clamping support block; 234. First gear; 235. Clamping screw; 236. Second gear; 237. Third gear; 238. Rocker arm;

[0033] 24. Limiting component; 241. Abutting block; 242. Abutting guide rod; 243. Tightening nut; 244. Tightening guide rod; 245. Spring; 246. Tightening screw;

[0034] 3. Pressure sensor. Detailed Implementation

[0035] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0037] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0038] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0039] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0040] like Figures 1 to 9As shown, an aluminum rod tensile testing device includes a tensile component 1 and a clamping component 2. The tensile component 1 has a fixed end and a tensioning end. There are two clamping components 2, one of which is fixed to the fixed end of the tensile component 1, and the other is fixed to the tensioning end of the tensile component 1. Both include a clamping seat 21, a clamping element 22, and a locking element 23. A set of clamping elements 22 is symmetrically connected to both sides of the clamping seat 21 for clamping both sides of the aluminum rod. A set of locking elements 23 is symmetrically connected to both sides of the clamping seat 21 and abuts against the clamping elements 22 for continuously locking the clamping elements 22 during the clamping process.

[0041] In this embodiment, one of the two clamping seats 21 is fixedly connected to the fixed end of the tension member 1, and the other is fixedly connected to the tensioning end of the tension member 1. The aluminum rod is clamped using the clamping member 22. The locking member 23 continuously locks the clamping member 22 during the clamping process to ensure the stability of the clamping during the stretching process. This solves the problems of existing flat-jaw clamps that easily cause deformation of the aluminum material and uneven clamping force, resulting in inaccurate test data.

[0042] In some embodiments, the tension member 1 includes a support base 11, a support frame 12, a support slider 13, and a driving component 14. The support frame 12 is inverted U-shaped and is fixed to the support base 11. The inner cavity of the inverted U-shaped support frame 12 is hollow, and a plurality of through slots 121 are provided on the inverted U-shaped support frame 12, which communicate with the inner cavity of the support frame 12. A set of support sliders 13 is provided, and the support sliders 13 are slidably connected to the support frame 12. The driving component 14 is located in the inner cavity of the support frame 12 and is used to drive the support sliders 13.

[0043] In this embodiment, the support slider 13 is sleeved on the support frame 12, and the support slider 13 is slidably connected to the support frame 12. Therefore, when the driving component 14 drives the support slider 13 to slide on the support frame 12, the support slider 13 can be more stably slidably connected to the support frame 12.

[0044] In some embodiments, the driving component 14 includes a rotating screw 141, a supporting nut 142, a driving bracket 143, and a driving motor 144. The rotating screw 141 is rotatably connected to the inner cavity of the U-shaped support frame 12. The inner ring of the supporting nut 142 is threadedly connected to the rotating screw 141. The driving bracket 143 passes through the through groove 121, with one end of the driving bracket 143 fixedly connected to the supporting nut 142 and the other end of the driving bracket 143 fixedly connected to the supporting slider 13. The driving motor 144 has a fixed end and a rotating end. The fixed end of the driving motor 144 is fixed inside the supporting base 11, and the rotating end of the driving motor 144 is fixedly connected to the rotating screw 141.

[0045] In this embodiment, the drive motor 144 drives the rotating screw 141 to rotate. The rotating screw 141 rotates the inner cavity of the support frame 12. To improve the service life of the rotating screw 141, a rotating bearing is provided at the connection between the rotating screw 141 and the support frame 12, which should also fall within the protection scope of this application. Furthermore, the drive motor 144 is a servo motor.

[0046] In some embodiments, the device further includes two support connecting rods 15. The two support connecting rods 15 are symmetrically arranged on both sides of the clamping seat 21 at the tensioning end of the tension member 1. One end of each support connecting rod 15 is fixedly connected to the support slider 13, and the other end is connected to the clamping seat 21 at the tensioning end of the tension member 1.

[0047] In this embodiment, as Figure 1 As shown, the tensioning end of the tensioning member 1 is located in the middle of the support frame 12. Two support sliders 13 located in the middle of the support frame 12 are connected to the clamping seat 21 through two support connecting rods 15.

[0048] In some embodiments, the clamping seat 21 is hollow inside, and the clamping seat 21 is provided with a first transverse slide groove 211, a second transverse slide groove 212, a first oblique slide groove 213 and a second oblique slide groove 214.

[0049] In some embodiments, the clamping member 22 includes a clamping block 221 and a clamping guide rod 222. One side of the clamping block 221 is arc-shaped, and the arc surface of the clamping block 221 is used to clamp the aluminum rod. There are two clamping guide rods 222, which are respectively fixed to both sides of the clamping block 221, and the clamping guide rods 222 are slidably connected to the second inclined slide groove 214.

[0050] In this embodiment, the clamping guide rod 222 of the clamping block 221 is slidably connected to the second inclined slide groove 214. The second inclined slide groove 214 is set at an inclined angle along the vertical direction, thereby clamping the aluminum rod during the movement of the clamping block 221. Moreover, of the four sides of the middle part of the clamping block 221, three sides are set as planes and the other side is arc-shaped. Since the aluminum rod is cylindrical, by setting one side of the clamping block 221 as arc-shaped, the contact area between the clamping block 221 and the aluminum rod is increased, thereby improving the clamping stability of the clamping block 221.

[0051] In some embodiments, the clamping member 23 includes a trapezoidal clamping block 231 and a clamping guide rod 232. The trapezoidal clamping block 231 abuts against the clamping block 221. Two clamping guide rods 232 are provided, and the two clamping guide rods 232 are respectively fixed on both sides of the trapezoidal clamping block 231. The clamping guide rods 232 are slidably connected to the first inclined slide groove 213.

[0052] In this embodiment, the clamping guide rod 232 of the trapezoidal locking block 231 is slidably connected to the first inclined slide groove 213. The first inclined slide groove 213 is set at an inclined angle along the vertical direction. Therefore, during the movement of the trapezoidal locking block 231, it will press against the clamping block 221, thereby making the clamping block 221 clamp the aluminum rod more securely. In addition, the length of the end of the trapezoidal locking block 231 closer to the aluminum rod is smaller, and the length of the end of the trapezoidal locking block 231 farther away from the aluminum rod is larger. Therefore, during the movement of the trapezoidal locking block 231 toward the aluminum rod, it will press against the clamping block 221.

[0053] In some embodiments, a pressure sensor 3 is further included, one end of which abuts against the clamping block 221 and the other end of which abuts against the trapezoidal block 231, for detecting the pressure between the clamping block 221 and the trapezoidal block 231.

[0054] In this embodiment, a pressure sensor 3 is installed between the clamping block 221 and the trapezoidal clamping block 231. During the stretching process of the aluminum rod, the pressure between the clamping block 221 and the trapezoidal clamping block 231 is detected. The pressure sensor 3 is a CYMH-1 model.

[0055] In some embodiments, the clamping member 23 further includes a clamping block 233, a first gear 234, a clamping screw 235, a second gear 236, a third gear 237, and a rocker arm 238. The clamping block 233 is fixed on the clamping seat 21 and is L-shaped. The first gear 234 is horizontally disposed on the L-shaped clamping block 233. One end of the clamping screw 235 is fixedly connected to the trapezoidal clamping block 231. The other end is inserted through the L-shaped clamping block 233 and is fixedly connected to the inner ring of the first gear 234; the second gear 236 is rotatably connected to the clamping block 233 and meshes with the first gear 234; the third gear 237 is rotatably connected to the L-shaped clamping block 233 in a vertical direction and meshes with the second gear 236; the rocker arm 238 is fixedly connected to the inner ring of the third gear 237.

[0056] In this embodiment, during the tensile test, the pressure sensor 3 detects the pressure between the clamping block 221 and the trapezoidal locking block 231. When the pressure sensor 3 detects a decrease in pressure between the clamping block 221 and the trapezoidal locking block 231, it sends relevant information. The operator rotates the rocker arm 238, thereby driving the third gear 237, the second gear 236, and the first gear 234 to rotate. This causes the clamping screw 235 to drive the trapezoidal locking block 231 to slide along the first inclined slide groove 213. This achieves the clamping and releasing action of the trapezoidal locking block 231 on the clamping block 221.

[0057] In some embodiments, a limiting member 24 is further included, comprising an abutment block 241, an abutment guide rod 242, a tensioning nut 243, a tensioning guide rod 244, a spring 245, and a tensioning screw 246. The abutment block 241 abuts against the trapezoidal locking block 231. Two abutment guide rods 242 are provided, and the two abutment guide rods 242 are respectively fixed to both sides of the abutment block 241, and the abutment guide rods 242 are slidably connected to the second transverse sliding groove 212. The tensioning nut 243 is provided at the... The abutment block 241 is located on one side; two tensioning guide rods 244 are provided, and the two tensioning guide rods 244 are respectively fixed on both sides of the tensioning nut 243, and the tensioning guide rods 244 are slidably connected to the first transverse sliding groove 211; one end of the spring 245 is connected to the abutment block 241, and the other end of the spring 245 is connected to the tensioning nut 243; the tensioning screw 246 passes through the clamping seat 21, and the tensioning screw 246 is threadedly connected to the tensioning nut 243.

[0058] In this embodiment, the trapezoidal locking block 231 has locking teeth at the contact point with the abutment block 241. One side of the locking teeth is angled, so that the trapezoidal locking block 231 can move towards the aluminum rod without being obstructed. On the other side of the locking teeth, they are horizontal, so that the trapezoidal locking block 231 will be obstructed when moving away from the aluminum rod. This is to prevent the trapezoidal locking block 231 from sliding relative to the abutment block 241.

[0059] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0060] One of the two clamping seats is fixedly connected to the fixed end of the tensioning component, and the other is fixedly connected to the tensioning end of the tensioning component. The aluminum rod is clamped using the clamping component. A locking device continuously clamps the clamping component during the clamping process to ensure the stability of the clamping during the stretching process. This solves the problems of existing flat-jaw clamps that easily cause deformation of the aluminum material and uneven clamping force, leading to inaccurate test data.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tensile testing device for aluminum bars, characterized in that, include: Tension member (1), which has a fixed end and a tensioning end: The clamping component (2) is provided in two parts, one of which is fixed to the fixed end of the tensioning component (1), and the other is fixed to the tensioning end of the tensioning component (1). Both components include: The clamping seat (21) is hollow inside, and the clamping seat (21) is provided with a first transverse slide groove (211), a second transverse slide groove (212), a first oblique slide groove (213) and a second oblique slide groove (214). A clamping member (22) is provided, which is symmetrically connected to both sides of the clamping seat (21) for clamping both sides of the aluminum rod. The clamping member (22) includes: The clamping block (221) has one side in the shape of an arc, and the arc surface of the clamping block (221) is used to clamp the aluminum rod; Two clamping guide rods (222) are provided. The two clamping guide rods (222) are respectively fixed on both sides of the clamping block (221), and the clamping guide rods (222) are slidably connected to the second inclined slide groove (214). A clamping element (23) is provided, which is symmetrically connected to both sides of the clamping seat (21) and abuts against the clamping element (22) for continuously clamping the clamping element (22) during the clamping process; the clamping element (23) includes: A trapezoidal locking block (231) abuts against the clamping block (221); Two clamping guide rods (232) are provided, and the two clamping guide rods (232) are respectively fixed on both sides of the trapezoidal clamping block (231), and the clamping guide rods (232) are slidably connected to the first inclined sliding groove (213); the clamping member (23) further includes: A clamping block (233) is fixed on the clamping seat (21), and the clamping block (233) is arranged in an L-shape; The first gear (234) is horizontally mounted on the L-shaped clamping block (233); A clamping screw (235) is fixedly connected at one end to the trapezoidal clamping block (231), and the other end of the clamping screw (235) is inserted through the L-shaped clamping support block (233) and fixedly connected to the inner ring of the first gear (234). The second gear (236) is rotatably connected to the clamping block (233), and the second gear (236) meshes with the first gear (234); The third gear (237) is rotatably connected to the L-shaped clamping block (233) in a vertical direction, and the third gear (237) meshes with the second gear (236); The rocker arm (238) is fixedly connected to the inner ring of the third gear (237).

2. The aluminum rod tensile testing device according to claim 1, characterized in that, The tension member (1) includes: Support base (11); The support frame (12) is in the shape of an inverted U. The support frame (12) is fixed on the support base (11). The inner cavity of the inverted U-shaped support frame (12) is hollow, and the inverted U-shaped support frame (12) is provided with several through slots (121). The through slots (121) are connected to the inner cavity of the support frame (12). A set of support sliders (13) are provided, and the support sliders (13) are slidably connected to the support frame (12); A driving component (14) is located inside the support frame (12) and is used to drive the support slider (13).

3. The aluminum rod tensile testing device according to claim 2, characterized in that, The driving component (14) includes: Rotate the screw (141), which is rotatably connected to the inner cavity of the U-shaped support frame (12); A support nut (142) has its inner ring threadedly connected to the rotating screw (141); A drive bracket (143) is inserted through the through groove (121). One end of the drive bracket (143) is fixedly connected to the support nut (142), and the other end of the drive bracket (143) can be fixedly connected to the support slider (13). The drive motor (144) has a fixed end and a rotating end. The fixed end of the drive motor (144) is fixed inside the support base (11), and the rotating end of the drive motor (144) is fixedly connected to the rotating screw (141).

4. The aluminum rod tensile testing device according to claim 2, characterized in that, Also includes: There are two support connecting rods (15). The two support connecting rods (15) are symmetrically arranged on both sides of the clamping seat (21) at the tension end of the tension member (1). One end of the two support connecting rods (15) is fixedly connected to the support slider (13), and the other end is connected to the clamping seat (21) at the tension end of the tension member (1).

5. The aluminum rod tensile testing device according to claim 1, characterized in that, Also includes: A pressure sensor (3) has one end abutting against the clamping block (221) and the other end abutting against the trapezoidal block (231) to detect the pressure between the clamping block (221) and the trapezoidal block (231).

6. The aluminum rod tensile testing device according to claim 1, characterized in that, It also includes a limiting element (24), which includes: The abutting block (241) abuts against the trapezoidal locking block (231); Two abutting guide rods (242) are provided. The two abutting guide rods (242) are respectively fixed on both sides of the abutting block (241), and the abutting guide rods (242) are slidably connected to the second transverse sliding groove (212). A tightening nut (243) is provided on one side of the abutment block (241); Two tensioning guide rods (244) are provided. The two tensioning guide rods (244) are respectively fixed on both sides of the tensioning nut (243), and the tensioning guide rods (244) are slidably connected to the first transverse slide groove (211). A spring (245), one end of which is connected to the abutment block (241), and the other end of which is connected to the tightening nut (243); A tensioning screw (246) is inserted through the clamping seat (21), and the tensioning screw (246) is threadedly connected to the tensioning nut (243).

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