Metal material stress detection machine

Abstract

This invention provides a stress testing machine for metal materials, including a U-shaped frame with slidable baffles at both ends. A detection head is located above the horizontal section of the U-shaped frame. Two vertical plates are symmetrically arranged at the upper end of the horizontal section of the U-shaped frame. A first motor is located at the right end of the right vertical plate, with its movable end passing through the vertical plate and connected to one end of a screw. The other end of the screw extends into the vertical plate, and the outer end of the screw is threaded to a first rectangular plate. The lower surface of the first rectangular plate is concave upward to form a groove, and a magnet is placed in the groove. A second rectangular plate is located below the horizontal section of the U-shaped frame, with its upper surface concave downward to form a square groove, and a magnetic block is placed in the square groove. Sponges are placed at the inner ends of the first and second rectangular plates, and two scrapers are placed at the inner ends of the first and second rectangular plates. Compared with the prior art, this invention has the following advantages: the magnets and magnetic blocks drive the two sponges to clean the upper and lower ends of the transparent plate, improving the testing quality.

Description

Technical Field

[0001] This invention is a stress testing machine for metallic materials, belonging to the field of metallic materials technology. Background Technology

[0002] Metallic materials refer to materials with properties such as luster, ductility, electrical conductivity, and thermal conductivity. They are generally divided into ferrous metals and non-ferrous metals. After the processing of metallic materials, residual stress remains within them, which can easily cause deformation. To ensure the performance and service life of metallic materials, a metal material stress testing machine is generally used to detect the residual stress. Traditionally, the metallic material is first placed into the production equipment. After production, the product enters the testing equipment. Because the product itself has a high temperature after production, the temperature inside the testing equipment easily rises, resulting in a large temperature difference between the inside and outside of the testing equipment. This easily generates water vapor, which adheres to the testing port made of a transparent plate. When the testing head passes through the testing port, it can cause blurring during the testing process, thus affecting the testing quality. Therefore, a metallic material stress testing machine needs to be designed to solve the above problems. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a stress testing machine for metal materials to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a metal material stress testing machine, comprising a U-shaped frame, a conveying component provided at the lower end of the U-shaped frame, baffles slidably provided at both the left and right ends of the U-shaped frame, and adjusting components provided at both the front and rear ends of the baffles, the upper surface of the transverse part of the U-shaped frame being recessed downward to form a rectangular groove penetrating the upper and lower surfaces of the transverse part of the U-shaped frame, a transparent plate being provided in the rectangular groove, a detection part of a detection head being provided above the transverse part of the U-shaped frame, and a fixing part of the detection head being connected to the rear vertical part of the U-shaped frame;

[0005] Two vertical plates are symmetrically arranged at the upper end of the horizontal section of the U-shaped frame. A first motor is located at the right end of the right vertical plate. The movable end of the first motor passes through the vertical plate and is connected to one end of a screw. The other end of the screw extends into the vertical plate located on the left. The screw is rotatably connected to the vertical plate. The screw is located between the horizontal section of the U-shaped frame and the detection head. The outer end of the screw is threaded to a first rectangular plate. The first rectangular plate is located above the horizontal section of the U-shaped frame. The lower surface of the first rectangular plate is concave upward to form a groove. A magnet is placed in the groove. A second rectangular plate is located below the horizontal section of the U-shaped frame. The upper surface of the second rectangular plate is concave downward to form a square groove. A magnetic block is placed in the square groove. The magnetic block and the magnet are arranged to attract each other. Sponges are detachably installed on the inner ends of the first and second rectangular plates. The sponges are located to the left of the magnetic blocks and magnets. Two scrapers are symmetrically arranged on the inner ends of the first and second rectangular plates. The scraper located on the right is located to the right of the magnetic blocks and magnets. The scraper is located on the outer side of the sponge.

[0006] Furthermore, the conveying assembly includes a U-shaped frame disposed at the lower end of the U-shaped frame, a conveyor belt disposed inside the U-shaped frame, and multiple idlers rotatably disposed at equal intervals inside the U-shaped frame, the idlers engaging with the conveyor belt, and a second motor disposed on the rear side of the left end of the U-shaped frame, the movable end of the second motor passing through the U-shaped frame and connected to the idler located on the rear side.

[0007] Furthermore, the adjustment assembly includes horizontal plates disposed at the front and rear ends of the baffle, a support plate disposed below the horizontal plates, the support plate being disposed at the front and rear ends of the U-shaped frame, an electric push rod disposed at the upper end of the support plate, the movable end of the electric push rod being connected to the horizontal plates, and the electric push rod being disposed on the outer side of the U-shaped frame.

[0008] Furthermore, a protective component is provided at the lower end of the baffle, and the lower surface of the protective component is recessed upward to form multiple through holes, all of which penetrate the upper and lower surfaces of the protective component.

[0009] Furthermore, the vertical part of the U-shaped frame is recessed inward at the outer end to form a sliding groove, and two sliders are symmetrically arranged at the inner end of the baffle, with the sliders slidably disposed within the sliding groove.

[0010] Furthermore, the inner end of the slider is provided with a bull's eyeball fixing part, and the rolling part of the bull's eyeball is in contact with the inner wall of the groove.

[0011] Furthermore, a guide rod is provided at the left end of the vertical plate located on the right side, and the other end of the guide rod passes through the first rectangular plate and is connected to the vertical plate located on the left side. The first rectangular plate is slidably connected to the guide rod, and the guide rod is located above the transverse part of the U-shaped frame and in front of the screw.

[0012] Furthermore, the sponge has a hook and loop fastener surface facing outwards, and the first rectangular plate and the second rectangular plate have hook and loop fastener surfaces facing inwards, with the hook and loop fastener surfaces being bonded together.

[0013] Furthermore, a third motor is provided at the rear end of the vertical section of the U-shaped frame. The movable end of the third motor passes through the vertical section of the U-shaped frame and is connected to one end of the first circular rod. The other end of the first circular rod extends to the vertical section of the front of the U-shaped frame. A second gear is provided at the outer end of the first circular rod. A chain is meshed at the outer end of the second gear. A first gear is meshed on the left side inside the chain. The first gear is located to the left of the second gear. One end of the second circular rod is provided at the inner end of the second gear. The other end of the second circular rod extends to the vertical section of the front of the U-shaped frame. Lighting lamps are provided at the outer ends of both the first and second circular rods. The lighting lamps are located on the lower side of the second rectangular plate.

[0014] The beneficial effects of this invention are:

[0015] 1. Due to the high temperature of the product and the fact that the opening of the U-shaped frame is blocked by the baffle, water mist will be generated inside the U-shaped frame. This water mist will then adhere to the transparent plate. At this time, the first motor is started, causing the screw to rotate, which in turn causes the first rectangular plate, the magnet, and the second rectangular plate to move. This will bring the sponge into contact with the transparent plate, allowing the sponge to absorb the water mist adhering to the transparent plate. Then, the magnet and magnetic block will drive the two sponges to clean the top and bottom ends of the transparent plate, improving the inspection quality. At the same time, the magnet and magnetic block will prevent damage to the transparent plate, effectively reducing the possibility of leakage and ensuring the heat insulation effect.

[0016] 2. When the sponge has been used for a long time and needs to be replaced, first pull the sponge to separate the hook and loop side from the hook and loop side, and then replace the sponge, making it easy to replace the sponge. Attached Figure Description

[0017] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a stress testing machine for metallic materials according to the present invention;

[0019] Figure 2 This is a cross-sectional view of a metal material stress testing machine according to the present invention;

[0020] Figure 3 This is a schematic diagram of the slider and the bullseye in a metal material stress testing machine according to the present invention;

[0021] Figure 4This is a schematic diagram of the third motor in a metal material stress testing machine according to the present invention;

[0022] Figure 5 for Figure 2 Enlarged view of part A;

[0023] Figure 6 for Figure 3 Enlarged view of part B;

[0024] In the diagram: 1-U-shaped frame, 2-baffle, 3-vertical plate, 4-screw, 5-detection head, 7-transparent plate, 8-first rectangular plate, 9-first motor, 11-magnet, 12-scraper, 13-magnetic block, 14-second rectangular plate, 15-sponge, 21-horizontal plate, 22-electric push rod, 23-support plate, 24-rubber pad, 25-slider, 26-bullseye, 81-guide rod, 101-conveyor belt, 102-U-shaped frame, 103-first circular rod, 104-second circular rod, 105-lighting lamp, 106-idler, 107-second motor, 1001-third motor, 1002-chain, 1003-first gear, 1004-second gear, 1501-Velcro. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] Please see Figure 1 , Figure 2 , Figures 3 to 4 This invention provides a technical solution: a metal material stress testing machine, including a U-shaped frame 1, which provides installation space for a vertical plate 3. A conveying assembly is provided at the lower end of the U-shaped frame 1. The conveying assembly includes a U-shaped frame 102 located at the lower end of the U-shaped frame 1, which provides installation space for idler rollers 106. A conveyor belt 101 is provided inside the U-shaped frame 102, which conveys the product. Multiple idler rollers 106 are equidistantly rotatably arranged inside the U-shaped frame 102, which rotate the conveyor belt 101. The idler rollers 106 mesh with the conveyor belt 101. A second motor 107 is provided on the rear left side of the U-shaped frame 102, which rotates the idler rollers 106. The movable end of the second motor 107 passes through the U-shaped frame 102 and is connected to the idler rollers 106 located on the rear side.

[0027] In use, the finished products are first placed on the conveyor belt 101, and then the second motor 107 is started, which causes the movable end of the second motor 107 to rotate, thereby causing the idler roller 106 connected to the movable end of the second motor 107 to rotate. Since the idler roller 106 is meshed with the conveyor belt 101, the rotation of the idler roller 106 will drive the conveyor belt 101 to rotate, thereby causing the products set on the conveyor belt 101 to move, thus realizing the conveying of the products.

[0028] Please see Figure 1 , Figure 2 , Figure 3 , Figures 4 to 6 Both ends of the U-shaped frame 1 are equipped with sliding baffles 2 to provide heat insulation. Both ends of the baffles 2 are equipped with adjustment components, including horizontal plates 21 at the front and rear ends of the baffles 2. The baffles 2 can be moved by the horizontal plates 21. A support plate 23 is set below the horizontal plates 21 to provide installation space for the electric push rod 22. The support plate 23 is set at the front and rear ends of the U-shaped frame 102. The electric push rod 22 is set at the upper end of the support plate 23 to move the horizontal plates 21. The movable end of the electric push rod 22 is connected to the horizontal plates 21. The electric push rod 22 is set on the outer side of the U-shaped frame 102. A protective part is set at the lower end of the baffles 2. The protective part can be a rubber pad 24 to protect the baffles 2. The lower surface of the protective part is concave upward to form multiple through holes, which save materials during production. The multiple through holes penetrate the upper and lower surfaces of the protective part.

[0029] The vertical part of the U-shaped frame 1 is recessed inward at the outer end to form a groove, which provides installation space for the slider 25. Two sliders 25 are symmetrically arranged at the inner end of the baffle 2. The sliders 25 guide the movement of the baffle 2. The sliders 25 are slidably arranged in the groove. The inner end of the slider 25 is provided with a bullseye ball 26 fixing part, which facilitates the movement of the slider 25. The rolling part of the bullseye ball 26 fits against the inner wall of the groove.

[0030] When the product moves into the U-shaped frame 1, the electric push rod 22 is activated first, causing the horizontal plate 21 connected to the movable end of the electric push rod 22 to move. This causes the baffle 2 connected to the horizontal plate 21 to move, which in turn causes the slider 25 located at the inner end of the baffle 2 to move in the groove. This causes the rolling part of the bullseye ball 26 located at the inner end of the slider 25 to move along the inner wall of the groove, thereby causing the lower end of the baffle 2 to fit against the upper end of the U-shaped frame 102, thus sealing the opening of the U-shaped frame 1, preventing the ambient temperature from damaging the detection head 5, ensuring the accuracy and reliability of data acquisition, and providing heat insulation. This solves the problem of damage to the detection head 5 caused by high temperature.

[0031] Please see Figure 1 , Figure 2 , Figure 3 , Figures 4 to 5 The upper surface of the transverse part of the U-shaped frame 1 is recessed downward to form a rectangular groove that runs through the upper and lower surfaces of the transverse part of the U-shaped frame 1. The rectangular groove provides installation space for the transparent plate 7. The transparent plate 7 is installed in the rectangular groove to protect the detection head 5. Two vertical plates 3 are symmetrically arranged at the upper end of the transverse part of the U-shaped frame 1. The vertical plates 3 provide installation space for the first motor 9. The first motor 9 is installed at the right end of the vertical plate 3 on the right side. The first motor 9 is used to rotate the screw 4. The movable end of the first motor 9 passes through the vertical plate 3 and is connected to one end of the screw 4. The screw 4 moves the first rectangular plate 8. The other end of the screw 4 extends into the vertical plate 3 on the left side. The screw 4 is rotatably connected to the vertical plate 3. The screw 4 is located between the transverse part of the U-shaped frame 1 and the detection head 5. The outer end of the screw 4 is threaded to the first rectangular plate 8. The first rectangular plate 8 provides installation space for the magnet 11. The first rectangular plate 8 is located above the transverse part of the U-shaped frame 1.

[0032] The lower surface of the first rectangular plate 8 is recessed upward to form a groove, which provides installation space for the magnet 11. The magnet 11 is placed in the groove and the first rectangular plate 8 is moved by the magnet 11. The second rectangular plate 14 is set below the horizontal part of the U-shaped frame 1, which provides installation space for the magnetic block 13. The upper surface of the second rectangular plate 14 is recessed downward to form a square groove, which provides installation space for the magnetic block 13. The magnetic block 13 is placed in the square groove and the second rectangular plate 14 is moved by the magnetic block 13. The magnetic block 13 and the magnet 11 are arranged to attract each other. The sponge 15 is detachably set at the inner end of the first rectangular plate 8 and the second rectangular plate 14 to absorb water mist. The sponge 15 is set to the left of the magnetic block 13 and the magnet 11. Two scrapers 12 are symmetrically set at the inner end of the first rectangular plate 8 and the second rectangular plate 14 to clean the residual water stains. The scraper 12 on the right side is set to the right of the magnetic block 13 and the magnet 11. The scraper 12 is set on the outer side of the sponge 15.

[0033] One end of a guide rod 81 is provided on the left end of the vertical plate 3 on the right side. The guide rod 81 guides the movement of the first rectangular plate 8. The other end of the guide rod 81 passes through the first rectangular plate 8 and is connected to the vertical plate 3 on the left side. The first rectangular plate 8 is slidably connected to the guide rod 81. The guide rod 81 is located above the horizontal part of the U-shaped frame 1 and is located in front of the screw 4.

[0034] The sponge 15 has a rough surface of hook and loop fastener 1501 on its outer end, which allows for easy disassembly and removal of the sponge 15. The first rectangular plate 8 and the second rectangular plate 14 have hook surfaces of hook and loop fastener 1501 on their inner ends, and the rough surface of hook and loop fastener 1501 is bonded to the hook surface of hook and loop fastener 1501.

[0035] Because the product is at a high temperature, and because the opening of the U-shaped frame 1 is blocked by the baffle 2, water mist will be generated inside the U-shaped frame 1, which will then adhere to the transparent plate 7.

[0036] When water mist adheres to the transparent plate 7, the first motor 9 is activated, causing the screw 4 connected to the movable end of the first motor 9 to rotate. This, in turn, causes the first rectangular plate 8, which is threadedly connected to the screw 4, to move. When the first rectangular plate 8 moves, the magnet 11 set inside the first rectangular plate 8 will also move. Since the second rectangular plate 14 is equipped with a magnetic block 13, and the magnet 11 and the magnetic block 13 are arranged to attract each other, the movement of the first rectangular plate 8 will drive the second rectangular plate 14 to move. At this time, the sponge 15 set at the inner end of the first rectangular plate 8 and the second rectangular plate 14 will come into contact with the transparent plate 7. The sponge 15 will then absorb the water mist adhering to the transparent plate 7. The magnet 11 and the magnetic block 13 will then drive the two sponges 15 to clean the top and bottom ends of the transparent plate 7, improving the detection quality. At the same time, the magnet 11 and the magnetic block 13 will prevent damage to the transparent plate 7, effectively reducing the possibility of leakage and ensuring the heat insulation effect.

[0037] When the sponge 15 has been used for a long time and needs to be replaced, first hold the sponge 15, and then pull the sponge 15 to separate the hook side of the hook and loop fastener 1501, thereby replacing the sponge 15 and making it easy to replace.

[0038] Please see Figure 1 , Figure 2 , Figures 3 to 4 The detection head 5 is installed above the horizontal part of the U-shaped frame 1. The detection head 5 is used to detect the product. The fixing part of the detection head 5 is connected to the vertical part on the rear side of the U-shaped frame 1.

[0039] A third motor 1001 is installed at the rear end of the vertical section of the U-shaped frame 1. The third motor 1001 rotates the first circular rod 103. The movable end of the third motor 1001 passes through the vertical section of the U-shaped frame 1 and is connected to one end of the first circular rod 103. The first circular rod 103 rotates the second gear 1004. The other end of the first circular rod 103 extends to the front vertical section of the U-shaped frame 1. The second gear 1004 is installed at the outer end of the first circular rod 103. The second gear 1004 rotates the chain 1002. The outer end of the second gear 1004 meshes with the chain 1002. The chain 1002 rotates the first gear 1002. The rotation of 003 is achieved by a first gear 1003 meshing inside the left side of the chain 1002. The first gear 1003 is used to rotate the second circular rod 104. The first gear 1003 is located to the left of the second gear 1004. One end of the second circular rod 104 is located inside the second gear 1004. The rotation of the lighting lamp 105 is achieved through the second circular rod 104. The other end of the second circular rod 104 extends to the front vertical part of the U-shaped frame 1. Lighting lamps 105 are provided at the outer ends of both the first circular rod 103 and the second circular rod 104. The lighting lamps 105 are used to prevent shadows. The lighting lamps 105 are located on the lower side of the second rectangular plate 14.

[0040] After the water mist adhering to the transparent plate 7 is cleaned, the third motor 1001 is started first, causing the movable end of the third motor 1001 to rotate, which in turn causes the first circular rod 103 connected to the movable end of the third motor 1001 to rotate. When the first circular rod 103 rotates, it will drive the second gear 1004 to rotate. Since the outer end of the second gear 1004 is meshed with the chain 1002, the rotation of the second gear 1004 will drive the chain 1002 to rotate. Since the first gear 1003 is meshed inside the chain 1002, the rotation of the chain 1002 will drive the first gear 1003 to rotate, which will cause the second circular rod 104 located at the inner end of the first gear 1003 to rotate. When the first circular rod 103 and the second circular rod 104 rotate, the lighting lamp 105 located at the outer end of the first circular rod 103 and the second circular rod 104 will rotate.

[0041] At this point, the surface contour data of the product is collected through the detection head 5. This data will serve as the basis for subsequent analysis. The collected data undergoes denoising, filtering, and image enhancement to analyze the creep characteristics of the metal laser additive material and establish a mathematical model of the creep effect. The entropy function and invariant moment method are then used to correct for the creep effect in the processed contour data. Minimizing the entropy function value estimates and eliminates the deformation caused by creep in the data. The invariant moment method is used to extract invariant features from the contour data to compensate for the deformation caused by creep and obtain accurate residual stress distribution information. Then, the surface contour of the laser additive structure is extracted from the data. Finally, morphological analysis and feature extraction are performed on the extracted contour data to obtain information related to residual stress. The oscillation of the illumination lamp 105 prevents shadows on the product, improving the detection effect. The oscillation of the illumination lamp 105 solves the problem of shadows on the product.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stress testing machine for metallic materials, characterized in that: The device includes a U-shaped frame (1), with a conveying assembly at the lower end of the U-shaped frame (1). Baffles (2) are slidably mounted on both the left and right ends of the U-shaped frame (1), and adjusting assemblies are mounted on both the front and rear ends of the baffles (2). A rectangular groove is formed by a downward indentation on the upper surface of the horizontal portion of the U-shaped frame (1), penetrating both the upper and lower surfaces of the horizontal portion. A transparent plate (7) is mounted inside the rectangular groove. A detection head (5) is mounted above the horizontal portion of the U-shaped frame (1), and the fixed portion of the detection head (5) is connected to the rear vertical portion of the U-shaped frame (1). A third motor (1001) is mounted at the rear end of the rear vertical portion of the U-shaped frame (1). The movable end of the third motor (1001) passes through the rear vertical portion of the U-shaped frame (1) and is connected to one end of a first circular rod (103). (103) The other end extends to the front vertical part of the U-shaped frame (1). The outer end of the first circular rod (103) is provided with a second gear (1004). The outer end of the second gear (1004) is meshed with a chain (1002). The left side of the chain (1002) is meshed with a first gear (1003). The first gear (1003) is located to the left of the second gear (1004). The inner end of the second gear (1004) is provided with one end of the second circular rod (104). The other end of the second circular rod (104) extends to the front vertical part of the U-shaped frame (1). The outer ends of the first circular rod (103) and the second circular rod (104) are both provided with lighting lamps (105). The lighting lamps (105) are located on the lower side of the second rectangular plate (14). Two vertical plates (3) are symmetrically arranged on the upper part of the horizontal section of the U-shaped frame (1). A first motor (9) is arranged on the right end of the vertical plate (3) on the right side. The movable end of the first motor (9) passes through the vertical plate (3) and is connected to one end of a screw (4). The other end of the screw (4) extends into the vertical plate (3) on the left side. The screw (4) is rotatably connected to the vertical plate (3). The screw (4) is arranged between the horizontal section of the U-shaped frame (1) and the detection head (5). The outer end of the screw (4) is threadedly connected to a first rectangular plate (8). The first rectangular plate (8) is arranged above the horizontal section of the U-shaped frame (1). The lower surface of the first rectangular plate (8) is concave upward to form a groove. A magnet (11) is arranged in the groove. A second rectangular plate (14) is provided below the horizontal part of the U-shaped frame (1). The upper surface of the second rectangular plate (14) is recessed downward to form a square groove. A magnetic block (13) is provided in the square groove. The magnetic block (13) and the magnet (11) are arranged to attract each other. A sponge (15) is detachably provided at the inner end of the first rectangular plate (8) and the second rectangular plate (14). The sponge (15) is provided on the left side of the magnetic block (13) and the magnet (11). Two scrapers (12) are symmetrically provided at the inner end of the first rectangular plate (8) and the second rectangular plate (14). The scraper (12) located on the right side is provided on the right side of the magnetic block (13) and the magnet (11). The scraper (12) is provided on the outer side of the sponge (15).

2. The metal material stress detection machine according to claim 1, characterized in that: The conveying assembly includes a U-shaped frame (102) located at the lower end of the U-shaped frame (1), a conveyor belt (101) is provided inside the U-shaped frame (102), and multiple idlers (106) are equidistantly rotatably arranged inside the U-shaped frame (102). The idlers (106) are engaged in the conveyor belt (101). A second motor (107) is provided on the rear side of the left end of the U-shaped frame (102). The movable end of the second motor (107) passes through the U-shaped frame (102) and is connected to the idler (106) located on the rear side.

3. A stress testing machine for metallic materials according to claim 2, characterized in that: The adjustment assembly includes a horizontal plate (21) disposed at both ends of the baffle (2), a support plate (23) disposed below the horizontal plate (21), the support plate (23) disposed at both ends of the U-shaped frame (102), an electric push rod (22) disposed at the upper end of the support plate (23), the movable end of the electric push rod (22) being connected to the horizontal plate (21), and the electric push rod (22) being disposed on the outer side of the U-shaped frame (102).

4. A stress testing machine for metallic materials according to claim 1, characterized in that: The lower end of the baffle (2) is provided with a protective component. The lower surface of the protective component is recessed upward to form multiple through holes, and the multiple through holes penetrate the upper and lower surfaces of the protective component.

5. A stress testing machine for metallic materials according to claim 1, characterized in that: The vertical part of the U-shaped frame (1) is recessed inward at the outer end to form a sliding groove, and two sliders (25) are symmetrically arranged at the inner end of the baffle (2), and the sliders (25) are slidably arranged in the sliding groove.

6. A stress testing machine for metallic materials according to claim 5, characterized in that: The slider (25) is provided with a fixed part for the bull's eyeball (26) at its inner end, and the rolling part of the bull's eyeball (26) is in contact with the inner wall of the groove.

7. A stress testing machine for metallic materials according to claim 1, characterized in that: One end of the guide rod (81) is provided on the left end of the vertical plate (3) located on the right side. The other end of the guide rod (81) passes through the first rectangular plate (8) and is connected to the vertical plate (3) located on the left side. The first rectangular plate (8) is slidably connected to the guide rod (81). The guide rod (81) is located above the horizontal part of the U-shaped frame (1) and is located in front of the screw (4).

8. A stress testing machine for metallic materials according to claim 1, characterized in that: The sponge (15) has a rough surface of hook and loop fastener (1501) on its outer end, and the first rectangular plate (8) and the second rectangular plate (14) have hook surfaces of hook and loop fastener (1501) on their inner ends. The rough surface of the hook and loop fastener (1501) is bonded to the hook surface of the hook and loop fastener (1501).

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