Metal material plastic yield strength detection device

Abstract

The utility model belongs to the technical field of detection equipment, and relates to a metal material plasticity yield strength detection device. The detection device comprises a rectangular working table, and a supporting and pressing ring assembly capable of moving in the width direction of the rectangular working table is arranged on the table top of the rectangular working table; an inverted-U-shaped auxiliary frame is further fixed to the table top of the rectangular workbench, the auxiliary frame is parallel to the length direction of the rectangular workbench and located in the middle of the rectangular workbench, and a pressure detection assembly capable of conducting lifting movement is arranged on a cross beam of the auxiliary frame; a telescopic clamping assembly is fixedly arranged on the lower portion of a supporting rod of the auxiliary frame, and the telescopic clamping assembly makes contact with the side edge of the metal material to be detected so that the metal material to be detected can be clamped and fixed. According to the utility model, the metal material is supported by the lower backing ring, the area around the point to be measured is pressed by the upper pressing ring, and the influence of the stress state around the deformation point on the yield strength of the adjacent area can be avoided through the pressing effect of the upper pressing ring.

Description

A device for testing the plastic yield strength of metallic materials Technical Field

[0001] This utility model belongs to the technical field of testing equipment, and relates to the testing of plastic yield strength, and more particularly to a device for testing the plastic yield strength of metallic materials. Background Technology

[0002] Yield strength is the yield limit of a metallic material when it yields. To measure the plastic yield strength of metallic materials, existing patent literature (publication number: CN216816308U, announcement date: June 24, 2022) discloses a device for testing the plastic yield strength of metallic materials. When using this device for yield strength testing, the device is first moved to a suitable position using casters. Then, the metallic material is fixed inside the test chamber. The clamping groove, fixing block, pressure block, and adjusting screw work together to stably clamp the metallic material. Next, a microcomputer-controlled hydraulic cylinder lowers the hydraulic rod, causing the testing mechanism to move downwards. Finally, rotating the adjusting handle causes the connecting block to move left and right on the threaded rod under the action of the threaded sleeve. Through the power of the hydraulic cylinder and hydraulic rod, the yield strength at different points on the metallic material is tested.

[0003] However, when a point on the surface of a material is tested and deformed, the stress distribution inside the material changes. After local deformation, the overall mechanical properties of the material may no longer be uniform. When other points are measured subsequently, the stress state around the previously deformed point may affect the yield strength performance of adjacent areas. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for testing the plastic yield strength of metallic materials.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This device for testing the plastic yield strength of metallic materials includes: a rectangular worktable, on the surface of which is provided a support and clamping ring assembly that can move along the length of the rectangular worktable;

[0007] An inverted U-shaped auxiliary frame is fixed on the surface of the rectangular worktable. The auxiliary frame is parallel to the length of the rectangular worktable and located in the middle of the rectangular worktable. A pressure detection component capable of lifting and moving is installed on the crossbeam of the auxiliary frame. A telescopic clamping component is fixed at the lower part of the support rod of the auxiliary frame. The telescopic clamping component contacts the side of the metal material to be tested to achieve clamping and fixing of the metal material to be tested.

[0008] Specifically, the support ring clamping assembly includes an upper pressure ring and a lower pad ring arranged concentrically. At least four upper traction wires are fixed to the outer side of the upper pressure ring, and at least four lower traction wires are fixed to the outer side of the lower pad ring. The number of upper and lower traction wires is even. Each upper and lower traction wire extends to the side of the corresponding rectangular worktable. A winch is installed on each side of the rectangular worktable. The winch is provided with a first winding groove for winding the upper traction wire and a second winding groove for winding the lower traction wire.

[0009] By rotating two winches positioned opposite each other on the short side of the rectangular worktable, one winch is used to wind / unwind the corresponding traction line, and the other winch is used to simultaneously wind / unwind the corresponding traction line, thereby achieving synchronous movement of the upper pressure ring and the lower pad ring along the length of the rectangular worktable; when they reach the designated position, the two winches positioned opposite each other on the long side of the rectangular worktable are rotated to simultaneously tighten the upper and lower traction lines, thereby fixing the upper pressure ring and the lower pad ring.

[0010] Specifically, a rectangular frame is also provided above the rectangular workbench, and an electric telescopic rod is provided at each of the four corners of the rectangular workbench corresponding to the rectangular frame. The telescopic end of the electric telescopic rod is connected to the connecting lug at the corner of the rectangular frame to realize the raising and lowering of the entire rectangular frame.

[0011] Specifically, each side of the rectangular workbench is provided with a connecting part for mounting the bracket, and each connecting part is provided with a first threading hole for passing through the lower traction wire of the outer side of the lower pad ring.

[0012] The insert is in the shape of an inverted U and is located above the corresponding winch. A conduit for passing the upper traction wire through the outer edge of the upper pressure ring is fixedly installed on the insert. The sides of the rectangular frame are respectively provided with second conduit holes for passing the upper traction wire through the outer edge of the upper pressure ring. The bottom of the auxiliary frame is provided with a rectangular hole for passing the upper traction wire through the outer edge of the upper pressure ring in the vertical direction. Below the rectangular hole is a third conduit hole for passing the lower traction wire through the outer edge of the upper pressure ring.

[0013] Along the length direction, the upper traction wire on the outer side of the upper pressure ring is received into the first winding groove of the winch through the rectangular groove, the second wire hole and the wire tube, and the lower traction wire on the outer side of the lower pressure ring is received into the second winding groove of the winch through the third wire hole and the first wire hole.

[0014] Along the width direction, the upper traction wire on the outer side of the upper pressure ring is received into the first winding groove of the winch through the second wire hole and the wire tube, and the lower traction wire on the outer side of the lower pressure ring is received into the second winding groove of the winch through the first wire hole.

[0015] Specifically, the conduit is perpendicular to the crossbeam of the socket, and an electric push rod is provided below the conduit. The fixed end of the electric push rod is fixedly installed on the connecting part, and the free end is connected to the bottom of the crossbeam.

[0016] Specifically, the pressure detection assembly includes: a lead screw spanning between the support rods of the auxiliary frame, one end of the lead screw being equipped with a drive unit for driving its rotation, and the other end being rotatably fixed to the inner wall of the support rod; the lead screw is threadedly connected to a first hydraulic rod sleeved thereon, the telescopic end of the first hydraulic rod facing downward and equipped with a pressure sensor, and a pressing head being fixedly installed on the lower surface of the pressure sensor.

[0017] Specifically, a lifting frame is also provided across the support rods of the auxiliary frame. The lifting frame is located below the lead screw and can move up and down along the support rods. The pressure sensor is plugged into the lifting frame.

[0018] Specifically, the retractable clamping assembly includes: a second hydraulic rod fixed to the outer surface of the support rod of the auxiliary frame, the second hydraulic rod being perpendicular to the outer surface of the support rod; a clamping frame is installed on the telescopic end of the second hydraulic rod near the support clamping ring assembly, and by driving the second hydraulic rod, the clamping frame is moved closer to the metal material to be tested until the two come into contact, so as to achieve clamping and fixing of the metal material to be tested.

[0019] Specifically, a movable support is provided below the rectangular worktable, and the lower surface of the rectangular worktable is fixedly connected to the movable support.

[0020] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0021] 1) This testing device, by setting a lower pad ring and an upper pressure ring, uses the lower pad ring to support the metal material and the upper pressure ring to press down on the area around the test point of the metal material. When the pressing head is lowered to test the yield strength of the metal material surface, the pressing action of the upper pressure ring can avoid the influence of the stress state around the deformation point on the yield strength of the adjacent area.

[0022] 2) This testing device uses the extension and retraction of an electric telescopic rod to raise and lower a rectangular frame, and uses an upper traction line that runs through the rectangular frame to drive the upper pressure ring to rise and fall, thereby adjusting the distance between the upper pressure ring and the lower pad ring, which makes it easier to put in metal materials of different thicknesses. Attached Figure Description

[0023] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a first structural diagram of the metal material plastic yield strength testing device provided by this utility model;

[0026] Figure 2 is a magnified view of part A in Figure 1;

[0027] Figure 3 is a second structural diagram of the metal material plastic yield strength testing device provided by this utility model;

[0028] Figure 4 is a third structural diagram of the metal material plastic yield strength testing device provided by this utility model.

[0029] The components are as follows: 1. Rectangular worktable; 2. Auxiliary frame; 3. Rectangular hole; 4. Lead screw; 5. Lifting frame; 6. Pressure sensor; 7. Pressing head; 8. First hydraulic rod; 9. Clamping frame; 10. Rectangular frame; 11. Electric telescopic rod; 12. Upper pressure ring; 13. Lower pad ring; 14. Winch; 15. Upper traction line; 16. Lower traction line; 17. Connecting part; 18. First wire hole; 19. Second wire hole; 20. Third wire hole; 21. Wire conduit; 22. Electric push rod; 23. Insert bracket; 24. Connecting ear; 25. Second hydraulic rod. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples consistent with some aspects of this invention as detailed in the appended claims.

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] Example

[0033] Referring to Figures 1 to 4, this embodiment provides a device for testing the plastic yield strength of metallic materials, including: a rectangular worktable 1, on which a support and clamping ring assembly capable of moving along the length direction of the rectangular worktable 1 is provided;

[0034] An inverted U-shaped auxiliary frame 2 is fixed on the surface of the rectangular workbench 1. The auxiliary frame 2 is parallel to the length of the rectangular workbench 1 and located in the middle of the rectangular workbench 1. A pressure detection component capable of lifting and moving is provided on the crossbeam of the auxiliary frame 2. A telescopic clamping component is fixedly provided at the lower part of the support rod of the auxiliary frame 2. The telescopic clamping component contacts the side of the metal material to be tested to achieve clamping and fixing of the metal material to be tested.

[0035] In this embodiment, the support ring clamping assembly includes an upper pressure ring 12 and a lower pad ring 13 arranged concentrically. At least four upper traction wires 15 are fixed to the outer side of the upper pressure ring 12, and at least four lower traction wires 16 are fixed to the outer side of the lower pad ring 13. The number of upper traction wires 15 and lower traction wires 16 is even. Each upper traction wire 15 and lower traction wire 16 extends to the side of the corresponding rectangular workbench 1. Each side of the rectangular workbench 1 is equipped with a winch 14. The winch 14 is provided with a first winding groove for winding the upper traction wire 15 and a second winding groove for winding the lower traction wire 16.

[0036] By rotating two winches 14 arranged opposite each other on the short side of the rectangular worktable 1, one winch 14 is used to realize the winding / unwinding of the corresponding traction line, and the other winch 14 is used to realize the synchronous winding / unwinding of the corresponding traction line, thereby realizing the synchronous movement of the upper pressure ring 12 and the lower pad ring 13 along the length direction of the rectangular worktable 1; when it moves to the designated position, the two winches 14 arranged opposite each other on the long side of the rectangular worktable 1 are rotated to realize the synchronous tightening of the upper traction line 15 and the lower traction line 16, thereby realizing the fixation of the upper pressure ring 12 and the lower pad ring 13.

[0037] It should be noted that in this embodiment, the metal material to be tested is fixed on the table surface of the rectangular worktable 1, and the metal material is lifted to a certain height using the lower pad ring 13. The upper pressure ring 12 presses down on the periphery of the area of ​​the metal material to be tested supported by the lower pad ring 13. The upper pressure ring 12 is used to press and fix the surface of the metal material to be tested. When testing the area covered by the upper pressure ring 12, the pressing of the upper pressure ring 12 and the support of the lower pad ring 13 can prevent the test results from being affected by deformation of other parts of the surface of the metal material to be tested.

[0038] The upper pressure ring 12 and the lower pad ring 13 move along the width of the rectangular worktable 1. Four traction lines are fixedly installed on the outer side of the upper pressure ring 12 and the lower pad ring 13. The four traction lines extend to the sides of the rectangular worktable 1. By releasing or rewinding the four traction lines independently, the lower pad ring 13 and the upper pressure ring 12 can be pulled to move along the length of the rectangular worktable 1, thereby realizing the hardness test of different areas of the surface of the metal material to be tested.

[0039] Furthermore, a rectangular frame 10 is provided above the rectangular workbench 1. Electric telescopic rods 11 are respectively provided at the four corners of the rectangular workbench 10. The telescopic ends of the electric telescopic rods 11 are connected to the connecting ears 24 at the corners of the rectangular frame 10 to realize the lifting and lowering of the entire rectangular frame 10.

[0040] Here, to accommodate metal materials of different thicknesses, the height of the upper pressure ring 12 needs to be adjusted. Therefore, the lower traction line 16 on the lower pad ring 13 is set through the side of the rectangular worktable 1. A rectangular frame 10 is also installed above the rectangular worktable 1. The upper traction line 15 on the side of the upper pressure ring 12 passes through the side of the rectangular frame 10. An electric telescopic rod 11 is fixedly installed at the corner of the table surface of the rectangular worktable 1, which contacts the bottom surface of the rectangular frame 10. The extension and retraction of the electric telescopic rod 11 is used to realize the lifting and lowering of the rectangular frame 10, and the upper pressure ring 12 is lifted and lowered by the upper traction line 15 passing through the rectangular frame 10.

[0041] Furthermore, each side of the rectangular workbench 1 is provided with a connecting part 17 for mounting the insert 23, and each connecting part 17 is provided with a first threading hole 18 for passing through the lower traction wire 16.

[0042] The insert 23 is in the shape of an inverted U and is located above the corresponding winch 14. A conduit 21 for passing the upper traction line 15 is fixedly installed on the insert 23, so that the upper traction line 15 connected to the upper pressure ring 12 moves in a zigzag path. The sides of the rectangular frame 10 are respectively provided with second conduit holes 19 for passing the upper traction line 15. The bottom of the auxiliary frame 2 is provided with a rectangular hole 3 for passing the upper traction line 15 in the vertical direction. Below the rectangular hole 3 is a third conduit hole 20 for passing the lower traction line 16.

[0043] Along the length direction, the upper traction wire 15 is received into the first winding groove of the winch 14 through the rectangular hole 3, the second wire hole 19 and the wire tube 21, and the lower traction wire 16 is received into the second winding groove of the winch 14 through the third wire hole 20 and the first wire hole 18.

[0044] Along the width direction, the upper traction wire 15 is received into the first winding groove of the winch 14 through the second wire hole 19 and the wire tube 21, and the lower traction wire 16 is received into the second winding groove of the winch 14 through the first wire hole 18.

[0045] In this embodiment, to enable the movement of the upper pressure ring 12 and the lower pad ring 13: winches 14 are installed on all four sides of the rectangular worktable 1. Each winch 14 has two winding grooves. Following the order of proximity to the sides of the rectangular worktable 1, one winding groove is used to wind the lower traction wire 16 of the lower pad ring 13, and the other winding groove is used to wind the upper traction wire 15 of the upper pressure ring 12. Referring to Figures 1, 2, and 3, the length direction of the rectangular worktable 1 in Figure 1 is defined as the left-right direction. With the width direction being the front-to-back direction, the winch 14 on the left side of the rectangular workbench 1 rotates to wind up the corresponding traction line, while the winch 14 on the right side rotates to release the corresponding traction line, thereby enabling the lower pad ring 13 and the upper pressure ring 12 to move to the left, and vice versa; and after the lower pad ring 13 and the upper pressure ring 12 move to the designated position, the winches 14 on the front and rear sides are rotated to tighten the traction line, and the position of the lower pad ring 13 and the upper pressure ring 12 can be fixed by the four taut traction lines.

[0046] Furthermore, the conduit 21 is perpendicular to the crossbeam of the insert 23, and an electric push rod 22 is provided below the conduit 21. The fixed end of the electric push rod 22 is fixedly installed on the connecting part 17, and the free end is connected to the bottom of the crossbeam.

[0047] In this embodiment, when the rectangular frame 10 is raised and lowered, in order to prevent the upper traction line 15 connected to the upper pressure ring 12 from loosening or breaking, the extension and retraction of the electric push rod 22 is used to raise and lower the wire tube 21 with the assistance of the insert bracket 23, thereby adjusting the tightness of the upper traction line 15. That is, in actual use, referring to Figure 2, when the upper pressure ring 12 rises, the wire tube 21 rises, and when the upper pressure ring 12 falls, the wire tube 21 falls.

[0048] Furthermore, the pressure detection assembly includes: a lead screw 4 spanning between the support rods of the auxiliary frame 2, one end of the lead screw 4 being equipped with a drive unit for rotating it, and the other end being rotatably fixed to the inner wall of the support rod; the lead screw 4 is threadedly connected to a first hydraulic rod 8 sleeved thereon, the telescopic end of the first hydraulic rod 8 facing downwards and equipped with a pressure sensor 6, and a pressing head 7 being fixedly installed on the lower surface of the pressure sensor 6. Here, the drive unit can be a stepper motor installed at the end of the lead screw 4, located at the end outside the crossbeam of the auxiliary frame 2, driving the lead screw 4 to rotate via the stepper motor, causing the first hydraulic rod 8 at the top of the auxiliary frame 2 to move along the length of the rectangular worktable 1, so as to follow the position change of the lower pad ring 13.

[0049] Furthermore, a lifting frame 5 is also provided across the support rods of the auxiliary frame 2 to prevent the pressing head 7 from tilting; the lifting frame 5 is located below the lead screw 4 and can move up and down along the support rods, and the pressure sensor 6 is plugged into the lifting frame 5.

[0050] Furthermore, the retractable clamping assembly includes: a second hydraulic rod 25 fixed to the outer surface of the support rod of the auxiliary frame 2, the second hydraulic rod 25 being perpendicular to the outer surface of the support rod; a clamping frame 9 is installed on the telescopic end of the second hydraulic rod 25 near the support clamping ring assembly, and by driving the second hydraulic rod 25, the clamping frame 9 is driven to approach the metal material to be tested until the two come into contact, so as to achieve clamping and fixing of the metal material to be tested.

[0051] Furthermore, for ease of movement, a movable support is provided below the rectangular worktable 1, and the lower surface of the rectangular worktable 1 is fixedly connected to the movable support.

[0052] The working principle of the detection device provided in this embodiment is as follows:

[0053] Based on the thickness of the metal material to be tested, the extension and retraction of the electric telescopic rod 11, under the lifting action of the rectangular frame 10, causes the upper traction line 15 to drive the upper pressure ring 12 to rise and fall, placing the metal material to be tested between the upper pressure ring 12 and the lower pad ring 13, and clamping and fixing it with two clamping frames 9. When the metal material to be tested is tested at multiple points in sequence, the lower pad ring 13 and the upper pressure ring 12 move synchronously and in the same direction along the length of the rectangular worktable 1. Simultaneously, the first hydraulic rod 8 at the top of the auxiliary frame 2 drives the pressure sensor 6 and the pressing head 7 to move synchronously. After the upper pressure ring 12 moves to the designated point and is clamped by the lower pad ring 13 and the upper pressure ring 12, the pressing head 7 descends to realize the yield strength test of the test point covered by the upper pressure ring 12.

[0054] It should be noted that the selection and connection of the pressure sensor 6, the first hydraulic rod 8, the electric telescopic rod 11, the electric push rod 22, and the winch 14 in this embodiment are all common knowledge in the field. Their working principles are known technologies, and the appropriate models can be selected according to actual use. Therefore, the control methods and wiring arrangements of the pressure sensor 6, the first hydraulic rod 8, the electric telescopic rod 11, the electric push rod 22, and the winch 14 will not be described in detail here, as long as the corresponding functions can be achieved.

[0055] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0056] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A device for testing the plastic yield strength of metallic materials, characterized in that, include: A rectangular worktable (1) is provided on the table surface of the rectangular worktable (1), and a support clamping ring assembly that can move along the length direction of the rectangular worktable (1) is provided on the table surface of the rectangular worktable (1); an auxiliary frame (2) in the shape of an inverted U is also fixed on the table surface of the rectangular worktable (1), the auxiliary frame (2) is arranged parallel to the length direction of the rectangular worktable (1) and located in the middle of the rectangular worktable (1), and a pressure detection assembly that can be lifted and moved is provided on the crossbeam of the auxiliary frame (2); a telescopic clamping assembly is fixedly provided on the lower part of the support rod of the auxiliary frame (2), and the metal material to be tested is clamped and fixed by contacting the side of the metal material to be tested through the telescopic clamping assembly.

2. The device for testing the plastic yield strength of metallic materials according to claim 1, characterized in that, The support ring clamping assembly includes an upper pressure ring (12) and a lower pad ring (13) arranged concentrically. At least four upper traction wires (15) are fixed on the outer side of the upper pressure ring (12), and at least four lower traction wires (16) are fixed on the outer side of the lower pad ring (13). The number of upper traction wires (15) and lower traction wires (16) is even. Each upper traction wire (15) and lower traction wire (16) extends to the side of the corresponding rectangular workbench (1). Each side of the rectangular workbench (1) is equipped with a winch (14). The winch (14) is provided with a first winding groove for winding the upper traction wire (15) and a winding groove for winding the lower traction wire. (16) The second winding groove; by rotating the two winches (14) arranged opposite to each other on the short side of the rectangular worktable (1), one winch (14) is used to realize the winding / unwinding of the corresponding traction line, and the other winch (14) is used to realize the synchronous release / winding of the corresponding traction line, thereby realizing the synchronous movement of the upper pressure ring (12) and the lower pad ring (13) along the length direction of the rectangular worktable (1); when it moves to the designated position, by rotating the two winches (14) arranged opposite to each other on the long side of the rectangular worktable (1), the upper traction line (15) and the lower traction line (16) are synchronously tightened, thereby realizing the fixation of the upper pressure ring (12) and the lower pad ring (13).

3. The device for testing the plastic yield strength of metallic materials according to claim 2, characterized in that, A rectangular frame (10) is also provided above the rectangular workbench (1). Electric telescopic rods (11) are respectively provided at the four corners of the rectangular workbench (1) and the telescopic ends of the electric telescopic rods (11) are connected to the connecting ears (24) at the corners of the rectangular frame (10) to realize the lifting and lowering of the entire rectangular frame (10).

4. The device for testing the plastic yield strength of metallic materials according to claim 3, characterized in that, Each side of the rectangular workbench (1) is provided with a connecting part (17) for mounting a bracket (23), and each connecting part (17) is provided with a first threading hole (18) for threading the lower traction line (16); the bracket (23) is in the shape of an inverted U and is located above the corresponding winch (14), and a threading tube (21) for threading the upper traction line (15) is fixedly installed on the bracket (23); the sides of the rectangular frame (10) are respectively provided with second threading holes (19) for threading the upper traction line (15), and the bottom of the auxiliary frame (2) is provided with a rectangular hole (3) for threading the upper traction line (15) in the vertical direction. Below is a third threading hole (20) for threading the lower traction line (16); along the length direction, the upper traction line (15) is received into the first winding groove of the winch (14) through the rectangular hole (3), the second threading hole (19) and the threading tube (21), and the lower traction line (16) is received into the second winding groove of the winch (14) through the third threading hole (20) and the first threading hole (18); along the width direction, the upper traction line (15) is received into the first winding groove of the winch (14) through the second threading hole (19) and the threading tube (21), and the lower traction line (16) is received into the second winding groove of the winch (14) through the first threading hole (18).

5. The device for testing the plastic yield strength of metallic materials according to claim 4, characterized in that, The conduit (21) is perpendicular to the crossbeam of the bracket (23). An electric push rod (22) is provided below the conduit (21). The fixed end of the electric push rod (22) is fixedly installed on the connecting part (17), and the free end is connected to the bottom of the crossbeam.

6. The device for testing the plastic yield strength of metallic materials according to claim 1, characterized in that, The pressure detection assembly includes: a lead screw (4) spanning between the support rods of the auxiliary frame (2), one end of the lead screw (4) being equipped with a drive unit for driving its rotation, and the other end being rotatably fixed to the inner wall of the support rod; the lead screw (4) is threadedly connected to a first hydraulic rod (8) sleeved thereon, the telescopic end of the first hydraulic rod (8) facing downward and equipped with a pressure sensor (6), and a pressing head (7) is fixedly installed on the lower surface of the pressure sensor (6).

7. The device for testing the plastic yield strength of metallic materials according to claim 6, characterized in that, A lifting frame (5) is also provided across the support rods of the auxiliary frame (2). The lifting frame (5) is located below the lead screw (4) and can move up and down along the support rods. The pressure sensor (6) is plugged into the lifting frame (5).

8. The device for testing the plastic yield strength of metallic materials according to claim 1, characterized in that, The retractable clamping assembly includes: a second hydraulic rod (25) fixed to the outer surface of the support rod of the auxiliary frame (2), the second hydraulic rod (25) being perpendicular to the outer surface of the support rod; a clamping frame (9) is installed on the telescopic end of the second hydraulic rod (25) near the support clamping ring assembly, and by driving the second hydraulic rod (25) to move the clamping frame (9) closer to the metal material to be tested until the two come into contact, so as to achieve clamping and fixing of the metal material to be tested.

9. The device for testing the plastic yield strength of metallic materials according to any one of claims 1 to 8, characterized in that, A movable support is provided below the rectangular worktable (1), and the lower surface of the rectangular worktable (1) is fixedly connected to the movable support.

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