A pedestal for hardness testing

Abstract

The utility model provides a kind of pedestal for hardness test, including test platform main body, workbench and pedestal main body, the upper end of pedestal main body is equipped with placing groove, and the placing groove is placed with special-shaped member main body, and the placing groove is used to tightly adhere special-shaped member main body with it, and realize full contact support, and the surface of special-shaped member main body away from pedestal main body is equipped with special-shaped member test point, and the lower end of pedestal main body is fixedly connected with connecting column, and the inside of workbench is equipped with installation cavity, and the inside of installation cavity is equipped with locating column, and the middle of locating column is fixedly connected with balance disc, for detecting the balance of special-shaped member main body hardness test, and the side of balance disc away from connecting column is equipped with balance groove, and the pedestal main body and placing groove of the utility model are profiled design, so that special-shaped member main body and pedestal main body effectively adhere, realize full contact support, effectively improve the stability and accuracy of test, and whether pedestal main body is offset is judged in the process of inspection.

Description

Technical Field

[0001] This utility model relates to the field of hardness testing technology, and in particular to a hardness testing stand. Background Technology

[0002] Brinell hardness measurement is one of the most widely used methods in material hardness testing. The core principle is to press a cemented carbide ball of a certain diameter into the surface of the material being tested with a specified pressure, hold it for a certain period of time, and then release the pressure. The hardness value HBW is calculated by measuring the diameter of the indentation.

[0003] Commonly used Brinell hardness measuring equipment is shown in the attached figure. Figure 1 The testing platform is relatively small, making testing simple for regular shapes that are easy to place stably. However, for irregularly shaped parts such as automotive chassis forgings, the following problems arise: ① Stable placement is impossible; ② The indenter is more likely to not be in perpendicular contact with the measuring surface, resulting in an indentation that cannot be formed; ③ Repeatability is poor, and errors are large. Slight differences in the placement position and pressing angle of the test product can cause the irregularly shaped part to shift, leading to deviations in the measurement data; ④ Testing efficiency is low, and operation is complex. Due to the small size of the measuring equipment's platform, when testing larger parts such as automotive chassis control arms, manual support is required, and the loading pressure must be adjusted and the holding time controlled to prevent movement, otherwise the measurement data will have increased errors. Summary of the Invention

[0004] The purpose of this utility model is to provide a hardness testing stand, which includes a stand body and a placement groove on the stand body. The placement groove fits tightly with the irregular part body to solve the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a hardness testing stand, including a testing stand body, a worktable and a stand body, the upper end of the stand body is provided with a placement groove, a non-shaped part body is placed in the placement groove, the placement groove is used to tightly fit the non-shaped part body with it and achieve full contact support, the non-shaped part body is provided with non-shaped part test points on the surface of the non-shaped part body away from the stand body, and a connecting column is fixedly connected to the lower end of the stand body; The workbench has an internal mounting cavity, and the mounting cavity has a positioning column. A balance plate is fixedly connected to the middle of the positioning column for testing the balance of the main body of the irregular part during the hardness test. The side of the balance plate away from the connecting column has a balance groove. At least three pressure plates are slidably connected to the inner wall of the mounting cavity, and pressure sensors of the same number as the pressure plates are fixedly connected to the bottom inner wall of the mounting cavity. The top of the pressure plate abuts against the pressure sensor and is used to read the pressure value when testing the hardness of the irregular part body. A fixing column is fixedly connected to the side of the pressure plate facing the positioning column, and a support ball is fixedly connected to the top of the fixing column for balancing support of the balance disc.

[0006] Preferably, the worktable has a connecting hole on the side facing the main body of the base, and the diameter of the connecting hole is larger than the diameter of the connecting column, so as to facilitate the balance detection of the connecting column.

[0007] Preferably, the top end of the connecting column away from the main body of the base is provided with a mounting hole. When the top end of the connecting column is inserted into the mounting cavity, the positioning column is inserted into the mounting hole to position and connect the positioning column and the connecting column.

[0008] Preferably, the test points of the irregular part are collinear with the main body of the pedestal, the connecting column, and the connecting hole to ensure the accuracy of the test data of the irregular part.

[0009] Preferably, the balancing groove is an annular structure with an arc-shaped concave bottom, and the support ball is located in the balancing groove for detecting the tilt of the balancing disc.

[0010] Preferably, the fixing column has an L-shaped structure and is used to transmit the pressure of this part of the balance disc.

[0011] Preferably, the worktable is fixedly connected to a limiting cylinder on the bottom side wall of the mounting cavity, the positioning post is inserted into the middle of the limiting cylinder, and the diameter of the inner side wall of the limiting cylinder is larger than the diameter of the positioning post.

[0012] Preferably, the main body of the test bench has a U-shaped structure, and a lifting platform is fixedly connected between the lower end of the workbench and the main body of the test bench. An emergency stop switch is provided at the end where the main body of the test bench is connected to the lifting platform. A pressure head is provided on the side of the main body of the test bench facing the workbench. A data display screen and an adjustment knob are provided at the end where the main body of the test bench is connected to the pressure head. The data display screen is connected to a pressure sensor. The beneficial effects of this utility model are as follows: 1. The main body of the pedestal and the placement groove adopt a contour-following design, which enables the main body of the irregular part and the main body of the pedestal to fit together effectively, achieving full contact support and effectively improving the stability and accuracy of the test.

[0013] 2. The test points for irregularly shaped parts are collinear with the main body of the test stand, the connecting column, and the connecting hole, ensuring that the hardness measurement point is in the same position of the product each time, effectively improving the repeatability of the test and avoiding measurement errors.

[0014] 3. It is easy to load, unload and replace, and no manual assistance is required during the pressure head descent, pressure loading and pressure holding process, which greatly improves the testing efficiency.

[0015] 4. When testing irregularly shaped parts, the verticality of the pressure sensor can be used to determine whether the test platform has shifted, ensuring the accuracy of the test results.

[0016] 5. This practical support body is suitable for irregularly shaped products with complex shapes, such as automotive chassis forgings. Attached Figure Description

[0017] Figure 1 This is a side view of the main body of the test platform provided by this utility model.

[0018] Figure 2 This is a front view of the test platform body provided by this utility model.

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the pedestal body provided by this utility model.

[0020] Figure 4 This is a schematic diagram showing the connection between the main body of the pedestal and the main body of the irregular part provided by this utility model.

[0021] Figure 5 This is a schematic diagram of the connection between the connecting column and the workbench provided by this utility model.

[0022] Figure 6 This is a schematic diagram of the connection between the connecting column and the balance disc provided by this utility model.

[0023] Figure 7 This is a schematic diagram of the connection between the connecting column and the positioning column provided by this utility model.

[0024] Figure 8 This is a schematic diagram of the connection between the support ball and the pressure plate provided by this utility model.

[0025] In the diagram: 1. Pressure head, 2. Workbench, 3. Lifting platform, 4. Test bench body, 5. Data display screen, 6. Adjustment knob, 7. Emergency stop switch, 8. Base body, 9. Placement slot, 10. Connecting column, 11. Irregular part body, 12. Irregular part test point, 13. Connecting hole, 14. Balance disc, 15. Limiting cylinder, 16. Pressure sensor, 17. Positioning column, 18. Pressure plate, 19. Mounting hole, 20. Balance slot, 21. Support ball, 22. Fixing column. Detailed Implementation To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] See Figures 1-8 This utility model provides a hardness testing stand, comprising a testing table body 4, a worktable 2, and a stand body 8, which are made of... Figure 3 and Figure 4As shown, the upper end of the pedestal body 8 is provided with a placement groove 9, and the irregular part body 11 is placed in the placement groove 9. The placement groove 9 is used to tightly fit the irregular part body 11 with it and achieve full contact support, so as to avoid shaking or displacement during the test due to the irregular shape of the irregular part body, thereby providing a stable foundation for hardness testing and ensuring the accuracy and reliability of the test results.

[0027] The surface of the irregular part body 11 away from the base body 8 is provided with irregular part test points 12. The lower end of the base body 8 is fixedly connected to a connecting column 10. The fixed connection method can also be welding, riveting, screwing or gluing. Depend on Figure 5 and Figure 6 As shown, the workbench 2 has an internal mounting cavity containing a positioning post 17. A connecting hole 13 is located on the side of the workbench 2 facing the main body 8. The diameter of the connecting hole 13 is larger than the diameter of the connecting post 10, facilitating the balance detection of the connecting post 10. A mounting hole 19 is located at the top of the connecting post 10 away from the main body 8. When the top of the connecting post 10 is inserted into the mounting cavity, the positioning post 17 is inserted into the mounting hole 19, thus positioning and connecting the positioning post 17 and the connecting post 10. The irregular part test point 12 is collinear with the main body 8, the connecting post 10, and the connecting hole 13, ensuring the accuracy of the test data for the irregular part body 11. When the main body 3 is installed on the workbench 2, the positioning post 17 and the connecting post 10 are mutually positioned and connected, ensuring that the force direction of the irregular part body 11 during testing is consistent with the overall structural axis of the main body 8. During hardness testing, the force transmission is more direct and uniform, reducing the impact of additional stress caused by deviations in the force direction on the test results, effectively improving the repeatability of the test and avoiding measurement errors.

[0028] Depend on Figure 6 , Figure 7 and Figure 8 As shown, a balance disc 14 is fixedly connected to the middle of the positioning column 17, used to detect the balance of the main body 11 during hardness testing. A balance groove 20 is provided on the side of the balance disc 14 away from the connecting column 10; the balance groove 20 has an annular structure with a concave arc-shaped bottom. Support balls 21 are located at the balance groove 20 and are used to detect the tilt of the balance disc 14. The fixing column 22 has an L-shaped structure and is used to transmit the pressure at this part of the balance disc 14. When the main body 11 of the irregular part shifts during testing, the platform body 8 will drive the connecting column 10 and the positioning column 17 to rotate, causing the balance disc 14 to become unbalanced, resulting in uneven pressure on each support ball 21. When the balance disc 14 is tilted, the support ball 21 can roll along the arc-shaped concave surface of the balance groove 20, which more sensitively reflects the tilt angle and direction of the balance disc 14. At the same time, after the detection is completed, the balance disc 14 will reset due to gravity, and the support ball 21 and the balance groove 20 will be reconnected, so that the balance disc 14 remains horizontal.

[0029] Depend on Figure 5 As shown, at least three pressure plates 18 are slidably connected to the inner wall of the mounting cavity. The same number of pressure sensors 16 as the pressure plates 18 are fixedly connected to the bottom inner wall of the mounting cavity. The top of each pressure plate 18 abuts against the pressure sensor 16, used to read the pressure value during the hardness test of the irregular part body 11. A fixing post 22 is fixedly connected to the side of the pressure plate 18 facing the positioning post 17. A support ball 21 is fixedly connected to the top of the fixing post 22, used to provide balance support for the balance disc. When the balance disc 14 tilts, the pressure of the pressure plates 18 at different positions on the pressure sensor 16 is different, resulting in inaccurate test results, requiring retesting. The L-shaped fixing post 22 can accurately transmit pressure to the pressure plate 18 and the pressure sensor 16, reducing pressure loss and deformation during transmission, ensuring that the pressure value read by the pressure sensor 16 can truly reflect the actual force on that part of the balance disc 14, and improving the accuracy of pressure detection.

[0030] The workbench 2 is fixedly connected to the bottom side wall of the mounting cavity by a limiting cylinder 15. The positioning post 17 is inserted into the middle of the limiting cylinder 15, and the inner diameter of the limiting cylinder 15 is larger than the diameter of the positioning post 17. The limiting cylinder 15 and the connecting hole 13 cooperate with each other, allowing the connecting post 10 and the positioning post 17 to have appropriate small displacement space when subjected to external force, so as to reflect the change of equilibrium state, while limiting their excessive displacement, ensuring the stability and reliability of the entire testing system.

[0031] Depend on Figure 1 and Figure 2 As shown, the main body 4 of the test bench has a U-shaped structure. A lifting platform 3 is fixedly connected between the lower end of the workbench 2 and the main body 4 of the test bench. An emergency stop switch 7 is provided at the end where the main body 4 of the test bench and the lifting platform 3 are connected. A pressure head 1 is provided on the side of the main body 4 facing the workbench 2. A data display screen 5 and an adjustment knob 6 are provided at the end where the main body 4 of the test bench and the pressure head 1 are connected. A hydraulic rod is provided inside the lifting platform 3. The adjustment knob 6 and the emergency stop switch 7 can control the operation of the hydraulic rod, so that the workbench 2 can rise and stop suddenly. The hardness tester is a mature existing technology. It is not shown in detail that the pressure head 1 and the connection between the lifting platform 3 and the internal components of the main body 4 of the test bench do not affect the integrity of this solution. The data display screen 5 is connected to the pressure sensor 16. The data display screen 5 can display the pressure of the pressure sensor 16 at different positions to determine whether the main body 8 of the test bench is offset when testing the irregular part body 11, so as to ensure the accuracy of the test results.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements 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 hardness testing stand, comprising a testing stage body (4), a worktable (2), and a stand body (8), characterized in that: The upper end of the pedestal body (8) is provided with a placement groove (9), and a non-shaped part body (11) is placed in the placement groove (9). The placement groove (9) is used to tightly fit the non-shaped part body (11) with it and achieve full contact support. The non-shaped part body (11) is provided with non-shaped part test points (12) on the surface away from the pedestal body (8). The lower end of the pedestal body (8) is fixedly connected with a connecting column (10). The workbench (2) has an installation cavity inside, and a positioning column (17) is provided inside the installation cavity. A balance plate (14) is fixedly connected in the middle of the positioning column (17) to detect the balance of the main body (11) of the irregular part during the hardness test. A balance groove (20) is provided on the side of the balance plate (14) away from the connecting column (10). At least three pressure plates (18) are slidably connected to the inner wall of the mounting cavity, and pressure sensors (16) of the same number as the pressure plates (18) are fixedly connected to the bottom inner wall of the mounting cavity. The top of the pressure plate (18) abuts against the pressure sensor (16) and is used to read the pressure value when testing the hardness of the irregular part body (11). The pressure plate (18) is fixedly connected to a fixing column (22) on the side facing the positioning column (17), and a support ball (21) is fixedly connected to the top of the fixing column (22) for balancing support of the balance plate (14).

2. The hardness testing stand according to claim 1, characterized in that: The workbench (2) has a connecting hole (13) on the side facing the main body (8). The diameter of the connecting hole (13) is larger than the diameter of the connecting column (10), which facilitates the balance detection of the connecting column (10).

3. The hardness testing stand according to claim 1, characterized in that: The top of the connecting column (10) away from the main body (8) is provided with a mounting hole (19). When the top of the connecting column (10) is inserted into the mounting cavity, the positioning column (17) is inserted into the mounting hole (19) to position and connect the positioning column (17) and the connecting column (10).

4. A hardness testing stand according to claim 1, characterized in that: The test point (12) of the irregular part is collinear with the main body (8), the connecting column (10), and the connecting hole (13) to ensure the accuracy of the test data of the main body (11) of the irregular part.

5. A hardness testing stand according to claim 1, characterized in that: The balancing groove (20) is a ring structure, and the bottom of the balancing groove (20) is an arc-shaped concave surface. The support ball (21) is located in the balancing groove (20) and is used to detect the tilt of the balancing disk (14).

6. A hardness testing stand according to claim 1, characterized in that: The fixed column (22) has an L-shaped structure and is used to transmit the pressure of the balance disc (14) at this part.

7. A hardness testing stand according to claim 1, characterized in that: The workbench (2) is fixedly connected to the bottom side wall of the mounting cavity with a limiting cylinder (15). The positioning column (17) is inserted into the middle of the limiting cylinder (15). The inner side wall diameter of the limiting cylinder (15) is larger than the diameter of the positioning column (17).

8. A hardness testing stand according to claim 1, characterized in that: The main body (4) of the test bench is U-shaped. A lifting platform (3) is fixedly connected between the lower end of the workbench (2) and the main body (4) of the test bench. An emergency stop switch (7) is provided at the end where the main body (4) of the test bench and the lifting platform (3) are connected. A pressure head (1) is provided on the side of the main body (4) facing the workbench (2). A data display screen (5) and an adjustment knob (6) are provided at the end where the main body (4) of the test bench and the pressure head (1) are connected. The data display screen (5) is connected to a pressure sensor (16).

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