Tool for testing hardness of guide wheel

Abstract

The invention relates to the technical field of ring piece test equipment, and discloses a guide wheel hardness test tool, which comprises a workbench, a support piece, a cantilever and a guide force, the supporting piece is fixedly connected with the workbench. The cantilever is fixedly connected with the supporting piece, a preset distance is formed between the cantilever and the workbench, and a limiting part is arranged on the cantilever. The guide wheel is arranged on the cantilever in a sleeving mode, and the limiting part and the supporting piece abut against the guide wheel. The workbench is an installation foundation, the supporting piece is fixedly connected with the workbench to provide stable supporting, the cantilever is fixedly connected with the supporting piece, a preset distance is kept between the cantilever and the workbench, and after the cantilever is sleeved with the guide wheel, the limiting part and the supporting piece abut against the guide wheel. According to the guiding force hardness testing work, the guiding wheel can be limited on the cantilever, the guiding wheel is prevented from rolling or toppling over during hardness testing, the surface of the guiding wheel is prevented from being damaged due to rolling and toppling over, smooth hardness testing is guaranteed, meanwhile, the structure is simple, installation is convenient and fast, and positioning of the guiding wheel can be rapidly achieved.

Description

Technical Field

[0001] This invention relates to the technical field of ring testing equipment, and more specifically to a tooling for testing the hardness of a guide wheel. Background Technology

[0002] Hardness testing of components is a crucial step in ensuring product quality and performance. With the continuous development of industrial technology, the demand for hardness testing of various parts is increasing. Accurate hardness testing provides critical data support for product design, manufacturing, and use, helping to improve product reliability and safety. As a common component in mechanical systems, the hardness of guide wheels has a significant impact on the operational stability and service life of the entire system. Therefore, hardness testing of guide wheels is particularly important.

[0003] Traditionally, when testing the hardness of guide wheels, the method typically involves placing the guide wheel upright and applying pressure to its surface using a hardness tester indenter. To maintain this upright position, the guide wheel is placed on a flat surface. However, when the hardness tester indenter presses on the guide wheel, it is prone to rolling or tipping over. Once the guide wheel rolls or tipps over, its surface will rub or collide with surrounding objects, causing damage to the guide wheel's surface. Summary of the Invention

[0004] In view of this, the present invention provides a tooling for testing the hardness of a guide wheel, in order to solve the problem that the guide wheel is prone to rolling or tipping over when the indenter of the hardness tester is pressed on it.

[0005] In a first aspect, this application provides a tooling for testing the hardness of a guide wheel, characterized in that it comprises: Workbench; The support component is fixedly connected to the worktable; The cantilever is fixedly connected to the support member and has a preset distance from the worktable, and is provided with a limiting part thereon; The guide wheel is fitted onto the cantilever, and the limiting part and the support are both in contact with the guiding force.

[0006] Beneficial effects: The workbench serves as the installation base, with the support component fixedly connected to the workbench for stable support. The cantilever is fixedly connected to the support component and maintains a preset distance from the workbench. After the guide wheel is fitted onto the cantilever, both the limiting part and the support component abut against the guide wheel. This device, used for guiding force hardness testing, can limit the guide wheel on the cantilever, preventing it from rolling or tipping over during hardness testing. This prevents damage to the guide wheel surface due to rolling or tipping, ensuring the smooth progress of the hardness test. Furthermore, it features a simple structure, convenient installation, and rapid positioning of the guide wheel.

[0007] In an optional embodiment, the feature is that it further includes a positioning block, which is fixedly connected to the cantilever, and has a first inverted trapezoidal notch and a second inverted trapezoidal notch spaced apart, and a trapezoidal protrusion thereon. The guide wheel includes a first ring body, a first annular extension and a second annular extension spaced apart, the first annular extension and the second annular extension are both fixedly connected to the inner wall of the first ring body, and the first annular extension, the second annular extension and the inner wall of the first ring body form a first groove. Under the influence of gravity, the guide wheel causes the first annular extension to abut against the bottom wall of the first inverted trapezoidal notch, the second annular extension to abut against the bottom wall of the second inverted trapezoidal notch, and the trapezoidal protrusion to abut against the bottom wall of the first groove.

[0008] Beneficial effects: Under the influence of gravity, the first annular extension of the guide wheel abuts against the bottom wall of the first inverted trapezoidal notch, the second annular extension abuts against the bottom wall of the second inverted trapezoidal notch, and the trapezoidal protrusion abuts against the bottom wall of the first groove. The inverted trapezoidal notch can limit the annular extension of the guide wheel, preventing the guide wheel from moving along the cantilever axis. The cooperation between the trapezoidal protrusion and the first groove can further limit the radial rotation of the guide wheel. This dual limitation improves the stability of the guide wheel, avoids displacement of the guide wheel during testing, better protects the surface of the guide wheel from damage, and improves the accuracy of hardness testing.

[0009] In one alternative embodiment, the limiting portion and the supporting member abut against both ends of the first ring body, respectively.

[0010] Beneficial effects: The limiting part and the support part abut against the two ends of the first ring body of the guide wheel, which can limit the guide wheel from the two ends of the axial direction, restrict the movement of the guide wheel along the cantilever axis, and prevent the guide wheel from shifting position due to axial movement during hardness testing. This ensures that the hardness tester indenter can accurately act on the preset test position of the guide wheel, thereby improving the test accuracy.

[0011] In an optional embodiment, the method further includes a positioning plate, which is fixedly connected to the cantilever and located on both sides of the cantilever, and the positioning plate is provided with a clearance notch and abuts against the second annular extension.

[0012] Beneficial effects: The positioning plate and positioning block are located on both sides of the cantilever. The positioning plate has a clearance notch, and the positioning plate abuts against the second annular extension of the guide wheel. The positioning plate can provide auxiliary restraint to the guide wheel from the other side, and together with the positioning block, form a bidirectional restraint, further restricting the radial rotation of the guide wheel. The clearance notch facilitates the guide wheel being fitted onto the positioning plate and positioning block.

[0013] In one alternative embodiment, at least one first reinforcing rib is further included, which is fixedly connected to the worktable and the support member respectively.

[0014] Beneficial effects: The first reinforcing rib is fixedly connected to both the worktable and the support component. The reinforcing rib enhances the connection strength between the support component and the worktable, preventing the support component from deforming or loosening when bearing the weight of the guide wheel and the pressure of the hardness test. This ensures the installation stability of the cantilever and guide wheel, prevents the guide wheel from shifting, rolling, or tipping over due to deformation of the support component, protects the surface of the guide wheel from damage, and extends the service life of the tooling.

[0015] In one optional embodiment, the free end of the cantilever is a frustum column, and the limiting part is a second ring, which is sleeved on the outer periphery of the frustum column.

[0016] Beneficial effects: The free end of the cantilever is set as a frustum cylinder, and the limiting part is set as a second ring body fitted around the outer circumference of the frustum cylinder. The structure of the frustum cylinder facilitates the quick fitting of the guide wheel onto the cantilever, reducing the installation difficulty of the guide wheel. At the same time, the frustum cylinder can provide a certain guiding effect for the guide wheel, ensuring that the guide wheel is installed in place. The second ring body fitted around the outer circumference of the frustum cylinder can abut against the end of the first ring body of the guide wheel, ensuring the reliability of axial limiting and preventing axial movement of the guide wheel.

[0017] In one optional embodiment, the feature is that it further includes: The shaft is fixedly connected to the side of the frustum cylinder opposite to the cantilever. A baffle is fixedly connected to one end of the shaft that is away from the frustum column. The locking element is rotatably connected to the outer wall of the ring body, and has a semi-circular notch on it; In the locked state, the inner wall of the semi-circular notch is in contact with the shaft; in the unlocked state, the semi-circular notch is separated from the shaft.

[0018] Beneficial effects: When the locking component is in the locked state, the inner wall of the semi-circular notch fits against the shaft, and the baffle abuts against the locking component, preventing the second ring from falling off the frustum cylinder and preventing the second ring from shifting and causing axial limit failure; when the locking component is unlocked, it is convenient to disassemble the second ring and put on and take off the guide wheel, taking into account both the stability of the tooling and the ease of operation.

[0019] In one optional embodiment, the feature is that it further includes: The support is fixedly connected to the workbench; The first column is rotatably connected to the support; The first rod is spaced apart from the first column, and the first rod is rotatably connected to the support; The second rod is rotatably connected to the first rod and also rotatably connected to the first column. The second column is rotatably connected to the first column and has a threaded hole on it; One end of the screw is inserted into the threaded hole and threadedly connected to the threaded hole, while the other end is fixedly connected to the second ring body.

[0020] Beneficial effects: When installing the second ring, by rotating the first rod, the first rod drives the second rod to move, and the second rod drives the first column to rotate around the support, so that the second ring is fitted onto the outer periphery of the frustum column. Then, by rotating the second column, the screw is driven to rise, and the screw drives the second ring to rise, so that the second ring is pressed against the frustum column. Then, the locking member is rotated so that the inner wall of the semi-circular notch fits against the shaft. The baffle limits the locking member along the axial direction of the cantilever, so as to limit the second rod along the axial direction of the cantilever.

[0021] In one optional embodiment, the feature is that it further includes: The first handle is fixedly connected to the second column. A rotating shaft is rotatably connected to the support, and the first rod is sleeved on the outer circumference of the rotating shaft and fixedly connected to the rotating shaft; The second handle is fixedly connected to the rotating shaft.

[0022] Beneficial effects: The first handle allows the operator to easily rotate the second column, thereby adjusting the height of the second ring; the second handle allows the operator to easily rotate the shaft, causing the first rod to rotate, which in turn causes the second rod to move, which in turn causes the first column to rotate around the support, thus causing the second ring to rotate around the support. This reduces the operator's difficulty and improves the ease of tooling operation. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a tooling for testing the hardness of a guide wheel, provided in an embodiment of this application. Figure 2 This is a schematic diagram of another perspective of a tooling for testing the hardness of a guide wheel, provided in an embodiment of this application. Figure 3This is a schematic diagram of the structure of a guide wheel used in guide wheel hardness testing, provided as an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures: 101. Workbench; 201. Support components; 301. Cantilever; 401. Positioning block; 4011. First inverted trapezoidal notch; 4012. Second inverted trapezoidal notch; 4013. Trapezoidal protrusion; 402. Second ring; 403. Positioning plate; 501. First reinforcing rib; 502. Shaft body; 503. Baffle; 504. Locking component; 601. Support; 602. First column; 603. First rod; 604. Second rod; 605. Second column; 607. Screw; 608. First handle; 609. Second handle; 610. Shaft; 701. First ring body; 702. First annular extension; 703. Second annular extension; 704. First groove. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0030] The technical solutions in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of the present invention, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of the present invention without creative effort are also within the protection scope of the present invention.

[0031] This application mainly uses a limiting fixture to fix the guide wheel, which achieves the effect of preventing the guide wheel from rolling or tipping over during hardness testing and ensuring the smooth progress of the test. The following is a further detailed description of this application.

[0032] The tooling for testing the hardness of the guide wheel provided in the embodiments of this application, such as Figures 1 to 3 As shown, the fixture includes a worktable 101, a support member 201, a cantilever 301, and a guide wheel. The support member 201 is fixedly connected to the worktable 101, providing stable support for the entire fixture. The cantilever 301 is fixedly connected to the support member 201 and maintains a preset distance from the worktable 101. The guide wheel is fitted onto the cantilever 301, and both the limiting part and the support member 201 abut against the guide wheel. This effectively limits the position of the guide wheel, preventing it from rolling or tipping over during hardness testing, ensuring the hardness test can proceed smoothly. Because if the guide wheel is unstable during hardness testing, the hardness tester indenter can easily cause the guide wheel to shift when applying pressure; the abutment of the limiting part and the support member 201 prevents this from happening.

[0033] Specifically, such as Figure 1 and Figure 2 As shown, the workbench 101 serves as the mounting base for the entire fixture and can be made of sheet metal, such as steel, which offers high strength and stability. Its surface should be as flat as possible to ensure the stable installation of components such as the support 201. Alternatively, other high-strength materials, such as rigid plastics, can be used to make the workbench 101, as long as they meet the requirements for load-bearing capacity and stability.

[0034] In this embodiment, as Figure 1 and Figure 2As shown, the support component 201 and the worktable 101 can be fixedly connected by welding, which ensures a firm bond between the support component 201 and the worktable 101, guaranteeing the stability of the support. Alternatively, bolts can be used, which facilitates disassembly and maintenance. Bolt connections are also more convenient if adjustments to the tooling or replacement of components are needed later. The support component 201 itself can be a columnar structure, such as a cylindrical metal column, and its material can be carbon steel, which has good strength and resistance to deformation.

[0035] In this embodiment, as Figure 1 and Figure 2 As shown, the cantilever 301 can also be made of metal materials, such as aluminum alloy, which has both strength and light weight. A limiting part is provided on the cantilever 301. The limiting part and the support member 201 abut against both ends of the first ring body 701 of the guide wheel, respectively, limiting the guide wheel from both axial ends to prevent it from moving along the axial direction of the cantilever 301. The shape and structure of the limiting part should be designed according to the characteristics of the guide wheel to ensure effective limiting of the guide wheel.

[0036] In this embodiment, as Figure 3 As shown, the guide wheel includes a first ring body 701, a first annular extension 702 and a second annular extension 703 spaced apart. Both the first annular extension 702 and the second annular extension 703 are fixedly connected to the inner wall of the first ring body 701, and the first annular extension 702, the second annular extension 703, and the inner wall of the first ring body 701 together form a first groove 704. The guide wheel is sleeved on the cantilever 301. Under the action of gravity, the first annular extension 702 abuts against the bottom wall of the first inverted trapezoidal notch 4011, the second annular extension 703 abuts against the bottom wall of the second inverted trapezoid, and the trapezoidal protrusion 4013 abuts against the bottom wall of the first groove 704. This structural design makes the position of the guide wheel on the cantilever 301 more stable. The inverted trapezoidal notch can limit the annular extension of the guide wheel, preventing the guide wheel from moving axially along the cantilever 301. The cooperation between the trapezoidal protrusion 4013 and the first groove 704 can further restrict the radial rotation of the guide wheel.

[0037] In this embodiment, as Figure 1 and Figure 2 As shown, the tooling also includes a positioning block 401, which is fixedly connected to the cantilever 301. The positioning block 401 has a first inverted trapezoidal notch 4011 and a second inverted trapezoidal notch 4012 spaced apart, and a trapezoidal protrusion 4013. The positioning block 401 can be manufactured using a casting process to ensure the precision of the notches and protrusions. The material of the positioning block 401 can be cast iron, which has high wear resistance and strength. The connection between the positioning block 401 and the cantilever 301 can be a keyed connection to ensure that there is no relative rotation between them.

[0038] In this embodiment, as Figure 1 and Figure 2 As shown, a positioning plate 403 is also provided. The positioning plate 403 is fixedly connected to the cantilever 301 and is located on both sides of the cantilever 301, along with the positioning block 401. The positioning plate 403 has a clearance notch and abuts against the second annular extension 703. The positioning plate 403 can provide auxiliary restraint from the other side of the guide wheel, forming a bidirectional restraint with the positioning block 401, further limiting the radial rotation of the guide wheel. The clearance notch facilitates the guide wheel being fitted onto the positioning plate 403 and the positioning block 401. The positioning plate 403 can be made of stainless steel, which has good corrosion resistance.

[0039] In this embodiment, as Figure 1 and Figure 2 As shown, to enhance the connection strength between the support member 201 and the worktable 101, at least one first reinforcing rib 501 is provided, which is fixedly connected to both the worktable 101 and the support member 201. The reinforcing rib can adopt a triangular structure, which has good stability and can effectively distribute the pressure on the support member 201. The material of the reinforcing rib can be the same as that of the support member 201, and it is connected to the worktable 101 and the support member 201 by welding.

[0040] In this embodiment, as Figure 1 and Figure 2 As shown, the free end of the cantilever 301 is a frustum cylinder, and the limiting part is a second ring 402, which is fitted onto the outer circumference of the frustum cylinder. The structure of the frustum cylinder facilitates the quick mounting of the guide wheel onto the cantilever 301, reducing the installation difficulty of the guide wheel. At the same time, the frustum cylinder can provide a certain guiding effect for the guide wheel, ensuring that the guide wheel is installed in place. The second ring 402, fitted onto the outer circumference of the frustum cylinder, can abut against the end of the first ring 701 of the guide wheel, ensuring the reliability of axial limiting and preventing axial movement of the guide wheel. Both the frustum cylinder and the second ring 402 can be manufactured by machining to ensure dimensional accuracy.

[0041] In this embodiment, as Figure 1 and Figure 2 As shown, the device also includes a shaft 502, a baffle 503, and a locking element 504. The shaft 502 is fixedly connected to the side of the frustum-shaped cylinder opposite to the cantilever 301. The baffle 503 is fixedly connected to the end of the shaft 502 opposite to the frustum-shaped cylinder. The locking element 504 is rotatably connected to the outer wall of the ring and has a semi-circular notch. In the locked state, the inner wall of the semi-circular notch fits against the shaft 502; in the unlocked state, the semi-circular notch separates from the shaft 502. The locking element 504 can be operated by rotation, which is convenient and quick. The shaft 502 and the baffle 503 can be manufactured as a single piece to ensure the strength of the connection.

[0042] In this embodiment, as Figure 1 and Figure 2 As shown, it also includes a support 601, a first column 602, a first rod 603, a second rod 604, a second column 605, and a screw 607. The support 601 is fixedly connected to the workbench 101. The first column 602 is rotatably connected to the support 601. The first rod 603 is spaced apart from the first column 602 and is rotatably connected to the support 601. The second rod 604 is rotatably connected to the first rod 603 and also rotatably connected to the first column 602. The second column 605 is rotatably connected to the first column 602 and has a threaded hole. One end of the screw 607 is inserted into the threaded hole and threadedly connected to it, while the other end is fixedly connected to the second ring 402. When installing the second ring 402, the first rod 603 is rotated, which drives the second rod 604 to move. The second rod 604 drives the first column 602 to rotate around the support 601, so that the second ring 402 is fitted onto the outer circumference of the frustum column. Then, the second column 605 is rotated, which drives the screw 607 to rise. The screw 607 drives the second ring 402 to rise, so that the second ring 402 is pressed against the frustum column. Then, the locking member 504 is rotated, so that the inner wall of the semi-circular notch fits against the shaft 502. The baffle limits the locking member 504 along the axial direction of the cantilever 301, so as to limit the second rod 604 along the axial direction of the cantilever 301.

[0043] In this embodiment, as Figure 1 and Figure 2 As shown, for ease of operation, a first handle 608 and a second handle 609 are provided. The first handle 608 is fixedly connected to the second column 605, the rotating shaft 610 is rotatably connected to the support 601, and the first rod 603 is sleeved on the outer circumference of the rotating shaft 610 and fixedly connected to the rotating shaft 610. The second handle 609 is fixedly connected to the rotating shaft 610. The first handle 608 allows the operator to rotate the second column 605 to drive the second column 605 to rotate, thereby adjusting the height of the second ring 402. The second handle 609 allows the operator to rotate the rotating shaft 610 to drive the first rod 603 to rotate. The first rod 603 drives the second rod 604 to move, and the second rod 604 drives the first column 602 to rotate around the support 601, thereby driving the second ring 402 to rotate around the support 601. This reduces the difficulty of operation for the operator and improves the convenience of tooling operation.

[0044] The implementation principle of this embodiment is as follows: This fixture for testing the hardness of a guide wheel achieves effective positioning of the guide wheel through the coordinated operation of its various components. The workbench 101 provides a stable mounting base, the support member 201 and reinforcing ribs ensure structural stability, the cantilever 301 and the limiting part limit the guide wheel axially, the positioning block 401 and the positioning plate 403 limit the guide wheel radially, and the locking member 504 and related transmission mechanisms facilitate the operation and adjustment of the fixture. Compared with the prior art, this fixture can prevent the guide wheel from rolling or tipping during hardness testing, prevent damage to the guide wheel surface due to rolling or tipping, ensure the smooth progress of hardness testing, and at the same time, it has a simple structure, is easy to install, can quickly achieve positioning of the guide wheel, improves the accuracy and efficiency of testing, and extends the service life of the fixture.

[0045] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A fixture for testing the hardness of a guide wheel, characterized in that, include: Workbench (101); The support member (201) is fixedly connected to the worktable (101); The cantilever (301) is fixedly connected to the support (201) and has a preset distance from the worktable (101), and is provided with a limiting part thereon; The guide wheel is sleeved on the cantilever (301), and the limiting part and the support (201) both abut against the guide force.

2. The fixture for testing the hardness of a guide wheel according to claim 1, characterized in that, It also includes a positioning block (401), which is fixedly connected to the cantilever (301), and has a first inverted trapezoidal notch (4011) and a second inverted trapezoidal notch (4012) spaced apart, and a trapezoidal protrusion (4013) is provided on it; The guide wheel includes a first ring body (701), a first annular extension (702) and a second annular extension (703) spaced apart. The first annular extension (702) and the second annular extension (703) are both fixedly connected to the inner wall of the first ring body (701), and the first annular extension (702), the second annular extension (703) and the inner wall of the first ring body (701) enclose a first groove (704). Under the action of gravity, the guide wheel causes the first annular extension (702) to abut against the bottom wall of the first inverted trapezoidal notch (4011), the second annular extension (703) to abut against the bottom wall of the second inverted trapezoid, and the trapezoidal protrusion (4013) to abut against the bottom wall of the first groove (704).

3. The fixture for testing the hardness of a guide wheel according to claim 2, characterized in that, The limiting part and the support member (201) respectively abut against the two ends of the first ring body (701).

4. The fixture for testing the hardness of a guide wheel according to claim 3, characterized in that, It also includes a positioning plate (403), which is fixedly connected to the cantilever (301) and is located on both sides of the cantilever (301) respectively with the positioning block (401). The positioning plate (403) has a clearance notch and abuts against the second annular extension (703).

5. The fixture for testing the hardness of a guide wheel according to any one of claims 1-4, characterized in that, It also includes at least one first reinforcing rib (501), which is fixedly connected to the workbench (101) and the support member (201) respectively.

6. The fixture for testing the hardness of a guide wheel according to claim 5, characterized in that, The free end of the cantilever (301) is a frustum column, and the limiting part is a second ring (402), which is sleeved on the outer periphery of the frustum column.

7. The fixture for testing the hardness of a guide wheel according to claim 6, characterized in that, Also includes: The shaft (502) is fixedly connected to the side of the frustum cylinder opposite to the cantilever (301); The baffle (503) is fixedly connected to one end of the shaft (502) away from the frustum column. The locking element (504) is rotatably connected to the outer wall of the ring body, and has a semi-circular notch thereon; In the locked state, the inner wall of the semi-circular notch is in contact with the shaft (502), and in the unlocked state, the semi-circular notch is separated from the shaft (502).

8. The fixture for testing the hardness of a guide wheel according to claim 7, characterized in that, Also includes: The support (601) is fixedly connected to the workbench (101); The first column (602) is rotatably connected to the support (601); The first rod (603) is spaced apart from the first column (602), and the first rod (603) is rotatably connected to the support (601); The second rod (604) is rotatably connected to the first rod (603) and rotatably connected to the first column (602); The second column (605) is rotatably connected to the first column (602) and has a threaded hole thereon; The screw (607) has one end inserted into the threaded hole and threadedly connected to the threaded hole, and the other end fixedly connected to the second ring (402).

9. The fixture for testing the hardness of a guide wheel according to claim 8, characterized in that, Also includes: The first handle (608) is fixedly connected to the first column (602); A rotating shaft (610) is rotatably connected to the support (601), and the first rod (603) is sleeved on the outer circumference of the rotating shaft (610) and fixedly connected to the rotating shaft (610); The second handle (609) is fixedly connected to the rotating shaft (610).

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