An implant coating shear strength testing device

Abstract

The present invention belongs to the technical field of implant mechanical testing, and discloses an implant coating shear strength testing device, which includes an upper transfer tooling flange and a lower transfer tooling flange connected to a testing machine. The upper transfer tooling flange and the lower transfer tooling flange have the same structure and are symmetrically arranged up and down. The upper transfer tooling flange is connected to an upper fixture assembly, and the lower transfer tooling flange is connected to a lower fixture assembly. The upper fixture assembly and the lower fixture assembly have the same structure and are rotationally symmetric at 180°. The structures of the upper fixture assembly and the lower fixture assembly both include a clamping block and a connecting block. The two clamping blocks are arranged oppositely and are used for clamping a shear specimen, and the shear specimen is fixed by a specimen fixing shaft and a fastening bolt. The two connecting blocks are used to connect the two clamping blocks to the upper transfer tooling flange and the lower transfer tooling flange respectively. The present invention forms a disassembled structure that can be split up and down, left and right, reduces the installation and disassembly weight, avoids the difficulty of overall replacement of traditional fixtures, and improves the service life of the fixture assembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of implant mechanical testing, and specifically, relates to a testing device for the shear strength of an implant coating. Background Art

[0002] Most medical orthopedic implants are made of metal or ceramic. During use, the materials are incompatible with tissues and organs, and problems such as wear and human rejection are likely to occur. Some implants are coated with a porous coating with biocompatibility to facilitate bone growth and reduce problems such as wear and rejection. Orthopedic implants such as joint prostheses have extremely high requirements for the bonding strength of the contact interface with human bones and their own stability.

[0003] To ensure the bonding strength of the implant coating with the contact surface of human bones, it is necessary to test the coating. During the fatigue test according to YY / T0988-13-2016, the long axis of the shear specimen is perpendicular to the direction of the shear load, and the shear load passes through the center line of the fixture assembly. The test continues until the specimen fails or reaches a predetermined number of cycles, where failure is defined as: complete detachment of the coating, visible cracks at a specified magnification, cracks of a specified size, and other failure criteria. This test evaluates the adhesion and bonding of the coating covering the metal substrate in the shear fatigue mode.

[0004] The existing testing device for the shear strength of an implant coating consists of an upper fixture, a lower fixture, an upper transfer tooling flange, a lower transfer tooling flange, an upper hinge fixator, a lower hinge fixator, a shear specimen, and a specimen fixing shaft. The upper transfer tooling flange is connected to the actuator of the testing machine, and the lower transfer tooling flange is connected to the sensor of the testing machine. The upper and lower hinge fixators are connected to the upper and lower transfer tooling flanges through nuts. Since the fixture body of the existing device is relatively heavy, two persons are required to assist in the installation during the installation of the fixture. Summary of the Invention

[0005] The present invention aims to solve the technical problems that the existing shear test fixture is relatively heavy and difficult to install and disassemble, and provides a testing device for the shear strength of an implant coating, which adopts a decomposed fixture structure to reduce the weight and facilitate installation.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0007] The present invention provides a testing device for the shear strength of an implant coating, including an upper transfer tooling flange and a lower transfer tooling flange connected to a testing machine, wherein the upper transfer tooling flange and the lower transfer tooling flange have the same structure and are symmetrically arranged up and down; the upper transfer tooling flange is connected to an upper fixture assembly, and the lower transfer tooling flange is connected to a lower fixture assembly;

[0008] The upper fixture assembly and the lower fixture assembly have the same structure and are rotationally symmetric by 180°. Both the upper fixture assembly and the lower fixture assembly include clamping blocks and connecting blocks; the two clamping blocks are arranged oppositely and are used for clamping the shear specimen, and the shear specimen is fixed by a specimen fixing shaft and a fastening bolt; the two connecting blocks are used to connect the two clamping blocks to the upper transfer tooling flange and the lower transfer tooling flange respectively;

[0009] The shear specimen is installed in the specimen installation holes of the two clamping blocks, and the axis of the shear specimen is perpendicular to the opposite surfaces of the two clamping blocks; the shear specimen includes a first specimen section and a second specimen section, the first specimen section and the second specimen section are connected by an adhesive, and a coating is provided at the connection; the coating is located in the gap between the two clamping blocks;

[0010] The two specimen fixing shafts are respectively installed in the fixing shaft installation holes of the two clamping blocks, the axis of the specimen fixing shaft is perpendicular to the axis of the shear specimen, and is parallel to the opposite surfaces and the upper and lower surfaces of the two clamping blocks; the specimen fixing shaft installed on the upper fixture assembly is located above the shear specimen, and the specimen fixing shaft installed on the lower fixture assembly is located below the shear specimen; the specimen fixing shaft is provided with an arc concave portion at the intersection with the shear specimen, and the arc concave portion is in contact with the shear specimen;

[0011] The fastening bolts are respectively installed in the fastening bolt installation holes of the two clamping blocks, and the axis of the fastening bolt is perpendicular to the upper and lower surfaces of the clamping block; the fastening bolt installation hole communicates with the specimen installation hole so that the tail end of the fastening bolt can clamp the shear specimen; the fastening bolt installed on the upper fixture assembly is located below the shear specimen, and the fastening bolt installed on the lower fixture assembly is located above the shear specimen;

[0012] The clamping block is provided with a first inclined angle groove, and the connecting block is provided with a second inclined angle groove. The first inclined angle groove and the second inclined angle groove cooperate to realize the mutual biting and clamping of the clamping block and the connecting block; and the clamping block and the connecting block are fixedly connected by a transverse screw and a longitudinal screw.

[0013] Further, the upper part of the upper transfer tooling flange is fixedly connected to the actuator of the testing machine by bolts, and the lower part of the lower transfer tooling flange is fixedly connected to the sensor of the testing machine by bolts.

[0014] Further, the specimen installation holes penetrate through the clamping blocks, and the two clamping blocks are arranged oppositely with the axes of the specimen installation holes coinciding.

[0015] Further, the first specimen section and the second specimen section are exactly the same. The binder is disposed at the end of the first specimen section, and the coating is disposed at the end of the second specimen section.

[0016] Further, the fixed shaft mounting hole penetrates through the clamping block, and a part of the intersection of the fixed shaft mounting hole and the specimen mounting hole overlaps.

[0017] Further, the specimen fixing shaft includes a smooth shaft section and a threaded section. A limiting portion is provided at the end of the smooth shaft section; the limiting portion is stuck at one end of the specimen mounting hole, and an external internal angle nut is installed at the other end of the specimen mounting hole on the threaded section to lock the specimen fixing shaft; the arc concave portion is provided at the intersection of the smooth shaft section and the shear specimen.

[0018] Further, the first inclined angle groove is provided at one end of the clamping block close to the connecting block. The first inclined angle is composed of a horizontal plane and an inclined plane. The horizontal plane is parallel to the upper and lower surfaces of the clamping block, and the inclined plane inclines from the root of the first inclined angle groove towards the connecting block.

[0019] Further, the connecting block includes a platform base, a boss and a first single-ear plate. The boss and the platform base form the second inclined angle groove. The second inclined angle groove is composed of a horizontal plane and an inclined plane. The horizontal plane is the surface of the platform base close to the clamping block, and the inclined plane inclines from the root of the second inclined angle groove towards the clamping block; the first single-ear plate is used to connect the lower adapter tooling flange.

[0020] Still further, the connecting block is provided with a threaded through hole and a countersunk threaded hole; the threaded through hole penetrates from the inner surface of the connecting block to the second inclined angle groove. The clamping block is provided with a first threaded blind hole corresponding to the threaded through hole. The transverse screw is threadedly connected to the threaded through hole and the first threaded blind hole, and the axis of the transverse screw is perpendicular to the inner surface of the clamping block; the countersunk threaded hole penetrates from the bottom surface to the top surface of the platform base. The clamping block is provided with the second threaded blind hole corresponding to the countersunk threaded hole. The longitudinal screw is threadedly connected to the countersunk threaded hole and the second threaded blind hole, and the axis of the longitudinal screw is perpendicular to the upper and lower surfaces of the clamping block.

[0021] Furthermore, both the upper transfer tooling flange and the lower transfer tooling flange are composed of a transfer shaft and a transfer flange; the transfer shaft includes a first U-shaped joint and a second U-shaped joint, the first U-shaped joint is connected to the connection block by a cylindrical pin, and the second U-shaped joint is connected to the transfer flange by a cylindrical pin; the transfer flange includes a flange plate and a second single-ear plate; the flange plate is connected to the actuator or sensor of the testing machine, and the second single-ear plate is connected to the second U-shaped joint by a cylindrical pin.

[0022] The beneficial effects of the present invention are as follows:

[0023] (1) For the implant coating shear strength testing device of the present invention, the fixture part is designed as an upper and lower fixture assembly in cooperation, and each fixture assembly is composed of a clamping block and a connection block, thus forming a detachable structure that can be disassembled up, down, left, and right, reducing the weight of installation and disassembly and avoiding the difficulty of overall replacement of traditional fixtures.

[0024] (2) For the implant coating shear strength testing device of the present invention, the clamping blocks and connection blocks of the upper and lower fixture assemblies are clamped tightly by the bevel angle grooves and are connected with transverse and longitudinal screws. After applying the load in this way, the clamping blocks and connection blocks act together, which can effectively restrain the lateral displacement generated during the shear test and avoid unnecessary misalignment, thereby improving the service life of the fixture assembly. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the implant coating shear strength testing device according to the embodiment of the present invention;

[0026] Figure 2 It is a structural assembly diagram of the upper and lower fixture assemblies of the implant coating shear strength testing device according to the embodiment of the present invention;

[0027] Figure 3 It is an exploded view of the structure of the upper and lower fixture assemblies of the implant coating shear strength testing device according to the embodiment of the present invention;

[0028] Figure 4 It is a schematic structural diagram of the lower clamping block of the implant coating shear strength testing device according to the embodiment of the present invention;

[0029] Figure 5 It is a schematic structural diagram of the lower connection block of the implant coating shear strength testing device according to the embodiment of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the lower transfer tooling flange of the implant coating shear strength testing device according to the embodiment of the present invention;

[0031] Figure 7Schematic structural diagram of the shear specimen in the implant coating shear strength testing device according to an embodiment of the present invention;

[0032] Figure 8 Schematic structural diagram of the specimen fixing shaft in the implant coating shear strength testing device according to an embodiment of the present invention.

[0033] In the above figures: 1. Upper fixture assembly; 2. Lower fixture assembly; 3. Upper adapter tooling flange; 4. Lower adapter tooling flange; 5. Shear specimen; 501. First specimen section; 502. Second specimen section; 503. Adhesive; 504. Coating; 6. Specimen fixing shaft; 601. Smooth shaft section; 602. Threaded section; 603. Limiting part; 604. Arc concave part; 7. Clamping block; 701. Specimen mounting hole; 702. Fixing shaft mounting hole; 703. Fastening bolt mounting hole; 704. First threaded blind hole; 705. Second threaded blind hole; 8. Connecting block; 801. Platform seat; 802. Boss; 803. First single ear plate; 804. Threaded through hole; 805. Countersunk threaded hole; 9. Adapter shaft; 901. First U-shaped joint; 902. Second U-shaped joint; 10. Adapter flange; 1001. Flange plate; 1002. Second single ear plate. Specific embodiments

[0034] To further understand the content, features and effects of the present invention, the following embodiments are exemplified and described in detail with reference to the accompanying drawings:

[0035] As shown in Figure 1 In this embodiment, an implant coating shear strength testing device is provided, which mainly consists of an upper fixture assembly 1, a lower fixture assembly 2, an upper adapter tooling assembly 3, a lower adapter tooling flange 4, a shear specimen 5 and a specimen fixing shaft 6. The upper part of the upper adapter tooling flange 3 is fixedly connected to the actuator of the testing machine by bolts, and the lower part of the lower adapter tooling flange 4 is fixedly connected to the sensor of the testing machine by bolts. The upper fixture assembly 1 is connected to the upper adapter tooling assembly 3, the lower fixture assembly 2 is connected to the lower adapter tooling flange 4, and the shear specimen 5 and the specimen fixing shaft 6 are installed in the upper fixture assembly 1 and the lower fixture assembly 2.

[0036] As shown in Figure 2 and Figure 3 In the figures, the upper fixture assembly 1 and the lower fixture assembly 2 have the same structure and are rotationally symmetric by 180°, that is, the upper fixture assembly 1 is symmetric with the lower fixture assembly 2 after rotating 180° in the vertical plane with the shear specimen 5 as the axis.

[0037] The upper fixture assembly 1 and the lower fixture assembly 2 both include a clamping block 7 and a connecting block 8. The clamping block 7 is used to mount the shear specimen 5 and the specimen fixing shaft 6, and the connecting block 8 is used to connect the clamping block 7 to the upper adapter tooling flange 3 or the lower adapter tooling flange 4. The clamping blocks 7 of the upper fixture assembly 1 and the lower fixture assembly 2 are arranged opposite to each other with a spacing of about 2 mm, and the lower surface of the connecting block 8 of the upper fixture assembly 1 is higher than the upper surface of the clamping block 7 of the lower fixture assembly 2, and the upper surface of the connecting block 8 of the lower fixture assembly 2 is lower than the lower surface of the clamping block 7 of the upper fixture assembly 1.

[0038] The inner sides of the clamping block 7 and the connecting block 8 both refer to the opposite sides of the upper fixture assembly 1 and the lower fixture assembly 2, and the outer sides of the clamping block 7 and the connecting block 8 both refer to the opposite sides of the upper fixture assembly 1 and the lower fixture assembly 2.

[0039] As Figure 4 shown, the main body of the clamping block 7 is a cuboid structure, and its inner surface is provided with a first inclined angle groove at one end adjacent to the connecting block 8 for cooperating with the second inclined angle groove of the connecting block 8. The first inclined angle groove is composed of a horizontal plane and an inclined plane, where the horizontal plane is parallel to the upper and lower surfaces of the clamping block 7, and the inclined plane is inclined from the root of the first inclined angle groove towards the connecting block 8.

[0040] The clamping block 7 is provided with a specimen mounting hole 701, a fixing shaft mounting hole 702, and a fastening bolt mounting hole 70.

[0041] The specimen mounting hole 701 penetrates through the clamping block 7, and the axis of the specimen mounting hole 701 is perpendicular to the inner surface of the clamping block 7. After the two clamping blocks 7 are arranged opposite to each other, the axes of the two specimen mounting holes 701 coincide. The two specimen mounting holes 701 are used to jointly mount the shear specimen 5, and the inner diameter of the specimen mounting hole 211 is slightly larger than the outer diameter of the shear specimen 5. Preferably, on the inner surface of the clamping block 7, the specimen mounting hole 701 is located at the middle position of the part of the clamping block 7 except for the first inclined angle groove.

[0042] The fixing shaft mounting hole 702 penetrates through the clamping block 7, the axis of the fixing shaft mounting hole 702 is perpendicular to the axis of the specimen mounting hole 701, and is parallel to both the upper and lower surfaces and the inner surface of the clamping block 7. The fixing shaft mounting hole 702 of the upper fixture assembly 1 is located above the specimen mounting hole 701, and the fixing shaft mounting hole 702 of the lower fixture assembly 2 is located below the specimen mounting hole 701. Part of the intersection of the fixing shaft mounting hole 702 and the specimen mounting hole 701 overlaps. The fixing shaft mounting holes 702 of the clamping blocks 7 of the upper fixture assembly 1 and the lower fixture assembly 2 are respectively used to mount a specimen fixing shaft 6, and the specimen fixing shaft 6 is used to firmly fix the shear specimen 5.

[0043] The fastening bolt mounting holes 703 of the upper fixture assembly 1 are provided at the lower part of its clamping block 7, and the fastening bolt mounting holes 703 of the lower fixture assembly 2 are provided at the upper part of its clamping block 7. The axis of the fastening bolt mounting hole 703 is perpendicular to the upper and lower surfaces of the clamping block 7 and communicates with the specimen mounting hole 701. Fastening bolts are respectively installed in the two fastening bolt mounting holes 703, and the fastening bolts are threadedly connected with the fastening bolt mounting holes 703. The tail end of the fastening bolt clamps the shear specimen 5 to prevent the shear specimen 5 from rotating.

[0044] As Figure 5 shown, the connecting block 8 includes a platform base 801, a boss 802 and a first single-ear plate 803. The boss 802 and the first single-ear plate 803 are integrally connected to the platform base 801 inside the connecting block 8. The boss 802 is located on the side close to the clamping block 7, and the first single-ear plate 803 is located on the side far from the clamping block 7. A second inclined angle groove is formed between the platform base 801 and the boss 802, and the second inclined angle groove is used to cooperate with the first inclined angle groove of the clamping block 7. The second inclined angle groove is composed of a horizontal plane and an inclined plane, where the horizontal plane is the surface of the platform base 801 close to the clamping block 7, and the inclined plane inclines from the root of the second inclined angle groove towards the clamping block 7. The first single-ear plate 803 is used to connect with the lower adapter tooling flange 4, so that the lower fixture assembly 2 and the lower adapter tooling flange 4 are connected into a stressed whole.

[0045] The mutual engagement and clamping of the first inclined angle groove and the second inclined angle groove realize the effective connection between the clamping block 7 and the connecting block 8, so as to better restrain the lateral displacement generated during the test and avoid unnecessary dislocation.

[0046] Moreover, the clamping block 7 and the connecting block 8 are fixedly connected by transverse screws and longitudinal screws. Specifically, each connecting block 8 is provided with a threaded through hole 804 and two counterbore threaded holes 805. The threaded through hole 804 penetrates from the inner surface of the connecting block 8 to the second inclined angle groove. The clamping block 7 is provided with a first threaded blind hole 704 corresponding to the threaded through hole 804. Through the threaded connection of the transverse screw with the threaded through hole 804 and the first threaded blind hole 704, the clamping block 7 and the connecting block 8 are fastened in the horizontal direction, and the axis of the transverse screw is perpendicular to the inner surface of the clamping block 7. The two counterbore threaded holes 805 penetrate from the bottom surface to the top surface of the platform base 801 near the outside of the connecting block 8. The clamping block 7 is provided with a second threaded blind hole 705 corresponding to the counterbore threaded hole 805. Through the threaded connection of the longitudinal screw with the counterbore threaded hole 805 and the second threaded blind hole 705, the clamping block 7 and the connecting block 8 are fastened in the vertical direction, and the axis of the longitudinal screw is perpendicular to the upper and lower surfaces of the clamping block 7.

[0047] The upper adapter tooling flange 3 and the lower adapter tooling flange 4 have the same structure and are symmetrically arranged up and down. The specific structure of the upper adapter tooling flange 3 and the lower adapter tooling flange 4 belongs to the prior art.

[0048] As shown Figure 6 in the figure, both the upper adapter tooling flange 3 and the lower adapter tooling flange 4 are composed of an adapter shaft 9 and an adapter flange 10 connected together.

[0049] The adapter shaft 9 includes a first U-shaped joint 901 and a second U-shaped joint 902. The first U-shaped joint 901 is used to connect with the connecting block 8, and the second U-shaped joint 902 is used to connect with the adapter flange 10. Both the first U-shaped joint 901 and the second U-shaped joint 902 are composed of double ear plates arranged in parallel with each other, and the double ear plates of the first U-shaped joint 901 and the double ear plates of the second U-shaped joint 902 are arranged at 90°. The double ear plates of the first U-shaped joint 901 are parallel to the first single ear plate 803 of the connecting block 8. After the first single ear plate 221 is inserted between the double ear plates of the first U-shaped joint 421, it is connected through a cylindrical pin to the first single ear plate 221 and the double ear plates of the first U-shaped joint 421 to realize the fixed connection between the adapter shaft 9 and the connecting block 8.

[0050] The adapter flange 10 includes a flange plate 1001 and a second single ear plate 1002 arranged at the center of the flange plate. The flange plate 1001 is used to connect to the actuator or sensor of the testing machine through bolts, and the second single ear plate 1002 is used to connect with the adapter shaft 9. The second single ear plate 1002 is parallel to the double ear plates of the second U-shaped joint 902 of the adapter shaft 9. After the second single ear plate 1002 is inserted between the double ear plates of the second U-shaped joint 902, it is connected through a cylindrical pin to the second single ear plate 1002 and the double ear plates of the second U-shaped joint 902 to realize the fixed connection between the adapter flange 10 and the adapter shaft 9.

[0051] As shown Figure 7 in the figure, the shear specimen 5 is a cylindrical structure, including a first specimen section 501 and a second specimen section 502 that are exactly the same. An adhesive 503 is provided at the end of the first specimen section 501, and a coating 504 is provided at the end of the second specimen section 502. The adhesive 503 is in contact with the coating 504 to connect the first specimen section 501 and the second specimen section 502 into a whole.

[0052] After the clamping block 7 of the upper fixture assembly 1 is in contact with the clamping block 7 of the lower fixture assembly 2, the shear specimen 5 is inserted into the specimen mounting hole 701 of the clamping block 7 and has a clearance fit with the specimen mounting hole 701. The adhesive 503 and the coating 504 of the shear specimen 5 are located in the gap between the clamping blocks 7 of the upper fixture assembly 1 and the lower fixture assembly 2. During the test, the shear load should be parallel to the plane where the coating 504 is located to determine the maximum bonding strength of the coating 504 or the bonding strength on the surface of the coating 504.

[0053] The shear specimen 5 installed in the upper fixture assembly 1 and the lower fixture assembly 2 is fixed by the specimen fixing shaft 6 and the fastening bolts installed through the upper fixture assembly 1 and the lower fixture assembly 2, so as to effectively limit the shear specimen 5 and ensure that the shear specimen 5 does not undergo lateral displacement and torsion during the shearing process. For shear specimens 5 with different outer diameters, they are fixed by the specimen fixing shaft 6 and the fastening bolts, enabling the testing device to adapt to various specifications of shear specimens 5.

[0054] As Figure 7 shown, the specimen fixing shaft 6 includes a smooth shaft section 601 and a threaded section 602 that are integrally connected. A limiting portion 603 is provided at the end of the smooth shaft section 601. The specimen fixing shaft 6 is inserted into the fixing shaft mounting hole 702 of the clamping block 7, and its limiting portion 603 is stuck at one end of the specimen mounting hole 701. The smooth shaft section 601 is located within the fixing shaft mounting hole 702, and the threaded section 602 extends out of the other end of the specimen mounting hole 701 and is locked and fixed by installing an external internal angle nut on the threaded section 602. An arc concave portion 604 is provided at the intersection of the smooth shaft section 601 and the shear specimen 5. By contacting the upper or lower side of the circumferential surface of the shear specimen 5 through the arc concave portion 604, the specimen fixing shaft 6 clamps the shear specimen 5. Use a wrench to gradually screw the external internal angle nut into the threaded section 602 of the specimen fixing shaft 6, control the wrench torque according to the required pre-tightening force, and make the shear specimen 5 tightly clamped with the arc concave portion 604 of the specimen fixing shaft 6, ensuring the versatility of the shear specimen 5 and facilitating replacement.

[0055] In this way, the specimen fixing shaft 6 installed in the upper fixture assembly 1 is located above the specimen mounting hole 701, and the specimen fixing shaft 6 installed in the lower fixture assembly 2 is located below the specimen mounting hole 701. The two specimen fixing shafts 6 fix the two ends of the shear specimen 5 from the upper and lower directions respectively, and cooperate with the fastening bolts arranged in the opposite direction to the specimen fixing shaft 6.

[0056] For the implant coating shear strength testing device of the present invention, the upper fixture assembly 1 and the lower fixture assembly 2 are rotatably arranged relative to each other by 180°, meeting the requirements of the shear loading test. During the fatigue test, the shear specimen 5 is centered and fixed in the specimen mounting holes 701 of the upper fixture assembly 1 and the lower fixture assembly 2, ensuring that the coating 504 is located in the gap between the two clamping blocks 7, and the testing plane of the coating 504 is parallel to the axial load. Install the testing device on the testing machine, control the upper fixture assembly 1 and the lower fixture assembly 2 to apply a preload to the shear specimen 5 through the computer terminal, adjust the program to conduct the test, design the force speed and the loading termination condition, and conduct the shear fatigue test.

[0057] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many specific transformations in form without departing from the spirit of the invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. An implant coating shear strength testing device, comprising an upper transfer tooling flange and a lower transfer tooling flange connected to a testing machine, wherein the upper transfer tooling flange and the lower transfer tooling flange have the same structure and are symmetrically arranged up and down; characterized in that, The upper adapter tooling flange is connected to the upper fixture assembly, and the lower adapter tooling flange is connected to the lower fixture assembly; The upper fixture assembly and the lower fixture assembly have the same structure and are rotationally symmetric by 180°. The structures of the upper fixture assembly and the lower fixture assembly both include clamping blocks and connecting blocks; the two clamping blocks are arranged oppositely and are used for clamping the shear specimen, and the shear specimen is fixed by a specimen fixing shaft and fastening bolts; the two connecting blocks are used to connect the two clamping blocks to the upper adapter tooling flange and the lower adapter tooling flange respectively; The shear specimen is installed in the specimen installation holes of the two clamping blocks, and the axis of the shear specimen is perpendicular to the opposite surfaces of the two clamping blocks; the shear specimen includes a first specimen section and a second specimen section, the first specimen section and the second specimen section are connected by an adhesive, and a coating is provided at the joint; the coating is located in the gap between the two clamping blocks; The two specimen fixing shafts are respectively installed in the fixing shaft installation holes of the two clamping blocks, the axis of the specimen fixing shaft is perpendicular to the axis of the shear specimen, and is parallel to the opposite surfaces and the upper and lower surfaces of the two clamping blocks; the specimen fixing shaft installed on the upper fixture assembly is located above the shear specimen, and the specimen fixing shaft installed on the lower fixture assembly is located below the shear specimen; the specimen fixing shaft is provided with an arc recess at the intersection with the shear specimen, and the arc recess is in contact with the shear specimen; The fastening bolts are respectively installed in the fastening bolt installation holes of the two clamping blocks, and the axis of the fastening bolt is perpendicular to the upper and lower surfaces of the clamping block; the fastening bolt installation hole communicates with the specimen installation hole so that the tail end of the fastening bolt can clamp the shear specimen; the fastening bolt installed on the upper fixture assembly is located below the shear specimen, and the fastening bolt installed on the lower fixture assembly is located above the shear specimen; The clamping block is provided with a first inclined angle groove, and the connecting block is provided with a second inclined angle groove. The first inclined angle groove and the second inclined angle groove cooperate to realize the mutual biting and clamping of the clamping block and the connecting block; and the clamping block and the connecting block are fixedly connected by transverse screws and longitudinal screws.

2. The implant coating shear strength testing device according to claim 1, wherein The upper part of the upper adapter tooling flange is fixedly connected to the actuator of the testing machine by bolts, and the lower part of the lower adapter tooling flange is fixedly connected to the sensor of the testing machine by bolts.

3. An implant coating shear strength testing device according to claim 1, characterized in that, The specimen installation hole penetrates through the clamping block, and the two clamping blocks are arranged oppositely with the axes of the specimen installation holes coinciding.

4. The implant coating shear strength testing device according to claim 1, characterized in that, The first specimen section and the second specimen section are exactly the same, the adhesive is provided at the end of the first specimen section, and the coating is provided at the end of the second specimen section.

5. The implant coating shear strength testing device according to claim 1, characterized in that, The fixing shaft installation hole penetrates through the clamping block, and a part of the intersection of the fixing shaft installation hole and the specimen installation hole overlaps.

6. The implant coating shear strength testing device according to claim 1, characterized in that, The specimen fixing shaft includes a smooth shaft section and a threaded section, and a limiting portion is provided at an end of the smooth shaft section; the limiting portion is stuck at one end of the specimen mounting hole, and an external internal angle nut is mounted at the other end of the specimen mounting hole on the threaded section to lock the specimen fixing shaft; the arc concave portion is provided at an intersection of the smooth shaft section and the shear specimen.

7. An implant coating shear strength testing device according to claim 1, characterized in that, The first inclined angle groove is provided at an end of the clamping block close to the connecting block. The first inclined angle is composed of a horizontal plane and an inclined plane, wherein the horizontal plane is parallel to the upper and lower surfaces of the clamping block, and the inclined plane inclines from the root of the first inclined angle groove towards the connecting block.

8. An implant coating shear strength testing device according to claim 1, characterized in that, The connecting block includes a platform base, a boss and a first single-ear plate. The boss and the platform base form the second inclined angle groove. The second inclined angle groove is composed of a horizontal plane and an inclined plane, wherein the horizontal plane is a surface of the platform base close to the clamping block, and the inclined plane inclines from the root of the second inclined angle groove towards the clamping block; the first single-ear plate is used for connecting the lower adapter tooling flange.

9. The implant coating shear strength testing device according to claim 8, characterized in that, The connecting block is provided with a threaded through hole and a countersunk threaded hole; the threaded through hole penetrates from the inner surface of the connecting block to the second inclined angle groove, and the clamping block is provided with a first threaded blind hole corresponding to the threaded through hole. The transverse screw is threadedly connected to the threaded through hole and the first threaded blind hole, and the axis of the transverse screw is perpendicular to the inner surface of the clamping block; the countersunk threaded hole penetrates from the bottom surface to the top surface of the platform base, and the clamping block is provided with a second threaded blind hole corresponding to the countersunk threaded hole. The longitudinal screw is threadedly connected to the countersunk threaded hole and the second threaded blind hole, and the axis of the longitudinal screw is perpendicular to the upper and lower surfaces of the clamping block.

10. The implant coating shear strength testing device according to claim 1, characterized in that, Both the upper adapter tooling flange and the lower adapter tooling flange are composed of a connecting shaft and a connecting flange; the connecting shaft includes a first U-shaped joint and a second U-shaped joint. The first U-shaped joint is connected to the connecting block by a cylindrical pin, and the second U-shaped joint is connected to the connecting flange by a cylindrical pin; the connecting flange includes a flange plate and a second single-ear plate; the flange plate is connected to an actuator or a sensor of the testing machine, and the second single-ear plate is connected to the second U-shaped joint by a cylindrical pin.

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