Universal multifunctional clamp for power module

Abstract

The utility model discloses a universal multifunctional clamp for a power supply module, which comprises a base, a shell clamping device and a pin positioning device, the pin positioning device comprises a contact element, an X-direction contact element clamping rod and a Y-direction contact element clamping rod, the upper end of the vertical contact element is provided with a jack, and the upper end of the Y-direction contact element clamping rod is provided with a jack. The four contact pieces are installed on the base through the X-direction contact piece clamping rod and the Y-direction contact piece clamping rod respectively, and the transverse distance between every two adjacent contact pieces can be changed and fixed. The shell clamping device comprises a shell clamping support, two first X-direction shell clamping rods capable of moving and being fixed in the X direction, two first Y-direction shell clamping rods capable of moving and being fixed in the Y direction, a compression bolt and a pressing plate, the pressing plate is connected with the lower end of the compression bolt, and the compression bolt is installed on the shell clamping support and can vertically move and be fixed. According to the utility model, various assembly processes and various test requirements of power supply modules with different sizes can be met, the production cost is reduced, and the use, storage and management are convenient.

Description

Technical Field

[0001] This utility model relates to a fixture for assembling and testing power modules, and more particularly to a universal multi-functional fixture for power modules. Background Technology

[0002] The casing of a power module is generally rectangular, with four pins on one side: positive and negative power input terminals and output terminals. Different fixtures are required during the assembly process, depending on the specific steps. For example, dedicated casing and pin fixing fixtures are needed for assembly and welding. Before leaving the factory, power modules undergo various tests, such as vibration, power-on, and shielding performance tests, each requiring different fixtures before testing.

[0003] Traditional fixtures used for power module assembly and testing are generally single-function, with different functions requiring separate fixtures. Therefore, different fixtures are needed for different assembly processes and test items for the same model and size of power modules. Different sizes of fixtures are also needed for different models and sizes of power modules, resulting in a large number of fixtures required, increasing the production cost for enterprises, and causing inconvenience in use and making storage and management difficult. Utility Model Content

[0004] The purpose of this utility model is to provide a universal multi-functional fixture for power modules that can meet the various assembly processes and testing requirements of power modules of different sizes in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A universal multi-functional clamp for power modules includes a base, a housing clamping device, and a pin positioning device. The top of the base is flat, and the bottom of the base has a base cavity with an opening at the bottom. The upper wall of the base cavity has a vertical base through hole, with two mutually perpendicular horizontal directions, namely the X and Y directions. The pin positioning device includes a contact, an X-direction contact clamping rod in the X direction, and a Y-direction contact clamping rod in the Y direction. The upper end of the vertical contact has a insertion hole. Four contacts are respectively installed on the base at positions corresponding to the base through holes via the X-direction contact clamping rod and the Y-direction contact clamping rod. The four contacts are distributed at the four corners of a horizontal rectangle, and the horizontal distance between two adjacent contacts can be varied and fixed. The upper ends of the four contacts are flush with the top of the base. The housing clamping device includes a housing clamping bracket and a first X-direction housing clamp in the X direction. The system includes a holding rod, a first Y-direction housing clamping rod with a length direction of Y, a clamping bolt, and a pressure plate. The housing clamping bracket is mounted on the base and located above the four contact members. The two ends of the two first X-direction housing clamping rods located on the same transverse plane are respectively connected to the housing clamping bracket by screws and strip-shaped through holes with a length direction of Y on the housing clamping bracket. The first X-direction housing clamping rods can move and be fixed in the Y direction. The two ends of the two first Y-direction housing clamping rods located on the same transverse plane are respectively connected to the housing clamping bracket by screws and strip-shaped through holes with a length direction of X on the housing clamping bracket. The first Y-direction housing clamping rods can move and be fixed in the X direction. The transverse pressure plate is connected to the lower end of the vertical clamping bolt and is located above the first X-direction housing clamping rods and the first Y-direction housing clamping rods. The clamping bolt is mounted on the housing clamping bracket and can move and be fixed vertically. The specific structure of the connection between the screw and the housing clamping bracket is not described in detail. It simply involves using a conventional screw to pass through the slotted hole and connect to the corresponding clamping rod, or the clamping rod passing through the corresponding slotted hole and being locked with a screw. The clamping rod can be released and locked by loosening and tightening the screw, thus realizing the movement and fixing functions of the clamping rod. The following related structures, including the structure of the corresponding clamping rod connecting to the slotted hole on the base, are based on the same principle.

[0007] Preferably, to better achieve the function of having four contacts distributed at the four corners of a horizontal rectangle, with the lateral distance between adjacent contacts being variable and fixed, the two ends of the X-direction contact clamping rod are respectively connected to the base via screws and strip-shaped through holes in the Y-direction. The X-direction contact clamping rod can move and be fixed in the Y-direction. The X-direction contact clamping rod has X-direction contact clamping rod strip-shaped through holes in the X-direction. The two ends of the Y-direction contact clamping rod are respectively connected to the base via screws and strip-shaped through holes in the X-direction. The Y-direction contact clamping rod can move and be fixed in the X-direction. The Y-direction contact clamping rod has Y-direction contact clamping rod strip-shaped through holes in the Y-direction. The base has X-direction base strip-shaped through holes in the X-direction and Y-direction base strip-shaped through holes in the Y-direction, respectively, near the base through holes. The outer wall of the middle part of the component is provided with a contact ring protruding outward in the circumferential direction. The first of the four contact elements is fixedly installed on the base near a corner of the base through hole. The second of the four contact elements passes through both the X-direction base strip through hole and the Y-direction contact element clamping rod strip through hole, and the contact ring on the contact element is located between the Y-direction contact element clamping rod and the upper cavity wall of the base cavity. The third of the four contact elements passes through both the Y-direction base strip through hole and the X-direction contact element clamping rod strip through hole, and the contact ring on the contact element is located between the X-direction contact element clamping rod and the upper cavity wall of the base cavity. The fourth of the four contact elements passes through both the X-direction contact element clamping rod strip through hole and the Y-direction contact element clamping rod strip through hole, and the contact ring on the contact element is located between the X-direction contact element clamping rod and the Y-direction contact element clamping rod.

[0008] Preferably, to better achieve the function of mounting the clamping bolt on the housing clamping bracket and enabling vertical movement and fixation, the housing clamping device further includes a second X-direction housing clamping rod in the X-direction, a second Y-direction housing clamping rod in the Y-direction, and a clamping screw sleeve. The two ends of the second X-direction housing clamping rod are respectively connected to the housing clamping bracket via screws and a strip-shaped through hole in the Y-direction. The second X-direction housing clamping rod can move and be fixed in the Y-direction. The second X-direction housing clamping rod has an X-direction housing clamping rod strip-shaped through hole in the X-direction. Similarly, the two ends of the second Y-direction housing clamping rod are respectively connected to the housing clamping bracket via screws and a strip-shaped through hole in the X-direction. The second Y-direction housing clamping rod can move and be fixed in the X-direction. The second Y-direction housing clamping rod has a Y-direction housing clamping rod strip-shaped through hole in the Y-direction. The second X-axis housing clamping rod and the second Y-axis housing clamping rod are located above the pressure plate. The vertical and tubular clamping screw sleeve has an internal thread and is connected to the external thread on the screw of the clamping bolt through the internal thread. The radial cross-section of the outer wall of the clamping screw sleeve is rectangular. The upper center of the pressure plate has an upwardly protruding pressure plate protrusion with a vertical blind hole. The lower end of the screw of the clamping bolt is connected to the blind hole of the pressure plate protrusion. The clamping screw sleeve is fitted onto the pressure plate. Outside the middle section of the screw of the clamping bolt, the middle part of the clamping sleeve is provided with a sleeve protrusion protruding in the outward circumferential direction. The clamping sleeve passes through both the X-direction outer shell clamping rod strip-shaped through hole and the Y-direction outer shell clamping rod strip-shaped through hole, and the sleeve protrusion is located between the second X-direction outer shell clamping rod and the second Y-direction outer shell clamping rod. The nut of the clamping bolt is located at the upper end of the clamping bolt and above the second X-direction outer shell clamping rod and the second Y-direction outer shell clamping rod.

[0009] The beneficial effects of this utility model are as follows:

[0010] This invention, through the design of a mutually cooperating base, housing clamping device, and pin positioning device, can position and clamp the housings of power modules of different sizes using the housing clamping device. The clamping directions include the horizontal X and Y directions, as well as the vertical upper and lower ends, thus achieving a highly reliable positioning and clamping function for the power module housing. Simultaneously, it can position and align the four pins of the power module with the sockets of the four contact members. Furthermore, three of the four contact members can be moved and fixed, thereby meeting the positioning and alignment requirements of the four pins for power modules of different sizes. This allows for the positioning of the housing and four pins according to the different assembly processes of the power module, thus completing the relevant assembly processes. During testing, simply connecting the lower ends of the four contact members to the power supply achieves reliable clamping and power supply functions for the power module, enabling the testing of relevant parameters or performance. This invention can meet various assembly processes and testing requirements for power modules of different sizes. One set of fixtures can satisfy all or most assembly processes and testing requirements, reducing production costs for enterprises and facilitating use, storage, and management. Attached Figure Description

[0011] Figure 1 This is a top perspective view of the universal multi-functional clamp for power modules described in this utility model;

[0012] Figure 2 This is a top perspective view of the base and pin positioning device of the universal multi-functional clamp for power modules described in this utility model;

[0013] Figure 3 This is a top perspective view of the housing clamping device of the universal multi-functional clamp for power modules described in this utility model;

[0014] Figure 4 This is a bottom perspective view of the base and pin positioning device of the universal multi-functional clamp for power modules described in this utility model;

[0015] Figure 5 This is a top-view perspective view of the clamping bolts, clamping sleeves, and pressure plate of the universal multi-functional clamp for power modules described in this utility model before assembly;

[0016] Figure 6 This is a top perspective view of the clamping bolts, clamping sleeves and pressure plate of the universal multi-functional clamp for power modules described in this utility model after assembly;

[0017] Figure 7 This is a top perspective view of the contact element of the universal multi-functional clamp for power modules described in this utility model;

[0018] Figure 8 This is one of the top-view perspective views of the universal multi-functional fixture for the power module described in this utility model.

[0019] Figure 9 This is the second top-view perspective view of the universal multi-functional fixture for the power module described in this utility model.

[0020] Figure 10 This is the third top-view perspective view of the universal multi-functional fixture for the power module described in this utility model. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] like Figures 1-7 As shown, the universal multi-functional fixture for power modules of this utility model includes a base 1, a housing clamping device, and a pin positioning device. The upper surface of the base 1 is flat, and the lower surface of the base 1 has a base cavity 19 with an opening at the lower end. The upper cavity wall of the base cavity 19 has a vertical base through hole 13, with two mutually perpendicular horizontal directions, namely the X direction and the Y direction. The pin positioning device includes a contact element 11, an X-direction contact element clamping rod 17 with a length direction of X, and a Y-direction contact element clamping rod 14 with a length direction of Y. The upper end of the contact 11 is provided with a socket. The four contact 11s are respectively installed on the base 1 at positions corresponding to the through holes 13 of the base via X-direction contact clamping rods 17 and Y-direction contact clamping rods 14. The four contact 11s are distributed at the four corners of the horizontal rectangle, and the horizontal distance between two adjacent contact 11s can be varied and fixed. The upper ends of the four contact 11s are flush with the top of the base 1. The shell clamping device includes a shell clamping bracket 2, a first X-direction shell clamping rod 3 with a length direction of X, and a length direction of X. The first Y-direction housing clamping rod 6, clamping bolt 7, and pressure plate 8 are mounted on the base 1 via screws (not marked in the figure) and are located above the four contact parts 11. The two ends of the two first X-direction housing clamping rods 3 located on the same transverse plane are connected to the housing clamping bracket 2 via screws (not marked in the figure) and strip-shaped through holes (not marked in the figure) on the housing clamping bracket 2 with a length direction of Y. The first X-direction housing clamping rods 3 can move and be fixed in the Y direction. The two ends of the two first Y-direction housing clamping rods 6 on the transverse plane are connected to the housing clamping bracket 2 via screws (not marked in the figure) and strip-shaped through holes (not marked in the figure) on the housing clamping bracket 2 in the X-direction. The first Y-direction housing clamping rods 6 can move and be fixed in the X-direction. The transverse pressure plate 8 is connected to the lower end of the vertical clamping bolt 7 and is located above the first X-direction housing clamping rods 3 and the first Y-direction housing clamping rods 6. The clamping bolt 7 is installed on the housing clamping bracket 2 and can move and be fixed vertically. In the above structure, for ease of observation and use, the housing clamping bracket 2 is a frame structure, that is, except for the positions where solid rods are needed for connection and through holes, other positions are hollow.

[0023] like Figures 1-7As shown, this utility model also discloses the following more optimized specific structures:

[0024] To better realize the function of having four contacts 11 distributed at the four corners of a horizontal rectangle, and the ability to change and fix the lateral distance between adjacent contacts 11, the two ends of the X-direction contact clamping rod 17 are connected to the base 1 via screws (not marked in the figure) and strip-shaped through holes (not marked in the figure) in the Y-direction on the base 1. The X-direction contact clamping rod 17 can move and be fixed in the Y-direction, and the X-direction contact clamping rod 17 is provided with X-direction contact clamping rod strip-shaped through holes 18 in the X-direction. The two ends of the Y-axis contact clamping rod 14 are connected to the base 1 via screws (not marked in the figure) and strip-shaped through holes (not marked in the figure) on the base 1 with the length direction in the X direction. The Y-axis contact clamping rod 14 can move and be fixed in the X direction. The Y-axis contact clamping rod 14 is provided with a Y-axis contact clamping rod strip-shaped through hole 15 with the length direction in the Y direction. The base 1 is provided with an X-axis base strip-shaped through hole 12 with the length direction in the X direction and a Y-axis base strip-shaped through hole 13 with the length direction in the Y direction. Hole 16, the outer wall of the middle part of the contact member 11 is provided with a contact member protrusion ring 23 protruding outward in the circumferential direction. The first contact member 11 of the four contact members 11 is fixedly installed on the base 1 near a corner of the base through hole 13. The second contact member 11 of the four contact members 11 passes through both the X-direction base strip through hole 12 and the Y-direction contact member clamping rod strip through hole 15, and the contact member protrusion ring 23 on the contact member 11 is located between the Y-direction contact member clamping rod 14 and the upper cavity wall of the base inner cavity 19. The third contact member 11 of the four contact members 11... Three contact elements 11 pass through the Y-direction base strip through hole 16 and the X-direction contact element clamping rod strip through hole 18 simultaneously, and the contact element protrusion 23 on the contact element 11 is located between the X-direction contact element clamping rod 17 and the upper cavity wall of the base cavity 19. The fourth contact element 11 of the four contact elements 11 passes through the X-direction contact element clamping rod strip through hole 18 and the Y-direction contact element clamping rod strip through hole 15 simultaneously, and the contact element protrusion 23 on the contact element 11 is located between the X-direction contact element clamping rod 17 and the Y-direction contact element clamping rod 14.

[0025] To better achieve the function of mounting the clamping bolt 7 on the housing clamping bracket 2 and enabling it to move and be fixed vertically, the housing clamping device further includes a second X-direction housing clamping rod 4 in the X-direction, a second Y-direction housing clamping rod 9 in the Y-direction, and a clamping screw sleeve 20. The two ends of the second X-direction housing clamping rod 4 are connected to the housing clamping bracket 2 via screws (not marked in the figure) and a strip-shaped through hole (not marked in the figure) in the Y-direction of the housing clamping bracket 2. Rod 4 can move and be fixed in the Y direction. The second X-direction housing clamping rod 4 is provided with an X-direction housing clamping rod strip-shaped through hole 5 in the X direction. The two ends of the second Y-direction housing clamping rod 9 are respectively connected to the housing clamping bracket 2 by screws (not marked in the figure) and strip-shaped through holes (not marked in the figure) in the X direction. The second Y-direction housing clamping rod 9 can move and be fixed in the X direction. The second Y-direction housing clamping rod 9 is provided with a Y-direction housing clamping rod strip-shaped through hole 1 in the Y direction. 0. The second X-direction housing clamping rod 4 and the second Y-direction housing clamping rod 9 are located above the pressure plate 8. The vertical and tubular clamping screw sleeve 20 has an internal thread and is connected to the external thread on the screw of the clamping bolt 7 through the internal thread. The radial cross section of the outer wall of the clamping screw sleeve 20 is rectangular (to prevent the clamping screw sleeve 20 from rotating when the clamping bolt 7 rotates). The upper center of the pressure plate 8 has an upwardly protruding pressure plate protrusion 22 with a vertical blind hole. The lower end of the screw of the clamping bolt 7 is connected to the pressure plate protrusion 22. The blind hole connection of 2 is provided. The clamping screw 20 is fitted outside the middle section of the screw of the clamping bolt 7. The middle part of the clamping screw 20 is provided with a screw convex ring 21 that protrudes outward in the circumferential direction. The clamping screw 20 passes through the X-direction outer shell clamping rod strip through hole 5 and the Y-direction outer shell clamping rod strip through hole 10 at the same time. The screw convex ring 21 is located between the second X-direction outer shell clamping rod 4 and the second Y-direction outer shell clamping rod 9. The nut of the clamping bolt 7 is located at the upper end of the clamping screw 7 and above the second X-direction outer shell clamping rod 4 and the second Y-direction outer shell clamping rod 9.

[0026] like Figures 1-10 As shown, during application, first remove the housing clamping device, and adjust the approximate position of the four contacts 11 according to the size of the power module to be tested, without locking the three movable contacts 11. Then, move the four pins 25 of the power module 24 downwards to above the four contacts 11 and align them with the insertion holes of the contacts 11, as shown. Figure 8As shown, during the insertion process, firstly, one pin 25 is aligned with the socket of the immovable contact 11 and inserted slightly. Then, the positions of the other contacts 11 are finely adjusted (by moving the X-direction contact clamping rod 17 and / or the Y-direction contact clamping rod 14) to align them with the other three pins 25. Then, the four pins 25 are inserted into the sockets of the four contacts 11 until the lower end of the power module 24 contacts the upper part of the base 1. Next, the X-direction contact clamping rod 17 and the Y-direction contact clamping rod 14 are moved and locked in place, thus completing the initial installation of the power module 24 and the connection of the four pins 25. Then, according to the size of the power module 24, the two first X-direction housing clamping rods are adjusted (by moving the two first X-direction housing clamping rods to change their spacing), and the two first Y-direction housing clamping rods are adjusted... Adjust the positions of the housing clamping rods (adjusted by moving the two first Y-axis housing clamping rods to change their spacing) and the pressure plate 8 (adjusted by: first, rotating the clamping bolt 7, which moves vertically due to the clamping sleeve 20 not rotating, thus causing the pressure plate 8 to rise and fall vertically; second, moving the second X-axis housing clamping rod 4 and / or the second Y-axis housing clamping rod 9, thus causing the pressure plate 8 to move laterally) so that the power module installation space formed by the two first X-axis housing clamping rods, the two first Y-axis housing clamping rods, the pressure plate 8, and the top of the base 1 is larger than the size of the power module. Then, place the housing clamping bracket 2 of the housing clamping device on the base 1, and position the power module within the power module installation space. Finally, fix the housing clamping bracket 2 on the base 1 with screws. Figure 9 and Figure 10 As shown; then fine-tune the positions of the two first X-direction housing clamping rods, the two first Y-direction housing clamping rods, and the pressure plate 8, so that the two first X-direction housing clamping rods are in close contact with the opposite outer walls of the housing of the power module 24 and then locked with corresponding screws, so that the two first Y-direction housing clamping rods are in close contact with the other opposite outer walls of the housing of the power module 24 and then locked with corresponding screws, so that the bottom of the pressure plate 8 is in close contact with the upper middle part of the housing of the power module 24 and then locked with corresponding screws, as shown. Figure 10 As shown, this achieves omnidirectional and highly reliable positioning and clamping of the power module; then, the lower ends of the four contact pieces 11 are connected to the power cord (usually by soldering), and various related tests can be performed. During the assembly of the power module 24, the usage process of this utility model can be adapted to the above process, and will not be repeated here.

[0027] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A universal multi-functional clamp for power modules, comprising a base, characterized in that: It also includes a housing clamping device and a pin positioning device. The top of the base is flat, and the bottom of the base has a base cavity with an opening at the bottom. The upper cavity wall of the base cavity has a vertical base through hole, with two mutually perpendicular horizontal directions, namely the X and Y directions. The pin positioning device includes a contact element, an X-direction contact element clamping rod in the X direction, and a Y-direction contact element clamping rod in the Y direction. The upper end of the vertical contact element has an insertion hole. The four contacts are respectively installed on the base at positions corresponding to the base through holes through the X-direction contact element clamping rod and the Y-direction contact element clamping rod. The four contacts are distributed at the four corners of the horizontal rectangle, and the horizontal distance between two adjacent contacts can be varied and fixed. The upper ends of the four contacts are flush with the top of the base. The housing clamping device includes a housing clamping bracket, a first X-direction housing clamping rod in the X direction, and a Y-direction housing clamping rod in the Y direction. The first Y-axis housing clamping rod, the clamping bolt, and the pressure plate are provided. The housing clamping bracket is installed on the base and above the four contact members. The two ends of the two first X-axis housing clamping rods located on the same horizontal plane are respectively connected to the housing clamping bracket by screws and strip-shaped through holes in the Y-direction of the housing clamping bracket. The first X-axis housing clamping rods can move and be fixed in the Y direction. The two ends of the two first Y-axis housing clamping rods located on the same horizontal plane are respectively connected to the housing clamping bracket by screws and strip-shaped through holes in the X-direction of the housing clamping bracket. The first Y-axis housing clamping rods can move and be fixed in the X direction. The horizontal pressure plate is connected to the lower end of the vertical clamping bolt and is located above the first X-axis housing clamping rods and the first Y-axis housing clamping rods. The clamping bolt is installed on the housing clamping bracket and can move and be fixed vertically.

2. The universal multi-functional fixture for power modules according to claim 1, characterized in that: Both ends of the X-direction contact clamping rod are connected to the base via screws and strip-shaped through holes in the Y-direction. The X-direction contact clamping rod can move and be fixed in the Y-direction. The X-direction contact clamping rod has strip-shaped through holes in the X-direction. Both ends of the Y-direction contact clamping rod are connected to the base via screws and strip-shaped through holes in the X-direction. The Y-direction contact clamping rod can move and be fixed in the X-direction. The Y-direction contact clamping rod has strip-shaped through holes in the Y-direction. The base has X-direction and Y-direction base strip-shaped through holes near the base through holes. The outer wall of the middle part of the contact has a contact protrusion ring protruding outwards. The four contact... The first contact of the four components is fixedly installed on the base near a corner of the base through hole. The second contact of the four components passes through both the X-direction base through hole and the Y-direction contact clamping rod through hole, and the contact protrusion on the contact is located between the Y-direction contact clamping rod and the upper cavity wall of the base cavity. The third contact of the four components passes through both the Y-direction base through hole and the X-direction contact clamping rod through hole, and the contact protrusion on the contact is located between the X-direction contact clamping rod and the upper cavity wall of the base cavity. The fourth contact of the four components passes through both the X-direction contact clamping rod through hole and the Y-direction contact clamping rod through hole, and the contact protrusion on the contact is located between the X-direction contact clamping rod and the Y-direction contact clamping rod.

3. The universal multi-functional fixture for power modules according to claim 1 or 2, characterized in that: The outer casing clamping device further includes a second X-direction outer casing clamping rod in the X-direction, a second Y-direction outer casing clamping rod in the Y-direction, and a clamping screw sleeve. The two ends of the second X-direction outer casing clamping rod are respectively connected to the outer casing clamping bracket via screws and a strip-shaped through hole in the Y-direction. The second X-direction outer casing clamping rod is movable and fixed in the Y-direction. The second X-direction outer casing clamping rod has an X-direction outer casing clamping rod strip-shaped through hole in the X-direction. The two ends of the second Y-direction outer casing clamping rod are respectively connected to the outer casing clamping bracket via screws and a strip-shaped through hole in the X-direction. The second Y-direction outer casing clamping rod is movable and fixed in the X-direction. The second Y-direction outer casing clamping rod has a Y-direction outer casing clamping rod strip-shaped through hole in the Y-direction. The second X-direction outer casing clamping rod and the second Y-direction outer casing clamping rod... The holding rod is located above the pressure plate. The vertical and tubular clamping screw sleeve has an internal thread and is connected to the external thread on the screw of the clamping bolt through the internal thread. The radial cross-section of the outer wall of the clamping screw sleeve is rectangular. The upper center of the pressure plate has an upwardly protruding pressure plate protrusion with a vertical blind hole. The lower end of the screw of the clamping bolt is connected to the blind hole of the pressure plate protrusion. The clamping screw sleeve is fitted outside the middle section of the screw of the clamping bolt. The middle part of the clamping screw sleeve has a screw sleeve protrusion ring protruding outward in the circumferential direction. The clamping screw sleeve passes through both the X-direction outer shell clamping rod strip-shaped through hole and the Y-direction outer shell clamping rod strip-shaped through hole. The screw sleeve protrusion ring is located between the second X-direction outer shell clamping rod and the second Y-direction outer shell clamping rod. The nut of the clamping bolt is located at the upper end of the clamping bolt and above the second X-direction outer shell clamping rod and the second Y-direction outer shell clamping rod.

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