Multi-directional static fatigue test tooling for a housing

Abstract

The utility model provides a multi -direction static fatigue test frock of machine case, it can be fastly adapted to carry out static fatigue test to a variety of state after machine case part assembly, and will not wear machine case part when state switches. The machine case part that it is suitable for includes outer peripheral flange, inner sleeve, and the outer end surface ring of inner sleeve is clothed with a plurality of positioning holes, has characteristics in, it includes: briquetting, it is used to press the outer end surface of inner sleeve and with the centring arrangement of inner sleeve, the centre of briquetting is provided with screw hole, fastening pressure plate, it is ring board, it will briquetting be fixed with the positioning hole of ring clothed outer end surface of inner sleeve through fastener, adapter frock, it is used for fixed connection machine case part, and make the outer end surface of inner sleeve of machine case part expose, side plate frock, it includes a oblique installation surface, bottom support surface, the oblique installation surface and bottom support surface are according to the acute angle formed, form oblique stress surface, frock bottom plate and three groups of pressure rod.

Description

Technical Field

[0001] This utility model relates to the technical field of casing fatigue testing, specifically to a multi-directional static fatigue testing fixture for casings. Background Technology

[0002] With the development of aero-engine technology, more and more new engines are demanding lightweight design. Besides structural design, lightweight design can also be considered from a materials perspective. A novel design scheme utilizing a hybrid of metal and thermoplastic composite materials to manufacture the engine casing simplifies the structure and reduces weight of aero-engine components, effectively improving overall engine performance. The metal frame ensures strength and thermal conductivity, while the composite materials reduce structural weight while maintaining strength.

[0003] However, composite materials exhibit some differences in plasticity and fatigue performance compared to metals. Therefore, after the design and prototype manufacturing of a casing made of composite materials, static and fatigue tests are required to verify the structural reliability. For the casing's operating conditions, the static test is divided into three conditions: axial force, radial force, and resultant force.

[0004] Current static fatigue testing fixtures for parts are mostly unidirectional, requiring disassembly and adjustment for direction changes. This repeated disassembly and reassembly process is complex, and the mating areas of the parts are prone to wear, making it impossible to accurately reflect the service condition. Therefore, there is an urgent need to develop a universal multidirectional static fatigue testing fixture that can adapt to various conditions for testing, thereby making it quick and convenient to switch between different side-view conditions. Utility Model Content

[0005] To address the aforementioned issues, this utility model provides a multi-directional static fatigue testing fixture for the casing. After the casing parts are assembled, it can quickly adapt to various states for static fatigue testing, and will not wear down the casing parts when switching states, ensuring that the static test is carried out efficiently and stably.

[0006] The multi-directional static fatigue testing fixture for the casing is applicable to casing parts including an outer flange and an inner sleeve, with several positioning holes arranged around the outer end face of the inner sleeve. Its distinguishing feature is that it includes:

[0007] A pressure block is used to press against the outer end face of the inner sleeve and is centered with the inner sleeve. A threaded hole is provided in the center of the pressure block.

[0008] The fastening plate is a ring plate, which fixes the pressure block to the positioning hole of the ring cloth on the outer end face of the inner sleeve through fasteners;

[0009] The adapter is used to fix the casing parts and expose the outer end face of the inner sleeve of the casing parts.

[0010] The side panel fixture includes an inclined mounting surface and a bottom support surface, wherein the inclined mounting surface and the bottom support surface are formed at acute angles according to the design to form inclined force-bearing surfaces;

[0011] Tooling base plate;

[0012] And three sets of compression members, namely vertical compression members, diagonal compression members, and C-shaped compression members;

[0013] The casing parts are pre-positioned and assembled from the non-load-bearing surface of the adapter tool, so that the outer end face of the inner sleeve of the casing parts is exposed and becomes the load-bearing surface. The pressure block covers the outer end face of the inner sleeve of the casing parts and is fixed by the fastening pressure plate and fasteners. The threaded hole at the center of the pressure block is used to fix the connecting end of the corresponding pressure rod. The casing parts, adapter tool, pressure block and fastening pressure plate are assembled to form the overall structure to be tested.

[0014] Its further features are:

[0015] The vertical pressure bar is a column structure, including an upper pressure bar end and a lower protruding threaded connection end. The vertical pressure bar, the overall structure to be tested, and the tooling base plate are combined for axial static pressure testing. The overall structure to be tested is arranged horizontally, with the pressure block located on the upper layer. The lower threaded connection end of the vertical pressure bar is fixed to the threaded hole of the pressure block. The adapter tool is fixed to the corresponding position on the upper surface of the tooling base plate through a vertical stud. The upper pressure bar end of the vertical pressure bar is subjected to force for axial static pressure testing.

[0016] The inclined pressure bar is a columnar structure, including an upper force-bearing end and a lower force-transmitting end. The bottom of the lower force-transmitting end includes an acute-angled inclined surface, and a through-hole is provided on the acute-angled inclined surface. The through-hole is arranged perpendicular to the acute-angled inclined surface. The inclined pressure bar, the overall structure under test, the side plate fixture, and the fixture base plate are combined for performing a static pressure test under inclined force. The bottom surface of the adapter fixture of the overall structure under test is fixedly installed close to the inclined mounting surface. The bottom support surface of the side plate fixture is fixedly installed close to the upper surface of the fixture base plate. The acute-angled inclined surface is close to the pressure block, and the through-hole and the threaded hole are arranged coaxially. The fastening bolt is threaded into the threaded hole after passing through the through-hole. The upper force-bearing end of the inclined pressure bar is subjected to force for an inclined static force test.

[0017] Preferably, the angle of the acute-angled inclined plane is 45°, which is used for static force testing;

[0018] The C-shaped pressure bar includes a horizontal short bar, a vertical bar, and a horizontal long bar. The horizontal long bar and the horizontal short bar are connected by the vertical bar. The horizontal long bar is used for structural pressure. The horizontal short bar has a through guide hole along its length. The C-shaped pressure bar, the overall structure to be tested, and the tooling base plate are combined for radial static pressure testing. The overall structure to be tested is arranged vertically. The threaded hole of the pressure block is set horizontally. One side of the adapter is fixed to the upper surface of the tooling base plate. The horizontal short bar is set below the vertical bar. The through guide hole and the threaded hole of the horizontal short bar are coaxially connected. The fastening bolt is threaded to the threaded hole after passing through the through guide hole. The equivalent vertical plane formed by the horizontal long bar, the vertical bar, and the horizontal short bar is arranged perpendicular to the upper surface of the tooling base plate.

[0019] Preferably, the length of the vertical rod is greater than the distance from the threaded hole to one side of the overall structure to be tested, and the horizontal rod is arranged above the upper side of the adapter in the vertical state.

[0020] The adapter tooling includes positioning holes at the four corners in a horizontal state, and auxiliary positioning holes spaced apart at both ends of the auxiliary side in a vertical state.

[0021] The tooling base plate includes two sets of through positioning holes arranged on one pair of sides. Each set of positioning holes includes an end positioning hole and two adjacent center positioning holes on both sides. The distance between two adjacent center positioning holes is equal to the distance between the auxiliary positioning holes at the same end of the auxiliary positioning side in the vertical state of the transition tooling.

[0022] The oblique mounting surface of the side plate fixture is provided with alignment positioning holes corresponding to the positioning holes at the four corners, and the bottom support surface is provided with alignment positioning holes corresponding to the positioning holes of the positioning hole group on the fixture base plate.

[0023] The adapter tooling includes a housing part positioning cavity that is concave from the inside out. The center of the housing part positioning cavity is a central through hole, and positioning holes are arranged around the outer circumference. The outer circumference flange of the housing part fits into the outer circumference of the housing part positioning cavity from the inside out and is fixed to the corresponding positioning holes by screws from the inside out. The outer end face of the inner sleeve of the housing part is set outward.

[0024] A test method for static testing using a multi-directional static fatigue testing fixture is characterized in that the casing parts, adapter fixture, pressure block, and fastening pressure plate are assembled in advance to form the overall structure to be tested. Then, by switching the attitude of the overall structure to be tested relative to the fixture base plate and replacing the corresponding pressure bar, the static test under the corresponding stress state can be performed.

[0025] Its further features are:

[0026] During axial static testing, the overall structure under test is arranged horizontally relative to the tooling base plate, and the pressure of the press is transmitted vertically to the pressure plate through the vertical pressure bar;

[0027] During radial static testing, the overall structure under test is arranged vertically relative to the tooling base plate, and the pressure of the press is radially transmitted to the pressure plate through the C-shaped pressure bar.

[0028] During the static test, the overall structure under test is obliquely fixed to the oblique mounting surface of the side plate fixture, and the bottom support surface of the side plate fixture is fixed to the upper surface of the fixture base plate. The pressure of the press is transmitted to the pressure plate through the oblique pressure bar.

[0029] With the structure of this utility model, during use, the casing parts are bolted from the inner cavity to the casing part positioning cavity of the adapter fixture. The pressure block is pressed into the inner sleeve of the casing parts and positioned. Then, the fastening pressure plate is installed. Finally, the appropriate pressure rod is installed according to the direction of the force, and the position of the overall structure to be tested is adjusted. The fixture has three usage modes, which are used for static testing under three working conditions: axial force, radial force, and resultant force. After the overall structure to be tested is assembled, when adjusting the force in different directions, there is no need to disassemble the casing parts. Only the attitude of the overall structure to be tested relative to the fixture base plate and the corresponding pressure rod need to be changed to perform static testing under the corresponding force state. After the casing parts are assembled, it can quickly adapt to multiple states for static fatigue testing, and the casing parts will not be worn when switching states, ensuring that the static test is carried out efficiently and stably. Attached Figure Description

[0030] Figure 1 The structural three-dimensional representation of the resultant force test of this utility model Figure 1 ;

[0031] Figure 2 The structural three-dimensional representation of the resultant force test of this utility model Figure 2 ;

[0032] Figure 3 This is the three-dimensional structure for axial force testing of this utility model. Figure 1 ;

[0033] Figure 4 This is the three-dimensional structure for axial force testing of this utility model. Figure 2 ;

[0034] Figure 5 This is the three-dimensional structure for radial force testing according to this utility model. Figure 1 ;

[0035] Figure 6 This is the three-dimensional structure for radial force testing according to this utility model. Figure 2 ;

[0036] Figure 7 This is the three-dimensional structure for radial force testing according to this utility model. Figure 3 ;

[0037] The names corresponding to the serial numbers in the diagram are as follows:

[0038] Pressure block 10, threaded hole 11, fastening pressure plate 20, adapter tooling 30, housing part positioning cavity 301, center through hole 302, four corner positioning holes 31, auxiliary positioning hole 32, side plate tooling 40, oblique mounting surface 41, bottom support surface 42, alignment positioning hole 43, tooling base plate 50, end positioning hole 51, center positioning hole 52, vertical pressure bar 60, upper pressure bar end 61, lower protruding threaded connection end 62, oblique pressure bar 70, upper force-bearing end 71, lower force-transmitting end 72, acute angled bevel 721, C-shaped pressure bar 80, horizontal short bar 81, vertical bar 82, horizontal long bar 83, overall structure to be tested 90, housing part 100, outer flange 101, inner sleeve 102. Detailed Implementation

[0039] For the multi-directional static fatigue testing fixture for the casing, the applicable casing parts 100 include an outer flange 101 and an inner sleeve 102, and the outer end face of the inner sleeve 102 is provided with several positioning holes, see... Figures 1-7 It includes a pressure block 10, a fastening pressure plate 20, a transition tooling 30, a side plate tooling 40, a tooling base plate 50, and three sets of pressure rods;

[0040] The pressure block 10 is used to press the outer end face of the inner sleeve 102 and is centered with the inner sleeve 102. The center of the pressure block 10 is provided with a threaded hole 11.

[0041] The fastening plate 20 is a ring plate, which fixes the pressure block 10 to the positioning hole of the ring cloth on the outer end face of the inner sleeve 102 through the fastener.

[0042] The adapter 30 is used to fix the housing part 100 and exposes the outer end face of the inner sleeve 102 of the housing part 100.

[0043] The side panel fixture 40 includes an inclined mounting surface 41 and a bottom support surface 42. The inclined mounting surface 41 and the bottom support surface 42 are acute angles formed according to the design, forming inclined force-bearing surfaces.

[0044] The three sets of compression members are vertical compression members 60, inclined compression members 70, and C-shaped compression members 80;

[0045] The casing part 100 is pre-positioned and assembled from the non-load-bearing surface of the adapter tool 30, so that the outer end face of the inner sleeve 102 of the casing part 100 is exposed and becomes the load-bearing surface. The pressure block 10 covers the outer end face of the inner sleeve 102 of the casing part 100 and is fixed by the fastening pressure plate 20 and fasteners. The threaded hole 11 at the center of the pressure block 10 is used to fix the connecting end of the corresponding pressure rod. The casing part 100, the adapter tool 30, the pressure block 10, and the fastening pressure plate 20 are assembled to form the overall structure 90 to be tested.

[0046] In specific implementation, the vertical pressure bar 60 is a column structure, which includes an upper pressure bar end 61 and a lower protruding threaded connection end 62. The vertical pressure bar 60, the overall structure to be tested 90, and the tooling base plate 50 are combined to conduct axial static pressure tests. The overall structure to be tested 90 is arranged horizontally, and the pressure block 10 is located on the upper layer. The lower threaded connection end 62 of the vertical pressure bar 60 is fixed to the threaded hole 11 of the pressure block 10. The adapter tooling 30 is fixed to the corresponding position on the upper surface of the tooling base plate 50 through vertical studs. The upper pressure bar end 61 of the vertical pressure bar 60 is subjected to force for axial static pressure testing.

[0047] The inclined pressure bar 70 is a columnar structure, comprising an upper force-bearing end 71 and a lower force-transmitting end 72. The bottom of the lower force-transmitting end 72 includes an acute-angled inclined surface 721, on which a through-hole is provided. The through-hole is arranged perpendicular to the acute-angled inclined surface 721. The inclined pressure bar 70, the overall structure under test 90, the side plate fixture 40, and the fixture base plate 50 are combined for conducting a static pressure test under inclined force. The bottom surface of the adapter fixture 30 of the overall structure under test 90 is in close contact with... The inclined mounting surface 41 is fixedly installed, and the bottom support surface 42 of the side plate fixture 40 is fixedly installed close to the upper surface of the fixture base plate 50. The acute angled surface 721 is close to the pressure block 10 and is arranged coaxially through the positioning hole and the threaded hole 11. The fastening bolt 1 is threadedly fixed to the threaded hole 11 after passing through the positioning hole. The upper force-bearing end 71 of the inclined pressure rod 70 is subjected to force for inclined static force test. In specific implementation, the angle of the acute angled surface 721 is 45°, which is used for resultant static force test.

[0048] The C-type pressure bar 80 includes a horizontal short bar 81, a vertical bar 82, and a horizontal long bar 83. The horizontal long bar 83 and the horizontal short bar 81 are connected by the vertical bar 82. The horizontal long bar 83 is used for structural pressure. The horizontal short bar 81 is provided with a through guide hole along its length. The C-type pressure bar 80, the overall structure to be tested 90, and the tooling base plate 50 are combined for radial static pressure testing. The overall structure to be tested 90 is arranged vertically. The threaded hole 11 of the pressure block 10 is set horizontally. One side of the adapter tooling 30 is fixed to the upper surface of the tooling base plate 50. The horizontal short bar 81 is located below the vertical bar 82. The through guide hole and the threaded hole 11 of the horizontal short bar 81 are coaxially connected. The fastening bolt 1 is threaded to the threaded hole 11 after passing through the through guide hole. The equivalent elevation formed by the horizontal long bar 83, the vertical bar 82, and the horizontal short bar 81 is arranged perpendicular to the upper surface of the tooling base plate 50.

[0049] In a specific embodiment, the length of the vertical rod 82 is greater than the distance from the threaded hole 11 of the overall structure 90 to one side, and the horizontal rod 83 is arranged above the upper side of the adapter 50 in the vertical state.

[0050] In specific implementation, the adapter 30 includes four corner positioning holes 31 in the horizontal state and auxiliary positioning holes 32 spaced apart at both ends of the auxiliary side in the vertical state.

[0051] The tooling base plate 50 includes two sets of through positioning holes arranged on one of its pairs of sides. Each set of positioning holes includes an end positioning hole 51 and two adjacent center position positioning holes 52. The distance between two adjacent center position positioning holes 52 is equal to the distance between the auxiliary positioning holes 32 at the same end of the auxiliary positioning side in the vertical state of the adapter tooling 30.

[0052] The oblique mounting surface 41 of the side plate fixture 40 is provided with positioning holes 43 corresponding to the positioning holes 31 at the four corners, and the bottom support surface 42 is provided with positioning holes corresponding to the positioning holes 52 of the positioning hole group of the fixture base plate 50.

[0053] The adapter tooling 30 includes a housing part positioning cavity 301 that is recessed from the inside out. The center of the housing part positioning cavity 301 is a central through hole 302, and positioning holes are arranged around the outer ring. The outer peripheral flange 101 of the housing part 100 fits against the outer ring of the housing part positioning cavity 301 from the inside out and is fixed to the corresponding positioning holes from the inside out by screws. The outer end face of the inner sleeve 102 of the housing part 100 is set outward.

[0054] A test method for static testing using a multi-directional static fatigue testing fixture: the casing part 100, the adapter fixture 30, the pressure block 10, and the fastening pressure plate 20 are assembled in advance to form the overall structure 90 to be tested. Then, by switching the posture of the overall structure 90 to be tested relative to the fixture base plate 50 and replacing the corresponding pressure bar, the static test under the corresponding stress state can be carried out.

[0055] In practice, during the axial static test, the overall structure 90 to be tested is arranged horizontally relative to the tooling base plate 50, and the pressure of the press is transmitted vertically to the pressure plate 10 through the vertical pressure bar 60.

[0056] During radial static testing, the overall structure under test 90 is arranged vertically relative to the tooling base plate 50, and the pressure of the press is radially transmitted to the pressure plate 10 through the C-shaped pressure bar 80.

[0057] During the static test, the overall structure under test 90 is obliquely fixed to the oblique mounting surface 41 of the side plate fixture 40, and the bottom support surface 42 of the side plate fixture 40 is fixed to the upper surface of the fixture base plate 50. The pressure of the press is transmitted to the pressure plate 10 through the oblique pressure rod 70.

[0058] Its working principle is as follows: During use, the casing parts are locked and fixed to the casing part positioning cavity of the adapter fixture by bolts from the inner cavity. The pressure block is pressed into the inner sleeve of the casing parts and positioned. Then, the fastening pressure plate is installed. Finally, the appropriate pressure bar is installed according to the direction of the force, and the position of the overall structure to be tested is adjusted. The fixture has three usage modes, which are used to conduct static tests under three working conditions: axial force, radial force, and resultant force. After the overall structure to be tested is assembled, when adjusting the force in different directions, there is no need to disassemble the casing parts. Only the attitude of the overall structure to be tested relative to the fixture base plate and the corresponding pressure bar need to be changed to conduct static tests under the corresponding force conditions. After the casing parts are assembled, it can quickly adapt to multiple states for static fatigue testing, and the casing parts will not be worn when switching states, ensuring that the static test is carried out efficiently and stably.

[0059] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-directional static fatigue testing fixture for a casing, the applicable casing parts include an outer flange and an inner sleeve, and the outer end face of the inner sleeve is provided with several positioning holes, characterized in that it includes: A pressure block is used to press against the outer end face of the inner sleeve and is centered with the inner sleeve. A threaded hole is provided in the center of the pressure block. The fastening plate is a ring plate, which fixes the pressure block to the positioning hole of the ring cloth on the outer end face of the inner sleeve through fasteners; The adapter is used to fix the casing parts and expose the outer end face of the inner sleeve of the casing parts. The side panel fixture includes an inclined mounting surface and a bottom support surface, wherein the inclined mounting surface and the bottom support surface are formed at acute angles according to the design to form inclined force-bearing surfaces; Tooling base plate; And three sets of compression members, namely vertical compression members, diagonal compression members, and C-shaped compression members; The casing parts are pre-positioned and assembled from the non-load-bearing surface of the adapter tool, so that the outer end face of the inner sleeve of the casing parts is exposed and becomes the load-bearing surface. The pressure block covers the outer end face of the inner sleeve of the casing parts and is fixed by the fastening pressure plate and fasteners. The threaded hole at the center of the pressure block is used to fix the connecting end of the corresponding pressure rod. The casing parts, adapter tool, pressure block and fastening pressure plate are assembled to form the overall structure to be tested.

2. The multi-directional static fatigue testing fixture for the casing according to claim 1, characterized in that: The vertical pressure bar is a column structure, including an upper pressure bar end and a lower protruding threaded connection end. The vertical pressure bar, the overall structure to be tested, and the tooling base plate are combined for axial static pressure testing. The overall structure to be tested is arranged horizontally, with the pressure block located on the upper layer. The lower threaded connection end of the vertical pressure bar is fixed to the threaded hole of the pressure block. The adapter tool is fixed to the corresponding position on the upper surface of the tooling base plate through a vertical stud. The upper pressure bar end of the vertical pressure bar is subjected to force for axial static pressure testing.

3. The multi-directional static fatigue testing fixture for the casing according to claim 1, characterized in that: The inclined pressure bar is a columnar structure, including an upper force-bearing end and a lower force-transmitting end. The bottom of the lower force-transmitting end includes an acute-angled inclined surface, and a through-hole is provided on the acute-angled inclined surface. The through-hole is arranged perpendicular to the acute-angled inclined surface. The inclined pressure bar, the overall structure under test, the side plate fixture, and the fixture base plate are combined for performing an inclined static pressure test. The bottom surface of the adapter fixture of the overall structure under test is fixedly mounted against the inclined mounting surface. The bottom support surface of the side plate fixture is fixedly mounted against the upper surface of the fixture base plate. The acute-angled inclined surface is close to the pressure block, and the through-hole and the threaded hole are arranged coaxially. The fastening bolt passes through the through-hole and is threaded into the threaded hole. The upper force-bearing end of the inclined pressure bar is subjected to force for an inclined static pressure test.

4. The multi-directional static fatigue testing fixture for the casing according to claim 1, characterized in that: The C-shaped pressure bar includes a horizontal short bar, a vertical bar, and a horizontal long bar. The horizontal long bar and the horizontal short bar are connected by the vertical bar. The horizontal long bar is used for structural pressure. The horizontal short bar has a through guide hole along its length. The C-shaped pressure bar, the overall structure to be tested, and the tooling base plate are combined for radial static pressure testing. The overall structure to be tested is arranged vertically, and the threaded hole of the pressure block is set horizontally. One side of the adapter tool is fixed to the upper surface of the tooling base plate. The horizontal short bar is set below the vertical bar. The through guide hole and the threaded hole of the horizontal short bar are coaxially connected. The fastening bolt is threaded to the threaded hole after passing through the through guide hole. The equivalent vertical plane formed by the horizontal long bar, the vertical bar, and the horizontal short bar is arranged perpendicular to the upper surface of the tooling base plate.

5. The multi-directional static fatigue testing fixture for the casing according to claim 1, characterized in that: The adapter tooling includes positioning holes at the four corners in a horizontal state, and auxiliary positioning holes spaced apart at both ends of the auxiliary side in a vertical state.

6. The multi-directional static fatigue testing fixture for the casing according to claim 5, characterized in that: The tooling base plate includes two sets of through positioning holes arranged on one pair of sides. Each set of positioning holes includes an end positioning hole and two adjacent center positioning holes on both sides. The distance between two adjacent center positioning holes is equal to the distance between the auxiliary positioning holes at the same end of the auxiliary positioning side in the vertical state of the transfer tooling.

7. The multi-directional static fatigue testing fixture for the casing according to claim 6, characterized in that: The oblique mounting surface of the side plate fixture is provided with alignment positioning holes corresponding to the positioning holes at the four corners, and the bottom support surface is provided with alignment positioning holes corresponding to the positioning holes of the positioning hole group on the fixture base plate.

8. The multi-directional static fatigue testing fixture for the casing according to claim 1, characterized in that: The adapter tooling includes a housing part positioning cavity that is concave from the inside out. The center of the housing part positioning cavity is a central through hole, and positioning holes are arranged around the outer circumference. The outer circumference flange of the housing part fits into the outer circumference of the housing part positioning cavity from the inside out and is fixed to the corresponding positioning holes by screws from the inside out. The outer end face of the inner sleeve of the housing part is set outward.

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