Coating type self-lubricating centripetal joint bearing space irradiation fixture and working method

Abstract

The application discloses a coating type self-lubricating radial spherical bearing space irradiation clamp and a working method, relates to the irradiation test technical field of a moving part for spaceflight, and comprises an adapter plate and a bearing clamping module. The bearing clamping module comprises a fixing piece, two supporting columns and a coating type self-lubricating radial spherical bearing. A second connecting through hole is formed in the front end of the fixing piece, and a stepped groove for accommodating and fixing a bearing outer ring is arranged at the rear end of the fixing piece. The width of the stepped groove is matched with the width of the bearing outer ring. First threaded holes are formed in the middle of the two sides of the stepped groove corresponding to the fixing piece, and the first threaded holes are matched with the supporting columns. The first threaded holes and the second connecting through hole are matched through fasteners to fix the supporting columns. The coating type self-lubricating radial spherical bearing space irradiation clamp and the working method are used to realize the irradiation test requirements of different sizes of coating type self-lubricating radial spherical bearings and realize the open and closed irradiation tests.

Description

Technical Field

[0001] This invention relates to the field of irradiation testing technology for moving parts used in aerospace, and in particular to a coated self-lubricating radial joint bearing space irradiation fixture and its working method. Background Technology

[0002] Coated self-lubricating spherical plain bearings refer to bearings whose relatively moving surfaces (the inner spherical surface of the outer ring and the outer spherical surface of the inner ring) are coated with materials possessing self-lubricating properties using plating / coating techniques such as physical vapor deposition and chemical vapor deposition. Due to the wide availability of self-lubricating coating materials and their strong adaptability to extreme operating conditions, this type of bearing is widely used in spacecraft motion mechanisms, such as solar array deployment mechanisms and servo support mechanisms.

[0003] The high reliability of moving components in spacecraft requires coated self-lubricating radial spherical bearings to maintain low friction and long service life even in high-irradiation environments. Therefore, conducting long-term irradiation tests on coated self-lubricating radial spherical bearings in a ground environment is of great significance for evaluating their service performance. Summary of the Invention

[0004] The purpose of this invention is to provide a spatial irradiation fixture and working method for coated self-lubricating radial spherical plain bearings, to meet the irradiation testing requirements of coated self-lubricating radial spherical plain bearings of different sizes, to realize open and closed irradiation testing, and to improve the irradiation uniformity of spherical plain bearings.

[0005] This invention provides a space irradiation fixture for a coated self-lubricating radial spherical bearing, comprising an adapter plate and a bearing clamping module. The bearing clamping module includes a fixing member, two support columns, and a coated self-lubricating radial spherical bearing. The front end of the fixing member has a second connecting through hole, and the rear end of the fixing member has a stepped groove for accommodating and fixing the outer ring of the bearing. The width of the stepped groove is adapted to the width of the outer ring of the bearing. The fixing member has first threaded holes on both sides of the middle part of the stepped groove. The first threaded holes are adapted to the support columns, and the first threaded holes and the first connecting through holes are fixed by fasteners. The adapter plate has a limiting groove adapted to the fixing member and a third threaded hole that mates with the second connecting through hole. The fixing member slides into the adapter plate to achieve circumferential limiting and is locked and fixed by fasteners passing through the second connecting through hole and the third threaded hole.

[0006] Preferably, a single coated self-lubricating radial spherical bearing, two support columns and a fixing member constitute an independent bearing clamping module. The adapter plate has multiple sets of parallel-arranged limiting grooves, and each set of limiting grooves corresponds to a set of third threaded holes.

[0007] Preferably, the coated self-lubricating radial spherical bearing includes an outer bearing ring and an inner bearing ring. The inner spherical surface of the outer bearing ring and the outer spherical surface of the inner bearing ring are both provided with a self-lubricating coating. The support column has an L-shaped structure, with a first connecting through hole at the lower part of the support column and a clamping groove at the upper part of the support column.

[0008] Preferably, the fastener has second threaded holes on both sides of the edge of the stepped groove, and the outer ring of the bearing is locked and fixed in the stepped groove by fasteners through the second threaded holes.

[0009] Preferably, the stepped groove is a multi-level stepped groove structure.

[0010] Preferably, the support column, fastener, and adapter plate are all made of 6061 aluminum alloy.

[0011] A working method of a space irradiation fixture for a coated self-lubricating radial spherical bearing includes the following steps: Step S1, bearing pre-installation, placing the coated self-lubricating radial spherical bearing to be tested in the stepped groove of the fixing member 3, and locking the outer ring of the bearing to the fixing member by fasteners passing through the second threaded hole; Step S2, Irradiation mode selection and inner ring positioning: Select open irradiation mode or closed irradiation mode according to the test requirements, and adjust the position of the bearing inner ring relative to the bearing outer ring. Step S3: Install and lock the support columns. Insert the two support columns into the two first threaded holes of the fixing piece respectively. Adjust the vertical position of the support columns so that the clamping groove of the support column abuts and is positioned against the end face of the bearing inner ring. Lock the fastener through the first connecting through hole and the first threaded hole to complete the assembly of the single bearing clamping module. Step S4: Assemble the module and the adapter plate. Slide the fixing part of the assembled bearing clamping module into the third threaded hole of the adapter plate. Lock it by fasteners passing through the second connecting through hole and the third threaded hole to complete the fixing of a single bearing clamping module and the adapter plate. Repeat steps S1-S4 according to the number of limiting slide grooves on the adapter plate to complete the assembly and fixing of the remaining bearing clamping modules. Step S5: Irradiation test. The adapter plate is fixedly connected to the space irradiation equipment through the mounting through hole 42. The space irradiation equipment is started to carry out the irradiation test. Step S6: Disassembly after the test. After the irradiation test is completed, first turn off the space irradiation equipment, remove the adapter plate from the irradiation equipment, and then disassemble the fixing parts and support columns of each bearing clamping module in sequence, and take out the irradiated coated self-lubricating radial spherical bearing.

[0012] Preferably, in step S2, when the open irradiation mode is selected, the inner ring of the bearing is adjusted to separate from the outer ring of the bearing, so that the self-lubricating coatings on the outer spherical surface of the inner ring of the bearing and the inner spherical surface of the outer ring of the bearing are fully exposed, and then locked and positioned by the support column; when the closed irradiation mode is selected, the inner ring of the bearing is adjusted to be fully fitted with the outer ring of the bearing, so that the self-lubricating coating is sealed inside the coated self-lubricating radial spherical bearing, and then locked and positioned by the support column.

[0013] Therefore, the present invention employs the above-mentioned spatial irradiation fixture and working method for coated self-lubricating radial spherical plain bearings to meet the irradiation testing requirements of coated self-lubricating radial spherical plain bearings of different sizes, realizes open and closed irradiation testing, and improves the irradiation uniformity of spherical plain bearings.

[0014] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the open irradiation mode assembly of a coated self-lubricating radial spherical bearing space irradiation fixture according to the present invention. Figure 2 This is a schematic diagram of the closed-mode assembly of a coated self-lubricating radial spherical bearing space irradiation fixture according to the present invention. Figure 3 This is a schematic diagram of the support column of a coated self-lubricating radial spherical bearing space irradiation fixture according to the present invention; Figure 4 This is a schematic diagram of the structure of the fixing component of the space irradiation fixture for a coated self-lubricating radial spherical bearing according to the present invention; Figure 5 This is a schematic diagram of the structure of the adapter plate of the coated self-lubricating radial joint bearing space irradiation fixture of the present invention; Figure 6 This is a flowchart illustrating the working method of a coated self-lubricating radial joint bearing space irradiation fixture according to the present invention.

[0016] Figure Labels 1. Coated self-lubricating radial spherical plain bearing; 11. Bearing outer ring; 12. Bearing inner ring; 2. Support column; 21. First connecting through hole; 22. Clamping groove; 3. Fixing component; 31. Second connecting through hole; 32. Stepped groove; 33. First threaded hole; 34. Second threaded hole; 4. Adapter plate; 41. Third threaded hole; 42. Mounting through hole; 43. Limiting slide groove. Detailed Implementation

[0017] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0019] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example 1 like Figures 1-6 As shown, this invention discloses a space irradiation fixture for a coated self-lubricating radial spherical plain bearing, comprising an adapter plate 4 and at least one set of bearing clamping modules. Each set of bearing clamping modules includes a fixing member 3, two support columns 2, and a coated self-lubricating radial spherical plain bearing 1 to be tested. The coated self-lubricating radial spherical plain bearing 1 includes an outer bearing ring 11 and an inner bearing ring 12. Both the inner spherical surface of the outer bearing ring 11 and the outer spherical surface of the inner bearing ring 12 are coated with a self-lubricating coating. The support columns 2 have an L-shaped structure, with a first connecting through hole 21 at the bottom and a clamping groove 22 at the top for clamping and fixing the inner bearing ring 12.

[0021] The front end of the fastener 3 has a second connecting through hole 31, and the rear end of the fastener 3 has a stepped groove 32 for accommodating and fixing the outer ring 11 of the bearing. The width of the stepped groove 32 is adapted to the width of the outer ring 11 of the bearing. The fastener 3 has first threaded holes 33 on both sides of the middle part of the stepped groove 32. The first threaded holes 33 are adapted to the support column 2 to restrict the support column 2 to slide only in the vertical direction. The first threaded holes 33 and the first connecting through hole 21 are engaged with fasteners to fix the support column 2. The fastener 3 has second threaded holes 34 on both sides of the edge of the stepped groove 32. The second threaded holes 34 are used to lock and fix the outer ring 11 of the bearing in the stepped groove 32 with fasteners.

[0022] The adapter plate 4 has a limiting groove 43 adapted to the fixing member 3 and a third threaded hole 41 that mates with the second connecting through hole 31. The fixing member 3 slides into the adapter plate 4 to achieve circumferential limiting and is locked and fixed by fasteners passing through the second connecting through hole 31 and the third threaded hole 41. The adapter plate 4 also has a mounting through hole 42, which connects the adapter plate 4 to the rotating moving parts of the space irradiation equipment by fasteners.

[0023] A single coated self-lubricating radial spherical bearing 1, two support columns 2 and a fixing member 3 constitute an independent bearing clamping module. The adapter plate 4 has multiple sets of parallel-arranged limiting grooves 43. Each set of limiting grooves 43 corresponds to a set of third threaded holes 41 for installing multiple sets of bearing clamping modules.

[0024] The fixture has two working modes: open irradiation and closed irradiation. In open irradiation mode, the outer spherical surface of the bearing inner ring 12 is separated from the inner spherical surface of the bearing outer ring 11, and the self-lubricating coating is directly exposed to the irradiation environment. The clamping grooves 22 of the two support columns 2 respectively abut against the two end faces of the bearing inner ring 12 and lock them in place, so that the bearing inner ring 12 and the bearing outer ring 11 form a preset irradiation gap. In closed irradiation mode, the outer spherical surface of the bearing inner ring 12 is completely in contact with the inner spherical surface of the bearing outer ring 11. The self-lubricating coating is sealed inside the coated self-lubricating radial spherical bearing 1 and is not directly exposed to the irradiation environment. The clamping grooves 22 of the two support columns 2 respectively abut against the two end faces of the bearing inner ring 12 and lock them in place, so that the bearing inner ring 12 and the bearing outer ring 11 remain in contact.

[0025] The clamp can be connected to the drive shaft to drive the entire clamp to rotate, ensuring the uniformity of irradiation of the coated self-lubricating radial spherical plain bearing. The stepped groove 32 has a multi-level stepped groove structure to accommodate bearing outer rings of different outer diameters. The support column 2, the fixing part 3, and the adapter plate 4 are all made of 6061 aluminum alloy.

[0026] A method for operating a coated self-lubricating radial spherical bearing space irradiation fixture includes the following steps: Step S1: Pre-install the bearing. Place the coated self-lubricating radial spherical bearing 1 to be tested into the stepped groove 32 of the fixing part 3, and lock the outer ring 11 of the bearing to the fixing part 3 by fasteners passing through the second threaded hole 34.

[0027] Step S2: Irradiation mode selection and inner ring positioning. Select either open irradiation mode or closed irradiation mode according to the test requirements, and adjust the position of the bearing inner ring 12 relative to the bearing outer ring 11.

[0028] In step S2, when the open irradiation mode is selected, the inner ring 12 of the bearing is adjusted to separate from the outer ring 11 of the bearing, so that the self-lubricating coatings on the outer spherical surface of the inner ring 12 and the inner spherical surface of the outer ring 11 of the bearing are fully exposed, and then locked and positioned by the support column 2; when the closed irradiation mode is selected, the inner ring 12 of the bearing is adjusted to fully fit with the outer ring 11 of the bearing, so that the self-lubricating coating is sealed inside the coated self-lubricating radial spherical bearing 1, and then locked and positioned by the support column 2.

[0029] Step S3: Install and lock the support columns 2. Insert the two support columns 2 into the two first threaded holes 33 of the fixing piece 3 respectively. Adjust the vertical position of the support columns 2 so that the clamping groove of the support column 2 abuts and is positioned against the end face of the bearing inner ring 12. Lock the fasteners through the first connecting through hole 21 and the first threaded hole 33 to complete the assembly of the single bearing clamping module.

[0030] Step S4: Assemble the module and adapter plate 4. Slide the fixing piece 3 of the assembled bearing clamping module into the third threaded hole 41 of the adapter plate 4. Lock the module with fasteners passing through the second connecting through hole 31 and the third threaded hole 41 to complete the fixing of a single bearing clamping module to the adapter plate 4. Repeat steps S1-S4 according to the number of limiting grooves 43 in the adapter plate 4 to complete the assembly and fixing of the remaining bearing clamping modules.

[0031] Step S5: Irradiation test. Connect the adapter plate 4 to the space irradiation equipment through the mounting through hole 42, start the space irradiation equipment, and carry out the irradiation test.

[0032] In step S5, the fixture is connected to the drive shaft of the space irradiation equipment. During the irradiation test, the drive shaft drives the adapter plate 4 and all bearing clamping modules to rotate synchronously to ensure the irradiation uniformity of each bearing.

[0033] Step S6: Disassembly after the test. After the irradiation test is completed, first turn off the space irradiation equipment, remove the adapter plate 4 from the irradiation equipment, and then disassemble the fixing parts 3 and support columns 2 of each bearing clamping module in sequence, and take out the irradiated coated self-lubricating radial spherical bearing 1.

[0034] Therefore, this invention employs the aforementioned spatial irradiation fixture and working method for coated self-lubricating radial spherical plain bearings to meet the irradiation testing requirements of coated self-lubricating radial spherical plain bearings of different sizes. Furthermore, it features two irradiation modes, enabling open and closed irradiation testing, satisfying the needs for both direct and closed irradiation of the inner and outer ring spherical coatings of coated self-lubricating radial spherical plain bearings. The adapter plate can be combined with existing irradiation devices to achieve rotation of the coated self-lubricating radial spherical plain bearings, improving the irradiation uniformity of the bearings.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A coated self-lubricating radial joint bearing space irradiation fixture, characterized in that, The system includes an adapter plate and a bearing clamping module. The bearing clamping module includes a fixing component, a support column, and a coated self-lubricating radial spherical bearing. There are two support columns. The coated self-lubricating radial spherical bearing includes an outer ring and an inner ring. The inner spherical surface of the outer ring and the outer spherical surface of the inner ring are both coated with a self-lubricating coating. The support column has an L-shaped structure. The lower part of the support column has a first connecting through hole, and the upper part of the support column has a clamping groove. The front end of the fastener is provided with a second connecting through hole, and the rear end of the fastener is provided with a stepped groove for accommodating and fixing the outer ring of the bearing. The width of the stepped groove is adapted to the width of the outer ring of the bearing. The fastener is provided with a first threaded hole on both sides of the middle part of the stepped groove. The first threaded hole is adapted to the support column. The first threaded hole and the first connecting through hole are engaged by fasteners to fix the support column. The adapter plate is provided with a limiting groove that matches the fixing component and a third threaded hole that mates with the second connecting through hole. The fixing component slides into the adapter plate to achieve circumferential limiting and is locked and fixed by fasteners passing through the second connecting through hole and the third threaded hole. The fastener has second threaded holes on both sides of the edge of the stepped groove. The second threaded holes lock the outer ring of the bearing in the stepped groove through fasteners. The stepped groove has a multi-level stepped groove structure.

2. The coated self-lubricating radial joint bearing space irradiation fixture according to claim 1, characterized in that, A single coated self-lubricating radial spherical bearing, two support columns and a fixing component constitute an independent bearing clamping module. The adapter plate has multiple sets of parallel limit grooves, and each set of limit grooves corresponds to a set of third threaded holes.

3. The coated self-lubricating radial joint bearing space irradiation fixture according to claim 1, characterized in that, The support columns, fasteners, and adapter plates are all made of 6061 aluminum alloy.

4. The working method of a coated self-lubricating radial spherical bearing space irradiation fixture as described in any one of claims 1-3, characterized in that, Includes the following steps: Step S1: Pre-install the bearing. Place the coated self-lubricating radial spherical plain bearing to be tested into the stepped groove of the fixing part, and lock the outer ring of the bearing to the fixing part by passing the fastener through the second threaded hole. Step S2: Irradiation mode selection and bearing inner ring positioning. Select open irradiation mode or closed irradiation mode according to the test requirements, and adjust the position of the bearing inner ring relative to the bearing outer ring. Step S3: Install and lock the support columns. Insert the two support columns into the two first threaded holes of the fixing piece respectively. Adjust the vertical position of the support columns so that the clamping groove of the support column abuts and is positioned against the end face of the bearing inner ring. Lock the fastener through the first connecting through hole and the first threaded hole to complete the assembly of the single bearing clamping module. Step S4: Assemble the module and the adapter plate. Slide the fixing part of the assembled bearing clamping module into the third threaded hole of the adapter plate. Lock it by fasteners passing through the second connecting through hole and the third threaded hole to complete the fixing of a single bearing clamping module and the adapter plate. Repeat steps S1-S4 according to the number of limiting slide grooves in the adapter plate to complete the assembly and fixing of the remaining bearing clamping modules. Step S5: Irradiation test. Connect the adapter plate to the space irradiation equipment through the mounting through hole, start the space irradiation equipment, and carry out the irradiation test. Step S6: Disassembly after the test. After the irradiation test is completed, first turn off the space irradiation equipment, remove the adapter plate from the irradiation equipment, and then disassemble the fixing parts and support columns of each bearing clamping module in sequence, and take out the irradiated coated self-lubricating radial spherical bearing.

5. The working method of a coated self-lubricating radial spherical bearing space irradiation fixture according to claim 4, characterized in that, In step S2, when the open irradiation mode is selected, the inner ring of the bearing is adjusted to separate from the outer ring of the bearing so that the self-lubricating coatings on the outer spherical surface of the inner ring of the bearing and the inner spherical surface of the outer ring of the bearing are fully exposed, and then locked and positioned by the support column; when the closed irradiation mode is selected, the inner ring of the bearing is adjusted to be fully fitted with the outer ring of the bearing so that the self-lubricating coating is sealed inside the coated self-lubricating radial spherical bearing, and then locked and positioned by the support column.

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