Assembling method and using method of anti-falling fastening device

Abstract

The invention discloses an assembling method and a using method of an anti-falling fastening device, and belongs to the technical field of anti-falling fastening. An assembling step: selecting a limiting cap, wherein the initial state of the closing end side of the limiting cap is a cylindrical structure; a limiting cap is installed on the positioning tool, and a spring and a connecting bolt are installed in a cap cylinder part; the assembled limiting cap is placed on a pressing machine, a closing tool is placed on the cylindrical structure, the pressing machine acts on the closing tool, the cylindrical structure is closed inwards under the cooperation of the closing tool and the pressing machine to form a through hole, and closing forming of the closing end of the limiting cap is achieved; and the pressing machine is reset, the anti-falling fastening device is taken down, the opening is closed, the positioning tool is located, and the positioning tool is separated from the anti-falling fastening device. The limiting cap is subjected to closing-up operation, so that the closing-up deformation and closing-up quality of the limiting cap can both meet the requirements, high-quality assembly of the anti-falling fastening device is achieved, the anti-falling fastening device can be kept in a state of being connected with single-machine equipment, and the single-machine equipment can be maintained and installed conveniently.

Description

Technical Field

[0001] The invention relates to an assembly method and a use method of an anti-slip fastening device, belonging to the technical field of anti-slip fastening. Background Art

[0002] The platform cabin and stand-alone equipment in aerospace equipment must not only meet connection requirements, but also meet the requirement that the stand-alone equipment can be separated from the platform cabin to facilitate regular maintenance and overhaul of the stand-alone equipment. Therefore, the connection between the stand-alone equipment and the platform cabin must be detachable.

[0003] Most of the existing stand-alone equipment is connected to the platform cabin by bolts. Specifically, the rod of the bolt passes through the mounting hole on the stand-alone equipment and cooperates with the threaded hole on the platform cabin to complete the connection between the two. When the stand-alone equipment needs maintenance, the bolt is rotated in the opposite direction to disengage from the threaded hole on the platform cabin, so that the disassembly between the stand-alone equipment and the platform cabin can be completed.

[0004] However, if bolts are used to connect stand-alone equipment and a platform cabin in outer space, it usually takes two people to complete the installation and disassembly between the stand-alone equipment and the platform cabin. Especially during the disassembly process, since there is no connection between the disassembled bolts and the stand-alone equipment and the parts are independent of each other, it is easy to cause the bolt components to fall off, making it inconvenient to connect the stand-alone equipment that has been maintained to the platform cabin later, affecting the equipment maintenance efficiency and increasing the maintenance cost.

[0005] Therefore, there is a need for an anti-detachment fastening device which can meet the needs of connecting the stand-alone equipment with the platform cabin, and at the same time maintain the connection state with the stand-alone equipment to prevent parts from falling off during maintenance of the stand-alone equipment. The anti-detachment fastening device mainly limits the fastener in a certain cavity, and constrains the loosened fastener through the limiting cavity to prevent it from falling off. However, it also brings new problems. How to assemble the fastener in the limiting cavity, especially in the environment of outer space, how to assemble it to ensure the stable constraint of the limiting cavity on the fastener, and avoid the falling of parts in outer space. At the same time, it can also meet the needs of connection and disconnection between the stand-alone equipment and the platform cabin according to different requirements. Summary of the invention

[0006] The present invention aims at solving the deficiencies in the prior art and provides an assembly method for an anti-slip fastening device.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: an assembling method of an anti-slip fastening device, the anti-slip fastening device comprising a limiting cap, a connecting bolt and a spring arranged on the limiting cap, the connecting bolt comprising a bolt head and a bolt rod, the bolt rod being provided with a rod thread; the limiting cap comprises a cap barrel part and a cap sleeve part of an integrated structure, one end of the cap barrel part is a closing end, the closing end is provided with a through hole, the bolt head is located in the cap barrel part, the aperture of the through hole is smaller than the outer diameter of the bolt head, the cap sleeve part is arranged at the other end of the cap barrel part, the cap sleeve part is provided with a rod hole for the bolt rod to pass through, the cap sleeve part is provided with a connecting thread, the spring is sleeved on the bolt rod and is located between the cap sleeve part and the bolt head;

[0008] The assembly steps are as follows:

[0009] S1. According to the processing requirements, select the limit cap with the material and thickness that meet the requirements, and the initial state of the closing end of the limit cap is a cylindrical structure;

[0010] S2. Install the cap barrel of the limit cap on the positioning fixture, and install the spring and connecting bolts in the cap barrel;

[0011] S3. The assembled limit cap is placed on the lower die seat of the press, and the closing tooling is placed on the cylindrical structure. The press is actuated, and the pressing plate of the press acts on the closing tooling. The cylindrical structure can close inwardly with the cooperation of the closing tooling and the press to form a through hole to constrain the bolt head of the connecting bolt. The closing end of the limit cap is closed and formed, and the assembly of the anti-slip fastening device is completed;

[0012] S4. The press is reset, and the closing tooling, the anti-slip fastening device and the positioning tooling are removed, and the positioning tooling is separated from the anti-slip fastening device;

[0013] S5. Repeat the above steps until all anti-slip fastening devices are processed.

[0014] The beneficial effects of the present invention are as follows: in order to ensure that the connecting bolt separated from the platform cabin can maintain the connection state with the stand-alone equipment and avoid the problem of the connecting bolt falling off when it is separated from the platform cabin, the limiting cap is adopted and the connecting bolt is constrained on the stand-alone equipment through the closing end of the limiting cap. The middle part of the connecting bolt is provided with a bolt head arranged in the limiting cap, and the bolt head has the function of preventing the connecting bolt from falling off from the limiting cap. The spring is located between the bolt head and the cap sleeve. When the connecting bolt and the platform cabin are loosened, the spring can push the bolt head to the closing end through its elastic force. The astronaut can see the top end surface of the bolt head of the connecting bolt through the through hole, and judge that the connecting bolt is in a loose state without twisting it. If the spring is constrained in the limit cap, an improved assembly method is required. The limit cap is processed first. In order to facilitate the assembly of the connecting bolts and the spring, the initial state of the closing end of the limit cap is a cylindrical structure. The limit cap is installed on the positioning fixture. The spring and the connecting bolts are placed in the inner cavity of the limit cap and then placed in the press to wait for the closing operation. When closing, not only axial force but also radial force is required. The two work together to complete the closing of the limit cap, so that the closing end of the limit cap can form a through hole to constrain the limit part. In order for the axial force and radial force borne by the limit cap to achieve the purpose of closing the end of the limit cap, a closing fixture is placed at the open end of the cylindrical structure, and the closing operation of the limit cap is achieved through the cooperation of the closing fixture and the pressure of the press. The closing operation of the limit cap is performed by the assembly method, so that the closing deformation and closing quality of the limit cap can meet the requirements, and the high-quality assembly of the anti-slip fastening device is achieved.

[0015] The assembled anti-slip fastening device is connected to the single-machine equipment through the connecting thread, and the connection and separation of the single-machine equipment and the platform cabin can be achieved through the connecting bolts. The through hole at the closing end is convenient for using a wrench tool to act on the connecting bolt for installation and disassembly operations, and on the other hand, the through hole is also visible, which is beneficial to the operator's visual operation. Once the connecting bolt is separated from the platform cabin, the spring will push the connecting bolt toward the through hole, and the operator can observe the position of the bolt head through the through hole and promptly obtain the information that the connecting bolt has been disassembled; after disassembly between the connecting bolt and the platform cabin, the connecting bolt will not fall off under the action of the limit cap, and can always maintain the connection state with the single-machine equipment. At the same time, it will not hinder the maintenance of the single-machine equipment. The anti-slip fastening device is suitable for on-orbit maintenance.

[0016] Based on the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, the limiting cap is made of aluminum alloy, and the wall thickness of the limiting cap is 0.5-1 mm.

[0018] The beneficial effect of adopting the above further scheme is that the wall thickness of the limit cap must meet the required strength requirements while also meeting the needs of closing deformation. The limit cap of aluminum alloy not only has high strength performance, but also is light in weight. It is better in mechanical properties and weight reduction, and is more suitable for use in the aerospace field.

[0019] Furthermore, the closing tooling in the above step S3 is provided with a barrel positioning hole, and the barrel positioning hole closes the cylindrical structure of the closing end of the limiting cap inward under the action of the press, and a truncated cone hole is provided at the bottom of the barrel positioning hole, the large end of the truncated cone hole is connected to the barrel positioning hole, and the corner of the small end of the truncated cone hole is an arc transition.

[0020] The beneficial effect of adopting the above-mentioned further scheme is that the closing tooling is not only simple in structure but also easy to operate. It only needs to be placed on the limiting cap of the assembled spring and connecting bolt, and the press acts on the closing tooling. Under the action of the barrel positioning hole of the closing tooling and the truncated cone-shaped hole at the bottom of the hole, the limiting cap can be deformed to form a closing end that can constrain the spring and the connecting bolt in the limiting cap, thereby meeting the requirement that the connecting bolt will not fall off from the limiting cap when it is detached from the platform cabin, thereby ensuring that the anti-detachment fastening device can maintain a connection with the single-machine equipment.

[0021] Furthermore, the inclination angle of the generatrix of the truncated cone-shaped hole is α, 5°<α<8°.

[0022] The beneficial effect of adopting the above-mentioned further scheme is that the closing end of the limit cap needs to be subjected to axial force and radial force to complete the closing, and the limit cap is subjected to vertical force F. Due to the design of the truncated cone hole of the closing tooling, the vertical force F is decomposed into a component force F2 along the inclined surface, that is, along the generatrix direction of the truncated cone hole, and a component force F1 perpendicular to the inclined surface. F1 is the force that bends the closing. When the vertical force F remains unchanged, the larger the angle α, the larger F1 is, and the easier the closing is. If the angle α is smaller, the smaller F1 is, and in order to meet the closing requirements, the vertical force F needs to be increased, and F2 will increase accordingly. The increase in F2 will cause bulging of the closing of the limit cap, which cannot meet the requirements of the deformation amount and closing quality of the closing end of the limit cap. Therefore, a suitable α is used to meet the requirements of the deformation amount and closing quality of the closing of the limit cap, thereby realizing the assembly of the anti-slip fastening device.

[0023] Furthermore, the inclination angle of the generatrix of the truncated cone-shaped hole is 6°≤α≤7°.

[0024] The beneficial effect of adopting the above further solution is that, at this inclination angle, the closing end of the limiting cap can have a better closing deformation amount and closing quality, thereby achieving high-quality assembly of the anti-slip fastening device.

[0025] Furthermore, the depth of the truncated cone hole is 4-5 mm.

[0026] The beneficial effect of adopting the above further scheme is that the depth of the truncated cone hole is limited, which can guide the closing end of the limiting cap to perform the closing operation, which can not only meet the formation of the closing end of the limiting cap, but also will not affect the quality of other parts of the cap barrel of the limiting cap.

[0027] Furthermore, the pressure of the press is 25000-30000N.

[0028] The beneficial effect of adopting the above further scheme is that the pressure of the press must not only meet the pressure requirement for the deformation of the closing, but also cannot be too large to cause bulging of the closing of the limiting cap. Therefore, the pressure of the press is limited to meet the requirements of the deformation amount and closing quality of the closing end of the limiting cap.

[0029] Furthermore, the positioning tool in the above step S2 is provided with a connecting hole for connecting with the connecting thread, and the connecting hole is provided with an internal thread that matches the connecting thread.

[0030] The beneficial effect of adopting the above further solution is that the limit cap can be installed on the positioning fixture by means of a threaded connection, thereby ensuring the stability of the limit cap when the press is in operation and meeting the quality requirements of the limit cap closing.

[0031] Furthermore, a mounting hole is provided on the lower die base of the press, and the connecting sleeve includes an insertion section and a positioning section that can be inserted into the mounting hole, the outer diameter of the positioning section is larger than the outer diameter of the insertion section, and the insertion section and the positioning section cooperate to form a shoulder acting on the lower die base.

[0032] The beneficial effect of adopting the above further solution is that the cap sleeve is installed on the positioning fixture through a threaded connection, and the mounting hole on the lower die base of the press and the shoulder on the positioning fixture cooperate to achieve stable cooperation of the positioning fixture on the press.

[0033] Furthermore, a wrench structure is provided on the outer circumferential surface of the cap sleeve portion, and the outer diameter of the wrench structure of the cap sleeve portion is greater than the outer diameter of the cap barrel portion.

[0034] The beneficial effect of adopting the above-mentioned further scheme is that the cap sleeve part needs to be threadedly connected with the positioning tool during assembly, and needs to be threadedly connected with the stand-alone equipment during use. A wrench structure, such as an external hexagonal structure, can be provided on the outer peripheral surface of the cap sleeve part to facilitate its installation on the positioning tool or the stand-alone equipment by turning the cap sleeve part by a wrench sleeve or a wrench.

[0035] The present invention also relates to a method for using the anti-slip fastening device obtained based on the assembly method of the anti-slip fastening device, the steps of which are as follows:

[0036] a) The connecting thread on the limit cap matches the threaded hole on the ear piece of the stand-alone device, and rotate clockwise with a tightening torque of 8 N.m until the limit cap is installed on the ear piece of the stand-alone device;

[0037] b) The end of the wrench is inserted into the wrench groove of the connecting bolt through the through hole on the limit cap. The rod thread of the connecting bolt matches the threaded hole of the platform cabin. The connecting bolt is installed clockwise with a tightening torque of 5 N.m to complete the connection between the single-machine equipment and the platform cabin.

[0038] The beneficial effects of the present invention are as follows: a tightening torque of 8N.m can firmly install the limit cap on the single-machine equipment to prevent the anti-detachment fastening device from loosening or falling off; a tightening torque of 5N.m enables the connecting bolt to meet the connection requirements with the platform cabin, and when it is necessary to detach from the platform cabin, it will not affect the stable connection between the limit cap and the single-machine equipment; the anti-detachment fastening device is installed on the single-machine equipment, and the connection between the single-machine equipment and the platform cabin can be achieved through the connecting bolts, and when the single-machine equipment needs maintenance, the connecting bolts can be loosened to allow the single-machine equipment to be smoothly detached from the platform cabin. At the same time, the anti-detachment fastening device can maintain the connection state with the platform equipment to avoid the falling off of components such as connecting bolts, and can meet the connection or disassembly requirements between the single-machine equipment and the platform cabin in the aerospace field. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of the anti-slip fastening device after closing of the present invention;

[0040] Figure 2 It is a structural schematic diagram of the anti-slip fastening device before closing of the present invention;

[0041] Figure 3 It is a schematic diagram of the structure of the first and second steps of assembling the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of placing the limit cap on the press after the third step of assembling the present invention;

[0043] Figure 5 This is a structural schematic diagram of placing the closing tooling in the third step of assembling the present invention;

[0044] Figure 6 It is a structural schematic diagram of the closing tooling of the present invention;

[0045] Figure 7 It is a structural schematic diagram of the press in the operating state of the present invention;

[0046] Figure 8 It is a structural schematic diagram of the connection state between the anti-slip fastening device of the present invention and the platform cabin;

[0047] Fig. 9It is a structural schematic diagram of the anti-detachment fastening device of the present invention and the platform cabin being detached;

[0048] Fig.10 The sample drawing of the qualified limit cap;

[0049] Fig.11 This is a sample drawing of the unqualified limit cap;

[0050] In the figure, 1. limit cap; 11. cap barrel; 111. closing end; 112. through hole; 12. cap sleeve; 121. connecting thread; 122. rod hole; 2. connecting bolt; 21. bolt head; 22. bolt rod; 221. rod thread; 3. spring; 4. positioning tool; 41. insertion section; 42. positioning section; 43. connecting hole; 44. shoulder; 5. closing tool; 51. barrel positioning hole; 52. frustoconical hole; 53. arc; 6. lower die seat; 61. mounting hole; 7. single-machine equipment; 8. platform cabin. DETAILED DESCRIPTION

[0051] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0052] like Figure 1-Figure 11 As shown, an assembly method of an anti-slip fastening device, the anti-slip fastening device comprises a limiting cap 1, a connecting bolt 2 and a spring 3 arranged on the limiting cap 1, the connecting bolt 2 comprises a bolt head 21 and a bolt rod 22, and the bolt rod 22 is provided with a rod thread 221; the limiting cap 1 comprises a cap barrel portion 11 and a cap sleeve portion 12 of an integrated structure, one end of the cap barrel portion 11 is a closing end 111, and the closing end 111 is provided with a through hole 112, the bolt head 21 is located in the cap barrel portion 11, and the aperture of the through hole 112 is smaller than the outer diameter of the bolt head 21, the cap sleeve portion 12 is arranged at the other end of the cap barrel portion 11, and a rod hole 122 for the bolt rod 22 to pass through is provided in the cap sleeve portion 12, and a connecting thread 121 is provided on the cap sleeve portion 12, and the spring 3 is sleeved on the bolt rod 22 and is located between the cap sleeve portion 12 and the bolt head 21;

[0053] The assembly steps are as follows:

[0054] S1. According to the processing requirements, select the material and thickness that meet the requirements of the limit cap 1, the initial state of the closing end 111 of the limit cap 1 is a cylindrical structure;

[0055] S2. The cap barrel portion 11 of the limit cap 1 is installed on the positioning tool 4, and the spring 3 and the connecting bolt 2 are installed in the cap barrel portion 11;

[0056] S3. The assembled limit cap 1 is placed on the lower die seat 6 of the press, and the closing tool 5 is placed on the cylindrical structure. The press is actuated, and the pressing plate of the press acts on the closing tool 5. The cylindrical structure can close inwardly with the cooperation of the closing tool 5 and the press to form a through hole 112 for constraining the bolt head 21 of the connecting bolt 2. The closing end 111 of the limit cap 1 is closed and formed, and the assembly of the anti-slip fastening device is completed;

[0057] S4. The press is reset, and the closing tooling 5, the anti-slip fastening device and the positioning tooling 4 are removed, and the positioning tooling 4 is separated from the anti-slip fastening device;

[0058] S5. Repeat the above steps until all anti-slip fastening devices are processed.

[0059] The limiting cap 1 is made of aluminum alloy, and the wall thickness of the limiting cap 1 is 0.5-1mm. The wall thickness of the limiting cap 1 must meet the required strength requirements and the requirements of closing deformation. The limiting cap 1 of aluminum alloy not only has high strength performance, but also has light weight, is better in mechanical performance and weight reduction, and is more suitable for use in the aerospace field.

[0060] The closing tooling 5 in the above step S3 is provided with a barrel positioning hole 51, and the barrel positioning hole 51 closes the end of the cylindrical structure of the closing end 111 of the limiting cap 1 inward under the action of the press, and a truncated cone hole 52 is provided at the bottom of the barrel positioning hole 51, and the large end of the truncated cone hole 52 is connected to the barrel positioning hole 51, and the corner of the small end of the truncated cone hole 52 is a circular arc 53 for transition. The closing fixture 5 is not only simple in structure but also easy to operate. It only needs to be placed on the limit cap 1 of the assembled spring 3 and the connecting bolt 2, and the press acts on the closing fixture 5. Under the action of the barrel positioning hole 51 of the closing fixture 5 and the truncated cone-shaped hole 52 at the bottom of the hole, the limit cap 1 can be closed and deformed to form a closing end 111 that can constrain the spring 3 and the connecting bolt 2 in the limit cap 1, thereby meeting the requirement that the connecting bolt 2 will not fall off from the limit cap 1 when it is separated from the platform cabin 8, ensuring that the anti-dropping fastening device can maintain the connection state with the stand-alone equipment 7. The surface finish of the barrel positioning hole 51 of the closing fixture 5 is not less than Ra0.8.

[0061] The diameter of the barrel positioning hole 51 is 0.1-0.2 mm larger than the outer diameter of the cap barrel portion 11. For example, the gap between the barrel positioning hole 51 and the cap barrel portion 11 is 0.2 mm.

[0062] The inclination angle of the generatrix of the truncated cone-shaped hole 52 is α, 5°<α<8°.

[0063] Preferably, the inclination angle of the generatrix of the truncated cone-shaped hole 52 is 6°≤α≤7°.

[0064] The depth of the truncated cone hole 52 is 4-5 mm, and the pressure of the press is 25000-30000N.

[0065] Preferably, the depth of the truncated cone hole 52 is 4.1-4.5 mm, and the pressure of the press is 26000-28000N.

[0066] The positioning fixture 4 in the above step S2 is provided with a connection hole 43 for connecting with the connection thread 121, and the connection hole 43 has an internal thread adapted to the connection thread 121. The limit cap 1 can be installed on the positioning fixture 4 by threaded connection, thereby ensuring the stability of the limit cap 1 when the press is in operation and meeting the quality requirements of the closing of the limit cap 1.

[0067] The lower die base 6 of the press is provided with a mounting hole 61, and the connecting sleeve includes an insertion section 41 and a positioning section 42 that can be inserted into the mounting hole 61. The outer diameter of the positioning section 42 is larger than the outer diameter of the insertion section 41. The insertion section 41 cooperates with the positioning section 42 to form a shoulder 44 that acts on the lower die base 6. The cap sleeve portion 12 is installed on the positioning fixture 4 by threaded connection. The mounting hole 61 on the lower die base 6 of the press and the shoulder 44 on the positioning fixture 4 cooperate to achieve stable cooperation of the positioning fixture 4 on the press.

[0068] The connecting bolt 2 is made of titanium alloy. Titanium alloy has high strength, so that the connecting bolt 2 has a light weight while maintaining high strength, and can be widely used in the lightweight aerospace field.

[0069] The head of the connecting bolt 2 is provided with a wrench groove. A wrench can act on the wrench groove through the through hole 112, thereby realizing the rotation drive of the connecting bolt 2.

[0070] The outer circumference of the cap sleeve 12 is also provided with a wrench structure, and the outer diameter of the wrench structure of the cap sleeve 12 is larger than the outer diameter of the cap barrel 11. The cap sleeve 12 needs to be threadedly connected with the positioning tool 4 during assembly, and needs to be threadedly connected with the stand-alone device 7 during use. The outer circumference of the cap sleeve 12 can be provided with a wrench structure, such as an outer hexagonal structure, so that the cap sleeve 12 can be easily installed on the positioning tool 4 or the stand-alone device 7 by turning the wrench sleeve or a wrench.

[0071] like Figure 6As shown, due to the design of the truncated cone hole 52 in the closing tool 5, the pressure F of the press can be decomposed into a force F2 along the inclined surface, that is, along the generatrix direction of the truncated cone hole 52, and a force F1 perpendicular to the inclined surface, F1 = F*sinα; F2 = F*cosα; wherein the component force F1 is the force that causes the limit cap 1 to close and bend. From the above formula, when the pressure F of the press is constant, that is, when the vertical downward pressure remains unchanged, the larger the angle α, the greater the force F1, and the easier it is to close; the smaller the angle α, the smaller the component force F1, and the greater the pressure F required for closing, and the component force F2 will also increase accordingly, and the component force F2 causes the limit cap 1 to easily bulge during assembly, as shown in FIG. Fig.11 As shown, the limit cap 1 is scrapped and cannot be used; however, when α is too large, the slope at the closing point is greater, and the deformation of the limit cap 1 after assembly is greater. Therefore, a suitable α angle is required to obtain the F1 and F2 values ​​required for assembly, so that the limit cap 1 can achieve the required deformation amount and good closing quality, thereby meeting the requirements of higher assembly quality.

[0072] Example 1: The material of the limiting cap 1 is aluminum alloy, the wall thickness of the limiting cap 1 is 0.5 mm, the pressure F applied by the press is 25000 N, the inclination angle α of the generatrix of the truncated cone-shaped hole 52 in the closing tooling 5 is 3 degrees, and the depth of the truncated cone-shaped hole 52 is 4.5 mm. After the closing operation, the limiting cap 1 appears wrinkled and bulging.

[0073] Example 2: The material of the limiting cap 1 is aluminum alloy, the wall thickness of the limiting cap 1 is 0.6 mm, the pressure F applied by the press is 26000 N, the inclination angle α of the generatrix of the truncated cone hole 52 in the closing tooling 5 is 5 degrees, the depth of the truncated cone hole 52 is 4.3 mm, and the limiting cap 1 bulges after the closing operation.

[0074] Example 3, the material of the limiting cap 1 is aluminum alloy, the wall thickness of the limiting cap 1 is 0.8, the pressure F applied by the press is 27000N, the inclination angle α of the generatrix of the truncated cone-shaped hole 52 in the closing tooling 5 is 6 degrees, the depth of the truncated cone-shaped hole 52 is 4.2mm, and after the closing operation, the closing quality of the limiting cap 1 is good, and the limiting cap 1 does not bulge.

[0075] Example 4, the material of the limiting cap 1 is aluminum alloy, the wall thickness of the limiting cap 1 is 0.8, the pressure F applied by the press is 28000N, the inclination angle α of the generatrix of the truncated cone-shaped hole 52 in the closing tooling 5 is 7 degrees, and the depth of the truncated cone-shaped hole 52 is 4.2mm. After the closing operation, the closing quality of the limiting cap 1 is good, and the limiting cap 1 does not bulge.

[0076] Example 5, the material of the limit cap 1 is aluminum alloy, the wall thickness of the limit cap 1 is 1mm, the pressure F applied by the press is 28000N, the inclination angle α of the generatrix of the truncated cone-shaped hole 52 in the closing tooling 5 is 8 degrees, and the depth of the truncated cone-shaped hole 52 is 4mm. After the closing operation, the limit cap 1 is greatly deformed and cracks appear locally.

[0077] Since a too large value of α will lead to a large deformation of the limit cap 1 after assembly, when α = 3° and 5°, such as Fig.11 As shown in FIG. 1 , wrinkles and bulges will appear when the limit cap 1 is closed; and when α = 6° and 7°, as shown in FIG. Fig.10 As shown, the limit cap 1 has achieved the required deformation and good closing quality; however, when α=8°, the F value increases significantly, and the deformation of the limit cap 1 also increases, and even cracking occurs, which cannot meet the closing quality requirements of the closing end 111 of the limit cap 1. The closed product can measure the product height and whether the inner diameter of the through hole at the closing end is closed in place. The closing operation of the limit cap 1 is performed through the assembly method, so that the closing deformation and closing quality of the limit cap 1 can meet the requirements, and the high-quality assembly of the anti-slip fastening device is achieved.

[0078] The present invention also relates to a method for using the anti-slip fastening device obtained based on the assembly method of the anti-slip fastening device, the steps of which are as follows:

[0079] a) The connecting thread 121 on the limit cap 1 is matched with the threaded hole on the ear piece of the stand-alone device 7, and the limit cap 1 is rotated clockwise with a tightening torque of 8 N.m until the limit cap 1 is installed on the ear piece of the stand-alone device 7;

[0080] b) The end of the wrench passes through the through hole 112 on the limit cap 1 and is inserted into the wrench groove of the connecting bolt 2. The rod thread 221 of the connecting bolt 2 cooperates with the threaded hole of the platform cabin 8. The connecting bolt 2 is installed clockwise with a tightening torque of 5 N.m to complete the connection between the single-machine equipment 7 and the platform cabin 8.

[0081] Use the hexagonal wrench tool to insert the outer hexagonal wrench structure of the limiting cap 1, and rotate it clockwise to install the anti-slip fastening device on the ear piece of the single-machine equipment 7, use the hexagonal wrench wrench to insert the inner hexagonal wrench groove of the connecting bolt 2, and rotate the connecting bolt 2 clockwise. The connecting bolt 2 is threadedly connected to the platform cabin 8, thereby realizing the connection between the single-machine equipment 7 and the platform cabin 8. When maintenance is needed, rotate the connecting bolt 2 counterclockwise. After the connecting bolt 2 is separated from the platform cabin 8, it will be bounced to the closing end 111 under the action of the spring 3. The operator can observe the end face of the bolt head 21 of the connecting bolt 2 through the through hole 112 to know that the connecting bolt 2 and the platform cabin 8 have been separated. The disassembly of the single-machine equipment 7 is completed, and the single-machine equipment 7 can be maintained separately. The anti-slip fastening device always maintains a connection state with the single-machine equipment 7 through the limiting cap 1, and there will be no problem of parts falling off, which is suitable for on-orbit maintenance in outer space.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for assembling an anti-slip fastening device, characterized in that: The anti-dropping fastening device comprises a limiting cap (1), a connecting bolt (2) arranged on the limiting cap (1) and a spring (3); the connecting bolt (2) comprises a bolt head (21) and a bolt rod (22); the bolt rod (22) is provided with a rod thread (221); the limiting cap (1) comprises a cap barrel (11) and a cap sleeve (12) of an integral structure; one end of the cap barrel (11) is a closing end (111); the closing end (111) is provided with a through hole (112); the bolt head (21) is provided with a through hole (112); 21) is located in the cap barrel portion (11), the hole diameter of the through hole (112) is smaller than the outer diameter of the bolt head (21), the cap sleeve portion (12) is arranged at the other end of the cap barrel portion (11), a rod hole (122) is provided in the cap sleeve portion (12) for the bolt rod portion (22) to pass through, and a connecting thread (121) is provided on the cap sleeve portion (12), the spring (3) is sleeved on the bolt rod portion (22) and is located between the cap sleeve portion (12) and the bolt head (21); The assembly steps are as follows: S1. According to the processing requirements, select the material and thickness that meet the requirements of the limit cap (1), the initial state of the closing end (111) of the limit cap (1) is a cylindrical structure; S2. The cap tube portion (11) of the limit cap (1) is installed on the positioning tool (4), and the spring (3) and the connecting bolt (2) are installed in the cap tube portion (11); S3. The above-assembled limiting cap (1) is placed on the lower die seat (6) of the press, and the closing tooling (5) is placed on the cylindrical structure. The press is actuated, and the pressing plate of the press acts on the closing tooling (5). The cylindrical structure can close inwards with the cooperation of the closing tooling (5) and the press to form a through hole (112) for constraining the bolt head (21) of the connecting bolt (2). The closing end (111) of the limiting cap (1) is closed and formed, and the assembly of the anti-slip fastening device is completed; S4. The press is reset, and the closing tooling (5), the anti-slip fastening device and the positioning tooling (4) are removed, and the positioning tooling (4) is separated from the anti-slip fastening device; S5. Repeat the above steps until all anti-slip fastening devices are processed.

2. The assembly method of the anti-slip fastening device according to claim 1, characterized in that: In the above step S1, the limiting cap (1) is made of aluminum alloy, and the wall thickness of the limiting cap (1) is 0.5-1 mm.

3. The assembly method of the anti-slip fastening device according to claim 1, characterized in that: The closing tool (5) in the above step S3 is provided with a cylinder positioning hole (51), and the cylinder positioning hole (51) closes the cylindrical structure of the closing end (111) of the limiting cap (1) inward under the action of a press, and a truncated cone hole (52) is provided at the bottom of the cylinder positioning hole (51), and the large end of the truncated cone hole (52) is connected to the cylinder positioning hole (51), and the corner of the small end of the truncated cone hole (52) is a circular arc (53) transition.

4. The method for assembling the anti-slip fastening device according to claim 3, characterized in that: The inclination angle of the generatrix of the truncated cone-shaped hole (52) is α, 5°<α<8°.

5. The method for assembling the anti-slip fastening device according to claim 4, characterized in that: The inclination angle of the generatrix of the truncated cone-shaped hole (52) is 6°≤α≤7°.

6. The method for assembling the anti-dropping fastening device according to claim 3, characterized in that: The depth of the truncated cone hole (52) is 4-5 mm; and / or the pressure of the press is 25000-30000N.

7. The method for assembling the anti-slip fastening device according to any one of claims 1 to 6, characterized in that: The positioning tool (4) in the above step S2 is provided with a connecting hole (43) for connecting with the connecting thread (121), and the connecting hole (43) has an internal thread that matches the connecting thread (121).

8. The method for assembling the anti-slip fastening device according to claim 7, characterized in that: The lower die base (6) of the press is provided with a mounting hole (61), and the connecting sleeve comprises an insertion section (41) and a positioning section (42) which can be inserted into the mounting hole (61), the outer diameter of the positioning section (42) is larger than the outer diameter of the insertion section (41), and the insertion section (41) and the positioning section (42) cooperate to form a shoulder (44) acting on the lower die base (6).

9. The method for assembling the anti-dropping fastening device according to claim 1, characterized in that: A wrench structure is provided on the outer peripheral surface of the cap sleeve portion (12), and the outer diameter of the wrench structure of the cap sleeve portion (12) is greater than the outer diameter of the cap barrel portion (11).

10. A method for using an anti-slip fastening device obtained by the assembly method of the anti-slip fastening device according to any one of claims 1 to 9, characterized in that: Here are the steps: a) The connecting thread (121) on the limit cap (1) is matched with the threaded hole on the ear piece of the stand-alone device (7), and the limit cap (1) is rotated clockwise with a tightening torque of 8 N.m until the limit cap (1) is installed on the ear piece of the stand-alone device (7); b) The end of the wrench is inserted into the wrench groove of the connecting bolt (2) through the through hole (112) on the limiting cap (1), the rod thread (221) of the connecting bolt (2) is matched with the threaded hole of the platform cabin (8), and the connecting bolt (2) is installed clockwise with a tightening torque of 5 N.m to complete the connection between the single-machine equipment (7) and the platform cabin (8).

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