An auxiliary support joint

Abstract

This invention belongs to the field of aerospace machining technology and discloses an auxiliary support joint, which includes a joint body, a support member, and a fixing member. The joint body includes a connecting part that can be connected to a mounting surface; the support member is connected to the joint body through an elastic member that can provide an upward elastic force to the support member, and the upper surface of the support member is the support surface; the fixing member is movably connected to the joint body in the vertical direction and is used to fix or release the support member, and the fixing member can fix the support member at different heights. The above-mentioned auxiliary support joint can be used for the installation of aircraft fuselage fairing assemblies. During installation, the fixing member can release the support member and activate its floating function, thereby providing support force to the ball joint, so that the fairing assembly as a whole receives an upward support force, making it easier for the operator to apply external force to move the fairing assembly, thereby aligning the fairing assembly with the positioning hole and avoiding improper deformation of the fairing assembly due to forced fit, which would affect the function of the fairing assembly.

Description

Technical Field

[0001] This invention relates to the field of aerospace machining technology, and in particular to an auxiliary support joint. Background Technology

[0002] A fairing is a streamlined component that covers protrusions or discontinuities in structural shape to reduce air resistance and is widely used in the aerospace field. When installing a fairing on an aircraft fuselage, it is usually necessary to align the fuselage positioning holes with the fairing assembly positioning holes to secure the fairing assembly.

[0003] In existing technologies, for lightweight wing-body fairing assemblies, assembly operators can directly lift and move the fairing assembly to align the component's positioning holes with corresponding positioning holes on the aircraft. For heavier wing-body fairing assemblies, assembly operators often use positioning devices to move the assembly and align the positioning holes. However, positioning devices are rarely able to directly align the positioning holes; they usually require forced assembly to deform the product to achieve alignment, which can affect the fairing's functionality. Furthermore, using positioning devices with ultra-high attitude adjustment accuracy would be too costly. Summary of the Invention

[0004] The purpose of this invention is to provide an auxiliary support joint to achieve simple and efficient alignment between the fairing assembly and the fuselage positioning hole, while avoiding improper deformation of the fairing assembly.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An auxiliary support joint, characterized in that it comprises:

[0007] The connector body includes a connecting portion that can be connected to a mounting surface;

[0008] A support member is connected to the connector body via an elastic element, the elastic element providing an upward elastic force to the support member, and the upper surface of the support member serving as a support surface.

[0009] A fastener is movably connected to the connector body in a vertical direction. The fastener is used to fix or release the support member, and can fix the support member at different heights.

[0010] Preferably, the connector body includes a plurality of parallel support columns, the circumferential surface of the support columns is provided with threads, and the fixing member is connected to the threads.

[0011] Preferably, the fastener ring is provided with a plurality of mating protrusions, which are spaced apart and are used to connect with the threaded connection.

[0012] Preferably, the fixing member is further provided with a limiting member, which is disposed on the mating protrusion and can abut against and limit the support column.

[0013] Preferably, the number of the support column, the mating protrusion, and the limiting member are the same and they correspond one-to-one.

[0014] Preferably, the fixing member is further provided with an outer ring handle portion, the limiting member extends out of the support column, and the outer ring handle portion is connected to the limiting member and surrounds the support column.

[0015] Preferably, the top of the fixing member is provided with a fixing ring, the elastic member is an elastic connecting rope, and a plurality of the elastic connecting ropes are arranged between the fixing ring and the circumferential surface of the support member.

[0016] Preferably, the connecting part is disposed at the bottom of the connector body, and the connecting part includes a connecting hole for fixing the connecting part to the mounting surface.

[0017] Preferably, the support member includes a hemispherical support shell, the concave surface at the top of the support shell is a support surface, the support surface is a conical surface, and the conical surface is used to provide support force to the ball head.

[0018] Preferably, the upper surface of the fastener is provided with a contoured surface that matches the shape of the protruding surface of the support shell, and the contoured surface is used to fix the support shell.

[0019] Beneficial Effects: This embodiment provides an auxiliary support connector, which includes a connector body, a support member, and a fixing member. The connector body includes a connecting portion that can be connected to a mounting surface; the support member is connected to the connector body via an elastic member that provides an upward elastic force to the support member, and the upper surface of the support member serves as the support surface; the fixing member is movably connected to the connector body in a vertical direction and is used to fix or release the support member, and can fix the support member at different heights. The above-mentioned auxiliary support connector can be used for the installation of aircraft fuselage fairing assemblies. During installation, the fixing member can release the support member to enable the floating function of the support member, thereby allowing the support member to provide support force to the ball joint, so that the fairing assembly as a whole receives an upward support force, making it easier for the operator to apply external force to move the fairing assembly, thereby aligning the fairing assembly with the positioning hole and avoiding improper deformation of the fairing assembly due to forced fit, which would affect the function of the fairing assembly. Attached Figure Description

[0020] Figure 1 This is an overall schematic diagram of the auxiliary support joint provided by the present invention;

[0021] Figure 2This is a schematic diagram of the connector body of the auxiliary support connector provided by the present invention;

[0022] Figure 3 This is a schematic diagram of the support member of the auxiliary support joint provided by the present invention;

[0023] Figure 4 This is a schematic diagram of the fixing component of the auxiliary support joint provided by the present invention;

[0024] Figure 5 This is a schematic diagram of the auxiliary support joint provided by the present invention in application;

[0025] Figure 6 This is a schematic diagram of the auxiliary support joint provided by the present invention being connected to the ball head in the conformal tooling.

[0026] In the picture:

[0027] 1. Connector body; 11. Connecting part; 111. Connecting hole; 12. Support column; 121. Thread; 13. Fixing ring; 131. First lifting ring; 2. Support component; 21. Support surface; 22. Second lifting ring; 3. Fixing component; 31. Mating protrusion; 32. Clearance groove; 33. Limiting component; 34. Outer ring handle; 35. Contouring surface; 4. Elastic component; 5. Conformal tooling; 51. Ball head; 6. Fairing assembly; 61. First positioning hole; 7. Lifting positioner. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0032] like Figures 1-6 As shown, this embodiment provides an auxiliary support connector, which includes a connector body 1, a support member 2, and a fixing member 3. The connector body 1 includes a connecting part 11, which can be connected to a mounting surface; the support member 2 is connected to the connector body 1 through an elastic member 4, which can provide an upward elastic force to the support member 2, and the upper surface of the support member 2 is a support surface 21; the fixing member 3 is movably connected to the connector body 1 in the vertical direction, and the fixing member 3 is used to fix or unfix the support member 2, and the fixing member 3 can fix the support member 2 at different heights.

[0033] Specifically, in this embodiment, the connecting part 11 can fix the auxiliary support joint as a whole to the mounting surface, ensuring that the auxiliary support joint remains stationary with the mounting surface when subjected to external force. The mounting surface can be the upper surface of a tooling fixture with a lifting function. The support member 2 and the joint body 1 are connected by an elastic member 4, which provides an upward elastic force to the support member 2. The supporting surface 21 of the support member 2 provides an upward supporting force to the part to be supported. Therefore, the upward elastic force generated by the elastic member 4 can act on the part to be supported through the support member 2, facilitating the operator to move the part to be supported with the assistance of external force. When the fixing member 3 releases the support member 2, it enables the support member 2 to activate its floating function under the action of the elastic member 4. The support member 2 can move together with the part to be supported while providing support force, facilitating the movement of the part to be supported to the appropriate position for installation. After the support member 2 is installed, the fixing member 3 adjusts to an appropriate height and fixes the support member 2, resulting in better support performance.

[0034] Furthermore, in this embodiment, the aforementioned auxiliary support joint is used to install the aircraft wing fairing assembly 6. During installation, the fairing assembly also includes a conformal fixture 5. The auxiliary support joint can abut against the ball head 51 of the conformal fixture 5 via the support member 2, and by providing support force to the ball head 51, the fairing assembly 6 as a whole receives an upward support force. This facilitates the operator to apply manual force to move the fairing assembly 6, thereby aligning the first positioning hole 61 on the fairing assembly 6 with the second positioning hole on the fuselage to complete the subsequent installation. This avoids improper deformation of the fairing assembly 6 due to forced fit, which could affect the function of the fairing assembly 6.

[0035] Specifically, in this embodiment, the connector body 1 includes multiple parallel support columns 12. The circumferential surface of each support column 12 is provided with threads 121, and the fixing member 3 is connected to the threads 121. The multiple support columns 12 together form a receiving space, within which the supporting member 2 is located. Threads 121 are formed on the inner wall of each support column 12 near the receiving space, and the threads 121 on the multiple support columns 12 together form a threaded structure with gaps. The threaded connection between the fixing member 3 and the support columns 12 allows the fixing member 3 to finely adjust its height position by rotation, thereby fixing the supporting member 2 at an appropriate height to provide stable support for the member to be supported. Furthermore, the threaded connection allows the fixing member 3 to have a better fixing effect; pressure in the vertical direction will not directly cause displacement of the fixing member 3, thus avoiding functional loss at the fixing member 3.

[0036] In some other embodiments, the fastener 3 can also be slidably connected to the support column 12. The fastener 3 is provided with a snap-fit ​​component, which can snap itself to different heights of the support column 12, thereby enabling or disabling the floating function of the support 2.

[0037] Furthermore, in this embodiment, the fixing member 3 is provided with multiple mating protrusions 31, which are spaced apart and used to connect with the thread 121. The fixing member 3 and the support column 12 are connected through the mating protrusions 31 and the thread 121. The mating protrusions 31 are arranged around the fixing member 3. When the fixing member 3 rotates, the mating protrusions 31 and the thread 121 rotate relative to each other, thereby causing the fixing member 3 to rise or fall. It can be understood that the gap between the spaced mating protrusions 31 is a clearance groove 32, and the diameter of the clearance groove 32 is larger than the diameter of the support column 12. When the fixing member 3 rotates to a certain angle, the clearance groove 32 corresponds to the position of the support column 12. At this time, the mating protrusions 31 separate from the thread 121, and the operator can directly move the fixing member 3 to make the fixing member 3 rise or fall quickly in the vertical direction. The rapid descent of the fixing member 3 allows the support member 2 to quickly separate from the fixing member 3, enabling the support member 2 to activate its floating function; the rapid ascent of the fixing member 3 allows the fixing member 3 to quickly abut and fix itself to the support member 2, disabling the floating function of the support member 2 and facilitating a more stable support effect for the support member 2.

[0038] Furthermore, in this embodiment, the fixing member 3 is also provided with a limiting member 33, which is disposed on the mating protrusion 31 and can abut against the support column 12 for limiting. It is understood that without the limiting member 33, the height of the fixing member 3 can be adjusted within a certain range by screwing on the fixing member 3. However, if the rotation angle is too large, the mating protrusion 31 will separate from the thread 121. After separation, the support column 12 will be located in the relief groove 32 and thus unable to provide support to the fixing member 3. In actual use, this can easily lead to operator error, causing the fixing member 3 to rotate excessively and fall downwards, thereby affecting the supporting function of the support member 2. By providing the limiting member 33 at the mating protrusion 31, the limiting member 33 can abut against the support column 12 after the fixing member 3 rotates a certain angle, preventing the fixing member 3 from falling due to excessive rotation and disengagement from the support column 12. Specifically, the limiting member 33 is located at one end of the mating protrusion 31, meaning that between two adjacent limiting members 33, there is a mating protrusion 31 and a clearance groove 32. After the fixing member 3 is raised and lowered quickly, the operator only needs to rotate it in one direction to adjust the height of the fixing member 3 without causing it to fall. Furthermore, the limiting member 33 is provided with an arc-shaped joint, which matches the shape of the support column 12. When it abuts against the support column 12, it can make the force between the two more sufficient and even, avoiding structural damage caused by stress concentration. In some other embodiments, the limiting member 33 can also be located in the middle of the mating protrusion 31, in which case between two adjacent limiting members 33, there is a mating protrusion 31, a clearance groove 32, and a mating protrusion 31 at the other end. After using the clearance groove 32 in the middle position for rapid lifting and lowering, the operator can select one of the two mating protrusions 31 on both sides to connect with the thread 121 according to actual needs. Using different mating protrusions 31 for unidirectional screwing can make the fixing part 3 produce different movement directions, which is convenient for fine adjustment of the position of the fixing part 3 to rise or fall.

[0039] Furthermore, in this embodiment, the number of support columns 12, mating protrusions 31, and limiting members 33 are the same and correspond one-to-one. There are four support columns 12, evenly arranged in a ring; the mating protrusions 31 have four segments, evenly arranged in a ring on the fixing member 3; and four limiting members 33 are respectively disposed at one end of each mating protrusion 31. This structure ensures a tight and evenly distributed connection between the fixing member 3 and the connector body 1. The four mating protrusions 31 ensure that the fixing member 3 is subjected to force evenly in the circumference, preventing excessive torque that could damage its structure. The four limiting members 33 prevent stress concentration and structural damage when the fixing member 3 rotates and collides with the support columns 12. In some other embodiments, the number and arrangement of support columns 12, mating protrusions 31, and limiting members 33 can be different; this embodiment does not limit this.

[0040] Furthermore, in this embodiment, the fixing member 3 is also provided with an outer ring handle portion 34, and the limiting member 33 extends out of the support column 12. The outer ring handle portion 34 is connected to the limiting member 33 and surrounds the support column 12. That is, the fixing member 3 can be divided into an inner ring and an outer ring. The protrusion 31 is provided on the outer circumferential surface of the inner ring, and the outer ring is connected to the inner ring through the limiting member 33 and surrounds the support column 12. When the operator operates the fixing member 3, he / she can directly grasp the outer ring handle portion 34 to exert force, thereby driving the fixing member 3 to rotate as a whole. The setting of the outer ring handle portion 34 frees the operator from spatial interference from the support column 12, making it convenient to exert force to operate the fixing member 3. In some other embodiments, the outer ring handle portion may not be provided, and instead, one or more handles extending out of the support column 12 may be provided directly on the limiting member 33. This embodiment does not limit this.

[0041] Specifically, in this embodiment, a fixing ring 13 is provided on the top of the fixing member 3, and the elastic member 4 is an elastic connecting rope. Multiple elastic connecting ropes are looped between the fixing ring 13 and the circumferential surface of the support member 2. Multiple first lifting rings 131 are provided on the inner side of the fixing ring 13, and multiple second lifting rings 22 are provided on the outer circumferential surface of the support member 2. The two ends of the elastic connecting rope are respectively connected to the first lifting rings 131 and the second lifting rings 22. When the support member 2 needs to achieve a floating function, the elastic connecting ropes arranged in the above manner can provide elasticity while avoiding the ball head 51. When the ball head 51 is pressed down, it will not affect the function of the elastic connecting ropes, thereby providing support force to the fairing assembly 6 to facilitate position adjustment by the operator. At the same time, multiple evenly arranged elastic connecting ropes ensure that the circumferential force on the support member 2 is uniform, avoiding the support member 2 tilting due to uneven force, which would affect its support effect on the ball head 51. In addition, the elastic connecting ropes have good flexibility, and when the fairing assembly 6 is aligned with the positioning hole, the elastic connecting ropes will not cause significant obstruction to the fairing assembly 6 due to their own structure. It is understood that the number, arrangement, and specific materials of the elastic connecting ropes can be set according to the actual situation, and this embodiment does not limit them. In some other embodiments, the elastic element 4 can also be a spring or other elastic element disposed between the bottom of the connector body 1 and the support 2, and this embodiment does not limit it.

[0042] Specifically, in this embodiment, the connecting part 11 is disposed at the bottom of the connector body 1, and the connecting part 11 includes a connecting hole 111, which is used to fix the connecting part 11 to the mounting surface. The connecting part 11 is used to connect with the lifting positioner 7, which can drive the fairing assembly 6 to move closer to or further away from the aircraft body. Since the external force on the auxiliary support connector is the pressure generated in the vertical direction at the ball head 51, placing the connecting part 11 at the bottom of the connector body 1 makes the stress generated at the connecting part 11 a radial force, which is more stable than the tangential force generated at the connecting part 11. In addition, the connecting hole 111 is disposed on the side of the connecting part 11, and the connector body 1 can be fixed to the lifting positioner 7 by means of fastening with the fastener 3 or screw thread 121, so as to prevent the connector body 1 from detaching from the lifting positioner 7 when subjected to slight external force.

[0043] Specifically, in this embodiment, the support member 2 includes a hemispherical support shell, with a concave surface at the top of the support shell serving as a support surface 21. The support surface 21 is a conical surface used to provide support force to the ball head. The support member 2 is a ball head support member, including a conical ball head support surface. When the ball head 51 is pressed down, the ball head support surface acts as a guide, facilitating the ball head 51 to extend into and be fixed within the ball head support surface, thus providing good support for the ball head. Simultaneously, the bottom of the support member 2 is a hemispherical convex surface. During the process of the fixing member 3 lifting and fixing the support member 2, the hemispherical surface makes the contact process between the two smoother, avoiding collisions or vibrations of the support member 2 due to sharp edges, thereby ensuring the support effect on the ball head 51.

[0044] Furthermore, in this embodiment, the upper surface of the fixing member 3 is provided with a contoured surface 35, which matches the shape of the protruding surface of the support shell. The contoured surface 35 is used to fix the support shell. The contoured surface 35 can better engage with the support member 2, the contact process is smoother and avoids bumps, and it can also provide a good fixing and locking effect for the support member 2 when the floating function of the support member 2 is disabled. In some other embodiments, the upper surface of the fixing member 3 may not have a contoured surface 35, but instead be set as an elastic abutment surface. It is understood that when the first positioning hole 61 on the fairing assembly 6 is aligned with the second positioning hole on the fuselage, the fairing assembly 6 may cause the support member 2 to move horizontally, thereby affecting the engagement effect between the support member 2 and the contoured surface 35. Therefore, setting the upper surface as an elastic abutment surface can ensure that no matter how the support member 2 moves, the elastic abutment surface can undergo elastic deformation upon contact to wrap the bottom of the support member 2, thereby producing a better engagement and fixing effect.

[0045] Specifically, the working steps of the auxiliary support joint provided in this embodiment are as follows:

[0046] S1: Disable the floating function of the auxiliary support joint, and connect the fairing assembly 6 to the lifting positioner 7 through the auxiliary support joint. The lifting positioner 7 drives the fairing assembly 6 to the installation position for initial positioning.

[0047] S2: Activate the floating function of the present invention. With the help of the floating function of the auxiliary support joint, the operator adjusts the installation position by directly applying manual force to the fairing assembly 6 to achieve the final alignment of the positioning hole, and then disables the floating function of the auxiliary support joint.

[0048] Specifically, S1 disabling the floating function allows the auxiliary support joint to have sufficient structural strength to stably support the fairing assembly 6, making it easier for the lifting positioner 7 to move the fairing assembly 6; S2 activating the floating function allows the support member 2 and the fairing assembly 6 to have sufficient freedom of movement, and the fairing assembly 6 is subjected to a certain supporting force to facilitate the operator to move the fairing assembly 6.

[0049] Furthermore, the detailed operational procedures for the above steps are as follows:

[0050] In the first step, the auxiliary support joint is connected to the lifting positioner 7 through the connecting part 11. The ball head 51 of the fairing assembly 6 with the conformal tooling 5 contacts the support surface 21 on the support member 2. The elastic connecting rope elongates due to the force, causing the support member 2 to move to a certain displacement and eventually come to rest.

[0051] The second step is to quickly move the fixing part 3 to a position close to the support part 2 by using the clearance groove 32 in the fixing part 3. The operator can rotate the fixing part 3 by holding the outer ring handle 34 to make the fixing part 3 move up and down slightly, so that its contour surface 35 engages and fixes with the bottom of the support part 2. At the same time, the limiting part 33 in the fixing part 3 can prevent the support from failing due to excessive rotation.

[0052] The third step is to use the second positioning hole on the aircraft fuselage as a reference, and use the lifting positioning device 7 to initially position the fairing assembly 6 so that the first positioning hole 61 on the fairing assembly 6 is roughly aligned with the corresponding second positioning hole on the aircraft. Then, slowly rotate the fixing part 3 so that the support part 2 can slowly get free from the constraint of the fixing part 3 and obtain the floating function.

[0053] Fourth, with the help of the floating function of the above-mentioned auxiliary support joint, the assembly operator can adjust the position of the fairing assembly 6 by directly applying manual force to the fairing assembly 6 to achieve the final alignment of the positioning holes and complete the final positioning. Then, the position of the fastener 3 is adjusted again to achieve the fixed support of the ball head 51 support 2. After that, the fairing assembly 6 can be installed by passing screws or other fixing parts through the aligned positioning holes.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An auxiliary support joint, characterized in that, include: The connector body (1) includes a connecting part (11) which can be connected to the mounting surface; Support member (2), the support member (2) is connected to the connector body (1) through elastic member (4), the elastic member (4) can provide an upward elastic force to the support member (2), and the upper surface of the support member (2) is a support surface (21); The fastener (3) is movably connected to the connector body (1) in the vertical direction. The fastener (3) is used to fix or unfix the support (2), and the fastener (3) can fix the support (2) at different heights.

2. The auxiliary support joint according to claim 1, characterized in that, The connector body (1) includes a plurality of parallel support columns (12), and the circumferential surface of the support column (12) is provided with a thread (121), and the fastener (3) is connected to the thread (121).

3. The auxiliary support joint according to claim 2, characterized in that, The fastener (3) is provided with a plurality of mating protrusions (31), which are spaced apart and are used to engage with the thread (121).

4. The auxiliary support joint according to claim 3, characterized in that, The fixing member (3) is also provided with a limiting member (33), which is provided on the mating protrusion (31) and can abut against the support column (12) for limiting.

5. The auxiliary support joint according to claim 4, characterized in that, The number of the support column (12), the mating protrusion (31), and the limiting member (33) are the same and they correspond one-to-one.

6. The auxiliary support joint according to claim 5, characterized in that, The fixing member (3) is also provided with an outer ring handle (34), the limiting member (33) extends out of the support column (12), and the outer ring handle (34) is connected to the limiting member (33) and surrounds the support column (12).

7. The auxiliary support joint according to claim 1, characterized in that, The top of the fixing member (3) is provided with a fixing ring (13), and the elastic member (4) is an elastic connecting rope. Multiple elastic connecting ropes are looped between the fixing ring (13) and the circumferential surface of the support member (2).

8. The auxiliary support joint according to claim 1, characterized in that, The connecting part (11) is disposed at the bottom of the connector body (1), and the connecting part (11) includes a connecting hole (111) for fixing the connecting part (11) to the mounting surface.

9. The auxiliary support joint according to claim 1, characterized in that, The support member (2) includes a hemispherical support shell, the concave surface at the top of the support shell is a support surface (21), the support surface (21) is a conical surface, and the conical surface is used to provide support force to the ball head (5).

10. The auxiliary support joint according to claim 9, characterized in that, The upper surface of the fastener (3) is provided with a contoured surface (35), which matches the shape of the protruding surface of the support shell. The contoured surface (35) is used to fix the support shell.

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