A flange welding positioning device

Abstract

The utility model discloses a flange welding positioning device, aims at solving the problem of lacking positioning reference in the existing flange welding process, influencing the mechanical strength and stability of overall structure. The device of the utility model includes: the central shaft, first positioning piece and fastening assembly, the central shaft passes through the opening of equipment body, the first positioning piece is set on the central shaft, the first positioning piece is adapted with the center reserved hole of flange, the fastening assembly is detachably connected with the central shaft, and the fastening assembly is abutted with the first positioning piece. Through the coaxial cooperation of the central shaft, the first positioning piece and the opening of equipment body, the center hole of flange and the opening of equipment body can be aligned, and the offset problem of traditional welding is avoided. No matter how the size of flange and equipment body is, as long as the hole type of the first positioning piece and the center reserved hole of flange is matched, high-precision center alignment can be realized, and the coaxiality of subsequent assembly is provided.

Description

Technical Field

[0001] This utility model relates to the field of welding tooling technology in mechanical manufacturing, and in particular to a flange welding positioning device. Background Technology

[0002] In the fields of petrochemicals, pressure vessels, and pipeline engineering, it is often necessary to weld flanges with a central circular hole to the body of equipment or pipelines. The traditional welding method usually involves creating a circular hole in the body, the diameter of which is slightly larger than the diameter of the flange's central hole, so that a right-angle bevel of approximately 90° can be formed during welding, using fillet welds to enhance the mechanical strength of the weld.

[0003] However, this traditional method suffers from a lack of effective positioning references, making it highly susceptible to misalignment between the flange's center axis and the body's opening center axis during welding. This misalignment causes the components ultimately installed on the flange to experience additional assembly stresses, severely weakening the mechanical strength, sealing performance, and vibration fatigue resistance of the entire connection structure, posing a safety hazard. Utility Model Content

[0004] (a) Purpose of the utility model The purpose of this invention is to provide a flange welding positioning device, which aims to solve the problems of lack of positioning reference in the existing flange welding process, resulting in inaccurate flange alignment, and the components installed on the flange bearing assembly internal stress, affecting the mechanical strength and stability of the overall structure.

[0005] (II) Technical Solution To solve the above problems, this utility model provides a flange welding positioning device, including a central shaft, a first positioning element, and a fastening assembly; The central shaft passes through the opening in the equipment body, the first positioning member is sleeved on the central shaft, the first positioning member is adapted to the center reserved hole of the flange, the fastening assembly is detachably connected to the central shaft, and the fastening assembly abuts against the first positioning member.

[0006] Preferably, the diameter of the central shaft is adapted to the opening of the equipment body, the diameter of the central reserved hole of the flange is larger than the opening of the equipment body, and the first positioning member abuts against the equipment body through the fastening assembly.

[0007] Preferably, the fastening assembly includes a fastening nut, and the central shaft is provided with an external thread, the fastening nut being connected to the central shaft through the external thread.

[0008] Preferably, the fastening assembly includes two fastening nuts, and the external thread includes two external thread sections disposed on both sides of the first positioning member, and the two fastening nuts are respectively connected to the two external thread sections.

[0009] Preferably, the two external threaded sections are respectively close to the side wall of the first positioning member and the side wall of the equipment body, the first positioning member abuts against the side wall of the equipment body, and the two fastening nuts abut against the side wall of the first positioning member and the side wall of the equipment body, respectively.

[0010] Preferably, the device further includes a second positioning member, which is sleeved on the central shaft, the opening of the device body is adapted to the second positioning member, and the fastening component abuts against the second positioning member.

[0011] Preferably, the first positioning member and the second positioning member are integrally formed, or the first positioning member and the second positioning member are abutted and fixed by the fastening assembly.

[0012] Preferably, the diameter of the first positioning member is smaller than the diameter of the second positioning member, and the outer contour of the first positioning member is perpendicular to the side of the second positioning member.

[0013] Preferably, the fastening assembly includes two fastening nuts, and the central shaft is provided with two external threaded sections that mate with the fastening nuts. The two external threaded sections are respectively located on one side of the first positioning member and one side of the second positioning member.

[0014] Preferably, the first positioning member and the second positioning member are disc-shaped structures.

[0015] (III) Beneficial Effects The above-mentioned technical solution of this utility model has the following beneficial technical effects: 1. By coaxially engaging the central shaft and the first positioning component with the opening in the equipment body and the pre-drilled center hole in the flange, the alignment of the center hole in the flange with the opening in the equipment body can be ensured, avoiding the misalignment problem of traditional welding. Regardless of the dimensions of the flange and the equipment body, as long as the hole type of the first positioning component matches the pre-drilled center hole in the flange, high-precision center alignment can be achieved, providing a basis for coaxiality in subsequent assembly.

[0016] 2. The design employs a central shaft that interlocks with the equipment body through a pre-drilled hole. The first positioning component is sleeved onto the central shaft and detachably connected to it via a fastening assembly. This fixes the relative position of the first positioning component and the central shaft, thus achieving basic positioning of the flange and the equipment body. Assembly requires only sequential steps, eliminating the need for complex tooling or multi-step adjustments. In on-site operations, workers can quickly complete the insertion of the central shaft, installation of the first positioning component, and tightening of the fastening assembly, significantly reducing preparation time and improving the efficiency of flange positioning and welding.

[0017] 3. All components are detachable. By replacing the appropriate central shaft or first positioning component, it can be adapted to flanges and equipment bodies of different specifications without the need to redesign tooling, achieving component universality and reducing costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a flange welding positioning device according to the first embodiment of the present utility model; Figure 2 This is a front view of a flange welding positioning device according to the first embodiment of the present utility model; Figure 3 yes Figure 2 Schematic diagram of the cross section of AA; Figure 4 This is a schematic diagram of the overall structure of a flange welding positioning device according to the second embodiment of the present utility model; Figure 5 This is a front view of a flange welding positioning device according to the second embodiment of the present utility model; Figure 6 yes Figure 5 A schematic diagram of the cross-section of BB.

[0019] Figure label: 1. Central shaft; 1a. External thread section; 2. First positioning component; 3. Fastening components; 31. Fastening nuts; 4. Second positioning component. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0021] The accompanying drawings show schematic diagrams of layer structures according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0022] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Example 1 Combination Figures 1 to 3 This utility model provides a flange welding positioning device, including a central shaft 1, a first positioning element 2, and a fastening assembly 3; the central shaft 1 passes through the opening of the equipment body, the first positioning element 2 is sleeved on the central shaft 1, the first positioning element 2 is adapted to the center reserved hole of the flange, the fastening assembly 3 is detachably connected to the central shaft 1, and the fastening assembly 3 abuts against the first positioning element 2.

[0025] Specifically, the central shaft 1 serves as the core carrier, passing through an opening in the equipment body to provide an installation reference. The first positioning component 2 is fitted onto the central shaft 1 and mates with the pre-drilled hole in the center of the flange to position the flange. The fastening assembly 3 is detachably connected to the central shaft 1 and abuts against the first positioning component 2 to achieve locking. After the central shaft 1 passes through the opening in the equipment body, the first positioning component 2 is fitted onto and mates with the pre-drilled hole in the center of the flange to position the flange. The fastening assembly 3 is connected to the central shaft 1 and abuts against the first positioning component 2, fixing the relative position of the flange and the equipment body, providing a precise reference for welding.

[0026] With this setup, the central shaft 1 and the first positioning component 2 are coaxially fitted with the opening in the equipment body and the center pre-drilled hole in the flange, respectively. This ensures that the center hole of the flange is aligned with the opening in the equipment body, avoiding the misalignment problem of traditional welding. Regardless of the dimensions of the flange and the equipment body, as long as the hole type of the first positioning component 2 matches the center pre-drilled hole in the flange, high-precision center alignment can be achieved, providing a foundation for coaxiality in subsequent assembly. By inserting the central shaft 1 into the opening in the equipment body and sleeve-connecting the first positioning component 2 to the central shaft 1, and detachably connecting it to the central shaft 1 via the fastening assembly 3, the relative positions of the first positioning component 2 and the central shaft 1 are fixed, thereby achieving basic positioning of the flange and the equipment body. During assembly, only sequential operations are required, eliminating the need for complex tooling or multi-step adjustments. In on-site operations, workers can quickly complete the insertion of the central shaft 1, the installation of the first positioning component 2, and the locking of the fastening assembly 3, significantly shortening preparation time and improving the efficiency of flange positioning and welding. Each component is detachable. By replacing the appropriate central shaft 1 or the first positioning component 2, it can be adapted to flanges and equipment bodies of different specifications without the need to redesign tooling, thus achieving component universality and reducing costs.

[0027] It should be noted that the specific location where the relative position of the central shaft 1 and the equipment body is achieved is not limited here. For radial positioning of the central shaft 1, the diameter of the central shaft 1 can be directly adapted to the opening diameter of the equipment body, or a limiting protrusion can be fixedly installed on the central shaft 1, with the outer diameter of the limiting protrusion adapted to the opening diameter of the equipment body. Here, "adaptation" refers to the fact that after the device is installed, the circumference of the central shaft 1 or the circumference of the limiting protrusion abuts against the inner side of the opening in the equipment body, thereby achieving radial positioning of the central shaft 1. In a preferred embodiment, the diameter of the central shaft 1 is adapted to the opening in the equipment body, the diameter of the central pre-drilled hole in the flange is larger than the opening in the equipment body, and the first positioning member 2 abuts against the equipment body through the fastening assembly 3.

[0028] Specifically, the diameter of the central shaft 1 is adapted to the opening in the equipment body, enhancing its radial positioning; the diameter of the pre-drilled hole in the center of the flange is larger, providing installation space for the first positioning component 2; the fastening assembly 3 indirectly makes the first positioning component 2 abut against the equipment body by abutting against the first positioning component 2, thus fixing its axial position. After the device is installed, the central shaft 1 achieves radial positioning by adapting to the opening in the equipment body. After the first positioning component 2 is fitted, the fastening assembly 3 abuts against the first positioning component 2, making it contact the end face of the equipment body, thereby fixing the axial position of the flange and the equipment body and ensuring a good fit during welding.

[0029] With this setup, the central shaft 1 achieves radial positioning and provides an axial reference for the first positioning element 2. The first positioning element 2 positions the flange and is axially fixed by abutting against the equipment body through the fastening assembly 3. This multi-dimensional constraint restricts the relative displacement of the positioning device, the equipment body, and the flange from both radial and axial dimensions. During welding, under thermal stress or external force, the dual constraint prevents radial displacement or axial movement of the flange, ensuring weld uniformity and structural strength. With the central shaft 1 directly passing through the opening in the equipment body, the diameter of the pre-drilled hole in the center of the flange is larger, providing space for the structural design of the first positioning element 2. The first positioning element 2 can be designed as a multi-layered disc with steps, with discs of different diameters adapting to different flange models, improving the versatility of the positioning device. In addition, the fastening assembly 3 ensures that the first positioning element 2 abuts against the equipment body, guaranteeing a tight fit between the flange and the welding surface of the equipment body, avoiding gaps, ensuring weld quality, preventing gap expansion due to thermal deformation, ensuring effective stress transfer in the weld, and improving load-bearing capacity.

[0030] It should be noted that the specific method of detachably connecting the fastening assembly 3 and the central shaft 1 is not limited here. It can be achieved by snap-fit ​​or screw-fit, as long as the relative position of the fastening assembly 3 and the central shaft 1 is fixed, ensuring the stability of the first positioning element 2 during flange positioning. In a preferred embodiment, the fastening assembly 3 includes a fastening nut 31, and the central shaft 1 has external threads, with the fastening nut 31 connected to the central shaft 1 via these external threads.

[0031] Specifically, the external thread of the central shaft 1 provides a connection base for the fastening nut 31, and axial movement and locking are achieved through threaded engagement. After the first positioning piece 2 is sleeved on the central shaft 1, the fastening nut 31 is screwed in, and the self-locking force of the thread and axial pressure are used to lock the first positioning piece 2 in the designated position of the central shaft 1 to prevent axial movement.

[0032] With this configuration, the threaded connection exhibits excellent self-locking properties. Combined with appropriate tightening torque, it provides a stable and continuous axial locking force, preventing loosening under welding vibration or thermal stress. This ensures that the first positioning element 2 remains fixed throughout the entire process, providing stable support for flange positioning. The external threaded connection allows for continuous axial adjustment of the fastening nut 31, meeting diverse welding process requirements and enhancing tooling flexibility.

[0033] It should be noted that the specific number of fastening nuts 31 and the specific arrangement of the external threads on the central shaft 1 are not limited here. Under the condition of meeting the positioning requirements during flange welding, the first positioning member 2 can be fixed to the side of the equipment body by a single fastening nut 31 located near the flange. In this case, the external thread is only provided on one side of the first positioning member 2, that is, on the central shaft 1 near the flange welding installation. In a preferred embodiment, the fastening assembly 3 includes two fastening nuts 31, and the external thread includes two external thread sections 1a located on both sides of the first positioning member 2. The two fastening nuts 31 are respectively connected to the two external thread sections 1a.

[0034] Specifically, the two fastening nuts 31 engage with the two external threaded sections 1a on the central shaft 1, doubly locking them from both sides of the first positioning member 2 to fix their axial position. At this time, the two external threaded sections 1a are symmetrically arranged on both sides of the first positioning member 2. After the fastening nuts 31 near the equipment body abut against the equipment body, the equipment body can also achieve axial positioning with the central shaft 1 in other ways, such as by screwing or snapping the central shaft 1 with the equipment body through other structures.

[0035] In a preferred embodiment, taking the flange installed on the outside of the equipment body as an example, the two external threaded sections 1a are respectively close to the first positioning member 2 and the inner wall of the equipment body. The first positioning member 2 abuts against the outer wall of the equipment body. One of the two fastening nuts 31 abuts against the first positioning member 2, and the other fastening nut 31 abuts against the inner wall of the equipment body. Here, the inner wall specifically refers to the back side of the abutment surface between the first positioning member 2 and the equipment body. Through the two fastening nuts 31, the first positioning member 2 and the equipment body are reliably connected, so that the first positioning member 2 and the equipment body are positioned along the axial direction of the central shaft 1, and then radial positioning is achieved through the opening between the central shaft 1 and the equipment body.

[0036] With this setup, the locating element is clamped by nuts on both sides, precisely defining its axial position. This ensures the axial relative position accuracy between the flange and the equipment body, guaranteeing the flatness and perpendicularity of the flange end face after welding. The structure of two external threaded sections 1a and two fastening nuts 31 allows for initial placement of the locating element during assembly, followed by fine-tuning and tightening. During disassembly, loosening and removing the single-sided locking nut allows for the removal of the first locating element 2. This design is suitable for scenarios requiring frequent changes or adjustments to the locating position, eliminating the need for complete nut removal and improving efficiency.

[0037] Furthermore, the two fastening nuts 31 are preferably positioned on both sides of the first positioning component 2 and the equipment body to simultaneously fix the axial position of the first positioning component 2 and the equipment body. During welding, this avoids positioning failure due to the movement of a single component, further ensuring accurate welding position. During device installation, the fastening nuts 31 on both sides, in conjunction with the central shaft 1, achieve axial and radial positioning of the first positioning component 2 and the equipment body during tightening. This eliminates the need for additional tooling to fix the equipment body, simplifies pre-welding preparation procedures, and further improves work efficiency.

[0038] Example 2 Combination Figures 4 to 6 This utility model provides a flange welding positioning device, including a central shaft 1, a first positioning element 2, and a fastening assembly 3. The central shaft 1 passes through an opening in the device body, the first positioning element 2 is sleeved on the central shaft 1, and the first positioning element 2 is adapted to the center reserved hole of the flange. The fastening assembly 3 is detachably connected to the central shaft 1 and abuts against the first positioning element 2. The device also includes a second positioning element 4, which is sleeved on the central shaft 1, the opening in the device body is adapted to the second positioning element 4, and the fastening assembly 3 abuts against the second positioning element 4.

[0039] Specifically, the central shaft 1, the first positioning element 2, and the fastening assembly 3 have the same function and principle as described above, and will not be repeated here. The second positioning element 4 is fitted onto the central shaft 1 and adapted to the opening in the equipment body to position the equipment body; the fastening assembly 3 abuts against the second positioning element 4 to lock and fix the equipment body, assisting in axial positioning. The central shaft 1 passes through the opening in the equipment body, and the second positioning element 4 is fitted onto and adapted to the opening to position the equipment body; the first positioning element 2 is fitted onto and adapted to the center hole of the flange; the fastening assembly 3 abuts against the first positioning element 2 and the second positioning element 4 to lock them, ultimately achieving precise relative positioning between the flange and the equipment body.

[0040] By adding a second positioning component 4 to the first positioning component 2, the positioning area of ​​the equipment body is increased, the positioning stability is improved, and there is ample installation space during the installation process. The first positioning component 2 positions the flange, and the second positioning component 4 positions the equipment body. Both are fitted with a central shaft 1, and the positions of the first positioning component 2 and the second positioning component 4 relative to the central shaft 1 are fixed by the fastening assembly 3. This ensures the coaxiality of the equipment body and the flange, and achieves precise alignment between the center reserved hole of the flange and the center of the opening of the equipment body.

[0041] It should be noted that the specific structural relationship between the first positioning element 2 and the second positioning element 4 is not limited here. They can be separate structures or integrated structures. The first positioning element 2 and the second positioning element 4 can be selected with different structural forms according to the flange welding installation and specific usage scenarios.

[0042] When the first positioning component 2 and the second positioning component 4 are integrally molded, they form a single structure. After being fitted onto the central shaft 1, they are simultaneously fixed by the fastening assembly 3. The integral molding process eliminates connection gaps, resulting in high structural strength and the ability to stably withstand welding stresses, such as thermal and mechanical stresses. This integral molding is suitable for standardized, high-stability batch welding. It can also be designed as an integral disc with reinforcing ribs, suitable for welding scenarios with high loads, such as high-pressure pipeline flanges, and exhibits strong resistance to deformation.

[0043] When the first positioning component 2 and the second positioning component 4 are separate structures, they are independent parts. After being fitted onto the central shaft 1, they are secured together by the fastening assembly 3 to form a coordinating positioning unit. They can be machined and replaced separately, and their relative positions can be finely adjusted by the fastening assembly 3. When welding flanges of different thicknesses, only the first positioning component 2 needs to be replaced, improving versatility. The abutment and fixing mechanism is suitable for non-standardized, multi-specification, small-batch welding, improving the efficiency of welding positioning.

[0044] In a preferred embodiment, the diameter of the first positioning member 2 is smaller than the diameter of the second positioning member 4, and the outer contour of the first positioning member 2 is perpendicular to the side of the second positioning member 4.

[0045] Specifically, the diameter of the first positioning element 2 is smaller than that of the second positioning element 4, and its outer contour is perpendicular to the side of the second positioning element 4, forming a stepped or vertical mating structure. This facilitates mating with the flange center hole, the equipment body opening, and the end face, respectively. It is suitable for scenarios where the diameter of the flange center reserved hole is smaller than that of the equipment body opening. In this scenario, the periphery of the equipment body opening is perpendicular to the side of the flange near the equipment body. After the flange is welded and fixed to the equipment body on the outer periphery, the flange and the equipment body can also be welded on the periphery of the equipment body opening, which improves the welding strength between the flange and the equipment body. At this time, the welding position is distributed along the outer periphery of the flange center reserved hole and does not affect the structure of the flange center reserved hole.

[0046] In a preferred embodiment, the fastening assembly 3 includes two fastening nuts 31, and the central shaft 1 is provided with two external thread sections 1a that cooperate with the fastening nuts 31. The two external thread sections 1a are located on one side of the first positioning member 2 and one side of the second positioning member 4, respectively.

[0047] Specifically, two fastening nuts 31 engage with two external threads on the central shaft 1, axially locking them from both sides of the first positioning member 2 and the second positioning member 4, fixing their relative positions. When the flange and the equipment body are in contact, the two fastening nuts 31 are located on opposite sides of the flange and the equipment body, i.e., from the axial direction of the central shaft 1, they are, in sequence, one fastening nut 31, the first positioning member 2, the second positioning member 4, and the other fastening nut 31. The central shaft 1 has an external thread on each side of the first positioning member 2 and the second positioning member 4. After being fitted, the fastening nuts 31 are screwed into both sides, clamping and fixing them from both sides, restricting axial movement.

[0048] With this configuration, the two fastening nuts 31 respectively lock the first positioning element 2 and the second positioning element 4, simultaneously fixing the positioning reference of the flange and the equipment body, ensuring stable axial relative position. Even under uneven thermal stress during flange welding, the relative position of the flange and the equipment body remains stable, improving the dimensional accuracy and stability of the welded structure and the welding quality. The fastening nuts 31 are located outside the first positioning element 2 and the second positioning element 4, and their individual positions can be adjusted to regulate the axial distance between the two positioning elements. In cases involving flanges or equipment bodies of different thicknesses, an adjustment plate can be installed between the first positioning element 2 and the second positioning element 4 to improve the versatility of the device.

[0049] It should be noted that the specific shapes of the first positioning element 2 and the second positioning element 4 are not limited here. When the central reserved hole of the flange and the opening of the equipment body are circular, the first positioning element 2 and the second positioning element 4 are disc-shaped structures.

[0050] Specifically, the first positioning component 2 and the second positioning component 4 are disc-shaped, which facilitates a large-area fit with the pre-drilled hole in the center of the circular flange, the opening in the equipment body, and the end face, thereby improving positioning stability. The circumferential surface of the disc-shaped first positioning component 2 fits against the inner wall of the circular center hole of the flange to achieve radial positioning; the circumferential surface of the disc-shaped second positioning component 4 fits against the inner wall of the circular opening in the equipment body, and works with the central shaft 1 to achieve radial and axial positioning; the disc plane facilitates axial contact with the fastening assembly 3 or another positioning component.

[0051] With this setup, the disc shape matches the corresponding circular hole, forming a circumferential contact surface. This provides more uniform radial constraint, preventing radial misalignment or rotation of the flange and equipment body. It also avoids stress concentration affecting the welding effect during the welding process. When subjected to radial external forces during welding, such as collisions or knocking on the weld slag, the large-area contact disperses the external force, ensuring the positioning effect and improving the welding and installation quality of the flange.

[0052] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A flange welding positioning device, characterized in that, The device includes a central shaft (1), a first positioning element (2), and a fastening assembly (3); The central shaft (1) passes through the opening in the equipment body, the first positioning member (2) is sleeved on the central shaft (1), the first positioning member (2) is adapted to the center reserved hole of the flange, the fastening assembly (3) is detachably connected to the central shaft (1), and the fastening assembly (3) abuts against the first positioning member (2).

2. The apparatus according to claim 1, characterized in that, The diameter of the central shaft (1) is adapted to the opening of the equipment body, the diameter of the central reserved hole of the flange is larger than the opening of the equipment body, and the first positioning member (2) abuts against the equipment body through the fastening assembly (3).

3. The apparatus according to claim 2, characterized in that, The fastening assembly (3) includes a fastening nut (31), and the central shaft (1) is provided with an external thread. The fastening nut (31) is connected to the central shaft (1) through the external thread.

4. The apparatus according to claim 3, characterized in that, The fastening assembly (3) includes two fastening nuts (31), and the external thread includes two external thread sections (1a) disposed on both sides of the first positioning member (2). The two fastening nuts (31) are respectively connected to the two external thread sections (1a).

5. The apparatus according to claim 4, characterized in that, The two external threaded sections (1a) are respectively close to the first positioning member (2) and the side wall of the equipment body. The first positioning member (2) abuts against the side wall of the equipment body, and the two fastening nuts (31) abut against the first positioning member (2) and the side wall of the equipment body, respectively.

6. The apparatus according to claim 1, characterized in that, The device further includes a second positioning element (4), which is sleeved on the central shaft (1). The opening of the device body is adapted to the second positioning element (4), and the fastening component (3) abuts against the second positioning element (4).

7. The apparatus according to claim 6, characterized in that, The first positioning member (2) and the second positioning member (4) are integrally formed, or the first positioning member (2) and the second positioning member (4) are abutted and fixed by the fastening component (3).

8. The apparatus according to claim 7, characterized in that, The diameter of the first positioning member (2) is smaller than the diameter of the second positioning member (4), and the outer contour of the first positioning member (2) is perpendicular to the side of the second positioning member (4).

9. The apparatus according to claim 8, characterized in that, The fastening assembly (3) includes two fastening nuts (31), and the central shaft (1) is provided with two external thread sections (1a) that cooperate with the fastening nuts (31). The two external thread sections (1a) are located on one side of the first positioning member (2) and one side of the second positioning member (4), respectively.

10. The apparatus according to claim 9, characterized in that, The first positioning element (2) and the second positioning element (4) are disc-shaped structures.

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