A brazing fixture

Abstract

The utility model discloses a kind of brazing positioning fixtures, including the base with plane top surface, the middle part of the base is coaxially arranged with the positioning card slot for the end of the structure to be welded to locate and insert, the top surface outer edge of the base is provided with at least 3 side clamping components, each side clamping component is equidistantly distributed on the outside of the positioning card slot along circumference with the axis of the base as reference;The side clamping component includes the clamping support projected on the top surface of the base, further include locating arrangement in the clamping support top clamping nut and clamping bolt, the axis of the clamping nut is perpendicular to the axis of the base, the threaded end of the clamping bolt is coaxially inserted and is screw fitted to the clamping nut, so that the clamping bolt can reciprocate along the axial direction of the clamping nut, the light pole end of the clamping bolt can be in contact with the side outer wall of the structure to be welded.

Description

Technical Field

[0001] This utility model relates to the technical field of brazing process and its supporting equipment, and in particular to a brazing positioning fixture. Background Technology

[0002] In recent years, with the continuous improvement of the requirements for the processing accuracy of structural components in the field of advanced manufacturing, traditional welding processes are facing severe challenges. Among them, brazing is widely used in traditional processes and is often used to solve the connection and installation between components with relatively complex structures.

[0003] Generally, ensuring the welding dimensional accuracy of the structural components being processed, improving assembly efficiency and stability are important factors in determining the quality of product welding. In actual operation, matching fixtures and tooling are usually used to meet the pre-positioning of the corresponding components and structural support, so as to ensure the position and structural stability of these components during subsequent welding processing.

[0004] However, the fixtures and tooling currently used in the industry are mostly simple clamping components. Although they can clamp and position the structural parts to a certain extent, due to their own structural limitations, the clamping and positioning effect on some cylindrical or other special-shaped structural parts is not ideal. During subsequent brazing and other operations, structural deformation caused by high-temperature conditions can easily lead to loosening or even misalignment of these structural parts at the clamping position of the fixture, resulting in damage to the brazing surface and seriously affecting the welding effect of the structural parts, as well as the quality of the products.

[0005] In view of this, how to optimize the clamping and positioning effect of the welded structural components and ensure the structural stability and corresponding welding accuracy of the structural components during the brazing process is an important technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a brazing positioning fixture that can effectively optimize the clamping and positioning effect of the welded structural components, and ensure the structural stability and welding accuracy of the structural components during the brazing process.

[0007] To solve the above technical problems, this utility model provides a brazing positioning fixture, including a base with a flat top surface. A positioning groove is coaxially arranged in the middle of the base for the end of the structural component to be welded to be aligned and inserted. At least three side clamping components are provided on the outer edge of the top surface of the base. Each side clamping component is evenly distributed around the outside of the positioning groove along the circumferential direction with the axis of the base as a reference.

[0008] The side clamping assembly includes a clamping support protruding from the top surface of the base, and a clamping nut and a clamping bolt arranged on the top of the clamping support. The axis of the clamping nut is perpendicular to the axis of the base. The threaded end of the clamping bolt is coaxially inserted and threadedly adapted to the clamping nut so that the clamping bolt can reciprocate along the axial direction of the clamping nut. The smooth end of the clamping bolt can abut against the outer side wall of the welded structural member.

[0009] Preferably, a shaft clamping assembly is provided above the base, the shaft clamping assembly including a pressure plate arranged above the positioning slot, the bottom surface of the pressure plate being able to abut against the top of the welded structural component;

[0010] A clamping screw is coaxially arranged in the middle of the pressure plate, and a clamping sleeve is coaxially fixed in the middle of the base. The free end of the clamping screw is coaxially inserted and threaded to the clamping sleeve, and the assembly end of the clamping screw is axially linked with the pressure plate. A positioning gap is formed between the pressure plate and the positioning slot to accommodate the welded structural parts.

[0011] Preferably, the top surface of the base is provided with a positioning boss, the positioning slot is located on the top surface of the positioning boss, the positioning boss has an auxiliary positioning cavity inside, the clamping screw sleeve is located in the auxiliary positioning cavity, and the free end of the clamping screw passes through the positioning boss and extends into the auxiliary positioning cavity to be threadedly connected with the clamping screw sleeve.

[0012] Preferably, the clamping sleeve is fixed to the top inner wall of the auxiliary positioning cavity by fastening screws.

[0013] Preferably, the bottom end of the auxiliary positioning cavity has a heat dissipation port that penetrates the base, and the bottom surface of the base is provided with a heat dissipation rib plate. There are at least two heat dissipation rib plates, and each heat dissipation rib plate is evenly distributed around the outside of the heat dissipation port with a gap fit, taking the axis of the base as a reference.

[0014] Preferably, the bottom surface of the pressure plate is provided with a pre-positioning boss that can be adapted to the structural component being welded.

[0015] Preferably, the pressure plate is made of ceramic.

[0016] Preferably, the top of the clamping support has a side positioning cavity, the clamping nut is embedded in the side positioning cavity, and the outer wall of the clamping nut abuts against the inner wall of the side positioning cavity.

[0017] Preferably, the smooth end of the clamping bolt is coaxially provided with a graphite pin that can abut against the outer side wall of the welded structural component.

[0018] Preferably, both the clamping nut and the clamping bolt are ceramic components.

[0019] Compared to the aforementioned background technology, the brazing positioning fixture provided by this utility model, during operation, involves aligning one end of the structural component to be welded into the positioning slot and fully inserting it into place, thereby achieving reliable axial support and positioning of the structural component being processed. At this time, the structural component is located in the center of the top of the base, while the clamping components on each side are located on the periphery of the structural component, and the clamping bolts are not in contact with the structural component. Then, the clamping nut can be screwed on to utilize the threaded adaptation structure between the clamping nut and the clamping bolt, which drives the clamping bolt to move along its own axis toward the structural component until the smooth end of the clamping bolt contacts and reliably abuts against the side outer wall of the structural component. In this way, the clamping bolts evenly arranged in each circumference can form a side and circumferential locking and positioning of the structural component being welded. This achieves separate longitudinal and lateral locking and positioning of the structural components being processed. The positioning slots and clamping bolts work together to ensure reliable clamping of the structural components being welded, optimize the positioning effect of the structural components during the welding process, ensure the structural stability of the structural components during the subsequent brazing process, and improve the accuracy and efficiency of the brazing operation.

[0020] In another preferred embodiment of this utility model, a shaft clamping assembly is provided above the base. The shaft clamping assembly includes a pressure plate aligned above the positioning slot, the bottom surface of which abuts against the top of the component to be welded. A clamping screw is coaxially disposed in the middle of the pressure plate, and a clamping sleeve is coaxially fixed in the middle of the base. The free end of the clamping screw is coaxially inserted and threadedly fitted into the clamping sleeve, and the mounting end of the clamping screw is axially linked with the pressure plate. A positioning gap is formed between the pressure plate and the positioning slot, which is sufficient to accommodate the component to be welded. In the non-working state, the axial distance between the pressure plate and the positioning slot is large enough to smoothly insert the component to be processed. After one end of the structural component to be processed is reliably fitted into the positioning slot, the clamping screw can be screwed on. This utilizes the threaded fit between the clamping sleeve and the clamping screw, combined with the clamping sleeve's own fixing structure, to achieve axial movement of the clamping screw. This drives the clamping screw to move along its own axis towards the base, thereby causing the pressure plate to move synchronously with the clamping screw until the bottom surface of the pressure plate contacts and reliably abuts against the other end of the structural component located in the positioning slot. In this way, the axial double-end clamping and locking of the structural component being processed can be achieved by the coordinated cooperation of the pressure plate and the positioning slot, thereby further improving the axial positioning effect of the structural component. Combined with the clamping bolts of each side clamping assembly to abut and clamp the side of the structural component being processed, an overall clamping and reliable locking positioning of the structural component in the axial and circumferential directions is formed. This greatly improves the reliability of the clamping and locking structure of the brazing positioning fixture for the structural component being welded, optimizes the clamping effect of the corresponding structural component, and makes the arrangement structure of the structural component more stable during the subsequent brazing process. The corresponding brazing operation accuracy and process efficiency are further improved. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an isometric view of the brazing positioning fixture provided in a specific embodiment of the present invention;

[0023] Figure 2 for Figure 1 A bottom view;

[0024] Figure 3 for Figure 1 Top view;

[0025] Figure 4 for Figure 1 Side sectional view;

[0026] Figure 5 for Figure 1 Axonometric drawing of the assembly structure of the brazing positioning fixture holding the structural components.

[0027] in:

[0028] 10-Structural components;

[0029] 11-Base; 111-Positioning slot; 112-Positioning boss; 113-Auxiliary positioning cavity; 114-Fastening screw; 115-Heat dissipation vent; 116-Heat dissipation fin plate;

[0030] 12-Side clamping assembly; 121-Clamping support; 122-Clamping nut; 123-Clamping bolt; 124-Side positioning cavity; 125-Graphite ejector pin;

[0031] 13-Shaft clamping assembly; 131-Pressure plate; 132-Clamping screw; 133-Clamping sleeve; 134-Positioning clearance; 135-Operating end; 136-Bearing; 137-Pre-positioning boss. Detailed Implementation

[0032] The core of this utility model is to provide a brazing positioning fixture, which can effectively optimize the clamping and positioning effect of the welded structural components, and ensure the structural stability and corresponding welding accuracy of the structural components during the brazing process.

[0033] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] In specific implementation methods, comparison and combination Figure 1 and Figure 5 As shown, the brazing positioning fixture provided by this utility model includes a base 11 with a flat top surface. A positioning slot 111 is coaxially arranged in the middle of the base 11 for the end of the welded structural component 10 to be aligned and inserted. At least three side clamping components 12 are provided on the outer edge of the top surface of the base 11. Each side clamping component 12 is evenly distributed around the outside of the positioning slot 111 along the circumferential direction with the axis of the base 11 as a reference.

[0035] The side clamping assembly 12 includes a clamping support 121 protruding from the top surface of the base 11, and a clamping nut 122 and a clamping bolt 123 arranged on the top of the clamping support 121. The axis of the clamping nut 122 is perpendicular to the axis of the base 11. The threaded end of the clamping bolt 123 is coaxially inserted and threadedly adapted to the clamping nut 122 so that the clamping bolt 123 can reciprocate along the axial direction of the clamping nut 122. The smooth end of the clamping bolt 123 can abut against the outer side wall of the welded structural member 10.

[0036] During equipment operation, one end of the structural component 10 that needs to be welded is aligned and inserted into the positioning slot 111 and fully inserted into place to achieve reliable axial support and positioning of the structural component 10. At this time, the structural component 10 is in the center position at the top of the base 11, while the clamping assemblies 12 on each side are located on the periphery of the structural component 10, and the clamping bolts 123 are not in contact with the structural component 10.

[0037] Then, the clamping nut 122 can be tightened to utilize the threaded fit between the clamping nut 122 and the clamping bolt 123, causing the clamping bolt 123 to move axially toward the structural member 10 until the smooth end of the clamping bolt 123 contacts and reliably abuts against the side outer wall of the structural member 10. Thus, the clamping bolts 123, evenly arranged circumferentially, form a locking and positioning system for the side and circumferential aspects of the structural member 10 to be welded. This achieves separate longitudinal and lateral locking and positioning of the structural member 10. The positioning slot 111 and each clamping bolt 123 cooperate effectively to ensure reliable clamping of the structural member 10 to be welded, optimize the positioning effect of the structural member 10 during the welding process, ensure the structural stability of the structural member 10 during subsequent brazing, and correspondingly improve the accuracy and efficiency of the brazing operation.

[0038] It is easy to understand that the aforementioned clamping supports 121 can be reliably fixed to the base 11 by bolts and locking pins, or they can be welded to the base 11. In practical applications, the number of side clamping components 12 should be no less than three to ensure that the side of the structural component 10 being processed is uniformly clamped and limited along the circumference. Especially when clamping and locking cylindrical, conical, or other structural components 10 with curved outer walls on the sides, the equidistant and uniform arrangement of multiple side clamping components 12 along the circumference can make the side of the structural component 10 being processed more evenly stressed, avoiding damage to the structural component 10 caused by local stress concentration.

[0039] Please combine Figure 3 and Figure 4 As shown.

[0040] Specifically, a shaft clamping assembly 13 is provided above the base 11. The shaft clamping assembly 13 includes a pressure plate 131 aligned above the positioning slot 111, the bottom surface of which abuts against the top of the component 10 to be welded. A clamping screw 132 is coaxially arranged in the middle of the pressure plate 131, and a clamping sleeve 133 is coaxially fixed in the middle of the base 11. The free end of the clamping screw 132 is coaxially inserted and threaded into the clamping sleeve 133, and the mounting end of the clamping screw 132 is axially linked with the pressure plate 131. A positioning gap 134 is formed between the pressure plate 131 and the positioning slot 111, which is sufficient to accommodate the component 10 to be welded. In the non-working state, the axial distance between the pressure plate 131 and the positioning slot 111 is large enough to smoothly insert the component 10 to be processed.

[0041] Before brazing, when installing the structural component 10, after one end of the structural component 10 to be processed is reliably embedded in the positioning slot 111, the clamping screw 132 can be screwed on. In this way, the threaded adaptation structure between the clamping sleeve 133 and the clamping screw 132, combined with the fixing structure of the clamping sleeve 133 itself, can realize the axial movement of the clamping screw 132, so as to drive the clamping screw 132 to move along its own axis towards the base 11, thereby driving the pressure plate 131 to move synchronously with the clamping screw 132 until the bottom surface of the pressure plate 131 contacts and reliably abuts against the other end of the structural component 10 located in the positioning slot 111.

[0042] In this way, the axial double-end clamping and locking of the structural component 10 can be achieved by utilizing the coordinated cooperation of the pressure plate 131 and the positioning slot 111, thereby further improving the axial positioning effect of the structural component 10. Combined with the clamping bolts 123 of each side clamping assembly 12 to abut and clamp the side of the structural component 10, an overall clamping and reliable locking positioning of the structural component 10 in the axial and circumferential directions is formed. This greatly improves the reliability of the clamping and locking structure of the brazing positioning fixture for the structural component 10 to be welded, optimizes the clamping effect of the corresponding structural component 10, and makes the arrangement structure of the structural component 10 more stable in the subsequent brazing process. The corresponding brazing operation accuracy and process efficiency are further improved.

[0043] It should be noted that, as shown in the figure, the assembly end of the clamping screw 132 can extend through and out of the top of the pressure plate 131 to form an operating end 135 for screwing the clamping screw 132. Correspondingly, a bearing 136 can be embedded in the middle of the pressure plate 131 to achieve coaxial assembly between the clamping screw 132 and the pressure plate 131, thereby preventing the pressure plate 131 from rotating along the fixed axis with the clamping screw 132. This allows the pressure plate 131 to only have the ability to reciprocate axially with the clamping screw 132, thereby optimizing the operation mode of the pressure plate 131 and avoiding relative friction and structural impact between the pressure plate 131 and the processed structural component 10.

[0044] Please refer to this carefully. Figure 4 As shown.

[0045] More specifically, a positioning boss 112 is protruding from the top surface of the base 11, and a positioning slot 111 is located on the top surface of the positioning boss 112. The positioning boss 112 has an auxiliary positioning cavity 113 inside, and a clamping sleeving 133 is located in the auxiliary positioning cavity 113. The free end of the clamping screw 132 passes through the positioning boss 112 and extends into the auxiliary positioning cavity 113 to be threadedly connected with the clamping sleeving 133. The positioning cavity can provide sufficient assembly space for the clamping sleeving 133 and other related accessories. Combined with the support structure of the positioning boss 112 itself, it can provide appropriate structural protection for the clamping sleeving 133 and other accessories, preventing these moving parts from interfering with the brazing process of the structural component 10 located above the positioning boss 112.

[0046] Generally, the positioning boss 112 can be a cylindrical or a cone-shaped frustum structure with a smaller top and a larger bottom, so as to be compatible with the generally cylindrical structural member 10. After the structural member 10 is in place, the corresponding load-bearing stress distribution is optimized, so that the positioning boss 112 supports and positions the structural member 10 more stably and reliably.

[0047] Based on this, the clamping sleeve 133 is fixed to the top inner wall of the auxiliary positioning cavity 113 by fastening screws 114. In this way, the assembly strength between the clamping sleeve 133 and the main structure of the positioning boss 112 can be further improved, and structural loosening or misalignment of the clamping sleeve 133 can be avoided, thereby ensuring the transmission efficiency of the threaded engagement between it and the clamping screw 132, and making the axial movement of the clamping screw 132 and the pressure plate 131 more precise and efficient.

[0048] Please refer to the reference. Figure 2 As shown.

[0049] Furthermore, the bottom end of the auxiliary positioning cavity 113 has a heat dissipation port 115 penetrating the base 11. The bottom surface of the base 11 is provided with protruding heat dissipation ribs 116. There are at least two heat dissipation ribs 116, and each heat dissipation rib 116 is evenly distributed circumferentially around the outer side of the heat dissipation port 115 with a clearance fit, based on the axis of the base 11. During the brazing process of the structural component 10 located above the positioning boss 112, the heat generated by the welding process can be conducted to the positioning cavity through the main structure of the positioning boss 112 and dissipated to the external environment through the heat dissipation port 115, preventing overheating of the positioning boss 112 and the components located in the positioning cavity, which could lead to structural damage or functional failure.

[0050] Correspondingly, the gap fit arrangement between each heat dissipation fin plate 116 facilitates airflow so that the heat emitted from the heat dissipation port 115 can be quickly discharged, thereby further improving the heat dissipation efficiency of components such as the positioning boss 112 and the base 11, avoiding local overheating of the brazed positioning fixture, and optimizing its working condition tolerance and adaptability.

[0051] In practical applications, the bottom surface of the pressure plate 131 is provided with a pre-positioning boss 137 that can be adapted to the structural component 10 to be welded. When positioning and installing the structural component 10, the pre-positioning boss 137 can be directly abutted against the end of the structural component 10 to be processed, or the pre-positioning boss 137 can be appropriately inserted into the port of the structural component 10 to be processed. Especially when installing and welding cylindrical or conical structural components 10, the pre-positioning boss 137 can be smoothly inserted into the port of the structural component 10, thereby cooperating with each clamping bolt 123 to form a radial bidirectional clamping and locking of the structural component 10. This further optimizes the clamping strength and positioning reliability of the brazing positioning fixture for the structural component 10, and ensures the corresponding brazing operation accuracy and processing efficiency.

[0052] In practical applications, the prepositioning boss 137 can be made of ceramic material, preferably zirconia ceramic, to further optimize the heat insulation and buffering effect between the pressure plate 131 and the structural component 10 being processed, avoid damage to the main structural components such as the pressure plate 131 caused by the high temperature during the brazing process, and also avoid rigid impact between the pressure plate 131 and the structural component 10 being processed, thereby avoiding non-working damage to the structural component 10 being processed.

[0053] On the other hand, the top of the clamping support 121 has a side positioning cavity 124, in which the clamping nut 122 is embedded, and the outer wall of the clamping nut 122 abuts against the inner wall of the side positioning cavity 124. This positioning cavity can provide reliable structural protection for the clamping nut 122, and by utilizing the abutment fit between the inner wall of the positioning cavity and the outer wall of the clamping nut 122, the assembly position of the clamping nut 122 can be effectively guaranteed to be constant, so as to prevent the clamping nut 122 from rotating or moving axially along with the clamping bolt 123. This further improves the operating efficiency and operating accuracy of the clamping bolt 123, and correspondingly improves the operating efficiency of the clamping bolt 123 in clamping and loosening the side of the processed structural member 10.

[0054] It is easy to understand that the clamping bolt 123 mentioned in this solution can achieve the action of moving closer to and further away from the structural component 10 being processed by rotating in the forward and reverse directions, respectively, to meet the corresponding operational purposes of moving closer to and clamping the structural component 10 and loosening and moving away from the structural component 10, ensuring that the corresponding structural component 10 is loaded and unloaded from the brazing positioning fixture. The operation mode of the pressure plate 131 and its matching clamping screw 132 and clamping sleeve 133 mentioned in this solution is similar to the operation mode of the clamping bolt 123 and clamping nut 122. The reciprocating action also needs to correspond to the loading and unloading requirements of the structural component 10 being processed. Those skilled in the art can refer to this for understanding, and will not be elaborated further.

[0055] In practical applications, the smooth end of the clamping bolt 123 is coaxially equipped with a graphite ejector pin 125 that abuts against the outer side wall of the welded structural component 10. The graphite ejector pin has excellent heat dissipation capabilities, enabling it to withstand high-temperature operating environments for extended periods. This reduces the heat transferred from the working surface to the main structure of the brazing positioning fixture during the welding process, thereby improving the high-temperature tolerance and service life of the main structural components of the brazing positioning fixture.

[0056] Generally, when performing brazing on cylindrical components with side welding surfaces, such as cup holders, as shown in the figure, which are involved in the nuclear industry or other machining fields, the free end of the graphite pin 125 can also be aligned and inserted into the side gap of the processed structural component 10, such as the cup holder, so that the solder can be smoothly fed into the working surface, ensuring the corresponding brazing effect and process requirements.

[0057] In addition, it should be emphasized that the pressure plate 131, clamping nut 122 and clamping bolt 123 are all ceramic parts, preferably made of zirconia ceramic material, so as to effectively reduce the thermal expansion of each pressure plate 131, clamping nut 122 and clamping bolt 123 when heated during the brazing process, avoid structural loosening caused by the thermal expansion of the corresponding components, thereby further improving the assembly structure reliability of each corresponding component, and correspondingly improving the high temperature working condition tolerance and overall service life of the brazing positioning fixture. The clamping and positioning of the processed structural component 10 by the brazing positioning fixture is also more stable and reliable.

[0058] In summary, the brazing positioning fixture provided in this utility model, during operation, involves aligning one end of the structural component to be welded into the positioning slot and fully inserting it into place, thereby achieving reliable axial support and positioning of the structural component. At this time, the structural component is in the center position at the top of the base, while the clamping components on each side are located on the periphery of the structural component, and the clamping bolts are not in contact with the structural component. Then, the clamping nut can be screwed on to utilize the threaded adaptation structure between the clamping nut and the clamping bolt, which drives the clamping bolt to move along its own axis toward the structural component until the smooth end of the clamping bolt contacts and reliably abuts against the outer side wall of the structural component. In this way, the clamping bolts evenly arranged in each circumference can form a side and circumferential locking and positioning of the structural component to be welded. This achieves separate longitudinal and lateral locking and positioning of the structural components being processed. The positioning slots and clamping bolts work together to ensure reliable clamping of the structural components being welded, optimize the positioning effect of the structural components during the welding process, ensure the structural stability of the structural components during the subsequent brazing process, and improve the accuracy and efficiency of the brazing operation.

[0059] The brazing positioning fixture provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A brazing positioning fixture, characterized in that, The base includes a flat top surface, and a positioning slot is coaxially arranged in the middle of the base for the end of the welded structural component to be aligned and inserted. At least three side clamping assemblies are provided on the outer edge of the top surface of the base, and each side clamping assembly is evenly distributed around the outside of the positioning slot along the circumferential direction with the axis of the base as a reference. The side clamping assembly includes a clamping support protruding from the top surface of the base, and a clamping nut and a clamping bolt arranged on the top of the clamping support. The axis of the clamping nut is perpendicular to the axis of the base. The threaded end of the clamping bolt is coaxially inserted and threadedly adapted to the clamping nut so that the clamping bolt can reciprocate along the axial direction of the clamping nut. The smooth end of the clamping bolt can abut against the outer side wall of the welded structural member.

2. The brazing positioning fixture as described in claim 1, characterized in that, A shaft clamping assembly is provided above the base. The shaft clamping assembly includes a pressure plate arranged above the positioning slot. The bottom surface of the pressure plate can abut against the top of the welded structural component. A clamping screw is coaxially arranged in the middle of the pressure plate, and a clamping sleeve is coaxially fixed in the middle of the base. The free end of the clamping screw is coaxially inserted and threaded to the clamping sleeve, and the assembly end of the clamping screw is axially linked with the pressure plate. A positioning gap is formed between the pressure plate and the positioning slot to accommodate the welded structural parts.

3. The brazing positioning fixture as described in claim 2, characterized in that, The base has a positioning boss protruding from its top surface. The positioning slot is located on the top surface of the positioning boss. The positioning boss has an auxiliary positioning cavity inside. The clamping screw is located in the auxiliary positioning cavity. The free end of the clamping screw passes through the positioning boss and extends into the auxiliary positioning cavity to be threadedly connected to the clamping screw.

4. The brazing positioning fixture as described in claim 3, characterized in that, The clamping sleeve is fixed to the top inner wall of the auxiliary positioning cavity by fastening screws.

5. The brazing positioning fixture as described in claim 4, characterized in that, The bottom end of the auxiliary positioning cavity has a heat dissipation port that penetrates the base. The bottom surface of the base is provided with heat dissipation ribs. There are at least two heat dissipation ribs, and each heat dissipation rib is evenly distributed around the outside of the heat dissipation port with a gap fit, taking the axis of the base as a reference.

6. The brazing positioning fixture as described in claim 2, characterized in that, The bottom surface of the pressure plate is provided with a pre-positioning boss that can be adapted to the structural component being welded.

7. The brazing positioning fixture as described in claim 2, characterized in that, The pressure plate is made of ceramic.

8. The brazing positioning fixture as described in claim 1, characterized in that, The top of the clamping support has a side positioning cavity, the clamping nut is embedded in the side positioning cavity, and the outer wall of the clamping nut abuts against the inner wall of the side positioning cavity.

9. The brazing positioning fixture as described in claim 1, characterized in that, The smooth end of the clamping bolt is coaxially and linked with a graphite pin that can abut against the outer side wall of the welded structural component.

10. The brazing positioning fixture as described in claim 1, characterized in that, Both the clamping nut and the clamping bolt are made of ceramic.

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