Equal force locking device for brazing jig

Abstract

The utility model discloses a kind of force equalizing locking devices for brazing jig, including base, fixed frame, jacking assembly and positioning assembly, fixed frame is set on base by positioning assembly;Pre-set position is provided on fixed frame, pre-set position is located directly above jacking assembly, jacking assembly at least includes force equalizing top plate and jacking drive unit, the output end of jacking drive unit is connected to force equalizing top plate, jacking drive unit drives force equalizing top plate reciprocating motion up and down towards pre-set position, when jacking drive unit drives force equalizing top plate to rise, the jig on force equalizing top plate is lifted upwards, so that at least part of the jig on force equalizing top plate is located in pre-set position, in this way, by the structural design between fixed frame and jacking assembly, ensure that jig moves along pre-set trajectory during being jacked, finally stably fall into pre-set position, so that the relative position accuracy of jig and workpiece is significantly improved, brazing misplacement, brazing filler metal filling defect caused by inaccurate positioning is reduced.

Description

Technical Field

[0001] This utility model relates to the field of brazing process equipment, and in particular to a force equalization locking device for brazing fixtures. Background Technology

[0002] Vacuum brazing refers to the process of welding two workpieces in a vacuum environment using a metal with a melting point lower than that of the workpiece as a filler metal. The filler metal is placed between the workpieces (such as between ceramic and metal workpieces), and then the workpieces and filler metal are heated so that only the filler metal melts while the workpieces do not melt. This allows the liquid filler metal to fill the weld seam and wet the workpieces. Then, the workpieces are cooled to solidify, thus achieving the welding between the workpieces.

[0003] In vacuum brazing or protective atmosphere brazing, the workpieces to be welded are typically clamped and positioned using specialized fixtures (or jigs) to ensure the relative position and assembly clearance between the workpieces. In brazing processes (such as vacuum brazing and protective atmosphere brazing), the positioning accuracy and locking stability of the fixture directly affect the welding quality of the workpieces, as the workpieces need to maintain a precise relative position using the fixture during the brazing process.

[0004] In existing technologies, fixtures are often secured by multiple screws directly from the sides or top. However, this locking method has the following drawbacks: for example, operators cannot tighten all screws simultaneously and must tighten them sequentially. This sequential tightening method leads to uneven stress on the fixture and internal workpieces, causing slight twisting or deformation. This results in inconsistent assembly gaps between workpieces at the microscopic level. Since brazing is extremely sensitive to gaps, uneven gaps will directly prevent the brazing filler metal from spreading evenly, resulting in low welding rate, incomplete welding, and other quality problems, which seriously affect product yield.

[0005] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0006] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide a force-equalizing locking device for brazing fixtures. Through the structural design between the fixed frame and the lifting component, it ensures that the fixture moves along a preset trajectory during the lifting process and finally falls stably into the preset position. In this way, the relative positional accuracy between the fixture and the workpiece is significantly improved, reducing defects such as brazing misalignment and poor filler metal filling caused by inaccurate positioning.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A force-equalizing locking device for a brazing fixture includes a base and a fixed frame, a lifting component, and a positioning component disposed on the base. The fixed frame is disposed on the base via the positioning component. The fixed frame is provided with a preset position for providing precise positioning and guidance for the fixture, wherein the preset position is located directly above the lifting component.

[0009] The lifting assembly includes at least a force-equalizing top plate for placing the fixture and a lifting drive unit. The output end of the lifting drive unit is connected to the force-equalizing top plate. The lifting drive unit drives the force-equalizing top plate to move up and down reciprocally toward a preset position. When the lifting drive unit drives the force-equalizing top plate to rise, it lifts the fixture on the force-equalizing top plate upward, so that at least a part of the fixture on the force-equalizing top plate is located within the preset position.

[0010] As a preferred embodiment, the base is provided with a mounting position for installing the lifting drive unit, which is fixedly installed in the mounting position by bolts to ensure the stability of the lifting drive unit installation.

[0011] As a preferred embodiment, a number of mounting holes are provided on the side of the mounting position, and a number of telescopic rods are provided at the mounting holes. The upper ends of the telescopic rods are connected to the lower end of the force equalizing top plate, so that the force equalizing top plate can selectively move up and down under the drive of the lifting drive unit.

[0012] As a preferred embodiment, the positioning component includes at least a plurality of positioning rods, the lower ends of which are connected to the base, and positioning holes are provided at the four corners of the fixing frame, with the upper ends of the plurality of positioning rods connected to the positioning holes.

[0013] As a preferred embodiment, the lifting drive unit is a pneumatic cylinder, a hydraulic cylinder, or an electric push rod.

[0014] As a preferred embodiment, the force-equalizing top plate is a rectangular steel plate.

[0015] As a preferred embodiment, the output end of the lifting drive unit is connected to a piston rod, the upper end of which is threaded to the lower end of the force equalizing top plate; or, it is fixedly connected to the lower end of the force equalizing top plate via a flange.

[0016] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, the main feature is that the fixed frame is set on the base through the positioning component, and the preset position is specifically used for the precise positioning and guidance of the fixture, ensuring that the fixture moves along the preset trajectory during the lifting process and finally falls stably into the preset position. In this way, the relative position accuracy between the fixture and the workpiece is significantly improved, reducing defects such as brazing misalignment and poor filler metal filling caused by inaccurate positioning.

[0017] Secondly, the force-equalizing top plate serves as the load-bearing component of the fixture. The driving force of the lifting drive unit is evenly transmitted to the bottom of the fixture, ensuring consistent stress across all areas. This effectively prevents micro-deformation caused by excessive local stress, thus ensuring that the workpiece maintains its preset shape and fit during brazing and improving the consistency of joint strength. Furthermore, the lifting drive unit drives the force-equalizing top plate to automatically lift the fixture. Stable locking is achieved through the guide of the preset position and the limit of the fixed frame, preventing the fixture from loosening or shifting. In this state, all screw holes are aligned, and the force around the fixture is balanced. At this point, the operator then tightens all screws sequentially. Since the screws are tightened in a state where the fixture is already under balanced force, the problem of uneven force caused by sequential tightening is completely eliminated.

[0018] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a perspective view of an embodiment of the present utility model (the fixture is not shown);

[0020] Figure 2 This is another perspective view of an embodiment of the present utility model (fixture not shown);

[0021] Figure 3 This is another perspective view of an embodiment of the present utility model (fixture not shown);

[0022] Figure 4 This is a cross-sectional view of an embodiment of the present utility model (fixture not shown);

[0023] Figure 5 This is a front view of an embodiment of the present invention (initial state of the uniform force top plate);

[0024] Figure 6 This is another front view of an embodiment of the present invention (the top plate is in the rising state).

[0025] Explanation of reference numerals in the attached diagram:

[0026] 10. Base 11. Mounting position

[0027] 12. Mounting holes

[0028] 20. Fixed frame 21. Preset position

[0029] 22. Positioning holes

[0030] 30. Lifting assembly; 31. Force-equalizing roof plate

[0031] 32. Lifting drive unit; 321. Piston rod

[0032] 33. Telescopic pole

[0033] 40. Positioning assembly; 41. Positioning rod

[0034] 50. Jig. Detailed Implementation

[0035] Please refer to Figures 1 to 6 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0036] In the description of this utility model, it should be noted that the directional terms such as "up", "down", "front", "back", "left", and "right" indicate the orientation and positional relationship based on the accompanying drawings or the orientation or positional relationship shown when wearing and using the device normally. They are only for the convenience of describing this utility model and simplifying the description, 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. They should not be construed as limiting the specific protection scope of this utility model.

[0037] A force-equalizing locking device for a brazing fixture includes a base 10, a fixing frame 20, a lifting component 30, and a positioning component 40.

[0038] The fixed frame 20, lifting assembly 30, and positioning assembly 40 are disposed on the base 10. Preferably, the base 10 is provided with a mounting position 11 for mounting the lifting drive unit 32, and the lifting drive unit 32 is fixedly installed in the mounting position 11 by bolts to ensure the installation stability of the lifting drive unit 32.

[0039] Preferably, a plurality of mounting holes 12 are provided on the side of the mounting position 11, and a plurality of telescopic rods 33 are provided at the plurality of mounting holes 12. The upper ends of the plurality of telescopic rods 33 are connected to the lower end of the force equalizing top plate 31, so that the force equalizing top plate 31 can selectively move up and down under the drive of the lifting drive unit 32.

[0040] The fixed frame 20 is mounted on the base 10 via a positioning component 40. The fixed frame 20 is provided with a preset position 21 for providing precise positioning and guidance for the fixture 50, wherein the preset position 21 is located directly above the lifting component 30. Preferably, the positioning component 40 includes at least a plurality of positioning rods 41, the lower ends of which are connected to the base 10, and positioning holes 22 are provided at each of the four corners of the fixed frame 20, with the upper ends of which are connected to the positioning holes 22.

[0041] The lifting assembly 30 includes at least a force-equalizing top plate 31 for placing the fixture 50 and a lifting drive unit 32. Preferably, the force-equalizing top plate 31 is a rectangular steel plate. The output end of the lifting drive unit 32 is connected to the force-equalizing top plate 31. The lifting drive unit 32 drives the force-equalizing top plate 31 to move up and down reciprocally toward the preset position 21. When the lifting drive unit 32 drives the force-equalizing top plate 31 to rise, it lifts the fixture 50 on the force-equalizing top plate 31 upward, so that at least a portion of the fixture 50 on the force-equalizing top plate 31 is located within the preset position 21.

[0042] Preferably, the output end of the lifting drive unit 32 is connected to a piston rod 321, and the upper end of the piston rod 321 is threadedly connected to the lower end of the force equalizing top plate 31; or, it is fixedly connected to the lower end of the force equalizing top plate 31 through a flange.

[0043] Preferably, the lifting drive unit 32 is a pneumatic cylinder, a hydraulic cylinder, or an electric push rod. Alternatively, the lifting drive unit 32 can also use a servo motor-driven screw-slider mechanism to drive the force-equalizing top plate 31 to move up and down. The appropriate drive structure can be selected according to actual needs, which will not be elaborated here.

[0044] The general working process of this embodiment is described in detail below:

[0045] First, place the fixture 50 with the workpiece mounted on the force-equalizing top plate 31 on the base 10. Then, activate the lifting drive unit 32 to push the force-equalizing top plate 31 upward, lifting the fixture 50 and the workpiece together from the bottom until the upper pressure plate or locking surface of the fixture 50 is completely pressed against the upper fixed frame 20 (or another part of the fixture 50) (pressed against the preset position 21). In this state, all screw holes are aligned, and the force on the fixture 50 is balanced. At this point, the operator tightens all screws in sequence.

[0046] The key design feature of this utility model is that the fixed frame is set on the base through the positioning component, and the preset position is specifically used for the precise positioning and guidance of the fixture, ensuring that the fixture moves along the preset trajectory during the lifting process and finally falls stably into the preset position. In this way, the relative positional accuracy between the fixture and the workpiece is significantly improved, reducing defects such as brazing misalignment and poor filler metal filling caused by inaccurate positioning.

[0047] Secondly, the force-equalizing top plate serves as the load-bearing component of the fixture. The driving force of the lifting drive unit is evenly transmitted to the bottom of the fixture, ensuring consistent stress across all areas. This effectively prevents micro-deformation caused by excessive local stress, thus ensuring that the workpiece maintains its preset shape and fit during brazing and improving the consistency of joint strength. Furthermore, the lifting drive unit drives the force-equalizing top plate to automatically lift the fixture. Stable locking is achieved through the guide of the preset position and the limit of the fixed frame, preventing the fixture from loosening or shifting. In this state, all screw holes are aligned, and the force around the fixture is balanced. At this point, the operator then tightens all screws sequentially. Since the screws are tightened in a state where the fixture is already under balanced force, the problem of uneven force caused by sequential tightening is completely eliminated.

[0048] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A force-equalizing locking device for a brazing fixture, characterized in that: It includes a base and a fixed frame disposed on the base, a lifting component and a positioning component, wherein the fixed frame is disposed on the base via the positioning component; the fixed frame is provided with a preset position for providing precise positioning and guidance for the fixture, wherein the preset position is located directly above the lifting component; The lifting assembly includes at least a force-equalizing top plate for placing the fixture and a lifting drive unit. The output end of the lifting drive unit is connected to the force-equalizing top plate. The lifting drive unit drives the force-equalizing top plate to move up and down reciprocally toward a preset position. When the lifting drive unit drives the force-equalizing top plate to rise, it lifts the fixture on the force-equalizing top plate upward, so that at least a part of the fixture on the force-equalizing top plate is located within the preset position.

2. The force-equalizing locking device for brazing fixtures according to claim 1, characterized in that: The base is provided with a mounting position for installing the lifting drive unit, which is fixedly installed in the mounting position by bolts.

3. The force-equalizing locking device for brazing fixtures according to claim 2, characterized in that: Several mounting holes are provided on the side of the mounting position, and several telescopic rods are provided at the mounting holes. The upper ends of the telescopic rods are connected to the lower end of the force equalization top plate.

4. The force-equalizing locking device for brazing fixtures according to claim 1, characterized in that: The positioning component includes at least a number of positioning rods, the lower ends of which are connected to the base. Positioning holes are provided at the four corners of the fixed frame, and the upper ends of the positioning rods are connected to the positioning holes.

5. The force-equalizing locking device for brazing fixtures according to claim 1, characterized in that: The lifting drive unit is a pneumatic cylinder, a hydraulic cylinder, or an electric push rod.

6. The force-equalizing locking device for brazing fixtures according to claim 1, characterized in that: The uniform force top plate is a rectangular steel plate.

7. The force-equalizing locking device for brazing fixtures according to claim 1, characterized in that: The output end of the lifting drive unit is connected to a piston rod, the upper end of which is threaded to the lower end of the force equalizing top plate; or, it is fixedly connected to the lower end of the force equalizing top plate via a flange.

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