A pressure sensor welding apparatus

Abstract

The present application relates to a kind of pressure sensor welding equipment applied to pressure sensor processing field, including welding rack, still including welding mechanism and auxiliary positioning mechanism, auxiliary positioning mechanism includes down module and fixed module, down module includes lifting drive equipment, pressing column, limiting cylinder and pressure ring assembly;Fixed module includes support seat and limiting seat, the cooperation of the present scheme setting of pressing column, limiting cylinder, pressure ring assembly and limiting seat, the process of lifting drive equipment driving pressing column and pressure ring assembly to the synchronous down of film, can avoid the edge of film to be deformed, and after separating pressure ring assembly later, the pressure of pressing column to film is invariable, so the edge of film still cannot be deformed, make the edge of film and the edge of film mounting seat in subsequent welding process close to seamless fit, make the welding point more smooth and light, improve the welding quality, reduce the damage caused to pressure sensor.

Description

Technical Field

[0001] The present invention relates to a welding device, and more particularly to a pressure sensor welding device used in the field of pressure sensor processing. Background Technology

[0002] Thin-walled metal films, as an important component of pressure sensors, play a crucial role in sensing the measured pressure and isolating the measured environment from the internal signal conversion structure of the pressure sensor. The welding quality of the thin-walled metal film in a pressure sensor directly affects its performance and lifespan, and is one of the core technologies in pressure sensor manufacturing.

[0003] In pressure sensors, the connection between the thin-walled metal film and the sensor housing is achieved through welding. Current methods use fusion welding, and laser welding or electron beam welding, which offer higher energy density and lower heat input, are generally preferred. However, because the wall thickness of the currently used thin-walled metal film is only 0.02mm-0.04mm, welding begins at any point on the circumference to be welded and continues until the entire circumference is completed and an lap weld is formed. As welding progresses, welding heat gradually accumulates on the circumference, creating secondary welding heat input at the weld lap joint. This results in uneven welding stress on the circumference of the thin-walled metal film weld, making it prone to localized deformation and bending after welding, affecting its performance in the pressure sensor and leading to product defects. Furthermore, fusion welding of this structure requires prior assembly and tack welding for fixation. Due to the extremely thin wall thickness of the metal film, assembly and tack welding operations are difficult and inefficient.

[0004] To address the aforementioned issues, a search revealed a welding device and method for a thin-walled metal film of a pressure sensor, disclosed in patent application CN202311448558.1. The welding device includes an upper electrode and a lower electrode. A pressure ring is provided on the lower end face of the upper electrode, and an annular boss for pressing the thin-walled metal film is provided on the lower end face of the pressure ring. A positioning ring for engaging and fixing the top of the sensor housing is provided at the bottom of the upper electrode. An engaging groove for engaging and fixing the bottom of the sensor housing is provided at the top of the lower electrode. Both the top of the upper electrode and the bottom of the lower electrode are fixedly connected to the pressure output end of an external press. Cables electrically connected to an external welding machine are provided inside both the upper and lower electrodes. This achieves one-time, integral welding of the thin-walled metal film to the circumferential weld seam of the sensor housing, eliminating continuous welding of the circumferential weld seam and secondary welding at weld overlap positions, improving the welding heat input process, and effectively avoiding localized deformation and bending of the thin-walled metal film during welding.

[0005] However, in the aforementioned pressure sensor welding equipment, the outer diameter of the pressure ring is the same as the outer diameter of the thin-walled metal film. During the assembly and clamping process, the annular boss at the bottom of the pressure ring will cause the edge of the thin-walled metal film to deform under the clamping state, specifically, the edge will curl upwards, resulting in larger weld points later. On the one hand, this will lead to a longer welding time, which will easily cause high-temperature burns and reduce the welding quality. On the other hand, larger weld points will result in poor weld aesthetics. Therefore, a pressure sensor welding equipment is proposed to improve the above problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention in view of the above-mentioned prior art is that the outer diameter of the pressure ring of the pressure sensor welding equipment is the same as the outer diameter of the thin-walled metal film. During the assembly and pressing process, the annular boss at the bottom of the pressure ring will cause the edge of the thin-walled metal film to deform under the pressing state, specifically, the edge will curl up, resulting in a larger weld point in the later stage. On the one hand, it will lead to a longer welding time, which will easily lead to high temperature burns and reduce the welding quality. On the other hand, the larger weld point will result in poor welding aesthetics.

[0007] To address the above problems, the present invention provides a pressure sensor welding device, including a welding frame, and further comprising:

[0008] The welding mechanism is installed at the inner bottom end of the welding frame;

[0009] An auxiliary positioning mechanism, comprising a pressing module and a fixing module, wherein the pressing module is located directly above the fixing module;

[0010] The pressing module includes a lifting drive device, a pressing column, a limiting cylinder, and a pressure ring assembly;

[0011] The lifting drive device is installed at the top of the welding frame, the clamping column is fixedly installed on the bottom output end of the lifting drive device, and the pressure ring assembly is installed at the bottom end of the clamping column.

[0012] The fixed module includes a support base and a limit base;

[0013] The support base is fixed to the inner bottom end of the welding frame, and the limiting seat is fixed to the top end of the support base. The upper end of the limiting seat is provided with a limiting groove. The diameter of the limiting groove and the outer diameter of the pressure ring assembly are consistent with the inner diameter of the limiting cylinder.

[0014] In the aforementioned pressure sensor welding equipment, the lower half of the diaphragm mounting base is placed inside the limiting seat through the coordinated arrangement of the clamping column, limiting cylinder, pressure ring assembly, and limiting seat. Then, the limiting cylinder is placed outside the upper half of the diaphragm mounting base, and the diaphragm is placed on the upper end of the diaphragm mounting base. Next, the clamping column and pressure ring assembly are driven to descend synchronously using a lifting drive device to press down on the diaphragm, pressing it firmly against the upper end of the diaphragm mounting base. Afterward, the limiting cylinder is separated from the diaphragm mounting base, and the pressure ring assembly is separated from the diaphragm. The welding mechanism can then weld the edge of the diaphragm to the edge of the diaphragm mounting base. Because the clamping column and pressure ring assembly press down on the diaphragm synchronously, deformation of the diaphragm edge is avoided. Furthermore, even after the pressure ring assembly is separated, the pressure of the clamping column on the diaphragm remains unchanged, so the edge of the diaphragm will not deform. This results in a near-seamless fit between the edge of the diaphragm and the edge of the diaphragm mounting base during the welding process, making the weld joint smoother and lighter, improving welding quality, and reducing damage to the pressure sensor.

[0015] As a further supplement to this application, the opening of the limiting groove is chamfered, which gives the film mounting base a certain degree of tolerance when it is inserted, making it easier for the film mounting base to be inserted smoothly.

[0016] As a further supplement to this application, the pressure ring assembly includes a connecting ring, which is threadedly connected to the surface of the pressure column, and the connecting ring has vertical anti-slip textures on its circumference. A lifting drive device drives the pressure column and the pressure ring assembly to descend synchronously, pressing the film down until it is pressed against the upper end of the film mounting base. Then, the connecting ring is rotated, causing it to move upwards relative to the pressure column, thereby separating it from the film. At this point, a welding mechanism can be used to weld the edge of the film to the edge of the film mounting base, preventing the connecting ring from being welded to the film. The vertical anti-slip textures on the circumference of the connecting ring facilitate rotation by the operator.

[0017] As a further supplement to this application, the pressure ring assembly also includes a movable ring, which is horizontally rotatably mounted at the bottom end of the connecting ring. Since the movable ring is rotatably connected to the connecting ring, when the connecting ring is rotated, the movable ring is not easy to rotate under the action of relatively small frictional force between it and the film. Instead, it moves upward synchronously with the connecting ring. Compared with the connecting ring directly contacting the film, the movable ring can reduce the frictional damage to the film.

[0018] As a further supplement to this application, a limiting protrusion is integrally provided on the surface of the clamping column, and an annular limiting groove is provided on the inner wall of the connecting ring to limit the connection. The height of the annular limiting groove is greater than the thickness of the limiting protrusion. The limiting protrusion and the annular limiting groove can limit the connection and prevent the connection from detaching from the clamping column.

[0019] As a further supplement to this application, when the connecting ring is rotated downwards to a state where it cannot rotate further, the lower end face of the movable ring and the lower end face of the clamping column are on the same horizontal plane; this ensures that the lifting drive device drives the clamping column and the clamping ring assembly to descend synchronously and press the film against the upper end of the film mounting base, maintaining the flatness of the film surface.

[0020] As a further supplement to this application, a lower connecting cover is fixed to the outside of the limiting cylinder, and an upper connecting cover is fixed to the outside of the pressing column. The lower connecting cover and the upper connecting cover are threaded together. After the film is pressed, the lower connecting cover and the upper connecting cover are threaded together to facilitate the fixed storage of the limiting cylinder.

[0021] As a further supplement to this application, the welding mechanism includes an electric rotating ring and a welding head. The electric rotating ring is installed at the inner bottom end of the welding frame and is coaxially arranged with the limiting seat. The welding head is installed at the upper end of the electric rotating ring, and the electric rotating ring drives the welding head to perform circular motion around the axis of the limiting seat.

[0022] As a further supplement to this application, both the upper and lower ends of the limiting cylinder are chamfered inward. The inward chamfer at the upper end of the limiting cylinder allows for a certain degree of fault tolerance during the downward movement of the pressure ring assembly, making the downward movement smoother. The inward chamfer at the lower end of the limiting cylinder allows for a certain degree of fault tolerance during the process of the limiting cylinder being fitted onto the outside of the film mounting base, making the fitting smoother.

[0023] In summary, by coordinating the clamping column, limiting cylinder, pressure ring assembly, and limiting seat, the lower half of the film mounting base can be placed inside the limiting seat. Then, the limiting cylinder is fitted over the upper half of the film mounting base, and the film is placed on the upper end of the film mounting base. Next, a lifting drive device drives the clamping column and pressure ring assembly to descend synchronously, pressing the film down and securing it to the upper end of the film mounting base. Afterward, the limiting cylinder is separated from the film mounting base, and the lower connecting cover is threadedly connected to the upper connecting cover for easy and secure storage. Then, rotating the connecting ring causes it to move upward relative to the clamping column, thus separating it from the film and preventing the movable ring from being welded to the film. During this process, the movable ring is less prone to rotation due to the relatively small frictional force between it and the membrane. Instead, it moves upward synchronously with the connecting ring. Compared to the connecting ring directly contacting the membrane, the movable ring reduces frictional damage to the membrane. Subsequently, the welding mechanism can be used to weld the edge of the membrane to the edge of the membrane mounting base. Since the clamping column and the clamping ring assembly press down on the membrane synchronously, deformation of the membrane edge can be avoided. Furthermore, after the clamping ring assembly is separated later, the pressure of the clamping column on the membrane remains unchanged, so the edge of the membrane will still not deform. This makes the edge of the membrane and the edge of the membrane mounting base almost seamlessly fit during the welding process, resulting in a smoother and lighter weld point, improved welding quality, and reduced damage to the pressure sensor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure in the unassembled state according to the first embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the overall three-dimensional structure in the assembled state according to the first embodiment of this application;

[0026] Figure 3 This is a partial three-dimensional structural schematic diagram of the auxiliary positioning mechanism according to the first embodiment of this application;

[0027] Figure 4 This is a cross-sectional structural diagram of the pressure module in the first embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the planar structure in the first embodiment of this application, showing the limiting cylinder sleeved on the outer side of the upper half of the film mounting base.

[0029] Figure 6 This is a schematic diagram of the planar structure of the pressing module in the pressing state according to the first embodiment of this application;

[0030] Figure 7 This is a schematic diagram of the planar structure of the fixed storage and limiting cylinder in the first embodiment of this application;

[0031] Figure 8 This is a schematic diagram of the planar structure of the pressure ring assembly in the separated state from the film in the first embodiment of this application.

[0032] Explanation of the labels in the diagram:

[0033] 1. Welding frame; 2. Electric rotating ring; 3. Welding head; 4. Lifting drive device; 5. Pressing column; 501. Limiting protrusion ring; 6. Support seat; 7. Limiting seat; 8. Limiting cylinder; 9. Pressing ring assembly; 91. Connecting ring; 9101. Annular limiting groove; 92. Movable ring; 10. Lower connecting cover; 11. Upper connecting cover. Detailed Implementation

[0034] The following describes one embodiment of this application in detail with reference to the accompanying drawings.

[0035] Implementation method 1:

[0036] This invention provides a pressure sensor welding device; please refer to [link / reference]. Figure 1-8 It includes a welding frame 1, as well as a welding mechanism and an auxiliary positioning mechanism.

[0037] The welding mechanism is installed at the inner bottom end of the welding frame 1, specifically, as follows: Figure 1 and Figure 2As shown, the welding mechanism includes an electric rotating ring 2 and a welding head 3. The electric rotating ring 2 is installed at the inner bottom end of the welding frame 1, and the welding head 3 is installed at the upper end of the electric rotating ring 2.

[0038] Regarding the aforementioned auxiliary positioning mechanism, specifically, such as Figure 1 and Figure 2 As shown, the auxiliary positioning mechanism includes a pressing module and a fixing module. The pressing module is located directly above the fixing module. More specifically, the pressing module includes a lifting drive device 4, a clamping column 5, a limiting cylinder 8, and a pressure ring assembly 9. The lifting drive device 4 is installed at the top of the welding frame 1. The clamping column 5 is fixedly installed on the bottom output end of the lifting drive device 4. The pressure ring assembly 9 is installed at the bottom end of the clamping column 5. The fixing module includes a support base 6 and a limiting base 7. The support base 6 is fixed to the inner bottom end of the welding frame 1. The limiting base 7 is fixed to the top end of the support base 6. A limiting groove is provided at the upper end of the limiting base 7. The diameter of the limiting groove and the outer diameter of the pressure ring assembly 9 are consistent with the inner diameter of the limiting cylinder 8.

[0039] The electric rotating ring 2 is set on the same axis as the limiting seat 7, and the electric rotating ring 2 drives the welding head 3 to move in a circular motion around the axis of the limiting seat 7.

[0040] This pressure sensor welding equipment, through the coordinated arrangement of the clamping column 5, the limiting cylinder 8, the pressure ring assembly 9, and the limiting seat 7, allows the lower half of the diaphragm mounting base to be placed inside the limiting seat 7. Then, the limiting cylinder 8 is placed over the upper half of the diaphragm mounting base, and the diaphragm is placed on the upper end of the diaphragm mounting base. Next, the lifting drive device 4 drives the clamping column 5 and the pressure ring assembly 9 to descend synchronously, pressing the diaphragm firmly against the upper end of the diaphragm mounting base. Afterward, the limiting cylinder 8 is separated from the diaphragm mounting base, and the pressure ring assembly 9 is separated from the diaphragm. The welding mechanism then welds the edge of the diaphragm to the edge of the diaphragm mounting base. Because the clamping column 5 and the pressure ring assembly 9 press down synchronously on the diaphragm, deformation of the diaphragm edge is prevented. Furthermore, even after the pressure ring assembly 9 is separated, the pressure of the clamping column 5 on the diaphragm remains unchanged, so the edge of the diaphragm will not deform. This results in a near-seamless fit between the edge of the diaphragm and the edge of the diaphragm mounting base during the welding process, making the weld joint smoother and lighter, improving welding quality, and reducing damage to the pressure sensor.

[0041] Among them, such as Figure 4 As shown, the pressure ring assembly 9 includes a connecting ring 91, which is threaded to the surface of the pressure post 5, and the connecting ring 91 has vertical anti-slip textures on its circumference, which facilitates the operator to rotate the connecting ring 91.

[0042] Based on the above structural configuration, the lifting drive device 4 drives the pressing column 5 and the pressing ring assembly 9 to descend synchronously and press the film down until the film is pressed against the upper end of the film mounting base. Then, the connecting ring 91 is rotated so that the connecting ring 91 moves upward relative to the pressing column 5, thereby separating it from the film. At this time, the welding mechanism can be used to weld the edge of the film to the edge of the film mounting base, avoiding welding the connecting ring 91 to the film.

[0043] Among them, further, such as Figure 4 As shown, the pressure ring assembly 9 also includes a movable ring 92, which is horizontally rotatably mounted on the bottom end of the connecting ring 91.

[0044] Based on the above structural arrangement, since the movable ring 92 is rotatably connected to the connecting ring 91, when the connecting ring 91 is rotated, the movable ring 92 is not easy to rotate under the relatively small frictional force between it and the film. Instead, it moves upward synchronously with the connecting ring 91. Compared with the connecting ring 91 directly contacting the film, the movable ring 92 can reduce the frictional damage to the film.

[0045] Among them, such as Figure 4 As shown, a limiting protrusion ring 501 is integrally provided on the surface of the clamping column 5, and an annular limiting groove 9101 is provided on the inner wall of the connecting ring 91 to limit and cooperate with the limiting protrusion ring 501. The height of the annular limiting groove 9101 is greater than the thickness of the limiting protrusion ring 501. The limiting protrusion ring 501 and the annular limiting groove 9101 can limit the connecting ring 91 and prevent the connecting ring 91 from detaching from the clamping column 5.

[0046] As a further limitation, when the connecting ring 91 is rotated downwards to a state where it cannot rotate, the lower end face of the movable ring 92 and the lower end face of the pressing column 5 are on the same horizontal plane; this ensures that the lifting drive device 4 drives the pressing column 5 and the pressing ring assembly 9 to descend synchronously and press the film against the upper end of the film mounting base, maintaining the flatness of the film surface.

[0047] The limiting cylinder 8 is fixed with a lower connecting cover 10 on the outside, and the pressing column 5 is fixed with an upper connecting cover 11 on the outside. The lower connecting cover 10 and the upper connecting cover 11 are threaded together. After the film is pressed, the lower connecting cover 10 and the upper connecting cover 11 are threaded together to facilitate the fixing and storage of the limiting cylinder 8.

[0048] Among them, such as Figure 3 As shown, the opening of the limiting groove is chamfered, which gives the film mounting base a certain degree of tolerance when it is inserted, making it easier to insert the film mounting base smoothly.

[0049] Similarly, both the upper and lower ends of the limiting cylinder 8 are chamfered inwards. The inward chamfer at the upper end of the limiting cylinder 8 allows for a certain degree of fault tolerance during the downward movement of the pressure ring assembly 9, making the downward movement smoother. The inward chamfer at the lower end of the limiting cylinder 8 allows for a certain degree of fault tolerance during the process of the limiting cylinder 8 being fitted onto the outside of the film mounting base, making the fitting smoother.

[0050] Working principle: When using it, first assemble it, and the specific operation is as follows:

[0051] like Figure 5 As shown, the lower half of the film mounting base is placed inside the limiting seat 7;

[0052] Next, the limiting sleeve 8 is placed on the outer side of the upper half of the membrane mounting base;

[0053] Then place the film on the top of the film mounting base;

[0054] Rotate the connecting ring 91 so that it moves downward to a state where it cannot rotate (at this time, the lower end face of the movable ring 92 and the lower end face of the pressing column 5 are on the same horizontal plane; this ensures that the lifting drive device 4 drives the pressing column 5 and the pressing ring assembly 9 to descend synchronously and press the film against the upper end of the film mounting base, maintaining the flatness of the film surface).

[0055] Next, the clamping and positioning process is performed, as follows:

[0056] like Figure 6 As shown, the lifting drive device 4 drives the pressing column 5 and the pressing ring assembly 9 to descend synchronously and press down on the film, so that the film is pressed against the upper end of the film mounting base.

[0057] like Figure 7 As shown, the limiting cylinder 8 is then separated from the film mounting base, and the lower connecting cover 10 is threadedly connected to the upper connecting cover 11 to facilitate the fixed storage of the limiting cylinder 8.

[0058] like Figure 8 As shown, the connecting ring 91 is then rotated, causing the connecting ring 91 to move upward relative to the pressing column 5 with the movable ring 92, thereby separating it from the film (avoiding welding the movable ring 92 to the film, and when the connecting ring 91 is rotated, the movable ring 92 is not easy to rotate under the relatively small frictional force between it and the film, but moves upward synchronously with the connecting ring 91. Compared with the connecting ring 91 directly contacting the film, the movable ring 92 can reduce the frictional damage to the film).

[0059] After that, the edge of the film can be welded to the edge of the film mounting base using a welding mechanism. (Since the clamping column 5 and the pressure ring assembly 9 press down on the film simultaneously, the edge of the film can be prevented from deforming. After the pressure ring assembly 9 is separated later, the pressure of the clamping column 5 on the film remains unchanged, so the edge of the film will not be deformed. This makes the edge of the film and the edge of the film mounting base fit almost seamlessly during the welding process, making the weld point smoother and lighter, improving the welding quality and reducing the damage to the pressure sensor.)

[0060] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A pressure sensor welding device, comprising a welding frame (1), characterized in that: Also includes: A welding mechanism is installed at the inner bottom end of the welding frame (1); An auxiliary positioning mechanism, comprising a pressing module and a fixing module, wherein the pressing module is located directly above the fixing module; The pressing module includes a lifting drive device (4), a pressing column (5), a limiting cylinder (8), and a pressure ring assembly (9). The lifting drive device (4) is installed at the top of the welding frame (1), the clamping column (5) is fixedly installed on the bottom output end of the lifting drive device (4), and the pressure ring assembly (9) is installed at the bottom end of the clamping column (5). The fixing module includes a support base (6) and a limiting base (7); The support base (6) is fixed to the inner bottom end of the welding frame (1), the limiting seat (7) is fixed to the top end of the support base (6), the upper end of the limiting seat (7) is provided with a limiting groove, the diameter of the limiting groove and the outer diameter of the pressure ring assembly (9) are consistent with the inner diameter of the limiting cylinder (8); The pressure ring assembly (9) includes a connecting ring (91), which is threaded to the surface of the pressure post (5), and the circumference of the connecting ring (91) is provided with vertical anti-slip texture. The pressure ring assembly (9) also includes a movable ring (92), which is horizontally rotatably mounted on the bottom end of the connecting ring (91).

2. The pressure sensor welding equipment according to claim 1, characterized in that: The opening of the limiting groove is chamfered.

3. The pressure sensor welding equipment according to claim 1, characterized in that: The surface of the clamping column (5) is integrally provided with a limiting protrusion ring (501), and the inner wall of the connecting ring (91) is provided with an annular limiting groove (9101) that is limited and matched with the limiting protrusion ring (501). The height of the annular limiting groove (9101) is greater than the thickness of the limiting protrusion ring (501).

4. The pressure sensor welding equipment according to claim 3, characterized in that: When the connecting ring (91) is rotated downwards to a state where it cannot rotate, the lower end face of the movable ring (92) and the lower end face of the clamping column (5) are located on the same horizontal plane.

5. The pressure sensor welding equipment according to claim 1, characterized in that: The lower connecting cover (10) is fixed to the outside of the limiting cylinder (8), and the upper connecting cover (11) is fixed to the outside of the clamping column (5). The lower connecting cover (10) and the upper connecting cover (11) are threaded together.

6. The pressure sensor welding equipment according to claim 1, characterized in that: The welding mechanism includes an electric rotating ring (2) and a welding head (3). The electric rotating ring (2) is installed at the inner bottom end of the welding frame (1) and is coaxially arranged with the limiting seat (7). The welding head (3) is installed at the upper end of the electric rotating ring (2). The electric rotating ring (2) drives the welding head (3) to make a circular motion around the axis of the limiting seat (7).

7. The pressure sensor welding equipment according to claim 1, characterized in that: Both the upper and lower ends of the limiting cylinder (8) are chamfered inward.

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