Pressure sensor welding equipment

Abstract

The invention relates to a pressure sensor welding device applied to the field of pressure sensor machining, which comprises a welding rack, a welding mechanism and an auxiliary positioning mechanism, the auxiliary positioning mechanism comprises a pressing module and a fixing module, and the pressing module comprises a lifting driving device, a pressing column, a limiting cylinder and a pressing ring assembly; according to the scheme, through cooperative arrangement of the pressing column, the limiting cylinder, the pressing ring assembly and the limiting base, in the process that the lifting driving equipment drives the pressing column and the pressing ring assembly to synchronously press the film downwards, the edge of the film can be prevented from deforming, after the pressing ring assembly is separated in the later period, the pressure of the pressing column on the film is not changed, and the film is prevented from being damaged. Therefore, the edge of the thin film is still not deformed, the edge of the thin film and the edge of the thin film mounting base are in close seamless fit in the subsequent welding process, welding spots are smoother and lighter, the welding quality is improved, and damage to the pressure sensor is reduced.

Description

Technical Field

[0001] The present invention relates to a welding device, and in particular to a pressure sensor welding device applied to the field of pressure sensor processing. Background Art

[0002] As an important component of the pressure sensor, the thin-walled metal film plays the role of sensing the pressure to be measured, isolating the measured environment from the signal conversion structure inside the pressure sensor, etc. The welding quality of the thin-walled metal film in the pressure sensor is related to the performance and service life of the pressure sensor, and is one of the important core technologies of the pressure sensor processing technology.

[0003] The thin-walled metal film in the pressure sensor is connected to the sensor housing by welding. The current method is fusion welding. Generally, laser welding or electron beam welding with higher energy density and smaller heat input is selected. However, since the wall thickness of the thin-walled metal film currently used is only 0.02mm-0.04mm, welding is started from any position of the circumference to be welded during the welding process, and continuous welding is completed until the entire circle is welded and overlapped. As the welding progresses, the welding heat gradually accumulates on the circumference to be welded and forms a secondary welding heat input at the weld overlap position, resulting in uneven welding stress of the circumferential weld of the thin-walled metal film. After welding, local deformation and bending are prone to occur, which affects its working performance in the pressure sensor and causes the product to be unqualified. At the same time, when fusion welding this structure, it is necessary to assemble it first and fix it by positioning welding. Since the wall thickness of the thin-walled metal film is extremely small, the assembly positioning welding operation is difficult and the production efficiency is low.

[0004] In order to improve the above problems, after searching, the specification of patent application number CN202311448558.1 discloses a thin-walled metal film welding device and a welding method for a pressure sensor, wherein the welding device comprises an upper electrode and a lower electrode, and a pressure ring is provided on the lower end face of the upper electrode, and an annular boss is provided on the lower end face of the pressure ring for pressing the thin-walled metal film; a positioning ring for clamping and fixing the top of the sensor housing is provided on the bottom of the upper electrode; a clamping groove for clamping and fixing the bottom of the sensor housing is provided on the top of the lower electrode; 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 welder are provided inside the upper electrode and the lower electrode, thereby realizing one-time and integral welding of the circumferential weld between the thin-walled metal film and the sensor housing, eliminating continuous welding of the circumferential weld and secondary welding of the weld overlap position, improving the welding heat input process, and effectively avoiding the problem of local deformation and bending of the thin-walled metal film during the welding process.

[0005] However, the outer diameter of the pressure ring of the above-mentioned 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 bend upward, resulting in larger welds in the later stage. On the one hand, it will lead to extended welding time, which may easily lead to high-temperature burns and reduce the welding quality. On the other hand, the larger welds lead to poor welding aesthetics. Therefore, a pressure sensor welding device is proposed to improve the above-mentioned problems. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the outer diameter of the pressure ring of the above-mentioned pressure sensor welding equipment 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 bend upward, resulting in larger welds in the later stage. On the one hand, it will lead to an extension of the welding time, which may easily lead to high-temperature burns and reduce the welding quality. On the other hand, the larger welds result in poor welding aesthetics.

[0007] In order to solve the above problems, the present invention provides a pressure sensor welding device, including a welding frame, and also including: A welding mechanism, the welding mechanism is installed at the inner bottom end of the welding frame; The auxiliary positioning mechanism includes a pressing module and a fixing module, wherein the pressing module is located just above the fixing module; The pressing module includes a lifting drive device, a pressing column, a limiting cylinder and a pressing ring assembly; The lifting drive device is installed on the top of the welding frame, the clamping column is fixedly installed on the bottom output end of the lifting drive device, and the pressing ring assembly is installed on the bottom end of the clamping column; The fixing module includes a supporting seat and a limiting seat; The support seat is fixed to the inner bottom end of the welding frame, the limit seat is fixed to the top end of the support seat, and a limit groove is arranged at the upper end of the limit seat. The diameter of the limit groove and the outer diameter of the pressure ring assembly are consistent with the inner diameter of the limit cylinder.

[0008] In the above-mentioned pressure sensor welding equipment, the lower half of the film mounting seat can be placed on the inner side of the limiting seat through the coordinated arrangement of the clamping column, the limiting cylinder, the pressing ring assembly and the limiting seat, and then the limiting cylinder is sleeved on the outer side of the upper half of the film mounting seat, and then the film is placed on the upper end of the film mounting seat, and then the lifting drive device is used to drive the clamping column and the pressing ring assembly to synchronously descend to press the film downward, so that the film is pressed on the upper end of the film mounting seat, and then the limiting cylinder is separated from the film mounting seat, and then the pressing ring assembly is separated from the film, and the welding mechanism can be used to weld the edge of the film to the edge of the film mounting seat. Since the clamping column and the pressing ring assembly press down the film synchronously, deformation of the edge of the film can be avoided, and after the pressing ring assembly is separated later, the pressure of the clamping column on the film remains unchanged, so the edge of the film will still not be deformed, so that the edge of the film and the edge of the film mounting seat are close to seamless fit during the welding process, making the welding point smoother and lighter, improving the welding quality, and reducing the damage to the pressure sensor.

[0009] As a further supplement to the present application, a chamfer is provided at the notch of the limiting groove, so that the film mounting seat has a certain fault tolerance when being inserted, which facilitates the smooth insertion of the film mounting seat.

[0010] As a further supplement to the present application, the pressure ring assembly includes a connecting ring, which is threadedly connected to the surface of the clamping column, and the circumferential side of the connecting ring is provided with vertical anti-slip grooves; the clamping column and the pressure ring assembly are driven to descend synchronously by a lifting drive device to press the film down until the film is pressed against the upper end of the film mounting seat, and then the connecting ring is rotated to move the connecting ring upward relative to the clamping column, thereby separating 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 seat to avoid welding the connecting ring and the film together; the vertical anti-slip grooves on the circumferential side of the connecting ring facilitate the operator to rotate the connecting ring.

[0011] As a further supplement to the present application, the pressure ring assembly also includes a movable ring, which is horizontally rotatably installed 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 due to the relatively small friction force between the movable ring and the film, but moves up synchronously with the connecting ring. Compared with the direct contact between the connecting ring and the film, the provision of the movable ring can reduce the friction damage to the film.

[0012] As a further supplement to the present application, a limiting convex ring is integrally provided on the surface of the clamping column, and an annular limiting groove cooperating with the limiting convex ring is provided on the inner wall of the connecting ring, and the height of the annular limiting groove is greater than the thickness of the limiting convex ring; the limiting convex ring cooperates with the annular limiting groove to limit the connecting ring to prevent the connecting ring from detaching from the clamping column.

[0013] As a further supplement to the present application, when the connecting ring is rotated downward to a state where it cannot rotate, the lower end surface of the movable ring and the lower end surface of the clamping column are located on the same horizontal plane; this can ensure that the lifting drive device drives the clamping column and the pressure ring assembly to descend synchronously to press the film against the upper end of the film mounting seat, thereby maintaining the flatness of the film surface.

[0014] As a further supplement to the present 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 clamping column, and the lower connecting cover is threadedly connected to the upper connecting cover; after the film is clamped, the lower connecting cover is threadedly connected to the upper connecting cover to facilitate the fixed storage of the limiting cylinder.

[0015] As a further supplement to the present application, the welding mechanism includes an electric swivel and a welding head. The electric swivel is installed at the inner bottom end of the welding frame, and the electric swivel is coaxially arranged with the limit seat. The welding head is installed at the upper end of the electric swivel. The electric swivel drives the welding head to perform circular motion around the axis of the limit seat.

[0016] As a further supplement to the present application, both the upper and lower ends of the limit cylinder are provided with inward chamfers. The inward chamfer provided at the upper end of the limit cylinder can make the pressure ring assembly have a certain tolerance during the downward movement, and the downward movement is smoother. The inward chamfer provided at the lower end of the limit cylinder can make the limit cylinder have a certain tolerance during the process of being sleeved on the outer side of the film mounting seat, and the sleeved connection is smoother.

[0017] In summary, through the coordinated arrangement of the clamping column, the limiting cylinder, the pressing ring assembly and the limiting seat, the lower half of the film mounting seat can be placed on the inner side of the limiting seat, and then the limiting cylinder is sleeved on the outer side of the upper half of the film mounting seat, and then the film is placed on the upper end of the film mounting seat, and then the lifting drive device is used to drive the clamping column and the pressing ring assembly to descend synchronously to press the film downward, so that the film is pressed against the upper end of the film mounting seat, and then the limiting cylinder is separated from the film mounting seat, and the lower connecting cover is threadedly connected to the upper connecting cover to facilitate the fixed storage of the limiting cylinder; then the connecting ring is rotated so that the connecting ring brings the movable ring to move upward relative to the clamping column, thereby realizing separation from the film, avoiding welding the movable ring to the film, and rotating the connecting ring When the film is welded, the movable ring is not easy to rotate under the relatively small friction force between the movable ring and the film, but moves up synchronously with the connecting ring. Compared with the direct contact between the connecting ring and the film, the movable ring can reduce the friction damage to the film. Thereafter, the edge of the film and the edge of the film mounting seat can be welded by the welding mechanism. Since the clamping column and the pressing ring assembly press down the film synchronously, the deformation of the edge of the film can be avoided. After the pressing ring assembly is separated later, the pressure of the clamping column on the film remains unchanged, so the edge of the film will not be deformed. During the welding process, the edge of the film and the edge of the film mounting seat are almost seamlessly fitted, making the welding point smoother and lighter, improving the welding quality, and reducing the damage to the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure in an unassembled state in the first embodiment of the present application; Figure 2 This is a schematic diagram of the overall three-dimensional structure in the assembled state in the first embodiment of the present application; Figure 3 It is a partial three-dimensional structural schematic diagram of the auxiliary positioning mechanism of the first embodiment of the present application; Figure 4 This is a schematic cross-sectional structure diagram of the pressing module in the first embodiment of the present application; Figure 5 This is a schematic diagram of the planar structure in which the limiting cylinder is sleeved on the outer side of the upper half of the film mounting seat in the first embodiment of the present application; Figure 6 This is a schematic diagram of the planar structure of the pressing module in the first embodiment of the present application in the pressing state; Figure 7 This is a schematic diagram of the planar structure of the first embodiment of the present application in a state where the limiting cylinder is fixedly stored; Figure 8 This is a schematic diagram of the planar structure of the pressure ring assembly and the film in the first embodiment of the present application when they are separated.

[0019] Description of the numbers in the figure: 1. Welding frame; 2. Electric swivel; 3. Welding head; 4. Lifting drive device; 5. Clamping column; 501. Limiting convex 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 DESCRIPTION

[0020] An implementation method of the present application is described in detail below with reference to the accompanying drawings.

[0021] The first implementation method: The present invention provides a pressure sensor welding device, please refer to Figure 1-8 , including a welding frame 1, a welding mechanism and an auxiliary positioning mechanism.

[0022] The welding mechanism is installed at the inner bottom end of the welding frame 1, specifically, as Figure 1 and Figure 2 As shown, the welding mechanism includes an electric swivel 2 and a welding head 3 . The electric swivel 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 swivel 2 .

[0023] Regarding the auxiliary positioning mechanism, specifically, Figure 1 and Figure 2As shown, the auxiliary positioning mechanism includes a pressing module and a fixing module. The pressing module is located directly above the fixing module. Regarding the pressing module, more specifically, the pressing module includes a lifting drive device 4, a clamping column 5, a limiting cylinder 8 and a pressing 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 pressing ring assembly 9 is installed at the bottom end of the clamping column 5. The fixing module includes a supporting seat 6 and a limiting seat 7. The supporting seat 6 is fixed to the inner bottom end of the welding frame 1, and the limiting seat 7 is fixed to the top of the supporting seat 6. A limiting groove is set at the upper end of the limiting seat 7. The diameter of the limiting groove and the outer diameter of the pressing ring assembly 9 are consistent with the inner diameter of the limiting cylinder 8.

[0024] The electric swivel 2 is coaxially arranged with the limiting seat 7 , and the electric swivel 2 drives the welding head 3 to perform circular motion around the axis of the limiting seat 7 .

[0025] The pressure sensor welding equipment can place the lower half of the film mounting seat on the inner side of the limiting seat 7 through the coordinated arrangement of the clamping column 5, the limiting cylinder 8, the pressing ring assembly 9 and the limiting seat 7, and then the limiting cylinder 8 is sleeved on the outer side of the upper half of the film mounting seat, and then the film is placed on the upper end of the film mounting seat, and then the lifting drive device 4 is used to drive the clamping column 5 and the pressing ring assembly 9 to synchronously descend to press the film, so that the film is pressed on the upper end of the film mounting seat, and then the limiting cylinder 8 is separated from the film mounting seat, and then the pressing ring assembly 9 is separated from the film, and the welding mechanism can be used to weld the edge of the film to the edge of the film mounting seat, because the clamping column 5 and the pressing ring assembly 9 synchronously press the film, deformation of the edge of the film can be avoided, and after the pressing ring assembly 9 is separated at a later stage, the pressure of the clamping column 5 on the film remains unchanged, so the edge of the film will still not be deformed, so that the edge of the film and the edge of the film mounting seat are close to seamless fit during the welding process, making the welding point smoother and lighter, improving the welding quality, and reducing the damage to the pressure sensor.

[0026] Among them, Figure 4 As shown, the pressure ring assembly 9 includes a connecting ring 91, which is threadedly connected to the surface of the clamping column 5, and the circumference of the connecting ring 91 is provided with vertical anti-slip grooves. The vertical anti-slip grooves on the circumference of the connecting ring 91 facilitate the operator to rotate the connecting ring 91.

[0027] Based on the coordinated setting of the above structure, the lifting drive device 4 is used to drive the clamping column 5 and the pressure ring assembly 9 to descend synchronously to press the film down until the film is pressed against the upper end of the film mounting seat, and then the connecting ring 91 is rotated to make the connecting ring 91 move upward relative to the clamping column 5, thereby achieving separation 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 seat to avoid welding the connecting ring 91 and the film together.

[0028] 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 .

[0029] Based on the matching arrangement of the above structure, 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 due to the relatively small friction force between the movable ring 92 and the film, but moves up synchronously with the connecting ring 91. Compared with the direct contact between the connecting ring 91 and the film, the movable ring 92 can reduce the friction damage to the film.

[0030] Among them, Figure 4 It is shown that a limiting convex ring 501 is integrally provided on the surface of the clamping column 5, and an annular limiting groove 9101 which cooperates with the limiting convex ring 501 is provided on the inner wall of the connecting ring 91, and the height of the annular limiting groove 9101 is greater than the thickness of the limiting convex ring 501; the limiting convex ring 501 cooperates with the annular limiting groove 9101 to limit the connecting ring 91 to prevent the connecting ring 91 from separating from the clamping column 5.

[0031] As a further limitation, when the connecting ring 91 is rotated downward to a state where it cannot rotate, the lower end surface of the movable ring 92 and the lower end surface of the clamping column 5 are located on the same horizontal plane; this can ensure that the lifting drive device 4 drives the clamping column 5 and the pressure ring assembly 9 to descend synchronously to press the film against the upper end of the film mounting seat, thereby maintaining the flatness of the film surface.

[0032] Among them, a lower connecting cover 10 is fixed to the outside of the limiting cylinder 8, and an upper connecting cover 11 is fixed to the outside of the clamping column 5, and the lower connecting cover 10 is threadedly connected to the upper connecting cover 11; after clamping the film, the lower connecting cover 10 is threadedly connected to the upper connecting cover 11 to facilitate the fixed storage of the limiting cylinder 8.

[0033] Among them, Figure 3 It is shown that the notch of the limiting groove is provided with a chamfer, so that the film mounting seat has a certain fault tolerance when being inserted, which facilitates the smooth insertion of the film mounting seat.

[0034] Similarly, both the upper and lower ends of the limit cylinder 8 are chamfered inwardly. The inward chamfer set at the upper end of the limit cylinder 8 can make the pressure ring assembly 9 have a certain tolerance during the downward movement, and the downward movement is smoother. The inward chamfer set at the lower end of the limit cylinder 8 can make the limit cylinder 8 have a certain tolerance during the process of being sleeved on the outer side of the film mounting seat, and the sleeved connection is smoother.

[0035] Working principle: When using, first assemble it. The specific operations are as follows: like Figure 5 As shown, the lower half of the film mounting seat is placed inside the limiting seat 7; Then, the limiting cylinder 8 is placed on the outer side of the upper half of the film mounting seat; Then placing the film on the upper end of the film mounting seat; Rotate the connecting ring 91 so that the connecting ring 91 moves downward to a state where it cannot rotate (at this time, the lower end surface of the movable ring 92 and the lower end surface of the pressing column 5 are located 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 to press the film against the upper end of the film mounting seat, thereby maintaining the flatness of the film surface); Then carry out compaction and positioning, the specific operations are as follows: like Figure 6 As shown, the lifting drive device 4 is used to drive the pressing column 5 and the pressing ring assembly 9 to descend synchronously to press the film downward, so that the film is pressed against the upper end of the film mounting seat; like Figure 7 As shown, the limiting cylinder 8 is then separated from the film mounting seat, and the lower connecting cover 10 is threadedly connected to the upper connecting cover 11 to facilitate the fixing and storage of the limiting cylinder 8; like Figure 8 As shown, the connecting ring 91 is then rotated so that the connecting ring 91 moves upward with the movable ring 92 relative to the pressing column 5, thereby separating 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 friction between the film and the connecting ring 91, but moves upward synchronously with the connecting ring 91. Compared with the direct contact between the connecting ring 91 and the film, the movable ring 92 can reduce the friction damage to the film). After that, the welding mechanism can be used to weld the edge of the film to the edge of the film mounting seat (because the clamping column 5 and the pressure ring assembly 9 press down on the film synchronously, deformation of the edge of the film can be avoided, and 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 still does not deform, so that the edge of the film and the edge of the film mounting seat are almost seamlessly fitted during the welding process, making the weld smoother and lighter, improving the welding quality, and reducing damage to the pressure sensor).

[0036] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A pressure sensor welding device, comprising a welding frame (1), characterized in that: Also includes: A welding mechanism, the welding mechanism being mounted on the inner bottom end of the welding frame (1); An auxiliary positioning mechanism, the auxiliary positioning mechanism comprising a pressing module and a fixing module, the pressing module being located just above the fixing module; The pressing module comprises a lifting drive device (4), a pressing column (5), a limiting cylinder (8) and a pressing ring assembly (9); The lifting drive device (4) is installed on 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 pressing ring assembly (9) is installed on the bottom end of the clamping column (5); The fixing module comprises a supporting seat (6) and a limiting seat (7); The support seat (6) is fixed to the inner bottom end of the welding frame (1), and the limit seat (7) is fixed to the top end of the support seat (6). A limit groove is provided at the upper end of the limit seat (7), and the diameter of the limit groove and the outer diameter of the pressure ring assembly (9) are consistent with the inner diameter of the limit cylinder (8).

2. A pressure sensor welding device according to claim 1, characterized in that: The notch of the limiting groove is provided with a chamfer.

3. A pressure sensor welding device according to claim 1, characterized in that: The pressure ring assembly (9) comprises a connecting ring (91), the connecting ring (91) being threadedly connected to the surface of the pressing column (5), and vertical anti-slip grooves are arranged on the circumference of the connecting ring (91).

4. A pressure sensor welding device according to claim 3, characterized in that: The pressure ring assembly (9) further comprises a movable ring (92), wherein the movable ring (92) is horizontally rotatably mounted on the bottom end of the connecting ring (91).

5. A pressure sensor welding device according to claim 4, characterized in that: A limiting convex 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) for limiting cooperation with the limiting convex ring (501), wherein the height of the annular limiting groove (9101) is greater than the thickness of the limiting convex ring (501).

6. A pressure sensor welding device according to claim 5, characterized in that: When the connecting ring (91) is rotated downwards to a state where it cannot rotate, the lower end surface of the movable ring (92) and the lower end surface of the pressing column (5) are located on the same horizontal plane.

7. The pressure sensor welding device according to claim 1, characterized in that: A lower connection cover (10) is fixed to the outer side of the limiting cylinder (8), an upper connection cover (11) is fixed to the outer side of the pressing column (5), and the lower connection cover (10) is threadedly connected to the upper connection cover (11).

8. The pressure sensor welding device according to claim 1, characterized in that: The welding mechanism comprises an electric swivel (2) and a welding head (3); the electric swivel (2) is mounted on the inner bottom end of the welding frame (1), and the electric swivel (2) is coaxially arranged with the limit seat (7); the welding head (3) is mounted on the upper end of the electric swivel (2); and the electric swivel (2) drives the welding head (3) to perform circular motion around the axis of the limit seat (7).

9. The pressure sensor welding device according to claim 1, characterized in that: The upper and lower ends of the limiting cylinder (8) are both provided with inward chamfers.

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