Laser welding device for machining pressure instrument and welding method of laser welding device

Abstract

The invention discloses a laser welding device for machining a pressure instrument and a welding method of the laser welding device, and relates to the technical field of instrument welding, the laser welding device comprises a fixing mechanism and a laser welding mechanism, the fixing mechanism is used for fixing the instrument for welding positioning, and a servo motor is arranged at the top end of the laser welding mechanism; the output end of the servo motor is in transmission connection with a range adjusting mechanism, the servo motor is in transmission connection with a bending plate through the range adjusting mechanism, the range adjusting mechanism is connected with one end of the bending plate, the other end of the bending plate is bent downwards to form an inclined plate, and the laser welding mechanism is connected to the lower surface of the inclined plate through screws. And the servo motor drives the laser welding mechanism to do circular motion around the shaft through the bending plate. The laser welding mechanism is obliquely installed through the bending plate, the angle of the transmission shaft can be adjusted, plane welding seams on the upper and lower surfaces of the pressure instrument and vertical welding seams on the side face are compatible, and the problem of uneven melt caused by traditional single-angle welding is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument welding, in particular to a laser welding device and a welding method for processing a pressure instrument. Background Art

[0002] Laser welding of pressure instruments is a precision welding technology that uses a high-energy-density laser beam as a heat source to rapidly melt and fuse instrument components locally. Laser welding offers high welding speeds and a small heat-affected zone, preventing component deformation and performance damage. It enables precise welding of tiny structures, resulting in high weld strength and excellent sealing, meeting the stringent reliability and corrosion resistance requirements of pressure instruments.

[0003] However, existing pressure gauge welding and positioning techniques primarily involve two steps. The first involves laser welding the upper and lower surfaces of the gauge, such as welding the upper and lower panels of the housing. Because the workpieces are nearly flat, the laser facing the upper surface evenly distributes energy to both sides of the weld, melting the solder and filling the weld evenly. The second involves side welding of the gauge, such as welding pressure fittings. In these situations, the two workpieces are nearly perpendicular. If the laser welding mechanism faces a single plane, uneven solder melting can occur. Misaligned workpieces struggle to effectively contact the solder, resulting in a weak weld. Summary of the Invention

[0004] The object of the present invention is to provide a laser welding device and a welding method for processing a pressure instrument, so as to solve the problems raised by the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a laser welding device for processing pressure instruments, comprising a fixing mechanism and a laser welding mechanism, the fixing mechanism being used to fix the instrument for welding positioning, a servo motor being provided at the top of the laser welding mechanism, the output end of the servo motor being transmission-connected to a range adjustment mechanism, the servo motor being transmission-connected to a bending plate through the range adjustment mechanism, the range adjustment mechanism being connected to one end of the bending plate, the other end of the bending plate being bent downward to form an inclined plate, the laser welding mechanism being connected to the lower surface of the inclined plate through screws, the servo motor driving the laser welding mechanism to perform circular motion around the axis through the bending plate; The range adjustment mechanism includes a transmission shaft 1 and a transmission shaft 2. The transmission shaft 2 is fixedly connected to the output end of the servo motor. The transmission shaft 1 is detachably connected to the upper surface of the bending plate by screws. The outer wall of the transmission shaft 2 is rotatably connected to the positioning seat 2. A positioning seat 1 is provided on the outer side of the transmission shaft 1. The inner wall of the positioning seat 1 is fixedly connected to a guide rail. The positioning seat 1 is slidably connected to a slider through the guide rail. The transmission shaft 1 is rotatably connected to the slider. One end of the transmission shaft 1 is connected to the coupling 1, and one end of the transmission shaft 2 is connected to the coupling 2. The coupling 1 and the coupling 2 are transmission-connected. The range adjustment mechanism is used to adjust the center point of the circular motion of the laser welding mechanism.

[0006] Preferably, the bottom end of positioning seat one is fixedly connected to gear one, the bottom end of positioning seat two is fixedly connected to gear two, gear one and gear two are meshed with each other, the bottom ends of positioning seat one and positioning seat two are transmission-connected with a connecting rod, the length of the connecting rod is equal to the sum of the outer diameters of gear one and gear two, and fastening screws are respectively installed at both ends of the connecting rod, and the connecting rod is locked and positioned with positioning seat one and positioning seat two through the fastening screws.

[0007] Preferably, one end of the coupling 1 is fixedly connected to a telescopic column, one end of the coupling 2 is fixedly connected to a telescopic cylinder, an inner side wall of the telescopic cylinder is connected to a flat key, and the telescopic cylinder and the telescopic column are slidably connected.

[0008] Preferably, the laser welding mechanism includes a machine base, a laser welding body and a feeding mechanism. The laser welding body is installed on one side of the machine base. The machine base is detachably connected to the inclined plate of the bending plate by screws. The top of the laser welding body is connected to the feeding mechanism, which is used for laser welding to supplement solder.

[0009] Preferably, a mounting seat is installed at the bottom end of the servo motor, and a lug plate is installed on the side wall of the mounting seat, and the servo motor is installed on the gantry through the mounting seat.

[0010] Preferably, the fixing mechanism includes a fixed disk and a turntable, a limiting groove 1 is provided on the surface of the fixed disk, and a limiting groove 2 is provided on the surface of the turntable, the limiting groove 1 and the limiting groove 2 are arranged alternately, a sliding rod is slidably connected inside the limiting groove 1, one end of the sliding rod is fixedly connected to the limiting column, and the other end of the sliding rod is fixedly connected to a clamping claw, the limiting column is slidably connected to the inner side wall of the limiting groove 2, and the turntable is rotatably connected to the side wall of the fixed disk.

[0011] Preferably, the bottom end of the fixed disk is connected to a base, the base is rotatably connected to an electric cylinder, the output end of the electric cylinder is fixedly connected to a screw, the outer wall of the screw is threadedly connected to a threaded seat, the top of the threaded seat is rotatably connected to a connecting seat, and the connecting seat is fixedly connected to the turntable.

[0012] The present invention also discloses a laser welding method for processing pressure instruments, which is divided into two operating processes: shell sealing welding and pressure joint sealing welding. The shell sealing welding position is on the upper and lower surfaces of the pressure instrument, and the pressure joint sealing welding position is on the side wall of the pressure instrument. By adjusting the facing position of the pressure instrument and the laser welding mechanism, laser welding processing at different positions is realized. By adjusting the relative positions of transmission shaft one and transmission shaft two, alignment with the pressure surface welding is achieved. By replacing bending plates of different sizes, adaptive adjustment of the surrounding radius of the laser welding mechanism is achieved.

[0013] Preferably, the welding method is divided into the following steps: Step 1: Place the pressure instrument parts in the fixing mechanism and bring the four clamping jaws close to each other to achieve clamping and fixing; Step 2: Loosen the fastening screws under the connecting rod, adjust the angle between gear 1 and gear 2, make the transmission shaft 1 parallel to the corresponding plane of the weld, and then tighten the screws to position it; Step 3: Adjust the position of the mounting seat on the gantry and the position of the slider on the positioning seat 1 so that the transmission shaft 1 is aligned with the center of the circular weld; Step 4: drive the servo motor to drive the laser welding mechanism to rotate around the weld seam, and at the same time start the laser welding mechanism to perform laser welding operation on the weld seam.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the laser welding mechanism and the adjustable transmission shaft angle are installed by tilting the bending plate, which is compatible with the flat welds on the upper and lower surfaces of the pressure instrument and the vertical welds on the side, avoiding the problem of uneven melt caused by traditional single-angle welding.

[0015] 2. In the present invention, the lateral adjustment of the gantry is combined with the fine adjustment of the positioning seat slider to achieve millimeter-level alignment between the center of the laser trajectory and the center of the weld. Combined with the transmission angle adjustment of gear one and gear two, it is ensured that the laser incident direction accurately matches the weld plane.

[0016] 3. In the present invention, the electric cylinder drives the jaws to move telescopically, realizing the closing and opening of the four sets of jaws, effectively shortening the clamping time. The screw can also be manually calibrated to eliminate mechanical clearance and ensure the coaxiality of the clamping. At the same time, the elastic jaws can avoid surface damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of a laser welding device for processing a pressure instrument according to the present invention; Figure 2 This is a structural schematic diagram of a laser welding mechanism in a laser welding device for processing a pressure instrument according to the present invention; Figure 3 This is a structural schematic diagram of a range adjustment mechanism in a laser welding device for processing a pressure instrument according to the present invention; Figure 4 This is a schematic diagram illustrating the principle of translation adjustment of a transmission shaft in a laser welding device for processing a pressure instrument according to the present invention; Figure 5 This is a schematic diagram illustrating the principle of adjusting the angle of a transmission shaft in a laser welding device for processing a pressure instrument according to the present invention; Figure 6 This is a schematic diagram of the structure of the fixing mechanism in a laser welding device for processing pressure instruments of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the structure of the fixing mechanism in a laser welding device for processing pressure instruments of the present invention. Figure 2 .

[0018] In the figure: 1. servo motor; 2. mounting seat; 21. ear plate; 3. range adjustment mechanism; 31. positioning seat 1; 311. slider; 312. guide rail; 32. transmission shaft 1; 33. gear 1; 34. gear 2; 35. coupling 1; 36. coupling 2; 37. transmission shaft 2; 370. positioning seat 2; 38. telescopic cylinder; 39. telescopic column; 4. bending plate; 5. fixing mechanism; 51. fixing plate; 510. limiting groove 1; 52. clamping claw; 53. sliding rod; 54. electric cylinder; 55. connecting seat; 56. screw; 57. threaded seat; 58. turntable; 580. limiting groove 2; 59. limiting column; 6. laser welding mechanism; 61. machine base; 62. laser welding body; 63. feeding mechanism. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Example 1: Reference Figure 1-7 As shown: A laser welding device for processing pressure instruments, including a fixing mechanism 5 and a laser welding mechanism 6, the fixing mechanism 5 is used to fix the instrument for welding positioning, a servo motor 1 is provided at the top of the laser welding mechanism 6, the output end of the servo motor 1 is connected to the range adjustment mechanism 3, the servo motor 1 is connected to the bending plate 4 through the range adjustment mechanism 3, the range adjustment mechanism 3 is connected to one end of the bending plate 4, the other end of the bending plate 4 is bent to form an inclined plate, the laser welding mechanism 6 is connected to the lower surface of the inclined plate by screws, the servo motor 1 drives the laser welding mechanism 6 to do circular motion around the axis through the bending plate 4; the range adjustment mechanism 3 includes a transmission shaft 1 32 and a transmission shaft 2 37, the transmission shaft 2 37 is fixedly connected to the output end of the servo motor 1, the transmission shaft 1 32 is detachably connected to the upper surface of the bending plate 4 by screws, the outer wall of the transmission shaft 2 37 is rotatably connected to the positioning seat 2 370, the outer side of the transmission shaft 1 32 is provided with a positioning seat 1 31, the inner wall of the positioning seat 1 31 is fixedly connected to the guide rail 312, the positioning seat 1 31 is slidably connected to the slider 311 through the guide rail 312, the transmission shaft 1 32 is rotatably connected to the slider 311, one end of the transmission shaft 1 32 is connected to the coupling 1 35, one end of the transmission shaft 2 37 is connected to the coupling 2 36, the coupling 1 35 and the coupling 2 36 are transmission connected, and the range adjustment mechanism 3 is used to adjust the center point of the circular motion of the laser welding mechanism 6.

[0021] In this embodiment, the welding positioning of the pressure instrument is roughly divided into two parts. One is the laser welding of the upper and lower surfaces of the instrument, such as the welding of the upper and lower surface plates of the shell, and the other is the laser welding of the side of the instrument, such as the welding of the pressure joint. When welding the upper and lower surfaces, since the two workpieces to be welded are almost on the same plane, the laser is facing the upper surface of the instrument, which can completely and evenly emit laser energy on both sides of the weld, so that the solder melts and evenly fills the two workpieces. When welding the side of the instrument, the two workpieces to be welded are almost in a vertical state. At this time, if the laser welding mechanism 6 is facing one of the planes, the solder will be unevenly melted, and the workpiece that is not targeted by the laser welding mechanism 6 will not effectively contact the solder, resulting in a weak welding effect. A bending plate 4 is provided below the servo motor 1, one end of which is bent downward, and a laser welding mechanism 6 is mounted on the bending bevel of the bending plate 4. This allows the direction of the laser energy emitted by the laser welding mechanism 6 to be at a certain angle to the weld trajectory. When the two planes are in the same plane, a certain amount of laser energy can be applied to the two workpieces so that both workpieces can contact the solder to achieve a fixing effect. For welding on the side of the instrument, the pressure joint is almost perpendicular to the side wall, but the laser welding mechanism 6 is located within the range between the verticals. Both planes can receive the laser energy in the inclined direction. In this state, the two workpieces can also be effectively welded and fixed. For welding and fixing at different positions of the pressure instrument, the radius of the center weld is different, and bending plates 4 of various sizes can be provided. Bending plates 4 with a longer rotation radius are suitable for welding the upper and lower surfaces of the pressure instrument, and bending plates 4 with a shorter rotation radius are suitable for side welding of the pressure instrument. Bending plates 4 with a larger bending angle are suitable for side welding of the pressure instrument, and bending plates 4 with a smaller bending angle are suitable for welding the upper and lower surfaces of the pressure instrument.

[0022] Example 2: Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the bottom end of positioning seat 1 31 is fixedly connected to gear 1 33, and the bottom end of positioning seat 2 370 is fixedly connected to gear 2 34. Gear 1 33 and gear 2 34 mesh with each other. The bottom ends of positioning seat 1 31 and positioning seat 2 370 are connected by a connecting rod. The length of the connecting rod is equal to the sum of the outer diameters of gear 1 33 and gear 2 34. Fastening screws are installed at each end of the connecting rod. The connecting rod is locked and positioned with positioning seat 1 31 and positioning seat 2 370 via the fastening screws. One end of coupling 1 35 is fixedly connected to telescopic column 39, and one end of coupling 2 36 is fixedly connected to telescopic cylinder 38. The inner wall of telescopic cylinder 38 is connected to a flat key. Telescopic cylinder 38 and telescopic column 39 are slidably connected.

[0023] The laser welding mechanism 6 comprises a base 61, a laser welding body 62, and a loading mechanism 63. The laser welding body 62 is mounted on one side of the base 61. The base 61 is detachably connected to the inclined plate of the bending plate 4 via screws. The top of the laser welding body 62 is connected to the loading mechanism 63, which is used to replenish solder during laser welding. The servo motor 1 is mounted on the gantry via the mounting base 2, which is mounted on the bottom end of the servo motor 1. The sidewalls of the mounting base 2 are mounted with lugs 21.

[0024] In this embodiment, in order to align the rotation trajectory of the laser welding mechanism 6 with the circular weld, the position of the mounting seat 2 is adjusted on the gantry to achieve adjustment of the X-axis direction of the rotation trajectory, and the position of the slider 311 is adjusted in the positioning seat 1 31 to achieve adjustment of the X-axis direction of the rotation trajectory until the center of the rotation trajectory coincides with the circle of the circular weld, thereby improving the welding accuracy. In order to adapt to welding on different planes, the angles of the transmission shaft 1 32 and the telescopic cylinder 38 can be relatively adjusted, and the relative angle of the transmission shaft 1 32 can be adjusted by adjusting the meshing angle of the gear 1 33 and the gear 2 34, and then locked and fixed by the connecting rod.

[0025] Example 3: According to Figure 6 and Figure 7 As shown, the fixing mechanism 5 includes a fixed disk 51 and a rotating disk 58. The surface of the fixed disk 51 is provided with a first limiting groove 510, and the surface of the rotating disk 58 is provided with a second limiting groove 580. The first limiting groove 510 and the second limiting groove 580 are arranged in an alternating manner. A sliding rod 53 is slidably connected to the interior of the first limiting groove 510. One end of the sliding rod 53 is fixedly connected to a limiting post 59, and the other end of the sliding rod 53 is fixedly connected to a clamping claw 52. The limiting post 59 is slidably connected to the inner side wall of the second limiting groove 580. The rotating disk 58 is rotatably connected to the side wall of the fixed disk 51. The bottom end of the fixed disk 51 is connected to a base, and an electric cylinder 54 is rotatably connected to the base. The output end of the electric cylinder 54 is fixedly connected to a screw 56. The outer wall of the screw 56 is threadedly connected to a threaded seat 57. The top end of the threaded seat 57 is rotatably connected to a connecting seat 55, and the connecting seat 55 is fixedly connected to the rotating disk 58.

[0026] In this embodiment, the fixing mechanism 5 is used to realize the positioning of the pressure instrument. The connecting seat 55 is driven to move by the electric cylinder 54, so that the turntable 58 and the fixed plate 51 rotate relative to each other. Since the limit groove 1 510 and the limit groove 2 580 are staggered with each other, the staggered point moves accordingly after the turntable 58 rotates, and the position of the sliding rod 53 in the limit groove 1 510 will change, thereby realizing the action of the four jaws 52 to retract inward or expand outward, which is convenient for clamping and positioning the internal objects. At the same time, the screw 56 can also be manually rotated to adjust the position of the threaded seat 57 relative to the output end of the electric cylinder 54, thereby realizing the calibration of the electric cylinder 54.

[0027] Example 4: According to Figure 1-7 As shown, a laser welding method for processing a pressure instrument comprises the following steps: Step 1: Place the pressure instrument parts in the fixing mechanism 5 and make the four clamping jaws 52 move closer to each other to achieve clamping and fixing; Step 2: Loosen the fastening screws under the connecting rod, adjust the angle between gear 1 33 and gear 2 34 so that the transmission shaft 1 32 is parallel to the corresponding plane of the weld, and then tighten the screws to position it; Step 3: Adjust the position of the mounting seat 2 on the gantry and the position of the slider 311 on the positioning seat 1 31 so that the transmission shaft 1 32 is aligned with the center of the circular weld; Step 4: driving the servo motor 1 to drive the laser welding mechanism 6 to rotate around the weld seam, and at the same time starting the laser welding mechanism 6 to perform laser welding on the weld seam.

[0028] The laser welding method is divided into two operating processes: shell sealing welding and pressure joint sealing welding. The shell sealing welding position is on the upper and lower surfaces of the pressure instrument, and the pressure joint sealing welding position is on the side wall of the pressure instrument. By adjusting the facing position of the pressure instrument and the laser welding mechanism 6, laser welding processing at different positions is realized. By adjusting the relative position of the transmission shaft 1 32 and the transmission shaft 2 37, alignment with the pressure surface welding is achieved. By replacing the bending plate 4 of different sizes, adaptive adjustment of the surrounding radius of the laser welding mechanism 6 is achieved.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laser welding device for processing a pressure instrument, comprising a fixing mechanism (5) and a laser welding mechanism (6), wherein the fixing mechanism (5) is used to fix the instrument for welding positioning, and is characterized in that: A servo motor (1) is provided at the top of the laser welding mechanism (6), the output end of the servo motor (1) is connected to the range adjustment mechanism (3), the servo motor (1) is connected to the bending plate (4) through the range adjustment mechanism (3), the range adjustment mechanism (3) is connected to one end of the bending plate (4), the other end of the bending plate (4) is bent downward to form an inclined plate, the laser welding mechanism (6) is connected to the lower surface of the inclined plate through screws, and the servo motor (1) drives the laser welding mechanism (6) to perform circular motion around the axis through the bending plate (4); The range adjustment mechanism (3) includes a transmission shaft 1 (32) and a transmission shaft 2 (37), wherein the transmission shaft 2 (37) is fixedly connected to the output end of the servo motor (1), the transmission shaft 1 (32) is detachably connected to the upper surface of the bending plate (4) by screws, the outer wall of the transmission shaft 2 (37) is rotatably connected to the positioning seat 2 (370), the outer side of the transmission shaft 1 (32) is provided with a positioning seat 1 (31), and the inner side wall of the positioning seat 1 (31) is fixedly connected to the guide rail (31 2), the positioning seat 1 (31) is slidably connected to the slider (311) through the guide rail (312), the transmission shaft 1 (32) is rotationally connected to the slider (311), one end of the transmission shaft 1 (32) is connected to the coupling 1 (35), one end of the transmission shaft 2 (37) is connected to the coupling 2 (36), the coupling 1 (35) and the coupling 2 (36) are transmission-connected, and the range adjustment mechanism (3) is used to adjust the center point of the circular motion of the laser welding mechanism (6).

2. The laser welding device for processing a pressure instrument according to claim 1, characterized in that: The bottom end of the positioning seat 1 (31) is fixedly connected to the gear 1 (33), and the bottom end of the positioning seat 2 (370) is fixedly connected to the gear 2 (34). The gear 1 (33) and the gear 2 (34) are meshed with each other. The bottom ends of the positioning seat 1 (31) and the positioning seat 2 (370) are connected to a connecting rod in a transmission manner. The length of the connecting rod is equal to the sum of the outer diameters of the gear 1 (33) and the gear 2 (34). Fastening screws are respectively installed at both ends of the connecting rod. The connecting rod is locked and positioned with the positioning seat 1 (31) and the positioning seat 2 (370) through the fastening screws.

3. The laser welding device for processing a pressure instrument according to claim 2, characterized in that: One end of the coupling (35) is fixedly connected to a telescopic column (39), one end of the coupling (36) is fixedly connected to a telescopic cylinder (38), an inner side wall of the telescopic cylinder (38) is connected to a flat key, and the telescopic cylinder (38) and the telescopic column (39) are slidably connected.

4. The laser welding device for processing a pressure instrument according to claim 3, characterized in that: The laser welding mechanism (6) includes a machine base (61), a laser welding body (62) and a feeding mechanism (63). The laser welding body (62) is installed on one side of the machine base (61). The machine base (61) is detachably connected to the inclined plate of the bending plate (4) through screws. The top end of the laser welding body (62) is connected to the feeding mechanism (63). The feeding mechanism (63) is used for laser welding to supplement solder.

5. The laser welding device for processing a pressure instrument according to claim 4, characterized in that: The bottom end of the servo motor (1) is provided with a mounting seat (2), a side wall of the mounting seat (2) is provided with an ear plate (21), and the servo motor (1) is installed on the gantry through the mounting seat (2).

6. The laser welding device for processing a pressure instrument according to claim 5, characterized in that: The fixing mechanism (5) includes a fixed disk (51) and a rotating disk (58). A first limiting groove (510) is provided on the surface of the fixed disk (51), and a second limiting groove (580) is provided on the surface of the rotating disk (58). The first limiting groove (510) and the second limiting groove (580) are arranged alternately. A sliding rod (53) is slidably connected inside the first limiting groove (510). One end of the sliding rod (53) is fixedly connected to a limiting column (59), and the other end of the sliding rod (53) is fixedly connected to a clamping claw (52). The limiting column (59) is slidably connected to the inner side wall of the second limiting groove (580). The rotating disk (58) is rotatably connected to the side wall of the fixed disk (51).

7. The laser welding device for processing a pressure instrument according to claim 6, characterized in that: The bottom end of the fixed disk (51) is connected to a base, and an electric cylinder (54) is rotatably connected to the base. The output end of the electric cylinder (54) is fixedly connected to a screw rod (56). The outer wall of the screw rod (56) is threadedly connected to a threaded seat (57). The top end of the threaded seat (57) is rotatably connected to a connecting seat (55). The connecting seat (55) is fixedly connected to the rotating disk (58).

8. A laser welding method for processing a pressure instrument, characterized in that: A laser welding device for processing a pressure gauge according to any one of claims 1 to 7 is used, and is divided into two operating processes: shell sealing welding and pressure joint sealing welding, wherein the shell sealing welding position is on the upper and lower surfaces of the pressure gauge, and the pressure joint sealing welding position is on the side wall of the pressure gauge. By adjusting the facing position of the pressure gauge and the laser welding mechanism (6), laser welding processing at different positions is realized, and by adjusting the relative positions of the transmission shaft 1 (32) and the transmission shaft 2 (37), alignment with the pressure surface welding is achieved. By replacing the bending plates (4) of different sizes, adaptive adjustment of the surrounding radius of the laser welding mechanism (6) is achieved.

9. The laser welding method for processing a pressure instrument according to claim 8, characterized in that: The welding method is divided into the following steps: S1. Place the pressure instrument part in the fixing mechanism (5), and move the four clamping jaws (52) closer to each other to achieve clamping and fixing; S2. Loosen the fastening screws under the connecting rod, adjust the angle between gear 1 (33) and gear 2 (34) so that the transmission shaft 1 (32) is parallel to the corresponding plane of the weld, and then tighten the screws to position it; S3. Adjust the position of the mounting seat (2) on the gantry and adjust the position of the slider (311) on the positioning seat (31) so that the transmission shaft (32) is aligned with the center of the circular weld; S4, driving the servo motor (1), causing the servo motor (1) to drive the laser welding mechanism (6) to rotate around the weld seam, and simultaneously starting the laser welding mechanism (6), causing the laser welding mechanism (6) to perform laser welding operations on the weld seam.

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