Device and method for welding outer circular seam of diaphragm capsule of pressure accumulator

Abstract

The invention provides an accumulator diaphragm capsule outer circular seam welding device and method.The accumulator diaphragm capsule outer circular seam welding device comprises a pre-welding assembly mechanism and a welding clamping mechanism, the welding clamping mechanism comprises a mandrel and a gland, and a plurality of diaphragms are coaxially and fixedly clamped to the outer side of the mandrel and fixed through the gland; the pre-welding assembling mechanism comprises a support, an upper roller and a lower roller, wherein the upper roller and the lower roller are installed in the support in parallel. A roundness correction position is formed between the upper roller and the lower roller. When the diaphragm is rounded, the welding clamping mechanism is arranged in the rounded position, the axis of the mandrel is parallel to the axis of the upper roller and the axis of the lower roller, the outer end face of the diaphragm is in lap joint with the upper roller and the lower roller, and the upper roller and the lower roller rotate to drive the mandrel to rotate. The pre-welding assembling mechanism and the welding clamping mechanism are adopted, the welding clamping mechanism is sleeved with a diaphragm, and the pre-welding assembling mechanism is used for roundness correction, so that a welding piece has good centering degree, precise and efficient welding of an outer circle welding seam of a pressure accumulator diaphragm capsule part is achieved, and the welding efficiency is improved. And the problem of poor welding seam forming caused by low assembling precision of the outer circle of the diaphragm capsule is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm box welding, and in particular to a device and method for welding an outer circular seam of a diaphragm box of an accumulator. Background Art

[0002] The diaphragm accumulator is the preferred solution for vibration suppression of my country's launch vehicle POGO. As its key component, the diaphragm is welded by dozens of diaphragms, a cover and a base. The welding of the diaphragm is difficult to observe, requires high assembly precision and high weld quality. The diaphragm is a thin-walled structure and belongs to the welding of precision structural parts. The diaphragm assembly before welding has the problem of poor weld formation due to misalignment, which affects the reliability of product use. Therefore, in order to ensure good weld formation and welding quality, the pre-welding assembly quality requirements are high and the assembly difficulty is large. In addition, during the diaphragm welding process, multiple diaphragm pairs (two diaphragm inner circles are welded to form a diaphragm pair) need to be welded into a diaphragm group. Therefore, in order to ensure the formation of the weld, the diaphragms need to be supported and quickly dissipated.

[0003] At present, the welding field of membrane box thin-walled precision structural parts does not pay enough attention to the welding assembly accuracy, lacks effective means to ensure assembly accuracy, and has problems such as low local assembly accuracy leading to poor weld formation, affecting product reliability. Therefore, it is necessary to form a set of effective means to ensure the welding assembly accuracy of thin-walled precision structures to achieve high-quality and efficient welding.

[0004] The patent document with the publication number CN214024156U discloses a diaphragm box annular seam welding mechanism, including a support shell, a transmission motor is fixedly connected to the right side of the inner cavity of the support shell, a transmission plate is fixedly connected to the upper end of the transmission motor, a diaphragm box is placed on the upper end of the transmission plate, a positioning ring is fixedly connected to the outer side of the transmission plate at the upper end of the support shell, a ball is movably embedded in the upper outer part of the positioning ring, a bracket is fixedly connected to the outer side of the upper end of the support shell, a connecting plate is fixedly connected to the upper end of the bracket, a first electric telescopic rod is fixedly connected to the right side of the upper end of the connecting plate, a pressure plate is connected to the lower end of the transmission rod of the first electric telescopic rod through a bearing, and a second electric telescopic rod is fixedly connected to the lower inner left side of the bracket pair. This diaphragm box annular seam welding mechanism can make the welding of the diaphragm box more convenient and faster through the overall structure of the equipment. However, it still cannot solve the problem of poor welding quality caused by misalignment between multiple diaphragms. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a device and method for welding the outer circular seam of a diaphragm box of an accumulator.

[0006] The accumulator diaphragm outer annular seam welding device provided by the present invention comprises a pre-welding assembly mechanism and a welding clamping mechanism, wherein the welding clamping mechanism comprises a core shaft and a gland, and a plurality of diaphragms are coaxially and fixedly clamped on the outer side of the core shaft and fixed by the gland; The pre-welding assembly mechanism comprises a bracket and an upper roller and a lower roller installed in parallel in the bracket, and a circle calibration position is formed between the upper roller and the lower roller; When the diaphragm is calibrated, the welding clamping mechanism is set in the calibration position, and the axis of the core shaft is parallel to the axes of the upper roller and the lower roller. The outer end surface of the diaphragm overlaps the upper roller and the lower roller. The upper roller and the lower roller are used to drive the core shaft to rotate by rotating.

[0007] Preferably, a pneumatic device is installed on the top of the bracket, and a piston rod provided at the bottom of the pneumatic device is connected to the upper roller to drive the upper roller to move in the vertical direction.

[0008] Preferably, two lower rollers are installed in parallel in the bracket, and in axial projection, the two lower rollers and the upper roller are arranged in a triangle; A lower roller adjusting sliding rod is installed at the bottom of the two lower rollers to adjust the distance between the two lower rollers.

[0009] Preferably, the lower roller adjustment sliding rod comprises a sliding mechanism, a screw rod, a nut and a rocker; The sliding mechanism is installed at the bottom of the two lower rollers, and the lower rollers are slidably set on the bracket through the sliding mechanism. The screw rod is fixedly installed on the bracket. The lower rollers are installed on the screw rod through a nut located at the bottom. The rocker is installed at the end of the screw rod. The screw rod drives the lower rollers to slide on the bracket under the drive of the rocker rod.

[0010] Preferably, the welding clamping mechanism further comprises a gland and bolts, the middle portion of the mandrel is radially concave to form an outwardly convex mandrel tail and a concave diaphragm assembly area, and the diaphragm is sleeved on the diaphragm assembly area; The gland is installed at one end of the diaphragm assembly area, one side of the gland is a clamping side for clamping the diaphragm, the bolt passes through the gland and is threadedly connected to the core shaft for adjusting the distance between the gland and the core shaft, thereby clamping the diaphragm.

[0011] Preferably, one or more gaskets are installed on the clamping side of the gland, and the side of the gasket is used to cooperate with one side of the diaphragm assembly area to clamp the diaphragm; The outer diameters of the core shaft tail, the gasket and the gland are consistent.

[0012] Preferably, a plurality of diaphragms arranged in pairs are clamped on the outer side of the core shaft, welding gaskets are arranged between adjacent diaphragm pairs, and the diaphragm pairs are clamped by adjacent welding gaskets; The welding gasket comprises two semicircular gaskets, which are symmetrically spliced ​​to form the welding gasket.

[0013] Preferably, the outer side surface of the welding gasket is provided with an outwardly convex overlapping portion and an inwardly concave diaphragm accommodating portion along the axial direction; In a pair of diaphragms, the diaphragms on both sides overlap the edges of the diaphragm accommodating parts of adjacent welding gaskets respectively, and the outer edges of the diaphragms protrude from the diaphragm accommodating parts, and the overlapping parts are used to overlap with the upper roller and the lower roller.

[0014] According to the method for welding the outer circular seam of the accumulator diaphragm box provided by the present invention, the outer circular seam welding device of the accumulator diaphragm box is adopted, and the method comprises the following steps: Step 1: Clamping step, insert the diaphragm and the welding gasket into the diaphragm assembly area of ​​the mandrel in sequence, place a welding gasket between every two diaphragms, place washers of preset thickness and quantity at one end of the diaphragm assembly area, cover with a gland, and pre-tighten the bolts; Step 2: roundness calibration step. According to the outer diameter of the diaphragm and the welding clamping mechanism, turn the lower roller adjustment slide rod to pre-adjust the lower roller spacing, place the welding clamping mechanism between the lower rollers, adjust the spacing of the lower rollers again, and use the pneumatic device to drive the upper roller to press down. After pressing down to the right position, drive the upper and lower rollers to rotate through the rocker, check the clamping accuracy of the diaphragm and adjust accordingly. After the adjustment is completed, tighten all bolts symmetrically; Step 3: Welding step: put the diaphragm and welding clamping mechanism after roundness calibration into the welding machine, pre-pass the back shielding gas, center the tungsten electrode, make the tungsten electrode point to the diaphragm joint surface, rotate the welding clamping mechanism, observe the circumferential centering degree of the tungsten electrode, and weld in sequence until the outer circular seam welding of all diaphragm pairs is completed; Step 4: Disassembly step. After welding is completed, remove the bolts, remove the gland and gasket, take out the diaphragm group with the outer circle welded, remove the welding gasket between the diaphragms, and inspect the weld quality.

[0015] Preferably, detecting the clamping accuracy of the diaphragm includes observing from the front during the rotation whether the end face of the diaphragm and the end face of the welding gasket are completely aligned and whether there is a gap at the interface of the semicircular gasket in the welding gasket.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts a pre-welding assembly mechanism and a welding clamping mechanism. By sleeve-mounting the diaphragm on the welding clamping mechanism and arranging the welding clamping mechanism on the pre-welding assembly mechanism for roundness correction, the welding piece has a better degree of centering, and the precise and efficient welding of the outer circle weld of the accumulator diaphragm box part is achieved, thus avoiding the problem of poor weld formation caused by low outer circle assembly accuracy of the diaphragm box.

[0017] 2. The present invention provides welding gaskets between the welding plate groups as a support and rapid heat dissipation structure between the diaphragms, thereby ensuring the stable formation of the weld. In addition, by designing the welding gaskets as a self-locking structure, the assembly accuracy of the welding gaskets is effectively improved and the deformation loss of the gaskets is reduced.

[0018] 3. The welding device provided by the present invention can assemble and weld multiple groups of diaphragms at one time, and can adapt to the welding of bellows with different numbers of diaphragms, effectively improving the welding efficiency of bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 It is a structural schematic diagram of the pre-welding assembly mechanism in the present invention; Figure 2 It is a structural schematic diagram of the welding clamping mechanism in the present invention; Figure 3 It is a schematic diagram of the assembly of the diaphragm and the welding gasket in the present invention; Figure 4 It is a structural schematic diagram of the welding gasket in the present invention; Figure 5 It is an assembly schematic diagram of the welding clamping mechanism and the pre-welding assembly mechanism in the present invention.

[0020] The figure shows: DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0022] The present invention provides a device and method for welding the outer circular seam of a diaphragm box of an accumulator. The diaphragm can be calibrated as a whole before welding, and after the diaphragm is neatly assembled, it is loaded into a welding machine to weld the outer circular welds one by one. Precise and efficient welding of the outer circular welds of the accumulator diaphragm box parts can be achieved, and poor weld quality caused by low assembly accuracy of the outer circle of the diaphragm box can be avoided. The welding of multiple outer circular welds can be achieved by assembling them at one time, which can effectively improve the welding efficiency and improve the reliability of welding quality.

[0023] The accumulator diaphragm outer annular seam welding device provided by the present invention comprises a pre-welding assembly mechanism and a welding clamping mechanism, wherein the welding clamping mechanism is used to clamp the diaphragm, and the pre-welding assembly mechanism is used to calibrate the diaphragm before welding; like Figure 2 As shown, the welding clamping mechanism includes a core shaft 22 and a pressure cover 24, and a plurality of diaphragms are coaxial and fixedly clamped on the outer side of the core shaft 22, and fixed by the pressure cover 24; the middle part of the core shaft 22 is radially concave to form an outwardly convex core shaft tail and a concave diaphragm assembly area, and the diaphragm is sleeved on the diaphragm assembly area; the pressure cover 24 is installed at one end of the diaphragm assembly area, and one side of the pressure cover 24 is a clamping side for clamping the diaphragm, and the bolt 23 passes through the pressure cover 24 and is threadedly connected to the core shaft 22, so as to adjust the distance between the pressure cover 24 and the core shaft 22, thereby clamping the diaphragm.

[0024] In a preferred example, one or more washers 21 are installed on the clamping side of the gland 24, and the side of the washers 21 is used to cooperate with one side of the diaphragm assembly area to clamp the diaphragm; the outer diameters of the mandrel tail, the washers 21 and the gland 24 are consistent. In the actual clamping process, washers 21 of different numbers and sizes can be installed according to the number of diaphragms, so as to achieve stable clamping.

[0025] like Figure 3 As shown, a plurality of diaphragms arranged in pairs are clamped on the outside of the core shaft 22, and there are welding annular seams between the outer edges of the diaphragm group. In order to achieve reliable support and heat dissipation of the diaphragm group, welding gaskets 25 are arranged between adjacent diaphragm pairs, and the diaphragm pairs are clamped by adjacent welding gaskets 25; the outer side surface of the welding gasket 25 is axially provided with a convex overlapping portion and a concave diaphragm accommodating portion; in a pair of diaphragms, the diaphragms on both sides overlap with the edges of the diaphragm accommodating portions of adjacent welding gaskets 25 respectively, and the outer edge of the diaphragm protrudes from the diaphragm accommodating portion, and the overlapping portion is used to overlap with the upper roller 12 and the lower roller 14. When calibrating the circle, the outer edge of the diaphragm is calibrated to be flush with the overlapping portion of the welding gasket 25, so as to ensure the welding quality. In a preferred example, as Figure 4 As shown, the welding gasket 25 includes two semicircular gaskets, which are symmetrically spliced ​​together through self-locking structures at the ends to form the welding gasket 25.

[0026] like Figure 1As shown, the pre-welding assembly mechanism includes a bracket 13 and an upper roller 12 and a lower roller 14 installed in parallel in the bracket, and a rounding position is formed between the upper roller 12 and the lower roller 14; a pneumatic device 11 is installed on the top of the bracket 13, and a piston rod at the bottom of the pneumatic device 11 is connected to the upper roller 12, and is used to drive the upper roller 12 to move in the vertical direction. Two lower rollers 14 are installed in parallel in the bracket 13, and in the axial projection, the two lower rollers 14 and the upper roller 12 are arranged in a triangle; a lower roller adjustment slide rod 16 is installed at the bottom of the two lower rollers 14, and is used to adjust the distance between the two lower rollers 14. The pneumatic device 11 and the lower roller adjustment slide rod 16 are used to adjust the distance between the upper roller 12 and the lower roller 14, and the distance between the two lower rollers 14, respectively, so as to be suitable for diaphragms of different sizes; When the diaphragm is rounded, Figure 5 As shown, the welding clamping mechanism is arranged in the circle calibration position, and the axis of the core shaft 22 is parallel to the axes of the upper roller 12 and the lower roller 14, the outer end surface of the diaphragm overlaps the upper roller 12 and the lower roller 14, and the upper roller 12 and the lower roller 14 are used to drive the core shaft 22 to rotate by rotating.

[0027] In a preferred example, the lower roller adjustment slide rod 16 includes a sliding mechanism, a screw rod, a nut and a rocker; the sliding mechanism is installed at the bottom of the two lower rollers 14, and the lower rollers 14 are slidably set on the bracket 13 through the sliding mechanism, the screw rod is fixedly installed on the bracket 13, and the lower roller 14 is installed on the screw rod through a nut located at the bottom, and the rocker is installed at the end of the screw rod. The screw rod drives the lower roller 14 to slide on the bracket 13 under the drive of the rocker.

[0028] Example 1 The present embodiment provides a device for welding the outer circular seam of a pressure accumulator diaphragm box, which includes a pre-welding assembly mechanism and a welding clamping mechanism. The pre-welding assembly mechanism includes a pneumatic device 11, a bracket 13, an upper roller 12, a lower roller 14, a lower roller adjustment slide rod 16, and a rocker 15. The pneumatic device 11 can realize the downward pressure of the pneumatic upper roller 12; the lower roller 14 is provided with two, and the spacing can be adjusted. The three round rollers are distributed in a triangle and connected by the bracket 13. The spacing and height of the round rollers are adjusted according to the diaphragm to be welded and the welding system through the pneumatic device 11 and the lower roller adjustment slide rod 16; the pneumatic device 11 can realize the downward pressure adjustment, control the downward pressure speed, and ensure that the upper roller 12 does not damage the outer surface of the welding device during the downward pressure process. The lower roller adjustment slide rod 16 can control the spacing between the two lower rollers 14 through a hand wheel, which is used to match diaphragms of different sizes to be welded.

[0029] During operation, the rocker 15 directly controls the rotation of a lower roller 14, thereby causing the welding device and the other two round rollers to follow the movement. The surface of the round roller contacts the end face of the diaphragm and the end face of the diaphragm welding gasket 25, and the rolling ensures that the entire circle of the diaphragm is assembled neatly without misalignment.

[0030] The welding clamping mechanism includes a core shaft 22, a pressure cover 24, a gasket 21, bolts 23, and a welding gasket 25. The outer diameters of the core shaft 22, the gasket 21, and the pressure cover 24 are completely consistent and are determined by the outer diameter of the welded diaphragm. The core shaft 22 and the pressure cover 24 are tightly connected by 6 bolts 23 distributed circumferentially. The size of the welding gasket 25 is designed according to the geometric size of the diaphragm. The gasket 21 is equipped with multiple pieces and multiple heights to match the number of different diaphragms to be welded. During operation, install the diaphragm and welding gasket 25 into the mandrel 22 in sequence, place the washers 21 of matching quantity and height, pre-tighten the pressure cover 24, place the entire welding system between the two lower rollers 14 of the pre-welding assembly system, adjust the spacing and height of the three round rollers, shake the rocker 15, roll the round rollers, drive the welding system, and after all the diaphragms and welding gaskets 25 to be welded are neatly assembled, tighten the bolts 23 symmetrically, place the welding system on the welding machine and start the outer circular ring seam welding, and after all welding is completed, disassemble the welding device.

[0031] The outer diameter D1 of the diaphragm assembly area of ​​the mandrel 22 = the inner diameter of the diaphragm - 2mm; the outer diameter of the tail and D2 = the outer diameter of the diaphragm - 0.4mm, to ensure that the end of the diaphragm contacts the surface of the round roller; the end is provided with an assembly area matching the gland 24, and the gland 24 is correspondingly provided with an assembly area, and the assembly area has a 10mm assembly margin to ensure the assembly effect of different numbers of diaphragms; a through hole with a diameter of 8mm is opened in the center of the tail, and 56 through holes with a diameter of 3mm are opened in 8 rows in the circumferential direction in the diaphragm assembly area, which are used to pass the shielding gas during welding. Furthermore, multiple washers 21 of different heights are provided at the end of the mandrel 22 to adapt to the one-time welding of different numbers of diaphragms to be welded. The outer diameter D3 of the welding gasket 25 = the outer diameter of the diaphragm, and the profile structure on both sides of the welding gasket 25 is determined according to the profile structure of the diaphragm; the welding gasket 25 between the diaphragms is composed of two semicircular gaskets, which are used in pairs, and the splicing line is "Ω"-shaped, so that the gasket is self-locking during the assembly process, which improves the assembly accuracy of the welding gasket and reduces the deformation loss of the gasket.

[0032] Example 2 This embodiment provides a method for welding an outer circular seam of a pressure accumulator diaphragm box, using the aforementioned device for welding an outer circular seam of a pressure accumulator diaphragm box, comprising the following steps: Clamping stage: insert the diaphragms and welding gaskets 25 pairs into the mandrel 22 in sequence, and place a pair of welding gaskets 25 between every two diaphragms. Figure 2 The figure shows the assembly state between the diaphragm and the welding gasket 25, which ensures that the paired welding gaskets 25 are self-locking. According to the number of diaphragms, the height and number of washers 21 are selected, the pressure cover 24 is covered, and the bolts 23 are pre-tightened to ensure that the diaphragm and the welding gasket 25 are pressed tightly.

[0033] Rounding stage: according to the outer diameter of the diaphragm and the welding device, turn the lower roller adjustment slide rod 16, pre-adjust the spacing of the lower rollers 14, place the assembled welding device between the two lower rollers 14, adjust the distance between the lower rollers 14 again, set the downward pressure of the pneumatic device 11, slowly lower the upper roller 12, turn the rocker 15, and ensure that the welding device rotates with the three round rollers. During the rotation, observe from the front whether the end face of the diaphragm and the end face of the welding gasket 25 are completely aligned, and whether there is a gap at the interface of the welding gasket 25. After the rounding is completed, tighten all the bolts 23 symmetrically between the three round rollers.

[0034] Welding stage: put the assembled diaphragm together with the welding device into the welding machine jaws, pre-pass the back shielding gas for 30 seconds, center the tungsten electrode so that it points to the diaphragm joint surface, rotate the welding device, observe the circumferential centering of the tungsten electrode, set the welding parameters, and weld the first circumferential seam. Observe the arc during welding, and make slight adjustments according to actual conditions. Perform interval welding until all outer circular seams are welded.

[0035] Disassembly stage: After welding is completed, loosen the bolts 23, remove the gland 24 and the gasket 21, take out the diaphragm group with the outer circle welded, remove the welding gasket 25 between the diaphragms, and inspect the quality of the weld.

[0036] The accumulator diaphragm box outer circular seam welding device and welding method of the present invention can effectively ensure the outer circular end face assembly accuracy and improve the welding quality stability while realizing one-time welding of multiple diaphragm outer circular welds.

[0037] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A device for welding the outer circular seam of a pressure accumulator diaphragm, characterized in that: It comprises a pre-welding assembly mechanism and a welding clamping mechanism, wherein the welding clamping mechanism comprises a core shaft (22) and a pressure cover (24), and a plurality of diaphragms are coaxially and fixedly clamped on the outside of the core shaft (22) and fixed by the pressure cover (24); The pre-welding assembly mechanism comprises a bracket (13) and an upper roller (12) and a lower roller (14) mounted in parallel in the bracket, wherein a circle calibration position is formed between the upper roller (12) and the lower roller (14); When the diaphragm is calibrated, the welding clamping mechanism is arranged in the calibration position, and the axis of the core shaft (22) is parallel to the axes of the upper roller (12) and the lower roller (14), the outer end surface of the diaphragm overlaps the upper roller (12) and the lower roller (14), and the upper roller (12) and the lower roller (14) are used to drive the core shaft (22) to rotate by rotating.

2. The accumulator diaphragm outer circular seam welding device according to claim 1 is characterized in that: A pneumatic device (11) is installed on the top of the bracket (13); a piston rod at the bottom of the pneumatic device (11) is connected to the upper roller (12) and is used to drive the upper roller (12) to move in the vertical direction.

3. The accumulator diaphragm outer circular seam welding device according to claim 1 is characterized in that: Two lower rollers (14) are installed in parallel in the bracket (13); in axial projection, the two lower rollers (14) and the upper roller (12) are arranged in a triangle; A lower roller adjustment slide rod (16) is installed at the bottom of the two lower rollers (14) for adjusting the distance between the two lower rollers (14).

4. The accumulator diaphragm outer annular seam welding device according to claim 3 is characterized in that: The lower roller adjustment slide rod (16) comprises a sliding mechanism, a screw rod, a nut and a rocker; The sliding mechanism is mounted at the bottom of the two lower rollers (14); the lower rollers (14) are slidably mounted on the bracket (13) through the sliding mechanism; the screw rod is fixedly mounted on the bracket (13); the lower rollers (14) are mounted on the screw rod via a nut at the bottom; the rocker is mounted at the end of the screw rod; and the screw rod drives the lower rollers (14) to slide on the bracket (13) under the drive of the rocker rod.

5. The accumulator diaphragm outer circular seam welding device according to claim 1, characterized in that: The welding clamping mechanism further comprises a gland (24) and a bolt (23); the middle portion of the mandrel (22) is radially concave to form an outwardly convex mandrel tail portion and a concave diaphragm assembly area; the diaphragm is sleeved on the diaphragm assembly area; The gland (24) is installed at one end of the diaphragm assembly area, one side of the gland (24) is a clamping side for clamping the diaphragm, and the bolt (23) passes through the gland (24) and is threadedly connected to the core shaft (22) for adjusting the distance between the gland (24) and the core shaft (22), thereby clamping the diaphragm.

6. The accumulator diaphragm outer annular seam welding device according to claim 5, characterized in that: One or more gaskets (21) are installed on the clamping side of the gland (24), and the side of the gasket (21) is used to cooperate with one side of the diaphragm assembly area to clamp the diaphragm; The outer diameters of the core shaft tail, the washer (21) and the gland (24) are consistent.

7. The accumulator diaphragm outer circular seam welding device according to claim 1 is characterized in that: A plurality of diaphragms arranged in pairs are clamped on the outside of the core shaft (22), welding gaskets (25) are arranged between adjacent diaphragm pairs, and the diaphragm pairs are clamped by adjacent welding gaskets (25); The welding gasket (25) comprises two semicircular gaskets, and the two semicircular gaskets are symmetrically spliced ​​together through self-locking structures at the ends to form the welding gasket (25).

8. The accumulator diaphragm outer annular seam welding device according to claim 7, characterized in that: The outer side surface of the welding gasket (25) is provided with an outwardly convex overlapping portion and an inwardly concave diaphragm accommodating portion along the axial direction; In a pair of diaphragms, the diaphragms on both sides overlap the edges of the diaphragm accommodating parts of adjacent welding gaskets (25), and the outer edges of the diaphragms protrude from the diaphragm accommodating parts. The overlapping parts are used to overlap with the upper roller (12) and the lower roller (14).

9. A method for welding the outer circular seam of a pressure accumulator diaphragm, characterized in that: The accumulator diaphragm outer circular seam welding device according to any one of claims 1 to 8 comprises the following steps: Step 1: Clamping step, insert the diaphragm and the welding gasket (25) into the diaphragm assembly area of ​​the core shaft (22) in sequence, place a welding gasket (25) between every two diaphragms, place a gasket (21) of preset thickness and quantity at one end of the diaphragm assembly area, cover with a gland (24), and pre-tighten the bolt (23); Step 2: roundness calibration step. According to the outer diameter of the diaphragm and the welding clamping mechanism, turn the lower roller adjustment slide rod (16) to pre-adjust the spacing of the lower rollers (14). Place the welding clamping mechanism between the lower rollers (14). Adjust the spacing of the lower rollers (14) again. Drive the upper roller (12) downward through the pneumatic device (11). After the upper roller (12) and the lower roller (14) are pressed into place, drive the upper roller (12) and the lower roller (14) to rotate through the rocker (15). Check the clamping accuracy of the diaphragm and make corresponding adjustments. After the adjustment is completed, tighten all the bolts (23) symmetrically. Step 3: Welding step: put the diaphragm and welding clamping mechanism after roundness calibration into the welding machine, pre-pass the back shielding gas, center the tungsten electrode, make the tungsten electrode point to the diaphragm joint surface, rotate the welding clamping mechanism, observe the circumferential centering degree of the tungsten electrode, and weld in sequence until the outer circular seam welding of all diaphragm pairs is completed; Step 4: Disassembly step. After welding is completed, remove the bolts (23), remove the gland (24) and the gasket (21), take out the diaphragm group with the outer circle welded, remove the welding gasket (25) between the diaphragms, and inspect the quality of the weld.

10. The method for welding the outer circular seam of the accumulator diaphragm box according to claim 9, characterized in that: Testing the clamping accuracy of the diaphragm includes observing from the front during the rotation whether the end face of the diaphragm and the end face of the welding gasket (25) are completely aligned and whether there is a gap at the interface of the semicircular gasket in the welding gasket (25).

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