A welding device suitable for an ethylene oxide small tank gas cylinder

Abstract

The present application relates to welding equipment technical field, concretely relates to a kind of welding device suitable for ethylene oxide small tank gas cylinder, at least including rack, laser welding arm, rotary positioner, still including clamp assembly being set on rotary positioner, the clamp assembly includes clamp shell, pressing sleeve, radial lock body, holding device, central compression spring, outer ring compression spring assembly.The clamp shell includes shell base, built-in chamber, external chamber.The pressing sleeve is slidably arranged in built-in chamber.The radial lock body includes lock body slider, inner side slope, outer side slope.The holding device includes rotating assembly, lifting assembly.The welding device described in the case only needs a set of clamp assembly to fix ethylene oxide small tank gas cylinder.The welding device described in the case is simple to operate, and only needs "one press" "one turn" to respectively realize the fixation and unlocking of gas cylinder.

Description

Technical Field

[0001] This application relates to the field of welding equipment technology, specifically to a welding device suitable for ethylene oxide small tank gas cylinders. Background Technology

[0002] Ethylene oxide is widely used in sterilization, disinfection, and chemical synthesis. However, ethylene oxide is flammable, explosive, and highly toxic, requiring extremely high safety and stability from its storage containers. In the medical disinfection field, sterilization equipment with a sterilization chamber is typically used, connected to a suitable number of disposable gas cylinders as the gas source. Traditional ethylene oxide gas cylinders are mostly made of aluminum, which has limited pressure resistance and relies on mechanical compression for sealing, resulting in insufficient strength. Therefore, they are gradually being replaced by double-walled stainless steel gas cylinders.

[0003] Welding double-walled stainless steel bottle necks requires rotary laser welding technology. Existing techniques for welding double-walled stainless steel gas cylinder necks necessitate two sets of clamps. The lower clamp, such as a three-jaw chuck, holds the outer wall of the outer bottle for fixation, while the upper clamp, driven by a telescopic rod, uses an inverted conical clamp to hold the inner bottle neck in place. This process is complex and cumbersome. Therefore, a portable welding device is needed to hold the gas cylinder for rotary welding. Summary of the Invention

[0004] A welding device suitable for ethylene oxide small tank gas cylinders includes at least a frame, a laser welding arm, and a rotary positioner, and also includes a clamp assembly mounted on the rotary positioner. The clamp assembly includes a clamp housing, a pressing sleeve, a radial locking body, a retaining device, a central compression spring, and an outer compression spring assembly.

[0005] The fixture housing includes a housing base, an internal chamber, and an external chamber. The housing base includes a connecting flange connected to the turntable of the rotary positioner, and also includes a lower narrow shaft and a columnar base. The internal chamber includes a guide opening on the upper surface of the columnar base, a longitudinal circular cavity below the guide opening, radial through holes evenly distributed around the outer edge of the longitudinal circular cavity, and a non-rotating key on the inner wall of the longitudinal circular cavity. The external chamber includes an annular groove on the upper half of the outer wall of the columnar base, an annular lower cavity below the inner side of the annular groove, a limiting protrusion on the upper end of the annular groove, and limiting shaft grooves evenly distributed around the inner walls of the annular groove and the annular lower cavity. Four radial through holes are provided.

[0006] The pressing sleeve is slidably disposed in the built-in cavity. The pressing sleeve includes a sleeve body with an upper opening, a deep-cut annular groove on the upper half of the outer wall of the sleeve body, an inner ring cone that is narrower at the top and wider at the bottom at the lower end of the deep-cut annular groove, and an anti-rotation longitudinal hole on the outer wall of the sleeve body that is inserted and engaged with an anti-rotation key.

[0007] The radial lock body includes a slidable lock body slider disposed within the radial through hole, an inner inclined surface disposed inside the lock body slider, and an outer inclined surface disposed outside the lock body slider.

[0008] The holding device includes a rotating assembly and a lifting assembly. The rotating assembly includes a rotatable torsion ring disposed in an annular groove, an upper groove on the inner edge of the upper end of the torsion ring that cooperates with a limiting protrusion ring, and an active plug disposed on the inner wall of the torsion ring. The lifting assembly includes a slidable lifting ring body disposed in the lower annular cavity, a driven inclined groove disposed on the outer wall of the lifting ring that is inserted into the active plug, a lifting ring groove disposed above the inner wall of the lifting ring, an outer ring cone that is wider at the top and narrower at the bottom disposed on the lower edge of the lifting ring groove, and a limiting plug disposed on the inner wall of the lifting ring groove that is inserted into the limiting shaft groove.

[0009] The central compression spring is located inside the vertically oriented circular cavity, below the pressing sleeve.

[0010] The outer compression spring assembly includes an outer spring disposed within the annular lower cavity below the lifting assembly.

[0011] As a further implementation plan:

[0012] The external chamber also includes an adjustment ring groove located on the lower half of the outer wall of the columnar foundation, and adjustment side holes evenly distributed along the inner edge of the adjustment ring groove and communicating with the annular lower cavity.

[0013] The outer ring compression spring assembly also includes a rotatable internal threaded ring disposed in the adjusting ring groove, a compression spring bottom ring disposed in the annular lower cavity below the outer ring spring, and radial insert rods evenly distributed around the outer circumference of the compression spring bottom ring and inserted into the adjusting side hole. The distal end of the radial insert rod is formed with an external thread that is screwed to the internal threaded ring.

[0014] As a further implementation: the pressing sleeve also includes locking side holes that are circumferentially distributed along the outer edge of the sleeve body and correspond one-to-one with the radial through holes;

[0015] The radial lock body also includes a through slide rail that runs longitudinally through the middle of the outer side of the lock body slider, a radial channel that runs radially within the lock body slider, a lower spring cavity located below the radial channel, a lock body compression spring located within the lower spring cavity, a telescopic lock rod that is slidably inserted into the radial channel, and a spring stop block located at the lower end of the telescopic lock rod and blocking the outer side of the lock body compression spring. The lower side of the telescopic lock rod is provided with a lock rod slope, and the inner side of the telescopic lock rod is inserted into the locking side hole.

[0016] The lifting assembly also includes a pressing inclined block disposed on the inner wall of the lifting ring and a retaining protrusion disposed below the pressing inclined block. The pressing inclined block can slide through the through slide and contact and cooperate with the inclined surface of the locking rod.

[0017] The beneficial effects of this invention are:

[0018] The welding device described in this case only requires one set of clamp assembly to fix the ethylene oxide small tank gas cylinder. It has an ingenious structure and is easy to operate. The rotary positioner drives the clamp assembly and the ethylene oxide small tank gas cylinder to rotate, and in conjunction with the laser welding arm, the annular welding at the upper opening of the outer tank and the inner tank can be completed.

[0019] The welding device described in this case is simple to operate; it only requires "pressing" and "turning" to fix and unlock the gas cylinder, respectively.

[0020] Insert the ethylene oxide gas cylinder into the pressing sleeve and move it downwards against the damping of the central compression spring. The lifting assembly can then move upwards and press the radial lock body inwards to clamp and fix the pressing sleeve and the ethylene oxide gas cylinder in sequence.

[0021] Rotating the rotating assembly causes the lifting assembly to move downward against the damping of the outer ring spring. The pressing sleeve is driven upward by the central compression spring. The pressing sleeve drives the radial lock body to move outward and locks the posture of the lifting device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of one embodiment of the welding apparatus.

[0024] Figure 2 This is a schematic diagram of one embodiment of the rotary positioner, fixture assembly, and ethylene oxide gas cylinder (the cap is not shown).

[0025] Figure 3 This is a schematic diagram of the clamp assembly and the ethylene oxide gas storage cylinder (the cap is not shown).

[0026] Figure 4 This is an isometric sectional view of the fixture assembly in state one.

[0027] Figure 5 This is a cross-sectional view of the fixture assembly in its state.

[0028] Figure 6 This is a two-section view of the fixture assembly in its state.

[0029] Figure 7This is a three-section view of the fixture assembly in its state.

[0030] Figure 8 This is an isometric sectional view of the ethylene oxide small tank storage cylinder.

[0031] Figure 9 This is a schematic diagram of one embodiment of the fixture housing.

[0032] Figure 10 This is an isometric sectional view of one embodiment of the fixture housing.

[0033] Figure 11 This is a schematic diagram of one embodiment of the pressing sleeve.

[0034] Figure 12 This is an isometric sectional view of one embodiment of the pressing sleeve.

[0035] Figure 13 This is an isometric sectional view of one embodiment of the clamp housing and pressing sleeve.

[0036] Figure 14 This is a schematic diagram of one embodiment of the radial lock body.

[0037] Figure 15 This is an isometric sectional view of one embodiment of the radial lock body.

[0038] Figure 16 This is a schematic diagram of one embodiment of the holding device.

[0039] Figure 17 This is an isometric sectional view of one embodiment of the holding device.

[0040] Figure 18 This is an isometric sectional view of one embodiment of the clamp housing, central compression spring, and outer compression spring assembly.

[0041] The numbers in the diagram are as follows:

[0042] 91. Frame; 92. Laser welding arm; 93. Rotary positioner; 94. Fixture assembly;

[0043] 1. Fixture housing;

[0044] 11. Shell foundation; 111. Connecting flange; 112. Lower narrow shaft; 113. Columnar foundation;

[0045] 12. Internal chamber; 121. Guide opening; 122. Longitudinal circular cavity; 123. Radial through hole; 124. Anti-rotation key;

[0046] 13. External chamber; 131. Circumferential groove; 132. Circumferential lower cavity; 133. Limiting protrusion ring; 134. Limiting shaft groove; 135. Adjusting ring groove; 136. Adjusting side hole;

[0047] 2. Pressing sleeve, 21. Sleeve body, 22. Deeply cut annular groove, 23. Inner ring cone, 24. Anti-rotation longitudinal hole, 25. Locking side hole;

[0048] 3. Radial lock body, 301. Lock body slider, 302. Inner inclined surface, 303. Outer inclined surface, 304. Through slide, 305. Radial channel, 306. Lower spring cavity, 307. Lock body compression spring, 308. Telescopic lock rod, 309. Spring stop, 310. Lock rod inclined surface;

[0049] 4. Holding device;

[0050] 41. Rotating assembly; 411. Torsion ring; 412. Groove on ring; 413. Active plug;

[0051] 42. Lifting assembly; 421. Lifting ring body; 422. Driven inclined groove; 423. Lifting ring groove; 424. Outer ring cone; 425. Limit plug; 426. Extrusion inclined block; 427. Holding protrusion.

[0052] 5. Central compression spring;

[0053] 6. Outer ring compression spring assembly; 61. Outer ring spring; 62. Internal threaded ring; 63. Compression spring bottom ring; 64. Radial insert rod;

[0054] 7. Ethylene oxide small tank storage cylinder, 71. Outer tank, 711. Support frame, 72. Inner tank, 73. Bottle cap. Detailed Implementation

[0055] A welding device suitable for ethylene oxide small tank gas cylinders includes at least a frame 91, a laser welding arm 92, and a rotary positioner 93, and also includes a clamp assembly 94 disposed on the rotary positioner 93. The clamp assembly 94 includes a clamp housing 1, a pressing sleeve 2, a radial locking body 3, a holding device 4, a central compression spring 5, and an outer ring compression spring assembly 6.

[0056] The fixture housing 1 includes a housing base 11, an internal chamber 12, and an external chamber 13. The housing base 11 includes a connecting flange 111 connected to the turntable of the rotary positioner 93, and also includes a lower narrow shaft 112 and a columnar base 113. The internal chamber 12 includes a guide opening 121 on the upper surface of the columnar base 113, a longitudinally oriented circular cavity 122 below the guide opening 121, and radial passages evenly distributed around the outer edge of the longitudinally oriented circular cavity 122. The external cavity 13 includes a hole 123 and a non-rotating key 124 disposed on the inner wall of the longitudinally placed circular cavity 122; the external cavity 13 includes an annular groove 131 disposed on the upper half of the outer wall of the columnar base 113, an annular lower cavity 132 disposed below the inner side of the annular groove 131, a limiting protrusion 133 disposed at the upper end of the annular groove 131, and limiting shaft grooves 134 evenly distributed circumferentially on the inner walls of the annular groove 131 and the annular lower cavity 132; four radial through holes 123 are provided.

[0057] The pressing sleeve 2 is slidably disposed in the built-in cavity 12. The pressing sleeve 2 includes a sleeve body 21 with an upper opening, a deep annular groove 22 on the upper half of the outer wall of the sleeve body 21, an inner ring cone 23 with a narrow upper end and a wide lower end on the lower end of the deep annular groove 22, and a anti-rotation longitudinal hole 24 on the outer wall of the sleeve body 21 that is inserted and cooperates with the anti-rotation key 124.

[0058] The radial lock body 3 includes a lock body slider 301 that is slidably disposed in the radial through hole 123, an inner inclined surface 302 disposed inside the lock body slider 301, and an outer inclined surface 303 disposed outside the lock body slider 301.

[0059] The holding device 4 includes a rotating assembly 41 and a lifting assembly 42. The rotating assembly 41 includes a rotatable torsion ring 411 disposed in the annular groove 131, an annular upper groove 412 disposed on the inner edge of the upper end of the torsion ring 411 and cooperating with the limiting protrusion ring 133, and an active plug 413 disposed on the inner wall of the torsion ring 411. The lifting assembly 42 includes a slidable lifting ring body 421 disposed in the annular lower cavity 132, a driven inclined groove 422 disposed on the outer wall of the lifting ring body 421 and interlocking with the active plug 413, a lifting ring groove 423 disposed above the inner wall of the lifting ring body 421, an outer ring cone 424 that is wider at the top and narrower at the bottom disposed on the lower edge of the lifting ring groove 423, and a limiting plug 425 disposed on the inner wall of the lifting ring groove 423 and interlocking with the limiting shaft groove 134.

[0060] The central compression spring 5 is located inside the longitudinally placed circular cavity 122, below the pressing sleeve 2.

[0061] The outer ring compression spring assembly 6 includes an outer ring spring 61 disposed in the annular lower cavity 132 below the lifting assembly 42.

[0062] As a further implementation plan:

[0063] The external chamber 13 also includes an adjustment ring groove 135 located on the lower half of the outer wall of the columnar base 113, and adjustment side holes 136 evenly distributed along the inner edge of the adjustment ring groove 135 and communicating with the annular lower cavity 132.

[0064] The outer ring compression spring assembly 6 also includes a rotatable internal threaded ring 62 disposed in the adjusting ring groove 135, a compression spring bottom ring 63 disposed in the annular lower cavity 132 below the outer ring spring 61, and radial insert rods 64 circumferentially distributed on the outer periphery of the compression spring bottom ring 63 and inserted into the adjusting side hole 136. The distal end of the radial insert rod 64 is formed with an external thread that is screwed to the internal threaded ring 62.

[0065] As a further implementation plan:

[0066] The pressing sleeve 2 also includes locking side holes 25 that are circumferentially distributed along the outer edge of the sleeve body 21 and correspond one-to-one with the radial through holes 123.

[0067] The radial lock body 3 also includes a through slide 304 that runs longitudinally through the middle of the outer side of the lock body slider 301, a radial channel 305 that runs radially within the lock body slider 301, a lower spring cavity 306 located below the radial channel 305, a lock body compression spring 307 located within the lower spring cavity 306, a telescopic lock rod 308 that is slidably inserted into the radial channel 305, and a spring stop block 309 located at the lower end of the telescopic lock rod 308 and stopped outside the lock body compression spring 307. A lock rod inclined surface 310 is provided below the outer side of the telescopic lock rod 308, and the inner side of the telescopic lock rod 308 is inserted into the locking side hole 25.

[0068] The lifting assembly 42 also includes a pressing inclined block 426 disposed on the inner wall of the lifting ring 421 and a retaining protrusion 427 disposed below the pressing inclined block 426. The pressing inclined block 426 can slide through the through slide 304 and contact and cooperate with the locking rod inclined surface 310.

[0069] Furthermore, the limiting shaft groove 134 is provided in two sections, and the radial through hole 123 is provided in one section at the top and one section at the bottom;

[0070] The upper limiting shaft groove 134 is inserted into the limiting plug 425;

[0071] The lower limiting groove 134 is used to insert the extrusion wedge 426 and the retaining protrusion 427.

[0072] This invention relates to a welded ethylene oxide gas cylinder 7, comprising an outer tank 71, an inner tank 72, and a cap 73 screwed onto the outer tank 71. Furthermore, the inner wall of the outer tank 71 is circumferentially distributed with longitudinally arranged support frames 711, effectively ensuring the concentricity between the inner tank 72 and the outer tank 71, as well as subsequent strength. Further, the lower edge of the support frame 711 is provided with a guide slope, facilitating the insertion of the inner tank 72 into the outer tank 71 from bottom to top.

[0073] It should be noted that a one-way valve plate needs to be welded to the upper opening of the inner tank 72 to fill it with ethylene oxide gas and keep it sealed. When needed, it can be punctured by the puncture device of the medical sterilization equipment to release the ethylene oxide gas into the sterilization chamber for sterilization of the items to be sterilized.

[0074] The welding device described in this case is used to weld the annular gap between the upper surfaces of the outer tank 71 and the inner tank 72 of an ethylene oxide small gas cylinder 7 (the lower surfaces of the outer tank 71 and the inner tank 72 have already been welded to the bottom cover on other equipment). The specific steps are as follows: the ethylene oxide small gas cylinder 7 is placed in the fixture assembly 94 for fixation; the rotary positioner 93 drives the fixture assembly 94 and the ethylene oxide small gas cylinder 7 to rotate; and the laser welding arm 92 performs rotary sealing welding on the upper surfaces of the outer tank 71 and the inner tank 72.

[0075] The clamp assembly 94 in this case is easy to install and remove. The specific usage method is as follows:

[0076] As per the instruction manual Figure 4 , 5 As shown, this is state one, meaning it has not been installed yet:

[0077] The pressing sleeve 2 is in a high position, the radial lock body 3 is on the outside, and the lifting assembly 42 is in a low position and is locked by the radial lock body 3.

[0078] As per the instruction manual Figure 6 As shown, this is state two, meaning installation is in progress:

[0079] The ethylene oxide small gas cylinder 7 is pressed down into the pressing sleeve 2, and then pressed down. The ethylene oxide small gas cylinder 7 and the pressing sleeve 2 move downward against the damping of the central compression spring 5 (the ethylene oxide small gas cylinder 7 is not shown in the figure).

[0080] As the pressing sleeve 2 moves downward, the inner ring cone 23 and the deep-cut annular groove 22 are aligned with the lock body slider 301 in sequence.

[0081] The outer ring compression spring assembly 6 drives the lifting assembly 42 to move upward (at the same time, the lifting assembly 42 drives the rotating assembly 41 to rotate in the opposite direction).

[0082] The outer cone 424 of the lifting assembly 42 presses against the outer inclined surface 303 of the radial lock body 3, causing the lock body slider 301 to move radially inward into the deep-cut annular groove 22. The lifting assembly 42 continues to move upward, and the inner wall of the lifting ring 421 continuously presses against the radial lock body 301, preventing it from moving radially outward. The axial movement freedom of the pressing sleeve 2 is locked and will not pop up to reset.

[0083] As per the instruction manual Figure 7 As shown, this is state three, meaning installation is complete:

[0084] The lifting assembly 42 continues to move upward until the pressing inclined block 426 and the holding protrusion 427 of the lifting assembly 42 press the locking rod inclined surface 310, the spring stop block 309, and the telescopic locking rod 308 of the radial lock body 3, causing them to move inward against the action of the lock body compression spring 307. The telescopic locking rod 308 of the radial lock body 3 clamps the outer wall of the ethylene oxide small tank gas cylinder 7, quickly completing the clamping and fixing for subsequent welding.

[0085] After welding is completed, the ethylene oxide small tank storage cylinder 7 can be easily disassembled.

[0086] Rotating the rotating assembly 41 causes the active plug 413 of the rotating assembly 41 to act on the driven inclined groove 422 of the lifting assembly 42, thereby driving the lifting assembly 42 to overcome the resistance of the outer ring spring 61 of the outer ring spring assembly 6 and move downward until the lifting ring groove 423 of the lifting assembly 42 is aligned with the outer side of the lock body slider 301 of the radial lock body 3.

[0087] The lock body compression spring 307 drives the telescopic lock rod 308 to move outward and reset;

[0088] The central compression spring 5 acts on the pressing sleeve 2 to make it move upward and reset. The inner ring cone 23 of the pressing sleeve 2 squeezes the inner inclined surface 302 and the locking body slider 301 to make it move outward until it abuts the lifting ring groove 423 of the lifting assembly 42, so that the axial movement freedom of the lifting assembly 42 is locked.

[0089] It should be noted that the outer periphery of the torsion ring 411 of the rotating assembly 41 is provided with an anti-slip component; furthermore, the outer wall of the torsion ring 411 may also be detachably provided with a radially arranged torsion lever to amplify the torsional torque.

[0090] It should be noted that the damping of the retaining device 4 can also be adjusted in this case:

[0091] Rotating the inner threaded ring 62 of the outer ring compression spring assembly 6 drives the radial insert rod 64 and the compression spring bottom ring 63 to move longitudinally, adjusting the compression and damping of the outer ring spring 61 under normal conditions, thereby adjusting the downward resistance of the lifting assembly 42, and finally adjusting the damping of the rotating assembly 41 to drive the lifting assembly 42 to rotate.

Claims

1. A welding apparatus suitable for ethylene oxide small tank gas cylinders, comprising at least a frame (91), a laser welding arm (92), and a rotary positioner (93), characterized in that: It also includes a clamp assembly (94) mounted on the rotary positioner (93), the clamp assembly (94) comprising a clamp housing (1), a pressing sleeve (2), a radial locking body (3), a retaining device (4), a central compression spring (5), and an outer ring compression spring assembly (6): The clamp housing (1) includes a housing base (11), an internal chamber (12), and an external chamber (13); The outer casing base (11) includes a connecting flange (111) connected to the turntable of the rotary positioner (93), and also includes a lower narrow shaft (112) and a columnar base (113); the internal chamber (12) includes a guide opening (121) on the upper end face of the columnar base (113), a longitudinally arranged circular cavity (122) below the guide opening (121), radially arranged through holes (123) evenly distributed around the outer edge of the longitudinally arranged circular cavity (122), and a structure provided in the... The anti-rotation key (124) is located on the inner wall of the longitudinally placed circular cavity (122); the external cavity (13) includes an annular groove (131) located on the upper half of the outer wall of the columnar base (113), an annular lower cavity (132) located below the inner side of the annular groove (131), a limiting protrusion (133) located at the upper end of the annular groove (131), and limiting shaft grooves (134) evenly distributed circumferentially on the inner walls of the annular groove (131) and the annular lower cavity (132). The pressing sleeve (2) is slidably disposed in the built-in cavity (12). The pressing sleeve (2) includes a sleeve body (21) with an open upper end, a deep-cut annular groove (22) on the upper half of the outer wall of the sleeve body (21), an inner ring cone (23) with a narrow upper end and a wide lower end on the lower end of the deep-cut annular groove (22), and a anti-rotation longitudinal hole (24) on the outer wall of the sleeve body (21) and engaged with the anti-rotation key (124). The radial lock body (3) includes a lock body slider (301) that can slide inside the radial through hole (123), an inner inclined surface (302) inside the lock body slider (301), and an outer inclined surface (303) outside the lock body slider (301). The retaining device (4) includes a rotating assembly (41) and a lifting assembly (42). The rotating assembly (41) includes a rotatable torsion ring (411) disposed in the annular groove (131), an annular upper groove (412) disposed on the inner edge of the upper end of the torsion ring (411) and cooperating with the limiting protrusion ring (133), and an active plug (413) disposed on the inner wall of the torsion ring (411). The lifting assembly (42) includes a slidable lower part of the annular groove (411) disposed on the inner wall of the torsion ring (411). The cavity (132) contains a lifting ring body (421), a driven inclined groove (422) located on the outer wall of the lifting ring body (421) and connected to the active plug (413), a lifting ring groove (423) located above the inner wall of the lifting ring body (421), an outer ring cone (424) located at the lower edge of the lifting ring groove (423) with a wider upper part and a narrower lower part, and a limiting plug (425) located on the inner wall of the lifting ring groove (423) and connected to the limiting shaft groove (134). The central compression spring (5) is located in the longitudinally placed circular cavity (122) below the pressing sleeve (2); The outer ring spring assembly (6) includes an outer ring spring (61) disposed in the annular lower cavity (132) below the lifting assembly (42).

2. The welding device for ethylene oxide small tank gas cylinders according to claim 1, characterized in that: The pressing sleeve (2) also includes locking side holes (25) that are circumferentially distributed along the outer edge of the sleeve body (21) and correspond one-to-one with the radial through holes (123). The radial lock body (3) further includes a through slide (304) that runs longitudinally through the middle of the outer side of the lock body slider (301), a radial channel (305) that runs radially within the lock body slider (301), a lower spring cavity (306) located below the radial channel (305), a lock body compression spring (307) located within the lower spring cavity (306), a telescopic lock rod (308) that is slidably inserted into the radial channel (305), and a spring stop block (309) located at the lower end of the telescopic lock rod (308) and stopped outside the lock body compression spring (307). A lock rod inclined surface (310) is provided below the outer side of the telescopic lock rod (308), and the inner side of the telescopic lock rod (308) is inserted into the locking side hole (25). The lifting assembly (42) also includes a pressing inclined block (426) disposed on the inner wall of the lifting ring (421) and a retaining protrusion (427) disposed below the pressing inclined block (426). The pressing inclined block (426) can slide through the through slide (304) and contact and cooperate with the locking rod inclined surface (310).

3. The welding device for ethylene oxide small tank gas cylinders according to claim 2, characterized in that: The limiting shaft groove (134) is provided in two sections, and the radial through hole (123) is provided in one section at the top and one section at the bottom; The upper limiting shaft groove (134) is inserted into the limiting plug (425); The lower limiting groove (134) is used to insert the extrusion wedge (426) and the retaining protrusion (427).

4. The welding device for ethylene oxide small tank gas cylinders according to claim 3, characterized in that: The external chamber (13) also includes an adjustment ring groove (135) located on the lower half of the outer wall of the columnar base (113) and adjustment side holes (136) evenly distributed along the inner edge of the adjustment ring groove (135) and communicating with the annular lower cavity (132).

5. The welding device for ethylene oxide small tank gas cylinders according to claim 4, characterized in that: The outer ring compression spring assembly (6) also includes a rotatable internal threaded ring (62) disposed in the adjusting ring groove (135), a compression spring bottom ring (63) disposed in the lower annular cavity (132) below the outer ring spring (61), and radial inserts (64) circumferentially distributed on the outer periphery of the compression spring bottom ring (63) and inserted into the adjusting side hole (136). The distal end of the radial insert (64) is formed with an external thread that is screwed into the internal threaded ring (62).

6. The welding apparatus for ethylene oxide small tank gas cylinders according to claim 5, characterized in that: The radial through holes (123) are provided in four places.

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