A reservoir welding protection device

Abstract

The application discloses a kind of liquid reservoir welding protection devices, it is related to welding equipment technical field, including adjusting mechanism, the adjusting mechanism top is connected with base, the adjusting mechanism is used to realize base angle rotation, the base other end is equipped with lower fixed mechanism, the lower fixed mechanism is interconnected with upper fixed mechanism, and upper fixed mechanism is located just above lower fixed mechanism, and the lower fixed mechanism is used to cooperate with upper fixed mechanism to the end cap and tank body fixed.The device uses, the tank body and end cap assembly positioning are positioned between upper snap ring and lower snap ring, while the upper snap ring is buckled, the first communication groove in the inside of upper snap ring and the second communication groove in the inside of lower snap ring realize accurate docking communication, and first gas groove and second gas groove are enclosed to form the closed ring-shaped gas path around the ring gap of tank body and end cap, to provide continuous stable protection gas passage for weld.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and in particular to a welding protection device for a liquid reservoir. Background Technology

[0002] Liquid receivers are pressure vessels commonly used in refrigeration, air conditioning, and hydraulic systems. The quality of the circumferential weld between the tank body and the end cap directly affects the product's sealing performance, structural strength, and service life. Current liquid receiver welding techniques mostly employ simple clamps for positioning and external spray guns for single-point purging for welding protection. This method generally suffers from limited protection, insufficient venting within the tank, and poor structural interlocking, making it difficult to meet high-quality welding requirements. Specific technical defects are as follows: On the one hand, the outer shielding of the weld is discontinuous and lacks an independent preheating and slow cooling channel, making it prone to oxidation, cracking, and poor forming quality. Traditional welding equipment cannot form a closed annular gas path around the weld by using upper and lower retaining rings, and can only rely on local purging for protection. The shielding gas flow is easy to diffuse, and it cannot achieve full inert protection before, during, and after welding. The welded seam is prone to secondary oxidation. At the same time, the lack of an independent and closed heating channel means that the shielding gas comes into direct contact with the molten pool without preheating. The low-temperature gas flow is prone to impacting the molten pool, resulting in poor forming. Furthermore, the rapid cooling of the weld after welding can easily generate internal stress, leading to problems such as embrittlement, cracking, and deformation, which seriously affects the strength of the welded joint.

[0003] On the other hand, the lack of an effective nitrogen filling and oxygen removal structure inside the tank makes the inner wall welds extremely prone to oxidation, resulting in very poor protection. Existing technologies generally lack the function of providing overall nitrogen protection for the internal cavity of the tank. Even when internal blowing is used, it is mostly single-point direct blowing, and nitrogen cannot be evenly diffused inside the tank. It is easy to mix with residual air and cannot achieve sufficient oxygen replacement. A large amount of oxygen always remains inside the tank, which will react with the inner wall welds at the high temperature of welding, forming defects such as oxidation inclusions, porosity, and leakage, resulting in a significant decrease in the airtightness and reliability of the liquid storage tank.

[0004] To address the numerous drawbacks of the existing technologies, this application proposes a welding protection device for liquid reservoirs, which achieves dual nitrogen protection (internal and external), preheating and slow cooling, and thorough venting, thereby significantly improving welding quality and product stability. Summary of the Invention

[0005] One objective of this invention is to provide a welding protection device for liquid storage tanks, which solves the problems of poor welding protection and easy oxidation of the inner wall in existing equipment.

[0006] According to an embodiment of the present invention, a welding protection device for a liquid reservoir includes an adjusting mechanism. A base is connected to the top of the adjusting mechanism, which is used to rotate the base. A lower fixing mechanism is installed at the other end of the base. The lower fixing mechanism is connected to an upper fixing mechanism, and the upper fixing mechanism is located directly above the lower fixing mechanism. The lower fixing mechanism is used to cooperate with the upper fixing mechanism to fix the end cap to the tank body. An exhaust mechanism is connected to one end of the base, which is used for venting air from inside the tank. A support frame is provided at one end of the tank body. The bottom of the support frame is fixedly connected to the base by bolts. Ball bearings are installed on the surface of the support frame to reduce friction with the outer wall of the tank body. A driving mechanism is provided between the lower fixing mechanism and the support frame. The driving mechanism is installed on the surface of the base and contacts the outer wall of the tank body. The driving mechanism is used to drive the tank body to rotate.

[0007] Preferably, the adjustment mechanism includes a mounting plate with mounting holes on both ends for fixing the mounting plate. Two first connecting blocks are provided on the top of the mounting plate. The first connecting blocks are fixedly connected to the mounting plate, and one side of the first connecting block is connected to the bottom end of the first spring. The top end of the first spring is connected to one side of the base. The other end of the mounting plate is fixedly connected to the first connecting block by screws. The top end of the first connecting block is rotatably connected to the base. A support block is installed in the middle of the top of the base. One end of the support block has a sloping structure, and the top of the support block is in contact with the bottom surface of the base. The mounting plate ensures a stable overall installation. The first connecting block and the first spring work together to allow the base to rotate flexibly and have an automatic reset capability. The support block adopts a slope structure and can form an inclined surface with the guide block, so that the base angle tilts synchronously with the feed of the exhaust mechanism, ensuring the stability and reliability of the tank's tilt posture and improving the internal exhaust and nitrogen filling protection effect.

[0008] Preferably, the exhaust mechanism includes a movable frame, with sliding grooves on both sides of the bottom of the movable frame. The sliding grooves slide in contact with the slots on the surface of the base. A guide block is provided at the bottom of the movable frame. The bottom of the guide block has a sloping structure. The guide block slides in contact with the top surface of the support block. One side of the movable frame is rotatably connected to one end of a first threaded rod. The first threaded rod is threadedly connected to one end of the base. A handle is fixedly installed at one end of the first threaded rod. A sealing block is fixedly installed on one side of the top of the movable frame. An air inlet is provided inside the sealing block. The moving frame is smoothly fed by the handle and the first threaded rod. The slide groove ensures the movement accuracy of the moving frame. The inclined surfaces of the guide block and the support block cooperate to achieve synchronous linkage between the sealed feed and the tilting of the base. The sealing block can tightly seal the end cap opening. The air inlet can evenly deliver nitrogen into the tank, improving the air replacement efficiency and sealing reliability inside the tank.

[0009] Preferably, a first bracket is inserted inside the sealing block. One end of the first bracket is fixedly connected to the inside of the sealing block, and the other end of the first bracket is rotatably connected to the end of a second bracket. A connecting pipe is fixedly installed inside both the first and second brackets. The part of the connecting pipe near the connection between the first and second brackets has a corrugated structure, and a slot is opened at the end of the connecting pipe. A third connecting block is fixedly installed on both sides of the first bracket. The third connecting block is fixedly connected to one end of a second spring, and the other end of the second spring is fixedly connected to the second bracket. The first and second supports can rotate to adapt to the curvature of the inner wall of the tank. The second spring pulls the second support to make the connecting pipe automatically tilt up and fit tightly against the inner wall of the tank. The corrugated connecting pipe can adapt to bending and deformation. The end slots facilitate the intake and discharge of residual oxygen at the top of the tank, so as to fully discharge oxygen in the tank and significantly improve the protection effect of the inner wall weld.

[0010] Preferably, the upper fixing mechanism includes an upper retaining ring, with first rollers installed on both sides of the upper retaining ring. The first rollers are distributed at equal intervals. The upper retaining ring has an arc-shaped structure, and a first air groove is formed on the inner wall of the upper retaining ring. A first connecting groove is formed inside the upper retaining ring, with both ends of the first connecting groove being open. A hook is fixedly installed on one end of the upper retaining ring. First sealing strips are distributed on both sides of the first air groove. The first sealing strips are fixedly connected to the surface of the upper retaining ring. The surface of the first sealing strip has a corrugated structure and is in contact with the surface of the tank. The first connecting groove and the first air groove are made of copper-aluminum composite material, which is beneficial for heat exchange. The upper retaining ring fits the tank body well, the first roller reduces the rotational friction of the tank body and ensures the concentricity of rotation, the first air groove forms an annular protective air cavity, the first connecting groove is used for steam circulation, the copper-aluminum composite material improves heat exchange efficiency, can quickly preheat nitrogen and evenly heat the weld area, the corrugated first sealing strip improves the sealing effect, prevents nitrogen leakage and air infiltration, and the hook facilitates quick locking and fixing.

[0011] Preferably, the lower fixing mechanism includes a lower retaining ring, the lower retaining ring having a second connecting groove inside, the two ends of the second connecting groove being open, and a second gas groove being formed on the inner surface of the lower retaining ring. A buckle is fixedly installed at one end of the upper retaining ring, the buckle being connected to a hook, and the other end of the lower retaining ring being rotatably connected to the upper retaining ring. Second rollers are installed on both sides of the lower retaining ring, the second rollers being distributed in an arc shape with equal spacing, and a second sealing strip is fixedly installed on both sides of the lower retaining ring. The surface of the second sealing strip has a corrugated structure, and the second sealing strip is in contact with the surface of the tank. The second gas groove on the surface of the lower retaining ring is connected to a nitrogen pipe, and the second connecting groove inside the lower retaining ring is connected to an air inlet pipe and an air return pipe. The two ends of the second connecting groove are not connected, and the second connecting groove is composed of two arc-shaped channels. The air inlet pipe is connected to an external high-temperature steam source, and the nitrogen pipe is connected to one end of the bottom of the corrugated pipe. One end of the top of the corrugated pipe is connected to one end of a connecting pipe. The space between the second connecting groove and the second gas groove is made of copper-aluminum composite material. After the lower and upper retaining rings are engaged, a complete annular protective structure is formed. The second roller and the second sealing strip further improve the stability and airtightness of the tank rotation. The second gas groove is used for annular nitrogen protection. The second connecting groove forms an independent and closed steam channel. The copper-aluminum composite material improves heating and heat exchange efficiency. Steam does not come into direct contact with the weld and nitrogen, avoiding water vapor from affecting the welding quality. The nitrogen pipe and the corrugated pipe can simultaneously provide nitrogen to the external annular seam and the inside of the tank, achieving double protection inside and outside.

[0012] Preferably, the lower retaining ring is fixedly installed with support feet on both sides of the bottom, the support feet are slidably connected to the protruding structure on the top of the base, and the support feet are provided with third adjusting bolts on both sides. The third adjusting bolts are slidably in contact with the holes and grooves on the surface of the protruding structure on the top of the base, and the external threads of the third adjusting bolts are connected with adjusting nuts. The support foot can slide along the base to adjust the position of the lower retaining ring. The third adjusting bolt and adjusting nut realize the positioning and locking of the lower retaining ring, improving the versatility and clamping accuracy of the device and ensuring the precise and stable welding position.

[0013] Preferably, the driving mechanism includes a drive motor mounted on the base surface, and a transmission wheel is keyed to the output end of the drive motor. The transmission wheel is connected to the driven wheel via a transmission belt. The driven wheel is connected to a transmission gear via a driven shaft. The driven shaft is rotatably connected to one side of the lifting block. Both the driven wheel and the transmission gear are fixedly mounted outside the driven shaft. The transmission gear and the driven gear mesh with each other. The driven gear is connected to a support wheel via a support shaft. One end of the support shaft is rotatably connected to the lifting block, and the support wheel is in close contact with the bottom surface of the tank. The surface of the support wheel is made of rubber. The drive motor achieves stable power transmission through belt drive and gear meshing. The rubber support wheel has moderate friction, which can smoothly drive the tank to rotate and ensure uniform welding speed of the circumferential seam. The lifting block can drive the support wheel to lift as a whole, adapting to tanks of different diameters and improving the applicability of the device and the consistency of welding.

[0014] Preferably, two second adjusting bolts are fixedly connected to one side of the lifting block. A nut is threaded to one end of each second adjusting bolt, and the second adjusting bolt slides in contact with the internal slot of the angle iron. The angle iron is fixedly connected to the base. The bottom of the lifting block slides in contact with the top of the adjusting block. The top of the adjusting block is sloped, and the contact surface between the bottom of the lifting block and the adjusting block is sloped. The bottom of the adjusting block slides in connection with the fixed block. The fixed block is fixedly installed on the surface of the base, and one end of the fixed block is threaded to one end of the adjusting screw, and the adjusting screw is threaded to one end of the adjusting block. The adjustment screw drives the adjustment block to move horizontally, and the slope is used to convert the horizontal movement into the vertical lifting of the lifting block, so as to achieve precise adjustment of the support wheel height. The second adjustment bolt and the angle iron play a guiding and limiting role, preventing the lifting block from swaying, improving the fitting accuracy between the support wheel and the tank body, ensuring the tank body rotates smoothly and has high concentricity, and improving the quality of the circumferential weld.

[0015] The beneficial effects of this invention are: In use, the device of this invention positions the tank body and end cap between the upper and lower retaining rings, with the end of the tank body supported and positioned by a support frame. The upper retaining ring is rotated to engage with the lower retaining ring, and the first rollers on both sides of the upper retaining ring press the end cap against the outer wall of the tank body, achieving precise clamping and fixing of the assembly position. The upper and lower retaining rings are then reliably locked by the locking of the latches and hooks. Simultaneously with the engagement of the upper and lower retaining rings, the first connecting groove inside the upper retaining ring and the second connecting groove inside the lower retaining ring achieve precise connection. The first and second gas grooves form a closed annular gas path surrounding the seam between the tank body and the end cap, providing a continuous and stable protective gas channel for the weld. The nitrogen pipe is connected to an external nitrogen source. Nitrogen gas enters the second gas groove through the nitrogen pipe and flows into the first gas groove, finally exiting through the top opening of the first gas groove. A counter-current converging airflow is formed at the top of the first gas groove, creating a stable and uniform convective protective atmosphere in the welding area. This ensures that the weld pool and high-temperature weld are under nitrogen protection throughout the entire process, effectively isolating air and preventing oxidation. Simultaneously, the drive motor drives the support wheel to rotate at a uniform speed through a transmission mechanism consisting of a transmission wheel, driven wheel, transmission gear, driven gear, and support shaft. The support wheel is in close contact with the bottom of the tank and drives the tank to rotate slowly circumferentially, keeping the welding point at the top of the tank and the molten pool facing upwards. The welding position remains at the top of the first gas groove. During welding, the molten pool naturally flows downwards under the action of gravity, resulting in a full and fully fused weld, significantly improving welding quality. Combined with the guiding and sealing effect of the rollers on the upper and lower retaining rings and the sealing strip, smooth and continuous rotary welding of the tank is achieved, ensuring uniform and consistent circumferential welding of the circumferential seam, further improving welding quality and stability. Simultaneously, when the upper and lower retaining rings are engaged and locked, the first and second connecting grooves inside them interlock to form an independent and closed annular heating channel. This channel is isolated from the outer welding area and protective gas path, preventing the high-temperature steam medium from directly contacting the weld and nitrogen, thus eliminating the adverse effects of water vapor on welding quality. During operation, external high-temperature steam enters the second connecting groove through the inlet pipe, flows sequentially through the second connecting groove and the first connecting groove, and is discharged from the other side of the second connecting groove and the return pipe, forming a continuous circulating heating circuit to uniformly heat the first and second gas grooves. On the one hand, the high-temperature steam can preheat the nitrogen in the gas grooves, avoiding the direct purging of the molten pool by low-temperature nitrogen, which would cause rapid cooling and poor forming of the molten pool, ensuring a stable welding process. On the other hand, the rotation of the tank causes the weld to continuously pass through the heated first and second gas grooves after welding, enabling the weld to achieve uniform and slow cooling, avoiding excessive internal stress caused by a sudden drop in temperature, which could lead to weld embrittlement and cracking, significantly improving the strength and structural reliability of the welded joint.

[0016] After the tank body and end cap are clamped and fixed, turn the handle to drive the first threaded rod to rotate. The first threaded rod pushes the moving frame to move horizontally along the base. Simultaneously, the moving frame drives the sealing block forward, so that the sealing block fits tightly with the end cap opening, achieving a reliable seal at the end cap port. At the same time, the sealing block drives the second bracket and connecting pipe to extend into the end cap and tank body. Under the tension of the second spring, the end of the connecting pipe automatically tilts upward and extends adaptively along the inner wall of the tank to the top position of the tank. During the same process of the moving frame's horizontal movement, its bottom guide block moves synchronously and cooperates with the support block on the base through the inclined structure, pushing the base to rotate upward around the hinge end, so that the base and tank body simultaneously form an inclined posture, thereby ensuring that the tilted end of the connecting pipe is precisely at the highest point inside the tank body. External nitrogen gas is delivered to the inlet of the sealing block via a nitrogen pipe and a bellows, continuously filling the internal cavity of the tank. Under gravity, the nitrogen slowly settles from top to bottom, pushing residual oxygen within the tank to its highest point. This oxygen is then drawn in through the raised end of the connecting pipe and discharged outwards, achieving complete replacement and purging of the oxygen within the tank. During the welding process, a stable nitrogen protective atmosphere is maintained inside the tank, ensuring the inner wall of the weld is under inert gas protection throughout, preventing oxidation of the inner wall during high-temperature welding, and effectively improving the forming quality and airtightness of the weld inner wall. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a welding protection device for a liquid reservoir proposed in this invention; Figure 2 This is a schematic diagram of the operation of a welding protection device for a liquid reservoir proposed in this invention.

[0018] Figure 3 This is a side view of a welding protection device for a liquid reservoir proposed in this invention.

[0019] Figure 4 This is a schematic diagram of the adjustment mechanism of a welding protection device for a liquid reservoir proposed in this invention.

[0020] Figure 5 This is a schematic diagram of the exhaust mechanism of a welding protection device for a liquid reservoir proposed in this invention.

[0021] Figure 6 This is a schematic diagram of the connecting pipe structure of a welding protection device for a liquid reservoir proposed in this invention.

[0022] Figure 7 This invention proposes a welding protection device for a liquid storage tank. Figure 6Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the lower fixing mechanism of a welding protection device for a liquid reservoir proposed in this invention.

[0023] Figure 9 This is a schematic diagram of the upper fixing mechanism of a welding protection device for a liquid reservoir proposed in this invention.

[0024] Figure 10 This invention proposes a welding protection device for a liquid storage tank. Figure 4 Enlarged structural diagram at point A in the middle.

[0025] Figure 11 This is a schematic diagram of the lifting block structure of a welding protection device for a liquid reservoir proposed in this invention.

[0026] Figure 12 This is a schematic diagram of the adjusting block structure of a welding protection device for a liquid reservoir proposed in this invention.

[0027] In the diagram: 1. Adjustment mechanism; 11. Mounting plate; 12. First connecting block; 13. Support block; 14. Second connecting block; 15. First spring; 2. Base; 3. Exhaust mechanism; 31. Handle; 32. First threaded rod; 33. Moving frame; 34. Guide block; 35. Slide groove; 36. Air inlet; 37. Sealing block; 38. Second bracket; 39. Connecting pipe; 310. First bracket; 311. Third connecting block; 312. Second spring; 4. Upper fixing mechanism; 41. Upper retaining ring; 42. First roller; 43. First air groove; 44. First connecting groove; 45. Hook; 46. First sealing strip; 5. Lower fixing mechanism; 51. Lower retaining ring; 52. 53. Second connecting groove; 54. Second gas groove; 55. Second roller; 56. Second sealing strip; 57. Fastener; 58. Inlet pipe; 59. Nitrogen pipe; 50. Corrugated pipe; 510. Support foot; 511. Third adjusting bolt; 512. Adjusting nut; 513. Return gas pipe; 6. End cap; 7. Tank body; 8. Support frame; 91. Drive mechanism; 92. Drive motor; 93. Transmission wheel; 94. Driven wheel; 95. Transmission gear; 96. Driven shaft; 97. Support shaft; 98. Support wheel; 99. Lifting block; 910. Second adjusting bolt; 911. Adjusting block; 912. Fixing block; 913. Angle iron; 914. Adjusting screw. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0029] refer to Figure 1-3The system includes an adjustment mechanism 1, a base 2 connected to the top of the adjustment mechanism 1, and the adjustment mechanism 1 is used to rotate the base 2 at an angle. A lower fixing mechanism 5 is installed at the other end of the base 2. The lower fixing mechanism 5 is connected to an upper fixing mechanism 4, and the upper fixing mechanism 4 is located directly above the lower fixing mechanism 5. The lower fixing mechanism 5 is used to cooperate with the upper fixing mechanism 4 to fix the end cap 6 to the tank body 7. An exhaust mechanism 3 is connected to one end of the base 2. The exhaust mechanism 3 is used for exhausting the tank body 7. A support frame 8 is provided at one end of the tank body 7. The bottom of the support frame 8 is fixedly connected to the base 2 by bolts. Ball bearings are installed on the surface of the support frame 8 to reduce friction with the outer wall of the tank body 7. A drive mechanism 9 is provided between the lower fixing mechanism 5 and the support frame 8. The drive mechanism 9 is installed on the surface of the base 2 and contacts the outer wall of the tank body 7. The drive mechanism 9 is used to drive the tank body 7 to rotate. This implementation scheme, through the overall coordinated layout of the adjustment mechanism 1, base 2, upper and lower fixing mechanisms 5, exhaust mechanism 3, support frame 8 and drive mechanism 9, can stably position and reliably clamp the tank 7 and end cap 6. It can realize the adaptive adjustment of the angle of the base 2, the full nitrogen filling and exhaust of the tank 7, the smooth rotation drive of the tank 7, and the double protection of the weld seam inside and outside. It effectively solves the problems of insufficient exhaust of the tank 7, easy oxidation of the inner wall and poor protection effect in the prior art, significantly improves the stability, airtightness and welding quality of the circumferential weld of the liquid storage device, and improves the adaptability and reliability of the device.

[0030] Referring to Figure 4-7, the adjusting mechanism 1 includes a mounting plate 11. Mounting holes are provided on both ends of the mounting plate 11 for fixing it. Two first connecting blocks 12 are provided on the top of the mounting plate 11, and the first connecting blocks 12 are fixedly connected to the mounting plate 11. One side of the first connecting block 12 is connected to one bottom end of the first spring 15, and one top end of the first spring 15 is connected to one side of the base 2. The other end of the mounting plate 11 is fixedly connected to the first connecting block 12 by screws. One top end of the first connecting block 12 is rotatably connected to the base 2. A support block 13 is installed in the middle of the top of the base 2. One end of the support block 13 has a sloping structure, and the top of the support block 13 is in contact with the bottom surface of the base 2. The exhaust mechanism 3 includes a movable frame 33. Slide grooves 35 are provided on both sides of the bottom of the movable frame 33. The slide grooves 35 slide in contact with the slots on the surface of the base 2. A guide block 34 is provided at the bottom of the movable frame 33. The bottom of the guide block 34 has a sloping structure, and the guide block 34 is connected to the support block 13. The top surface slides in contact with the movable frame 33. One side of the movable frame 33 is rotatably connected to one end of the first threaded rod 32. The first threaded rod 32 is threadedly connected to one end of the base 2. A handle 31 is fixedly installed at one end of the first threaded rod 32. A sealing block 37 is fixedly installed on one side of the top of the movable frame 33. An air inlet 36 is opened inside the sealing block 37. A first bracket 310 is inserted inside the sealing block 37. One end of the first bracket 310 is fixedly connected to the inside of the sealing block 37. The other end of the first bracket 310 is rotatably connected to the end of the second bracket 38. A connecting pipe 39 is fixedly installed inside both the first bracket 310 and the second bracket 38. The part of the connecting pipe 39 near the connection between the first bracket 310 and the second bracket 38 has a corrugated structure. A slot is opened at the end of the connecting pipe 39. A third connecting block 311 is fixedly installed on both sides of the first bracket 310. The third connecting block 311 is fixedly connected to one end of the second spring 312. The other end of the second spring 312 is fixedly connected to the second bracket 38. In this embodiment, after the tank body 7 and end cap 6 are clamped and fixed, the handle 31 is rotated to drive the first threaded rod to rotate. The first threaded rod pushes the moving frame 33 to move horizontally along the base 2. The moving frame 33 simultaneously drives the sealing block 37 to move forward, so that the sealing block 37 and the opening of the end cap 6 are tightly fitted, achieving a reliable seal at the end cap 6 port. At the same time, the sealing block 37 drives the second bracket 38 and the connecting pipe 39 to extend into the end cap 6 and the tank body 7 together. Under the tension of the second spring 312, the end of the connecting pipe 39 automatically tilts upward and extends adaptively along the inner wall of the tank body 7 to the top position of the tank body 7. During the same process of the moving frame 33 moving horizontally, the guide block 34 at its bottom moves synchronously and cooperates with the support block 13 on the base 2 through the inclined structure, pushing the base 2 to rotate upward around the hinge end, so that the base 2 and the tank body 7 simultaneously form an inclined posture, thereby making the tilted end of the connecting pipe 39 precisely at the highest point inside the tank body 7. External nitrogen gas is delivered to the inlet 36 of the sealing block 37 via nitrogen pipe 58 and bellows pipe 59, continuously filling the internal cavity of the tank 7. Under the influence of gravity, the nitrogen gas slowly settles from top to bottom, pushing the residual oxygen in the tank 7 to accumulate at the highest point. This oxygen is then drawn in through the raised end of the connecting pipe 39 and discharged outwards, achieving full replacement and complete evacuation of oxygen from the tank 7. During the welding process, a stable nitrogen protective atmosphere is maintained inside the tank 7, ensuring that the inner wall of the weld is under inert gas protection throughout the process. This prevents oxidation of the inner wall during high-temperature welding, effectively improving the forming quality and airtightness of the weld inner wall.

[0031] refer to Figure 8-12The upper fixing mechanism 4 includes an upper retaining ring 41, with first rollers 42 installed on both sides of the upper retaining ring 41. The first rollers 42 are evenly spaced. The upper retaining ring 41 has an arc-shaped structure, and a first air groove 43 is formed on the inner wall of the upper retaining ring 41. A first connecting groove 44 is formed inside the upper retaining ring 41, with both ends of the first connecting groove 44 being open. A hook 45 is fixedly installed on one end of the upper retaining ring 41. First sealing strips 46 are distributed on both sides of the first air groove 43. The first sealing strips 46 are fixedly connected to the surface of the upper retaining ring 41. The surface of the first sealing strips 46 has a corrugated structure and is in contact with the surface of the tank body 7. The lower fixing mechanism 5 includes a lower retaining ring 51, with the lower retaining ring 51 having an inner... A second connecting groove 52 is provided, with both ends of the second connecting groove 52 being open. A second gas groove 53 is provided on the inner surface of the lower retaining ring 51. A buckle 56 is fixedly installed at one end of the upper retaining ring 41, and the buckle 56 is connected to the hook 45. The other end of the lower retaining ring 51 is rotatably connected to the upper retaining ring 41. Second rollers 54 are installed on both sides of the lower retaining ring 51, and the second rollers 54 are distributed in an arc shape with equal spacing. A second sealing strip 55 is fixedly installed on both sides of the lower retaining ring 51. The surface of the second sealing strip 55 has a corrugated structure, and the second sealing strip 55 is in contact with the surface of the tank body 7. The second gas groove 53 on the surface of the lower retaining ring 51 is connected to the nitrogen pipe 58, and the second connecting groove 53 inside the lower retaining ring 51 is also connected to the nitrogen pipe 58. 2 is connected to the intake pipe 57 and the return pipe 513, and the two ends of the second connecting groove 52 are not connected. The second connecting groove 52 is composed of two arc-shaped channels. The intake pipe 57 is connected to the external high-temperature steam source, and the nitrogen pipe 58 is connected to one end of the bottom of the corrugated pipe 59. The top section of the corrugated pipe 59 is connected to one end of the connecting pipe 39. Support feet 510 are fixedly installed on both sides of the bottom of the lower retaining ring 51. The support feet 510 are slidably connected to the protruding structure on the top of the base 2. The support feet 510 are provided with third adjusting bolts 511 on both sides. The third adjusting bolts 511 are slidably contacted with the holes and grooves on the surface of the protruding structure on the top of the base 2, and the external threads of the third adjusting bolts 511 are connected to adjusting nuts 512. Drive Mechanism 9 includes a drive motor 91, which is mounted on the surface of the base 2. The output end of the drive motor 91 is keyed to a transmission wheel 92. The transmission wheel 92 is connected to the driven wheel 93 via a transmission belt. The driven wheel 93 is connected to the transmission gear 94 via a driven shaft 95. The driven shaft 95 is rotatably connected to one side of the lifting block 99. Both the driven wheel 93 and the transmission gear 94 are fixedly mounted on the outside of the driven shaft 95. The transmission gear 94 and the driven gear 96 mesh with each other. The driven gear 96 is connected to the support wheel 98 via a support shaft 97. One end of the support shaft 97 is rotatably connected to the lifting block 99. The support wheel 98 is in close contact with the bottom surface of the tank. The surface of the support wheel 98 is made of rubber.Two second adjusting bolts 910 are fixedly connected to one side of the lifting block 99. A nut is threaded to one end of the second adjusting bolt 910, and the second adjusting bolt 910 slides in contact with the internal slot of the angle iron 913. The angle iron 913 is fixedly connected to the base 2. The bottom of the lifting block 99 slides in contact with the top of the adjusting block 911. The top of the adjusting block 911 is sloping, and the contact surface between the bottom of the lifting block 99 and the adjusting block 911 is sloping. The bottom of the adjusting block 911 is slidably connected to the fixing block 912. The fixing block 912 is fixedly installed on the surface of the base 2, and one end of the fixing block 912 is threadedly connected to one end of the adjusting screw 914. The adjusting screw 914 is also threadedly connected to one end of the adjusting block 911. In this embodiment, when the device is in use, the tank body 7 and the end cap 6 are assembled and positioned between the upper retaining ring 41 and the lower retaining ring 51, with the end of the tank body 7 supported and positioned by the support frame 8. The upper retaining ring 41 is rotated to engage with the lower retaining ring 51, and the first rollers 42 on both sides of the upper retaining ring 41 press the end cap 6 and the outer wall of the tank body 7 to achieve precise clamping and fixing of the assembly position. Then, the upper and lower retaining rings 51 are reliably locked by the locking of the buckle 56 and the hook 45. At the same time as the upper and lower retaining rings 51 are engaged, the first connecting groove 44 inside the upper retaining ring 41 and the second connecting groove 52 inside the lower retaining ring 51 are precisely connected and aligned. The first air groove 43 and the second air groove 53 form a closed annular air path around the annular seam of the tank body 7 and the end cap 6, providing a continuous and stable protective air channel for the weld. The nitrogen pipe 58 is connected to an external nitrogen source. Nitrogen gas enters the second gas tank 53 through the nitrogen pipe 58 and then flows into the first gas tank 43, finally exiting through the top opening of the first gas tank 43. This creates a converging airflow at the top of the first gas tank 43, forming a stable and uniform convective protective atmosphere in the welding area. This ensures that the weld pool and high-temperature weld are under nitrogen protection throughout the entire process, effectively isolating air and preventing oxidation. Rotating the adjusting screw 914 drives the adjusting block 911 to move horizontally along the fixed block 912. The top of the adjusting block 911 has a sloping structure, which cooperates with the bottom slope of the lifting block 99, converting the horizontal displacement into the vertical lifting motion of the lifting block 99. The lifting block 99 achieves vertical guidance and limitation through the sliding engagement of the second adjusting bolts 910 on both sides with the slots of the angle iron 913. By adjusting the second adjusting bolts 910 and the nuts, the lifting stroke and installation position of the lifting block 99 can be limited, ensuring smooth lifting movement and reliable positioning. When the lifting block 99 is raised or lowered, it synchronously drives the support wheel 98 to move up and down, thereby adjusting the contact height and clamping force between the support wheel 98 and the outer wall of the tank body 7. At the same time, the drive motor 91 drives the support wheel 98 to rotate at a constant speed through a transmission mechanism consisting of the transmission wheel 92, driven wheel 93, transmission gear 94, driven gear 96, and support shaft 97. The support wheel 98 is in close contact with the bottom of the tank body 7 and drives the tank body 7 to rotate slowly in a circumferential direction, so that the welding point is always kept at the top of the tank body 7, the molten pool is always in an upward state, and the welding position is kept at the top of the first gas groove 43. During welding, the molten pool naturally fills and flows downward under the action of gravity, so that the weld is fully formed and fully fused, significantly improving the welding quality. With the guiding and sealing effect of the rollers on the upper and lower retaining rings 51 and the sealing strip, the tank body 7 can be smoothly and continuously rotated for welding, ensuring that the circumferential welding of the circumferential seam is uniform and consistent, further improving the welding formation quality and welding stability. Simultaneously, when the upper retaining ring 41 and the lower retaining ring 51 are fastened together, the first connecting groove 44 and the second connecting groove 52 inside them interlock to form an independent and closed annular heating channel. This channel is isolated from the outer welding area and the protective gas path, and the high-temperature steam medium will not come into direct contact with the weld and nitrogen, thus preventing water vapor from adversely affecting the welding quality. During operation, external high-temperature steam is introduced into the second connecting groove 52 through the air inlet pipe 57, flows through the second connecting groove 52 and the first connecting groove 44 in sequence, and is discharged from the other side of the second connecting groove 52 and the return air pipe 513, forming a continuous circulating heating circuit to uniformly heat the first gas groove 43 and the second gas groove 53. On the one hand, high-temperature steam can preheat the nitrogen in the gas tank, avoiding the direct blowing of low-temperature nitrogen into the molten pool, which would cause the molten pool to cool rapidly and form poorly, thus ensuring the stability of the welding process. On the other hand, the rotation of the tank body 7 drives the weld to continuously pass through the heated first gas tank 43 and second gas tank 53 after welding, so that the weld can achieve uniform and slow cooling, avoiding excessive internal stress caused by a sudden drop in temperature, which would lead to embrittlement and cracking of the weld, and significantly improving the strength and structural reliability of the welded joint.

[0032] Working principle: Before operation, the tank body 7 and end cap 6 are assembled and positioned accordingly, and placed as a whole between the upper retaining ring 41 of the upper fixing mechanism 4 and the lower retaining ring 51 of the lower fixing mechanism 5. The tail of the tank body 7 is supported by the support frame 8, which is fixed to the base 2 by bolts. The ball bearings on the surface of the support frame 8 contact the outer wall of the tank body 7, effectively reducing the frictional resistance when the tank body 7 rotates. Then, the upper retaining ring 41 is rotated to engage with the lower retaining ring 51. The first rollers 42, which are evenly distributed on both sides of the upper retaining ring 41, and the second rollers 54, which are evenly distributed on both sides of the lower retaining ring 51, jointly press the outer wall of the tank body 7 and the end cap 6, achieving rapid centering and stable clamping of the workpiece. Finally, the buckle 56 on the lower retaining ring 51 and the hook 45 on the upper retaining ring 41 are locked together to ensure... The upper and lower retaining rings 51 are firmly connected and do not loosen during the welding process. While the upper and lower retaining rings 51 are engaged, the first connecting groove 44 inside the upper retaining ring 41 and the second connecting groove 52 inside the lower retaining ring 51 are precisely aligned and connected. The first air groove 43 on the inner wall of the upper retaining ring 41 and the second air groove 53 on the inner side of the lower retaining ring 51 form a closed annular protective air passage surrounding the annular seam between the tank body 7 and the end cap 6. The corrugated first sealing strip 46 fixed to the surface of the upper retaining ring 41 and the corrugated second sealing strip 55 fixed to the surface of the lower retaining ring 51 are tightly fitted against the outer wall of the tank body 7, forming a reliable sealed protective space. The bottom of the lower retaining ring 51 is slidably connected to the protruding structure on the top of the base 2 via a support foot 510. The third adjusting bolts 511 on both sides of the support foot 510 are connected to the protruding structure of the base 2. The slotted joint is slidably fitted, and externally locked by adjusting nut 512, which allows for fine adjustment and fixation of the lower retaining ring 51 position. Then, rotating the handle 31 of the exhaust mechanism 3 drives the first threaded rod 32 to rotate. The first threaded rod 32 is threadedly connected to the base 2, thereby pushing the slide groove 35 on the moving frame 33 to move horizontally along the base 2. The moving frame 33 simultaneously drives the top sealing block 37 to move forward, so that the sealing block 37 fits tightly with the opening of the end cover 6, achieving a reliable seal at the port of the tank 7. At the same time, the sealing block 37 drives the first bracket 310, the second bracket 38, and the internal connecting pipe 39 to extend into the end cover 6 and the tank 7. The first bracket 310 and the second bracket 38 are rotatably connected, and the connecting pipe 39 at the connection point is set with a corrugated structure to adapt to bending. Under the tension of the second spring 312, the second bracket 38 causes the end of the connecting pipe 39 to automatically tilt upwards and extend adaptively along the inner wall of the tank 7 to the top position of the tank 7. During the same process of the horizontal feeding of the moving frame 33, the guide block 34 at its bottom moves synchronously. The slope structure at the bottom of the guide block 34 cooperates with the slope structure of the support block 13 on the base 2 to push upwards, causing the base 2 to tilt upwards around the hinge end of the first connecting block 12 of the adjusting mechanism 1. The mounting plate 11 of the adjusting mechanism 1 is fixedly installed through the mounting holes at both ends. A first spring 15 is connected between the first connecting block 12 on the mounting plate 11 and the base 2. After the tilting action is completed, the first spring 15 remains in a taut state, and the tilting of the base 2 causes the tank 7 to simultaneously form a tilted posture.The inlet end of the connecting pipe 39 is precisely positioned at the highest point inside the tank 7. An external nitrogen source continuously fills the internal cavity of the tank 7 through the nitrogen pipe 58 on the lower retaining ring 51, the bellows pipe 59, and the inlet 36 inside the sealing block 37. Under gravity, the nitrogen slowly settles from top to bottom, driving the residual oxygen inside the tank 7 towards the highest point. Oxygen is drawn in through the groove at the raised end of the connecting pipe 39 and discharged outwards through the connecting pipe 39, achieving full replacement and complete evacuation of the air inside the tank 7. This ensures a stable nitrogen protective atmosphere on the inner wall of the weld throughout the entire process, preventing oxidation of the inner wall during high-temperature welding. Simultaneously, nitrogen enters the second gas groove 53 of the lower retaining ring 51 and flows into the first gas groove 43 of the upper retaining ring 41, finally exiting from the top opening of the first gas groove 43. This nitrogen then enters the welding area. A stable convection protective atmosphere is formed in the field, effectively isolating air and preventing oxidation of the molten pool and weld. The drive motor 91 of the drive mechanism 9 starts, and the transmission wheel 92 connected to the key at the output end drives the driven wheel 93 to rotate through the transmission belt. The driven wheel 93 drives the transmission gear 94 to rotate synchronously through the driven shaft 95. The transmission gear 94 and the driven gear 96 mesh with each other. The driven gear 96 drives the support wheel 98 to rotate at a constant speed through the support shaft 97. The support wheel 98 is made of rubber and is in close contact with the bottom surface of the tank body 7, thereby driving the tank body 7 to rotate slowly in a circumferential direction, so that the welding point is always kept at the top of the tank body 7. The molten pool naturally fills and flows downward under the action of gravity, so that the weld is fully formed and fused. This works in conjunction with the first roller 42, the second roller 54, and the third roller 55. The guiding and sealing function of the first sealing strip 46 and the second sealing strip 55 enables smooth and continuous circumferential welding of the tank body 7. In the drive mechanism 9, the adjusting block 911 can be driven to move horizontally along the fixed block 912 by rotating the adjusting screw 914. The top slope of the adjusting block 911 cooperates with the bottom slope of the lifting block 99, converting the horizontal displacement into the vertical lifting motion of the lifting block 99. The two second adjusting bolts 910 on one side of the lifting block 99 slide in contact with the slots inside the angle iron 913, providing vertical guidance for the lifting block 99 and limiting the lifting stroke through the end nuts. When the lifting block 99 lifts and lowers, it synchronously drives the support wheel 98 to move up and down, achieving precise adjustment of the contact height and clamping force between the support wheel 98 and the tank body 7, ensuring stable transmission and safe operation, and mitigating external high temperatures. The steam source is introduced into the second connecting groove 52 through the air inlet pipe 57 on the lower retaining ring 51. The steam circulates in the independent closed annular heating channel formed by the first connecting groove 44 and the second connecting groove 52, and is finally discharged through the return pipe 513, achieving uniform heating of the first gas groove 43 and the second gas groove 53. This heating channel is completely isolated from the welding area and the protective gas path, and the high-temperature steam will not come into direct contact with the weld and nitrogen, thus preventing water vapor from adversely affecting the welding quality. The high-temperature steam can preheat the nitrogen in the gas groove, avoiding the direct purging of the molten pool by low-temperature nitrogen, which would cause the molten pool to cool rapidly and result in poor formation. The rotation of the tank body 7 drives the weld to continuously pass through the heated first gas groove 43 and second gas groove 53 after welding, so that the weld can achieve uniform and slow cooling and effectively eliminate internal stress.To prevent weld seams from becoming brittle, cracking, or deforming due to sudden temperature drops, and to significantly improve the strength, airtightness, and structural reliability of the welded joint, after all circumferential welding is completed, the supply of nitrogen and high-temperature steam is stopped. The handle 31 is rotated in the opposite direction to reset the moving frame 33 along the slide groove 35. The base 2 returns to a horizontal position under the tension of the first spring 15. The connecting pipe 39 retracts synchronously with the second bracket 38. The latch 56 and hook 45 are unlocked, and the upper retaining ring 41 is rotated to open, allowing the welded liquid reservoir workpiece to be removed, thus completing the entire welding process.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A welding protection device for a liquid storage tank, characterized in that, An adjusting mechanism (1) is provided, with a base (2) connected to its top. The adjusting mechanism (1) is used to rotate the base (2) at an angle. A lower fixing mechanism (5) is installed at the other end of the base (2). The lower fixing mechanism (5) is connected to an upper fixing mechanism (4), and the upper fixing mechanism (4) is located directly above the lower fixing mechanism (5). The lower fixing mechanism (5) is used to cooperate with the upper fixing mechanism (4) to fix the end cap (6) and the tank body (7). An exhaust mechanism (3) is connected to one end of the base (2). The structure (3) is used for the internal exhaust of the tank (7). One end of the tank (7) is provided with a support frame (8). The bottom of the support frame (8) is fixedly connected to the base (2) by bolts. The surface of the support frame (8) is equipped with ball bearings to reduce friction with the outer wall of the tank (7). A drive mechanism (9) is provided between the lower fixing mechanism (5) and the support frame (8). The drive mechanism (9) is installed on the surface of the base (2) and contacts the outer wall of the tank (7). The drive mechanism (9) is used to drive the tank (7) to rotate.

2. The welding protection device for a liquid reservoir as described in claim 1, characterized in that: The adjustment mechanism (1) includes a mounting plate (11). The mounting plate (11) has mounting holes on both ends for fixing the mounting plate (11). The top of the mounting plate (11) has two first connecting blocks (12). The first connecting blocks (12) are fixedly connected to the mounting plate (11), and one side of the first connecting block (12) is connected to one bottom end of the first spring (15). One top end of the first spring (15) is connected to one side of the base (2). The other end of the mounting plate (11) is fixedly connected to the first connecting block (12) by screws. One top end of the first connecting block (12) is rotatably connected to the base (2). A support block (13) is installed in the middle of the top of the base (2). One end of the support block (13) has a sloping structure, and the top of the support block (13) is in contact with the bottom surface of the base (2).

3. The welding protection device for a liquid reservoir as described in claim 2, characterized in that: The exhaust mechanism (3) includes a movable frame (33), on both sides of the bottom of the movable frame (33) are provided with sliding grooves (35), the sliding grooves (35) slide in contact with the holes and grooves on the surface of the base (2), and a guide block (34) is provided at the bottom of the movable frame (33). The bottom of the guide block (34) has a sloping structure, and the guide block (34) slides in contact with the top surface of the support block (13). One side of the movable frame (33) is rotatably connected to one end of the first threaded rod (32), the first threaded rod (32) is threadedly connected to one end of the base (2), and a handle (31) is fixedly installed at one end of the first threaded rod (32). A sealing block (37) is fixedly installed on one side of the top of the movable frame (33), and an air inlet (36) is provided inside the sealing block (37).

4. The welding protection device for a liquid reservoir as described in claim 3, characterized in that: The sealing block (37) has a first bracket (310) inserted inside. One end of the first bracket (310) is fixedly connected to the inside of the sealing block (37), and the other end of the first bracket (310) is rotatably connected to the end of the second bracket (38). A connecting pipe (39) is fixedly installed inside both the first bracket (310) and the second bracket (38). The part of the connecting pipe (39) near the connection between the first bracket (310) and the second bracket (38) has a corrugated structure, and a hole groove is opened at the end of the connecting pipe (39). A third connecting block (311) is fixedly installed on both sides of the first bracket (310). The third connecting block (311) is fixedly connected to one end of the second spring (312), and the other end of the second spring (312) is fixedly connected to the second bracket (38).

5. The welding protection device for a liquid reservoir as described in claim 4, characterized in that: The upper fixing mechanism (4) includes an upper retaining ring (41), on both sides of the upper retaining ring (41) are first rollers (42), the first rollers (42) are distributed at equal intervals, the upper retaining ring (41) has an arc-shaped structure, and the inner wall of the upper retaining ring (41) is provided with a first air groove (43), the upper retaining ring (41) is provided with a first connecting groove (44), the two ends of the first connecting groove (44) are open, and a hook (45) is fixedly installed at one end of the upper retaining ring (41). A first sealing strip (46) is distributed on both sides of the first air groove (43), the first sealing strip (46) is fixedly connected to the surface of the upper retaining ring (41), the surface of the first sealing strip (46) has a corrugated structure, and the first sealing strip (46) is in contact with the surface of the tank (7).

6. The welding protection device for a liquid reservoir as described in claim 5, characterized in that: The lower fixing mechanism (5) includes a lower retaining ring (51), which has a second connecting groove (52) inside. The two ends of the second connecting groove (52) are open. A second air groove (53) is provided on the inner surface of the lower retaining ring (51). A buckle (56) is fixedly installed on one end of the upper retaining ring (41). The buckle (56) is connected to the hook (45). The other end of the lower retaining ring (51) is rotatably connected to the upper retaining ring (41). Second rollers (54) are installed on both sides of the lower retaining ring (51). The second rollers (54) are distributed in an arc shape with equal spacing. A second seal is fixedly installed on both sides of the lower retaining ring (51). The second sealing strip (55) has a corrugated surface and is attached to the surface of the tank (7). The second gas groove (53) on the surface of the lower retaining ring (51) is connected to the nitrogen pipe (58). The second connecting groove (52) inside the lower retaining ring (51) is connected to the air inlet pipe (57) and the air return pipe (513). The two ends of the second connecting groove (52) are not connected. The second connecting groove (52) is composed of two arc-shaped channels. The air inlet pipe (57) is connected to the external high-temperature steam source. The nitrogen pipe (58) is connected to one end of the bottom of the corrugated pipe (59). The top section of the corrugated pipe (59) is connected to one end of the connecting pipe (39).

7. The welding protection device for a liquid reservoir as described in claim 6, characterized in that: The lower retaining ring (51) is fixedly installed with support feet (510) on both sides of the bottom. The support feet (510) are slidably connected to the top protruding structure of the base (2). The support feet (510) are provided with third adjusting bolts (511) on both sides. The third adjusting bolts (511) are slidably contacted with the holes and grooves on the surface of the top protruding structure of the base (2). The third adjusting bolts (511) are externally threaded with adjusting nuts (512).

8. The welding protection device for a liquid reservoir as described in claim 7, characterized in that: The drive mechanism (9) includes a drive motor (91), which is mounted on the surface of the base (2). The output end of the drive motor (91) is key-connected to a transmission wheel (92). The transmission wheel (92) is connected to the driven wheel (93) via a transmission belt. The driven wheel (93) is connected to the transmission gear (94) via a driven shaft (95). The driven shaft (95) is rotatably connected to one side of the lifting block (99). The driven wheel (93) and the transmission gear (94) are both fixedly mounted on the outside of the driven shaft (95). The transmission gear (94) and the driven gear (96) mesh with each other. The driven gear (96) is connected to the support wheel (98) via a support shaft (97). One end of the support shaft (97) is rotatably connected to the lifting block (99). The support wheel (98) is in close contact with the bottom surface of the tank. The surface of the support wheel (98) is made of rubber.

9. The welding protection device for a liquid reservoir as described in claim 8, characterized in that: Two second adjusting bolts (910) are fixedly connected to one side of the lifting block (99). A nut is threaded to one end of the second adjusting bolt (910), and the second adjusting bolt (910) slides in contact with the internal slot of the angle iron (913). The angle iron (913) is fixedly connected to the base (2). The bottom of the lifting block (99) slides in contact with the top of the adjusting block (911). The top of the adjusting block (911) is sloping, and the contact surface between the bottom of the lifting block (99) and the adjusting block (911) is sloping. The bottom of the adjusting block (911) slides in contact with the fixing block (912). The fixing block (912) is fixedly installed on the surface of the base (2), and one end of the fixing block (912) is threaded to one end of the adjusting screw (914), and the adjusting screw (914) is threaded to one end of the adjusting block (911).

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