A labor-saving internal clamping and anti-deformation device and method

Abstract

The present invention discloses a labor-saving internal tightening and anti-deformation device and method. The device includes: a front tightening component, a middle force-relieving component, and a rear supporting component; the front tightening component is used to tighten and apply force to one side of the large vertical plate during the welding process of the large vertical plate to control anti-deformation; the middle force-relieving component is used to limit the front tightening component and the rear supporting component during the welding process of the large vertical plate, and is used to relieve the deformation resilience of the large vertical plate after welding; the rear supporting component is used to tighten the other side of the large vertical plate during the welding process of the large vertical plate; the present invention can achieve anti-deformation control of the large vertical plate, ensure the perpendicularity of the large vertical plate, and avoid post-welding straightening.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and particularly relates to a labor-saving internal jacking and anti-deformation device and method. Background Art

[0002] Due to the large difference in the inner and outer structures of the main structural parts of the excavator turntable, the welding amount on the inner side of the main vertical plate is significantly more than that on the outer side. After welding, the main vertical plate will tilt inward at a large angle, and it is difficult to ensure the perpendicularity with the main bottom plate of the body. When assembling the boom tail and the oil cylinder, a large bell mouth gap appears, and flame straightening or grinding treatment is required, which seriously affects the production efficiency.

[0003] Currently, the control method for the welding deformation of the main vertical plate of the excavator turntable is to use welding process tension bars. That is, when assembling the structural parts, a section of solid square steel is used to connect the left and right main vertical plates and the hinge holes of the boom tail into a whole to enhance the stiffness restraint of the main vertical plate and achieve the purpose of reducing welding deformation. The main disadvantages of this welded tension bar are as follows: 1. The process tension bar is a rigid restraint and cannot realize the control of the anti-deformation of the main vertical plate. After the tension bar is removed, the springback is large, and the deformation control effect is poor; 2. The installation and disassembly process of the tension bar involves welding, air gouging, and grinding operations, which are time-consuming and laborious; 3. Due to space limitations and surface quality requirements, the tension bar can only be welded to the top of the main vertical plate. The force application point is far from the bottom of the ear plate, and the force arm is long, so the restraint degree on the welding joint of the ear plate is low, and the deformation control effect is not good; 4. After the tension bar is used for a period of time, due to repeated welding and air gouging, the surface becomes uneven and there are many inclusions, and the weld connection strength cannot be guaranteed, resulting in frequent explosion phenomena, and the reliability of the tension bar is low. Summary of the Invention

[0004] The purpose of the present invention is to provide a labor-saving internal jacking and anti-deformation device and method. The device controls the jacking and anti-deformation of the main vertical plate through the front jacking component, the middle force-relieving component, and the tail support component, ensures the perpendicularity of the main vertical plate, and avoids post-welding straightening.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a labor-saving internal jacking and anti-deformation device, including: a front jacking component, a middle force-relieving component, and a tail support component;

[0007] The front jacking component is used to jack and apply force to one side of the main vertical plate during the welding process of the main vertical plate to control the anti-deformation;

[0008] The middle force-relieving component is used to limit the front jacking component and the tail support component during the welding process of the main vertical plate, and is used to relieve the deformation springback force of the main vertical plate after welding;

[0009] The tail support component is used to tightly hold the other large vertical plate during the welding process of the large vertical plate;

[0010] The large vertical plate is the large vertical plate in the main structural components of the excavator turntable.

[0011] Furthermore, the front pressing component includes a pressing head, a pressing head connecting body, a plain bearing, a tightening nut, a nut wrench, and a pressing flange;

[0012] The pressing head connecting body is located inside the pressing head, and the pressing head and the pressing head connecting body are movably connected through a stepped thread; the pressing head is used to tightly hold one side of the large vertical plate during the welding process of the large vertical plate, and when the large vertical plate undergoes reverse deformation, the pressing head rotates at a certain angle along with the large vertical plate, so that the end face of the pressing head is always in close contact with the surface of the large vertical plate;

[0013] One end of the pressing head connecting body is provided with a groove, one end of the pressing flange extends into the groove, and the pressing head connecting body and the front end of the pressing flange are movably connected through a stepped thread; the other end of the pressing flange is a pressing flange bolt;

[0014] The plain bearing and the tightening nut are sequentially sleeved on the stepped main shaft of the top pressing flange, and nut wrenches are provided at both ends of the tightening nut.

[0015] Furthermore, the middle force-relieving component includes a force-relieving flange, a limit bolt, a limit component, a pin, and a modified three-jaw chuck;

[0016] The force-relieving flange is threadedly connected to the pressing flange bolt, a rectangular shaft is provided at the center of the force-relieving flange, a rectangular slot hole is provided at the center of the modified three-jaw chuck, and the rectangular shaft of the force-relieving flange and the rectangular slot hole of the modified three-jaw chuck are in clearance fit, enabling the two to perform horizontal directional movement;

[0017] A through hole is opened on the end face of the force-relieving flange, a threaded hole is drilled on the inner end face of the modified three-jaw chuck, a limit bolt is arranged in the through hole, and the limit bolt is matched with the threaded hole;

[0018] The pin is hinged to the outer end of the jaw of the modified three-jaw chuck and moves radially along with the jaw;

[0019] Limit components are provided on the outer circumferential side surfaces of the force-relieving flange and the modified three-jaw chuck, and the limit components are symmetrically arranged before and after relative to the pin.

[0020] Furthermore, three limit bolts are evenly arranged circumferentially on the end face of the force-relieving flange;

[0021] 3 limit components are evenly arranged on the outer circumferential side surfaces of the force-relieving flange and the modified three-jaw chuck respectively.

[0022] Further, a return spring is sleeved on the limit bolt.

[0023] Further, a chuck wrench is provided on the outer circumferential side surface of the modified three-jaw chuck.

[0024] Further, the tail support component includes a flange plate, a long pipe and a backing plate;

[0025] The flange plate and the backing plate are respectively welded to both ends of the long pipe;

[0026] The front end of the flange plate is provided with flange bolts, and the tail support component is connected to the rear end of the modified three-jaw chuck of the middle force-relieving component through the flange bolts;

[0027] The backing plate is used to tightly press against the large vertical plate.

[0028] Further, the tail support component further includes a convenient handle, and the convenient handle is welded to the front end of the outer surface of the long pipe, close to one end of the flange plate.

[0029] Further, a rolling bearing is installed on the contact surface between the limit assembly of the middle force-relieving component and the pin.

[0030] Further, the pin of the middle force-relieving component is of a single-sided wedge structure.

[0031] The present invention also provides a method for performing tightening and anti-deformation by a labor-saving internal tightening and anti-deformation device, including:

[0032] Placing the device in the middle of the large vertical plate, rotating the chuck wrench to make the pin move radially to the surface of the modified three-jaw chuck to limit the force-relieving flange and the modified three-jaw chuck;

[0033] Making the backing plate closely adhere to the right large vertical plate, using a nut wrench to rotate and tighten the nut. The left part of the plain bearing and the pressure head and the pressure head connecting body are stationary relative to the large vertical plate. Initially, the front end of the tightening flange is located at the leftmost end of the groove of the pressure head connecting body. During the process of rotating and tightening the nut, the tightening flange moves to the right inside the pressure head connecting body, and the front tightening component and the tail support component apply forces to the two large vertical plates, causing the two large vertical plates to bend outwards to control the anti-deformation of the large vertical plate.

[0034] Further, the maximum anti-deformation amount of the large vertical plate is determined by the moving distance of the front end of the tightening flange inside the pressure head connecting body.

[0035] Further, the method further includes:

[0036] After the large vertical plate is welded, turn the chuck wrench. The jaws move radially outwards to push out the pin. The front tightening component and the tail support component lose their limits. Under the action of the resilience of the deformed large vertical plate, they move towards each other and compress the return spring. When the resilience of the deformation is completely released, turn and tighten the nut, remove the device, and the pressure relief flange and the modified three-jaw chuck automatically reset under the action of the return spring.

[0037] The beneficial effects of the present invention are as follows:

[0038] (1) Through the front tightening component, the middle pressure relief component and the tail support component, the present invention supports between the large vertical plates, can realize the control of the reverse deformation of the large vertical plate, ensure the perpendicularity of the large vertical plate, and avoid post-welding straightening.

[0039] (2) The front tightening component of the present invention has a relatively small frictional resistance during use, a long service life, and stable and reliable performance by arranging plane bearings.

[0040] (3) Most components of the present invention are connected by threads, and the clamping and disassembly are efficient, convenient, time-saving and labor-saving; the component structure fully considers the processing manufacturability, is convenient to manufacture, and has a low cost. Description of the Drawings

[0041] Figure 1 It is the front view of the labor-saving internal tightening and reverse deformation device provided by the embodiment of the present invention;

[0042] Figure 2 It is the three-dimensional view of the labor-saving internal tightening and reverse deformation device provided by the embodiment of the present invention;

[0043] Figure 3 It is the sectional view of the front tightening component provided by the embodiment of the present invention;

[0044] Figure 4 It is the sectional view of the middle pressure relief component provided by the embodiment of the present invention;

[0045] Figure 5 It is the sectional view of the tail support component provided by the embodiment of the present invention;

[0046] Figure 6 It is the schematic diagram of the reverse deformation application of the labor-saving internal tightening and reverse deformation device provided by the embodiment of the present invention;

[0047] Figure 7 It is the schematic diagram of the disassembly application of the labor-saving internal tightening and reverse deformation device provided by the embodiment of the present invention;

[0048] In the figure: 1 - Front part tightening component, 2 - Middle part force - releasing component, 3 - Tail part supporting component, 4 - Press head, 5 - Press head connecting body, 6 - Plain bearing, 7 - Tightening nut, 8 - Nut wrench, 9 - Tightening flange, 10 - Tightening flange bolt, 11 - Force - releasing flange, 12 - Limit bolt, 13 - Limit assembly, 14 - Rolling bearing, 15 - Return spring, 16 - Pin, 17 - Modified three - jaw chuck, 18 - Chuck wrench, 19 - Flange bolt, 20 - Flange, 21 - Long pipe, 22 - Convenient handle, 23 - Cushion plate. Detailed implementation mode

[0049] The present invention will be further described below. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0050] An embodiment of the present invention provides a labor - saving internal tightening and anti - deformation device. Refer to Figure 1 and Figure 2 , which includes a front part tightening component 1, a middle part force - releasing component 2 and a tail part supporting component 3.

[0051] The front part tightening component 1 is used to tighten and apply force to one side of the large vertical plate during the welding process of the large vertical plate to control anti - deformation.

[0052] The middle part force - releasing component 2 is used to limit the front part tightening component and the tail part supporting component during the welding process of the large vertical plate, and is used to release the deformation resilience of the large vertical plate after welding to facilitate the disassembly of the device;

[0053] The tail part supporting component 3 is used to tighten the other side of the large vertical plate during the welding process of the large vertical plate.

[0054] It should be noted that the large vertical plate is the large vertical plate in the main structural parts of the excavator turntable.

[0055] Specifically, refer to Figure 3 , the front part tightening component 1 includes a press head 4, a press head connecting body 5, a plain bearing 6, a tightening nut 7, a nut wrench 8 and a tightening flange 9.

[0056] The press head connecting body 5 is located inside the press head 4, and the press head 4 and the press head connecting body 5 are movably connected by step threads. The press head is a cylinder, and its end face fits with the surface of the large vertical plate. When the large vertical plate undergoes anti - deformation, the press head can rotate at a certain angle, and the end face always fits tightly with the surface of the large vertical plate to avoid causing indentations on the surface of the large vertical plate.

[0057] One end of the press head connecting body 5 is provided with a groove, one end of the tightening flange 9 extends into the groove, and the front end of the press head connecting body 5 and the tightening flange 9 are movably connected by step threads. The other end of the tightening flange 9 is a tightening flange bolt 10.

[0058] The plain bearing 6 and the tightening nut 7 are successively sleeved on the stepped main shaft of the top-tightening flange 9, and nut wrenches 8 are provided at both ends of the tightening nut 7. During use, by rotating the tightening nut 7 through the nut wrench 8, the left half of the plain bearing 6 remains stationary relative to the large vertical plate together with the pressure head 4 and the pressure head connecting body 5, and the right half rotates together with the tightening nut 7. The sliding friction between the pressure head 4 and the pressure head connecting body 5 is converted into rolling friction inside the plain bearing 6, greatly reducing the frictional resistance.

[0059] It should be noted that initially, the front end of the top-tightening flange 9 is located at the leftmost end of the groove of the pressure head connecting body 5. When the tightening nut 7 is rotated, the front end of the top-tightening flange gradually moves away from the left end of the groove of the pressure head connecting body 5 and moves to the right. At the same time, the two large vertical plates on both sides bend outwards. Based on this, the maximum anti-deformation amount of the front top-tightening component 1 is determined by the moving distance D of the front end of the top-tightening flange 9 inside the pressure head connecting body 5. The larger the value of D, the larger the maximum anti-deformation amount.

[0060] As Figure 4 shown, the middle force-relieving component 2 includes a force-relieving flange 11, a limit bolt 12, a limit assembly 13, a return spring 15, a pin 16, a modified three-jaw chuck 17 and a chuck wrench 18.

[0061] Specifically, the force-relieving flange 11 is threadedly connected to the top-tightening flange bolt 10. A rectangular shaft is designed at the center of the force-relieving flange 11, and a rectangular slot hole is provided at the center of the modified three-jaw chuck 17. The rectangular shaft of the force-relieving flange and the rectangular slot hole of the three-jaw chuck are in clearance fit, enabling the two to only perform horizontal directional movement.

[0062] A through hole is opened on the end face of the force-relieving flange 11, and a threaded hole is drilled on the inner end face of the modified three-jaw chuck 17. The limit bolt 12 is arranged in the through hole, and the limit bolt 12 is engaged with the threaded hole to movably connect the two, so as to limit their reverse movement distance.

[0063] Furthermore, in this embodiment, three limit bolts are evenly arranged in the circumferential direction on the end face of the force-relieving flange 11.

[0064] Furthermore, a return spring 15 is sleeved on the limit bolt 12 to realize the automatic reset of the force-relieving component.

[0065] The pin 16 is hinged to the outer end of the jaw of the modified three-jaw chuck 17 and can move radially along with the jaw.

[0066] Limit assemblies 13 are evenly distributed on the outer circumferential side surfaces of the force-relieving flange 11 and the modified three-jaw chuck 17, and the limit assemblies 13 are symmetrically distributed on both sides of the pin 16 before and after to limit the relative movement of the force-relieving flange 11 and the modified three-jaw chuck 17.

[0067] Furthermore, in this embodiment, 3 limit assemblies are evenly arranged on the outer circumferential side surfaces of the force-relieving flange 11 and the modified three-jaw chuck 17 respectively.

[0068] Furthermore, a chuck wrench 18 is provided on the outer circumferential side surface of the reformed three-jaw chuck 17.

[0069] Before welding, rotate the chuck wrench 18 to move the pin 16 radially to the surface of the three-jaw chuck to limit the force-relieving flange 11 and the reformed three-jaw chuck 17. After welding is completed, by rotating the chuck wrench 18, the three jaws move radially outwards to push out the pin 16, and the front pressing member 1 and the tail support member 3 lose their limits. Under the action of the reaction force of the deformation of the large vertical plate, they quickly move towards each other and compress the return spring 15. When the reaction force of the deformation is completely released, easily rotate and tighten the nut 7, and the device can be disassembled. At the same time, the force-relieving flange 11 and the reformed three-jaw chuck 17 are automatically reset under the action of the return spring, which is convenient for the next installation of the device.

[0070] As Figure 5 shown, the tail support member 3 includes a flange plate 20, a long pipe 21, a convenient handle 22 and a backing plate 23.

[0071] The flange plate 20 and the backing plate 23 are respectively welded to both ends of the long pipe 21.

[0072] The tail support member is connected to the rear end of the reformed three-jaw chuck 17 of the middle force-relieving member 2 through the flange plate 20 and the flange bolts 19 at the front end of the flange plate 20.

[0073] The backing plate 23 is used to directly press against the large vertical plate.

[0074] The convenient handle 22 is welded to the front end of the outer surface of the long pipe 21, close to the flange plate 20, to approach the centroid of the pressing device.

[0075] As a preferred embodiment, a rolling bearing 14 is installed on the contact surface between the limit component 13 of the middle force-relieving member and the pin 16, which can realize rolling friction instead of sliding friction, and effectively reduce the radial movement resistance of the pin 16.

[0076] As a preferred embodiment, the pin 16 of the middle force-relieving member is designed into a single-sided wedge structure, as Figure 4 shown, to avoid damage caused by the impact of the limit component 13 under the action of the rebound force of the deformation of the large vertical plate when the pin 16 is pulled out.

[0077] As a preferred embodiment, according to the actual maximum deformation amount of the large vertical plate, design the height difference of the wedge surface of the pin 16 of the middle force-relieving member, the length of the central rectangular shaft of the force-relieving flange 11, and the depth of the central rectangular slot of the reformed three-jaw chuck 17 to ensure that the rebound force of the deformation of the large vertical plate is completely released.

[0078] After the turntable body is assembled, place the device in the middle of the large vertical plate through the convenient handle 22. Rotate the chuck wrench 18 to move the pin 16 radially to the surface of the three-jaw chuck to limit the pressure relief flange 11 and the modified three-jaw chuck 17. Then, first make the backing plate 23 close to the right large vertical plate, and then use the nut wrench 8 to rotate and tighten the nut 7 to make the pressure head 4 close to the left large vertical plate. Continue to rotate and tighten the nut 7, and the two large vertical plates bend outwards to achieve reverse deformation of the large vertical plate, as Figure 6 shown.

[0079] After the large vertical plate is welded, rotate the chuck wrench 18, and the jaws move radially outwards to push out the pin 16. The front tightening component 1 and the tail support component 3 lose their limits. Under the action of the resilience of the deformed large vertical plate, they move towards each other rapidly and compress the return spring 15. When the resilience of the deformation is completely released, easily rotate and tighten the nut 7, and the device can be removed. At the same time, the pressure relief flange 11 and the modified three-jaw chuck 17 are automatically reset under the action of the return spring, which is convenient for the next installation, as Figure 7 shown.

[0080] For the labor-saving internal tightening and reverse deformation device provided in this embodiment, the front tightening component converts the sliding friction of the pressure head assembly into rolling friction through the layout of plain bearings, greatly reducing the reverse deformation friction resistance. The middle pressure relief component relies on the modified three-jaw chuck and realizes the rapid release of the resilience of the large vertical plate through three groups of circumferentially arranged rolling contact limit components and pins, basically eliminating the disassembly friction resistance; at the same time, through three groups of circumferentially arranged limit bolts and return springs, the pressure relief component has a self-locking function, realizing the rapid clamping of the device. The overall structure of the device in this embodiment is in the shape of a pin shaft, which can tighten the large vertical plate at any position on the inner surface of the large vertical plate, greatly shortening the acting force arm, having stronger restraint, better deformation control effect, and most components are connected by threads, which is convenient for disassembly and replacement; the component structure fully considers the processing manufacturability, is easy to manufacture, and has low cost.

[0081] It should be noted that for the front tightening component, when the required reverse deformation amount of the large vertical plate is small or the welding shrinkage force is small, the combination scheme of the pressure head and the pressure head connecting body can be cancelled, and the pressure head connecting body can be directly used as the pressure head, so as to reduce the manufacturing cost to a certain extent.

[0082] It should be noted that when there are many product models, one end of the long tube of the tail support component can be processed with a left-handed internal thread, and the backing plate is changed to a left-handed bolt. In this way, the overall length of the component can be changed by adjusting the protruding length of the left-handed bolt, making the device have strong versatility.

[0083] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A labor-saving internal tightening and anti-deformation device, characterized in that, Comprising: A front pressing component, a middle force-relieving component, and a tail supporting component; The front pressing component is used to press and apply force to one side of the large vertical plate during the welding process of the large vertical plate to control anti-deformation; the front pressing component includes a pressure head, a pressure head connecting body, a plain bearing, a tightening nut, a nut wrench, and a pressing flange; The pressure head connecting body is located inside the pressure head, and the pressure head and the pressure head connecting body are movably connected by a stepped thread; the pressure head is used to press one side of the large vertical plate during the welding process of the large vertical plate, and when the large vertical plate undergoes anti-deformation, the pressure head rotates at a certain angle along with the large vertical plate, so that the end face of the pressure head is always in close contact with the surface of the large vertical plate; One end of the pressure head connecting body is provided with a groove, one end of the pressing flange extends into the groove, and the pressure head connecting body and the front end of the pressing flange are movably connected by a stepped thread; the other end of the pressing flange is a pressing flange bolt; The plain bearing and the tightening nut are sequentially sleeved on the stepped main shaft of the pressing flange, and nut wrenches are provided at both ends of the tightening nut; The middle force-relieving component is used to limit the front pressing component and the tail supporting component during the welding process of the large vertical plate, and is used to relieve the deformation resilience of the large vertical plate after welding; the middle force-relieving component includes a force-relieving flange, a limit bolt, a limit component, a pin, and a modified three-jaw chuck; The force-relieving flange is threadedly connected with the pressing flange bolt, a rectangular shaft is provided at the center of the force-relieving flange, a rectangular slot hole is provided at the center of the modified three-jaw chuck, and the rectangular shaft of the force-relieving flange and the rectangular slot hole of the modified three-jaw chuck are in clearance fit to enable the two to perform horizontal directional movement; A through hole is opened on the end face of the force-relieving flange, a threaded hole is drilled on the inner end face of the modified three-jaw chuck, a limit bolt is arranged in the through hole, and the limit bolt is matched with the threaded hole; The pin is hinged to the outer end of the jaw of the modified three-jaw chuck and moves radially along with the jaw; Limit components are provided on the outer circumferential side surfaces of the force-relieving flange and the modified three-jaw chuck, and the limit components are symmetrically arranged before and after relative to the pin; The tail supporting component is used to press the other side of the large vertical plate during the welding process of the large vertical plate; the tail supporting component includes a flange plate, a long pipe, and a backing plate; The flange plate and the backing plate are respectively welded to both ends of the long pipe; A flange plate bolt is provided at the front end of the flange plate, and the tail supporting component is connected to the rear end of the modified three-jaw chuck of the middle force-relieving component through the flange plate bolt; The backing plate is used to press the large vertical plate; The large vertical plate is the large vertical plate in the main structural member of the excavator turntable.

2. The labor-saving internal tightening and anti-deformation device according to claim 1, characterized in that, Three limit bolts are evenly arranged circumferentially on the end face of the force-relieving flange; Three limit components are evenly arranged on the outer circumferential side surfaces of the force-relieving flange and the modified three-jaw chuck respectively.

3. The labor-saving internal tightening and anti-deformation device according to claim 2, characterized in that, A return spring is sleeved on the limit bolt.

4. The labor-saving internal tightening and anti-deformation device according to claim 1, characterized in that, A chuck wrench is provided on the outer circumferential side surface of the modified three-jaw chuck.

5. The labor-saving internal tightening and anti-deformation device according to claim 1, characterized in that, The tail supporting component further includes a convenient handle, and the convenient handle is welded to the front end of the outer surface of the long pipe, close to one end of the flange plate.

6. The labor-saving internal tightening and anti-deformation device according to claim 1, characterized in that, A rolling bearing is installed on the contact surface between the limit component of the middle force-relieving component and the pin.

7. The labor-saving internal tightening and anti-deformation device according to claim 1, characterized in that, The pin of the middle force-relieving component is a single-sided wedge structure.

8. A method for tightening and anti-deforming based on the labor-saving internal tightening and anti-deformation device according to claim 3, characterized in that, Comprising: Place the said device in the middle of the large vertical plate, and rotate the chuck wrench to make the pin move radially to the surface of the modified three-jaw chuck to limit the pressure relief flange and the modified three-jaw chuck; the chuck wrench is arranged on the outer circumferential side surface of the modified three-jaw chuck; Make the backing plate close to the right large vertical plate, and use a nut wrench to rotate and tighten the nut. The left part of the plain bearing, the pressure head and the pressure head connecting body are stationary relative to the large vertical plate. Initially, the front end of the tightening flange is located at the leftmost end of the groove of the pressure head connecting body. During the process of rotating and tightening the nut, the tightening flange moves to the right inside the pressure head connecting body, and the front tightening component and the tail support component apply force to the two large vertical plates, causing the two large vertical plates to bend outwards to control the reverse deformation of the large vertical plate.

9. The method for tightening and anti-deforming according to claim 8, characterized in that, The maximum reverse deformation amount of the large vertical plate is determined by the moving distance of the front end of the tightening flange inside the pressure head connecting body.

10. The method for performing tightening and anti-deformation according to claim 8, characterized in that, The said method further includes: After the large vertical plate is welded, rotate the chuck wrench, the jaws move radially outwards to push out the pin, the front tightening component and the tail support component lose their limits, and move towards each other under the action of the reverse elastic force of the large vertical plate deformation, and compress the return spring. When the reverse elastic force of the deformation is completely released, rotate and tighten the nut, remove the device, and the pressure relief flange and the modified three-jaw chuck automatically reset under the action of the return spring.

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