Welding method of cylindrical shell

Abstract

The present invention relates to the field of shell welding technology, and specifically to a method for welding a cylindrical shell. The present invention prefabricates a welding box, and uses the welding box to carry an operator. When the operator stands in the welding box to weld the cylindrical shell, the welding box shields the weld position from wind. At the same time, a movable rod that can move back and forth on a bracket is provided, and the movable rod drives the travel wheel to move, and the distance between the travel wheel and the first bearing can be adjusted so that the travel wheel and the outer ring of the first bearing clamp the cylindrical shell. When one weld is completed, the travel wheel is driven to rotate by a motor, and the friction between the tire surface of the travel wheel and the inner wall of the cylindrical shell allows the travel wheel to move circumferentially on the inner wall of the cylindrical shell, thereby driving the welding basket to move circumferentially on the outer wall of the cylindrical shell to the outside of the next weld position, thereby quickly adjusting the position of the welding box, greatly improving construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of shell welding, in particular to a welding method for a columnar shell. Background Art

[0002] In the metallurgical construction industry, the shells of blast furnaces, hot blast furnaces, dry quenching furnaces, etc. are all columnar structures, and are often pressed into corresponding curved surfaces from large-area plates, and then assembled and welded into shape. This type of equipment is difficult to transport by road due to its large structural dimensions, so it cannot be manufactured in a factory. In the actual construction process, on-site production and field assembly and welding are often used for construction. During field welding operations, encountering strong winds, pores are prone to form in the welds, affecting the welding quality. The traditional windproof method is to use a cover to block the upwind vent. This method requires frequent movement of the cover as the welding position changes, which is cumbersome to operate and greatly reduces construction efficiency. At the same time, in environments with changing wind directions, the traditional windproof method has poor windproof effect, resulting in the inability to effectively control the welding quality. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the traditional windbreak method has the problems of cumbersome operation and low construction efficiency.

[0004] In order to solve the above problem, the present invention provides a columnar shell welding method for a windshield device capable of quickly adjusting the welding position. The specific solution is:

[0005] A method for welding a cylindrical shell comprises the following steps:

[0006] Step 1: Divide the cylindrical shell into multiple curved surfaces according to construction requirements, and make curved surface plates according to the curved surface size and the thickness of the cylindrical shell;

[0007] Step 2: At the construction site, multiple curved panels are assembled into a cylindrical shell and temporarily fixed;

[0008] Step 3: Pre-fabricate a rectangular welding box, open the front side of the welding box, and rotatably set first bearings on both sides of the top of the welding box. The first bearings are parallel to the axis of the cylindrical shell. A bracket is fixed at the front end of the top of the welding box. Two parallel movable grooves are opened at both ends of the bottom of the bracket. Threaded rods are rotatably set in the two movable grooves. Vertical movable rods are respectively threadedly sleeved on the two threaded rods. A motor is fixed between the two movable rods. The bottom ends of the two movable rods are rotatably connected to the rotating rods through the second bearings. The output shaft of the motor is connected to the rotating rod for transmission. A walking wheel is fixed on the bottom of the rotating rod. The walking wheel is parallel to the axis of the cylindrical shell. A lifting lug is fixed on the top of the welding box.

[0009] Step 4: The operator enters the welding box and hoist it to the outside of the curved plate at the weld position using the lifting lugs. The bracket between the running wheels and the welding box is placed on top of the curved plate above the weld. At this point, the two running wheels are located on the inside of the curved plate.

[0010] Step 5: Synchronously rotate the two threaded rods to drive the two moving rods toward the inner wall of the curved plate until the travel wheel abuts against the inner wall of the curved plate. At this time, the outer ring of the second bearing abuts against the outer wall of the curved plate. The front end of the welding box is close to the outer wall of the curved plate to protect the weld from wind.

[0011] Step 6: Start welding the weld until the weld is completed;

[0012] Step 7: Turn on the motor and drive the travel wheel to rotate through the output shaft of the motor. The travel wheel moves circumferentially on the inner wall of the curved plate until it drives the welding box to move to the outer side of the curved plate at the next weld position and welds the weld;

[0013] Step 8. Repeat the steps in step 7 until all welds are completed.

[0014] Compared with the prior art, the present invention adopting the above technical solution has the following beneficial effects:

[0015] The present invention prefabricates a welding box and carries an operator through the welding box. When the operator stands in the welding box to weld the columnar shell, the welding box shields the weld position from wind. At the same time, a movable rod that can move back and forth on the bracket is provided. The movable rod drives the walking wheel to move, and the distance between the walking wheel and the first bearing can be adjusted so that the walking wheel and the outer ring of the first bearing clamp the columnar shell. When one weld is completed, the walking wheel is driven to rotate by a motor. The friction between the tire surface of the walking wheel and the inner wall of the columnar shell enables the walking wheel to move circumferentially on the inner wall of the columnar shell, thereby driving the welding basket to move circumferentially on the outer wall of the columnar shell to the outside of the next weld position, so that the position of the welding box can be quickly adjusted, thereby greatly improving construction efficiency.

[0016] Preferably, a further technical solution of the present invention is:

[0017] A first gear is fixedly mounted on the output shaft of the motor, and a second gear is fixedly mounted on each of the two rotating rods. The first gear and the two second gears are meshed and driven. When the motor is turned on, the first gear drives the two second gears to rotate. This structure allows the motor to simultaneously drive the two rotating rods to rotate, thereby driving the two running wheels to rotate simultaneously.

[0018] A third bearing is fixedly mounted on the front bottom of the welding box. When the outer ring of the second bearing abuts the outer wall of the curved plate, the outer ring of the third bearing also abuts the outer wall of the curved plate. The addition of the third bearing increases the stability of the welding box during movement.

[0019] The front end of the threaded rod protrudes from the bracket, and a knob is fixed on the threaded rod outside the bracket. In step 5, the threaded rod is driven to rotate by the knob. The threaded rod is driven to rotate by the knob, which is convenient for operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the welding state of an embodiment of the present application;

[0021] Figure 2 This is a structural stereogram in step three of the embodiment of the present application;

[0022] Figure 3 This is a three-dimensional diagram of the structure from another perspective in step three of the embodiment of the present application;

[0023] Figure 4 This is a side view of the structure in step three of the embodiment of the present application;

[0024] In the figure: 1. Columnar shell; 2. Bracket; 21. Moving groove; 211. Knob; 22. Threaded rod; 23. Moving rod; 231. Fixed plate; 24. Second bearing; 25. Rotating rod; 26. Second gear; 27. Travel wheel; 28. Motor; 29. ​​First gear; 3. Welding box; 31. Lifting eye; 32. First fixing rod; 33. First bearing; 34. Second fixing rod; 35. Third bearing. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0026] See attached Figure 1-4 , an embodiment of the present invention discloses a welding method for a cylindrical shell, comprising the following steps:

[0027] Step 1: According to the construction requirements, the cylindrical shell 1 is divided into multiple curved surfaces, and curved surface plates are manufactured according to the curved surface size and the thickness of the cylindrical shell 1;

[0028] Step 2: At the construction site, multiple curved panels are assembled into a cylindrical shell 1 and temporarily fixed;

[0029] Step 3: Pre-make a rectangular welding box 3, open the front side of the welding box 3, and close the other sides of the welding box 3. Fix the vertical first fixing rods 32 at both ends of the top of the welding box 3. The lower end of the first fixing rod 32 is fixed with a first bearing 33. The first bearing 33 is parallel to the axis of the columnar shell 1. Specifically, the inner ring of the first bearing 33 is fixedly sleeved at the lower end of the first fixing rod 32. Fix the bracket 2 at the front end of the top of the welding box 3, and open two parallel moving grooves 21 at both ends of the bottom of the bracket 2. The two moving grooves 21, a threaded rod 22 is rotatably provided so that the rear end of the threaded rod 22 is rotatably connected to the rear end of the movable groove 21. A vertical movable rod 23 is respectively threadedly sleeved on the two threaded rods 22. A motor 28 is fixed between the two movable rods 23. A rotating rod 25 is rotatably connected to the lower ends of the two movable rods 23 through second bearings 24. The output shaft of the motor 28 is transmission-connected to the rotating rod 25. Travel wheels 27 are fixedly sleeved on the bottom of the two rotating rods 25. The travel wheels 27 are axially parallel to the cylindrical shell 1. A lifting lug 31 is fixed on the top of the welding box 3.

[0030] Step 4: The operator enters the welding box 3 and hoist the welding box 3 to the outside of the curved plate at the weld position using the lifting lugs 31, so that the bracket 2 between the running wheels 27 and the welding box 3 rests on the top of the curved plate above the weld. At this time, the two running wheels 27 are located on the inside of the curved plate.

[0031] Step 5: Synchronously rotate the two threaded rods 22 to drive the two moving rods 23 toward the inner wall of the curved plate until the walking wheel 27 abuts against the inner wall of the curved plate. At this time, the outer ring of the second bearing 24 abuts against the outer wall of the curved plate. The front end of the welding box 3 is close to the outer wall of the curved plate to protect the welding position from wind.

[0032] Step 6: Start welding the weld until the weld is completed;

[0033] Step 7: Turn on the motor 28 and drive the travel wheel 27 to rotate through the output shaft of the motor 28. The travel wheel 27 moves circumferentially on the inner wall of the curved plate until it drives the welding box 3 to move to the outer side of the curved plate at the next weld position and weld the weld.

[0034] Step 8. Repeat the steps in step 7 until all welds are completed.

[0035] In this embodiment, the lower end of the moving rod 23 is coaxially fixed to the outer ring of the second bearing 24 , and the inner ring of the second bearing 24 is fixedly sleeved on the top end of the rotating rod 25 .

[0036] In this embodiment, a fixed plate is fixedly connected between the two moving rods 23, and a motor 28 is fixed to the bottom of the fixed plate. A first gear 29 is fixedly sleeved on the output shaft of the motor 28, and a second gear 26 is fixedly sleeved on each of the two rotating rods 25. The first gear 29 and the two second gears 26 are meshed and driven. Preferably, a protruding block is fixed to the front end of the fixed plate, and the motor 28 is fixed to the bottom of the protruding block, so that the motor 28 is located in the middle of the front of the two moving rods 23, and the diameter of the first gear 29 is larger than the diameter of the two second gears 26. This structure facilitates the motor 28 to simultaneously drive the two rotating rods 25 to rotate, thereby driving the two running wheels 27 to rotate simultaneously.

[0037] In this embodiment, a third bearing 35 is fixedly sleeved on the front side of the bottom of the welding box 3. Specifically, second fixing rods 34 are fixed at both ends of the front bottom of the welding box 3. The inner ring of the third bearing 35 is fixedly sleeved on the lower end of the second fixing rod 34. The outer ring of the third bearing 35 is used to abut the outer wall of the cylindrical housing 1. The front outer walls of the second bearing 24 and the third bearing 35 are on the same vertical plane, and the distance between the front outer walls of the second bearing 24 and the third bearing 35 and the front side of the welding box 3 is no more than 200 mm. When the outer ring of the second bearing 24 abuts the outer wall of the cylindrical housing 1, the outer ring of the third bearing 35 also abuts the outer wall of the cylindrical housing 1. At this time, the distance between the front side of the welding box 3 and the outer wall of the cylindrical housing 1 is no more than 200 mm, allowing the welding box 3 to effectively shield the weld location from wind. The addition of the third bearing 35 increases the stability of the welding box 3 during overall movement.

[0038] In this embodiment, the front end of the threaded rod 22 protrudes from the bracket 2, and a knob is fixed on the threaded rod 22 outside the bracket 2. In step 5, the threaded rod 22 is rotated by the knob. The threaded rod 22 is rotated by the knob, which is convenient for operation.

[0039] The present invention prefabricates a welding box 3 and carries an operator through the welding box 3. When the operator stands in the welding box 3 to weld the cylindrical shell 1, the welding box 3 shields the weld position from wind. At the same time, a movable rod 23 that can move back and forth on the bracket 2 is also provided. The movable rod 23 drives the walking wheel 27 to move, and the distance between the walking wheel 27 and the first bearing 33 can be adjusted so that the outer ring of the walking wheel 27 and the first bearing 33 clamps the cylindrical shell 1. When one weld is completed, the walking wheel 27 is driven to rotate by the motor 28. The friction between the tire surface of the walking wheel 27 and the inner wall of the cylindrical shell 1 allows the walking wheel 27 to move circumferentially on the inner wall of the cylindrical shell 1, thereby driving the welding basket to move circumferentially on the outer wall of the cylindrical shell 1 to the outside of the next weld position, and then the position of the welding box 3 can be quickly adjusted, greatly improving wind protection and construction efficiency.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of the present invention.

Claims

1. A welding method for a cylindrical shell, characterized in that: The following steps are involved: Step 1: Divide the cylindrical shell into multiple curved surfaces according to construction requirements, and make curved surface plates according to the curved surface size and the thickness of the cylindrical shell; Step 2: At the construction site, multiple curved panels are assembled into a cylindrical shell and temporarily fixed; Step 3: Pre-fabricate a rectangular welding box, open the front side of the welding box, and rotatably set first bearings on both sides of the top of the welding box. The first bearings are parallel to the axis of the cylindrical shell. A bracket is fixed at the front end of the top of the welding box. Two parallel movable grooves are opened at both ends of the bottom of the bracket. Threaded rods are rotatably set in the two movable grooves. Vertical movable rods are respectively threadedly sleeved on the two threaded rods. A motor is fixed between the two movable rods. The bottom ends of the two movable rods are rotatably connected to the rotating rods through the second bearings. The output shaft of the motor is connected to the rotating rod for transmission. A walking wheel is fixed on the bottom of the rotating rod. The walking wheel is parallel to the axis of the cylindrical shell. A lifting lug is fixed on the top of the welding box. Step 4: The operator enters the welding box and hoist it to the outside of the curved plate at the weld position using the lifting lugs. The bracket between the running wheels and the welding box is placed on top of the curved plate above the weld. At this point, the two running wheels are located on the inside of the curved plate. Step 5: Synchronously rotate the two threaded rods to drive the two moving rods toward the inner wall of the curved plate until the travel wheel abuts against the inner wall of the curved plate. At this time, the outer ring of the second bearing abuts against the outer wall of the curved plate. The front end of the welding box is close to the outer wall of the curved plate to protect the weld from wind. Step 6: Start welding the weld until the weld is completed; Step 7: Turn on the motor and drive the travel wheel to rotate through the output shaft of the motor. The travel wheel moves circumferentially on the inner wall of the curved plate until it drives the welding box to move to the outer side of the curved plate at the next weld position and welds the weld; Step 8. Repeat the steps in step 7 until all welds are completed.

2. The welding method of a cylindrical shell according to claim 1, characterized in that: A first gear is fixedly sleeved on the output shaft of the motor, and second gears are fixedly sleeved on the two rotating rods respectively. The first gear and the two second gears are engaged for transmission. When the motor is turned on, the first gear drives the two second gears to rotate.

3. The welding method of a cylindrical shell according to claim 1, characterized in that: The front side of the bottom of the welding box is also fixedly sleeved with a third bearing. When the outer ring of the second bearing abuts against the outer wall of the curved plate, the outer ring of the third bearing also abuts against the outer wall of the curved plate simultaneously.

4. The welding method of a cylindrical shell according to claim 1, wherein: The front end of the threaded rod protrudes from the bracket, and a knob is fixed on the threaded rod outside the bracket. In step five, the threaded rod is driven to rotate by the knob.

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