A pyrotechnic method using pyrotechnic tools

Abstract

This invention provides a pyrotechnic fixture and method for constructing nested thickened plates for large roll-on / roll-off (Ro-Ro) ships. The pyrotechnic fixture includes a platform plate and multiple slotted columns fixed to the outer edge of the platform plate. Slots are formed on the upper part of each slotted column to accommodate the ends of the square steel tubes of the clamping assembly. In use, the thickened plate to be pyrotechnically corrected is placed on the platform plate, with a pad laid on its upper surface. A jack is vertically positioned between the pad and the square steel tubes to provide downward pressure to the thickened plate, correcting its deformation. Then, pyrotechnic heating is performed according to a specific procedure to release internal stress and correct the deformation, thereby ensuring the flatness of the thickened plate. This pyrotechnic method effectively controls the construction accuracy of nested thickened plates, effectively correcting them to within the allowable accuracy range, ensuring high-precision construction of nested thickened plates, reducing the amount of pyrotechnic work and rework, lowering construction difficulty, and reducing labor costs.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a pyrotechnic tooling and pyrotechnic method for a nested thickened plate of a large roll-on / roll-off ship. Background Technology

[0002] In the existing technology, there is a lack of a heat treatment method for nested thickened plates in large roll-on / roll-off ships. During the welding of two nested thickened plates, residual stress can cause deformation, especially in the area near the weld. Therefore, heat treatment is necessary for correction. Existing technologies generally use hydraulic presses for local correction or heat treatment on a perforated steel platform. Steel platform heat treatment includes the following steps: 1. Placing the nested thickened plates on a perforated steel platform; 2. Fixing the free edges with braces and then heat-treating the thickened plates.

[0003] As mentioned above, the existing technology lacks a fire-forming method for nested thickened plates. The iron bar cannot constrain the thickened plate to a flat surface. The small contact area between the iron bar and the thickened plate leads to local abrupt changes. The thickened plate cannot be fire-formed to meet the precision requirements. The hydraulic press has low straightening efficiency and occupies a long time. The on-site construction volume is large, there is a lot of on-site rework, and the labor cost is high.

[0004] Designing a pyrotechnic method for nested thickened plates in large roll-on / roll-off ships to ensure accuracy and installation quality while reducing labor costs is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the present invention provides a pyrotechnic tooling for a nested thickened plate of a large roll-on / roll-off ship. The pyrotechnic tooling includes a platform plate, and a slotted column is fixed in the middle of each outer edge of the platform plate. The slotted column includes a first side plate and a second side plate that are vertically arranged and parallel to each other. A horizontally arranged column base plate and a column support plate are sandwiched between the first side plate and the second side plate. The column support plate is arranged parallel to the top of the column base plate. A column reinforcing plate is connected to the outer edge of the first side plate and the second side plate away from the center of the frame plate. The column reinforcing plate and the column support plate are vertically connected to form a slot.

[0006] The pyrotechnic tooling also includes a clamping assembly, which comprises a square steel pipe. The square steel pipe includes a first square steel pipe, a second square steel pipe, and a third square steel pipe located on the same plane. The second square steel pipe and the third square steel pipe are symmetrically arranged on both sides of the first square steel pipe and are both vertically connected to the middle of the first square steel pipe. The outer end of the square steel pipe is used to be inserted into the slot of the slot column. The column limiting strip located above the column support plate passes through the first side plate and the second side plate, thereby limiting the upper part of the square steel pipe.

[0007] The platform plate is used to place the thickened plate to be straightened by fire. The upper surface of the thickened plate is covered with a pad, which is located below each square steel pipe. The jack is vertically placed between the pad and each square steel pipe to provide downward pressure to the thickened plate and achieve the correction of the deformation of the thickened plate.

[0008] Optionally, the platform plate is square with a hollow center.

[0009] Optionally, the clamping assembly further includes a steel pipe reinforcing plate; the steel pipe reinforcing plate spans over the first steel pipe and connects the second and third steel pipes, and the steel pipe reinforcing plate is provided with lifting holes.

[0010] Optionally, the thickened plate includes a first thickened plate and a second thickened plate nested and welded together. The first thickened plate is sleeved around the periphery of the second thickened plate. The first thickened plate and the second thickened plate are flush on one side, and a weld is formed at the connection between the first thickened plate and the second thickened plate.

[0011] Optionally, it also includes a welding torch, a pry bar, and a rubber hammer. The welding torch is used to heat the thickened plate to release its internal stress, thereby achieving flame straightening to ensure the flatness of the entire thickened plate. The rubber hammer is used to hammer near the heated area to promote stress release. The pry bar is used to assist in adjusting the position of the thickened plate on the platform plate.

[0012] The present invention also provides a pyrotechnic method for the aforementioned pyrotechnic tooling, comprising the following steps:

[0013] S1. Lifting the thickened plate: Using a crane, the thickened plate is lifted onto the platform plate; the thickened plate includes a first thickened plate and a second thickened plate that are nested and welded together, with the first thickened plate fitted around the periphery of the second thickened plate;

[0014] S2. Press the thickened plate, hoist the pressing assembly, and hoist the pressing assembly to the top of the slot column, ensuring that the four ends of the pressing assembly correspond to the four slot columns respectively; place the pressing assembly in the slot of the slot column and insert the column limit strip;

[0015] S3. Back-heating is performed on both sides of the weld seam of the first and second thickened plates to release stress and form multiple heating trajectory lines. During the process, the first thickened plate is heated first. The first thickened plate includes four frames. The first frame is symmetrical with the second frame, and the third frame is symmetrical with the fourth frame. Each frame forms two heating trajectory lines along the length of the frame from the center point to both sides. The first, second, third, and fourth frames are heated in sequence to form a total of 8 heating trajectory lines. Then the second thickened plate is heated. The 8 heating trajectory lines of the second thickened plate are symmetrically distributed with the 8 heating trajectory lines of the first thickened plate about the weld seam. During the process, a rubber hammer is used to hammer the perimeter of the heated plate to release residual stress.

[0016] Optionally, in step S3, the heating trajectory line is parallel to the weld, and the center of the heating trajectory line is 8-15mm away from the edge of the weld.

[0017] Optionally, the following steps may also be included:

[0018] S4. Release the stress at the four corners of the first thickened plate with water and fire. The fire process is carried out in sequence to form four heating trajectory lines. The heating direction is from the inside to the outside. The first, second, third and fourth heating trajectory lines are carried out in sequence. The second and fourth heating trajectory lines are located at the diagonal of the first and third heating trajectory lines, respectively. During the process, a rubber hammer is used to hammer the perimeter of the fire process.

[0019] Optionally, the following steps may also be included:

[0020] S5. The four edges of the first thickened plate are heated by water and fire to release stress. The heating direction is from the inside to the outside, and the heating trajectory line is perpendicular to the length direction of the edge. Each edge forms two symmetrical heating trajectory lines. The first, second, third and fourth edges are heated in sequence. The horizontal distance between the heating trajectory line and the highest point of the protrusion of the first thickened plate is 50-70mm. During the process, a rubber hammer is used to hammer the perimeter of the heated area.

[0021] Optionally, the following steps may also be included:

[0022] S6. After rechecking the accuracy data and removing the jack, measure the flatness of the first thickened plate. The flatness should be 0-3mm. If the accuracy requirements are not met in some areas, perform local water-fire treatment. The horizontal distance between the heating trajectory line and the highest point of the protrusion of the first thickened plate should be 50-70mm. During the process, use a rubber hammer to hammer the area around the fire treatment.

[0023] As described above, the present invention provides a pyrotechnic fixture and method for a nested thickened plate of a large roll-on / roll-off ship. The pyrotechnic fixture includes a platform plate and multiple slotted columns fixed to the outer edge of the platform plate. Slots are formed on the upper part of the slotted columns to accommodate the ends of the square steel pipes of the clamping assembly. In use, the thickened plate to be pyrotechnically corrected is placed on the platform plate, and a pad is laid on the upper surface of the thickened plate. A jack is vertically positioned between the pad and the square steel pipes to provide downward pressure to the thickened plate, thereby correcting the deformation of the thickened plate. Then, pyrotechnic heating is performed according to a specific procedure to release internal stress and correct the deformation, thus ensuring the flatness of the thickened plate.

[0024] This pyrotechnic method can effectively control the construction accuracy of nested thickened plates, effectively correcting the thickened plates to the allowable accuracy range. The pyrotechnic process constraint method and the new pyrotechnic method adopted ensure the high-precision construction of nested thickened plates, reduce the amount of pyrotechnic work and rework, reduce construction difficulty, and reduce labor costs. Attached Figure Description

[0025] Figure 1 The diagram shown is a schematic representation of the overall structure of the pyrotechnic tooling in Embodiment 1 of the present invention.

[0026] Figure 2 The diagram shows the structure of the platform plate and the slot column in Embodiment 1 of the present invention.

[0027] Figure 3 The diagram shows a thickened plate placed on a platform plate in Embodiment 1 of the present invention.

[0028] Figure 4 The diagram shown is a three-dimensional structural schematic of the clamping component in Embodiment 1 of the present invention.

[0029] Figure 5 The diagram shown is a side view of the clamping assembly in Embodiment 1 of the present invention.

[0030] Figure 6 The diagram shows the operation of the pad and jack in Embodiment 1 of the present invention.

[0031] Figure 7 The diagram shows the process of back-burning of the weld in Embodiment 2 of the present invention.

[0032] Figure 8 The diagram shows the process of water and fire at the four corners in Embodiment 2 of the present invention.

[0033] Figure 9 The diagram shown is a schematic representation of the water and fire process of the frame in Embodiment 2 of the present invention.

[0034] Figure 10 The diagram shows the water and fire process of the protruding part in Embodiment 2 of the present invention.

[0035] Figure 11 The diagram shows the structure after the jack is removed in Embodiment 2 of the present invention.

[0036] Component designation explanation

[0037] Platform plate 1, slotted column 2, first side plate 211, second side plate 212, column base plate 22, column support plate 23, column reinforcing plate 24, clamping assembly 3, first square steel pipe 311, second square steel pipe 312, third square steel pipe 313, steel pipe reinforcing plate 32, column limiting strip 25, pad plate 4, jack 5, pad plate 41, pad plate 42, thickened plate 6, first thickened plate 61, second thickened plate 62, weld 600, protruding part 610. Detailed Implementation

[0038] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0039] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0040] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0041] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0042] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0043] Example 1

[0044] like Figures 1 to 6 As shown, this embodiment provides a pyrotechnic tooling for a large roll-on / roll-off ship with nested thickened plates. The pyrotechnic tooling specifically includes:

[0045] Platform plate 1, which adopts a square structure and is a frame plate with a hollow center, in order to reduce weight while ensuring the strength of the platform plate. A slotted column 2 is fixed in the middle of each outer edge of the platform plate 1. The slotted column 2 includes a first side plate 211 and a second side plate 212 that are vertically arranged and parallel to each other. A horizontally arranged column base plate 22 and a column support plate 23 are sandwiched between the first side plate 211 and the second side plate 212. The column support plate 23 is arranged parallel to the top of the column base plate 22. A column reinforcing plate 24 is connected to the outer edge of the first side plate 211 and the second side plate 212 away from the center of the frame plate. The column reinforcing plate 24 is perpendicularly connected to the column support plate 23.

[0046] Furthermore, it also includes a clamping assembly 3, which comprises a square steel pipe and a steel pipe reinforcing plate 32. The square steel pipe includes a first square steel pipe 311, a second square steel pipe 312, and a third square steel pipe 313 located on the same plane. The second square steel pipe 312 and the third square steel pipe 313 are symmetrically arranged on both sides of the first square steel pipe 311 and are both vertically connected to the middle of the first square steel pipe 311. The steel pipe reinforcing plate 32 spans across the first square steel pipe 311 and connects the second square steel pipe 312 and the third square steel pipe 313. The steel pipe reinforcing plate 32 is provided with lifting holes for lifting the entire clamping assembly 3. The four ends of the clamping assembly 3 are equidistant and can rotate around the central intersection point for equivalent use.

[0047] The outer end of the square steel tube is used to be inserted into the slot formed by the column support plate 23 and the column reinforcing plate 24 of the slot column 2. The column limiting strip 25 located above the column support plate 23 passes through the first side plate 211 and the second side plate 212, thereby limiting the upper part of the square steel tube to prevent the square steel tube from moving upward.

[0048] The platform plate 1 is used to place the thickened plate 6 to be straightened by fire. The thickened plate includes a first thickened plate 61 and a second thickened plate 62 nested and welded together. The first thickened plate 61 is sleeved on the periphery of the second thickened plate 62. The first thickened plate 61 and the second thickened plate 62 are flush on one side. A weld 600 is formed at the connection between the first thickened plate 61 and the second thickened plate 62.

[0049] A pad 4 is laid on the upper surface of each frame of the first thickened plate 61. The pad 4 is located below each square steel pipe (including the first square steel pipe 311, the second square steel pipe 312 and the third square steel pipe 313). The jack is vertically installed between the pad 4 and each square steel pipe, thereby providing downward pressure to the first thickened plate and realizing the correction of the deformation of the first thickened plate.

[0050] A pad 4 is also laid on the upper surface of the second thickened plate 62. The jack 5 is vertically positioned between the pad 4 and the first square steel pipe 311, thereby providing downward pressure to the second thickened plate 62 and correcting the deformation of the second thickened plate 62. Here, the pad can increase the contact area, disperse the downward pressure, and effectively reduce local abrupt deformation.

[0051] Furthermore, it also includes a welding torch, a pry bar, and a rubber hammer. The welding torch is used to heat the thickened plate to release its internal stress, thereby achieving flame straightening to ensure the flatness of the entire thickened plate. The rubber hammer is used to hammer near the heated area to promote stress release. The pry bar is used to assist in adjusting the position of the thickened plate 6 on the platform plate 1.

[0052] Example 2

[0053] Based on the pyrotechnic tooling in Embodiment 1 above, this embodiment provides a pyrotechnic method for nested thickened plates of large roll-on / roll-off ships, including the following steps:

[0054] S1, such as Figures 1 to 3 As shown, the thickened plate 6 is hoisted onto the platform 1 using an overhead crane. The first thickened plate 61 is 12mm thick, and the second thickened plate 62 is 20mm thick. One side of the first thickened plate 61 and the second thickened plate 62 are flush, while on the other side, the second thickened plate 62 protrudes 8mm from the first thickened plate 61. The second thickened plate 62 must be placed within the open area of ​​the platform 1. If the second thickened plate 62 is not placed within the open area of ​​the platform 1, a pry bar is inserted into the bottom of the thickened plate 6 for adjustment.

[0055] S2, such as Figures 4-6 As shown, the thickened plates are clamped. The clamping assembly 3 is hoisted using the steel pipe reinforcing plate 32 on the clamping assembly 3, and then hoisted above the slot columns 2, ensuring that the four ends of the clamping assembly 3 correspond to the four slot columns 2 respectively. The clamping assembly 3 is placed in the slot of the slot column 2, and the column limiting strip 25 is inserted. The column limiting strip 25 is used to limit the upward mechanical displacement of the clamping assembly 3. The pads 41 and 42 are placed on the first thickened plate 61 and the second thickened plate 62 respectively along the center line of the clamping assembly 3. This includes placing the jack 5 on the pads, with the upper end of the jack pressing against the clamping assembly 3. By adjusting the jack 5, the thickened plate 6 is pressed down and adhered to the surface of the platform plate 1, requiring the flatness of the clamping part to be 0-3mm.

[0056] S3, such as Figure 7 As shown, the weld seams of the first thickened plate 61 and the second thickened plate 62 are subjected to backheating to release stress. The butt joint between the first thickened plate 61 and the second thickened plate 62 is welded by submerged arc welding. Due to welding shrinkage, there is angular deformation and large internal stress at the weld seam caused by welding shrinkage. Heating is performed around the weld seam to release internal stress and correct deformation. The specific operation is as follows:

[0057] The back-heating of the weld seam employs a symmetrical heating technique, with the center of the heating trajectory line approximately 10mm from the weld seam edge. Each heating process requires the steel plate to be air-cooled to room temperature before the next heating process. First, the first thickened plate 61 is heated. The first thickened plate 61 comprises four borders, symmetrical to the second and third borders. Each border forms two heating trajectory lines along its length from its center point outwards. The first, second, third, and fourth borders are heated sequentially, forming a total of eight heating trajectory lines, numbered 1 to 8. Next, the second thickened plate 62 is heated. The eight heating trajectory lines of the second thickened plate 62 are symmetrically distributed with respect to the eight heating trajectory lines of the first thickened plate 61 about the weld seam, numbered 9 to 16.

[0058] The firing parameters for the eight heating tracks of the first thickened plate 61 are as follows: medium-sized heating nozzle, heating temperature 500℃~600℃, heating speed 8~15mm / s, heating width 10~15mm, and flame core distance from the plate surface 2~3mm. The firing parameters for the eight heating tracks of the first thickened plate 61 are as follows: medium-sized heating nozzle, heating temperature ≤850℃, heating speed 5~10mm / s, heating width 15~30mm, and flame core distance from the plate 2~3mm. During the firing process, a rubber hammer is used to strike the perimeter of the firing area, which can effectively release residual stress.

[0059] S4, such as Figure 8 As shown, the four corners of the first thickened plate 61 are subjected to water-fire stress relief. Since the thickness of the first thickened plate 61 is less than that of the second thickened plate 62, the first thickened plate 61 is more susceptible to deformation due to internal stress. According to the internal stress distribution rules, the internal stress at the four corners of the first thickened plate 61 is greater than the internal stress along the four edges. Therefore, water-fire stress relief is performed at the four corners first. The length of the heating trajectory line at the four corners is 2 / 3 of the distance between the weld at the corner and the outer corner of the first thickened plate, and the heating direction is from the inside out. The heating sequence is performed sequentially, forming four heating trajectory lines: the first, second, third, and fourth heating trajectory lines are performed sequentially. The second and fourth heating trajectory lines are located diagonally opposite the first and third heating trajectory lines, respectively, in sequence 1 to 4. The heating parameters are: medium-sized heating nozzle, heating temperature 500℃~600℃, minimum water-fire spacing (heating width) 20~30mm, heating speed 13~20mm / s, heating width 10~15mm, and flame core distance from the plate 2~3mm. The process involves using a rubber hammer to strike the area around the pyrotechnic device, which effectively releases residual stress.

[0060] S5, such as Figures 9-10As shown, the four edges of the first thickened plate 61 are subjected to water-fire stress relief. The length of the heating trajectory line is 2 / 3 of the distance between the butt weld and the outer edge of the first thickened plate 61. The heating direction is from the inside out, and the heating trajectory line is perpendicular to the length direction of the edge. Each edge forms two symmetrical heating trajectory lines. The first, second, third, and fourth edges are subjected to heat treatment in sequence. The heat treatment sequence is performed sequentially, from sequence 1 to sequence 8. The horizontal distance between the heating trajectory line and the highest point of the protrusion 610 of the first thickened plate 61 is 50-70 mm. The applicable plate thickness is 8-12 mm. The heating nozzle is medium-sized. The heating temperature is 500℃-600℃. The minimum water-fire distance is 20-30 mm. The heating speed is 13-20 mm / s. The heating width is 10-15 mm. The flame core distance from the plate is 2-3 mm. During the process, a rubber hammer is used to hammer around the heat treatment area, which can effectively release residual stress.

[0061] S6, such as Figures 10-11 As shown, after reviewing the accuracy data and removing jack 5, measure the flatness of the first thickened plate 61, requiring a flatness of 0-3mm. If the accuracy requirements are not met in any area, perform local water-fire treatment. The horizontal distance between the heating trajectory line and the highest point of the protrusion 610 of the first thickened plate 61 is 50-70mm, applicable to plate thicknesses of 8-12mm, medium-sized heating nozzle, heating temperature of 500℃-600℃, minimum water-fire distance of 20-30mm, heating speed of 13-20mm / s, heating width of 10-15mm, and flame core distance from the plate of 2-3mm. During the process, use a rubber mallet to hammer around the treatment area to effectively release residual stress.

[0062] In summary, this invention provides a pyrotechnic fixture and method for a nested thickened plate of a large roll-on / roll-off ship. The pyrotechnic fixture includes a platform plate and multiple slotted columns fixed to the outer edge of the platform plate. Slots are formed on the upper part of the slotted columns to accommodate the ends of the square steel tubes of the clamping assembly. In use, the thickened plate to be pyrotechnically corrected is placed on the platform plate, and a pad is laid on the upper surface of the thickened plate. A jack is vertically positioned between the pad and the square steel tubes to provide downward pressure to the thickened plate, thereby correcting the deformation of the thickened plate. Then, pyrotechnic heating is performed according to a specific procedure to release internal stress and correct the deformation, thus ensuring the flatness of the thickened plate.

[0063] This pyrotechnic method can effectively control the construction accuracy of nested thickened plates, effectively correcting the thickened plates to the allowable accuracy range. The pyrotechnic process constraint method and the new pyrotechnic method adopted ensure the high-precision construction of nested thickened plates, reduce the amount of pyrotechnic work and rework, reduce construction difficulty, and reduce labor costs.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A pyrotechnic method using a pyrotechnic tool, characterized in that, The pyrotechnic tooling includes a platform plate, and a slotted column is fixed in the middle of each outer edge of the platform plate. The slotted column includes a first side plate and a second side plate that are vertically arranged and parallel to each other. A horizontally arranged column base plate and a column support plate are sandwiched between the first side plate and the second side plate. The column support plate is arranged parallel to the top of the column base plate. A column reinforcing plate is connected to the outer edge of the first side plate and the second side plate away from the center of the frame plate. The column reinforcing plate and the column support plate are vertically connected to form a slot. The pyrotechnic tooling also includes a clamping assembly, which comprises a square steel pipe. The square steel pipe includes a first square steel pipe, a second square steel pipe, and a third square steel pipe located on the same plane. The second square steel pipe and the third square steel pipe are symmetrically arranged on both sides of the first square steel pipe and are both vertically connected to the middle of the first square steel pipe. The outer end of the square steel pipe is used to be inserted into the slot of the slot column. The column limiting strip located above the column support plate passes through the first side plate and the second side plate, thereby limiting the upper part of the square steel pipe. The platform plate is used to place the thickened plate to be straightened by fire. The upper surface of the thickened plate is covered with a pad, which is located under each square steel pipe. The jack is vertically set between the pad and each square steel pipe to provide downward pressure to the thickened plate and realize the correction of the deformation of the thickened plate. The pyrotechnic method includes the following steps: S1. Lifting the thickened plate: Using a crane, the thickened plate is lifted onto the platform plate; the thickened plate includes a first thickened plate and a second thickened plate that are nested and welded together, with the first thickened plate fitted around the periphery of the second thickened plate; S2. Press the thickened plate, hoist the pressing assembly, and hoist the pressing assembly to the top of the slot column, ensuring that the four ends of the pressing assembly correspond to the four slot columns respectively; place the pressing assembly in the slot of the slot column and insert the column limit strip; S3. Back-heating is performed on both sides of the weld seam of the first and second thickened plates to release stress and form multiple heating trajectory lines. During the process, the first thickened plate is heated first. The first thickened plate includes four frames. The first frame is symmetrical with the second frame, and the third frame is symmetrical with the fourth frame. Each frame forms two heating trajectory lines along the length of the frame from the center point to both sides. The first, second, third, and fourth frames are heated in sequence to form a total of 8 heating trajectory lines. Then the second thickened plate is heated. The 8 heating trajectory lines of the second thickened plate are symmetrically distributed with the 8 heating trajectory lines of the first thickened plate about the weld seam. During the process, a rubber hammer is used to hammer the perimeter of the heated plate to release residual stress.

2. The pyrotechnic method according to claim 1, characterized in that: In step S3, the heating trajectory line is parallel to the weld, and the center of the heating trajectory line is 8-15mm away from the edge of the weld.

3. The pyrotechnic method according to claim 1, characterized in that, It also includes the following steps: S4. Release the stress at the four corners of the first thickened plate with water and fire. The fire process is carried out in sequence to form four heating trajectory lines. The heating direction is from the inside to the outside. The first, second, third and fourth heating trajectory lines are carried out in sequence. The second and fourth heating trajectory lines are located at the diagonal of the first and third heating trajectory lines, respectively. During the process, a rubber hammer is used to hammer the perimeter of the fire process.

4. The pyrotechnic method according to claim 3, characterized in that, It also includes the following steps: S5. The four edges of the first thickened plate are heated by water and fire to release stress. The heating direction is from the inside to the outside, and the heating trajectory line is perpendicular to the length direction of the edge. Each edge forms two symmetrical heating trajectory lines. The first, second, third and fourth edges are heated in sequence. The horizontal distance between the heating trajectory line and the highest point of the protrusion of the first thickened plate is 50-70mm. During the process, a rubber hammer is used to hammer the perimeter of the heated area.

5. The pyrotechnic method according to claim 4, characterized in that, It also includes the following steps: S6. After rechecking the accuracy data and removing the jack, measure the flatness of the first thickened plate. The flatness should be 0-3mm. If the accuracy requirements are not met in some areas, perform local water-fire treatment. The horizontal distance between the heating trajectory line and the highest point of the protrusion of the first thickened plate should be 50-70mm. During the process, use a rubber hammer to hammer the area around the fire treatment.

6. The pyrotechnic method according to claim 1, characterized in that: The platform plate is square with a hollow center.

7. The pyrotechnic method according to claim 1, characterized in that: The clamping assembly also includes a steel pipe reinforcing plate; the steel pipe reinforcing plate spans above the first steel pipe and connects to the second and third steel pipes, and the steel pipe reinforcing plate is provided with lifting holes.

8. The pyrotechnic method according to claim 1, characterized in that: The first thickened plate and the second thickened plate are flush on one side, and a weld is formed at the connection between the first thickened plate and the second thickened plate.

9. The pyrotechnic method according to claim 1, characterized in that: The pyrotechnic tooling also includes a welding torch, a pry bar, and a rubber hammer. The welding torch is used to heat the thickened plate to release its internal stress, thereby achieving pyrotechnic straightening to ensure the flatness of the entire thickened plate. The rubber hammer is used to hammer near the heated area to promote stress release. The pry bar is used to assist in adjusting the position of the thickened plate on the platform plate.

Images