A special equipment for welding large thick-wall angle steel square

Abstract

The application discloses a kind of special equipment for welding large thick-wall angle steel square, it is related to the technical field of angle steel square welding, including workbench, inner welding assembly and outer welding assembly, the lower mounting bracket is fixed in the upper middle part of the workbench, and the lower mounting bracket side is equipped with lower telescopic rod, the upper of the lower telescopic rod is fixed with lower locating block, and lower locating block is located in the upper of the inner side of lower mounting bracket, the inner welding assembly is installed in the upper of the inner side of lower locating block, the upper of the workbench is symmetrically equipped with displacement component in front and back two sides, and the upper of displacement component is equipped with outer welding assembly.The special equipment for welding large thick-wall angle steel square.Outer welding assembly cooperates inner welding assembly to be able to simultaneously carry out welding operation to the inner and outer sides of two weld seams of angle steel square, meet the requirement of weld root full penetration and double-sided forming, production efficiency is higher, it is advantageous to batch completion welding task.

Description

Technical Field

[0001] This invention relates to the field of welding technology for assembling angle steel into square sections, specifically to a special welding equipment for assembling large, thick-walled angle steel into square sections. Background Technology

[0002] The upper and lower supports are key load-bearing components of the tower crane, transferring the weight and bending moment from the upper part of the crane to the standard section. Affected by both suspended and unloaded loads, the upper and lower supports must withstand alternating loads, and the quality of the welds in their box-type structures determines their safety performance during use. Since the upper and lower supports of tower cranes are generally welded from 70-120mm thick plates, their manufacturing process includes welding large, thick-walled angle steel sections and welding thick-plate box-type structures. Traditional welding techniques cannot meet the requirements of full penetration at the weld root and double-sided forming, resulting in welding quality defects. Furthermore, because the angle steel sections are long and slender rods, deformation is prone to occur during welding; and the large residual stress generated during thick-plate welding leads to problems such as lamellar tearing of the base material after weld cooling, posing significant safety hazards.

[0003] In view of this, we have studied and improved the structure of existing equipment and proposed a special welding equipment for assembling large thick-walled angle steel. Summary of the Invention

[0004] To address the above problems, this invention provides a special welding equipment for assembling large, thick-walled angle steel.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a special welding equipment for assembling large thick-walled angle steel, comprising a workbench, an inner welding assembly, and an outer welding assembly. A lower mounting frame is fixed to the upper center of the workbench, and a lower telescopic rod is mounted on one side of the lower mounting frame. A lower positioning block is fixed above the lower telescopic rod, and the lower positioning block is located above the inner side of the lower mounting frame. The inner welding assembly is mounted above the inner side of the lower positioning block. Displacement assemblies are symmetrically mounted on the front and rear sides of the upper part of the workbench, and a welding assembly is mounted above the displacement assemblies. The assembly includes an external welding component, comprising a lifting rod, a fixed base, a mounting plate, an external welding head, a detection sensor, an electric telescopic rod, a preheating plate, and a preheating layer. The lifting rod is fixed above a fixed base, and the fixed base is fixed above a mounting plate. An external welding head is installed on the side of the mounting plate near the lower mounting frame, and detection sensors are installed on both sides of the mounting plate. Electric telescopic rods are installed on the outermost ends of the mounting plate, and a preheating plate is installed on the side of the electric telescopic rod near the lower mounting frame. A preheating layer is provided on the inner side of the preheating plate.

[0006] Furthermore, the inner welding assembly includes a first motor, a first lead screw, and a first movable sleeve. The first lead screw is provided on one side of the output shaft of the first motor, and the first movable sleeve is sleeved on the outer side of the first lead screw, and the first movable sleeve is slidably connected to the inner wall of the lower positioning block.

[0007] Furthermore, the inner welding assembly also includes a fixed plate, a rotating shaft, and an inner welding head. The fixed plate is fixed at the upper center of the first movable sleeve, and the inner welding head is rotatably mounted on both the front and rear sides of the fixed plate via the rotating shaft.

[0008] Furthermore, the displacement assembly includes an outer frame, a second motor, and a second lead screw. The second motor is installed on one side of the inner side of the outer frame, and the second lead screw is provided on one side of the output shaft of the second motor.

[0009] Furthermore, the displacement assembly also includes a second movable sleeve and a support plate. The second movable sleeve is sleeved on the outer side of the second lead screw, and the second movable sleeve is slidably connected to the inner wall of the outer frame. The support plate is fixed above the second movable sleeve, and the support plate is bolted to the lifting rod.

[0010] Furthermore, the inner wall of the preheating plate and the cross-section of the preheating layer are both V-shaped, and the preheating layer has a built-in far-infrared heating module.

[0011] Furthermore, a rear plate is fixed to the upper rear side of the workbench, and a docking adjustment assembly is installed on one side of the upper rear plate. The docking adjustment assembly includes a motor mounting frame, a linear motor, a fixed connecting rod, and an upper plate. Two linear motors are installed inside the motor mounting frame, and a fixed connecting rod is welded to one side of the linear motor. One end of the fixed connecting rod is fixed to the upper plate.

[0012] Furthermore, a hydraulic telescopic rod is installed below the upper plate, and an upper mounting frame is fixed below the hydraulic telescopic rod. An upper telescopic rod is installed on one side of the upper mounting frame, and an upper positioning block is fixed below the upper telescopic rod, with the upper positioning block located on the inner lower side of the upper mounting frame.

[0013] Furthermore, the inner sides of both the lower mounting bracket and the upper mounting bracket are provided with right-angled triangular grooves, and the vertical center lines of the lower mounting bracket and the lower positioning block, and the upper mounting bracket and the upper positioning block coincide.

[0014] Furthermore, the included angle between the lower positioning block and the upper positioning block is a right angle, and the outer surfaces of the lower positioning block and the upper positioning block, as well as the inner surfaces of the lower mounting bracket and the upper mounting bracket, are all provided with heating layers.

[0015] Compared with the prior art, the present invention provides a special welding equipment for assembling large thick-walled angle steel squares, which has the following beneficial effects:

[0016] 1. By creating right-angled triangular grooves on the inner sides of both the lower and upper mounting brackets, an angle steel can be placed between the lower mounting bracket and the lower positioning block, and simultaneously between the upper positioning block and the upper mounting bracket. This allows the lower mounting bracket and lower positioning block, and the upper mounting bracket and upper positioning block, to cooperate in positioning the two angle steels, preventing displacement and welding deformation during the welding process. The lower telescopic rod facilitates adjustment of the position of the lower positioning block, thereby adjusting the distance between it and the lower mounting bracket. This design is suitable for thick-walled angle steels of different thicknesses.

[0017] 2. By installing heating wires in the heating layers on the outer surfaces of the lower and upper positioning blocks and the inner surfaces of the lower and upper mounting frames, the angle steel between them can be heated, causing it to expand and contract simultaneously with the welding area, thereby reducing welding stress. The movement of the linear motor inside the motor mounting frame facilitates the movement of the fixed connecting rod and the upper plate, which in turn facilitates the movement of the hydraulic telescopic rod and the upper mounting frame. Furthermore, the hydraulic telescopic rod facilitates the adjustment of the height of the upper mounting frame, allowing the upper angle steel to be joined with the lower angle steel without the need for manual welding. This improves welding accuracy and ensures the welding quality of the thick plate box structure.

[0018] 3. The first motor facilitates the rotation of the first lead screw, which in turn drives the first moving sleeve to move laterally. This allows the fixed plate and the two inner welding heads to move laterally while simultaneously welding the inner side of the joint between the two angle steel squares. One side of the rotating shaft is driven by a micro servo motor, which facilitates the rotation of the inner welding heads and adjusts their welding position to correspond with the welding position between the angle steel squares.

[0019] 4. The lifting rod facilitates the adjustment of the position and height of the fixed base, mounting plate, and external welding joint, ensuring that the external welding joint corresponds to the welding position between the angle steel sections. The detection sensor, specifically an ultrasonic sensor, can detect the weld seam based on ultrasonic echoes, preventing welding quality defects. The electric telescopic rod facilitates the extension and retraction of the preheating plate and preheating layer, allowing the preheating layer to be close to the welding area of ​​the angle steel section. This enables localized preheating of the welding area before welding, allowing the angle steel to absorb heat effectively. Far-infrared The internal molecules and atoms then "resonate" to generate heat energy, thereby achieving... add hot The purpose is to reduce the temperature gradient in the welding zone and structure, thereby reducing the degree of constraint and achieving the goal of reducing welding internal stress.

[0020] 5. The second motor facilitates the rotation of the second lead screw, which in turn drives the lateral movement of the second moving sleeve. This allows the second moving sleeve to move the upper support plate and the outer welding assembly horizontally, facilitating the use of the outer welding assembly. Together with the inner welding assembly, it enables simultaneous welding of both the inner and outer sides of the two weld seams of the angle steel joint, meeting the requirements of full penetration at the weld root and double-sided forming. This results in high production efficiency and is beneficial for batch welding tasks. Furthermore, the detection sensors and preheating plates are symmetrically arranged with respect to the mounting plate in two sets, allowing the outer welding head to be used back and forth. The appropriate detection sensor and preheating plate can be selected according to the welding direction, which is quite convenient. Attached Figure Description

[0021] Figure 1 This is a frontal three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a top view of the mounting bracket of the present invention;

[0023] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0024] Figure 4 This is a front view structural diagram of the external welding assembly of the present invention;

[0025] Figure 5 This is a rear view structural schematic diagram of the external welding assembly of the present invention;

[0026] Figure 6 This is a three-dimensional structural diagram of the mounting bracket of the present invention;

[0027] Figure 7 This is a bottom view of the mounting bracket of the present invention.

[0028] In the diagram: 1. Workbench; 2. Lower mounting bracket; 3. Lower telescopic rod; 4. Lower positioning block; 5. Inner welding assembly; 501. First motor; 502. First lead screw; 503. First moving sleeve; 504. Fixed plate; 505. Rotating shaft; 506. Inner welding head; 6. Displacement assembly; 601. Outer frame; 602. Second motor; 603. Second lead screw; 604. Second moving sleeve; 605. Support plate; 7. Outer welding assembly; 01. Lifting rod; 702. Fixed base; 703. Mounting plate; 704. External welded head; 705. Detection sensor; 706. Electric telescopic rod; 707. Preheating plate; 708. Preheating layer; 8. Rear plate; 9. Docking and adjustment assembly; 901. Motor mounting frame; 902. Linear motor; 903. Fixed connecting rod; 904. Upper plate; 10. Hydraulic telescopic rod; 11. Upper mounting bracket; 12. Upper telescopic rod; 13. Upper positioning block. Detailed Implementation

[0029] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0030] Please see Figures 1 to 2 , Figures 6 to 7 This embodiment of a welding equipment for assembling large thick-walled angle steel squares includes a workbench 1, an inner welding assembly 5 and an outer welding assembly 7. A lower mounting frame 2 is fixed at the upper center of the workbench 1, and a lower telescopic rod 3 is installed on one side of the lower mounting frame 2. A lower positioning block 4 is fixed above the lower telescopic rod 3, and the lower positioning block 4 is located on the upper inner side of the lower mounting frame 2.

[0031] Please see Figure 1 , Figures 6 to 7 A rear plate 8 is fixed on the upper rear side of the workbench 1, and a docking adjustment assembly 9 is installed on one side of the upper part of the rear plate 8. The docking adjustment assembly 9 includes a motor mounting frame 901, a linear motor 902, a fixed connecting rod 903 and an upper plate 904. Two linear motors 902 are installed inside the motor mounting frame 901, and a fixed connecting rod 903 is welded to one side of the linear motor 902. The upper plate 904 is fixed to one end of the fixed connecting rod 903.

[0032] A hydraulic telescopic rod 10 is installed below the upper plate 904, and an upper mounting bracket 11 is fixed below the hydraulic telescopic rod 10. An upper telescopic rod 12 is installed on one side of the upper mounting bracket 11, and an upper positioning block 13 is fixed below the upper telescopic rod 12. The upper positioning block 13 is located on the inner side of the upper mounting bracket 11. The inner sides of the lower mounting bracket 2 and the upper mounting bracket 11 are provided with right-angled triangular grooves, and the vertical center lines of the lower mounting bracket 2 and the lower positioning block 4, and the upper mounting bracket 11 and the upper positioning block 13 coincide. The included angle between the lower positioning block 4 and the upper positioning block 13 is a right angle, and a heating layer is provided on the outer side of the lower positioning block 4 and the upper positioning block 13 and the inner side of the lower mounting bracket 2 and the upper mounting bracket 11.

[0033] The specific operation is as follows: the inner sides of the lower mounting bracket 2 and the upper mounting bracket 11 are provided with right-angled triangular grooves, so that an angle steel can be set between the lower mounting bracket 2 and the lower positioning block 4, and an angle steel can be set between the upper positioning block 13 and the upper mounting bracket 11. Thus, the lower mounting bracket 2 and the lower positioning block 4, and the upper mounting bracket 11 and the upper positioning block 13 cooperate with each other to position the two angle steels, preventing the welding deformation caused by displacement during the welding process. The lower telescopic rod 3 facilitates the adjustment of the position of the lower positioning block 4 and thus the distance between it and the lower mounting bracket 2. It is suitable for thick-walled angle steels of different thicknesses.

[0034] Heating wires are installed in the heating layers on the outer sides of the lower positioning block 4 and the upper positioning block 13, as well as the inner sides of the lower mounting bracket 2 and the upper mounting bracket 11, to heat the angle steel between them, causing it to expand and contract simultaneously with the welding area, thereby reducing welding stress. The movement of the linear motor 902 inside the motor mounting frame 901 facilitates the movement of the fixed connecting rod 903 and the upper plate 904, which in turn facilitates the movement of the hydraulic telescopic rod 10 and the upper mounting bracket 11. Furthermore, the hydraulic telescopic rod 10 facilitates the adjustment of the height of the upper mounting bracket 11, allowing the upper angle steel to be joined with the lower angle steel without the need for manual welding of the two angle steels. This improves welding accuracy and ensures the welding quality of the thick plate box structure.

[0035] Please see Figures 2 to 3 The inner welding assembly 5 is installed on the upper inner side of the lower positioning block 4. The inner welding assembly 5 includes a first motor 501, a first lead screw 502, and a first movable sleeve 503. The first lead screw 502 is provided on one side of the output shaft of the first motor 501, and the first movable sleeve 503 is sleeved on the outer side of the first lead screw 502. The first movable sleeve 503 is slidably connected to the inner wall of the lower positioning block 4. The inner welding assembly 5 also includes a fixed plate 504, a rotating shaft 505, and an inner welding head 506. The fixed plate 504 is fixed at the upper middle part of the first movable sleeve 503, and the inner welding head 506 is rotatably installed on both the front and rear sides of the fixed plate 504 through the rotating shaft 505.

[0036] The specific operation is as follows: the first motor 501 drives the first lead screw 502 to rotate, thereby driving the first moving sleeve 503 to move laterally, so that the fixed plate 504 and the two inner welding heads 506 can move laterally and simultaneously perform welding processing on the inner side of the splice between the two angle steel squares. One side of the rotating shaft 505 is driven by a micro servo motor. The rotating shaft 505 drives the inner welding head 506 to rotate, thereby adjusting the welding position of the inner welding head 506 so that it corresponds to the welding position between the angle steel squares.

[0037] Please see Figure 2 and Figure 4 The workbench 1 is symmetrically equipped with displacement components 6 on the front and rear sides above it, and an outer welding component 7 is installed above the displacement components 6. The displacement components 6 include an outer frame 601, a second motor 602 and a second lead screw 603. The second motor 602 is installed on one side of the inner side of the outer frame 601, and the second lead screw 603 is provided on one side of the output shaft of the second motor 602. The displacement components 6 also include a second moving sleeve 604 and a support plate 605. The second moving sleeve 604 is sleeved on the outer side of the second lead screw 603, and the second moving sleeve 604 is slidably connected to the inner wall of the outer frame 601. The support plate 605 is fixed on the top of the second moving sleeve 604, and the support plate 605 is bolted to the lifting rod 701.

[0038] The specific operation is as follows: the second motor 602 drives the rotation of the second lead screw 603, which in turn drives the lateral movement of the second moving sleeve 604. This allows the second moving sleeve 604 to drive the upper support plate 605 and the outer welding assembly 7 to move horizontally, facilitating the use of the outer welding assembly 7. Together with the inner welding assembly 5, it can simultaneously perform welding operations on the inner and outer sides of the two welds of the angle steel square, meeting the requirements of full penetration at the weld root and double-sided forming. This results in high production efficiency and is conducive to completing welding tasks in batches.

[0039] Please see Figure 2 , Figures 4 to 5 The external welding assembly 7 includes a lifting rod 701, a fixed base 702, a mounting plate 703, an external welding head 704, a detection sensor 705, an electric telescopic rod 706, a preheating plate 707, and a preheating layer 708. The fixed base 702 is fixed above the lifting rod 701, and the mounting plate 703 is fixed above the fixed base 702. The external welding head 704 is installed on the side of the mounting plate 703 near the lower mounting frame 2, and the detection sensor 705 is installed on both sides of the mounting plate 703. The electric telescopic rod 706 is installed on the outermost ends of both ends of the mounting plate 703, and the preheating plate 707 is installed on the side of the electric telescopic rod 706 near the lower mounting frame 2. The preheating layer 708 is provided on the inner side of the preheating plate 707. The inner wall of the preheating plate 707 and the cross-section of the preheating layer 708 are both V-shaped structures, and the preheating layer 708 has a built-in far-infrared heating module.

[0040] The specific operation is as follows: The lifting rod 701 facilitates the adjustment of the position and height of the fixed base 702, mounting plate 703, and outer welding head 704, ensuring that the outer welding head 704 corresponds to the welding position between the angle steel sections. The detection sensor 705, specifically an ultrasonic sensor, can detect the weld seam after welding based on ultrasonic echoes, avoiding welding quality defects. The electric telescopic rod 706 facilitates the telescopic adjustment of the position of the preheating plate 707 and preheating layer 708, allowing the preheating layer 708 to be close to the welding area of ​​the angle steel section, thus enabling local preheating of the welding area before welding, allowing the angle steel to absorb heat. Far Infrared outside line The internal molecules and atoms then "resonate" to generate heat energy, thereby achieving... heating The purpose is to reduce the temperature gradient of the welding zone and structure, reduce the constraint, and reduce the internal stress of welding. The detection sensor 705 and the preheating plate 707 are symmetrically arranged in two sets about the mounting plate 703 so that the outer welding head 704 can be used back and forth. The corresponding detection sensor 705 and preheating plate 707 can be selected according to the welding direction, which is more convenient.

[0041] Working principle: In use, firstly, according to the different thicknesses of the thick-walled angle steel, the positions of the lower positioning block 4 and the upper positioning block 13 are adjusted by the lower telescopic rod 3 and the upper telescopic rod 12 respectively, thereby adjusting the distance between them and the lower mounting frame 2. Then, an angle steel is set between the lower mounting frame 2 and the lower positioning block 4, and an angle steel can be set on the upper positioning block 13 and the upper mounting frame 11. Thus, the lower mounting frame 2 and the lower positioning block 4, and the upper mounting frame 11 and the upper positioning block 13 cooperate with each other to position the two angle steels. Then, the linear motor 902 moves inside the motor mounting frame 901 to drive the fixed connecting rod 903 and the upper plate 904 to move, thereby driving the hydraulic telescopic rod 10 and the upper mounting frame 11 to move. The height of the upper mounting frame 11 is adjusted by raising and lowering the hydraulic telescopic rod 10, thereby allowing the upper angle steel to connect with the lower angle steel.

[0042] Then, the inner welding assembly 5 and the outer welding assembly 7 can be activated simultaneously. During this process, the heating layers of the outer sides of the lower positioning block 4 and the upper positioning block 13, as well as the inner sides of the lower mounting bracket 2 and the upper mounting bracket 11, are equipped with heating wires that can heat the angle steel between them, causing it to expand and contract simultaneously with the welding area. This reduces the welding stress. Since one side of the rotating shaft 505 is driven by a micro servo motor, the inner welding head 506 can be rotated by the rotating shaft 505, thereby adjusting the welding position of the inner welding head 506 so that it corresponds to the welding position between the angle steel pieces. Then, the position height of the fixed seat 702, the mounting plate 703, and the outer welding head 704 can be adjusted by lifting the lifting rod 701 so that the outer welding head 704 corresponds to the welding position between the angle steel pieces.

[0043] Next, the first motor 501 drives the first lead screw 502 to rotate, which in turn drives the first moving sleeve 503 to move laterally. This allows the fixed plate 504 and the two inner welding heads 506 to move laterally, simultaneously performing welding on the inner side of the joint between the two angle steel squares. The position of the preheating plate 707 and the preheating layer 708 can also be adjusted by extending and retracting the electric telescopic rod 706, so that the preheating layer 708 is close to the welding area of ​​the angle steel square. This allows for local preheating of the welding area before welding, enabling the angle steel to absorb heat. Far-infrared The internal molecules and atoms then "resonate" to generate heat energy, thereby achieving... heatingThe purpose is to reduce the temperature gradient between the welding zone and the structure, reduce the constraint, and reduce the internal stress of welding. Then, the second motor 602 drives the rotation of the second lead screw 603, so that the second moving sleeve 604 can drive the upper support plate 605 and the outer welding assembly 7 to move horizontally, so that the outer welding head 704 can perform welding operations. Therefore, welding operations can be carried out on the inner and outer sides of the two welds of the angle steel square at the same time, which meets the requirements of full penetration of the weld root and double-sided forming, and the production efficiency is high. At this time, the welds after welding can be inspected, and the locations with welds can be re-welded to avoid welding quality defects. In this way, the entire process of using the special welding equipment for large thick-walled angle steel squares is completed.

[0044] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A special welding equipment for assembling large, thick-walled angle steel squares, characterized in that, The assembly includes a workbench (1), an inner welding assembly (5), and an outer welding assembly (7). A lower mounting bracket (2) is fixed at the upper center of the workbench (1), and a lower telescopic rod (3) is installed on one side of the lower mounting bracket (2). A lower positioning block (4) is fixed above the lower telescopic rod (3), and the lower positioning block (4) is located above the inner side of the lower mounting bracket (2). The inner welding assembly (5) is installed above the inner side of the lower positioning block (4). Displacement assemblies (6) are symmetrically installed on the front and rear sides of the upper part of the workbench (1), and an outer welding assembly (7) is installed above the displacement assembly (6). The outer welding assembly (7) includes a lifting rod (701), a fixed seat (702), a mounting plate (703), and an outer welding head (704). The system includes a detection sensor (705), an electric telescopic rod (706), a preheating plate (707), and a preheating layer (708). A fixed base (702) is fixed above the lifting rod (701), and an mounting plate (703) is fixed above the fixed base (702). An external welding head (704) is installed on the side of the middle of the mounting plate (703) near the lower mounting frame (2), and detection sensors (705) are installed on both sides of the mounting plate (703). An electric telescopic rod (706) is installed on the outermost ends of both ends of the mounting plate (703), and a preheating plate (707) is installed on the side of the electric telescopic rod (706) near the lower mounting frame (2). A preheating layer (708) is provided on the inner side of the preheating plate (707). A rear plate (8) is fixed on the upper rear side of the workbench (1), and a docking adjustment assembly (9) is installed on one side of the upper rear plate (8). The docking adjustment assembly (9) includes a motor mounting frame (901), a linear motor (902), a fixed connecting rod (903), and an upper plate (904). Two linear motors (902) are installed inside the motor mounting frame (901), and a fixed connecting rod (903) is welded to one side of the linear motor (902). One end of the fixed connecting rod (903) is fixed to the upper plate (904). A hydraulic telescopic rod (10) is installed below the upper plate (904), and an upper mounting frame (11) is fixed below the hydraulic telescopic rod (10). An upper telescopic rod (12) is installed on one side of the upper mounting frame (11), and an upper positioning block (13) is fixed below the upper telescopic rod (12). The upper positioning block (13) is located on the inner side of the upper mounting frame (11).

2. The special welding equipment for assembling large thick-walled angle steel according to claim 1, characterized in that, The inner welding assembly (5) includes a first motor (501), a first lead screw (502) and a first movable sleeve (503). The first lead screw (502) is provided on one side of the output shaft of the first motor (501), and the first movable sleeve (503) is sleeved on the outer side of the first lead screw (502). The first movable sleeve (503) is slidably connected to the inner wall of the lower positioning block (4).

3. The special welding equipment for assembling large thick-walled angle steel according to claim 2, characterized in that, The inner welding assembly (5) further includes a fixing plate (504), a rotating shaft (505) and an inner welding head (506). The fixing plate (504) is fixed at the upper center of the first movable sleeve (503), and the inner welding head (506) is rotatably installed on both the front and rear sides of the fixing plate (504) through the rotating shaft (505).

4. The special welding equipment for assembling large thick-walled angle steel according to claim 1, characterized in that, The displacement component (6) includes an outer frame (601), a second motor (602), and a second lead screw (603). The second motor (602) is installed on one side of the inner side of the outer frame (601), and the second lead screw (603) is provided on one side of the output shaft of the second motor (602).

5. The special welding equipment for assembling large thick-walled angle steel according to claim 4, characterized in that, The displacement assembly (6) further includes a second movable sleeve (604) and a support plate (605). The second movable sleeve (604) is sleeved on the outer side of the second lead screw (603), and the second movable sleeve (604) is slidably connected to the inner wall of the outer frame (601). The support plate (605) is fixed above the second movable sleeve (604), and the support plate (605) is bolted to the lifting rod (701).

6. The special welding equipment for assembling large thick-walled angle steel according to claim 1, characterized in that, The inner wall of the preheating plate (707) and the cross-section of the preheating layer (708) are both "V" shaped, and the preheating layer (708) has a built-in far-infrared heating module.

7. The special welding equipment for assembling large thick-walled angle steel according to claim 1, characterized in that, The inner sides of the lower mounting bracket (2) and the upper mounting bracket (11) are provided with right-angled triangular grooves, and the vertical center lines of the lower mounting bracket (2) and the lower positioning block (4), and the upper mounting bracket (11) and the upper positioning block (13) coincide.

8. The special welding equipment for assembling large thick-walled angle steel according to claim 7, characterized in that, The included angle between the lower positioning block (4) and the upper positioning block (13) is a right angle, and the outer surfaces of the lower positioning block (4) and the upper positioning block (13) and the inner surfaces of the lower mounting bracket (2) and the upper mounting bracket (11) are all provided with heating layers.

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