Positioning device for pipe box welding and use method thereof

Abstract

The present application belongs to the technical field of pipe-box welding, and discloses a positioning device for pipe-box welding and a method of use, wherein the positioning device comprises a base, a supporting assembly arranged on the base, a lifting assembly arranged on the base and a positioning assembly arranged on the base, wherein the positioning assembly is located between the supporting assembly and the lifting assembly and can move in the vertical direction to support and position the butt pipe flange, the supporting assembly is used to support the pipe-box flange, and the lifting assembly can move in the vertical direction to adjust the cylinder so that the central axis of the cylinder is in a horizontal state. The use of the positioning device in the present application avoids the need to pre-weld a process plate on the pipe during the auxiliary installation of the butt pipe, thereby simplifying the assembly and welding steps of the butt pipe to improve the assembly and welding efficiency of the butt pipe, while avoiding the situation of occupying the vehicle when assembling and welding the butt pipe, and also increasing the safety when assembling and welding the butt pipe.

Description

Technical Field

[0001] The present application belongs to the technical field of pipe-box welding, and specifically relates to a positioning device for pipe-box welding and a method of using the same. Background Art

[0002] The pipe box plays a key role in heat exchangers and many other fluid handling equipment. It includes a cylinder, a pipe box flange at one end of the cylinder, a head at the other end of the cylinder, a side pipe provided on the periphery of the cylinder, and an end pipe provided on the head. The ends of the side pipe and the end pipe are both provided with pipe flanges.

[0003] At present, when welding the butt joint, it is necessary to weld a process plate on the flange of the butt joint in advance, and then use a crane to lift the butt joint to place the butt joint at the busbar opening of the cylinder, and then use a level to adjust the verticality of the butt joint and the cylinder to achieve the centering of the butt joint. Finally, wait for the welding of the butt joint and the cylinder to be completed before grinding off the process plate. This will result in the need to occupy crane resources when welding the butt joint, while increasing the difficulty of assembling and welding the butt joint, and affecting the assembly welding efficiency and safety of the butt joint. Summary of the invention

[0004] The present application provides a positioning device for pipe box welding to solve at least one of the above technical problems.

[0005] The technical solution adopted in this application is:

[0006] A positioning device for pipe-box welding comprises a base, a supporting assembly arranged on the base, a lifting assembly arranged on the base and a positioning assembly arranged on the base, wherein the positioning assembly is located between the supporting assembly and the lifting assembly and can move in the vertical direction to support and position the pipe flange of the side pipe, the supporting assembly is used to support the pipe-box flange, and the lifting assembly can move in the vertical direction to adjust the cylinder so that the central axis of the cylinder is in a horizontal state.

[0007] By adopting the above technical solution, when the positioning device for pipe box welding in the present application is used to assist the welding of the pipe, the support assembly and the lifting assembly are first adjusted so that the support assembly and the lifting assembly are adapted to the pipe box to be assembled, and then the pipe box body is placed on the support assembly and the lifting assembly so that the support assembly supports the pipe box flange, and the lifting assembly supports the cylinder, and at this time, the central axis of the cylinder is arranged in parallel to the length direction of the base; then the side pipe is placed on the positioning assembly, and the bolt is threadedly connected to the positioning assembly after passing through the side pipe flange, and then the positioning assembly is driven upward, so that the side pipe moves upward and contacts the position where the side pipe is required to be installed on the cylinder, and finally the side pipe is welded; in this process, the need to pre-weld the process plate on the pipe is avoided, thereby simplifying the assembly and welding steps of the butt pipe, so as to improve the assembly and welding efficiency of the butt pipe, and at the same time avoid the need to use a crane to assist the butt pipe in lifting, so as to avoid the occupation of the crane when the butt pipe is assembled and welded, and also increase the safety when the butt pipe is assembled and welded.

[0008] Furthermore, since the positioning assembly is located between the supporting assembly and the lifting assembly, the supporting position of the lifting assembly on the cylinder can be closer to the end of the cylinder, so as to increase the supporting effect on the pipe box body, thereby increasing the stability of the pipe box body placed on the positioning device, and further increasing the safety of assembling and welding the pipe to the pipe box body.

[0009] Optionally, the base has a transverse support section and a longitudinal support section located at the end of the transverse support section, the support assembly is arranged on the longitudinal support section, and the lifting assembly and the positioning assembly are both arranged on the transverse support section.

[0010] By adopting the above technical solution, since the support assembly is arranged in the longitudinal support section, and the longitudinal support section is arranged at the end of the transverse support section, it is possible to facilitate the placement of the pipe box body in the positioning device, thereby further improving the assembly and welding efficiency of the side pipes.

[0011] Optionally, the support assembly includes relatively arranged support seats, support wheels rotatably connected to the support seats, and a driving structure for driving the two support seats to move toward or away from each other along the width direction of the base, so that the distance between the two support wheels can be changed to be able to contact pipe box flanges of different models.

[0012] By adopting the above technical solution, when adjusting the support assembly, the driving structure is operated to drive the support seat, and the two support seats drive the support wheels to move in the direction of approaching or moving away from each other, so that the distance between the two support wheels can be adapted to the required auxiliary pipe box model; and after the pipe box body is placed on the positioning device, when the pipe box body is adjusted along the direction of its central axis, the support wheel can roll relative to the pipe box flange to reduce the force required when adjusting the pipe box body, thereby improving the adjustment efficiency of the pipe box body and reducing the workload of the staff.

[0013] Optionally, the driving structure includes a transmission shaft, a driving part for driving the transmission shaft to rotate, and a linkage member connecting the transmission shaft and the driving part. The two support seats are threadedly connected to the transmission shaft. When the transmission shaft rotates, the two support seats move in a direction closer to or away from each other.

[0014] By adopting the above technical solution, when adjusting the distance between the two support wheels, the driving part is operated so that the driving part drives the transmission shaft through the linkage, and then the transmission shaft rotates, and the two support seats move in the direction of approaching or moving away from each other to adjust the distance between the two support wheels, thereby improving the adjustment efficiency of the support wheels, and realizing the synchronous movement of the two support wheels to ensure the centering effect of the pipe box body, thereby further reducing the difficulty of assembling and welding the pipe to the pipe box body, and also ensuring the production quality of the pipe box.

[0015] Optionally, the support seat is provided with a mounting portion located on the side of the support wheel, and the mounting portion is threadedly connected with a clamping bolt, and the clamping bolt can be clamped against the outer peripheral surface of the support wheel.

[0016] By adopting the above technical solution, after the position of the pipe box body is adjusted, the tightening bolt is screwed, and then the tightening bolt is tightened against the outer peripheral surface of the support wheel to achieve locking of the support wheel, thereby increasing the stability of the pipe box body placed on the positioning device, so as to further reduce the difficulty of assembling and welding the pipe to the pipe box body, thereby further improving the efficiency of assembling and welding the pipe to the pipe box, and at the same time increasing the position accuracy of assembling the pipe to the pipe box body, so as to further ensure the production quality of the pipe box.

[0017] Optionally, the lifting assembly includes a moving seat, a lifting plate, and a lifting structure arranged on the moving seat and used to drive the lifting plate to move in a vertical direction, the lifting plate is relatively provided with rollers capable of contacting the cylinder, and the moving seat is slidably connected to the base along the length direction of the base.

[0018] By adopting the above technical solution, when adjusting the lifting assembly, the lifting structure is operated, and then the lifting structure drives the lifting plate to move the lifting plate in the vertical direction, so that the roller moves to a position where it can support the cylinder of the pipe box body to achieve the lifting of the lifting assembly; since the movable seat is slidably connected to the base along the length direction of the base, the position of the lifting assembly can be adjusted, so that the lifting assembly can support the cylinders of more models of pipe box bodies, thereby increasing the flexibility of the positioning device.

[0019] Optionally, the lifting structure includes a lifting scissors-fork part, a driving shaft connected to the lifting scissors-fork part, and a power part for driving the driving shaft to rotate, and the lifting scissors-fork part is connected to the movable seat and the lifting plate, and when the driving shaft rotates, the lifting scissors-fork part drives the lifting plate to move in a vertical direction.

[0020] By adopting the above technical solution, when driving the jacking plate, the power unit is operated so that the power unit drives the driving shaft to rotate, and then the power unit drives the jacking scissors part, and the jacking scissors part drives the jacking plate, thereby realizing the movement of the jacking plate in the vertical direction.

[0021] Optionally, the positioning assembly includes a positioning plate, a connecting structure provided on the positioning plate, and a lifting structure provided on the base and used to drive the positioning plate to move in a vertical direction, and the connecting structure is provided for bolt connection of a pipe flange passing through a side pipe.

[0022] By adopting the above technical solution, when assembling the connecting pipe, the connecting pipe is placed on the connecting structure, and then bolts are used to pass through the connecting pipe flange and threadedly connected to the connecting structure, and then the lifting structure is operated to drive the lifting structure to drive the positioning plate, and then the positioning plate drives the connecting structure to move toward the direction close to the cylinder, and the connecting structure drives the connecting pipe to move toward the direction close to the cylinder, and finally the connecting pipe is made to contact the required installation position on the cylinder, thereby completing the support positioning of the connecting pipe to increase the stability of the connecting pipe.

[0023] Optionally, the connection structure includes a first connection plate and a second connection plate, and the first connection plate and the second connection plate are arranged opposite to each other and can move in a direction approaching or moving away from each other in a width direction of the base.

[0024] By adopting the above technical solution, since the first connecting plate and the second connecting plate can move in the direction of approaching or moving away from each other in the width direction of the base, when assembling pipe boxes of different models, the relative positions of the first connecting plate and the second connecting plate can be adjusted so that the connecting pipe flange can be connected to the first connecting plate and the second connecting plate, thereby further increasing the flexibility of the positioning device.

[0025] Optionally, the connecting structure also includes a first rack connected to the first connecting plate, a second rack connected to the second connecting plate, and a gear arranged between the first rack and the second rack, and the gear is meshingly connected to the first rack and the second rack.

[0026] By adopting the above technical solution, when adjusting the position of the first connecting plate and the second connecting plate, the gear is rotated, and then the gear and the first rack and the second rack are caused to rotate relative to each other, so that the first rack drives the first connecting plate to move, and the second rack drives the second connecting plate to move, thereby realizing the synchronous movement of the first connecting plate and the second connecting plate, so as to reduce the difficulty of adjusting the first connecting plate and the second connecting plate, and at the same time, it can also achieve the effect of facilitating the centering of the connecting pipe, so as to ensure the accuracy of the installation position of the connecting pipe and further reduce the difficulty of assembling and welding the connecting pipe.

[0027] Optionally, the positioning plate is provided with a guide rod, and the first connecting plate and the second connecting plate are both provided with a guide block sleeved on the outside of the guide rod.

[0028] By adopting the above technical solution, when the first connecting plate and the second connecting plate are adjusted, the first connecting plate drives the guide block provided on itself to move, and the second connecting plate drives the guide block provided on itself to move, so that the guide block and the guide rod slide relative to each other, so that the sliding cooperation of the guide block and the guide rod guides the movement of the first connecting plate and the second connecting plate, thereby increasing the movement stability of the first connecting plate and the second connecting plate.

[0029] Optionally, the lifting structure includes a lifting scissors-fork part, a rotating shaft connected to the lifting scissors-fork part, and an actuator for driving the rotating shaft to rotate. The lifting scissors-fork part is connected to the positioning plate. When the rotating shaft rotates, the lifting scissors-fork part drives the positioning plate to move in a vertical direction.

[0030] By adopting the above technical solution, when the positioning plate is lifted or lowered, the execution part is operated, and then the execution part drives the rotating shaft, so that the rotating shaft rotates, so that the rotating shaft drives the lifting scissors part, and the lifting scissors part drives the positioning plate, thereby realizing the movement of the lifting scissors plate in the vertical direction.

[0031] Optionally, it also includes a column slidably connected to the base along the length direction of the base, the column is located on the side of the lifting assembly away from the supporting assembly, and the positioning assembly is provided with two groups, one group of the positioning assemblies is arranged on the base, and the other group of the positioning assemblies is arranged on the column and slidably connected to the column along the vertical direction.

[0032] By adopting the above technical solution, when installing the end pipe that needs to be installed on the head, the end pipe is first installed on the positioning assembly provided on the column, and then bolts are used to pass through the pipe flange and threadedly connected to the positioning assembly, and then the position of the positioning assembly is adjusted, so that the positioning assembly drives the end pipe to move, so that the end pipe corresponds to the position installed on the head, and then the column is slid, so that the end pipe is in contact with the position on the head where the end pipe needs to be installed, thereby realizing auxiliary installation of the end pipe, thereby increasing the flexibility of the positioning device and further improving the production efficiency of the pipe box.

[0033] Optionally, the support assembly is provided with support rods that are relatively arranged, and the support rods are provided with limit claws, and the limit claws can move in a vertical direction to be clamped on the pipe box flange.

[0034] By adopting the above technical solution, after the pipe box body is placed on the positioning device, the limiting claw is slid upwards so that the limiting claw is clamped on the pipe box flange, so that the limiting claw limits the pipe box body in the axial direction to avoid the movement of the pipe box body when the column is pushed so that the end pipe hits the head, thereby increasing the stability of the pipe box body.

[0035] The present application also discloses a method for using the positioning device to reduce the difficulty of assembling and welding the butt-tubes and improve the efficiency of assembling and welding the butt-tubes.

[0036] A method for using a positioning device, for using the positioning device, comprises the following steps:

[0037] S1. Adjust the support assembly and the lifting assembly to move the support wheel and the roller to a position that can adapt to the specifications of the pipe box;

[0038] S2. Place the pipe box body, and place the assembled pipe box flange, cylinder and head on the support assembly and the lifting assembly, so that the support wheel contacts the pipe box flange, and the roller contacts the cylinder;

[0039] S3, install the side pipe, place the side pipe on the positioning assembly provided on the base, and use bolts to pass through the pipe flange of the side pipe and then thread it to the positioning assembly;

[0040] S4. Adjust the positioning assembly provided on the base so that the positioning assembly drives the side pipe to move upward and contact the cylinder;

[0041] S5. Install the end pipe, place the end pipe on the positioning assembly provided on the column, and use bolts to pass through the pipe flange of the end pipe and then thread it to the positioning assembly, and adjust the positioning assembly provided on the column so that the end pipe is opposite to the position connected to the head;

[0042] S6. Push the column toward the end cap so that the end pipe contacts the end cap.

[0043] By adopting the above technical solution and the above using method, the difficulty of assembling and welding the connecting pipe to the pipe box body is reduced, so as to improve the efficiency of assembling the connecting pipe to the pipe box body.

[0044] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0045] 1. The positioning device in the present application includes a base, a supporting assembly arranged on the base, a lifting assembly arranged on the base and a positioning assembly arranged on the base. The positioning assembly is located between the supporting assembly and the lifting assembly and can move in the vertical direction to support and position the butt pipe flange. The supporting assembly is used to support the pipe box flange. The lifting assembly can move in the vertical direction to adjust the cylinder so that the central axis of the cylinder is in a horizontal state. Then, when using the positioning device in the present application, the need for pre-welding of process plates on the butt pipe is avoided during the auxiliary installation of the butt pipe, thereby simplifying the assembly and welding steps of the butt pipe to improve the assembly and welding efficiency of the butt pipe, and at the same time avoiding the need to use a crane to assist in lifting the butt pipe, so as to avoid occupying the crane during the assembly and welding of the butt pipe, and also increase the safety during the assembly and welding of the butt pipe.

[0046] 2. The bottom of the present application has a transverse support section and a longitudinal support section at the end of the transverse support section. The support assembly is provided with a longitudinal support section, and the lifting assembly and the positioning assembly are both provided in the transverse support section, thereby facilitating the placement of the pipe box body in the positioning device, so as to further improve the assembly and welding efficiency of the side pipes.

[0047] 3. The support assembly in the present application includes relatively arranged support seats, support wheels rotatably connected to the support seats, and a driving structure for driving the two support seats to move in a direction approaching or moving away from each other along the width direction of the base, so that the distance between the two support wheels can be changed to be able to contact different types of pipe box flanges. When adjusting the support assembly, the driving structure is operated to drive the support seats, and the two support seats drive the support wheels to move in a direction approaching or moving away from each other, so that the distance between the two support wheels can be adapted to the required auxiliary pipe box model; and after the pipe box body is placed on the positioning device, when the pipe box body is adjusted along the direction of its central axis, the support wheels can roll relative to the pipe box flange to reduce the force required when adjusting the pipe box body, thereby improving the adjustment efficiency of the pipe box body and reducing the workload of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0049] Figure 1 This is a structural schematic diagram of welding the auxiliary pipe to the pipe box body at a fixed position according to one implementation mode of the present application;

[0050] Figure 2 This is a schematic diagram of the structure of the positioning device in one embodiment of the present application;

[0051] Figure 3 This is a schematic structural diagram of another viewing angle of the positioning device in one embodiment of the present application;

[0052] Figure 4 This is a schematic structural diagram of the lifting assembly described in one implementation of the present application;

[0053] Figure 5 This is a schematic structural diagram of the positioning assembly described in one embodiment of the present application.

[0054] Reference numerals:

[0055] 1. Base; 2. Support assembly; 21. Support seat; 211. Mounting part; 212. Tightening bolt; 213. Support rod; 214. Limit claw; 215. Adjusting bolt; 22. Support wheel; 23. Driving structure; 231. Transmission shaft; 232. Driving part; 233. Linkage; 3. Lifting assembly; 31. Moving seat; 32. Lifting plate; 321. Roller; 33. Lifting structure; 331. Lifting scissor part; 332. Driving shaft; 333, power unit; 4, positioning assembly; 41, positioning plate; 411, guide rod; 42, connecting structure; 421, first connecting plate; 422, second connecting plate; 423, first rack; 424, second rack; 425, gear; 426, guide block; 43, lifting structure; 431, lifting scissors part; 432, rotating shaft; 433, executive unit; 5, column; 51, adjusting shaft; 511, adjusting handwheel. DETAILED DESCRIPTION

[0056] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0058] In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] In the present application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0061] Reference Figures 1 to 5 , discloses a positioning device for pipe-box welding, which comprises a base 1, a supporting assembly 2 arranged on the base 1, a lifting assembly 3 arranged on the base 1 and a positioning assembly 4 arranged on the base 1, the positioning assembly 4 is located between the supporting assembly 2 and the lifting assembly 3 and can move in the vertical direction to support and position the pipe flange of the side pipe, the supporting assembly 2 is used to support the pipe box flange, and the lifting assembly 3 can move in the vertical direction to adjust the cylinder so that the central axis of the cylinder is in a horizontal state.

[0062] When the positioning device for pipe box welding in the present application is used to assist the welding of the pipe, the support assembly 2 and the lifting assembly 3 are first adjusted so that the support assembly 2 and the lifting assembly 3 are adapted to the pipe box to be assembled, and then the pipe box body is placed on the support assembly 2 and the lifting assembly 3, so that the support assembly 2 supports the pipe box flange, and the lifting assembly 3 supports the cylinder, at which time the central axis of the cylinder is arranged parallel to the length direction of the base 1; then the side pipe is placed on the positioning assembly 4, and the bolt is threadedly connected to the positioning assembly 4 after passing through the side pipe flange, and then the positioning assembly 4 is driven upward, so that the side pipe moves upward and contacts the position where the side pipe on the cylinder is required to be installed, and finally the side pipe is welded; in this process, the need to pre-weld the process plate on the pipe is avoided, thereby simplifying the assembly and welding steps of the butt pipe, so as to improve the assembly and welding efficiency of the butt pipe, and at the same time avoid the need to use a crane to assist the butt pipe in hoisting, so as to avoid the occupation of the crane when the butt pipe is assembled and welded, and also increase the safety when the butt pipe is assembled and welded.

[0063] Furthermore, since the positioning assembly 4 is located between the supporting assembly 2 and the lifting assembly 3, the supporting position of the cylinder by the lifting assembly 3 can be closer to the end of the cylinder, so as to increase the supporting effect on the pipe box body, thereby increasing the stability of the pipe box body placed on the positioning device, and further increasing the safety of assembling and welding the pipe to the pipe box body.

[0064] It should be noted that the pipe box body mentioned in the present application includes a cylinder, a head provided at one end of the cylinder, and a pipe box flange provided at the other end of the cylinder.

[0065] In a preferred embodiment, the base 1 has a transverse support section and a longitudinal support section located at the end of the transverse support section, the support assembly 2 is arranged in the longitudinal support section, and the lifting assembly 3 and the positioning assembly 4 are both arranged in the transverse support section, thereby making the support assembly 2 closer to the side of the base 1, thereby facilitating the placement of the pipe box body on the positioning device, so as to further improve the assembly and welding efficiency of the side pipes.

[0066] The present application does not specifically limit the structure of the support assembly 2. Preferably, refer to Figure 1 , Figure 2 and Figure 3 The support assembly 2 includes support seats 21 arranged opposite to each other, support wheels 22 rotatably connected to the support seats 21, and a driving structure 23 for driving the two support seats 21 to move toward or away from each other along the width direction of the base 1, so that the distance between the two support wheels 22 can be changed to be able to contact pipe box flanges of different models.

[0067] It is understandable that two support seats 21 are provided, and support wheels 22 are rotatably connected to the two support seats 21 , and the rotation axis of the support wheel 22 is arranged parallel to the length direction of the base 1 .

[0068] When adjusting the support assembly 2, operate the driving structure 23 so that the driving structure 23 drives the support seat 21, and the two support seats 21 drive the support wheels 22 to move in the direction of approaching or moving away from each other, so that the distance between the two support wheels 22 can be adapted to the required auxiliary pipe box model; and after placing the pipe box body on the positioning device, when the pipe box body is adjusted along the direction of its central axis, the support wheel 22 can roll relative to the pipe box flange to reduce the force required when adjusting the pipe box body, thereby improving the adjustment efficiency of the pipe box body and reducing the workload of the staff.

[0069] Preferably, the support wheel 22 includes a wheel body rotatably connected to the support seat 21 and a rim extending along the circumference of the wheel body, and the rim is located on the side of the support seat 21 close to the lifting assembly 3, so that the rim can limit the pipe box flange to avoid the pipe box flange contacting the support seat 21, thereby further reducing the force required to rotate the pipe box placed on the positioning device, so as to further achieve the effect of reducing the workload of the staff.

[0070] The present application does not specifically limit the sliding connection mode between the support seat 21 and the base 1. Preferably, the base 1 is provided with a slide rail parallel to its width direction, and a slider is provided at the bottom of the support seat 21. The slider is slidably connected to the slide rail. On the one hand, the sliding connection between the slider and the slide rail guides the support seat 21 to increase the movement stability of the support seat 21, and on the other hand, it can also increase the connection stability between the support seat 21 and the base 1. In other embodiments, the support seat 21 can also be slidably connected to the base 1 through a slider and a slide groove.

[0071] The present application does not specifically limit the structure of the driving structure 23. Preferably, refer to Figure 1 The driving structure 23 includes a transmission shaft 231, a driving part 232 for driving the transmission shaft 231 to rotate, and a linkage member 233 connecting the transmission shaft 231 and the driving part 232. The two support seats 21 are both threadedly connected to the transmission shaft 231. When the transmission shaft 231 rotates, the two support seats 21 move toward or away from each other.

[0072] It can be understood that the driving part 232 is connected to the transmission shaft 231 through the linkage part 233, the length direction of the transmission shaft 231 is set parallel to the width direction of the base 1, and the outer peripheral surface of the transmission shaft 231 is provided with two sections of external threads in opposite directions, and the bottoms of the two support seats 21 are provided with matching blocks, and the two matching blocks are respectively threadedly connected to the two sections of external threads on the outer peripheral surface of the transmission shaft 231, so that when the transmission shaft 231 rotates, the two matching blocks move in the direction of approaching or moving away from each other.

[0073] When adjusting the distance between the two support wheels 22, operate the driving part 232 so that the driving part 232 drives the transmission shaft 231 through the linkage 233, thereby rotating the transmission shaft 231, and the two support seats 21 move in the direction of approaching or moving away from each other to adjust the distance between the two support wheels 22, thereby improving the adjustment efficiency of the support wheels 22, and realizing the synchronous movement of the two support wheels 22 to ensure the centering effect of the pipe box body, thereby further reducing the difficulty of assembling and welding the pipe connection to the pipe box body, and also ensuring the production quality of the pipe box.

[0074] The present application does not specifically limit the structure of the driving part 232 and the linkage member 233. Preferably, refer to Figure 1 The driving part 232 is a driving hand wheel, and the linkage part 233 is a coupling with a bevel gear transmission structure inside. The driving hand wheel is connected to the driving shaft of the coupling, so that when the driving hand wheel is turned, the driving hand wheel drives the coupling, and the coupling drives the transmission shaft 231, and finally the two support seats 21 move toward or away from each other, so as to achieve the effect of reducing the production cost of the positioning device, and at the same time make the use environment of the positioning device no longer rely on the power source. In other implementation examples, the driving part 232 can also be a servo motor, and the linkage part 233 is a coupling that drives and connects the transmission shaft 231 and the output shaft of the servo motor.

[0075] It should be noted that the linkage member 233 may be omitted, that is, the driving portion 232 may be disposed at the end of the transmission shaft 231 to simplify the structure of the driving structure 23 .

[0076] In other embodiments, the driving structure 23 can also be a double-headed cylinder, that is, the two support seats 21 are respectively connected to the two driving ends of the double-headed cylinder; or the driving structure 23 is two groups of cylinders, each group of cylinders drives one support seat 21 respectively; or the driving structure 23 includes a motor and a transmission structure of gears and racks.

[0077] In a preferred embodiment, referring to Figure 2 and Figure 3The support seat 21 is provided with a mounting portion 211 located at the side of the support wheel 22 , and the mounting portion 211 is threadedly connected with a tightening bolt 212 , and the tightening bolt 212 can be tightened against the outer peripheral surface of the support wheel 22 .

[0078] It can be understood that the mounting portion 211 is located on the side of the two supporting wheels 22 that are away from each other, so that the mounting portion 211 and the pipe box body are avoided to ensure the supporting effect of the supporting wheel 22 on the pipe box flange.

[0079] After the position of the pipe box body is adjusted, the tightening bolt 212 is screwed, and then the tightening bolt 212 is pressed against the outer peripheral surface of the support wheel 22 to lock the support wheel 22, thereby increasing the stability of the pipe box body placed on the positioning device, so as to further reduce the difficulty of assembling and welding the pipe to the pipe box body, thereby further improving the efficiency of assembling and welding the pipe to the pipe box, and at the same time increasing the position accuracy of assembling the pipe to the pipe box body, so as to further ensure the production quality of the pipe box.

[0080] The present application does not specifically limit the structure of the mounting portion 211. Preferably, refer to Figure 2 and Figure 3 The mounting portion 211 is a block-shaped structure disposed on the support seat 21 to increase the supporting effect of the mounting portion 211 on the tightening bolt 212, thereby increasing the tightening effect of the tightening bolt 212 on the support wheel 22, thereby further increasing the stability of the pipe box body placed on the positioning device. In other implementation examples, the mounting portion 211 can also be a rod-shaped structure disposed on the support seat 21.

[0081] In other embodiments, the support assembly 2 may further include two support seats 21 arranged opposite to each other, the top of the support seat 21 is provided with a support block for supporting the pipe box flange, and the two support seats 21 are slidably connected to the base 1 along a direction parallel to the width of the base 1.

[0082] The present application does not specifically limit the structure of the lifting assembly 3. Preferably, refer to Figure 2 , Figure 3 and Figure 4 The lifting assembly 3 includes a moving seat 31, a lifting plate 32 and a lifting structure 33 arranged on the moving seat 31 and used to drive the lifting plate 32 to move in the vertical direction. The lifting plate 32 is relatively provided with a roller 321 that can contact the cylinder body. The moving seat 31 is slidably connected to the base 1 along the length direction of the base 1.

[0083] It can be understood that the roller 321 is rotatably connected to the lifting plate 32 to reduce the force required to adjust the pipe box body along its circumferential direction, thereby reducing the workload of the staff.

[0084] When adjusting the lifting assembly 3, operate the lifting structure 33, and then make the lifting structure 33 drive the lifting plate 32 to make the lifting plate 32 move in the vertical direction, so that the roller 321 moves to a position where it can support the cylinder of the pipe box body, so as to realize the lifting and lowering of the lifting assembly 3; since the movable seat 31 is slidably connected to the base 1 along the length direction of the base 1, the position of the lifting assembly 3 can be adjusted, so that the lifting assembly 3 can support the cylinders of more models of pipe box bodies, thereby increasing the flexibility of the positioning device.

[0085] Better, refer to Figure 4 The roller 321 is arranged on the side of the lifting plate 32 so that the roller 321 and the lifting plate 32 form an avoidance relationship to ensure the supporting effect of the roller 321 on the cylinder.

[0086] The present application does not specifically limit the structure of the lifting structure 33. Preferably, refer to Figure 4 The lifting structure 33 includes a lifting scissors-fork portion 331, a driving shaft 332 connected to the lifting scissors-fork portion 331, and a power portion 333 for driving the driving shaft 332 to rotate. The lifting scissors-fork portion 331 is connected to the moving seat 31 and the lifting plate 32. When the driving shaft 332 rotates, the lifting scissors-fork portion 331 drives the lifting plate 32 to move in the vertical direction.

[0087] It can be understood that the lifting scissors-type part 331 includes at least two groups of scissor-type rod groups arranged opposite to each other, and the scissor-type rod groups include a first lifting rod and a second lifting rod. The first lifting rod and the second lifting rod are hinged at the middle position in the length direction so that the first lifting rod and the second lifting rod together form a cross structure, and the bottom end of the first lifting rod is hinged to the moving seat 31, the tops of the first lifting rods of the two groups of scissor-type rod groups are connected by a connecting block, and the top end of the second lifting rod is hinged to the lifting plate 32. The bottom ends of the two groups of second lifting rods are connected by a moving block, and the moving block is slidably connected to the moving seat 31. The driving shaft 332 is rotatably connected to the lifting plate 32 and is threaded through the connecting block, so that when the driving shaft 332 rotates, the connecting block moves along the axial direction of the driving shaft 332, so that the angle between the first lifting rod and the second lifting rod changes, thereby realizing the adjustment of the lifting plate 32 in the vertical direction.

[0088] When the lifting plate 32 is driven, the power unit 333 is operated so that the power unit 333 drives the driving shaft 332 to rotate, and then the power unit 333 drives the lifting scissors part 331, and the lifting scissors part 331 drives the lifting plate 32, thereby realizing the movement of the lifting plate 32 in the vertical direction.

[0089] The present application does not specifically limit the structure of the power unit 333. Preferably, refer to Figure 4The power part 333 is a power hand wheel provided at one end of the driving shaft 332, so that when the power hand wheel is turned, the power hand wheel drives the driving shaft 332 to rotate, so as to manually drive the lifting plate 32 in the vertical direction, thereby reducing the production cost of the positioning device and the use cost of the positioning device, so that the use scenario of the positioning device is not limited by the power source. In other implementation examples, the power part 333 can also be a servo motor or a pneumatic motor whose output shaft is transmission-connected to the driving shaft 332.

[0090] In other embodiments, the lifting structure 33 may also be any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod disposed on the moving seat 31 .

[0091] The present application does not specifically limit the sliding connection method between the moving seat 31 and the base 1. Preferably, the base 1 is provided with a slideway parallel to its length direction, and a sliding block is provided at the bottom of the moving seat 31. The sliding block is slidably connected to the slideway. On the one hand, the sliding cooperation between the sliding block and the slideway guides the movement of the moving seat 31 to increase the stability of the moving seat 31 during movement, and on the other hand, it can also increase the connection stability between the moving seat 31 and the base 1. In other embodiments, the moving seat 31 can also be slidably connected to the base 1 through a sliding block and a slide groove.

[0092] In other embodiments, the lifting assembly 3 may further include a lifting plate 32 and a hydraulic cylinder disposed at the bottom of the lifting plate 32 for driving the lifting plate 32 in a vertical direction, so as to simplify the structure of the lifting assembly 3 .

[0093] The present application does not specifically limit the structure of the positioning component 4. Preferably, refer to Figure 2 , Figure 3 and Figure 5 The positioning assembly 4 includes a positioning plate 41, a connecting structure 42 arranged on the positioning plate 41, and a lifting structure 43 arranged on the base 1 and used to drive the positioning plate 41 to move in the vertical direction. The connecting structure 42 is provided for the bolt connection of the pipe flange passing through the side pipe.

[0094] When assembling the connecting pipe, place the connecting pipe on the connecting structure 42, and then use bolts to pass through the connecting pipe flange of the side connecting pipe and threadedly connect it to the connecting structure 42, and then operate the lifting structure 43 to drive the lifting structure 43 to drive the positioning plate 41, and then the positioning plate 41 drives the connecting structure 42 to move toward the direction close to the cylinder, and the connecting structure 42 drives the connecting pipe to move toward the direction close to the cylinder, and finally the connecting pipe is against the required installation position on the cylinder, thereby completing the support positioning of the connecting pipe to increase the stability of the connecting pipe.

[0095] Preferably, the base 1 is provided with a connecting plate, and the lifting structure 43 is arranged on the connecting plate, so that the connecting plate supports the lifting structure 43.

[0096] It should be noted that the present application does not make any specific limitation on the connection method between the connecting plate and the base 1. It can be slidably connected to the base 1 along the length direction of the base 1 so that the positioning component 4 can move along the length direction of the base 1, thereby increasing the flexibility of the positioning device; it can also be fixedly connected to the base 1.

[0097] The present application does not specifically limit the structure of the connecting structure 42. Preferably, refer to Figure 5 The connection structure 42 includes a first connection plate 421 and a second connection plate 422 . The first connection plate 421 and the second connection plate 422 are arranged opposite to each other and can move in a direction close to or away from each other in the width direction of the base 1 .

[0098] It can be understood that the first connecting plate 421 and the second connecting plate 422 are both provided with a plurality of threaded holes for the threads of bolts that penetrate the connecting flange to penetrate.

[0099] Since the first connecting plate 421 and the second connecting plate 422 can move in the direction of approaching or moving away from each other in the width direction of the base 1, when assembling pipe boxes of different models, the relative positions of the first connecting plate 421 and the second connecting plate 422 can be adjusted so that the connecting pipe flange can be connected to the first connecting plate 421 and the second connecting plate 422, thereby further increasing the flexibility of the positioning device.

[0100] Further, see Figure 5 The connecting structure 42 also includes a first rack 423 connected to the first connecting plate 421, a second rack 424 connected to the second connecting plate 422, and a gear 425 arranged between the first rack 423 and the second rack 424, and the gear 425 is meshed and transmission-connected with the first rack 423 and the second rack 424.

[0101] It can be understood that the first rack 423 and the second rack 424 are respectively located on opposite sides of the gear 425, so that when the gear 425 rotates, the first rack 423 and the second rack 424 move in directions away from each other, that is, when the gear 425 rotates, the first connecting plate 421 and the second connecting plate 422 move in directions closer to or away from each other.

[0102] When adjusting the position of the first connecting plate 421 and the second connecting plate 422, the gear 425 is rotated, and then the gear 425 and the first rack 423 and the second rack 424 are rotated relative to each other, so that the first rack 423 drives the first connecting plate 421 to move, and the second rack 424 drives the second connecting plate 422 to move, thereby realizing the synchronous movement of the first connecting plate 421 and the second connecting plate 422, so as to reduce the difficulty of adjusting the first connecting plate 421 and the second connecting plate 422, and at the same time, it can also achieve the effect of facilitating the centering of the connecting pipe, so as to ensure the accuracy of the installation position of the connecting pipe and further reduce the difficulty of assembling and welding the connecting pipe.

[0103] In order to facilitate the adjustment of the distance between the first connecting plate 421 and the second connecting plate 422, a servo motor for driving the gear 425 to rotate is provided on the positioning plate 41, so as to realize automatic adjustment of the first connecting plate 421 and the second connecting plate 422. Of course, the design of the servo motor can be eliminated, and a driving groove can be provided on the gear 425, so that the staff can use a tool to reach into the driving groove to drive the gear 425.

[0104] Further, see Figure 5 The positioning plate 41 is provided with a guide rod 411 , and the first connecting plate 421 and the second connecting plate 422 are both provided with a guide block 426 sleeved on the outside of the guide rod 411 .

[0105] When the first connecting plate 421 and the second connecting plate 422 are adjusted, the first connecting plate 421 drives the guide block 426 provided on itself to move, and the second connecting plate 422 drives the guide block 426 provided on itself to move, so that the guide block 426 and the guide rod 411 slide relative to each other, so that the sliding cooperation between the guide block 426 and the guide rod 411 guides the movement of the first connecting plate 421 and the second connecting plate 422, thereby increasing the movement stability of the first connecting plate 421 and the second connecting plate 422.

[0106] In other embodiments, the connection structure 42 may further include a plate-like structure, on which a plurality of threaded holes are provided for the threaded passage of bolts that penetrate the connecting flange.

[0107] The present application does not specifically limit the structure of the lifting structure 43. Preferably, refer to Figure 2 The lifting structure 43 includes a lifting scissors-fork portion 431, a rotating shaft 432 connected to the lifting scissors-fork portion 431, and an actuator 433 for driving the rotating shaft 432 to rotate. The lifting scissors-fork portion 431 is connected to the positioning plate 41. When the rotating shaft 432 rotates, the lifting scissors-fork portion 431 drives the positioning plate 41 to move in the vertical direction.

[0108] It is understandable that the structure of the lifting scissors part 431 can refer to the structure of the jacking scissors part 331, and no detailed description is given here.

[0109] When the positioning plate 41 is lifted or lowered, the execution part 433 is operated, and then the execution part 433 drives the rotating shaft 432, so that the rotating shaft 432 rotates, so that the rotating shaft 432 drives the lifting scissors part 431, and the lifting scissors part 431 drives the positioning plate 41, thereby realizing the driving of the positioning plate 41 to move in the vertical direction.

[0110] The present application does not specifically limit the structure of the actuator 433. Preferably, the actuator 433 is an actuator hand wheel disposed at the end of the rotating shaft 432 to manually drive the positioning plate 41 to move in the vertical direction, thereby reducing the production cost of the positioning device and making the positioning device not limited by the use environment. In other implementation examples, the actuator 433 can also be a servo motor, a pneumatic motor, or other structures capable of driving the transmission shaft 231 to rotate, whose output shaft is connected to the rotating shaft 432.

[0111] In other embodiments, the positioning assembly 4 may further include a positioning plate 41 and a hydraulic cylinder, a pneumatic cylinder, an electric push rod or other structure that is disposed at the bottom of the positioning plate 41 and is used to drive the positioning plate 41 to move in the vertical direction, and the positioning plate 41 is provided with a plurality of hole structures for the bolt threads that are inserted into the connecting flange to pass through.

[0112] In a preferred embodiment, referring to Figure 1 , Figure 2 and Figure 3 The positioning device also includes a column 5 slidably connected to the base 1 along the length direction of the base 1, and the column 5 is located on the side of the lifting component 3 away from the supporting component 2. Two groups of positioning components 4 are provided, one group of positioning components 4 is provided on the base 1, and the other group of positioning components 4 is provided on the column 5 and slidably connected to the column 5 along the vertical direction.

[0113] When installing the end pipe that needs to be installed on the head, first install the end pipe on the positioning assembly 4 provided on the column 5, and then use bolts to pass through the pipe flange and threadedly connect to the positioning assembly 4, and then adjust the position of the positioning assembly 4, so that the positioning assembly 4 drives the end pipe to move, so that the end pipe corresponds to the position installed on the head, and then slide the column 5, so that the end pipe is in contact with the position on the head where the end pipe needs to be installed, thereby realizing the auxiliary installation of the end pipe, so as to increase the flexibility of the positioning device and further improve the production efficiency of the pipe box.

[0114] In this embodiment, the positioning assembly 4 can refer to the above embodiment, and the lifting structure 43 can be cancelled, and only the positioning plate 41 and the connecting structure 42 are retained. That is, the positioning plate 41 is connected to the column 5 and is slidably connected to the column 5 along the vertical direction.

[0115] The present application does not specifically limit the sliding connection method between the positioning plate 41 and the column 5. Preferably, the column 5 is provided with a guide rail extending in the vertical direction, and the positioning plate 41 is provided with a guide rail block, which is slidably connected to the guide rail to increase the stability of the positioning plate 41 when it moves in the vertical direction, and also to increase the connection stability between the positioning plate 41 and the column 5. In other embodiments, the positioning plate 41 can also be slidably connected to the column 5 by means of a slider and a slide groove.

[0116] Better, refer to Figure 2 The column 5 is arranged perpendicular to the base 1, and the column 5 is rotatably connected to an adjusting shaft 51 arranged parallel to the length direction of the column 5. The positioning plate 41 is provided with a driven block, and the adjusting shaft 51 is threadedly penetrated through the driven block, so that when the adjusting shaft 51 rotates, the driven block drives the positioning plate 41 to move along the axial direction of the adjusting shaft 51 to realize the adjustment of the position of the positioning plate 41.

[0117] Further, see Figure 2 One end of the adjusting shaft 51 is provided with an adjusting hand wheel 511 located at the top of the column 5, so that the adjusting shaft 51 can be driven to rotate by rotating the adjusting hand wheel 511, thereby realizing the driving of the positioning plate 41 in the vertical direction.

[0118] Of course, a servo motor or a pneumatic motor or the like which is transmission-connected to the adjusting shaft 51 may also be provided on the top of the column 5 to drive the adjusting shaft 51 to rotate.

[0119] In a preferred embodiment, referring to Figure 1 , Figure 2 and Figure 3 The support assembly 2 is provided with support rods 213 which are arranged opposite to each other. The support rods 213 are provided with limit claws 214 which can move in a vertical direction to be clamped on the flange of the pipe box.

[0120] Specifically, two support rods 213 are provided and correspond to two support seats 21 respectively. Each support rod 213 is L-shaped, and the support seat 21 is provided with a connecting pipe for one end of the support rod 213 to pass through.

[0121] After placing the pipe box body on the positioning device, slide the limiting claw 214 upwards to clamp the limiting claw 214 on the pipe box flange, so that the limiting claw 214 limits the pipe box body in the axial direction to avoid the movement of the pipe box body when the column 5 is pushed to make the end pipe contact with the head, so as to increase the stability of the pipe box body.

[0122] Better, refer to Figure 1 , Figure 2 and Figure 3 The limiting claw 214 includes a tubular structure and a claw which are sleeved on the outside of the support rod 213. The tubular structure is threadedly connected with an adjusting bolt 215. The adjusting bolt 215 can be pressed against the support rod 213 to lock the limiting claw 214. At the same time, the limiting claw 214 can be adjusted in the vertical direction to increase the flexibility of the limiting claw 214.

[0123] It should be noted that the positioning device in the present application can not only assist in the assembly of welding pipes, but also assist in the welding of the pipe box body. That is to say, when assembling the pipe box body, the pipe box flange and the head are first spot welded to the two ends of the cylinder, and then the pipe box body is placed on the positioning device, and then the pipe box body is rotated along its circumference, so that the splicing seam of the pipe box body moves along the circumference of the cylinder, so as to achieve the effect of facilitating the staff to continuously weld the splicing seam.

[0124] The present application also discloses a method for using the positioning device to reduce the difficulty of assembling and welding the butt-tubes and improve the efficiency of assembling and welding the butt-tubes.

[0125] A method for using a positioning device, which is used to use the positioning device, comprises the following steps:

[0126] S1. Adjust the support assembly 2 and the lifting assembly 3, turn the driving handwheel so that the driving handwheel drives the transmission shaft 231 to rotate through the linkage 233, and then the two support seats 21 move in the direction of approaching or moving away from each other, so that the two support wheels 22 can adapt to the required auxiliary pipe box body; turn the power handwheel, and then the power handwheel drives the driving shaft 332 to rotate, so that the driving shaft 332 drives the lifting scissors fork part 331, and the lifting scissors fork part 331 drives the lifting plate 32, so that the roller 321 moves to a position that can adapt to the required auxiliary pipe box body, and finally the support wheel 22 and the roller 321 move to a position that can adapt to the specifications of the pipe box.

[0127] S2. Place the pipe box body, and place the assembled pipe box flange, cylinder and head on the support assembly 2 and the lifting assembly 3, so that the support wheel 22 abuts against the pipe box flange, and the roller 321 abuts against the cylinder.

[0128] S3. Install the side pipe and place it on the positioning assembly 4 provided on the base 1, that is, place the side pipe flange on the first connecting plate 421 and the second connecting plate 422, and then use bolts to pass through the pipe flange of the side pipe and threadedly connect it to the first connecting plate 421 and the second connecting plate 422 to fix the side pipe.

[0129] S4. Adjust the positioning assembly 4 provided on the base 1, and adjust the positioning assembly 4 so that the positioning assembly 4 drives the side pipe to move upward and contact with the cylinder, that is, rotate the executing hand wheel, and then the executing hand wheel drives the rotating shaft 432 to rotate, the rotating shaft 432 drives the lifting scissors-type structure, and the lifting scissors-type structure drives the positioning plate 41 upward, so that the positioning plate 41 drives the side structure to move upward and contact with the position of the cylinder where the side pipe needs to be installed.

[0130] S5. Install the end pipe and place it on the positioning assembly 4 provided on the column 5, that is, place the end pipe on the positioning plate 41 provided on the column 5, and use bolts to pass through the pipe flange of the end pipe and threadedly connect it to the first connecting plate 421 and the second connecting plate 422 to fix the end pipe, and then rotate the adjusting shaft 51 so that the positioning plate 41 drives the end pipe to move in the vertical direction, and finally the end pipe is relative to the position where the end pipe needs to be installed on the head.

[0131] S6. Push the column 5 in a direction close to the end cap, so that the end pipe contacts the end cap.

[0132] Due to the use of the above method, the difficulty of assembling and welding the connecting pipe to the pipe box body is reduced, so as to improve the efficiency of assembling the connecting pipe to the pipe box body.

[0133] It should be noted that after placing the pipe box body on the positioning device, it is necessary to use a spirit level to calibrate the pipe box body, so that the central axis of the pipe box body is parallel to the length direction of the base 1 to ensure the horizontality of the pipe box body, increase the accuracy of the pipe installation position, and ensure the production quality of the pipe box.

[0134] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0135] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0136] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A positioning device for pipe box welding, characterized in that: The invention comprises a base (1), a support assembly (2) arranged on the base (1), a lifting assembly (3) arranged on the base (1), and a positioning assembly (4) arranged on the base (1); the positioning assembly (4) is located between the support assembly (2) and the lifting assembly (3) and is capable of moving in a vertical direction to support and position a pipe flange of a side pipe; the support assembly (2) is used to support the pipe box flange; and the lifting assembly (3) is capable of moving in a vertical direction to adjust the cylinder so that the central axis of the cylinder is in a horizontal state; The base (1) has a transverse support section and a longitudinal support section located at the end of the transverse support section, the support assembly (2) is arranged on the longitudinal support section, and the lifting assembly (3) and the positioning assembly (4) are both arranged on the transverse support section; The support assembly (2) comprises support seats (21) arranged opposite to each other, support wheels (22) rotatably connected to the support seats (21), and a driving structure (23) for driving the two support seats (21) to move in a direction approaching or moving away from each other along the width direction of the base (1), so that the distance between the two support wheels (22) can be changed so as to be able to contact pipe box flanges of different models; The support seat (21) is provided with a mounting portion (211) located on the side of the support wheel (22), the mounting portion (211) being threadedly connected with a clamping bolt (212), and the clamping bolt (212) can be clamped against the outer peripheral surface of the support wheel (22); The lifting assembly (3) comprises a moving seat (31), a lifting plate (32), and a lifting structure (33) disposed on the moving seat (31) and used to drive the lifting plate (32) to move in a vertical direction, wherein a roller (321) capable of contacting the cylinder is disposed opposite to the lifting plate (32), and the moving seat (31) is slidably connected to the base (1) along the length direction of the base (1); The positioning assembly (4) comprises a positioning plate (41), a connecting structure (42) provided on the positioning plate (41), and a lifting structure (43) provided on the base (1) and used for driving the positioning plate (41) to move in a vertical direction, wherein the connecting structure (42) is connected to a bolt passing through a pipe flange of a side pipe.

2. A positioning device for pipe box welding according to claim 1, characterized in that: The driving structure (23) comprises a transmission shaft (231), a driving part (232) for driving the transmission shaft (231) to rotate, and a linkage member (233) connecting the transmission shaft (231) and the driving part (232); the two support seats (21) are both threadedly connected to the transmission shaft (231); when the transmission shaft (231) rotates, the two support seats (21) move in a direction of approaching or moving away from each other.

3. A positioning device for pipe box welding according to claim 1, characterized in that: The jacking structure (33) comprises a jacking scissors-fork portion (331), a driving shaft (332) connected to the jacking scissors-fork portion (331), and a power portion (333) for driving the driving shaft (332) to rotate; the jacking scissors-fork portion (331) is connected to the moving seat (31) and the jacking plate (32); when the driving shaft (332) rotates, the jacking scissors-fork portion (331) drives the jacking plate (32) to move in a vertical direction.

4. A positioning device for pipe box welding according to claim 1, characterized in that: The connection structure (42) comprises a first connection plate (421) and a second connection plate (422); the first connection plate (421) and the second connection plate (422) are arranged relative to each other and are capable of moving in a direction approaching or moving away from each other in a width direction of the base (1).

5. A positioning device for pipe box welding according to claim 4, characterized in that: The connection structure (42) further comprises a first rack (423) connected to the first connection plate (421), a second rack (424) connected to the second connection plate (422), and a gear (425) arranged between the first rack (423) and the second rack (424), wherein the gear (425) is meshingly connected to the first rack (423) and the second rack (424); And / or, the positioning plate (41) is provided with a guide rod (411), and the first connecting plate (421) and the second connecting plate (422) are both provided with a guide block (426) sleeved on the outside of the guide rod (411); And / or, the lifting structure (43) comprises a lifting scissors-fork portion (431), a rotating shaft (432) connected to the lifting scissors-fork portion (431), and an actuator (433) for driving the rotating shaft (432) to rotate, wherein the lifting scissors-fork portion (431) is connected to the positioning plate (41), and when the rotating shaft (432) rotates, the lifting scissors-fork portion (431) drives the positioning plate (41) to move in a vertical direction.

6. A positioning device for pipe box welding according to claim 1, characterized in that: It also includes a column (5) slidably connected to the base (1) along the length direction of the base (1), the column (5) being located on a side of the lifting assembly (3) away from the supporting assembly (2), and the positioning assembly (4) is provided in two groups, one group of the positioning assembly (4) being provided on the base (1), and the other group of the positioning assembly (4) being provided on the column (5) and slidably connected to the column (5) along the vertical direction; The support assembly (2) is relatively provided with a support rod (213), the support rod (213) is provided with a limiting claw (214), and the limiting claw (214) can move in a vertical direction to clamp on the pipe box flange.

7. A method for using a positioning device, for using the positioning device as claimed in claim 6, characterized in that: It includes the following steps: S1, adjusting the support assembly (2) and the lifting assembly (3) so that the support wheel (22) and the roller (321) move to a position that can adapt to the specifications of the pipe box; S2, placing the pipe box body, and placing the assembled pipe box flange, cylinder and head on the support assembly (2) and the lifting assembly (3), so that the support wheel (22) contacts the pipe box flange, and the roller (321) contacts the cylinder; S3, installing the side pipe, placing the side pipe on the positioning assembly (4) provided on the base (1), and using bolts to pass through the pipe flange of the side pipe and then threadingly connect it to the positioning assembly (4); S4, adjusting the positioning assembly (4) provided on the base (1) so that the positioning assembly (4) drives the side pipe to move upward and abut against the cylinder; S5, installing the end pipe, placing the end pipe on the positioning assembly (4) provided on the column (5), and using bolts to pass through the pipe flange of the end pipe and then threadedly connect it to the positioning assembly (4), and adjusting the positioning assembly (4) provided on the column (5) so that the end pipe is opposite to the position connected to the head; S6. Push the column (5) toward the end cover so that the end pipe contacts the end cover.

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