CN115740698A

CN115740698A - Plate unit assembling and welding system and method in bridge steel structure

Info

Publication number: CN115740698A
Application number: CN202211602034.9A
Authority: CN
Inventors: 杜磊; 张欣; 尹福源; 赵宏宇; 高志远; 陈泓旭; 崔建涛
Original assignee: Tangshan Kaiyuan Autowelding System Co ltd
Current assignee: Tangshan Kaiyuan Autowelding System Co ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-03-07

Abstract

The invention relates to a plate unit assembling and welding system and a plate unit assembling and welding method in a bridge steel structure, and belongs to the technical field of welding. The technical scheme is as follows: slide (27) in the beam assembly (1) is connected with the mounting seat of the pressing guide device (4), a slide manual locking assembly (3) is arranged on the side of the slide of the beam assembly (1), a slide electric drive assembly (2) is arranged above the slide of the beam assembly (1), and a U-shaped rib assembling and positioning device (5) and a plate type rib assembling and positioning device (6) are arranged on a connecting frame of the pressing guide device (4). The invention has the beneficial effects that: the device has the advantages that the application range is wide, fixed-point assembling and positioning can be carried out on U-shaped rib workpieces, continuous assembling and positioning can be realized on the plate-shaped rib workpieces, the U-shaped rib workpiece assembling and positioning device improves the application range of products and the shape correcting capacity of the workpieces through the rapid replacement of the profiling inserting plate, and the plate-shaped rib assembling and positioning device realizes rapid and accurate positioning and pressing through the pressing wheel which is adjusted continuously.

Description

Plate unit assembling and welding system and method in bridge steel structure

Technical Field

The invention relates to a plate unit assembling and welding system and a welding method in a bridge steel structure, in particular to a welding system and a welding method for assembling and positioning a U-shaped rib workpiece and a plate-shaped rib workpiece with a bottom plate, and belongs to the technical field of welding.

Background

The steel box girder is a very widely applied structure type in the current bridge steel structure, wherein a top plate unit and a bottom plate unit are plate units of the most basic structure of the steel box girder, and the assembly and welding of the plate units are important work in the manufacture of the bridge steel structure. One of the processes of machining the top plate unit and the bottom plate unit is to assemble and position a U-shaped rib workpiece or a plate type rib workpiece and the bottom plate and perform manual spot welding. The traditional processing method comprises the following steps: workers rely on the simple tool to forcibly deform, position and compress workpieces with size deviation, gaps between the U-shaped rib workpieces or the plate type rib workpieces and the bottom plate are eliminated, and then the workpieces are welded and fixed through carbon dioxide arc welding. The processing method has the advantages of inconvenient operation, high labor intensity, low production efficiency and difficult guarantee of processing precision. In order to solve the above problems, two types of U-shaped rib workpiece assembling and positioning devices have been developed by related equipment manufacturers. The continuous assembling and positioning system is matched with a continuous automatic welding function, can keep a pressing and positioning state all the time after a workpiece is shaped from a working starting point and moves along the length direction of the workpiece, and is matched with the automatic welding system to fix a U-shaped rib workpiece and a bottom plate while assembling; however, the workpiece generates large stress in the continuous welding process, which seriously affects the shape-righting and pressing capabilities of the assembly positioning system on the middle section and the tail section of the workpiece, so that the size of the workpiece after assembly welding generally deviates greatly, the operation difficulty of the subsequent process is increased, and the system only provides the method for assembling the U-shaped rib workpiece and the bottom plate, and cannot realize the assembly positioning function of the plate-shaped rib and the bottom plate. The other type is an intermittent assembly positioning system, a workpiece is pressed downwards at a set point position by a profiling tool and is shaped, a gap between a U-shaped rib workpiece and a bottom plate is eliminated, after one point position is assembled and welded, the tool is lifted up to be separated from the workpiece, the workpiece is moved to the next point position by a walking system, the workpiece is continuously pressed downwards, and the assembly positioning work of all the point positions is completed in sequence.

The U-shaped rib workpiece refers to a U-shaped reinforcing rib formed by bending or rolling; and the U-shaped ribs and the bottom plate are welded into a plate unit workpiece. The plate-type rib work refers to: flat reinforcing ribs; and the plate-shaped ribs and the bottom plate are welded into a plate unit workpiece.

Disclosure of Invention

The invention aims to provide a plate unit assembling and welding system and a welding method in a bridge steel structure, which can be used for carrying out fixed-point assembling and positioning on a U-shaped rib workpiece and realizing continuous assembling and positioning on the plate-shaped rib workpiece, the U-shaped rib workpiece assembling and positioning device improves the application range of a product and the shape-righting capability of the workpiece through quickly replacing a profiling inserting plate, the plate-shaped rib assembling and positioning device realizes quick and accurate positioning and pressing through a continuously adjusted pressing wheel, the two functions are not interfered with each other, the switching is convenient, the production efficiency and the processing quality are improved, and the problems in the background technology are solved.

The technical scheme of the invention is as follows:

a welding system and a welding method for assembling a plate unit in a bridge steel structure are disclosed, wherein the plate unit assembling comprises assembling, positioning and spot welding a U-shaped rib workpiece or a plate-shaped rib workpiece and a bottom plate; comprises a beam assembly, a sliding plate electric drive assembly, a sliding plate manual locking assembly, a pressing guide device, a U-shaped rib assembling and positioning device and a plate-shaped rib assembling and positioning device; the sliding plate in the beam assembly is connected with a mounting seat of the pressing guide device, a manual sliding plate locking assembly is arranged on the side of the sliding plate of the beam assembly, an electric sliding plate driving assembly is arranged above the sliding plate of the beam assembly, and the U-shaped rib assembling and positioning device and the plate-shaped rib assembling and positioning device are arranged on a connecting frame of the pressing guide device.

Two ends of a longitudinal plate I and two ends of a longitudinal plate II in the beam assembly are respectively connected with two ends of an upper transverse plate and two ends of a lower transverse plate to form a rectangular guide beam, the longitudinal plate II in the guide beam is connected with the sliding plate through an upper linear guide rail, and the lower transverse plate in the guide beam is connected with the sliding plate through a lower linear guide rail. And a triangular tooth type rack is also arranged on the longitudinal plate II, and the triangular tooth type rack and a tooth type locking block in the manual locking assembly of the sliding plate have the same tooth type structure to form a meshing relationship so as to completely lock and fix the sliding plate and the guide cross beam.

The manual sliding plate locking assembly comprises a fixed guide sleeve, an adjusting screw rod, a gland, a tooth-shaped locking block, a translation shaft and a flat key, wherein the inner wall of the fixed guide sleeve is of a stepped structure, the end with the larger inner diameter is an inner hole of the fixed guide sleeve, the wall of the inner hole is provided with an axially-arranged chute, and the end with the smaller inner diameter of the fixed guide sleeve is a threaded hole; the translational shaft is matched with an inner hole of the fixed guide sleeve, and a flat key is arranged on the translational shaft and slides in the sliding groove; one end of the translation shaft is fixedly connected with a tooth-shaped locking block, the other end of the translation shaft is provided with a central groove and is used for fixing an annular gland, one end of the adjusting screw rod is provided with an annular groove, the end part of the adjusting screw rod penetrates through an inner ring of the gland to enter the central groove of the translation shaft, and the gland is just clamped in the annular groove; the thread of the adjusting screw rod is meshed with the thread of the threaded hole of the fixed guide sleeve; the tooth-shaped locking block is meshed and matched with the triangular tooth-shaped rack. The translational shaft and the translational key are used for limiting the tooth-shaped locking block to rotate along with the adjusting screw rod, and the translational shaft can only translate but cannot rotate. The adjusting screw rod can rotate relative to the translational shaft but cannot move in a translational manner with the translational shaft, and the tooth-shaped locking block is extended and retracted by manually rotating the adjusting screw rod, so that the triangular tooth-shaped rack is locked and loosened.

An upper cross plate in the cross beam assembly is provided with a rack which is meshed with a walking gear in a sliding plate electric drive assembly; the sliding plate electric drive assembly is connected to the sliding plate of the beam assembly through the speed reducer mounting plate, driven by the servo motor, the precision planetary speed reducer is used for transmission, and the output shaft of the precision planetary speed reducer is provided with the walking gear.

The compaction guide device comprises a guide mounting frame, a power system, an integral guide plate, a floating guide plate and a middle guide pressing plate, the guide mounting frame is directly connected with the sliding plate, and the power system is mounted on the guide mounting frame; the power system outputs driving force by a hydraulic oil cylinder, an oil cylinder rod extends out to drive the U-shaped rib assembling and positioning device and the plate-type rib assembling and positioning device to press a workpiece downwards, the oil cylinder rod retracts, and the U-shaped rib assembling and positioning device and the plate-type rib assembling and positioning device lift up to release the workpiece.

The U-shaped rib assembling and positioning device adopts a structural form of a profiling inserting plate; the profiling inserting plate is fixedly arranged at the lower end of a floating guide plate of the pressing guide device through a group of mutually vertical positioning seam allowances I and II, and after the profiling inserting plate is connected with the profiling inserting plate through a jacking bolt, the side face of the floating guide plate is jacked tightly for secondary pre-tightening.

The left floating guide plate and the right floating guide plate are respectively provided with a profiling inserting plate, and the integral guide plate, the swinging plate and the floating guide plates are driven to move by the output driving force of the hydraulic oil cylinder to complete the contact, positioning and pressing of the profiling inserting plates and the U-shaped rib workpiece; the size of the surface of the profiling inserting plate, which is contacted with the U-shaped rib workpiece, is manufactured according to the size of the standard U-shaped rib workpiece on the drawing. When the size of a U-shaped rib workpiece needing to be assembled and positioned is changed, the U-shaped rib assembling and positioning device needs to replace the profiling inserting plate corresponding to the size of the U-shaped rib workpiece.

The plate-type rib assembling and positioning device is connected to an integral guide plate in the pressing guide device through a connecting support and moves along with the up-and-down movement of the integral guide plate; the plate-type rib assembling and positioning device comprises a tool support, an adjustable upper pressing wheel, a fixed side pressing wheel and a movable side pressing wheel; the tool support is connected with the connecting support through a left fixing pin shaft and a right fixing pin shaft, a group of positioning pin holes are respectively formed in the upper side and the lower side of the fixing pin shaft on the connecting support, and the tool support can be fixed at two positions of 0-degree and 180-degree by utilizing two plug-in positioning pins; when the positioning device is assembled by using the plate-shaped ribs, the tool support is arranged at the position of 0 degree, and the positioning pins are inserted into the corresponding positioning pin holes; when the positioning device needs to be assembled by using the U-shaped ribs, the tool support is arranged at a 180-degree position, and the plug-in positioning pins are inserted into the corresponding positioning pin holes; the adjustable upper pinch roller is installed on a group of guide bases I, a trapezoidal lead screw is connected to a middle position of each guide base I, the trapezoidal lead screws are simultaneously fixed on the tool support through lead screw nuts, two sides of each guide base I are respectively connected with one guide shaft I, and the two guide shafts I are respectively fixed on the tool support through two groups of guide shaft sleeves I. The first guide seat can be driven to move along the axis direction of the trapezoidal screw rod by manually rotating the trapezoidal screw rod, and the first guide seat can not horizontally translate or rotate.

A method for assembling and welding a plate unit in a bridge steel structure comprises the steps of carrying out assembling positioning and spot welding on a U-shaped rib workpiece or a plate type rib workpiece and a bottom plate; for a U-shaped rib workpiece, a U-shaped rib assembly positioning device is used for positioning the U-shaped rib workpiece and a bottom plate, a sliding plate electric drive assembly is used for driving a sliding plate of a beam assembly to move, the center line positions of profiling inserting plates on two sides of the U-shaped rib assembly positioning device are overlapped with the center line position of the U-shaped rib workpiece, then a hydraulic oil cylinder in a pressing guide device drives the profiling inserting plates to move downwards until the working surfaces of the profiling inserting plates contact the outer contour surface of the U-shaped rib workpiece, and when the U-shaped rib workpiece is positioned and pressed to meet the required size, the U-shaped rib assembly positioning device is adjusted to perform assembly positioning and spot welding between the U-shaped rib workpiece and the bottom plate; for a plate-type rib workpiece, a plate-type rib assembly positioning device is used for positioning the plate-type rib workpiece and a base plate, firstly, a sliding plate is driven by a sliding plate electric drive assembly to move, a fixed side pressure roller is attached to one side face of the plate-type rib workpiece tightly, then a hydraulic oil cylinder two-action connected with a jacking support is controlled to push a movable side pressure roller to jack the other side face of the plate-type rib workpiece tightly, a hydraulic oil cylinder one-action in a pressing guide device is controlled to drive a tool support and an adjustable upper pressure roller to move downwards, when the stroke of the hydraulic oil cylinder one-action does not meet the working condition, a trapezoidal screw rod on a guide seat one-action is adjusted, the position of the adjustable upper pressure roller is continuously adjusted downwards, and when the adjustable upper pressure roller contacts the plate thickness section of the plate-type rib workpiece, the plate-type rib assembly positioning device is adjusted to perform assembly positioning and spot welding between the plate-type rib workpiece and the base plate.

The invention has the beneficial effects that: the device has the advantages that the application range is wide, fixed-point assembling and positioning can be performed on the U-shaped rib workpiece, continuous assembling and positioning can be realized on the plate-shaped rib workpiece, the U-shaped rib workpiece assembling and positioning device improves the application range of products and the shape correcting capacity of the workpiece through the quick-replacement profiling inserting plate, the plate-shaped rib assembling and positioning device realizes quick and accurate positioning and pressing through the pressing wheel which is adjusted continuously, two functions do not interfere with each other, switching is convenient, and the production efficiency and the processing quality are improved.

Drawings

FIG. 1 is a general schematic diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of a cross-beam assembly according to an embodiment of the present invention;

FIG. 3 is a schematic view of the beam assembly coupled to a sled manual locking assembly according to an embodiment of the present invention;

FIG. 4 is a parameter diagram of a tooth-shaped locking block according to an embodiment of the present invention;

FIG. 5 is a schematic view of a slide manual lock assembly according to an embodiment of the present invention;

FIG. 6 is a schematic view of an electric drive assembly for a sled according to an embodiment of the present invention;

FIG. 7 is a schematic view of a hold down guide according to an embodiment of the present invention;

FIG. 8 is an enlarged view of a portion of a hold-down guide according to an embodiment of the present invention;

FIG. 9 is a schematic bottom view of a positioning device for assembling U-shaped ribs according to an embodiment of the present invention;

FIG. 10 is a schematic view of a positioning device for assembling plate-type ribs according to an embodiment of the present invention;

FIG. 11 is a front view of a panel rib assembly fixture in accordance with an embodiment of the present invention;

FIG. 12 is a bottom view of the positioning device for assembling plate-type ribs according to the embodiment of the present invention;

FIG. 13 is a schematic view of a fixed side platen according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of a movable side pressure roller according to an embodiment of the present invention;

FIG. 15 is a schematic view of a positioning step for assembling a U-shaped rib workpiece according to an embodiment of the present invention;

FIG. 16 is a schematic view of a second step of assembling and positioning a U-shaped rib workpiece according to an embodiment of the present invention;

FIG. 17 is a schematic view of a third step of assembling and positioning a U-shaped rib workpiece according to an embodiment of the present invention;

FIG. 18 is a fourth schematic view illustrating the assembling and positioning steps of the U-shaped rib workpiece according to the embodiment of the present invention;

FIG. 19 is a schematic view of a positioning step for assembling a plate-type rib workpiece according to an embodiment of the present invention;

FIG. 20 is a schematic view of a second step of assembling and positioning the plate-type rib workpiece according to the embodiment of the present invention;

FIG. 21 is a schematic view of a third step of assembling and positioning a plate-type rib workpiece according to an embodiment of the present invention;

FIG. 22 is a fourth schematic view illustrating the assembling and positioning steps of the plate-type rib workpiece according to the embodiment of the present invention;

FIG. 23 is a photograph showing the spot welding effect of the U-shaped rib workpiece after being assembled and positioned according to the embodiment of the present invention;

FIG. 24 is a photograph showing the overall spot welding effect of the U-shaped rib workpiece after being assembled and positioned in accordance with the present invention;

in the figure: the device comprises a beam assembly 1, a sliding plate electric drive assembly 2, a sliding plate manual locking assembly 3, a pressing guide device 4, a U-shaped rib assembling and positioning device 5, a plate type rib assembling and positioning device 6, a bottom plate 7, a U-shaped rib workpiece 8 and a plate type rib workpiece 9; the device comprises a first longitudinal plate 11, a second longitudinal plate 12, a first lower transverse plate 13, a second upper transverse plate 14, an upper linear guide rail 15, a lower linear guide rail 16, a triangular toothed rack 17, a toothed locking block 18, a manual sliding plate locking assembly 19, an adjusting screw 20, a first pointer 21, a fixed guide sleeve 22, a photoelectric sensing switch 23, a rectangular groove sliding sleeve 24, a flat key 25, a gland 26, a sliding plate 27, an annular groove 28, a translation shaft 29, a sliding chute 30, a servo motor 31, a precise planetary reducer 32, a rack 33, a traveling gear 34, a reducer mounting plate 35, a first hydraulic oil cylinder 41, a transition joint 42, an integral guide plate 43, a first pin shaft 44, a swing plate 45, a second pin shaft 46, a guide pressing plate 47, a floating guide plate 48, a middle guide pressing plate 49, a profiling inserting plate 50, a profiling inserting plate bearing 51, a guide mounting frame 52, a first positioning stop 53, a tightening bolt 54, a second positioning stop 55, a connecting bracket 61, a tool bracket 62, a fixed pin 63, a plug-in type positioning pin 64, a first guide shaft 65, a trapezoidal screw 66, a first fixed guide seat shaft sleeve 68, a fixed screw nut 69, a first guide plate nut 70, a second pin shaft bracket 70, a movable pin roller bearing support bracket 78, a second pin support bracket 75, a movable roller bearing support bracket 75, a second pin support bracket 75, a rolling bearing support and a rolling bearing support bracket 75, a rolling bearing support bracket 75.

Detailed Description

The present invention will be further described by way of examples with reference to the accompanying drawings.

A welding system and a welding method for assembling a plate unit in a bridge steel structure are disclosed, wherein the plate unit assembling comprises assembling, positioning and spot welding a U-shaped rib workpiece or a plate-shaped rib workpiece and a bottom plate; comprises a beam assembly 1, a sliding plate electric drive assembly 2, a sliding plate manual locking assembly 3, a pressing guide device 4, a U-shaped rib assembling and positioning device 5 and a plate type rib assembling and positioning device 6; a sliding plate 27 in the beam assembly 1 is connected with a mounting seat of the pressing guide device 4, a sliding plate manual locking assembly 3 is arranged on the side of the sliding plate of the beam assembly 1, and a sliding plate electric drive assembly 2,U type rib assembling and positioning device 5 and a plate type rib assembling and positioning device 6 are arranged on a connecting frame of the pressing guide device 4 above the sliding plate of the beam assembly 1.

Two ends of a first longitudinal plate 11 and a second longitudinal plate 12 in the beam assembly 1 are respectively connected with two ends of an upper transverse plate 14 and a lower transverse plate 13 to form a rectangular guide beam, the second longitudinal plate 12 in the guide beam is connected with a sliding plate 27 through an upper linear guide rail 15, and the lower transverse plate 13 in the guide beam is connected with the sliding plate 27 through a lower linear guide rail 16. And a triangular tooth rack 17 is also arranged on the second longitudinal plate 12, has the same tooth structure as the tooth-shaped locking block 18 in the manual sliding plate locking assembly 3, and forms a meshing relationship to completely lock and fix the sliding plate 27 and the guide cross beam.

Because of the equipment positioner can produce great transverse thrust at the course of the work, rely on the meshing of triangle-shaped tooth to bear, conduct the effort to the direction crossbeam on, prevent that the effort from transmitting the structural unit of relative weaknesses such as slide electric drive subassembly, upper and lower linear guide. The triangular teeth can bear two acting forces in opposite directions after meshing, meshing gaps can be effectively eliminated, positioning accuracy is high, and locking effect is good. Although the tooth-shaped meshing mode is discontinuous adjustment, the maximum positioning deviation can be ensured to be less than 1mm by reducing the tooth-shaped structure through bearing stress analysis, and the use requirement of equipment is met.

The manual sliding plate locking assembly 3 comprises a fixed guide sleeve 22, an adjusting screw rod 20, a gland 26, a tooth-shaped locking block 18, a translational shaft 29 and a flat key, wherein the inner wall of the fixed guide sleeve 22 is of a stepped structure, the end with the larger inner diameter is an inner hole of the fixed guide sleeve 22, the inner hole wall is provided with a sliding groove 30 which is axially arranged, and the end with the smaller inner diameter of the fixed guide sleeve 22 is a threaded hole; the translation shaft 29 is matched with an inner hole of the fixed guide sleeve 22, a flat key 25 is arranged on the translation shaft 29, and the flat key 25 slides in the sliding groove 30; one end of the translational shaft 29 is fixedly connected with the tooth-shaped locking block 18, the other end of the translational shaft 29 is provided with a central groove and fixes the annular gland 26, one end of the adjusting screw rod 20 is provided with the annular groove 28, the end part of the adjusting screw rod 20 penetrates through the inner ring of the gland 26 to enter the central groove of the translational shaft 29, and the gland 26 is just clamped in the annular groove 28; the thread of the adjusting screw rod 20 is meshed with the thread of the threaded hole of the fixed guide sleeve 22; the tooth-shaped locking block 18 is meshed and matched with the triangular tooth-shaped rack 17. The translational shaft 29 and the translational key 25 are used for limiting the tooth-shaped locking block 18 to rotate along with the adjusting screw rod 20, and the translational shaft 29 can only translate but cannot rotate. The adjusting screw rod 20 can rotate relative to the translational shaft but cannot generate translational motion with the translational shaft, and the tooth-shaped locking block 18 is extended and retracted by manually rotating the adjusting screw rod 20, so that the triangular tooth-shaped rack 17 is locked and unlocked.

The upper transverse plate 14 in the beam assembly 1 is provided with a rack 33, and the rack 33 is meshed with a walking gear 34 in the electric driving assembly 2 of the skateboard; the slide plate electric drive assembly 2 is connected to the slide plate 27 of the beam assembly 1 through a speed reducer mounting plate 35, driven by the servo motor 31, the precision planetary speed reducer 32 drives, and the output shaft of the precision planetary speed reducer 32 is provided with a walking gear 34. The sliding plate electric drive assembly 2 can drive the sliding plate 27, the sliding plate manual locking assembly 3, the pressing guide device 4, the U-shaped rib assembling and positioning device 5 and the plate-shaped rib assembling and positioning device 6 to move along the length direction of the cross beam; the servo motor 31 and the precision planetary reducer 32 are combined, can realize precise speed control and position control, and has a position memory function.

The pressing guide device 4 comprises a guide mounting frame 52, a power system, an integral guide plate 43, a floating guide plate 48 and an intermediate guide pressing plate 49, wherein the guide mounting frame 52 is directly connected with the sliding plate 27, and the power system is mounted on the guide mounting frame 52; the power system outputs driving force by a first hydraulic oil cylinder 41, an oil cylinder rod extends out to drive a U-shaped rib assembling and positioning device 5 and a plate-type rib assembling and positioning device 6 to press a workpiece downwards, the oil cylinder rod retracts, and the U-shaped rib assembling and positioning device 5 and the plate-type rib assembling and positioning device 6 are lifted to release the workpiece; different types of workpieces and different driving forces need to be output by the power system.

The integral guide plate 43 is connected with the external thread on the oil cylinder rod of the first hydraulic oil cylinder 41 through the transition joint 42, the integral guide plate 43 slides in a rectangular groove formed between the guide pressure plates 47 at the left side and the right side, and can only move along the axial direction along with the oil cylinder rod of the first hydraulic oil cylinder 41 and cannot translate left and right or rotate; the guide pressing plates 47 on the left side and the right side are fixedly arranged on the guide mounting frame 52; the integral guide plate 43 is connected with an oscillating plate 45 through a first pin shaft 44, the oscillating plate 45 can rotate for a certain angle around the first pin shaft 44 in the movement process, the left side and the right side of the lower side of the oscillating plate 45 are respectively provided with a long round hole, a needle roller bearing 51 is arranged in each long round hole, the needle roller bearings 51 can translate or rotate in each long round hole, and the left group of needle roller bearings and the right group of needle roller bearings are respectively connected with floating guide plates 48 on the left side and the right side through a left pin shaft 46 and a right pin shaft 46; the left and right floating guide plates 48 slide in rectangular grooves formed by the guide pressing plates 47 on the left and right sides and the middle guide pressing plate 49 together, can only move along the axis direction of the hydraulic rod of the hydraulic cylinder I41 along with the integral guide plate 43, and cannot translate or rotate left and right. The middle guide pressure plate 49 is fixedly arranged on the guide mounting frame 52; due to the existence of the long round holes at the two positions of the swing plate 45, the positions of the left and right floating guide plates 48 moving along the axial direction of the hydraulic cylinder rod 41 of the hydraulic cylinder I can be equal in height and can also be staggered by a certain distance, the size of the staggered distance depends on the size of the long round holes and the size of the rotation angle of the swing plate 45, and the staggered distance can adapt to the deviation of unequal heights of the left and right upper planes of the processed U-shaped rib workpiece. The pressing guide plane of the guide pressure plate 47 is in clearance fit with the contact surfaces of the integral guide plate 43 and the floating guide plate 48 and is in a relative sliding state for a long time, so that an oil groove and an oil injection port are machined on the pressing guide plane of the guide pressure plate 47, and regular lubrication is facilitated.

The U-shaped rib assembling and positioning device 5 adopts a structural form of a profiling inserting plate; the profiling inserting plate 50 is fixedly arranged at the lower end of the floating guide plate 48 of the pressing guide device 4 through a group of mutually vertical positioning spigot I53 and positioning spigot II 55, and after the profiling inserting plate 50 is connected through a jacking bolt 54, the side surface of the floating guide plate 48 is jacked tightly for secondary pre-tightening; the installation mode can realize the quick assembly and disassembly of the profiling inserting plate 50, and improve the working efficiency; meanwhile, the section size of the profiling inserting plate 50 is reduced, and the processing cost is reduced.

A profiling inserting plate 50 is respectively arranged on the left floating guide plate 48 and the right floating guide plate 48, and the driving force is output through a hydraulic oil cylinder I41 to drive the integral guide plate 43, the swinging plate 45 and the floating guide plates 48 to move so as to complete the contact, positioning and pressing of the profiling inserting plate 50 and the U-shaped rib workpiece; the size of the surface of the profiling inserting plate 50, which is contacted with the U-shaped rib workpiece, is manufactured according to the size of the standard U-shaped rib workpiece on the drawing, and the contacted surface is ground, processed and quenched, so that the surface hardness is improved.

When the size of the U-shaped rib workpiece needing to be assembled and positioned changes, the U-shaped rib assembling and positioning device 5 needs to replace the profiling inserting plate 50 corresponding to the size of the U-shaped rib workpiece.

Before the U-shaped rib assembling and positioning device 5 starts to work, firstly, the sliding plate 27 of the beam assembly 1 is driven to move by the sliding plate electric drive assembly 2, the central line positions of the profiling inserting plates 50 on the two sides of the U-shaped rib assembling and positioning device 5 are overlapped with the central line position of a U-shaped rib workpiece, then the profiling inserting plates 50 are driven to move downwards by the aid of the hydraulic oil cylinders 41 in the pressing and guiding device 4 until the working surfaces of the profiling inserting plates contact the outer contour surface of the U-shaped rib workpiece, and when the U-shaped rib workpiece is positioned and pressed to meet the required size, the U-shaped rib assembling and positioning device 5 is adjusted.

The plate-type rib assembling and positioning device 6 is connected to the integral guide plate 43 in the pressing guide device 4 through a connecting bracket 61 and moves along with the up-and-down movement of the integral guide plate 43; the plate-type rib assembling and positioning device 6 comprises a tool bracket 62, an adjustable upper pinch roller 70, a fixed side pinch roller 71 and a movable side pinch roller 72; the tool support is connected with the connecting support 61 through a left fixing pin shaft 63 and a right fixing pin shaft 63, a group of positioning pin holes are respectively formed in the upper side and the lower side of the fixing pin shaft 63 on the connecting support 61, and the tool support 62 can be fixed at two positions of 0-degree and 180-degree by utilizing two plug-in positioning pins 64; when the positioning device 6 is assembled by using the plate-shaped ribs, the tool bracket 61 is installed at the position of 0 degree, and the positioning pins are inserted into the corresponding positioning pin holes; when the positioning device needs to be assembled by using the U-shaped ribs, the tool support is arranged at a 180-degree position, and the plug-in positioning pins 64 are inserted into the corresponding positioning pin holes; the adjustable upper pinch roller 70 is installed on a set of guide holder 67, a trapezoidal lead screw 66 is connected to a 67 intermediate position of the guide holder, the trapezoidal lead screw 66 is fixed on the tool support 62 through a lead screw nut 68 simultaneously, a guide shaft 65 is connected to two sides of the guide holder 67 respectively, and the two guide shaft 65 are fixed on the tool support 62 through two sets of guide shaft sleeves 69 respectively. The trapezoidal screw 66 is manually rotated, so that the first guide seat 67 can be driven to move along the axial direction of the trapezoidal screw 66, and the first guide seat 67 cannot horizontally translate or rotate.

A rolling bearing is installed in the inner ring of the adjustable upper pressing wheel 70, the inner ring of the rolling bearing 77 is connected with a supporting pin shaft in a matching mode, two end heads of the supporting pin shaft are respectively fixed in installation holes of the first guide seats 67, and the axis of the adjustable upper pressing wheel 70 is arranged in the horizontal direction; and a second pointer 74 is arranged on the front surface of the first guide seat 67 and is matched with a graduated scale 73 arranged on the tool bracket 62 for use, so that the adjustment position of the adjustable upper pressure wheel 70 can be displayed.

Two groups of fixed side pinch rollers 71 are arranged in the front and back direction along the walking direction during work, a first rolling bearing 77 is respectively arranged on the inner ring of each group of fixed side pinch rollers 71, the inner ring of the first rolling bearing 77 is respectively matched and connected with a first supporting pin shaft 78, and two end heads of the first supporting pin shafts 78 are respectively fixed in mounting holes in the side surface of the tool support 62; the fixed side pinch rollers 71 can only rotate along the axes of the respective support pin shafts I78, and can not perform translation or rotation in other directions.

The movable side pressing wheel 72 is installed on a group of jacking brackets 75, the middle position of each jacking bracket 75 is connected with the rod of a group of hydraulic oil cylinders 76, the hydraulic oil cylinders 76 are fixedly installed on the tool bracket 62, two guide shafts 81 are installed on two sides of each jacking bracket 75 respectively, and the two guide shafts 81 are fixed on the side plate of the tool bracket 62 through two guide shaft sleeves 83 respectively.

Two groups of movable side pressing wheels 72 are arranged in the front and back direction along the walking direction during working and are respectively coplanar with the two groups of fixed side pressing wheels 71, a second rolling bearing 79 is respectively installed on the inner ring of each group of movable side pressing wheels 72, the inner rings of the second rolling bearings 79 are respectively matched and connected with a second supporting pin shaft 80, and two end heads of the second supporting pin shafts 80 are respectively fixed in installation holes of the jacking bracket 75; by controlling the extension and retraction of the second hydraulic cylinder 76, the jacking bracket 75 is driven to move forward and backward, and the distance between the movable side pinch roller 72 and the side bus of the fixed side pinch roller 71 is further adjusted.

Before the plate type rib assembling and positioning device 6 starts to work, firstly, the sliding plate 27 is driven to move by the sliding plate electric drive assembly 2, the fixed side pressing wheel 71 is attached to one side face of a plate type rib workpiece tightly, then the hydraulic oil cylinder II 76 connected with the abutting support 75 is controlled to act to push the movable side pressing wheel 72 to abut against the other side face of the plate type rib workpiece tightly, then the hydraulic oil cylinder I41 in the pressing guide device 4 is controlled to act to drive the tool support 62 and the adjustable upper pressing wheel 70 to move downwards, when the stroke of the hydraulic oil cylinder I41 does not meet the working condition, the trapezoidal screw 66 on the guide seat I67 is adjusted, the position of the adjustable upper pressing wheel 70 is continuously adjusted downwards, and the adjustment of the plate type rib assembling and positioning device 6 is completed until the adjustable upper pressing wheel 70 contacts with the plate thickness section of the plate type rib workpiece.

A method for assembling and welding a plate unit in a bridge steel structure comprises the steps of assembling, positioning and spot welding a U-shaped rib workpiece or a plate-shaped rib workpiece and a bottom plate; for a U-shaped rib workpiece, a U-shaped rib assembling and positioning device 5 is used for positioning the U-shaped rib workpiece and a bottom plate, firstly, a sliding plate electric drive component 2 is utilized to drive a sliding plate 27 of a beam component 1 to move, the center line positions of profiling inserting plates 50 on two sides of the U-shaped rib assembling and positioning device 5 are overlapped with the center line position of the U-shaped rib workpiece, then a hydraulic oil cylinder I41 in a pressing and guiding device 4 is utilized to drive the profiling inserting plates 50 to move downwards until the working surfaces of the profiling inserting plates contact the outer contour surface of the U-shaped rib workpiece, when the U-shaped rib workpiece is positioned and pressed to meet the required size, the U-shaped rib assembling and positioning device 5 is adjusted to complete assembling and positioning between the U-shaped rib workpiece and the bottom plate, and spot welding is carried out; for a plate-type rib workpiece, a plate-type rib assembly positioning device 6 is used for positioning the plate-type rib workpiece and a bottom plate, firstly, a sliding plate electric drive assembly 2 is used for driving a sliding plate 27 to move, a fixed side pressing wheel 71 is attached to one side surface of the plate-type rib workpiece tightly, then, a hydraulic oil cylinder II 76 connected with a pressing support 75 is controlled to act to push a movable side pressing wheel 72 to tightly press the other side surface of the plate-type rib workpiece tightly, a hydraulic oil cylinder I41 in a pressing guide device 4 is controlled to act to drive a tool support 62 and an adjustable upper pressing wheel 70 to move downwards, when the stroke of the hydraulic oil cylinder I41 does not meet the working condition, a trapezoidal screw 66 on a guide seat I67 is adjusted, the position of the adjustable upper pressing wheel 70 is continuously adjusted downwards, and when the adjustable upper pressing wheel 70 contacts the plate thickness section of the plate-type rib workpiece, the plate-type rib assembly positioning device 6 is adjusted to perform assembly positioning and spot welding between the plate-type rib workpiece and the bottom plate.

In the examples, the specific process flow in practical application is as follows:

(1) The assembly positioning process flow of the U-shaped rib workpiece 8 is as follows:

the method comprises the following steps: referring to fig. 15, before the U-shaped rib assembly positioning device 5 is used, the plate-shaped rib assembly positioning device 6 needs to be turned upwards by a certain angle to avoid the working area of the U-shaped rib assembly positioning device 5, and is fixed and locked by a plug-in positioning pin; the bottom plate 7 of the plate unit is hoisted to the platform, and the placing position of the bottom plate 7 in the width direction is positioned by utilizing a limiting device (the prior art) on the platform 7.

Step two: referring to fig. 16, a plurality of U-shaped rib workpieces 8 of the plate unit are sequentially hoisted to corresponding positions on the bottom plate 7 and roughly positioned.

Step three: referring to the attached figure 17, the working position of the machine head of the U-shaped rib assembling and positioning device 5 is adjusted, a profiling inserting plate matched with the size of the U-shaped rib workpiece 8 is installed, the U-shaped rib workpiece 8 is pressed downwards from the starting point in the length direction of the U-shaped rib workpiece 8, the U-shaped rib workpiece 8 with larger external size deviation is shaped, and the U-shaped rib workpiece 8 and the bottom plate 7 are fixed through manual spot welding after being pressed.

Step four: referring to fig. 18, the head of the U-shaped rib assembling and positioning device 5 is lifted up and separated from the U-shaped rib workpiece 8, moves along the length direction of the plate unit to the next position where spot welding needs to be positioned along with the horizontal movement of the beam assembly 1, repeats the action of pressing down another U-shaped rib workpiece 8, and completes the assembling and positioning of all the U-shaped rib workpieces 8 which need to be assembled and positioned in sequence.

Referring to fig. 23 and 24, after the U-shaped rib workpiece 8 and the bottom plate 7 are assembled and positioned by using the invention, a result picture after spot welding is shown as a welding seam forming photo, so that the gap between the U-shaped rib workpiece and the bottom plate is ensured to be less than 0.5mm, and the U-shaped rib workpiece is accurately positioned.

(2) The assembly positioning process flow of the plate-type rib workpiece 9 comprises the following steps:

the method comprises the following steps: referring to fig. 19, before the plate-shaped rib assembling and positioning device 6 is used, the plate-shaped rib assembling and positioning device 6 needs to be turned downwards by a certain angle to a normal working position, and is fixed and locked by a plug-in positioning pin. The bottom plate 7 of the plate unit is hoisted to the platform, and the placing position of the bottom plate in the width direction is positioned by utilizing a limiting device (the prior art) on the platform.

Step two: referring to fig. 20, a plurality of plate-shaped rib workpieces 9 of the plate unit plate are sequentially hoisted to corresponding positions on a bottom plate 7, and both ends of the plate-shaped rib workpieces 9 in the length direction are fixed by manual spot welding; the plate-type rib work 9 is ensured to be kept in a substantially perpendicular state to the bottom plate 7.

Step three: referring to fig. 21, the working position of the machine head of the plate-shaped rib assembling and positioning device 6 is adjusted, the plate-shaped rib assembling and positioning device 6 is moved downward from the starting point in the length direction of the plate-shaped rib workpiece 9, so that the fixed side pressing wheel and the movable side pressing wheel respectively cling to two side surfaces of the plate-shaped rib workpiece 9, the trapezoidal screw is adjusted so that the adjustable upper pressing wheel presses the upper surface of the plate-shaped rib workpiece 9, and the plate-shaped rib workpiece 9 and the bottom plate 7 are fixed by manual spot welding after pressing. The plate type rib assembling and positioning device 6 always keeps positioning and pressing on the plate type rib workpiece 9, moves along the length direction of the plate type rib workpiece 9 along with the horizontal movement of the cross beam assembly 1, and manually spot-welds the plate type rib workpiece 9 and the bottom plate 7 at a fixed position Shi Handian.

Step four: referring to fig. 22, when all the plate-shaped rib workpieces 9 to be assembled and positioned are spot-welded, the movable side pressing wheel of the plate-shaped rib assembling and positioning device 6 retracts to separate from the workpieces, and the machine head of the plate-shaped rib assembling and positioning device 6 is lifted to separate from the plate-shaped rib workpieces 9.

Referring to fig. 4, the parameters of the triangular toothed rack 17 and the toothed locking block 18 are as follows: the pitch A is 2 +/-0.05 mm, the tooth height B is 1.73mm, and the tooth bottom width C is 2mm. The tooth angle is 60 degrees, and the tooth shape is an equilateral triangle. The machining accuracy was 3.2.

Reference is made to figures 7, 8 and 9. The first hydraulic oil cylinder 41 is arranged on the guide mounting frame 52; the oil cylinder rod of the first hydraulic oil cylinder 41 is in driving connection with an integral guide plate 43; the integral guide plate 43 is vertically arranged at the lower part of the guide mounting frame 52, a rectangular channel is formed between the guide pressing plates 47 at the left side and the right side on the guide mounting frame 52, and the integral guide plate 43 slides up and down along the axial direction along with the oil cylinder rod of the hydraulic oil cylinder I41 in the rectangular channel and cannot translate left and right or rotate; the integral guide plate 43 is connected with the swinging plate 45 through a first pin shaft 44, the two floating guide plates 48 are vertically arranged on the left side and the right side below the swinging plate 45, a middle guide pressing plate 49 is arranged between the lower parts of the two floating guide plates 48, the middle guide pressing plate 49 is fixed on the guide mounting frame 52, the floating guide plates 48 on the left side and the right side respectively slide up and down in a rectangular groove formed between the two guide pressing plates 47 and the middle guide pressing plate 49, the bottoms of the floating guide plates 48 on the left side and the right side are respectively provided with respective profiling inserting plates 50, and the profiling inserting plates 50 are fixedly arranged at the lower end of the floating guide plates 48 through a group of mutually vertical positioning spigot I53 and positioning spigot II 55; the shape of the profiling inserting plates 50 is matched with that of the U-shaped rib workpiece, and the left profiling inserting plate 50 and the right profiling inserting plate 50 respectively press two side surfaces of the U-shaped rib workpiece. The installation mode can realize the quick assembly and disassembly of the profiling inserting plate 50, and improve the working efficiency; meanwhile, the section size of the profiling inserting plate 50 is reduced, and the processing cost is reduced.

Claims

1. A plate unit assembling and welding system in a bridge steel structure comprises the steps of assembling, positioning and spot welding a U-shaped rib workpiece or a plate-shaped rib workpiece and a bottom plate; the method is characterized in that: comprises a beam assembly (1), a sliding plate electric drive assembly (2), a sliding plate manual locking assembly (3), a pressing guide device (4), a U-shaped rib assembling and positioning device (5) and a plate-shaped rib assembling and positioning device (6); slide (27) in the beam assembly (1) is connected with a mounting seat of a compression guide device (4), a slide manual locking assembly (3) is arranged on the side of the slide of the beam assembly (1), a slide electric drive assembly (2) is arranged above the slide of the beam assembly (1), and a U-shaped rib assembly positioning device (5) and a plate type rib assembly positioning device (6) are arranged on a connecting frame of the compression guide device (4).

2. The system of claim 1, wherein the system comprises: two ends of a first longitudinal plate (11) and a second longitudinal plate (12) in the beam assembly (1) are respectively connected with two ends of an upper transverse plate (14) and a lower transverse plate (13) to form a rectangular guide beam, the second longitudinal plate (12) in the guide beam is connected with a sliding plate (27) through an upper linear guide rail (15), and the lower transverse plate (13) in the guide beam is connected with the sliding plate (27) through a lower linear guide rail (16); and a triangular tooth type rack (17) is also arranged on the second longitudinal plate (12), and the triangular tooth type rack and a tooth type locking block (18) in the manual sliding plate locking assembly (3) have the same tooth type structure to form a meshing relationship so as to completely lock and fix the sliding plate (27) and the guide cross beam.

3. The system for assembling and welding plate units in a bridge steel structure according to claim 1 or 2, wherein: the manual sliding plate locking assembly (3) comprises a fixed guide sleeve (22), an adjusting screw rod (20), a gland (26), a tooth-shaped locking block (18), a translational shaft (29) and a flat key, wherein the inner wall of the fixed guide sleeve (22) is of a stepped structure, the end with the larger inner diameter is an inner hole of the fixed guide sleeve (22), the inner hole wall is provided with a sliding groove (30) which is axially arranged, and the end with the smaller inner diameter of the fixed guide sleeve (22) is a threaded hole; the translational shaft (29) is matched and installed with an inner hole of the fixed guide sleeve (22), a flat key (25) is arranged on the translational shaft (29), and the flat key (25) slides in the sliding groove (30); one end of the translation shaft (29) is fixedly connected with the tooth-shaped locking block (18), the other end of the translation shaft (29) is provided with a central groove and fixes an annular gland (26), one end of the adjusting screw rod (20) is provided with an annular groove (28), the end part of the adjusting screw rod (20) penetrates through an inner ring of the gland (26) to enter the central groove of the translation shaft (29), and the gland (26) is just clamped in the annular groove (28); the thread of the adjusting screw rod (20) is meshed and connected with the thread of the threaded hole of the fixed guide sleeve (22); the tooth-shaped locking block (18) is meshed and matched with the triangular tooth-shaped rack (17); the translational shaft (29) and the translational key (25) limit the tooth-shaped locking block (18) to rotate along with the adjusting screw rod (20), and the translational shaft (29) can only translate but cannot rotate; the adjusting screw rod (20) can rotate relative to the translational shaft but cannot move in a translational manner, and the tooth-shaped locking block (18) can extend out and retract by manually rotating the adjusting screw rod (20), so that the triangular tooth-shaped rack (17) is locked and released.

4. The system for assembling and welding plate units in a bridge steel structure according to claim 1 or 2, wherein: an upper transverse plate (14) in the transverse beam assembly (1) is provided with a rack (33), and the rack (33) is meshed with a walking gear (34) in a sliding plate electric drive assembly (2); the sliding plate electric drive assembly (2) is connected to a sliding plate (27) of the beam assembly (1) through a speed reducer mounting plate (35) and driven by a servo motor (31), a precision planetary speed reducer (32) is used for transmission, and a walking gear (34) is mounted on an output shaft of the precision planetary speed reducer (32).

5. The system for assembling and welding plate units in a bridge steel structure according to claim 1 or 2, wherein: the pressing guide device (4) comprises a guide mounting frame (52), a power system, an integral guide plate (43), a floating guide plate (48) and a middle guide pressing plate (49), the guide mounting frame (52) is directly connected with the sliding plate (27), and the power system is mounted on the guide mounting frame (52); the power system outputs driving force by a first hydraulic oil cylinder (41), an oil cylinder rod extends out to drive a U-shaped rib assembling and positioning device (5) and a plate-type rib assembling and positioning device (6) to downwards press a workpiece, the oil cylinder rod retracts, and the U-shaped rib assembling and positioning device (5) and the plate-type rib assembling and positioning device (6) are lifted to release the workpiece.

6. A plate unit assembly welding system in a bridge steel structure according to claim 1 or 2, wherein: the U-shaped rib assembling and positioning device (5) adopts a structural form of a profiling inserting plate; the profiling inserting plate (50) is fixedly arranged at the lower end of a floating guide plate (48) of the pressing guide device (4) through a group of mutually vertical positioning spigot I (53) and positioning spigot II (55), and after the profiling inserting plate (50) is connected through a puller bolt (54), the side surface of the floating guide plate (48) is pulled tightly for secondary pre-tightening.

7. The system of claim 6, wherein the plate unit assembling and welding system comprises: the left floating guide plate and the right floating guide plate (48) are respectively provided with a profiling inserting plate (50), and a driving force is output through a hydraulic oil cylinder I (41) to drive the integral guide plate (43), the swinging plate (45) and the floating guide plates (48) to move so as to complete the contact, positioning and pressing of the profiling inserting plates (50) and the U-shaped rib workpiece; the size of the surface of the profiling inserting plate (50) contacted with the U-shaped rib workpiece is manufactured according to the size of the standard U-shaped rib workpiece on the drawing; when the size of a U-shaped rib workpiece needing to be assembled and positioned is changed, the U-shaped rib assembling and positioning device (5) needs to replace the profiling inserting plate (50) corresponding to the size of the U-shaped rib workpiece.

8. The system for assembling and welding plate units in a bridge steel structure according to claim 1 or 2, wherein: the plate-type rib assembling and positioning device (6) is connected to an integral guide plate (43) in the pressing guide device (4) through a connecting bracket (61) and moves along with the up-and-down movement of the integral guide plate (43); the plate-type rib assembling and positioning device (6) comprises a tool support (62), an adjustable upper pressing wheel (70), a fixed side pressing wheel (71) and a movable side pressing wheel (72); the tool support is connected with the connecting support (61) through a left fixing pin shaft (63) and a right fixing pin shaft (63), a group of positioning pin holes are respectively formed in the upper side and the lower side of the fixing pin shaft (63) on the connecting support (61), and the tool support (62) can be fixed at two positions of 0 degree and 180 degrees by utilizing two plug-in positioning pins (64); when the positioning device (6) is assembled by using the plate-shaped ribs, the tool support (61) is arranged at the position of 0 degree, and the positioning pins are inserted into the corresponding positioning pin holes; when the positioning device needs to be assembled by using the U-shaped ribs, the tool support is arranged at a 180-degree position, and the plug-in positioning pins (64) are inserted into the corresponding positioning pin holes; the adjustable upper pressing wheel (70) is installed on a group of first guide seats (67), the middle position of each first guide seat (67) is connected with a trapezoidal lead screw (66), the trapezoidal lead screws (66) are simultaneously fixed on the tool support (62) through lead screw nuts (68), two sides of each first guide seat (67) are respectively connected with a first guide shaft (65), and the two first guide shafts (65) are respectively fixed on the tool support (62) through two groups of first guide shaft sleeves (69); the trapezoidal screw (66) is rotated manually, the first guide seat (67) can be driven to move along the axial direction of the trapezoidal screw (66), and the first guide seat (67) cannot translate or rotate horizontally.

9. A method for assembling and welding a plate unit in a bridge steel structure, which uses the plate unit assembling and welding system of claims 1-8, and is characterized in that: the plate unit assembly comprises the steps of carrying out assembly positioning and spot welding on a U-shaped rib workpiece or a plate-shaped rib workpiece and a bottom plate; for a U-shaped rib workpiece, a U-shaped rib assembly positioning device (5) is used for positioning the U-shaped rib workpiece and a bottom plate, firstly, a sliding plate electric drive assembly (2) is utilized to drive a sliding plate (27) of a beam assembly (1) to move, the center line position of profiling inserting plates (50) on two sides of the U-shaped rib assembly positioning device (5) is overlapped with the center line position of the U-shaped rib workpiece, then a hydraulic oil cylinder I (41) in a pressing guide device (4) is utilized to drive the profiling inserting plates (50) to move downwards until the working surface of the profiling inserting plates contacts the outer contour surface of the U-shaped rib workpiece, when the U-shaped rib workpiece is pressed to meet the required size through positioning, the U-shaped rib assembly positioning device (5) is adjusted, and assembly positioning and spot welding are carried out between the U-shaped rib workpiece and the bottom plate; for a plate-type rib workpiece, a plate-type rib assembly positioning device (6) is used for positioning the plate-type rib workpiece and a bottom plate, a sliding plate electric drive assembly (2) is used for driving a sliding plate (27) to move, a fixed side pressing wheel (71) is attached to one side surface of the plate-type rib workpiece tightly, then a hydraulic oil cylinder II (76) connected with a jacking support (75) is controlled to act to push a movable side pressing wheel (72) to jack the other side surface of the plate-type rib workpiece tightly, a hydraulic oil cylinder I (41) in a pressing guide device (4) is controlled to act to drive a tool support (62) and an adjustable upper pressing wheel (70) to move downwards, when the stroke of the hydraulic oil cylinder I (41) does not meet the working condition, a trapezoidal screw rod (66) on a guide seat I (67) is adjusted, the position of the adjustable upper pressing wheel (70) is continuously adjusted downwards until the adjustable upper pressing wheel (70) contacts the plate thickness section of the plate-type rib workpiece, the plate-type rib assembly positioning device (6) is adjusted, and assembly positioning and spot welding are carried out.