An automatic assembling device for splicing roof box girder of hydraulic support top beam and shield beam

Abstract

The application discloses an automatic assembling device for splicing a roof box girder of a hydraulic support roof beam, comprising a positioning and welding tool and a workpiece conveying device; the positioning and welding tool comprises two rolling support assemblies, four box girder positioning assemblies and a roof positioning and correcting device; the two rolling support assemblies are used for rolling support of a roof assembly; the four box girder positioning assemblies are used for fixing a box girder assembly placed on the roof assembly on the roof assembly; the roof positioning and correcting device comprises two roof positioning assemblies A and two roof positioning assemblies B used for positioning the roof assembly on the two rolling support assemblies, and a roof correcting assembly used for continuously lifting the roof assembly positioned on the two rolling support assemblies to make the roof assembly move in the Z-axis direction, so that the roof assembly is tightly combined with the box girder assembly. The application can realize automatic conveying and positioning and splicing of workpieces, and greatly improves work efficiency and splicing and welding quality of the workpieces.

Description

Technical Field

[0001] This invention relates to the field of hydraulic support manufacturing technology, specifically to an automatic assembly device for assembling the top box girder of the hydraulic support top beam shield beam. Background Technology

[0002] Coal mining enterprises primarily utilize large hydraulic supports as mining equipment. The quality of this equipment directly impacts the production quality and efficiency of the mining industry, and is also directly related to safety throughout the entire production process. Hydraulic supports mainly consist of hydraulic cylinders (columns, jacks), load-bearing structural components (top beams, shield beams, and bases, etc.), pushing devices, control systems, and other auxiliary devices. The top beams and shield beams are assembled and welded from separately formed box girder components and roof plate components.

[0003] The existing assembly technology for top beams and protective beam box assemblies has the following problems: 1. All materials are transported manually by hoisting, which poses personal safety hazards and has low work efficiency.

[0004] 2. The assembly and welding of the workpieces are all done manually, which results in low work efficiency and makes it difficult to guarantee the quality of assembly and welding. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides an automatic assembly device for assembling the top box girder of the hydraulic support top beam shield beam.

[0006] The technical solution adopted in this invention is: An automatic assembly device for assembling the top plate box girder of the hydraulic support top beam shield beam includes: positioning welding fixtures and workpiece conveying device; The positioning welding fixture includes two rolling support assemblies, four box girder positioning assemblies, and a top plate positioning and correction device; Two rolling support components are arranged side by side on a support plane to provide rolling support for the top plate assembly; The four box girder positioning components are fixed in pairs on the outer sides of the two rolling support components to fix the box girder components placed on the top plate components to the top plate components, preventing them from moving in the X, Y, and Z axis directions. The top plate positioning and correction device is set between two rolling support assemblies, including a rectangular base frame, two slide rails A set on the top surface of the rectangular base frame along the X-axis, two top plate positioning assemblies A and two top plate positioning assemblies B respectively fixedly set at the front and rear ends of the rectangular base frame, and a top plate correction assembly that is slidably connected to the two slide rails A by a slider and driven by a motor C to move along the X-axis. The two top plate positioning assemblies A and B are used to position the top plate assembly on the two rolling support assemblies by four liftable cylindrical pins respectively. The top plate correction assembly is used to continuously lift the top plate assembly positioned on the two rolling support assemblies to make it move in the Z-axis direction, thereby making it fit tightly with the box girder assembly. The workpiece conveying device is located in front of the positioning welding fixture and is used to convey the top plate assembly to be assembled onto the two rolling support assemblies of the positioning welding fixture, and to convey the assembled top beam and shield beam box to the designated position.

[0007] Furthermore, the two rolling support components have the same structure, both including a roller bracket extending along the X-axis and two rows of rollers rolling on the top surface of the roller bracket and extending along the Y-axis. Each row of rollers includes one active roller and several passive rollers, which are connected by a chain. The active roller is driven to rotate by a roller motor A.

[0008] Furthermore, the box girder positioning assembly includes a fixed bracket, a slide rail slider assembly A and a lead screw nut assembly A mounted on the side of the fixed bracket along the Z-axis, a lifting frame A fixedly connected to the slider in the slide rail slider assembly A and the nut in the lead screw nut assembly A, a motor A that drives the lead screw in the lead screw nut assembly A to rotate, and a pin assembly fixedly mounted on the upper end of the lifting frame A; the pin assembly includes a pin that engages with a through hole on the side of the box girder assembly, and the pin is driven by motor B to extend and retract along the Y-axis.

[0009] Furthermore, the top plate positioning assembly A and the top plate positioning assembly B have the same structure, both including a fixed plate, a column mounted on the upper side of the fixed plate, a slide rail slider assembly B and a lead screw nut assembly B mounted on the side of the column along the Z-axis direction, a lifting frame B that is fixedly connected to the slider in the slide rail slider assembly B and the nut in the lead screw nut assembly B, a motor D that drives the lead screw in the lead screw nut assembly B to rotate, and a positioning pin assembly fixed on the top surface of the lifting frame B. The positioning pin assembly includes a conical positioning pin that mates with a positioning hole at the bottom of the top plate assembly.

[0010] Furthermore, the locating pin assembly also includes a support disc that is fixedly fitted onto the lower end of the conical locating pin to support the top plate assembly.

[0011] Furthermore, the top plate correction assembly includes a sliding plate with a central opening, a motor C that drives the sliding plate to move along the X-axis, two slide rails B arranged on the upper side of the sliding plate along the Y-axis, four sliders B in pairs that are slidably engaged with the two slide rails B, a push rod assembly A and a push rod assembly B that are fixedly connected to the two sets of sliders B, and a screw drive assembly mounted on the sliding plate for driving the push rod assembly A and the push rod assembly B to move closer or further apart from each other; the push rod assembly A and the push rod assembly B are respectively provided with push rods A and B that can be raised and lowered along the Z-axis.

[0012] Furthermore, the workpiece conveying device includes two track beams arranged along the Y-axis, a moving frame that rolls with the track beams, and two rows of roller assemblies that roll along both sides of the moving frame along the X-axis; each row of roller assemblies includes one active roller and several passive rollers, which are connected by a chain, and the active roller is driven to rotate by a roller motor B.

[0013] Furthermore, the positioning welding fixture also includes a position sensor mounted on the portal frame, which is used to detect the position of the top plate assembly and to stop the rolling support assembly from conveying when the top plate assembly is detected to have reached a set position.

[0014] Furthermore, it also includes a picking robot and a welding robot, wherein the picking robot is used to place the box assembly onto the top plate assembly that has reached a set position, and the welding robot is used to weld the top plate assembly and the box girder assembly that are closely attached together.

[0015] The beneficial effects of this invention are as follows: By setting up a workpiece conveying device and a positioning welding fixture, the workpiece conveying device transports the top plate assembly to be assembled onto two rolling support components of the positioning welding fixture. The rolling support components continue to transport the top plate assembly forward to the splicing position. Four positioning components are used to position the top plate assembly on the two rolling support components, preventing it from moving in the X and Y axes. At this point, a robot can be used to place the box assembly onto the top plate assembly, and then four box beam positioning components are used to fix the box beam assembly onto the top plate assembly. Next, the top plate alignment component moves along the X-axis, lifting the top plate assembly while moving it to ensure it is tightly fitted against the bottom surface of the box beam assembly. Simultaneously, a welding robot performs welding at the fitting area. Through the above process, this invention can achieve automatic workpiece conveying and positioning splicing, greatly improving work efficiency and the quality of workpiece assembly and welding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the automatic assembly device of the present invention.

[0017] Figure 2 This is a schematic diagram of the positioning welding fixture of the present invention.

[0018] Figure 3 This is a structural schematic diagram of the box girder positioning component of the present invention.

[0019] Figure 4 This is a schematic diagram of the top plate positioning and correction device of the present invention.

[0020] Figure 5 This is a structural schematic diagram of the top plate positioning assembly of the present invention.

[0021] Figure 6 This is a schematic diagram of the top plate correction assembly of the present invention.

[0022] Figure 7 This is a schematic diagram of the workpiece conveying device of the present invention. Detailed Implementation

[0023] The present invention will be further illustrated below with specific examples to facilitate understanding of the invention, but this does not limit the invention.

[0024] See Figures 1-7 An automatic assembly device for assembling the top box girder of the hydraulic support top beam shield beam includes: a positioning welding fixture 100 and a workpiece conveying device 200. Preferably, the automatic assembly device may further include a picking robot (not shown in the figure) and a welding robot (not shown in the figure). Both the picking robot and the welding robot are existing technologies. The picking robot is a robot that can rotate 360 ​​degrees and is equipped with a robotic arm. The robotic arm can place the box assembly onto the top plate assembly that has reached the set position. The welding robot can be slidably set on one side of the positioning welding fixture 100 via a slide rail parallel to the positioning welding fixture 100. The top plate correction assembly moves along the X-axis direction and continuously lifts the top plate assembly to make it tightly fit with the bottom surface of the box girder assembly. The welding robot and the top plate correction assembly move synchronously to perform welding at the fitting point.

[0025] The positioning welding fixture 100 includes two rolling support assemblies 110, four box girder positioning assemblies 120, and a top plate positioning and correction device 130. Preferably, the positioning welding fixture 100 also includes a position sensor mounted on the portal frame 140. The position sensor is used to detect the position of the top plate assembly and to stop the rolling support assembly 110 from conveying when the top plate assembly is detected to have reached the set position.

[0026] Two rolling support assemblies 110 are arranged side by side on a support plane for rolling support of the top plate assembly; preferably, the two rolling support assemblies 110 have the same structure, each including a roller bracket 111 extending along the X-axis and two rows of rollers 113 rolling on the top surface of the roller bracket 111 and extending along the Y-axis. Each row of rollers includes a driving roller and several driven rollers. The driving roller and several driven rollers are connected by a chain (not shown in the figure). The driving roller is driven to rotate by a roller motor A (not shown in the figure).

[0027] The roller bracket 111 can be made of structural steel. Two longitudinal beams extending parallel to the X-axis are arranged at the upper end of the roller bracket 111. The two ends of the rollers are rotatably mounted in two bearing seats fixed to the two longitudinal beams via roller shafts. One end of the roller shaft of the active roller extends out of the bearing seat and connects to the active sprocket and the drive sprocket. One end of the roller shaft of all other passive rollers extends out of the bearing seat and connects to the passive sprockets. The active and passive sprockets are connected by a chain. The drive sprocket is connected to the roller motor via a transmission chain and a transmission sprocket. The roller motor drives the active roller to rotate, and the active roller drives all the passive rollers to rotate synchronously via the chain. During forward rotation, the top plate assembly is transported from the workpiece conveying device 200 to the positioning welding fixture 100. During reverse rotation, the assembled top beam and shield beam box are transported from the positioning welding fixture 100 to the workpiece conveying device 200.

[0028] Four box girder positioning assemblies 120 are fixedly mounted in pairs on the outer sides of two rolling support assemblies 110. Each box girder positioning assembly 120 includes a fixed bracket 121, a slide rail slider assembly A122 and a lead screw nut assembly A127 mounted along the Z-axis on the side of the fixed bracket 121, a lifting frame A123 fixedly connected to the slider in the slide rail slider assembly A122 and the nut in the lead screw nut assembly A127, a motor A124 driving the lead screw in the lead screw nut assembly A124 to rotate, and a pin assembly 126 fixedly mounted on the upper end of the lifting frame A123. The pin assembly 126 includes a pin 1261 that engages with a through hole on the side of the box girder assembly. The pin 1261 is driven by a motor B125 to extend and retract along the Y-axis. The slide rail slider assembly A122 and the lead screw nut assembly A127 are existing technologies, and their structure and principle will not be described in detail. The preferred lifting frame A123 is a rectangular shell that slides onto the outside of the lead screw and nut assembly A127. The outer wall of the rectangular shell is fixedly connected to the slider, and the inner wall is fixedly connected to the nut. The pin assembly 126 includes a top plate fixed to the top of the lifting frame A123, a lead screw and nut assembly rotatably connected to the top plate, a sliding plate fixedly connected to the nut of the lead screw and nut assembly, a pin 1261 fixed to the front end of the sliding plate, a motor B125 that drives the lead screw to rotate, a slider fixed to the side of the top plate, and a slide rail that cooperates with the slider and is fixedly connected to the sliding plate. The motor B125 drives the lead screw to rotate forward, and the sliding plate drives the pin 1261 to extend forward and insert into the through hole on the side of the box girder assembly, thereby fixing the box girder assembly to the top plate assembly. After the assembly and welding are completed, the motor B125 drives the lead screw to rotate in the reverse direction, and the sliding plate drives the pin 1261 to retract backward, and the pin 1261 disengages from the box girder assembly.

[0029] The top plate positioning and correction device 130 includes a rectangular base frame 135 disposed between two rolling support components 110, two slide rails A131 disposed on the top surface of the rectangular base frame 135 along the X-axis direction, two top plate positioning components A132 and two top plate positioning components B133 respectively fixedly disposed at the front end and rear end of the rectangular base frame 135, and a top plate correction component 134 slidably connected to the two slide rails A131 by a slider 136 and driven by a motor C to move along the X-axis direction.

[0030] Preferably, the top plate positioning assembly A132 and the top plate positioning assembly B133 adopt essentially the same structure, which simplifies tooling processing and reduces processing costs. Taking the top plate positioning assembly A132 as an example, the top plate positioning assembly A132 includes a fixed plate 1321, a column 1322 mounted on the upper side of the fixed plate 1321, a slide rail slider assembly B1323 and a lead screw nut assembly B1324 mounted on the side of the column 1322 along the Z-axis direction, a lifting frame B1326 fixedly connected to the slider in the slide rail slider assembly B1323 and the nut in the lead screw nut assembly B1324, a motor D1325 that drives the lead screw in the lead screw nut assembly B1324 to rotate, and a positioning pin assembly fixed on the top surface of the lifting frame B1326. Two top plate positioning components A132 are fixed to the front sides of the rectangular base frame 135 via their fixing plates 1321. The fixing plates of the two top plate positioning components B133 are integrally formed with the rectangular base frame 135. The columns of the two top plate positioning components B133 are fixedly passed through the two slide rails A131. The positioning pin assembly includes a conical head positioning pin 1327 that mates with the positioning hole at the bottom of the top plate component, and a support disc 1328 fixedly fitted on the lower end of the conical head positioning pin 1327 for supporting the top plate component. In operation, motor D1325 drives the lead screw to rotate forward, and the nut drives the lifting frame B1326 and the positioning pin assembly to move upward. The conical positioning pin 1327 is inserted into the positioning hole at the bottom of the top plate assembly, and the support disc 1328 abuts against the bottom surface of the top plate assembly, preventing the top plate assembly from moving in the X / Y axis directions. Motor D1325 drives the lead screw to rotate in the reverse direction, and the nut drives the lifting frame B1326 and the positioning pin assembly to move downward. The conical positioning pin 1327 disengages from the top plate assembly. Because the head of the positioning pin is conical, when the positioning pin is inserted into the positioning hole of the top plate assembly, the conical head can act as a guide, thereby compensating for the positional deviation of the top plate assembly.

[0031] The preferred top plate correction assembly 134 includes a sliding plate 1341 with a central opening, a motor C (not shown in the figure) that drives the sliding plate 1341 to move along the X-axis, two slide rails B1342 arranged on the upper side of the sliding plate 1341 along the Y-axis, four sliders B1343 that are slidably engaged with the two slide rails B1342 in pairs, a push rod assembly A and a push rod assembly B that are fixedly connected to the two sets of sliders B, and a screw drive assembly installed on the sliding plate 1341 for driving the push rod assembly A and the push rod assembly B to move closer or further apart from each other; the push rod assembly A and the push rod assembly B are respectively provided with push rods A1344 and B1345 that can be raised and lowered along the Z-axis.

[0032] In practice, motor C is mounted on sliding plate 1341, and the motor output shaft passes vertically upward through sliding plate 1341 and is coaxially fixed to a gear (not shown in the figure). A rack (not shown in the figure) is provided on the inner side of one of the slide rails A131 along its length, and the rack meshes with the gear. Motor C drives the gear to rotate, and the gear meshes with the rack to drive the sliding plate 1341 to slide on slide rail A131, thereby moving the top plate correction assembly 134 along the x-axis.

[0033] The lead screw drive assembly includes a bidirectional lead screw 1346 with a left-hand threaded portion and a right-hand threaded portion, a bidirectional lead screw motor for driving the bidirectional lead screw rotation, and a left-hand nut and a right-hand nut respectively threaded into the left-hand threaded portion and the right-hand threaded portion. The left-hand nut is fixedly connected to the top rod assembly A, and the right-hand nut is fixedly connected to the top rod assembly B. When the bidirectional lead screw motor drives the bidirectional lead screw 1346 to rotate in the forward direction, the top rod assembly A and the top rod assembly B move closer to each other; when the bidirectional lead screw motor drives the bidirectional lead screw to rotate in the reverse direction, the top rod assembly A and the top rod assembly B move further apart, thereby allowing adjustment of the top rod assembly A and the top rod assembly B to adapt to box girder assemblies of different widths.

[0034] Top rod assembly A and top rod assembly B have the same structure, both including a column whose lower end passes through the opening in the middle of the sliding top plate 1341, a slide rail slider assembly and a lead screw nut assembly disposed on the side of the column, a lifting frame fixedly connected to the slider in the slide rail slider assembly and the nut in the lead screw nut assembly, and a top rod motor for driving the lead screw in the lead screw nut assembly to rotate. Top rods A1344 and B1345 are both fixed on the lifting frame. Preferably, the top rod motors of top rod assembly A and top rod assembly B are synchronous motors. The upper ends of top rods A1344 and B1345 are both provided with a frustum to increase the contact area with the top plate assembly.

[0035] The workpiece conveying device 200 includes two track beams 210 arranged along the Y-axis, a movable frame 220 that rolls with the track beams 210, and two rows of roller assemblies 230 that roll along both sides of the movable frame 220 along the X-axis. The structure of the roller assembly 230 is the same as that of the rolling support assembly 110, that is, each row of roller assembly 230 includes one active roller and several passive rollers, which are connected by a chain. The active roller is driven to rotate by a roller motor B. The length of the track beams 210 can be adjusted according to actual needs.

[0036] The working principle of this invention is as follows: 1. The top plate assembly to be assembled, which was completed in the previous process, is conveyed to the two rolling support assemblies 110 of the positioning welding fixture through the workpiece conveying device 100; the rolling support assembly 110 continues to convey the top plate assembly forward. During this process, the position sensor can detect whether the top plate assembly has reached the splicing position. When the top plate assembly is detected to have reached the splicing position, the rolling support assembly 110 stops conveying. 2. The four motors B1325 of the top plate positioning assembly A132 and the top plate positioning assembly B133 start synchronously, drive the lead screw to rotate in the forward direction, and the nut drives the lifting frame B1326 and the positioning pin assembly to move upward. The conical positioning pin 1327 is inserted into the positioning hole at the bottom of the top plate assembly, and the support disc 1328 abuts against the bottom surface of the top plate assembly, so that the top plate assembly cannot move in the X / Y axis direction. 3. At this time, the robot can be used to place the box assembly onto the top plate assembly. The four motors B125 of the four box beam positioning assemblies 120 start synchronously, drive the lead screw to rotate in the forward direction, and the sliding plate drives the pin 1261 to extend forward and insert into the through hole on the side of the box beam assembly, thereby positioning the box beam assembly on the top plate assembly. 4. Start the bidirectional lead screw motor 1347 and adjust the distance between the top rod assembly A and the top rod assembly B; start the top rod motor and motor C. Motor C drives the top plate correction assembly to move along the X-axis, while the top rod motor drives the top rod A1344 and top rod B1345 to rise synchronously, lifting the top plate assembly so that it fits tightly against the bottom surface of the box girder assembly; at the same time, a welding robot is used to perform continuous welding at the fitting area.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also within the protection scope of the present invention.

Claims

1. An automatic assembly device for assembling the top box girder of a hydraulic support top beam shield beam, characterized in that, include: Positioning welding fixture (100) and workpiece conveying device (200); The positioning welding fixture (100) includes two rolling support assemblies (110), four box girder positioning assemblies (120), and a top plate positioning and correction device (130). Two rolling support assemblies (110) are arranged side by side on a support plane for rolling support of the top plate assembly; Four box girder positioning components (120) are fixed in pairs on the outer sides of two rolling support components (110) to fix the box girder components placed on the top plate components to the top plate components and prevent them from moving in the X, Y and Z axis directions. The top plate positioning and correction device (130) is set between two rolling support components (110), including a rectangular bottom frame (135), two slide rails A (131) set on the top surface of the rectangular bottom frame (135) along the X-axis direction, two top plate positioning components A (132) and two top plate positioning components B (133) respectively fixedly set at the front and rear ends of the rectangular bottom frame (135), and a top plate correction component (134) slidably connected to the two slide rails A (131) by a slider (136) and driven by a motor C to move along the X-axis direction; the two top plate positioning components A (132) and the two top plate positioning components B (133) are used to position the top plate component on the two rolling support components (110) respectively by four liftable cylindrical pins, and the top plate correction component (134) is used to continuously lift the top plate component positioned on the two rolling support components (110) to make it move in the Z-axis direction, so as to fit tightly with the box girder component; The workpiece conveying device (200) is located on the front side of the positioning welding fixture (100) and is used to convey the top plate assembly to be assembled to the two rolling support assemblies (110) of the positioning welding fixture, and to convey the assembled top beam and shield beam box to the designated position.

2. The automatic assembly device according to claim 1, characterized in that, The two rolling support assemblies (110) have the same structure. They both include a roller bracket (111) extending along the X-axis and two rows of rollers rolling on the top surface of the roller bracket (111) and extending along the Y-axis. Each row of rollers includes a driving roller and several passive rollers. The driving roller and several passive rollers are connected by a chain. The driving roller is driven to rotate by a roller motor A.

3. The automatic assembly device according to claim 1, characterized in that, The box girder positioning assembly (120) includes a fixed bracket (121), a slide rail slider assembly A (122) and a lead screw nut assembly A (127) mounted on the side of the fixed bracket (121) along the Z-axis, a lifting frame A (123) fixedly connected to the slider in the slide rail slider assembly A (122) and the nut in the lead screw nut assembly A, a motor A (124) for driving the lead screw in the lead screw nut assembly A to rotate, and a pin assembly (126) fixedly mounted on the upper end of the lifting frame A (123); the pin assembly (126) includes a pin (1261) that engages with the through hole on the side of the box girder assembly, and the pin (1261) is driven by motor B (125) to extend and retract along the Y-axis.

4. The automatic assembly device according to claim 1, characterized in that, The top plate positioning assembly A (132) and the top plate positioning assembly B (133) have the same structure. Both include a fixed plate (1321), a column (1322) installed on the upper side of the fixed plate (1321), a slide rail slider assembly B (1323) and a lead screw nut assembly B (1324) installed on the side of the column (1322) along the Z-axis direction, a lifting frame B (1326) that is fixedly connected to the slider in the slide rail slider assembly B (1323) and the nut in the lead screw nut assembly B (1324), a motor D (1325) that drives the lead screw in the lead screw nut assembly B to rotate, and a positioning pin assembly fixed on the top surface of the lifting frame B (1326). The positioning pin assembly includes a conical head positioning pin (1327) that mates with the positioning hole at the bottom of the top plate assembly.

5. The automatic assembly device according to claim 4, characterized in that, The locating pin assembly also includes a support disc (1328) that is fixedly fitted at the lower end of the conical locating pin (1327) to support the top plate assembly.

6. The automatic assembly device according to claim 1, characterized in that, The top plate correction assembly (134) includes a sliding plate (1341) with a central opening, a motor C that drives the sliding plate (1341) to move along the X-axis, two slide rails B (1342) set on the upper side of the sliding plate (1341) along the Y-axis, four sliders B (1343) that are slidably engaged with the two slide rails B (1342) in pairs, a top rod assembly A and a top rod assembly B that are fixedly connected to the two sets of sliders B, and a screw drive assembly installed on the sliding plate (1341) for driving the top rod assembly A and the top rod assembly B to move closer or further away from each other; the top rod assembly A and the top rod assembly B are respectively provided with a top rod A (1344) and a top rod B (1345) that can be raised and lowered along the Z-axis.

7. The automatic assembly device according to claim 1, characterized in that, The workpiece conveying device (200) includes two track beams (210) arranged along the Y-axis, a movable frame (220) that rolls with the track beams (210), and two rows of roller assemblies (230) that roll along the X-axis on both sides of the movable frame (220). Each row of roller assemblies (230) includes one active roller and several passive rollers. The active roller and several passive rollers are connected by a chain. The active roller is driven to rotate by a roller motor B.

8. The automatic assembly device according to claim 1, characterized in that, The positioning welding fixture (100) also includes a position sensor mounted on the portal frame (140), which is used to detect the position of the top plate assembly and to stop the conveying of the rolling support assembly (110) when the top plate assembly is detected to have reached a set position.

9. The automatic assembly device according to claim 6, characterized in that, It also includes a picking robot and a welding robot. The picking robot is used to place the box girder assembly onto the top plate assembly that has reached a set position, and the welding robot is used to weld the top plate assembly and the box girder assembly that are closely attached to each other.

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