Steel net rack ball node positioning device and using method thereof

Abstract

The application discloses a steel net rack ball node positioning device and a use method thereof, and belongs to the technical field of steel net rack ball node positioning devices.The steel net rack ball node positioning device comprises a positioning track, a positioning box, a conveying arm, a fixing support and a laser emitter.The positioning track is provided with a fixing hole, and both ends of the positioning track are respectively provided with a positioning groove and a positioning block.The positioning box moves on the positioning track through traveling rollers, the conveying arm is symmetrically welded on both sides of the positioning box, the ball clamp and the fixing support are used for fixing the ball node to be positioned, and the laser emitter is installed at the center of the bottom surface of the box body and the supporting platform.The application realizes accurate positioning of the ball node through the positioning track with distance scales and the laser emitter, and the ball node is stably supported by using the fixing support.The device is fast to install on site and is simple to use.The use method combines the actual situation on site, and simplifies the process of positioning and step-by-step welding of workers one by one.

Description

Technical Field

[0001] This invention relates to the field of steel space frame lifting technology, and in particular to a steel space frame ball node positioning device and its usage method. Background Technology

[0002] A steel space frame structure is a highly statically indeterminate spatial structure composed of numerous members and ball joints at the ends, arranged systematically from two or more directions. Due to the mutual support between the members, it alters the force-bearing system of a planar truss, enabling it to withstand loads from all directions. It exhibits high stiffness, good integrity, and strong seismic resistance. The basic units constituting a steel space frame include triangular pyramids, triangular prisms, cubes, and truncated square pyramids.

[0003] The accurate layout and positioning of ball joints are a prerequisite for the formation of a steel space frame structure. Due to the special structure of ball joints and the inaccuracy of manual positioning, there are errors in the positioning of ball joints on site. This often leads to difficulties in accurately positioning connecting members, resulting in the application of prestress that is detrimental to the entire space frame structure. In addition, due to the large overall structural volume, the efficiency of the positioning work of the upper and lower chord ball joints also becomes a major factor affecting the construction progress.

[0004] In summary, effectively solving the technical problems of large positioning errors and low operational efficiency in steel space frame spherical nodes is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention

[0005] Objective: To achieve accurate and rapid positioning of ball nodes during the ground installation phase of steel space frames on construction sites. To this end, a ball node positioning device for steel space frames and its usage method are proposed to achieve more accurate and efficient positioning of ball nodes in steel space frames.

[0006] Technical solution: To achieve the above objectives, the technical solution adopted by this invention is as follows:

[0007] A steel grid ball node positioning device includes a positioning track, a positioning box, a conveying arm, a fixed bracket, and a laser emitter. The positioning box runs on the upper part of the positioning track, and the conveying arms are provided on the left and right sides of the positioning box. The laser emitter is installed on the lower surface of the positioning box and the fixed bracket.

[0008] The positioning track is an I-shaped steel component with a slot at one end and a protrusion at the other end. It has fixing holes, positioning grooves, and positioning blocks. The fixing holes are equidistantly spaced on the surface of the positioning track, with a depth equal to the height of the track. A positioning groove is located at one longitudinal end of the positioning track, and a positioning block is located at the other end. The width of the positioning groove is the same as the width of the positioning block. Distance graduations are also marked on the outer surface of the positioning track.

[0009] The positioning box includes a box body, a ball clamp, a lifting cylinder, ball partitions, and traveling rollers. The box body is a box-shaped structure with two protruding limbs at the bottom and a rectangular box body at the top. The left and right sides of the box body have symmetrical spherical openings, and the top has a rectangular opening. The rear side of the box body has a movable groove, and the front side of the box body has a rectangular space. Ball partitions are set on both sides of this space, and a ball clamp is set in the middle. Several traveling rollers are symmetrically arranged at the junction of the two protruding limbs at the bottom of the box body and the positioning track. A laser emitter is set at the bottom of the box body, and its axis is collinear with that of the lifting cylinder.

[0010] The ball clamp is a C-shaped steel component with a horizontally extending end structure and threaded holes. Threaded holes are also present at corresponding positions at the upper and lower ends. The width of the movable groove is the same as the thickness of the ball clamp. The lifting cylinder is a hydraulic mechanism with a rectangular plate on top, which is welded to the lower clamp of the ball clamp. The ball partition is an L-shaped component with a certain slope at the lower end. A sealing door is also provided on the front side of the box, with a handle at the end of the sealing door. A second sliding groove is provided at the contact point between the sealing door and the box. The traveling rollers rotate around a roller shaft of a J-shaped component.

[0011] The conveying arm includes a conveying pipe, a hinge, and a limiting box. The conveying pipe is symmetrically welded to both ends of the box body. The conveying pipe is a cuboid box with an internally excavated circular groove. The diameter of the circular groove is the same as the diameter of the spherical openings on the left and right sides of the box body. The position of the circular groove is aligned with the spherical openings on the left and right sides of the box body. A hinge is provided at the end of the conveying pipe. Two first sliding grooves are symmetrically arranged on the hinge. The limiting box is a cuboid box with a semi-circular groove on its inner side. The radius of the semi-circular groove is the same as the radius of the spherical openings on the left and right sides of the box body. The limiting box slides in the first sliding groove through a first limiting block provided on its rear side. The upper and lower ends of the limiting box are symmetrically provided with connecting holes. When the first limiting block moves to the end of the first sliding groove, the distance between the limiting box and the other symmetrically arranged limiting box is the width of the ball clamp.

[0012] The fixed bracket includes a support platform, a first leg, a second leg, and a base. The support platform is a hexagonal steel component with a connecting screw head at the center of the top and a laser emitter at the center of the bottom. The support platform is rotatably connected to six first legs on its sides. The first legs are steel plates with a groove in the middle and evenly spaced positioning holes on the surface. The second legs are steel plates with a width and thickness smaller than the groove width and thickness of the first legs. The second legs have a positioning hole at one end and are rotatably connected to the base at the other end. The base is a semi-cylinder with a hole in the middle.

[0013] A method for using a steel space frame ball node positioning device includes the following steps:

[0014] S1: Based on the on-site layout and positioning results and the actual dimensions of the site, select several positioning tracks and lay them symmetrically on the ground. Connect them to the positioning blocks through the positioning grooves at their ends. When laying, fix the positioning tracks to the ground with bolts according to the fixing holes.

[0015] S2: Push the positioning box into the laid positioning track through the bottom travel rollers. According to the distance scale shown on the track and the on-site layout positioning results, continue to push the positioning box to the position where the lower chord ball is placed to complete the coarse positioning of the ball node.

[0016] S3: Pull the limit box to the end of the first sliding groove, and rotate the hinge to align the left and right limit boxes. Use bolts to pass through the connecting holes to connect the two limit boxes; open the sealing door, put two lower chord ball nodes into the ball partition, and close the sealing door.

[0017] S4: After the ball node placed on the ball partition rolls into the limit box due to the slope, put the ball clamp into the gap of the limit box. Use bolts to pass through the screw holes at the end and top of the ball clamp to clamp and fix the two lower chord ball nodes that have slid down from the ball partition. Screw the fixing bracket into the lower screw hole of the ball clamp through the connecting screw head at the top. Turn on the laser emitter and complete the precise positioning of the lower chord ball node according to the laser point and the on-site laying result. When the lower chord ball node is determined to have moved to the correct laying position, rotate the six first legs to the same angle, pull out each second leg to the ground contact length, rotate the base until the bottom surface touches the ground, and fix the second leg to the first leg by passing the pin through the positioning hole.

[0018] S5: Remove the bolts passing through the connecting holes, slide the positioning box to the other end of the first sliding groove, fold the hinge, and turn the hinge to a direction parallel to the outer side of the conveying pipe. Repeat this cycle to complete the positioning of all lower chord ball joints in one stroke, and simultaneously perform the welding of the horizontal members of the lower chord ball joints parallel to the direction of travel.

[0019] S6: After the last pair of lower chord ball nodes are positioned, open the sealing door, place an upper chord ball node into the ball clamp, and clamp the ball clamp with bolts through the screw holes at the rear end of the ball clamp. Close the sealing door, open the laser emitter located at the bottom of the box, and push the positioning box in the opposite direction to the starting point. Based on the laser point and the on-site layout results, complete the precise positioning of the upper chord ball node. Drive the lifting cylinder to lift the upper chord ball node to the design elevation, and perform the welding work of the oblique rods between the upper and lower chord balls, as well as the welding work of the horizontal rods parallel to the direction of travel between adjacent upper chord ball nodes. After the welding is completed, drive the lifting cylinder to retract into the box and continue to push the positioning box. At this time, the welding work of the horizontal rods of the lower chord ball perpendicular to the direction of travel is completed. Repeat this cycle to complete the positioning and welding work of all ball nodes in one stroke.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] Compared with the original technology, the present invention can achieve coarse and fine positioning of ball nodes through the distance scale on the positioning track and the laser emitter installed on the lower surface of the positioning box and the fixed bracket, thereby improving the accuracy of the space frame positioning and assembly work; the use of positioning track and traveling rollers and other devices improves the flexibility of the mechanism, and the construction process of ball positioning and rod welding is reasonably arranged, thereby improving work efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall device of the steel grid ball node positioning device of the present invention;

[0023] Figure 2 This is a schematic diagram of the positioning track structure of the steel grid ball node positioning device of the present invention;

[0024] Figure 3 This is a schematic diagram of the positioning box structure of the steel grid ball node positioning device of the present invention;

[0025] Figure 4 This is a schematic diagram of the conveyor arm structure of the steel grid ball node positioning device of the present invention;

[0026] Figure 5 This is a schematic diagram of the conveying arm of the steel grid ball node positioning device of the present invention, wherein (a) is a rear view and (b) is a cross-sectional view;

[0027] Figure 6 This is a schematic diagram of the fixed support structure of the steel grid ball node positioning device of the present invention;

[0028] Figure 7 This is a bottom view of the positioning box of the steel grid ball node positioning device of the present invention;

[0029] Figure 8 This is a bottom view of the fixed support of the steel grid ball node positioning device of the present invention;

[0030] Figure 9 This is a schematic diagram of the first leg, the second leg, and the base structure of the steel grid ball node positioning device of the present invention;

[0031] Figure 10 This is a front view of the traveling roller and roller shaft of the steel grid ball node positioning device of the present invention.

[0032] In the diagram: 1 is the positioning track, 2 is the positioning box, 3 is the conveying arm, 4 is the fixed bracket, 5 is the laser emitter, 11 is the fixing hole, 12 is the positioning groove, 13 is the positioning block, 21 is the box body, 22 is the ball clamp, 23 is the lifting cylinder, 24 is the ball partition, 25 is the traveling roller, 31 is the conveying pipe, 32 is the hinge, 33 is the limit box, 41 is the support platform, 42 is the first leg, 43 is the second leg, 44 is the base, 211 is the movable groove, 212 is the sealing door, 213 is the connecting hole, 251 is the roller shaft, 321 is the first sliding groove, 331 is the connecting hole, 332 is the first limit block, 411 is the connecting screw, 421 is the positioning hole, 2121 is the second sliding groove, and 2122 is the handle. Implementation

[0033] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the invention. After reading this invention, any modifications of the invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0034] A steel space frame ball node positioning device, such as Figure 1 As shown, it includes a positioning track 1, a positioning box 2, conveying arms 3, a fixed bracket 4, and a laser emitter 5. The positioning box 2 moves on the positioning track 1 by installing positioning rollers 25 at the bottom of the positioning box 2. The two conveying arms 3 are welded to the left and right sides of the positioning box 2. The laser emitter 5 is installed on the lower surface of the positioning box 2 and the fixed bracket 4.

[0035] like Figure 2 As shown, the positioning track 1 is an I-shaped steel component with a slot at one end and a protrusion at the other end, including fixing holes 11, positioning grooves 12, and positioning blocks 13. The fixing holes 11 are equidistantly located on the surface of the positioning track 1, and the depth of the holes is the same as the height of the positioning track 1. When installing the positioning track 1, bolts are used to pass through the fixing holes 11 to fix the positioning track 1 to the ground. The positioning track 1 has a positioning groove 12 at one end and a positioning block 13 at the other end. The width of the positioning groove 12 is the same as the width of the positioning block 11. When installing the positioning track, the positioning block 13 of the previous positioning track 1 is installed into the positioning groove 12 of the next positioning track 1 to achieve the overall splicing of the track. The outer surface of the positioning track 1 is also marked with distance scales. The distance scales are used for coarse positioning of the ball node positioning device of the steel grid frame. After the positioning box 2 is pushed onto the positioning track 1, the coarse positioning of the ball node can be determined according to the intersection of the edge line of the positioning box 2 and the distance scales during its movement.

[0036] like Figure 3 , Figure 6 , Figure 10As shown, the positioning box 2 includes a box body 21, a ball clamp 22, a lifting cylinder 23, a ball partition 24, and traveling rollers 25. The box body 21 has two protruding legs at the bottom and a rectangular box-shaped structure at the top. Spherical openings are symmetrically arranged on the left and right sides of the box body 21, and a rectangular opening is opened at the top. A movable groove 211 is provided on the rear side. A rectangular space with the same width as the box body 21 is opened at the front side of the box body 21. Ball partitions 24 are arranged on both sides of this space, and the ball clamp 22 is arranged in the middle. The ball clamp 22 is welded to a rectangular plate at its lower part. The lifting cylinder 23 is a hydraulic mechanism with a rectangular plate at the top. The upper part of this rectangular plate is welded to the lower part of the ball clamp 22. The vertical movement of the ball clamp 22 is achieved by the oil supply and return of the lifting cylinder 23. The width of the movable groove 211 is the same as the thickness of the ball clamp 22, facilitating the movement of the ball clamp 22 within it. Several traveling rollers 25 are symmetrically arranged at the junction of the two protruding limbs at the lower part of the housing 21 and the positioning track 1. Each traveling roller 25 includes a J-shaped roller shaft 251. The top of the roller shaft 251 is welded into the groove of the two protruding limbs at the lower part of the housing 21, and the bent part fixes the traveling roller 25. A laser emitter 5 is provided at the bottom of the housing 21. It is aligned with the axis of the lifting cylinder 23 and the center of the bolt hole at the lower end of the ball clamp 22. When the laser emitter 5 is turned on, the ball node is precisely positioned according to the laser point on the ground.

[0037] like Figure 3 , Figure 6 As shown, the ball clamp 22 is a C-shaped steel component with a horizontally extending end structure and screw holes. Screw holes are also present at corresponding positions at the upper and lower ends. After the ball node is placed in, bolts are passed through the screw holes at the end and upper end to ensure a tight connection between the ball clamp and the ball node. The ball partition 24 is an L-shaped component with a certain slope at the lower end. After the ball node is placed on the ball partition 24, the ball node can roll into the conveyor arm 3 along the slope. A sealing door 212 is provided on the front side of the housing 21. A second sliding groove 2121 is provided at the contact point between the sealing door 212 and the housing 21. Protrusions are provided on the upper and lower sides of the sealing door 212 to limit its sliding within the second sliding groove 2121. A handle 2122 is provided at the end of the sealing door 212. In use, the handle 2122 is pulled to open the sealing door 212, allowing two ball nodes to be placed into the ball partition 24. Then, one ball node is placed into the ball clamp 22 and secured with bolts.

[0038] like Figure 1 , Figure 4-5As shown, the conveying arm 3 includes a conveying pipe 31, a hinge 32, and a limiting box 33. The conveying pipe 31 is symmetrically welded to both ends of the box body 21. The conveying pipe 31 is a cuboid box with an internally excavated circular groove. The diameter of the circular groove is the same as the diameter of the spherical openings on the left and right sides of the box body 21. The position of the circular groove is aligned with the spherical openings on the left and right sides of the box body 21. After the spherical node is placed into the spherical partition 24, it will slide down the conveying pipe 31. A hinge 32 is provided at the end of the conveying pipe 31. Two first sliding grooves 321 are symmetrically arranged on the hinge. The limiting box 33 is a cuboid box with a semi-circular groove on its inner side. The radius of the semi-circular groove is the same as the radius of the spherical openings on the left and right sides of the box body 21. The limiting box 33 slides in the first sliding groove 321 by a first limiting block 332 provided on its rear side. The upper and lower ends of the limiting box 33 are symmetrically provided with connecting holes 331. Before inserting the ball joint, the limiting box 33 is slid to the end of the first sliding groove 321, and a bolt is passed through the connecting hole 331 to make the two corresponding limiting boxes 33 on the left and right sides. When the first limiting block 332 moves to the end of the first sliding groove 321, the distance between the limiting box 33 and the other symmetrically arranged limiting box 33 is the width of the ball clamp 22. After the ball joint slides down the conveying pipe 31, it will be fixed in the circular groove inside the limiting box 33.

[0039] like Figure 6 , Figure 8 As shown, the fixed bracket 4 includes a support platform 41, first legs 42, second legs 43, and a base 44. The support platform 41 is a hexagonal steel component with a connecting screw head 411 at the center of its top. The connecting screw head 411 can be screwed into the bolt hole at the lower end of the ball clamp 22 for connection. A laser emitter 5 is located at the center of the bottom of the support platform 41. By turning on the laser emitter 5, the ball node can be precisely positioned according to the laser point on the ground. The six first legs 42 have slots at one end and two holes at the other end, which are rotatably connected to the hexagon of the support platform 41. The surface of the first legs 42 has evenly distributed positioning holes 421. The second legs 43 are steel plates with a width and thickness smaller than the slot width and thickness of the first legs 42. The end of the second legs 43 has a positioning hole 421. In use, the second legs 43 are inserted into the slots of the first legs 42. According to the height from the ground, a suitable positioning hole 421 is selected, and the first legs 42 and the second legs 41 are fixed by a pin. The other end of the second leg 43 is rotatably connected to the base 44, which is a semi-cylinder with a hole in the middle. After rotation, the plane of the base 44 can be in contact with the ground.

[0040] like Figure 4-6As shown, after the ball node is fixed in the circular groove of the limiting box 33, the ball clamp 22 is inserted into the limiting box 33, and the ball clamp 22 is tightly fixed to the ball node by inserting bolts into the screw holes at the end and the top of the ball clamp 22. After the fixing bracket 4 is installed at the lower end of the ball clamp 22 and it is confirmed that the ball node is effectively supported, the bolts of the fixing connection hole 331 are removed, and the limiting box 33 is slid to the end of the first sliding groove 321 on both sides. The hinge 32 is rotated to rotate the limiting box 33 from the end of the conveying pipe 31 to both sides, so that the conveying arm 3 structure can avoid the ball node that has been positioned during the process of continuing to push the positioning device forward.

[0041] A method for using a steel space frame ball node positioning device includes the following steps:

[0042] S1: Based on the on-site layout and positioning results and the actual dimensions of the site, select several positioning tracks 1 and lay them symmetrically on the ground. They are connected to the positioning blocks 13 through the positioning grooves 12 at their ends. During the laying process, the positioning tracks 1 are fixed to the ground with bolts through the fixing holes 11.

[0043] S2: Push the positioning box 2 into the laid positioning track 1 through the bottom traveling roller 25. According to the distance scale shown on the track and the on-site layout positioning results, continue to push the positioning box 2 to the position where the lower chord ball is placed to complete the coarse positioning of the ball node.

[0044] S3: Pull the limiting box 33 to the end of the first sliding groove 321, and rotate the hinge 32 to align the left and right limiting boxes 33. Use bolts to pass through the connecting hole 331 to connect the two limiting boxes 33. Open the sealing door 212, put two lower chord ball nodes on the ball partition 24, and close the sealing door 212.

[0045] S4: After the ball node placed on the ball partition 24 rolls into the limiting box 33 due to the slope, the ball clamp 22 is placed into the gap of the limiting box 33. The two lower chord ball nodes that slide down from the ball partition 24 are clamped and fixed by bolts passing through the screw holes at the end and top of the ball clamp 22. The fixing bracket 4 is screwed into the lower screw hole of the ball clamp 22 through the upper connecting screw head 411. The laser emitter 5 is turned on, and the precise positioning of the lower chord ball node is completed according to the laser point and the on-site laying result. When the lower chord ball node is determined to have moved to the correct laying position, the six first legs 42 are rotated to the same angle, and each second leg 43 is pulled out to the ground length. The base 44 is rotated until the bottom surface touches the ground. The second leg 43 is fixed to the first leg 42 by the pin passing through the positioning hole 421.

[0046] S5: Remove the bolts passing through the connecting hole 331, slide the positioning box 33 to the other end of the first sliding groove 321, fold the hinge 32, and turn the hinge to a direction parallel to the outer side of the conveying pipe 31. Repeat this process to complete the positioning of all lower chord ball joints in one stroke, and simultaneously perform the welding of the horizontal members of the lower chord ball joints parallel to the direction of travel.

[0047] S6: After the last pair of lower chord ball nodes are positioned, open the sealing door 212, insert an upper chord ball node into the ball clamp 22, and clamp the ball clamp 22 with bolts through the screw holes at the rear end of the ball clamp. Close the sealing door 212, open the laser emitter 5 located at the bottom of the box 21, and push the positioning box 2 in the opposite direction to the starting point. Based on the laser point and the on-site layout results, complete the precise positioning of the upper chord ball node. Drive the lifting cylinder 23 to lift the upper chord ball node to the design elevation, and perform the welding work of the oblique rods between the upper and lower chord balls, as well as the welding work of the horizontal rods parallel to the direction of travel between adjacent upper chord ball nodes. After the welding is completed, drive the lifting cylinder 23 to retract into the box 21 and continue to push the positioning box 2. At this time, the welding work of the horizontal rods of the lower chord ball perpendicular to the direction of travel is completed. Repeat this cycle to complete the positioning and welding work of all ball nodes in one stroke.

[0048] Working Principle: Before the positioning operation begins, based on the designed positioning coordinates, the positioning track 1 is successively overlapped using positioning grooves 12 and positioning blocks 13 in the direction with the most required positioning ball nodes. Then, bolts are used to pass through fixing holes 11 to fix the positioning track 1 to the ground. The positioning box 2, with two conveyor arms 3 already welded on, is pushed into the laid positioning track 1 via the bottom travel rollers 25. Bolts are used to pass through the connecting holes 331 at the upper end of the limiting box 33 to fix the ends of the conveyor arms 3. The sealing door 212 is opened, and the two lower chord ball nodes are placed on the ball partitions 24 on both sides inside the box 21. Due to the slope of the ball partitions 24, the lower chord ball nodes placed on both sides will roll into the limiting box 33. After pulling and closing the sealing door 212, the device is pushed forward. During the movement, coarse positioning of the ball nodes inside the limiting box 33 is performed according to the distance scale of the positioning track 1 at the edge of the positioning box 2. After the device has roughly reached the positioning point, the ball clamp 22 is placed into the gap of the limiting box 33. Two lower chord ball nodes that slide down from the ball partition 24 are clamped and fixed by bolts passing through the screw holes at the end and top of the ball clamp 22. The fixing bracket 4 is screwed into the lower screw hole of the ball clamp 22 through the connecting screw head 411 at the top. The laser emitter 5 located at the bottom of the box 21 is turned on, and the precise positioning of the lower chord ball nodes is completed based on the laser point and the on-site laying results. When the lower chord ball nodes are confirmed to be in the correct laying position, the six first legs 42 are rotated to the same angle, and each second leg 43 is pulled out to the ground contact length. The base 44 is rotated until its bottom surface touches the ground, and the second legs 43 are fixed to the first legs 42 by pins passing through the positioning holes 421. At this time, the two lower chord balls are fully fixed on the ball clamp 22. Remove the bolts from the fixing connection holes 331, slide the limiting box 33 to the ends of the first sliding groove 321, rotate the hinge 32 to rotate the limiting box 33 from the end of the conveying pipe 31 to both sides, so that the conveying arm 3 structure can avoid the already positioned ball nodes during the process of continuing to push the positioning device forward. Repeat this cycle to complete the positioning of all lower chord ball nodes in one stroke, and simultaneously perform the horizontal rod welding work of the lower chord ball nodes parallel to the direction of travel. After the last pair of lower chord ball nodes is positioned, open the sealing door 212, put an upper chord ball node into the ball clamp 22 in the middle inside the box 21, and use bolts to pass through the screw holes at the end and top of the ball clamp 22 to tightly connect the ball clamp 22 to the ball node. Close the sealing door 212, turn on the laser emitter 5 located at the bottom of the box 21, push the positioning box 2 in the opposite direction to the starting point, and complete the precise positioning of the upper chord ball node according to the laser point and the on-site layout results.After the position of the upper chord ball joint is determined, the lifting cylinder 23 is driven to lift the upper chord ball joint to the design elevation. Welding work is carried out on the diagonal members between the upper and lower chord balls, as well as the horizontal members parallel to the direction of travel between adjacent upper chord ball joints. After the welding is completed, the lifting cylinder 23 is driven to retract into the housing 21. The positioning box 2 is then pushed and a new upper chord ball joint is placed and fixed. At this time, the welding work on the horizontal members of the lower chord ball perpendicular to the direction of travel is completed. This cycle is repeated to complete the positioning and welding work of all ball joints in one stroke.

[0049] 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 should also be considered within the scope of protection of the present invention.

Claims

1. A ball node positioning device for a steel space frame, characterized in that: The steel grid ball node positioning device includes a positioning track (1), a positioning box (2), a conveying arm (3), a fixed bracket (4) and a laser emitter (5). The positioning box (2) runs on the upper part of the positioning track (1), and the conveying arm (3) is provided on the left and right sides of the positioning box (2). The laser emitter (5) is installed on the lower surface of the positioning box (2) and the fixed bracket (4). The positioning box (2) includes a box body (21), a ball clamp (22), a lifting cylinder (23), a ball partition (24), and traveling rollers (25). The box body (21) is a box-shaped structure with two protruding limbs at the bottom and a rectangular box at the top. The box body (21) has spherical openings on the left and right sides and a rectangular opening at the top. The box body (21) has a movable groove (211) at the rear and a rectangular space at the front. Ball partitions (24) are set on both sides of the space and a ball clamp (22) is set in the middle. Several traveling rollers (25) are symmetrically set at the junction of the two protruding limbs at the bottom of the box body (21) and the positioning track (1). A laser emitter (5) is set at the bottom of the box body (21), and its axis is on the same straight line as the axis of the lifting cylinder (23). The ball clamp (22) is a C-shaped steel component with a horizontally extended end structure and screw holes. Screw holes are also opened at corresponding positions at the upper and lower ends. The width of the movable groove (211) is the same as the thickness of the ball clamp (22). The lifting cylinder (23) is a hydraulic mechanism with a rectangular plate on the top. The rectangular plate is welded to the lower clamp of the ball clamp (22). The ball partition (24) is an L-shaped component with a certain slope at the lower end. A sealing door (212) is also provided on the front side of the box (21). A handle (2122) is provided at the end of the sealing door (212). A second sliding groove (2121) is opened at the contact point between the sealing door (212) and the box (21). The traveling roller (25) rotates around a J-shaped component roller shaft (251). The conveying arm (3) includes a conveying pipe (31), a hinge (32), and a limiting box (33). The conveying pipe (31) is symmetrically welded to both ends of the box body (21). The conveying pipe (31) is a cuboid box with an internally excavated circular groove. The diameter of the circular groove is the same as the diameter of the spherical openings on the left and right sides of the box body (21). The position of the circular groove is aligned with the spherical openings on the left and right sides of the box body (21). A hinge (32) is provided at the end of the conveying pipe (31). Two first sliding grooves (321) are symmetrically provided on the surface of the hinge. The limiting box (33) The box (33) is a cuboid box with a semi-circular groove on the inner side. The radius of the semi-circular groove is the same as the radius of the spherical openings on the left and right sides of the box body (21). The limiting box (33) slides in the first sliding groove (321) through the first limiting block (332) set on its rear side. The upper and lower ends of the limiting box (33) are symmetrically provided with connecting holes (331). When the first limiting block (332) moves to the end of the first sliding groove (321), the distance between the limiting box (33) and the other symmetrically provided limiting box (33) is the width of the ball clamp (22).

2. The steel space frame ball node positioning device according to claim 1, characterized in that: The positioning track (1) is an I-shaped steel component with a slot at one end and a protrusion at the other end. It is provided with fixing holes (11), positioning grooves (12), and positioning blocks (13). The fixing holes (11) are equidistantly opened on the surface of the positioning track (1), and the hole depth is consistent with the height of the positioning track (1). The positioning track (1) has a positioning groove (12) at one end in the longitudinal direction and a positioning block (13) at the other end. The groove width of the positioning groove (12) is the same as the width of the positioning block (11). The outer surface of the positioning track (1) is also marked with distance scale.

3. The steel grid spherical node positioning device according to claim 1, characterized in that: The fixed bracket (4) includes a support platform (41), a first leg (42), a second leg (43), and a base (44). The support platform (41) is a hexagonal steel component with a connecting screw head (411) in the center of its top and a laser emitter (5) in the center of its bottom. The support platform (41) is rotatably connected to six first legs (42) on its side. The first leg (42) is a steel plate with a groove in the middle and positioning holes (421) evenly opened on its surface. The second leg (43) is a steel plate with a width and thickness smaller than the groove width and thickness of the first leg (42). The second leg (43) has a positioning hole (421) at one end and is rotatably connected to the base (44) at the other end. The base (44) is a semi-cylinder with a hole in the middle.

4. A method of using a steel space frame ball node positioning device, implemented based on the steel space frame ball node positioning device according to any one of claims 1-3, characterized in that, The method includes the following steps: S1: Based on the on-site layout and positioning results and the actual size data of the site, select several positioning tracks (1) to be laid symmetrically on the ground, and connect them to the positioning blocks (13) through the positioning grooves (12) at their ends. When laying, fix the positioning tracks (1) to the ground with bolts according to the fixing holes (11); S2: Push the positioning box (2) into the laid positioning track (1) through the bottom travel roller (25). According to the distance scale shown on the track and the on-site layout positioning results, continue to push the positioning box (2) to the lower chord ball placement position to complete the coarse positioning of the ball node. S3: Pull the limit box (33) to the end of the first sliding groove (321) and rotate the hinge (32) to align the two limit boxes (33) on the left and right. Use bolts to pass through the connecting hole (331) to connect the two limit boxes (33); open the sealing door (212), put two lower chord ball nodes on the ball partition (24), and close the sealing door (212). S4: After the ball node placed on the ball partition (24) rolls into the limit box (33) due to the slope, put the ball clamp (22) into the gap of the limit box (33). By passing the bolt through the screw holes at the end and the top of the ball clamp (22), clamp and fix the two lower chord ball nodes that have slid down from the ball partition (24). Screw the fixing bracket (4) into the lower screw hole of the ball clamp (22) through the upper connecting screw head (411). Turn on the laser emitter (5). According to the laser point and the on-site laying result, complete the precise positioning of the lower chord ball node. When the lower chord ball node moves to the correct laying position, rotate the six first legs (42) to the same angle, pull out each second leg (43) to the ground length, rotate the base (44) until the bottom surface touches the ground, and fix the second leg (43) and the first leg (42) by passing the pin through the positioning hole (421). S5: Remove the bolts passing through the connecting hole (331), slide the positioning box (33) to the other end of the first sliding groove (321), fold the hinge (32), and turn the hinge to a direction parallel to the outer side of the conveying pipe (31); repeat this cycle to complete the positioning of all lower chord ball nodes in one stroke, and simultaneously carry out the horizontal rod welding work of the lower chord ball nodes parallel to the direction of travel. S6: After the last pair of lower chord ball nodes are positioned, open the sealing door (212), put an upper chord ball node into the ball clamp (22), and clamp the ball clamp (22) with bolts through the screw hole at the rear end of the ball clamp. Close the sealing door (212), open the laser emitter (5) located at the bottom of the box (21), and push the positioning box (2) in the opposite direction to the starting point. According to the laser point and the on-site layout results, complete the precise positioning of the upper chord ball node. Drive the lifting cylinder (23) to lift the upper chord ball node to the design elevation, and carry out the welding work of the oblique rod between the upper chord ball and the lower chord ball, and the welding work of the horizontal rod parallel to the direction of travel between adjacent upper chord ball nodes. After the welding is completed, drive the lifting cylinder (23) to retract into the box (21) and continue to push the positioning box (2). At this time, the welding work of the horizontal rod of the lower chord ball perpendicular to the direction of travel is completed. Repeat this cycle to complete the positioning and welding work of all ball nodes in one stroke.

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