Steel truss girder integral node chord member first hole method manufacturing and positioning device and method thereof

Abstract

The invention provides a steel truss integral node chord member first hole method manufacturing positioning device and a method thereof, and relates to the field of steel truss integral node chord member first hole method manufacturing. A longitudinal driving assembly B is fixedly connected to the interior of a limiting assembly. The problems that when a workpiece is punched, a chalk and other tools are manually held for scribing, however, the scribing mode is low in efficiency, the situation that a wire harness is broken easily due to instability during scribing is caused during scribing, and then deviation occurs during punching of the workpiece are solved, and when scribing is carried out, the workpiece cannot be punched easily. Pigments used during marking can be manually fed through an opening in the top end of the material tank, and after feeding is completed, the driving assembly A can be synchronously used for pushing the moving base to achieve automatic and accurate marking operation instead of manual work. Compared with traditional manual lineation, the design can improve the stability and precision of lineation of the wire harness.

Description

Technical Field

[0001] The invention belongs to the field of making a steel truss integral node chord by a hole-first method, and particularly relates to a steel truss integral node chord making by a hole-first method positioning device and a method thereof. Background Art

[0002] At present, steel truss bridges have the characteristics of superior wind resistance, low building height, and short construction period. They have been widely used in bridges of different spans. Among them, steel trusses connected by high-strength bolts are more widely used. However, since the application of bolt-connected steel truss bridges, the post-hole method is mainly used in the manufacture of chords, and the first-hole method is supplemented. In particular, the bolt hole groups on the integral node chords are mainly made by the post-hole method, and only about 10% of the bolt holes are made by the first-hole method. Although this method can ensure the hole making accuracy of the chord, the work efficiency is low. After the chord assembly and welding are completed, it is necessary to turn over and drill holes, and a large amount of drilling equipment and site resources are occupied after the rod is manufactured. However, with the maturity of the chord assembly and welding technology, and the precise control of the chord welding shrinkage, the chord manufacturing technology mainly using the first-hole method has been realized. In order to improve the manufacturing efficiency of steel truss chords and save site resources, a first-hole method manufacturing method for the integral node chord of steel trusses has been developed.

[0003] However, when the existing steel truss integral node chord rod is manufactured by the hole-first method, a marking device is needed to mark the drilling position. When marking the integral node of the steel truss, a clamp is generally used to clamp the workpiece, and then the marking is performed manually with a handheld chalk or other tool. However, this marking method is not only inefficient, but also very easy to cause the wire harness to be disconnected due to the instability during marking, which will cause deviations in the workpiece when drilling.

[0004] Therefore, in view of the shortcomings of the above-mentioned scheme in actual production and implementation, it is revised and improved. At the same time, in the spirit and concept of seeking improvement, with the assistance of professional knowledge and experience, and after many ingenuity and experiments, the present invention is created. A steel truss integral node chord first hole method production positioning device and method are provided to solve the existing problem that the workpiece is generally clamped by a clamp and then manually marked with tools such as chalk. However, this marking method is not only inefficient, but also it is easy to cause the wire harness to be disconnected due to the instability during marking, which will cause the workpiece to deviate when drilling. Summary of the invention

[0005] The present invention proposes a positioning device and method for manufacturing a steel truss integral node chord by a hole-first method, which solves the problem in the prior art that a workpiece is generally clamped with a fixture and then manually marked with a tool such as chalk. However, this marking method is not only inefficient, but also easily causes the wire harness to be disconnected due to the instability during marking, which in turn causes the workpiece to deviate when drilling holes.

[0006] The technical solution of the present invention is achieved as follows: a steel truss integral node chord first hole method manufacturing positioning device includes a support mechanism, the support mechanism includes a seat body and a guide groove, the outer wall of the support mechanism is fixedly connected with four lifting mechanisms in a ring array, the top of the support mechanism is rotatably connected with a steering mechanism, the steering mechanism includes a guide assembly, and the inside of the guide assembly is rotatably connected with a marking mechanism;

[0007] The marking mechanism includes a moving seat and a guide block, the outer side of the moving seat is fixedly connected with two convex guide blocks in opposite directions, the top and bottom of the moving seat are fixedly connected with mounting plates, the top of the mounting plate located on the upper side is fixedly connected with a material tank, the bottom end surface of the mounting plate located on the lower side is fixedly connected with an identification component for identifying the marking position, two limit assemblies are fixedly connected in a linear array on the bottom end surface of the mounting plate, the interior of the limit assembly is fixedly connected with a longitudinal driving assembly B, the bottom end of the driving assembly B is installed with a transfer seat slidably connected to the limit assembly, the transfer seat is connected to the material tank through a pipe, and the bottom end of the transfer seat is fixedly connected with a nozzle that penetrates the pipe:

[0008] As a preferred embodiment, an annular guide groove is provided at the top of the seat body, and mounting frames with inward openings are fixedly connected to the left and right sides of the seat body, a servo motor is installed on the outside of the mounting frame, and a driving gear is installed on the output end of the servo motor.

[0009] As a preferred embodiment, the lifting mechanism includes a connecting frame and a guide column, the bottom end of the connecting frame is fixedly connected to a cylindrical guide column, the inside of the guide column is screwed with an adjusting rod with external threads, and the bottom end of the adjusting rod is fixedly connected to a pad.

[0010] As a preferred implementation, the adjustment rod and the cushion block together form a support structure for the connecting frame, and the steering mechanism also includes a guide seat.

[0011] As a preferred embodiment, guide teeth meshing with the driving gear are fixedly connected in an annular array on the outer circumferential surface of the guide seat, and an annular guide ring is fixedly connected to the bottom end of the guide seat.

[0012] As a preferred embodiment, the guide seat is rotatably connected in the guide groove via a guide ring, and a transverse driving assembly A is fixedly connected to the inner side of the guide assembly.

[0013] As a preferred embodiment, rolling assemblies are installed in a ring array on the bottom end surface of the guide ring, and the guide ring is rotatably connected to the guide groove through the rolling assembly.

[0014] The invention discloses a method for manufacturing a steel truss integral node chord by a hole-first method, comprising the following steps:

[0015] Cut and blank the web, upper cover, lower cover and stiffening plate of the chord, and reserve 6‰-9‰ for welding shrinkage. Drill the bolt hole groups of the node plate, web joint plate, beam joint cover plate and beam joint web plate respectively, and drill the bolt hole groups of the upper cover plate, lower cover plate and the end of the web plate close to the node plate respectively;

[0016] The paint used for marking is put into the material tank through the top opening, and the recognition component installed on the bottom end surface of the moving seat is started to take pictures of the workpiece that needs to be marked. The marking position can be pre-adjusted through the recognition of the recognition component of the CCD lens structure. When marking, the marking position needs to be determined according to the bolt hole group;

[0017] The hole group position lines of the node plate, web joint plate, beam joint cover plate and beam joint web plate are marked based on the bolt hole group respectively. The longitudinal baseline and transverse baseline of the node plate are marked based on the node plate bolt hole group as the basis, which are used as the basis for assembly. The longitudinal baseline and transverse baseline of the lower cover plate are marked based on the lower cover plate bolt hole group, and the longitudinal baseline and transverse baseline of the upper cover plate are marked based on the upper cover plate bolt hole group;

[0018] Taking the hole group position lines of the beam joint cover plate and the beam joint web plate as the reference, assemble and weld them into a beam joint unit; taking the longitudinal baseline and transverse baseline on the node plate as the reference, assemble and weld the node plate, web plate and first stiffening rib into a web plate unit; taking the longitudinal baseline and transverse baseline on the node plate as the longitudinal baseline and transverse baseline of the web plate unit; taking the longitudinal baseline and transverse baseline on the upper cover plate as the reference, assemble and weld the upper cover plate and the second stiffening rib into an upper cover plate unit; taking the longitudinal baseline and transverse baseline on the lower cover plate as the reference, assemble and weld the lower cover plate, the third stiffening rib and the diaphragm into a lower cover plate unit; and assemble the two web plate units by welding at both sides of the lower cover plate unit along the length direction of the lower cover plate unit;

[0019] The beam joint unit and the web unit are welded and assembled based on the longitudinal baseline of the web unit and the position line of the beam joint unit hole group. The upper cover plate is hoisted through the node plate. After the upper cover unit is hoisted in place, the longitudinal and transverse positions are adjusted to ensure that the deviation between the upper cover plate hole group and the lower cover plate hole group is ≤0.5mm. The web joint plate is assembled and welded based on the bolt hole group of the node plate and the web joint plate;

[0020] To inspect the geometric dimensions of the chord, the longitudinal and transverse baselines of the chord are trimmed with the longitudinal and transverse baselines of the web unit. Based on the trimmed longitudinal and transverse baselines, the bolt hole groups of the upper cover plate, the lower cover plate and the end farthest from the web and the node plate are drilled respectively.

[0021] After using the above technical solution, the beneficial effects of the present invention are:

[0022] 1. In the present invention, a guide seat that can rotate around a seat body and a guide assembly fixedly connected to the inner side of the guide seat are provided. The movable seat slidably connected in the guide assembly can be displaced along the guide assembly under the pushing action of the driving assembly A, so that when marking, the pigment used for marking can be manually put in through the top opening of the material tank, and after the putting in is completed, the driving assembly A can be used to push the movable seat to realize automatic and precise marking operation instead of manual operation. Compared with traditional manual marking, this design can improve the stability and accuracy of marking.

[0023] 2. In the present invention, by providing an identification component fixedly connected to the bottom end surface of the movable seat, before marking and during marking, the current workpiece can be identified by the identification component and the marking position can be calculated. During the marking process, the identification component can be used to detect whether the current marking is broken. If a break is detected, the originally unactivated transfer seat and the nozzle can be moved downward by starting another drive component B to re-automatically coat the broken line. Compared with manual marking, which is prone to omissions, this design can mark more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of the front and side structure of the positioning device of the present invention after being disassembled;

[0026] Figure 2 It is a schematic diagram of the combined structure of the moving seat and the guide block of the positioning device of the present invention;

[0027] Figure 3 It is a schematic diagram of the top view of the positioning device of the present invention;

[0028] Figure 4It is a schematic diagram of the combined structure of the guide seat and guide teeth of the positioning device of the present invention;

[0029] Figure 5 It is a schematic diagram of the combined structure of the support mechanism and the lifting mechanism of the positioning device of the present invention;

[0030] Figure 6 It is a front side structural schematic diagram of the positioning device of the present invention;

[0031] Figure 7 It is a front structural schematic diagram of the positioning device of the present invention;

[0032] Figure 8 It is a schematic diagram of the combined structure of the seat body and the guide groove of the positioning device of the present invention;

[0033] Fig. 9 It is a schematic diagram of the integral node chord structure of the present invention;

[0034] In the figure:

[0035] 1. Support mechanism; 101. Base; 102. Guide groove; 103. Mounting frame; 104. Servo motor; 105. Driving gear; 2. Lifting mechanism; 201. Connecting frame; 202. Guide column; 203. Adjusting rod; 204. Pad; 3. Steering mechanism; 301. Guide seat; 302. Guide gear; 303. Guide ring; 304. Guide assembly; 305. Driving assembly A; 306. Rolling assembly; 4. Marking mechanism; 401. Moving seat; 402. Guide block; 403. Mounting frame Mounting plate; 404, material tank; 405, identification component; 406, limit component; 407, drive component B; 408, transfer seat; 409, connecting pipe; 410, nozzle; 5, lower cover plate; 6, first stiffening rib; 7, second stiffening rib; 8, third stiffening rib; 9, upper cover plate; 10, web rod joint plate; 11, node plate; 12, web plate of beam joint; 13, cover plate of beam joint; 14, web plate; 15, node plate hole group position line; 16, node plate horizontal baseline; 17, node plate longitudinal baseline. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1-Figure 9As shown, in this exemplary embodiment, a positioning device for manufacturing a steel truss integral node chord by a hole-first method is first provided, comprising: a support mechanism 1, the support mechanism 1 comprising a seat body 101 and a guide groove 102, four lifting mechanisms 2 are fixedly connected to the outer wall of the support mechanism 1 in a circular array, the top of the support mechanism 1 is rotatably connected to a steering mechanism 3, the steering mechanism 3 comprises a guide assembly 304, and the inner part of the guide assembly 304 is rotatably connected to a marking mechanism 4;

[0038] The marking mechanism 4 includes a moving seat 401 and a guide block 402. The outer side of the moving seat 401 is fixedly connected with two protruding guide blocks 402 in opposite directions. The top and bottom ends of the moving seat 401 are fixedly connected with mounting plates 403. The top of the mounting plate 403 located on the upper side is fixedly connected with a material tank 404. The bottom end surface of the mounting plate 403 located on the lower side is fixedly connected with an identification component 405 for identifying the marking position. Two limit assemblies 406 are fixedly connected in a linear array on the bottom end surface of the mounting plate 403. The interior of the limit assemblies 406 is fixedly connected with a longitudinal driving component B407. The bottom end of the driving component B407 is equipped with a transfer seat 408 slidably connected to the limit assembly 406. The transfer seat 408 is connected to the material tank 404 through a connecting pipe 409, and the bottom end of the transfer seat 408 is fixedly connected with a nozzle 410 that penetrates the connecting pipe 409.

[0039] Among them, an annular guide groove 102 is opened at the top of the base body 101, and the left and right sides of the base body 101 are fixedly connected with a mounting frame 103 with an opening facing inward, a servo motor 104 is installed on the outer side of the mounting frame 103, and a driving gear 105 is installed on the output end of the servo motor 104. The lifting mechanism 2 includes a connecting frame 201 and a guide column 202. The bottom end of the connecting frame 201 is fixedly connected with a cylindrical guide column 202, and the inside of the guide column 202 is screwed with an adjusting rod 203 with an external thread, and the bottom end of the adjusting rod 203 is fixedly connected with a pad 204.

[0040] Among them, the adjustment rod 203 and the pad 204 together constitute a supporting structure for the connecting frame 201, and the steering mechanism 3 also includes a guide seat 301, and the outer peripheral surface of the guide seat 301 is fixedly connected to a guide tooth 302 in an annular array that meshes with the driving gear 105 for transmission, and the bottom end of the guide seat 301 is fixedly connected to an annular guide ring 303.

[0041] Among them, the guide seat 301 is rotatably connected in the guide groove 102 through the guide ring 303, the inner side of the guide component 304 is fixedly connected with a horizontal driving component A305, and the rolling component 306 is installed in a ring array on the bottom end surface of the guide ring 303. The guide ring 303 is rotatably connected to the guide groove 102 through the rolling component 306.

[0042] In this example implementation, a method for manufacturing a steel truss integral node chord by a hole-first method is also provided, comprising the following steps:

[0043] 1) Cut the whole plate into pieces, and use CNC cutting equipment to precisely cut the main parts of the chord. The cutting requires that the lengths of the web (14), the upper cover plate (9), the lower cover plate (5), the first stiffening rib (6), the second stiffening rib (7) and the third stiffening rib (8) should be set to a welding shrinkage of 6‰-9‰.

[0044] 2) respectively drilling bolt hole groups on the node plate (11), the web joint plate (10), the beam joint cover plate (13) and the beam joint web plate (12), and respectively drilling bolt hole groups on the upper cover plate (9), the lower cover plate (5) and the web plate (14) near the chord node plate (11).

[0045] 3) The paint used for marking is put into the material tank 404 through the top opening, and the recognition component 405 installed on the bottom surface of the movable seat 401 is started to take a picture of the workpiece that needs to be marked. The marking position can be pre-adjusted through the recognition of the recognition component 405 of the CCD lens structure. When marking, the marking position needs to be determined based on the high-strength bolt hole.

[0046] 4) Using the bolt hole group as a reference, the hole group position lines of the node plate (11), the web joint plate (10), the beam joint cover plate (13) and the beam joint web plate (12) are marked respectively; using the bolt hole group of the node plate (11) as a reference, the node plate longitudinal baseline (17) and the node plate transverse baseline (16) are marked as a reference for assembly; using the bolt hole group of the lower cover plate (5) as a reference, the longitudinal baseline and transverse baseline of the lower cover plate (5) are marked; using the bolt hole group of the upper cover plate (9) as a reference, the longitudinal baseline and transverse baseline of the upper cover plate (9) are marked.

[0047] 5) After the marking is completed, the beam joint cover plate (13) and the beam joint web plate (12) are assembled and welded into a beam joint unit based on the hole group position line of the beam joint cover plate (13) and the beam joint web plate (12);

[0048] The node plate (11), the web plate (14) and the first stiffening rib (6) are assembled and welded into a web plate unit based on the node plate longitudinal baseline (17) and the node plate transverse baseline (16). In order to control the shrinkage of the butt weld between the node plate (11) and the web plate (14), the web plate (14) is required to be placed in the hole group baseline at a distance of 1.5 mm to 2 mm from the node plate hole group baseline.

[0049] The gusset plate longitudinal baseline (17) and the gusset plate transverse baseline (16) are used as the longitudinal baseline and transverse baseline of the web element;

[0050] Taking the longitudinal baseline and the transverse baseline on the upper cover plate (9) as references, assembling and welding the upper cover plate (9) and the second stiffening rib (7) into an upper cover plate unit;

[0051] The lower cover plate (5), the third stiffening rib (8) and the transverse diaphragm are assembled and welded into the lower cover plate unit based on the longitudinal and transverse baselines on the lower cover plate (5), and the verticality and assembly accuracy of the diaphragm are controlled. The two web plate units are welded and assembled on both sides of the lower cover plate unit along the length direction of the lower cover plate unit; the assembly accuracy of the transverse baselines of the web plate unit and the bottom plate unit is controlled, and the relationship between the bolt hole groups on the web plate unit and the bottom plate unit is tested at the same time. The hole group deviation is ≤0.5mm, which meets the requirements;

[0052] The beam joint unit and the web unit are welded and assembled based on the longitudinal baseline of the web unit and the position line of the beam joint unit hole group, with emphasis on controlling the assembly accuracy of the beam joint unit hole group and the baseline.

[0053] The upper cover plate unit is hoisted through the node plate (11). After the upper cover plate unit is hoisted into place, the longitudinal and transverse positions are adjusted to ensure that the hole group of the upper cover plate (9) and the hole group of the lower cover plate (5) have a deviation of ≤0.5 mm. The node plate hole group position line (15) and the web joint plate (10) hole group position line are used as references to assemble and weld the web joint plate (10);

[0054] The geometric dimensions of the chord are inspected by welding the chord using the full-position welding technology to reduce the welding deformation of the rod. The rod is trimmed using flame to ensure that the geometric dimension accuracy of the rod is ≤2mm and the hole group relationship accuracy meets the specification requirements. The longitudinal baseline and transverse baseline of the chord are trimmed with the longitudinal baseline and transverse baseline of the web unit. The bolt hole groups at the far end of the upper cover plate (9), the lower cover plate (5) and the web plate (14) and the node plate (11) are drilled respectively based on the trimmed longitudinal baseline and transverse baseline.

[0055] The present application provides a method for manufacturing a steel truss integral node chord by using a first-hole method. In the process of manufacturing the steel truss integral node chord, the operation is simple and the efficiency is high. It can not only ensure the geometric size accuracy and hole making accuracy of the integral node chord and improve the manufacturing quality of steel bridge components, but also improve the manufacturing efficiency of the chord and save site and equipment resources.

[0056] When in use, when it is necessary to perform marking operation on the workpiece in the integral node chord of the steel truss beam, the modular workpiece to be marked can be placed on the ground and the workbench, and the seat body 101 in the support mechanism 1 can be placed on the ground using the cushion block 204 fixedly connected to the bottom end surface of the adjustment rod 203. When placed, the extension range of the cushion block 204 can be adjusted by rotating the adjustment rod 203 installed in the guide column 202, so as to achieve the purpose of stably supporting the seat body 101.

[0057] After the base 101 is installed, the paint used for marking is put in through the top opening of the material tank 404, and the recognition component 405 installed on the bottom surface of the movable base 401 is started to take a picture of the workpiece that needs to be marked, and the marking position can be pre-adjusted through the recognition of the recognition component 405 of the CCD lens structure, and according to the different required marking deflection angles, the servo motor 104 installed on the outside of the mounting frame 103 is started to drive the driving gear 105 to rotate, and when the driving gear 105 rotates, the deflection angle of the current guide component 304 can be adjusted through the meshing transmission with the guide tooth 302 fixedly connected to the outside of the guide base 301;

[0058] After the adjustment is completed, the driving component B407 installed in a limit component 406 is started to push the transfer seat 408 and the nozzle 410 downward until the nozzle 410 is close to the workpiece that needs to be marked, and the pipe 409 supplies liquid to the inside of the nozzle 410 for automatic marking. During marking, the identification component 405 can be started to detect whether the current marking is broken. If a break occurs, the driving component B407 installed in another limit component 406 can be started to push down another transfer seat 408 and pipe 409 to achieve a supplementary marking operation, thereby achieving the purpose of precise marking.

[0059] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A positioning device for manufacturing a steel truss integral node chord by a hole-first method, comprising a support mechanism (1), the support mechanism (1) comprising a seat (101) and a guide groove (102), characterized in that: Four lifting mechanisms (2) are fixedly connected to the outer wall of the support mechanism (1) in a circular array, the top of the support mechanism (1) is rotatably connected to a steering mechanism (3), the steering mechanism (3) includes a guide assembly (304), and the inside of the guide assembly (304) is rotatably connected to a marking mechanism (4); The marking mechanism (4) comprises a movable seat (401) and a guide block (402), the outer side of the movable seat (401) is fixedly connected with two outwardly protruding guide blocks (402) in opposite directions, the top and bottom of the movable seat (401) are fixedly connected with mounting plates (403), the top of the mounting plate (403) located on the upper side is fixedly connected with a material tank (404), the bottom end surface of the mounting plate (403) located on the lower side is fixedly connected with an identification component (405) for identifying the marking position, the bottom end surface of the mounting plate (403) is fixedly connected with two limit assemblies (406) in a linear array, the interior of the limit assemblies (406) is fixedly connected with a longitudinal driving assembly B (407), and the bottom end of the driving assembly B (407) is installed There is a transfer seat (408) slidably connected in the limit assembly (406), the transfer seat (408) is connected to the material tank (404) through a connecting pipe (409), and the bottom end of the transfer seat (408) is fixedly connected to a nozzle (410) that penetrates the connecting pipe (409), the lifting mechanism (2) includes a connecting frame (201) and a guide column (202), the inside of the guide column (202) is screwed with an adjustment rod (203) with an external thread, and the steering mechanism (3) also includes a guide seat (301), the outer peripheral surface of the guide seat (301) is fixedly connected with a guide tooth (302) meshing with the driving gear (105) in an annular array, and the guide seat (301) is rotatably connected in the guide groove (102) through a guide ring (303).

2. The positioning device for manufacturing the integral node chord of a steel truss beam by the first hole method according to claim 1 is characterized in that: The top of the seat body (101) is provided with an annular guide groove (102), and the left and right sides of the seat body (101) are fixedly connected with mounting frames (103) with openings facing inwards, and a servo motor (104) is installed on the outer side of the mounting frame (103), and a driving gear (105) is installed on the output end of the servo motor (104).

3. The positioning device for manufacturing the integral node chord of a steel truss beam by the first hole method according to claim 1 is characterized in that: The bottom end of the connecting frame (201) is fixedly connected to a cylindrical guide post (202), and the bottom end of the adjusting rod (203) is fixedly connected to a cushion block (204).

4. The positioning device for manufacturing the integral node chord of a steel truss beam by the first hole method according to claim 3 is characterized in that: The adjusting rod (203) and the cushion block (204) together form a supporting structure for the connecting frame (201).

5. The positioning device for manufacturing the integral node chord of a steel truss beam by the first hole method according to claim 1 is characterized in that: An annular guide ring (303) is fixedly connected to the bottom end of the guide seat (301).

6. The positioning device for manufacturing the integral node chord of a steel truss beam by the first hole method according to claim 1, characterized in that: A transverse driving assembly A (305) is fixedly connected to the inner side of the guide assembly (304).

7. The positioning device for manufacturing the integral node chord of a steel truss beam by the first hole method according to claim 1 is characterized in that: Rolling assemblies (306) are installed in an annular array on the bottom end surface of the guide ring (303), and the guide ring (303) is rotatably connected to the guide groove (102) via the rolling assemblies (306).

8. A method for manufacturing a steel truss integral node chord by a hole-first method according to claims 1-7, characterized in that: The following steps are involved: Cut and blank the web, upper cover, lower cover and stiffening plate of the chord, and reserve 6‰-9‰ for welding shrinkage. Drill the bolt hole groups of the node plate, web joint plate, beam joint cover plate and beam joint web plate respectively, and drill the bolt hole groups of the upper cover plate, lower cover plate and the end of the web plate close to the node plate respectively; The paint used for marking is put into the material tank through the top opening, and the recognition component installed on the bottom end surface of the moving seat is started to take pictures of the workpiece that needs to be marked. The marking position can be pre-adjusted through the recognition of the recognition component of the CCD lens structure. When marking, the marking position needs to be determined according to the bolt hole group; The hole group position lines of the node plate, web joint plate, beam joint cover plate and beam joint web plate are marked based on the bolt hole group respectively. The longitudinal baseline and transverse baseline of the node plate are marked based on the node plate bolt hole group as the basis, which are used as the basis for assembly. The longitudinal baseline and transverse baseline of the lower cover plate are marked based on the lower cover plate bolt hole group, and the longitudinal baseline and transverse baseline of the upper cover plate are marked based on the upper cover plate bolt hole group; Taking the hole group position lines of the beam joint cover plate and the beam joint web plate as the reference, assemble and weld them into a beam joint unit; taking the longitudinal baseline and transverse baseline on the node plate as the reference, assemble and weld the node plate, web plate and first stiffening rib into a web plate unit; taking the longitudinal baseline and transverse baseline on the node plate as the longitudinal baseline and transverse baseline of the web plate unit; taking the longitudinal baseline and transverse baseline on the upper cover plate as the reference, assemble and weld the upper cover plate and the second stiffening rib into an upper cover plate unit; taking the longitudinal baseline and transverse baseline on the lower cover plate as the reference, assemble and weld the lower cover plate, the third stiffening rib and the diaphragm into a lower cover plate unit; and assemble the two web plate units by welding at both sides of the lower cover plate unit along the length direction of the lower cover plate unit; The beam joint unit and the web unit are welded and assembled based on the longitudinal baseline of the web unit and the position line of the beam joint unit hole group. The upper cover plate is hoisted through the node plate. After the upper cover unit is hoisted in place, the longitudinal and transverse positions are adjusted to ensure that the deviation between the upper cover plate hole group and the lower cover plate hole group is ≤0.5mm. The web joint plate is assembled and welded based on the bolt hole group of the node plate and the web joint plate; To inspect the geometric dimensions of the chord, the longitudinal and transverse baselines of the chord are trimmed with the longitudinal and transverse baselines of the web unit. Based on the trimmed longitudinal and transverse baselines, the bolt hole groups of the upper cover plate, the lower cover plate and the end farthest from the web and the node plate are drilled respectively.

Images