Large span truss structure welding joint quality inspection device

Abstract

The present invention discloses a quality inspection device for welding joints of a large-span truss structure, and relates to the technical field of welding inspection. The present invention comprises a base plate, a fixed frame is fixedly installed in the center of the top of the base plate, two rotating drums are symmetrically limited and rotatably connected on the left and right sides of the fixed frame, two groups of sliders are symmetrically limited and slidably connected in the upper and lower directions inside the rotating drum, the number of the sliders in a single group is two, and they are symmetrical front and back inside the rotating drum, a rotating shaft is limited and rotatably connected between the two sliders in a single group, the rotating shaft extends forward to the front side of the rotating drum, a roller is fixedly installed at the front end of the rotating shaft, and a tilt adjustment component is arranged inside the fixed frame. The present invention can meet the clamping requirements for welding parts with different bending angles, improves the practicality of the inspection device, can stably limit the centering of welding parts of different sizes, avoids uneven force or offset, improves the inspection effect, and is convenient and quick to operate, thereby improving the inspection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of welding detection, and in particular to a device for detecting quality of welding joints of a large-span truss structure. Background Art

[0002] A truss is a supporting beam structure formed by connecting rods with hinges at both ends through welding, riveting or bolts. Its advantage is that the rods mainly bear tension or pressure, so that the strength of the material can be fully utilized. When the span is large, it can save material compared to a solid beam. However, during the use of a large-span truss structure, it is more likely to deform under the action of stress, causing fractures at the welded joints of the large-span truss. Therefore, in order to ensure the normal use of the large-span truss, the welded joints of the welded parts in the large-span truss structure need to be quality inspected before assembly.

[0003] However, the existing large-span truss structure welding joint quality inspection device still has the following defects during use:

[0004] 1. In addition to straight long strips, the welded parts in the existing large-span truss structure are also welded into circular rings or angled bends to improve the stability of the support depending on the usage scenarios. However, the existing welding joint quality inspection device cannot flexibly adjust the clamping angle according to the different shapes of the welded parts during the clamping and limiting process of the welded parts. Therefore, it cannot be well applied to welded parts of different shapes, so the practicality of the inspection device needs to be improved.

[0005] 2. The existing detection device does not provide a stable centering limit for the welded parts during use. Therefore, when applying pressure to the welded parts, the welded parts are prone to uneven force or offset, which reduces the detection effect. At the same time, when clamping and limiting welded parts of different sizes, the operation is cumbersome, which reduces the efficiency of detection. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned problems that the clamping angle cannot be flexibly adjusted according to the different shapes of welded parts, so it cannot be well adapted to welded parts of different shapes, the practicality needs to be improved, and there is no stable centering limit for the welded parts, the welded parts are easily subjected to uneven force or offset, which reduces the detection effect, and at the same time, when clamping and limiting welded parts of different sizes, the operation is cumbersome, which reduces the detection efficiency. The present invention provides a large-span truss structure welding joint quality detection device.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] A quality inspection device for welded joints of a large-span truss structure comprises a base plate, a fixed frame is fixedly installed in the center of the top of the base plate, two rotating drums are symmetrically connected to the fixed frame on the left and right sides, two groups of sliders are symmetrically connected to the rotating drum in a limited sliding manner, and the number of sliders in a single group is two, and they are symmetrical front to back inside the rotating drum, a rotating shaft is connected to the two sliders in a limited rotation manner, the rotating shaft extends forward to the front side of the rotating drum, a roller is fixedly installed at the front end of the rotating shaft, a tilt adjustment component is arranged inside the fixed frame, a clamping adjustment component is arranged inside the rotating drum, and a limiting component is arranged inside the roller.

[0009] A hydraulic rod is fixedly installed at the center of the front end of the fixed frame, and an extrusion seat is fixedly installed at the bottom end of the hydraulic rod. The extrusion seat can change different shapes synchronously according to the extrusion requirements. The hydraulic rod drives the extrusion seat to extrude the welding joint of the welded part to detect the maximum pressure that the welding joint can withstand.

[0010] The locking mechanism that is formed on the hinge part of the upper and lower frames is used for the locking mechanism, and the locking mechanism can be adjusted according to the situation that the locking mechanism is in the locked state.

[0011] Furthermore, the threaded rod extends upward to the upper side of the fixed frame, and a turntable is fixedly installed on the top end of the threaded rod to facilitate driving the threaded rod to rotate.

[0012] Furthermore, the clamping adjustment assembly includes an outer rotating rod, which is rotatably connected to the outer rotating rod at the center of the interior of the rotating cylinder, one end of the outer rotating rod is rotatably connected to the inner wall of the rotating cylinder, and the other end extends to the interior of the inner sleeve, and the outer periphery of the outer rotating rod located in the inner area of ​​the rotating cylinder is provided with a threaded groove, and the outer side of the outer rotating rod located at the threaded groove inside the rotating cylinder is symmetrically threadedly connected to the second threaded sleeve, the outer side of the rotating shaft is rotatably connected to a round sleeve, the round sleeve is aligned with the second threaded sleeve, a transmission rod is transmission-connected between the round sleeve and the second threaded sleeve, and the inner sleeve is rotatably connected to the inner rotating rod at the center of the interior of the inner sleeve, and the inner rotating rod One end extends to the inner side of the inner sleeve, and the other end extends to the inside of the outer rotating rod and is limitedly slidably connected with the outer rotating rod. The inner rotating rod is located at one end of the mounting cylinder and is fixedly installed with bevel gear 1. The rear side of the bevel gear 1 inside the mounting cylinder is limitedly rotatably connected with bevel gear 2. Bevel gear 2 and bevel gear 1 are meshed with each other, so that during the rotation of bevel gear 2, bevel gear 1 can be driven to rotate at the same time. A connecting rod is fixedly installed at the center of the rear end of bevel gear 2, and the connecting rod extends backward to the rear side of the fixed frame, and a turning handle is fixedly installed at the rear end of the connecting rod to facilitate driving the connecting rod and bevel gear 2 to rotate.

[0013] Furthermore, the thread grooves on the outer periphery of the single outer rotating rod are symmetrically distributed, the threads are opposite, and are respectively threadedly connected to the two outer left-right symmetrical thread sleeves. Therefore, during the rotation of the outer rotating rod, the two left-right symmetrical thread sleeves can be driven to move toward or away from each other.

[0014] Furthermore, one end of the transmission rod is hinged to the left and right sides of the circular sleeve, and the other end is hinged to the upper and lower sides of the second threaded sleeve after being unfolded. Therefore, when the second threaded sleeve moves toward or away from each other, the transmission rod can push the circular sleeve to unfold to the upper and lower sides or move toward the middle.

[0015] Furthermore, the cross-section of the inner rotating rod extending to the inner area of ​​the outer rotating rod is in a "cross" shape, so as to realize the limited sliding connection between the inner rotating rod and the outer rotating rod, so that the inner rotating rod and the outer rotating rod can slide relative to each other, and the rotation of the inner rotating rod can also drive the outer rotating rod to rotate synchronously.

[0016] Furthermore, the limit assembly includes a front cylindrical block and a rear cylindrical block, the front and rear sides of the drum are symmetrically and slidingly connected with the front cylindrical block and the rear cylindrical block, a spring 1 is fixedly connected between the ends of the front and rear cylindrical blocks away from each other and the inner wall of the drum, a fixed limit block is evenly fixedly installed on the periphery of the rear cylindrical block, a movable limit block is evenly and rotationally connected to the periphery of the front cylindrical block, and a spring 2 is fixedly connected between the inner end of the movable limit block and the inner wall of the front cylindrical block, so that the movable limit block can elastically contract inward.

[0017] Furthermore, the fixed limit block and the movable limit block both extend outward to the outside of the roller and are both slidably connected to the roller. Therefore, the fixed limit block and the movable limit block can elastically clamp and limit the weldment placed between the rollers in a centered manner.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention, through the design of the tilt adjustment component, cooperates with the roller to utilize the limited rotation connection of the rotating drum inside the fixed frame. Before the detection, it is only necessary to rotate the threaded rod to achieve synchronous and symmetrical tilt adjustment of the rollers on the left and right sides. The operation is convenient, and it is not limited to clamping straight long strip welded parts, but can also meet the needs of clamping welded parts with different bending angles, thereby improving the practicability of the detection device.

[0020] 2. The present invention, through the coordinated design of the clamping adjustment component and the limiting component, can adjust the distance between the rollers on both sides at any time by simply turning the handle without affecting the roller tilt adjustment, thereby stably clamping welds of different thicknesses, and for the centering of the weld, it is only necessary to push the weld between the rollers and then release it. Therefore, welds of different sizes can be stably centered and limited, avoiding uneven force or offset, improving the detection effect, and at the same time, the operation is convenient and quick, thereby improving the efficiency of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0023] Figure 3 It is a schematic diagram of a partially cutaway three-dimensional structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the internal three-dimensional structure of the present invention;

[0025] Figure 5 It is a schematic diagram of a partially cutaway three-dimensional structure of the interior of the present invention;

[0026] Figure 6 The present invention Figure 5 A magnified view of the structure at center;

[0027] Figure 7 It is a schematic diagram of a partial three-dimensional structure of a tilt adjustment assembly of the present invention;

[0028] Figure 8 The partial cross-sectional view of the three-dimensional structure of the tilt adjustment component of the present invention is shown in FIG. Figure 1 ;

[0029] Fig. 9 The partial cross-sectional view of the three-dimensional structure of the tilt adjustment component of the present invention is shown in FIG. Figure 2 ;

[0030] Fig.10 It is a schematic diagram of a partially cutaway three-dimensional structure of a tilt adjustment assembly and a clamping adjustment assembly of the present invention;

[0031] Fig.11 The present invention is a schematic diagram of the three-dimensional structure of the drum Figure 1 ;

[0032] Fig.12 The present invention is a schematic diagram of the three-dimensional structure of the drum Figure 2 ;

[0033] Fig.13 It is a schematic diagram of a partially cutaway three-dimensional structure of a position limiting component of the present invention.

[0034] 1. The camshaft is provided with a plurality of camshafts, each of which is provided with a plurality of camshafts, and each of which is provided with a plurality of camshafts. The camshafts are provided with a plurality of camshafts, each of which is provided with a plurality of camshafts. The camshafts are provided with a plurality of camshafts, each of which is provided with a plurality of camshafts. DETAILED DESCRIPTION

[0035] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] A large-span truss structure welded joint quality inspection device according to a preferred embodiment of the present invention will be described in detail below. Figure 1-Figure 4 , Figure 8As shown, a quality inspection device for welding joints of a large-span truss structure comprises a base plate 1, a fixed frame 2 is fixedly installed in the center of the top of the base plate 1, two rotating drums 3 are symmetrically connected to the fixed frame 2 on both sides, two groups of sliders 4 are symmetrically connected to the rotating drum 3 in a limited sliding manner, and the number of the single group of sliders 4 is two, and they are symmetrical front to back inside the rotating drum 3, a rotating shaft 5 is connected to the two sliders 4 in a limited rotation, the rotating shaft 5 extends forward to the front side of the rotating drum 3, a roller 6 is fixedly installed at the front end of the rotating shaft 5, a tilt adjustment component 7 is arranged inside the fixed frame 2, a clamping adjustment component 8 is arranged inside the rotating drum 3, and a limiting component 9 is arranged inside the roller 6.

[0037] A hydraulic rod 10 is fixedly installed at the center of the front end of the fixed frame 2, and an extrusion seat 11 is fixedly installed at the bottom end of the hydraulic rod 10. The extrusion seat 11 can change different shapes synchronously according to the extrusion requirements. The hydraulic rod 10 drives the extrusion seat 11 to extrude the welding joint of the welded part to detect the maximum pressure that the welding joint can withstand.

[0038] During the inspection, the tilt adjustment assembly 7 is first used to synchronously and symmetrically adjust the tilt of the left and right drums 3 according to whether the weld is a straight strip, a circular ring, or an angled bend. This allows the roller 6 on the front side of the drum 3 to be tilted accordingly according to the different bending angles of the weld, making it easier to clamp the weld between the rollers 6 on both sides.

[0039] After the adjustment of the inclination angle of the roller 6 is completed, the distance between the two rollers 6 on the left and right sides is adjusted simultaneously by the clamping adjustment assembly 8 according to the different thicknesses of the welded parts, so that the roller 6 can meet the limit clamping requirements of welded parts of different thicknesses.

[0040] After completing the spacing adjustment of the rollers 6, push the weldment from the front side to between the two rollers 6 on the left and right sides, use the rollers 6 for clamping and limiting, and use the design of the internal limiting assembly 9 of the rollers 6 to center the weldment between the rollers 6. At the same time, adjust the welding joint of the weldment to the center between the rollers 6 on the left and right sides, and the clamping and limiting of the weldment is completed.

[0041] After the position limiting installation is completed, the hydraulic rod 10 drives the extrusion seat 11 to press the welding joint of the welded part downward, thereby detecting the maximum pressure that the welding joint can withstand.

[0042] Furthermore, if Figure 3-Figure 9As shown, the tilt adjustment assembly 7 includes an outer sleeve 71, and the outer sleeve 71 is fixedly installed on the adjacent sides of the left and right rotating cylinders 3. The fixed frame 2 is internally slidably connected with a mounting sleeve 72, and the mounting sleeve 72 is located at the center between the left and right outer sleeves 71. A sliding groove 73 is provided at the bottom of the mounting sleeve 72. The internal limiting sliding connection of the sliding grooves 73 on the left and right sides of the mounting sleeve 72 is connected with a limiting clamp 74, so that the limiting clamp 74 can rotate around the axis of the mounting sleeve 72 at the bottom of the mounting sleeve 72.

[0043] An inner sleeve 75 is fixedly installed in the middle of the limiting clamp block 74, one end of the inner sleeve 75 extends to the inside of the mounting tube 72, and the other end extends to the inside of the outer sleeve 71 and is slidably connected to the outer sleeve 71. A threaded sleeve 76 is fixedly installed in the middle of the front end of the mounting tube 72, and a threaded rod 77 is connected to the internal limiting rotation of the fixed frame 2. The threaded rod 77 passes through the threaded sleeve 76 and is threadedly connected to the threaded sleeve 76, so that during the rotation of the threaded rod 77, the threaded sleeve 76 and the mounting tube 72 can be driven to move up and down.

[0044] The threaded rod 77 extends upward to the upper side of the fixed frame 2, and a turntable is fixedly installed on the top of the threaded rod 77 to facilitate driving the threaded rod 77 to rotate.

[0045] The principle of synchronously and symmetrically adjusting the tilt of the left and right drums 3 by using the tilt adjustment assembly 7 is as follows:

[0046] The locking cam 76 is engaged with the locking cam 74 and the locking cam 77 is engaged with the locking cam 76 to move the locking cam 76 upwards.

[0047] Furthermore, if Figure 4 , Figure 8-Figure 10As shown, the clamping adjustment assembly 8 includes an outer rotating rod 81, which is connected to the outer rotating rod 81 in a transverse limited rotational connection at the center of the interior of the rotating drum 3. One end of the outer rotating rod 81 is connected to the inner wall of the rotating drum 3 in a limited rotational connection, and the other end extends to the interior of the inner sleeve 75. The outer rotating rod 81 is located on the periphery of the internal area of ​​the rotating drum 3 and is provided with a thread groove 82. The outer side of the outer rotating rod 81 located on the inner thread groove 82 of the rotating drum 3 is symmetrically threadedly connected with a thread sleeve 2 83. The thread grooves 82 on the outer periphery of a single outer rotating rod 81 are symmetrically distributed, with opposite threads, and are respectively threadedly connected to the outer left and right symmetrical thread sleeves 83. Therefore, during the rotation of the outer rotating rod 81, the two left and right symmetrical thread sleeves 83 can be driven to move toward or away from each other.

[0048] A circular sleeve 84 is rotatably connected to the outer side of the rotating shaft 5, and the circular sleeve 84 is aligned with the second threaded sleeve 83. A transmission rod 85 is transmission-connected between the circular sleeve 84 and the second threaded sleeve 83. One end of the transmission rod 85 is hinged to the left and right sides of the circular sleeve 84, and the other end is hinged to the upper and lower sides of the second threaded sleeve 83 after being unfolded. Therefore, when the second threaded sleeve 83 moves toward or away from each other, the circular sleeve 84 can be pushed to expand to the upper and lower sides or move toward the middle through the transmission rod 85.

[0049] An inner rotating rod 86 is connected to the inner sleeve 75 at the center thereof for limited rotation. One end of the inner rotating rod 86 extends to the inner side of the inner sleeve 75, and the other end extends to the inner side of the outer rotating rod 81, and is connected to the outer rotating rod 81 for limited sliding movement. The cross-section of the inner rotating rod 86 extending to the inner area of ​​the outer rotating rod 81 is in the shape of a "cross", so as to realize the limited sliding connection between the inner rotating rod 86 and the outer rotating rod 81, so that the inner rotating rod 86 and the outer rotating rod 81 can slide relative to each other, and the rotation of the inner rotating rod 86 can also drive the outer rotating rod 81 to rotate synchronously.

[0050] The inner rotating rod 86 is located at one end of the interior of the mounting tube 72 and is fixedly mounted with a bevel gear 1 87. The rear side of the bevel gear 1 87 inside the mounting tube 72 is limitedly rotated and connected with a bevel gear 2 88. The bevel gear 2 88 and the bevel gear 1 87 are meshed with each other, so that during the rotation of the bevel gear 2 88, the bevel gear 1 87 can be driven to rotate at the same time. A connecting rod 89 is fixedly mounted at the center of the rear end of the bevel gear 2 88. The connecting rod 89 extends backward to the rear side of the fixed frame 2, and a turning handle 810 is fixedly mounted at the rear end of the connecting rod 89 to facilitate driving the connecting rod 89 and the bevel gear 2 88 to rotate.

[0051] The principle of using the clamping adjustment component 8 to synchronously adjust the distance between the two rollers 6 on the left and right sides is as follows:

[0052] After the inclination angle of the rollers 6 on both sides is adjusted, the connecting rod 89 and the bevel gear 88 are driven to rotate by turning the handle 810. During the rotation of the bevel gear 88, the design of the bevel gear 88 and the two front bevel gears 87 being meshed with each other can drive the bevel gears 87 on both sides to rotate at the same time, thereby driving the inner rotating rods 86 on both sides to rotate, and utilizing the limited sliding connection between the inner rotating rod 86 and the outer rotating rod 81 to drive the outer rotating rod 81 to rotate synchronously.

[0053] During the rotation of the outer rotating rod 81, the threaded connection between the outer peripheral thread groove 82 of the outer rotating rod 81 and the threaded sleeve 83, as well as the symmetry of the outer peripheral thread groove 82 of the outer rotating rod 81 and the opposite thread design, can drive the threaded sleeve 83 to move toward or away from each other, and then, under the action of the transmission rod 85, the circular sleeve 84 can be driven to expand to the upper and lower sides or move toward the middle, and the rotation connection of the circular sleeve 84 on the outside of the rotating shaft 5 can drive the rotating shaft 5 and the roller 6 to expand or contract without affecting the rotation of the rotating shaft 5 and the roller 6, thereby adjusting the distance between the two rollers 6 to meet the needs of welding parts with different thicknesses.

[0054] At the same time, the inner rotating rod 86 and the outer rotating rod 81 are connected by a limited sliding connection through the rod body in the "cross" shaped cross-section area. During the telescopic movement of the outer sleeve 71 and the inner sleeve 75, the inner rotating rod 86 and the outer rotating rod 81 can also be driven to telescopically move, and at the same time, the outer rotating rod 81 can always be driven to rotate synchronously with the rotation of the inner rotating rod 86.

[0055] Furthermore, if Figure 4 , Figure 11-13 As shown, the limit assembly 9 includes a front cylindrical block 91 and a rear cylindrical block 92, and the front and rear sides of the drum 6 are symmetrically and slidably connected with the front cylindrical block 91 and the rear cylindrical block 92, and a spring 93 is fixedly connected between the ends of the front cylindrical block 91 and the rear cylindrical block 92 that are away from each other and the inner wall of the drum 6, and a fixed limit block 94 is evenly fixedly installed on the periphery of the rear cylindrical block 92, and a movable limit block 95 is evenly connected to the periphery of the front cylindrical block 91 for limiting rotation. The fixed limit block 94 and the movable limit block 95 both extend outward to the outside of the drum 6 and are both connected to the drum 6 for limiting sliding. Therefore, the fixed limit block 94 and the movable limit block 95 can elastically clamp and limit the welded parts placed between the drums 6 in the center.

[0056] A spring 2 96 is fixedly connected between one inner end of the movable limiting block 95 and the inner wall of the front cylindrical block 91 , so that the movable limiting block 95 can elastically contract inwardly.

[0057] The principle of using the limiting assembly 9 to limit the centering of the weldment is as follows:

[0058] After the inclination and spacing of the roller 6 are adjusted, the welding piece is pushed from the front side to between the two rollers 6 on the left and right sides. During the pushing process, when the rear end of the welding piece contacts the movable limit block 95, the movable limit block 95 will compress the spring 2 96 and rotate and shrink to the inside of the roller 6, so that the welding piece can continue to be pushed backward. When the rear end of the welding piece contacts the fixed limit block 94, continued pushing can push the fixed limit block 94 and the rear cylindrical block 92 to compress the spring 1 93 and move backward until the front end of the welding piece moves to the rear side of the movable limit block 95. At this time, the movable limit block 95 will pop out again under the action of the spring 2 96 to contact the front end of the welding piece, and then release the welding piece. By utilizing the action of the spring 1 93 on the front cylindrical block 91 and the rear cylindrical block 92, and cooperating with the clamping of the welding piece by the fixed limit block 94 and the movable limit block 95, the welding piece can be limited in the center between the rollers 6, and at the same time, it can also prevent the welding piece from offsetting when detecting stress deformation.

[0059] After the centering limit is completed, in order to improve stability, the distance between the rollers 6 can be further reduced by the clamping adjustment assembly 8 to clamp and limit the weldment more stably.

[0060] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for inspecting the quality of welded joints of a large-span truss structure, comprising a bottom plate (1), characterized in that: A fixed frame (2) is fixedly installed at the center of the top of the bottom plate (1); two rotating drums (3) are symmetrically connected to each other in a limited position and rotationally connected on the left and right sides of the fixed frame (2); two groups of sliders (4) are symmetrically connected to each other in a limited position and slidingly connected in the upper and lower directions inside the rotating drum (3); the number of the sliders (4) in a single group is two and they are symmetrical front to back inside the rotating drum (3); a rotating shaft (5) is connected to each other in a limited position and rotationally connected between the two sliders (4) in a single group; the rotating shaft (5) extends forward to the front side of the rotating drum (3); a roller (6) is fixedly installed at the front end of the rotating shaft (5); a tilt adjustment component (7) is arranged inside the fixed frame (2); a clamping adjustment component (8) is arranged inside the rotating drum (3); and a limited position component (9) is arranged inside the roller (6); The tilt adjustment assembly (7) comprises an outer sleeve (71), and the outer sleeve (71) is fixedly installed on the adjacent sides of the rotating cylinder (3) on the left and right sides. The interior of the fixed frame (2) is slidably connected with a mounting sleeve (72), and the mounting sleeve (72) is located at the center between the outer sleeves (71) on the left and right sides. A sliding groove (73) is provided at the bottom of the mounting sleeve (72). The interior of the sliding grooves (73) on the left and right sides of the mounting sleeve (72) is limitedly slidably connected with a limited clamping block (74). An inner sleeve (75) is fixedly mounted in the middle of the limit clamp (74), one end of the inner sleeve (75) extends into the interior of the mounting tube (72), and the other end extends into the interior of the outer sleeve (71) and is slidably connected to the outer sleeve (71), a threaded sleeve (76) is fixedly mounted in the middle of the front end of the mounting tube (72), a threaded rod (77) is rotatably connected to the interior of the fixed frame (2), the threaded rod (77) passes through the threaded sleeve (76) and is threadedly connected to the threaded sleeve (76).

2. The large-span truss structure welded joint quality inspection device according to claim 1 is characterized in that: The threaded rod (77) extends upward to the upper side of the fixed frame (2), and a rotating disk is fixedly mounted on the top end of the threaded rod (77).

3. The large-span truss structure welding joint quality inspection device according to claim 1 is characterized in that: The clamping adjustment assembly (8) comprises: An outer rotating rod (81), the outer rotating rod (81) is connected to the center of the rotating drum (3) in a transverse limited rotational manner, one end of the outer rotating rod (81) is connected to the inner wall of the rotating drum (3) in a limited rotational manner, and the other end extends to the interior of the inner sleeve (75); A thread groove (82), wherein the outer rotating rod (81) is provided with a thread groove (82) on the periphery of the inner area of ​​the rotating drum (3); The second threaded sleeve (83), the outer side of the outer rotating rod (81) located at the inner thread groove (82) of the rotating cylinder (3) is symmetrically threadedly connected with the second threaded sleeve (83); A circular sleeve (84), the outer side of the rotating shaft (5) is rotatably connected with the circular sleeve (84), and the circular sleeve (84) is aligned with the second threaded sleeve (83); A transmission rod (85), wherein the circular sleeve (84) and the second threaded sleeve (83) are transmission-connected with a transmission rod (85); An inner rotating rod (86), the inner rotating rod (86) is connected to the center of the inner sleeve (75) in a limited rotation manner, one end of the inner rotating rod (86) extends to the inner side of the inner sleeve (75), and the other end extends to the inside of the outer rotating rod (81), and is connected to the outer rotating rod (81) in a limited sliding manner; Bevel gear one (87), the inner rotating rod (86) is located inside the mounting tube (72) and one end of the inner rotating rod (86) is fixedly mounted with bevel gear one (87); Bevel gear 2 (88), the rear side of bevel gear 1 (87) inside the mounting cylinder (72) is limitedly rotatably connected to bevel gear 2 (88), and bevel gear 2 (88) and bevel gear 1 (87) are meshed with each other; A connecting rod (89), wherein a connecting rod (89) is fixedly mounted at the center of the rear end of the second bevel gear (88); The turning handle (810) is configured such that the connecting rod (89) extends backward to the rear side of the fixed frame (2), and the turning handle (810) is fixedly mounted on the rear end of the connecting rod (89).

4. The large-span truss structure welded joint quality inspection device according to claim 3 is characterized in that: The thread grooves (82) on the outer periphery of the single outer rotating rod (81) are symmetrically distributed, the threads are opposite, and are respectively threadedly connected to the second thread sleeve (83) on the outer side which is symmetrical on the left and right.

5. The large-span truss structure welding joint quality inspection device according to claim 3 is characterized in that: One end of the transmission rod (85) is hinged to the left and right sides of the circular sleeve (84), and the other end is hinged to the upper and lower sides of the second threaded sleeve (83) after being unfolded.

6. The large-span truss structure welded joint quality inspection device according to claim 3 is characterized in that: The cross-section of the inner rotating rod (86) extending to the inner region of the outer rotating rod (81) is in the shape of a cross, so as to realize a limited sliding connection between the inner rotating rod (86) and the outer rotating rod (81).

7. The large-span truss structure welded joint quality inspection device according to claim 1 is characterized in that: The limiting component (9) comprises: A front cylindrical block (91) and a rear cylindrical block (92), wherein the front cylindrical block (91) and the rear cylindrical block (92) are symmetrically slidably connected to the front and rear sides of the drum (6); Spring 1 (93), wherein a spring 1 (93) is fixedly connected between the ends of the front cylindrical block (91) and the rear cylindrical block (92) that are away from each other and the inner wall of the drum (6); A fixed stop block (94), the outer periphery of the rear cylindrical block (92) being evenly and fixedly mounted with the fixed stop block (94); A movable limiting block (95), wherein the outer periphery of the front cylindrical block (91) is evenly limited and rotationally connected to the movable limiting block (95); Spring 2 (96), a spring 2 (96) is fixedly connected between one end of the inner side of the movable limiting block (95) and the inner wall of the front cylindrical block (91).

8. The large-span truss structure welded joint quality inspection device according to claim 7 is characterized in that: The fixed limit block (94) and the movable limit block (95) both extend outward to the outside of the roller (6), and are both limitedly slidably connected to the roller (6).

9. The long-span truss structure welded joint quality inspection device according to any one of claims 1 to 8, characterized in that: A hydraulic rod (10) is fixedly mounted at the center of the front end of the fixed frame (2), and an extrusion seat (11) is fixedly mounted at the bottom end of the hydraulic rod (10); the extrusion seat (11) can be changed into different shapes synchronously according to extrusion requirements.

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