CN221911579U - Clamp for detecting welding seam of steel structure - Google Patents

Abstract

The utility model discloses a clamp for detecting welds of steel structures, which belongs to the technical field of detecting welds of steel structures. The key points of the technical scheme include a base, a support column is fixedly connected to the rear side of the top of the base, a support plate is fixedly connected to the top of the front side of the support column, a support bar is fixedly connected to the front side of the support plate, support sleeves are sleeved on both sides of the surface of the support bar, a fixing component is arranged on the top of the support sleeve, a fixing hole for use with the fixing component is opened on the top of the support bar, a connecting block is fixedly connected to the bottom of the support sleeve, an L-shaped plate is fixedly connected to the bottom of the connecting block, and a first clamping component is arranged on the left side of the top of the L-shaped plate, so as to solve the problems that the existing clamp is inconvenient to clamp steel structures of different lengths and is inconvenient to clamp steel structures with corners, thereby bringing inconvenience to users and being not conducive to use by users.

Description

A fixture for steel structure weld detection

Technical Field

The utility model relates to the technical field of steel structure weld detection, in particular to a clamp used for steel structure weld detection.

Background Art

Steel structure is a structure mainly made of steel and is one of the main types of building structures. The characteristics of steel are high strength, light weight, good overall rigidity and strong deformation ability, so it is particularly suitable for building large-span, super-high and super-heavy buildings. The material has good homogeneity and isotropy, and is an ideal elastic body, which best conforms to the basic assumptions of general engineering mechanics. The material has good plasticity and toughness, can have large deformation, and can withstand dynamic loads well. The construction period is short. It has a high degree of industrialization and can carry out specialized production with a high degree of mechanization. In the future, steel structures should study high-strength steel to greatly improve their yield point strength.

At present, there is a Chinese patent with announcement number CN220104952U. This utility model belongs to the field of fixture tooling technology, and in particular relates to a fixture for non-destructive testing of steel structures. The purpose of this utility model is to provide a fixture for non-destructive testing of steel structures, which can be arranged on the base plate unit by a column unit and a lifting-rotating rod unit, so that: 1. Both the downward clamping and the lateral clamping can be quickly established and quickly cancelled; 2. Steels with relatively small sizes can be placed directly on a single column unit, and can also be fully and appropriately clamped and fixed by the lifting-rotating rod unit; 3. The two clamping methods of downward clamping and lateral clamping are flexible and optional, and the clamping operation has a large scope of application.

When inspecting the welds of steel structures, a clamp is used to clamp the steel structure. Existing clamps are inconvenient to clamp steel structures of different lengths and are inconvenient to clamp steel structures with corners, which brings inconvenience to users and is not conducive to user use.

Utility Model Content

The utility model provides a clamp for steel structure weld detection, aiming to solve the problem that the existing clamp is inconvenient to clamp steel structures of different lengths and is inconvenient to clamp steel structures with corners, thus bringing inconvenience to users and being not conducive to use by users.

The utility model is implemented as follows: a clamp for steel structure weld detection comprises a base, a support column is fixedly connected to the rear side of the top of the base, a support plate is fixedly connected to the top of the front side of the support column, a support bar is fixedly connected to the front side of the support plate, support sleeves are sleeved on both sides of the surface of the support bar, a fixing assembly is arranged on the top of the support sleeve, a fixing hole for use with the fixing assembly is opened on the top of the support bar, a connecting block is fixedly connected to the bottom of the supporting sleeve, an L-shaped plate is fixedly connected to the bottom of the connecting block, a first clamping assembly is arranged on the left side of the top of the L-shaped plate, and a second clamping assembly is arranged on the right side of the top of the L-shaped plate;

The fixing assembly includes a fixing shell, a pull ring, a fixing rod, a first spring and a limit plate. The bottom of the fixing shell is fixedly connected to the top of the supporting sleeve, the top of the fixing rod is fixedly connected to the bottom of the pull ring, the bottom of the fixing rod sequentially penetrates the fixing shell and the supporting sleeve and extends to the inner cavity of the fixing hole, the first spring and the limit plate are sequentially sleeved on the surface of the fixing rod from top to bottom, the top of the first spring is fixedly connected to the top of the inner wall of the fixing shell, the bottom of the first spring is fixedly connected to the top of the limit plate, and the inner wall of the limit plate is fixedly connected to the surface of the fixing rod.

In order to achieve the effect of clamping and fixing the steel structure, as a preferred fixture for steel structure weld detection of the utility model, the first clamping assembly includes a fixed block, a crank, a threaded rod, a movable sleeve, a first clamping plate and a first baffle, the bottom of the fixed block is fixedly connected to the left side of the front side of the top of the L-shaped plate, the front side of the threaded rod is fixedly connected to the left side of the rear side of the crank, the rear side of the threaded rod passes through the fixed block and extends to the inner cavity of the movable sleeve, the front side of the first clamping plate is fixedly connected to the rear side of the movable sleeve, and the bottom of the first baffle is fixedly connected to the rear side of the top of the L-shaped plate.

In order to achieve the effect of clamping one section of a steel structure with a corner, as a preferred clamp for steel structure weld detection of the utility model, the second clamping assembly includes a fixed plate, a telescopic positioning rod, a second spring, a second clamping plate and a second baffle, the bottom of the fixed plate is fixedly connected to the top of the L-shaped plate, the left side of the telescopic positioning rod is fixedly connected to the right side of the fixed plate, the second spring is sleeved on the surface of the telescopic positioning rod, the left side of the second clamping plate is fixedly connected to the right side of the telescopic positioning rod, and the bottom of the second baffle is fixedly connected to the right side of the front side of the top of the L-shaped plate.

In order to increase the supporting stability of the support plate, as a preferred fixture for steel structure weld detection of the utility model, the front side of the bottom of the support plate is fixedly connected with a reinforcing rib, and the side of the reinforcing rib close to the support column is fixedly connected to the support column.

In order to prevent the support sleeve from slipping off the surface of the support bar, as a preferred fixture for steel structure weld detection of the utility model, both sides of the support bar are fixedly connected with limiting blocks, and the inner wall of the support sleeve is slidably connected to the surface of the support bar.

In order to achieve the effect that the fixing rod can fix the position of the support sleeve after the position of the support sleeve moves, as a preferred fixture for steel structure weld detection of the utility model, the number of the fixing holes is several and they are evenly opened on the top of the support bar.

In order to achieve the effect of allowing the fixing rod to move up and down, as a preferred clamp for steel structure weld detection of the utility model, the top and bottom of the fixing shell are both provided with movable openings for use with the fixing rod, and the side of the fixing rod surface close to the inner wall of the movable opening is in contact with the inner wall of the movable opening.

In order to achieve the effect of allowing the fixing rod to pass through the support sleeve and enter the inner cavity of the fixing hole, as a preferred clamp for steel structure weld detection of the utility model, the top of the support sleeve is provided with a through hole for use with the fixing rod, and the side of the surface of the fixing rod close to the inner wall of the through hole is in contact with the inner wall of the through hole.

In order to achieve the effect of allowing the threaded rod to move through the thread and positioning the position of the threaded rod through the thread, as a preferred fixture for steel structure weld detection of the utility model, the front side of the fixed block is provided with a threaded hole used in conjunction with the threaded rod, the surface of the threaded rod is connected to the inner wall of the threaded hole through a thread, and the rear side of the threaded rod surface is rotatably connected to the inner wall of the movable sleeve through a bearing.

In order to achieve the effect of positioning the first clamping plate so that the first clamping plate does not shake when moving, as a preferred clamp for steel structure weld detection of the utility model, the bottom of the first clamping plate is fixedly connected with a positioning slider, and the top of the L-shaped plate is provided with a positioning groove used in conjunction with the positioning slider, and the side of the positioning slider close to the inner wall of the positioning groove is in contact with the inner wall of the positioning groove.

Compared with the prior art, the beneficial effects of the utility model are:

The clamp for steel structure weld detection is provided with a base, a support column, a support plate, a support bar, a support sleeve, a fixing component, a fixing hole, a connecting block, an L-shaped plate, a first clamping component and a second clamping component. When in use, the positions of the two L-shaped plates are adjusted according to the length of the steel structure, and the fixation of the support sleeve is cancelled by adjusting the fixing component. Then, the support sleeve is moved on the surface of the support bar, the support sleeve drives the connecting block to move, and the connecting block drives the L-shaped plate to move to a suitable position. Then, the position of the support sleeve is fixed by the fixing component. Then, the steel structure is placed on top of the two L-shaped plates, and the steel structure is clamped by adjusting the two first clamping components, thereby achieving the effect of clamping steel structures of different lengths. When it is necessary to clamp a steel structure with a corner, one section can be clamped by the first clamping component, and the other section can be clamped by the second clamping component, thereby achieving the effect of clamping a steel structure with a corner.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is an overall structural diagram of a fixture for steel structure weld detection according to the present invention;

FIG2 is a cross-sectional structural diagram of the fixed shell in the utility model;

FIG3 is a structural diagram of a fixed shell in the utility model;

FIG4 is a structural diagram of the L-shaped plate, the first clamping assembly and the second clamping assembly in the present invention;

FIG. 5 is a structural diagram of the L-shaped plate, the fixing block and the first clamping plate in the present invention.

In the figure, 1, base; 2, support column; 3, support plate; 4, support bar; 5, support sleeve; 6, fixing component; 601, fixing shell; 602, pull ring; 603, fixing rod; 604, first spring; 605, limit plate; 7, fixing hole; 8, connecting block; 9, L-shaped plate; 10, first clamping component; 1001, fixing block; 1002, crank; 1003, threaded rod; 1004, movable sleeve; 1005, first clamping plate; 1006, first baffle; 11, second clamping component; 1101, fixing plate; 1102, telescopic positioning rod; 1103, second spring; 1104, second clamping plate; 1105, second baffle; 12, reinforcing rib; 13, limit block; 14, movable opening; 15, through opening; 16, threaded hole; 17, positioning slider; 18, positioning slide groove.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

Please refer to Figures 1-5. The utility model provides a technical solution: a clamp for steel structure weld detection, including a base 1, a support column 2 is fixedly connected to the rear side of the top of the base 1, a support plate 3 is fixedly connected to the top of the front side of the support column 2, a support bar 4 is fixedly connected to the front side of the support plate 3, support sleeves 5 are sleeved on both sides of the surface of the support bar 4, a fixing component 6 is arranged on the top of the support sleeve 5, a fixing hole 7 used in conjunction with the fixing component 6 is opened on the top of the support bar 4, a connecting block 8 is fixedly connected to the bottom of the supporting sleeve 5, an L-shaped plate 9 is fixedly connected to the bottom of the connecting block 8, a first clamping component 10 is arranged on the left side of the top of the L-shaped plate 9, and a second clamping component 11 is arranged on the right side of the top of the L-shaped plate 9;

The fixing assembly 6 includes a fixing shell 601, a pull ring 602, a fixing rod 603, a first spring 604 and a limiting plate 605. The bottom of the fixing shell 601 is fixedly connected to the top of the support sleeve 5, the top of the fixing rod 603 is fixedly connected to the bottom of the pull ring 602, the bottom of the fixing rod 603 sequentially passes through the fixing shell 601 and the support sleeve 5 and extends to the inner cavity of the fixing hole 7, the first spring 604 and the limiting plate 605 are sequentially sleeved on the surface of the fixing rod 603 from top to bottom, the top of the first spring 604 is fixedly connected to the top of the inner wall of the fixing shell 601, the bottom of the first spring 604 is fixedly connected to the top of the limiting plate 605, and the inner wall of the limiting plate 605 is fixedly connected to the surface of the fixing rod 603.

In this embodiment: by setting a base 1, a support column 2, a support plate 3, a support bar 4, a support sleeve 5, a fixing component 6, a fixing hole 7, a connecting block 8, an L-shaped plate 9, a first clamping component 10 and a second clamping component 11, when in use, the position of the two L-shaped plates 9 is adjusted according to the length of the steel structure, and the fixation of the support sleeve 5 is cancelled by adjusting the fixing component 6, and then the support sleeve 5 is moved on the surface of the support bar 4, the support sleeve 5 drives the connecting block 8 to move, and the connecting block 8 drives the L-shaped plate 9 to move to a suitable position, and then the position of the support sleeve 5 is fixed by the fixing component 6, and then the steel structure is placed on the top of the two L-shaped plates 9, and the steel structure is clamped by adjusting the two first clamping components 10, thereby achieving the effect of clamping steel structures of different lengths. When it is necessary to clamp a steel structure with a corner, one section can be clamped by the first clamping component 10, and the other section can be clamped by the second clamping component 11, thereby achieving the effect of clamping a steel structure with a corner.

As a technical optimization solution of the utility model, the first clamping assembly 10 includes a fixed block 1001, a crank 1002, a threaded rod 1003, a movable sleeve 1004, a first clamping plate 1005 and a first baffle 1006. The bottom of the fixed block 1001 is fixedly connected to the left side of the front side of the top of the L-shaped plate 9, the front side of the threaded rod 1003 is fixedly connected to the left side of the rear side of the crank 1002, the rear side of the threaded rod 1003 passes through the fixed block 1001 and extends to the inner cavity of the movable sleeve 1004, the front side of the first clamping plate 1005 is fixedly connected to the rear side of the movable sleeve 1004, and the bottom of the first baffle 1006 is fixedly connected to the rear side of the top of the L-shaped plate 9.

In this embodiment: by setting the fixed block 1001, the threaded rod 1003 can be supported, by setting the crank 1002, the threaded rod 1003 can be conveniently rotated, by setting the threaded rod 1003, the movable sleeve 1004 can be driven to move, by setting the movable sleeve 1004, in order to allow the threaded rod 1003 to rotate and drive the first clamping plate 1005 to move, by setting the first clamping plate 1005 and the first baffle 1006, the steel structure can be clamped and fixed.

As a technical optimization solution of the utility model, the second clamping assembly 11 includes a fixed plate 1101, a telescopic positioning rod 1102, a second spring 1103, a second clamping plate 1104 and a second baffle 1105. The bottom of the fixed plate 1101 is fixedly connected to the top of the L-shaped plate 9, the left side of the telescopic positioning rod 1102 is fixedly connected to the right side of the fixed plate 1101, the second spring 1103 is sleeved on the surface of the telescopic positioning rod 1102, the left side of the second clamping plate 1104 is fixedly connected to the right side of the telescopic positioning rod 1102, and the bottom of the second baffle 1105 is fixedly connected to the right side of the top front side of the L-shaped plate 9.

In this embodiment: by setting the fixing plate 1101, the position of the telescopic positioning rod 1102 can be fixed; by setting the telescopic positioning rod 1102, the second spring 1103 can be supported and the position of the second clamping plate 1104 can be positioned; by setting the second clamping plate 1104 and the second baffle 1105, one section of the steel structure with a corner can be clamped.

As a technical optimization solution of the present invention, a reinforcing rib 12 is fixedly connected to the front side of the bottom of the support plate 3 , and the side of the reinforcing rib 12 close to the support column 2 is fixedly connected to the support column 2 .

In this embodiment, by providing the reinforcing ribs 12 , the supporting stability of the supporting plate 3 can be increased.

As a technical optimization solution of the utility model, both sides of the support bar 4 are fixedly connected to the limiting blocks 13, and the inner wall of the support sleeve 5 is slidably connected to the surface of the support bar 4.

In this embodiment: by setting a limit block 13, the support sleeve 5 can be limited to prevent the support sleeve 5 from slipping off the surface of the support bar 4, and by setting the inner wall of the support sleeve 5 to be slidingly connected with the surface of the support bar 4, the support sleeve 5 can move on the surface of the support bar 4.

As a technical optimization solution of the present invention, the number of fixing holes 7 is several and they are evenly opened on the top of the support bar 4 .

In this embodiment, a plurality of fixing holes 7 are provided so that the fixing rod 603 can fix the position of the supporting sleeve 5 after the position of the supporting sleeve 5 is moved.

As a technical optimization solution of the utility model, the top and bottom of the fixed shell 601 are both provided with movable openings 14 used in conjunction with the fixed rod 603, and the side of the surface of the fixed rod 603 close to the inner wall of the movable opening 14 contacts the inner wall of the movable opening 14.

In this embodiment, the movable opening 14 is provided so that the fixing rod 603 can move up and down, and the side of the surface of the fixing rod 603 close to the inner wall of the movable opening 14 is provided to contact with the inner wall of the movable opening 14 so that the fixing rod 603 will not shake.

As a technical optimization solution of the utility model, a through hole 15 for use with the fixing rod 603 is opened on the top of the support sleeve 5, and the side of the surface of the fixing rod 603 close to the inner wall of the through hole 15 contacts the inner wall of the through hole 15.

In this embodiment: by setting the through opening 15, in order to allow the fixing rod 603 to penetrate the support and enter the inner cavity of the fixing hole 7, by setting the side of the surface of the fixing rod 603 close to the inner wall of the through opening 15 to contact the inner wall of the through opening 15, the fixing rod 603 can stably fix the position of the support sleeve 5.

As a technical optimization solution of the utility model, a threaded hole 16 is opened on the front side of the fixed block 1001 for use with the threaded rod 1003, the surface of the threaded rod 1003 is connected to the inner wall of the threaded hole 16 through a thread, and the rear side of the surface of the threaded rod 1003 is rotatably connected to the inner wall of the movable sleeve 1004 through a bearing.

In this embodiment: by setting the threaded hole 16, in order to allow the threaded rod 1003 to move through the thread and to locate the position of the threaded rod 1003 through the thread, the rear side of the surface of the threaded rod 1003 is rotatably connected with the inner wall of the movable sleeve 1004 through a bearing, in order to facilitate the rotation of the threaded rod 1003.

As a technical optimization solution of the utility model, a positioning slider 17 is fixedly connected to the bottom of the first clamping plate 1005, and a positioning groove 18 used in conjunction with the positioning slider 17 is opened on the top of the L-shaped plate 9, and the side of the positioning slider 17 close to the inner wall of the positioning groove 18 contacts the inner wall of the positioning groove 18.

In this embodiment, by providing the positioning slider 17 and the positioning slot 18, the position of the first clamping plate 1005 can be positioned so that the first clamping plate 1005 will not shake when moving.

Working principle: First, adjust the positions of the two L-shaped plates 9 according to the length of the steel structure, pull the pull ring 602, and the pull ring 602 drives the fixing rod 603 to move upward, so that the fixing rod 603 moves out of the inner cavity of the fixing hole 7 to cancel the fixation of the support sleeve 5, and at the same time, the limit plate 605 squeezes the first spring 604, and then the support sleeve 5 is moved on the surface of the support bar 4, the support sleeve 5 drives the connecting block 8 to move, and the connecting block 8 drives the L-shaped plate 9 to move to a suitable position, and then release the pull ring 602, through the first spring The force released after 604 is compressed drives the limit plate 605 to move downward, and the limit plate 605 drives the fixing rod 603 to move downward, so that the bottom of the fixing rod 603 moves to the inner cavity of the fixing hole 7 to fix the position of the support sleeve 5, and then the steel structure is placed on the top of the two L-shaped plates 9 and fits with the first baffle 1006, and then the crank 1002 is turned, and the crank 1002 drives the threaded rod 1003 to rotate, so that the threaded rod 1003 moves through the thread, and the threaded rod 1003 drives the movable sleeve 1004 to move, and the movable sleeve 1004 is moved. 004 drives the first clamping plate 1005 to move, and the first clamping plate 1005 is used to squeeze the steel structure, so that the steel structure is clamped and fixed by the two first clamping plates 1005 and the first baffle 1006, thereby achieving the effect of clamping steel structures of different lengths. When it is necessary to clamp a steel structure with a corner, the second clamping plate 1104 is pushed to squeeze the second spring 1103, and then one section of the spring is located between the second clamping plate 1104 and the second baffle. 1105, and the other section is located between the first clamping plate 1005 and the first baffle 1006, and then the first clamping plate 1005 is released, and the force released after the compression of the second spring 1103 produces a thrust on the first clamping plate 1005, so that the steel structure at one end is clamped by the second clamping plate 1104 and the second baffle 1105, and then the other section is clamped by the first clamping plate 1005 and the first baffle 1006 in the above manner, thereby achieving the effect of clamping the steel structure with a corner.

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

Claims (10)

1. A clamp for detecting welds of steel structures, comprising a base (1), characterized in that: a support column (2) is fixedly connected to the rear side of the top of the base (1), a support plate (3) is fixedly connected to the top of the front side of the support column (2), a support bar (4) is fixedly connected to the front side of the support plate (3), a support sleeve (5) is sleeved on both sides of the surface of the support bar (4), a fixing assembly (6) is arranged on the top of the support sleeve (5), a fixing hole (7) for use with the fixing assembly (6) is opened on the top of the support bar (4), a connecting block (8) is fixedly connected to the bottom of the support sleeve (5), an L-shaped plate (9) is fixedly connected to the bottom of the connecting block (8), a first clamping assembly (10) is arranged on the left side of the top of the L-shaped plate (9), and a second clamping assembly (11) is arranged on the right side of the top of the L-shaped plate (9); The fixing assembly (6) comprises a fixing shell (601), a pull ring (602), a fixing rod (603), a first spring (604) and a limiting plate (605); the bottom of the fixing shell (601) is fixedly connected to the top of the supporting sleeve (5); the top of the fixing rod (603) is fixedly connected to the bottom of the pull ring (602); the bottom of the fixing rod (603) sequentially passes through the fixing shell (601) and the supporting sleeve (5) and extends to the inner cavity of the fixing hole (7); the first spring (604) and the limiting plate (605) are sequentially sleeved on the surface of the fixing rod (603) from top to bottom; the top of the first spring (604) is fixedly connected to the top of the inner wall of the fixing shell (601); the bottom of the first spring (604) is fixedly connected to the top of the limiting plate (605); and the inner wall of the limiting plate (605) is fixedly connected to the surface of the fixing rod (603). 2. A clamp for steel structure weld detection according to claim 1, characterized in that: the first clamping assembly (10) includes a fixed block (1001), a crank (1002), a threaded rod (1003), a movable sleeve (1004), a first clamping plate (1005) and a first baffle (1006), the bottom of the fixed block (1001) is fixedly connected to the left side of the front side of the top of the L-shaped plate (9), the front side of the threaded rod (1003) is fixedly connected to the left side of the rear side of the crank (1002), the rear side of the threaded rod (1003) passes through the fixed block (1001) and extends to the inner cavity of the movable sleeve (1004), the front side of the first clamping plate (1005) is fixedly connected to the rear side of the movable sleeve (1004), and the bottom of the first baffle (1006) is fixedly connected to the rear side of the top of the L-shaped plate (9). 3. A clamp for steel structure weld detection according to claim 1, characterized in that: the second clamping assembly (11) includes a fixed plate (1101), a telescopic positioning rod (1102), a second spring (1103), a second clamping plate (1104) and a second baffle (1105), the bottom of the fixed plate (1101) is fixedly connected to the top of the L-shaped plate (9), the left side of the telescopic positioning rod (1102) is fixedly connected to the right side of the fixed plate (1101), the second spring (1103) is sleeved on the surface of the telescopic positioning rod (1102), the left side of the second clamping plate (1104) is fixedly connected to the right side of the telescopic positioning rod (1102), and the bottom of the second baffle (1105) is fixedly connected to the right side of the front side of the top of the L-shaped plate (9). 4. A clamp for steel structure weld detection according to claim 1, characterized in that: a reinforcing rib (12) is fixedly connected to the front side of the bottom of the support plate (3), and the reinforcing rib (12) is fixedly connected to the support column (2) on the side close to the support column (2). 5. A clamp for steel structure weld detection according to claim 1, characterized in that: both sides of the support bar (4) are fixedly connected to limit blocks (13), and the inner wall of the support sleeve (5) is slidably connected to the surface of the support bar (4). 6. A fixture for steel structure weld detection according to claim 1, characterized in that: the number of the fixing holes (7) is several and they are evenly opened on the top of the support bar (4). 7. A clamp for steel structure weld detection according to claim 1, characterized in that: the top and bottom of the fixed shell (601) are both provided with a movable opening (14) for use with the fixed rod (603), and the side of the surface of the fixed rod (603) close to the inner wall of the movable opening (14) contacts the inner wall of the movable opening (14). 8. A clamp for detecting welds of steel structures according to claim 1, characterized in that: a through hole (15) for use with a fixing rod (603) is provided at the top of the support sleeve (5), and a side of the surface of the fixing rod (603) close to the inner wall of the through hole (15) contacts the inner wall of the through hole (15). 9. A clamp for steel structure weld detection according to claim 2, characterized in that: a threaded hole (16) for use with a threaded rod (1003) is opened on the front side of the fixed block (1001), the surface of the threaded rod (1003) is connected to the inner wall of the threaded hole (16) by a thread, and the rear side of the surface of the threaded rod (1003) is rotatably connected to the inner wall of the movable sleeve (1004) by a bearing. 10. A clamp for steel structure weld detection according to claim 2, characterized in that: a positioning slider (17) is fixedly connected to the bottom of the first clamping plate (1005), a positioning groove (18) for use with the positioning slider (17) is provided on the top of the L-shaped plate (9), and the side of the positioning slider (17) close to the inner wall of the positioning groove (18) contacts the inner wall of the positioning groove (18).