Fixture for measuring torsion angle of longitudinal rib of deformed steel bar

Abstract

A clamp for measuring the torsion angle of a deformed steel bar longitudinal rib comprises an inspection rack and a cylinder support, the cylinder support is installed on the inspection rack, a cylinder is installed above one side of the cylinder support, a compression spring is arranged at the front end of a cylinder piston head, a connecting steel plate is welded to the tail end of the compression spring, one side of the connecting steel plate is connected with an upper clamping plate, and the other side of the connecting steel plate is connected with a lower clamping plate. The upper clamping plate is provided with an upper groove, the inspection rack is provided with a lower clamping plate, and the lower clamping plate is provided with a lower groove. The clamp has the advantages that the clamp is installed at the head end of an inspection rack, the head end of the deformed steel bar is fixed in the horizontal direction of a longitudinal rib, and a measurer can independently measure the torsion angle at the tail end of the deformed steel bar, so that single-person operation is achieved, more convenience is achieved, deviation caused by manual fixing of the head end of the deformed steel bar can be eliminated at the same time, and the measuring efficiency is improved. And economy and reliability are realized. The clamp can be suitable for clamping deformed steel bars of different specifications by replacing the upper clamping plate and the lower clamping plate, and detection efficiency and accuracy can be effectively improved.

Description

Technical Field

[0001] This utility model relates to a clamp, specifically a clamp for measuring the torsion angle of the longitudinal ribs of threaded steel. Background Technology

[0002] The longitudinal ribs of rebar are two uniform and continuous raised ribs parallel to the axis of the rebar. The longitudinal ribs of rebar can increase the adhesion between the rebar and the concrete, thereby improving the interaction between the rebar and the concrete and enabling it to better withstand the action of external forces.

[0003] During the rolling process of rebar, the matrix undergoes natural torsion, resulting in helical twisting of the longitudinal ribs. This twisting of the longitudinal ribs does not affect the quality of the rebar. However, when using large-diameter rebar to manufacture ring-shaped components, if the twisting angle of the longitudinal ribs is greater than 30°, the spatial dislocation at both ends of the rebar after bending and forming is significant, making it difficult to weld the ends together smoothly. To meet the processing requirements of this special-purpose rebar, the twisting angle of the longitudinal ribs of the rebar must be controlled to ≤30° along the entire length.

[0004] The existing method for measuring the torsion angle of the longitudinal ribs of threaded steel bars involves one person placing and fixing the longitudinal rib at the beginning of the bar horizontally, while another person uses a protractor to measure the angle between the longitudinal rib at the end of the bar and the horizontal line. This angle is the torsion angle of the longitudinal rib. This method requires two people to work together, resulting in high labor costs. Moreover, manually placing and fixing the longitudinal rib at the beginning of the bar horizontally often makes it difficult to ensure that the rib is horizontal, leading to large measurement errors (above ±5°), which is quite inconvenient. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings and defects of existing technologies by providing a fixture for measuring the torsion angle of the longitudinal ribs of rebar. This fixture is installed at the head of the inspection stand, fixing the head of the rebar horizontally along the longitudinal rib direction. This allows the measuring operator to independently measure the torsion angle at the end of the rebar, enabling single-person operation, which is more convenient and eliminates deviations caused by manually fixing the head of the rebar, making it more economical and reliable. This fixture can be adapted to hold rebar of different specifications by changing the upper and lower clamping plates, effectively improving inspection efficiency and accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a fixture for measuring the torsion angle of longitudinal ribs of threaded steel, comprising an inspection frame and a cylinder support. The cylinder support is mounted on the inspection frame, and a cylinder is mounted on the upper side of one side of the cylinder support. A compression spring is provided at the front end of the cylinder piston head, and a connecting steel plate is welded to the end of the compression spring. An upper clamping plate is connected to one side of the connecting steel plate, and an upper groove is provided on the upper clamping plate. A lower clamping plate is mounted on the inspection frame, and a lower groove is provided on the lower clamping plate. The upper groove and the lower groove correspond to and cooperate with each other.

[0007] Furthermore, the upper clamping plate and the lower clamping plate adopt a semi-circular groove split structure.

[0008] Furthermore, threaded mounting holes are provided on both sides of the upper clamping plate, and connecting bolts are provided on the connecting steel plate. The upper clamping plate is connected to the connecting steel plate by the connecting bolts.

[0009] Furthermore, the middle part of the lower clamping plate is located directly below the middle part of the upper clamping plate.

[0010] The working principle of this invention is as follows: When measuring the torsion angle of the longitudinal ribs of a rebar, the operator places the rebar into the lower groove of the lower clamping plate with the non-ribbed part horizontal. Then, a cylinder drives the upper clamping plate downwards. At this time, the protruding longitudinal ribs of the rebar will push up the upper clamping plate, while the compression spring of the cylinder piston head is in a compressed state. Continuing to rotate the rebar, when the longitudinal ribs are horizontal, the upper clamping plate, under the action of the compression spring, works together with the lower clamping plate to fix the rebar in a horizontal position, preventing further rotation. At this point, the longitudinal rib at the beginning of the rebar is in a horizontal position. The operator then only needs to measure the angle between the longitudinal rib at the end of the rebar and the horizontal line; this angle is the torsion angle of the longitudinal ribs. When measuring rebar of different specifications, the operator only needs to replace the upper and lower clamping plates with the corresponding sizes.

[0011] The beneficial effects of this utility model after adopting the above technical solution are as follows: By installing this clamp at the first end of the inspection bench and fixing the first end of the threaded steel bar horizontally along the longitudinal rib direction, the measuring personnel can independently complete the measurement of the torsion angle at the end of the steel bar, thereby realizing single-person operation, which is more convenient and can also eliminate the deviation caused by manually fixing the first end of the steel bar, making it more economical and reliable. This clamp can be adapted to clamp threaded steel bars of different specifications by changing the upper and lower clamping plates, which can effectively improve the testing efficiency and accuracy. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the upper and lower clamping plates in this utility model.

[0015] Figure 3 This is a schematic diagram of the working state of this utility model.

[0016] Figure 4 yes Figure 3 Enlarged structural diagram at point A in the middle.

[0017] Explanation of reference numerals in the attached drawings: 1. Inspection stand; 2. Cylinder support; 3. Cylinder; 4. Compression spring; 5. Upper clamping plate; 6. Lower clamping plate; 7. Connecting steel plate; 8. Upper groove; 9. Lower groove; 501. Threaded mounting hole; 701. Connecting bolt. Detailed Implementation

[0018] See Figures 1-4 As shown, the technical solution adopted in this specific embodiment is as follows: it includes an inspection table 1 and a cylinder support 2. The cylinder support 2 is installed on the inspection table 1. A cylinder 3 is installed on the upper side of one side of the cylinder support 2. A compression spring 4 is provided at the front end of the piston head of the cylinder 3, and a connecting steel plate 7 is welded to the end of the compression spring 4. An upper clamping plate 5 is connected to one side of the connecting steel plate 7. An upper groove 8 is provided on the upper clamping plate 5. A lower clamping plate 6 is installed on the inspection table 1. A lower groove 9 is provided on the lower clamping plate 6. The upper groove 8 and the lower groove 9 correspond to and cooperate with each other.

[0019] More specifically, the upper clamping plate 5 and the lower clamping plate 6 adopt a semi-circular groove split structure. The upper clamping plate 5 moves downward under the drive of the cylinder 3, and cooperates with the lower clamping plate 6 to form a closed structure, thereby forming a circular clamping cavity with the upper groove 8 and the lower groove 9. The inner wall radius R of the upper groove 8 and the lower groove 9 matches the nominal diameter of the threaded steel to be tested, which can be applied to threads of different specifications such as Φ28mm and Φ32mm.

[0020] More specifically, the upper clamping plate 5 has threaded mounting holes 501 on both sides, and the connecting steel plate 7 is provided with connecting bolts 701. The upper clamping plate 5 is connected to the connecting steel plate 7 via the connecting bolts 701. Using the connecting bolts 701 to quickly install the upper clamping plate 5 onto the connecting steel plate 7 not only ensures the installation speed of the upper clamping plate 5, but also facilitates the replacement of upper clamping plates 5 of different sizes by the staff.

[0021] More specifically, the middle part of the lower clamping plate 6 is located directly below the middle part of the upper clamping plate 5. This allows the upper clamping plate 5 and the lower clamping plate 6 to clamp each other more effectively, with the upper groove 8 and the lower groove 9 holding the threaded steel bars more firmly.

[0022] The working principle of this invention is as follows: When measuring the torsion angle of the longitudinal ribs of a rebar, the operator places the rebar into the lower groove 9 of the lower clamping plate 6 with the non-horizontal ribs at a horizontal position. Then, the cylinder 3 drives the upper clamping plate 5 downwards. At this time, the protruding longitudinal ribs of the rebar will push up the upper clamping plate 5, while the compression spring 4 of the piston head of the cylinder 3 is in a compressed state. Continuing to rotate the rebar, when the longitudinal ribs are horizontal, the upper clamping plate 5, under the action of the compression spring 4, works together with the lower clamping plate 6 to fix the rebar in a horizontal position, preventing further rotation. At this point, the longitudinal ribs at the beginning of the rebar are in a horizontal position. Then, the operator only needs to measure the angle between the longitudinal rib at the end of the rebar and the horizontal line; this angle is the torsion angle of the longitudinal ribs. When measuring rebars of different specifications, the operator only needs to replace the upper clamping plate 5 and the lower clamping plate 6 with the corresponding sizes.

[0023] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A fixture for measuring the angle of twist of longitudinal ribs of threaded steel, comprising a testing bench (1) and a cylinder support (2) mounted on the testing bench (1), characterized in that: A cylinder (3) is installed above one side of the cylinder support (2). A compression spring (4) is provided at the front end of the piston head of the cylinder (3), and a connecting steel plate (7) is welded to the end of the compression spring (4). An upper clamping plate (5) is connected to one side of the connecting steel plate (7). An upper groove (8) is provided on the upper clamping plate (5). A lower clamping plate (6) is installed on the inspection table (1). A lower groove (9) is provided on the lower clamping plate (6). The upper groove (8) and the lower groove (9) are correspondingly matched.

2. The fixture for measuring the longitudinal rib torsion angle of screw thread steel according to claim 1, characterized in that: The upper clamping plate (5) and the lower clamping plate (6) adopt a semi-circular groove split structure.

3. The fixture for measuring the longitudinal rib torsion angle of screw thread steel according to claim 1, characterized in that: The upper clamping plate (5) has threaded mounting holes (501) on both sides, and the connecting steel plate (7) is provided with connecting bolts (701). The upper clamping plate (5) is connected to the connecting steel plate (7) through the connecting bolts (701).

4. The fixture for measuring the longitudinal rib torsion angle of screw thread steel according to claim 1, characterized in that: The middle part of the lower clamping plate (6) is located directly below the middle part of the upper clamping plate (5).

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