A steel strand tensile test clamping device

Abstract

The utility model relates to a steel strand tensile test clamping device, which belongs to the technical field of clamping devices, and comprises a base, wherein the upper surface of the base is provided with a fixing groove, the inner cavity of the fixing groove is provided with a clamping mechanism for clamping the steel strand, and the left and right sides of the base are provided with fixing mechanisms for fixing the base; the clamping mechanism comprises two wedge blocks, two clamping blocks, four support blocks, two threaded rods, two screw sleeves, two connecting frames and a belt, and the two wedge blocks are arranged in the inner cavity of the fixing groove. The steel strand tensile test clamping device can place one end of the steel strand between the two clamping blocks when performing a tensile test on the steel strand, and can reduce the shear force and deflection force generated on the steel strand during the clamping process by arranging the wedge blocks, support blocks, threaded rods, screw sleeves, connecting frames and belts, thereby avoiding the breakage of the steel strand at the contact portion between the edge of the clamping block and the steel strand, thereby improving the accuracy and reliability of the test results.

Description

Technical Field

[0001] The utility model relates to the technical field of clamping devices, in particular to a steel strand tensile test clamping device. Background Art

[0002] In transportation projects, especially major transportation projects, it is necessary to use a testing machine to conduct tensile tests on the steel strands used. The test basis comes from the national standard requirements. For example, the national standard GB / T5224-2014 stipulates the production and test methods of steel strands for prestressed concrete. The test method complies with the provisions of GB / T228-2010 standard, that is, the two ends of the steel strand sample are directly clamped by the testing machine fixture and stretched until the sample breaks.

[0003] The shear force and deflection force generated by the existing steel strand tensile test clamping device during the clamping process can easily cause the steel strand to break at the contact part between the edge of the clamping block and the steel strand, thereby affecting the accuracy and reliability of the test results. Therefore, we propose a steel strand tensile test clamping device to solve the above problem. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model provides a steel strand tensile test clamping device, which has the advantages of high accuracy and reliability of test results, and solves the problem that the shear force and deflection force generated by the existing steel strand tensile test clamping device during the clamping process easily cause the steel strand to break at the contact part between the edge of the clamping block and the steel strand, thereby affecting the accuracy and reliability of the test results.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steel strand tensile test clamping device, comprising a base, a fixing groove is provided on the upper surface of the base, a clamping mechanism for clamping the steel strand is provided in the inner cavity of the fixing groove, and a fixing mechanism for fixing the base is provided on both the left and right sides of the base;

[0006] The clamping mechanism includes two wedge blocks, two clamping blocks, four supporting blocks, two threaded rods, two screw sleeves, two connecting frames and belts. The two wedge blocks are arranged in the inner cavity of the fixing groove, the two clamping blocks are fixed on the opposite side of the two wedge blocks, and the four supporting blocks are respectively fixed on the upper and lower sides of the left and right ends of the base. The threaded rod is rotatably connected to the opposite side of the upper and lower support blocks through bearings, the screw sleeve is threadedly connected to the threaded rod, the connecting frame is fixed on the right side of the screw sleeve and the other side is fixed to the wedge block, and the belt drive is connected to the bottom of the outer surface of the two threaded rods.

[0007] By adopting this technical solution, the shear force and deflection force generated on the steel strand during the clamping process can be reduced, the breakage of the steel strand at the contact part between the edge of the clamping block and the steel strand can be avoided, and the accuracy and reliability of the test results can be improved.

[0008] Furthermore, the cross-sectional shape of the fixing groove is an isosceles trapezoid, and the cross-sectional shape of the connecting frame is an L-shape.

[0009] By adopting this technical solution, the gap between the two clamping blocks is reduced during the upward movement of the clamping blocks.

[0010] Furthermore, sliders are fixed to the upper and lower ends of the two wedge blocks on the opposite sides, and slide grooves are opened on the opposite sides of the left and right side walls of the fixed groove cavity, and the size of the sliders is adapted to the size of the slide groove cavity.

[0011] By adopting this technical solution, the movement of the wedge block can be limited by the provided sliding block and sliding groove.

[0012] Furthermore, a limiting block is fixed on the back of the screw sleeve, and limiting grooves are provided on both left and right ends of the front side of the base, and the limiting block performs linear up and down motion in the inner cavity of the limiting groove.

[0013] By adopting this technical solution, the threaded sleeve can be limited by the provided limiting block and limiting groove, so that it can perform linear motion.

[0014] Furthermore, the cross-section of the clamping block is arc-shaped, and the two screw sleeves are located on the same horizontal line.

[0015] By adopting this technical solution, the clamp block adopts an arc-shaped design to better adapt to the shape of the steel strand and reduce the generation of shear force.

[0016] Furthermore, the fixing mechanism includes a connecting block, an insert rod and a turning handle, wherein the connecting block is fixed to the bottom of one side of the base, the insert rod is threadedly connected to the inner cavity of the connecting block, and the turning handle is fixed to the outer surface of the insert rod.

[0017] By adopting this technical solution, the base is fixed to the test bench, thereby preventing the base from moving when the tensile machine stretches the steel hinge wire, further improving the accuracy of the test.

[0018] Furthermore, a threaded hole is provided on the upper surface of the connection block, and the size of the inner cavity of the threaded hole is matched with the size of the insertion rod.

[0019] By adopting this technical solution, the insertion rod can be moved downward when rotating.

[0020] Furthermore, the length of the insertion rod in the vertical direction is greater than the length of the connecting block in the vertical direction.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0022] 1. The steel strand tensile test clamping device can place one end of the steel strand between two clamping blocks when conducting a tensile test on the steel strand. The arrangement of the wedge block, the support block, the threaded rod, the screw sleeve, the connecting frame and the belt can reduce the shear force and deflection force on the steel strand during the clamping process, avoid the breakage of the steel strand at the contact part between the edge of the clamping block and the steel strand, and improve the accuracy and reliability of the test results.

[0023] 2. Before the steel strand tensile test is carried out on the steel strand, the position of the base can be fixed by the cooperation between the connecting block, the plug rod, the turning handle and the connecting block, so that the base is fixed to the test bench, thereby avoiding the base from moving when the tensile machine stretches the steel strand, and further improving the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the clamping mechanism of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the base and part of the clamping mechanism of the utility model;

[0027] Figure 4 It is a schematic diagram of the fixing mechanism structure of the utility model.

[0028] In the figure: 1, base; 2, fixing groove; 3, clamping mechanism; 31, wedge block; 32, clamping block; 33, support block; 34, threaded rod; 35, screw sleeve; 36, connecting frame; 37, belt; 4, fixing mechanism; 41, connecting block; 42, plug rod; 43, turning handle; 44, threaded hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figure 1A steel strand tensile test clamping device in this embodiment includes a base 1, a fixing groove 2 is provided on the upper surface of the base 1, a clamping mechanism 3 for clamping the steel strand is provided in the inner cavity of the fixing groove 2, and fixing mechanisms 4 for fixing the base 1 are provided on the left and right sides of the base 1.

[0031] In this embodiment, the cross-sectional shape of the fixing groove 2 is an isosceles trapezoid.

[0032] See also Figure 2-3 In order to reduce the shear force and deflection force on the steel strand during the clamping process, the clamping mechanism 3 in this embodiment includes two wedge blocks 31, two clamping blocks 32, four support blocks 33, two threaded rods 34, two screw sleeves 35, two connecting frames 36 and belts 37. The two wedge blocks 31 are arranged in the inner cavity of the fixing groove 2, the two clamping blocks 32 are fixed on the opposite side of the two wedge blocks 31, the four support blocks 33 are respectively fixed on the upper and lower sides of the left and right ends of the base 1, and the threaded rods 34 are on the opposite side of the upper and lower ends of the support blocks 33. The two sides are rotatably connected by a bearing, the screw sleeve 35 and the threaded rod 34 are threadedly connected, the connecting frame 36 is fixed to the right side of the screw sleeve 35 and the other side is fixed to the wedge block 31, the belt 37 is transmission-connected to the bottom of the outer surface of the two threaded rods 34, one end of the steel hinge wire is placed between the opposite sides of the two clamping blocks 32, and one of the threaded rods 34 is rotated. The rotation of one of the threaded rods 34 can drive the other threaded rod 34 to rotate through the belt 37, and the rotation of the two threaded rods 34 causes the screw sleeve 35 threadedly connected to its surface to move upward.

[0033] In this embodiment, the cross-sectional shape of the connecting frame 36 is L-shaped, and sliders are fixed on the upper and lower ends of the two wedge blocks 31 on the opposite sides. Slide grooves are opened on the opposite sides of the left and right side walls of the inner cavity of the fixed groove 2. The size of the slider is adapted to the size of the inner cavity of the slide groove. When the wedge block 31 moves, the slider fixed on one side moves in the inner cavity of the slide groove, which can limit the movement of the wedge block 31.

[0034] It can be understood that the movement of the two screw sleeves 35 synchronously drives the two connecting frames 36 to move upward, which in turn enables the wedge block 31 to drive the clamping block 32 to move upward, so that the gap between the two clamping blocks 32 is reduced during the upward movement until the steel hinge wire is clamped and fixed, and then the steel hinge wire can be tensile tested by a tensile machine.

[0035] Among them, a limiting block is fixed on the back of the screw sleeve 35, and limiting grooves are provided on the left and right ends of the front side of the base 1. The limiting block makes linear movements up and down in the inner cavity of the limiting groove. When the screw sleeve 35 moves, the limiting block fixed on the back thereof moves upward in the inner cavity of the limiting groove, which can limit the movement of the screw sleeve 35 so that it can only move in a straight line. The cross-sectional shape of the clamping block 32 is an arc, and the two screw sleeves 35 are located on the same horizontal line.

[0036] It should be noted that the shape of the clamp block 32 is arc-shaped, which can better adapt to the shape of the steel strand and reduce the generation of shear force.

[0037] See also Figure 4 In order to fix the base 1, the fixing mechanism 4 in this embodiment includes a connecting block 41, an insert rod 42 and a turning handle 43. The connecting block 41 is fixed to the bottom of one side of the base 1, and the insert rod 42 is threadedly connected to the inner cavity of the connecting block 41. The blocks with two slots on the upper surfaces are fixed to the test bench by bolts. The inner cavity of the slot is provided with threads. Then the base 1 is placed between the blocks, and the turning handle 43 is turned. The rotation of the turning handle 43 causes the insert rod 42 to rotate, and the turning handle 43 is fixed to the outer surface of the insert rod 42.

[0038] In this embodiment, a threaded hole 44 is formed on the upper surface of the connecting block 41 . The size of the inner cavity of the threaded hole 44 matches the size of the insertion rod 42 . The length of the insertion rod 42 in the vertical direction is greater than the length of the connecting block 41 in the vertical direction.

[0039] It can be understood that under the action of the threaded hole 44, the insertion rod 42 moves downward in the inner cavity of the connecting block 41 until the bottom of the insertion rod 42 is screwed into the inner cavity of the block, thereby fixing the insertion rod 42 to the block, thereby fixing the base 1 and improving the stability of the base 1.

[0040] The working principle of the above embodiment is:

[0041] (1) When performing a tensile test on a steel hinge wire, the base 1 needs to be fixed. First, two blocks with slots on the upper surfaces are fixed to the test bench by bolts. The inner cavity of the slots is provided with threads. Then, the base 1 is placed between the blocks and the handle 43 is turned. The rotation of the handle 43 causes the insertion rod 42 to rotate. Then, under the action of the threaded hole 44, the insertion rod 42 moves downward in the inner cavity of the connecting block 41 until the bottom of the insertion rod 42 is screwed into the inner cavity of the block. The insertion rod 42 can be fixed to the block, thereby fixing the base 1 and improving the stability of the base 1.

[0042] (2) Then place one end of the steel hinge wire between the opposite sides of the two clamping blocks 32 and rotate one of the threaded rods 34. The rotation of one of the threaded rods 34 can drive the other threaded rod 34 to rotate through the belt 37. The rotation of the two threaded rods 34 causes the screw sleeve 35 threadedly connected on its surface to move upward. When the screw sleeve 35 moves, the limit block fixed on the back side moves upward in the inner cavity of the limit groove, which can limit the movement of the screw sleeve 35 so that it can only move in a straight line. The movement of the two screw sleeves 35 simultaneously drives the two connecting frames 36 to move upward, and then the wedge block 31 can drive the clamping block 32 to move upward. At this time, the sliding block fixed on one side of the wedge block 31 moves in the inner cavity of the slide groove, which can limit the movement of the wedge block 31, so that the gap between the two clamping blocks 32 is reduced during the upward movement until the steel hinge wire is clamped and fixed. Then, the steel hinge wire can be subjected to a tensile test through a tensile machine.

Claims

1. A steel strand tensile test clamping device, comprising a base (1), characterized in that: The upper surface of the base (1) is provided with a fixing groove (2), the inner cavity of the fixing groove (2) is provided with a clamping mechanism (3) for clamping the steel strand, and the left and right sides of the base (1) are both provided with fixing mechanisms (4) for fixing the base (1); The clamping mechanism (3) comprises two wedge blocks (31), two clamping blocks (32), four support blocks (33), two threaded rods (34), two screw sleeves (35), two connecting frames (36) and a belt (37). The two wedge blocks (31) are arranged in the inner cavity of the fixing groove (2), the two clamping blocks (32) are fixed on opposite sides of the two wedge blocks (31), the four support blocks (33) are respectively fixed on upper and lower sides of left and right ends of the base (1), the threaded rod (34) is rotatably connected to opposite sides of the support blocks (33) at the upper and lower ends via a bearing, the screw sleeve (35) is threadedly connected to the threaded rod (34), the connecting frame (36) is fixed on the right side of the screw sleeve (35) and the other side is fixed to the wedge block (31), and the belt (37) is drivingly connected to the bottom of the outer surface of the two threaded rods (34).

2. A steel strand tensile test clamping device according to claim 1, characterized in that: The cross-sectional shape of the fixing groove (2) is an isosceles trapezoid, and the cross-sectional shape of the connecting frame (36) is an L-shape.

3. A steel strand tensile test clamping device according to claim 1, characterized in that: Slide blocks are fixed at the upper and lower ends of the opposite sides of the two wedge blocks (31), and slide grooves are opened on the opposite sides of the left and right side walls of the inner cavity of the fixed groove (2), and the size of the slide block is compatible with the size of the inner cavity of the slide groove.

4. A steel strand tensile test clamping device according to claim 1, characterized in that: A limiting block is fixed on the back of the screw sleeve (35), and limiting grooves are provided on both left and right ends of the front of the base (1), and the limiting block performs linear up and down motion in the inner cavity of the limiting groove.

5. A steel strand tensile test clamping device according to claim 1, characterized in that: The cross-section of the clamping block (32) is arc-shaped, and the two screw sleeves (35) are located on the same horizontal line.

6. A steel strand tensile test clamping device according to claim 1, characterized in that: The fixing mechanism (4) comprises a connecting block (41), an insert rod (42) and a turning handle (43); the connecting block (41) is fixed to the bottom of one side of the base (1); the insert rod (42) is threadedly connected to the inner cavity of the connecting block (41); and the turning handle (43) is fixed to the outer surface of the insert rod (42).

7. A steel strand tensile test clamping device according to claim 6, characterized in that: A threaded hole (44) is provided on the upper surface of the connection block (41), and the size of the inner cavity of the threaded hole (44) is compatible with the size of the insertion rod (42).

8. A steel strand tensile test clamping device according to claim 6, characterized in that: The length of the insertion rod (42) in the vertical direction is greater than the length of the connecting block (41) in the vertical direction.

Images