CN202548009U - Bolt shearing test clamp - Google Patents

Abstract

The utility model relates to a bolt shearing test clamp comprising an upper clamping device, a lower clamping device and a plastic gasket, wherein each one of the upper clamping device and the lower clamping device is formed by a connecting piece and a clamping plate, and each connecting piece is of a rectangular columnar structure; dovetail iron is arranged on the two opposite sides of each connecting piece and is matched with dovetail grooves of a testing machine to be used for fixing the clamping devices on the testing machine; each clamping plate is of a plate-shaped structure, is located at the top of each connecting piece and is provided with a bolt hole; one side of the clamping plate of the upper clamping device is downward, and the side of the clamping plate of the lower clamping device is upward; and the upper clamping device and the lower clamping device are matched with each other. According to the bolt shearing test clamp disclosed by the utility model, bolts are clamped by the bolt holes of the upper clamping device and the lower clamping device of the clamp, and then a detection test of shearing stress of the bolts is finished. The bolt shearing test clamp is used for simulating an actual operation condition of the bolts to test an anti-shearing capability of the bolts, and is good for adjusting and controlling the quality of the bolts and improving the reliability of bolt connection of a power grid iron tower.

Description

A bolt shear test fixture

technical field

The utility model belongs to the technical field of mechanical part processing and detection, and relates to a fixture for a universal testing machine, in particular to a bolt shear test fixture.

technical background

As the most commonly used fasteners, bolts are widely used in the connection and fixation of engineering structures, and the connection of power grid towers is bolted. The bolts are subjected to shear stress on the connection of the iron tower. After frequent vibrations cause the bolts to loosen, the stability of the iron tower structure is mainly borne by the shear resistance of the bolts. Once the bolts loosen and fall off, other bolts will bear greater shear stress. , the strength of bolts is directly related to the safe operation of the iron tower, so testing the shear resistance of bolts is extremely important to the safety of power grid transmission.

Factors affecting the bolt shear force include the material, thickness, hole diameter, and clearance of the upper and lower plates of the connector. In order to test the shear stress of the tower bolts, it is necessary to design a fixture suitable for the bolt shear test.

Contents of the invention

The purpose of this utility model is to provide a bolt shear test fixture, which is used to test the shear stress of iron tower bolts, so as to ensure that the quality of the bolts is qualified and the connection of the power grid iron tower bolts is safe and reliable.

The utility model relates to a bolt shearing test fixture, which comprises an upper clamper and a lower clamper. The upper holder and the lower holder are composed of connecting pieces and splints respectively. The connecting piece is a rectangular column structure, and the opposite sides of the connecting piece are provided with dovetail irons. The dovetail irons are matched with the dovetail slots of the testing machine to fix the holder on the testing machine. The splint is a plate-shaped structure, located on the top of the connecting piece, and the splint is provided with bolt holes. The splint side of the upper gripper faces down and the splint side of the lower gripper faces up. The upper and lower grippers cooperate with each other.

The splints of the upper and lower holders are respectively located on one side of the central line of the connecting piece. The bolt shear test fixture is also provided with a gasket, which is located in the middle of the upper holder and the lower holder, and the gasket is a plastic gasket. The function of the washer is mainly to avoid friction between the two fixtures after the nut is tightened, which will affect the test results.

The aperture of the bolt hole is 13.5mm, 17.5mm, 21.5mm or 25.5mm, and the bolt aperture of other sizes is also the scope of protection of the utility model. The bolt shear test fixture is installed on the wedge-shaped fixture of the universal testing machine. The bolt shear test fixture is equipped with a safety net, which is installed on the front and rear sides of the testing machine with magnet adsorption.

The utility model installs the bolt shear test fixture on the basis of the wedge-shaped fixture of the ordinary universal testing machine, and clamps the bolt through the bolt holes of the upper and lower clamps of the fixture to realize the detection test of the bolt shear stress. The utility model is used to simulate the actual operating conditions of the bolts and test the shearing resistance of the bolts, which is beneficial to adjusting and controlling the quality of the bolts and improving the reliability of the bolt connection of the grid iron tower. The utility model has the advantages of simple structure and convenient use, and can be used as a fixture for stress detection tests of various bolts.

Description of drawings

Fig. 1 is a schematic diagram of a bolt shear test fixture of the present invention;

Fig. 2 is the structural representation of upper holder;

Fig. 3 is a side view of Fig. 2;

Fig. 4 is the structural representation of lower holder;

Fig. 5 is a side view of Fig. 4;

Figure 6 is a schematic diagram of safety net installation.

in:

1—lower holder, 2—upper holder, 3—washer, 4—connector, 5—dovetail iron, 6—splint, 7—bolt hole, 8—nut, 9—bolt, 10—magnet, 11 -safe net.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

The utility model bolt shear test fixture is shown in Figure 1, comprises upper clamper 2, lower clamper 1 and plastic washer 3, and plastic washer is positioned at the middle of upper clamper and lower clamper. As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the upper holder and the lower holder have the same structure, and the directions of use are opposite and different. The connecting piece is a rectangular column structure, and the opposite sides of the connecting piece are provided with dovetail irons 5 . The bolt shear test fixture is installed on the universal testing machine with a wedge-shaped fixture, and the dovetail iron is matched with the dovetail groove on the universal testing machine to fix the clamp on the testing machine. The splint is a plate-shaped structure, which is arranged on the top of the connecting piece and on one side of the center line of the connecting piece. A bolt hole 7 is provided on the splint, and the bolt hole is located on the center line. The diameter of the bolt hole is 13.5 mm, and is used for detecting and testing M12 bolts. One side of the splint 6 of the upper clamper faces downward, one side of the splint of the lower clamper faces upward, and the middle bolt holes are aligned.

The usage method of the present utility model is that the upper holder 2 and the lower holder 1 are installed on the universal testing machine, the bolt 9 is passed through the bolt holes 7 of the upper and lower holders, and the plastic gasket 3 is installed on the two holders. Between the devices, tighten the nut 8 to the torque required for the test. As shown in Figure 7, the safety net 11 is installed on the front and rear sides of the testing machine by adsorption with a magnet 10, so as to prevent the bolt from flying out and hurting people after the bolt breaks. Start the testing machine, conduct the test according to the test requirements to detect the shear force of the bolts, and record the test results.

Claims (7)

1. A bolt shear test fixture, including an upper gripper (2) and a lower gripper (1), characterized in that: the upper gripper and the lower gripper are respectively composed of connecting parts (4) and It is composed of a splint (6), the connecting piece is a rectangular column structure, and dovetail irons (5) are arranged on opposite sides of the connecting piece; the splint is a plate-shaped structure, located on the top of the connecting piece, and there are bolt holes on the splint (7); One side of the splint (6) of the upper holder faces down, and one side of the splint of the lower holder faces up. 2. The bolt shear test fixture according to claim 1, characterized in that: the splint (6) is located on one side of the centerline of the connecting piece (4). 3. The bolt shear test fixture according to claim 2, characterized in that: the bolt shear test fixture is also provided with a washer (3), and the washer is located on the upper holder (2) and the lower holder (1 )in the middle. 4. The bolt shear test fixture according to claim 3, characterized in that: the washer (3) is a plastic washer. 5. The bolt shear test fixture according to any one of claims 1-4, characterized in that: the diameter of the bolt hole (7) is 13.5mm, 17.5mm, 21.5mm or 25.5mm. 6. The bolt shear test fixture according to claim 6, characterized in that: the bolt shear test fixture is installed on a wedge-shaped fixture of a universal testing machine. 7. The bolt shear test fixture according to claim 7, characterized in that: the bolt shear test fixture is provided with a safety net (11), and the safety net is attached to the front and rear of the testing machine by adsorption with a magnet (10) two sides.

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