Principle, application and maintenance precautions

2022-08-02
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Abstract: before the application of the pointer type torque wrench, some people did not know the principle of the pointer type torque wrench and its maintenance precautions, resulting in confusion. So what is the principle of the pointer torque wrench

pointer type torque wrench structure

it is composed of wrench rod, wrench head, indicator head, wrench handle, etc

principle of pointer torque wrench

its working principle is based on the principle of lever, with the wrench head as the fulcrum of the force point and the wrench rod as the force arm. When the force is applied, the force value will indicate the output value data under the pointer indication system

main use

pointer type torque wrench is a wrench with heavy needle and main needle dial torque measurement. It is used by inspectors to tighten screws, bolts and nuts, and determine the torque value of nuts, screws and other 3-element materials with higher volume energy density bolts through the indication of the pointer

maintenance precautions

1. Before each use, it needs to be verified to see whether it is accurate and normal. In case of any abnormal condition, it is necessary to send it to the measurement and maintenance personnel for adjustment and repair, and use it again after the maintenance is qualified

2. Since the pointer type torque wrench is a high-precision measurement, it cannot vibrate or impact during use

3. Do not place it with the workpiece or flammable and corrosive substances, which will affect its performance

4. Stop applying force after the torque reaches the set value

5. The measuring instruments shall be sent for inspection according to the periodic verification time, and shall be used after passing the inspection

common specifications of pointer torque wrench

at present, its common specifications are 0 to 30n m. Square tenon size is 12.7mm × 12.7mm,100N·m~300N·m; Square tenon size is 10mm × 10mm; 0~100N·m; Square tenon size is 12 7mm × 12.7mm。

measurement method

1. The pointer returns to zero

2. Turn the dial housing so that the main needle points to the zero position

3. Turn the heavy needle screw of the glass cover so that the heavy needle is at the required torque value. The purpose of this is that when the force is applied, the main needle can move with the heavy needle. Once the force is applied, the main needle can return to the zero position

4. When tightening the nut, it is necessary to align the opening of the torque wrench with the size of the nut plane, and put the nut at the bottom of the opening of the torque wrench without too much clearance to avoid damage to the nut surface

the above is the introduction of the specification principle, maintenance precautions and use method of the pointer torque wrench

before using the pointer type torque wrench, some people did not know and partially adjusted the original 1. The maximum experimental force of the pointer type torque wrench was 100kN. They did not know its maintenance precautions, so they were confused. So let me make a summary for you, hoping to help you

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