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Improvements to the calibration device for horizontal tensile testing machines
Category: Industry News
The tensile direction of the horizontal tensile testing machine is horizontal, and currently, two calibration methods are used: steel wire rope connection and reaction frame structure. During the calibration process, the following three problems were found: the calibration device cannot guarantee that the stress axis of the testing machine coincides with the stress axis of the standard tensile sensor, resulting in coaxiality error; the calibration device using the reaction frame structure, due to the lack of a flat support platform, makes it difficult to place the standard pressure sensor. The connection head of the steel wire rope connection calibration device is not standardized, the estimation of the breaking force is insufficient, it is easy to cause breakage, and there is a safety hazard. Below, an improved calibration device for a horizontal tensile testing machine is introduced, which uses reasonable auxiliary equipment to effectively solve the above problems.
Reasons for and error analysis of the misalignment of the stress axis: The method of steel wire rope link calibration is to use a single steel wire rope, and a connector connected in series with the standard sensor and load sensor of the horizontal tensile testing machine is used to calibrate the force value. This calibration method is equivalent to simulating product testing and is a direct and effective method for calibrating the indicated value. However, there is a gap at the joint when the standard tensile sensor, steel wire rope, and testing machine are connected, causing the tensile or pressure sensor to shift, and the displacement of the position causes a coaxiality error between the force axes.
Reasonable selection of joints to eliminate coaxiality error: Ring hinges or pin joints can be used at both ends of the tensile testing machine and the standard tensile sensor. When using pin joints, due to the different loads borne by steel wire ropes of different diameters, there will be a certain gap at the connection. In order to prevent the steel wire rope joint from shifting on the pin joint, a clamping bolt positioning device is used to eliminate the coaxiality introduced. The limit bolt consists of a conical plug and a connecting rod. 0.5 millimeters, a limit clamp is inserted into the gap of the joint to limit the left and right displacement of the steel wire rope joint.
The active slider of the horizontal tensile testing machine is connected to the active frame connector of the reaction frame, and the passive slider is connected to the passive frame connector of the reaction frame. The sliding support of the active frame is placed on the lower steel column of the passive frame. The hoist is placed on the frame of the horizontal testing machine, and the hoist and hoist ring are connected by a flexible rope. The passive frame is adjusted to a horizontal position through the wire adjustment device on the hoist. The sensor is placed on the flexible rope, and under the action of gravity, the central axis of the sensor will be placed on the vertical central plane of the two columns of the reaction frame, and then the length of the steel wire rope will be adjusted by the wire adjustment device to move the horizontal position of the sensor center axis.
Using the above method, the online calibration problem of horizontal tensile testing machines with different ranges can be solved. By adjusting the clamping position and position, the line of action of the loading force can be ensured to coincide with the stress axis of the tension sensor, ensuring the accuracy of the calibration of the indicated value and avoiding safety hazards caused by steel wire rope breakage and eccentric installation.
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