CN-224231161-U - Load sensor compression calibration tool

Abstract

The utility model relates to a compression calibration tool for a load sensor, which comprises a detection frame, a moment loading part, a calibration sensor and a plane bearing. The moment loading member applies a dynamic or static axial compressive load downwardly to the calibration sensor, which compressive load is transferred through the planar bearing to the load cell in the mounting area of the test frame. The planar bearing eliminates lateral force interference through the balls/rollers, ensuring that the compression load is transferred strictly in the axial direction. The detection frame comprises an upper detection plate and a lower detection plate which are arranged up and down symmetrically, a rigid frame is formed by connecting a plurality of groups of support rods, the layout of the support rods is optimized into an isosceles triangle, the structural stability is enhanced, and stress concentration is avoided. According to the utility model, the plane bearing and the calibration sensor are arranged, so that the lateral force or the lateral moment is eliminated, the high-precision force value is obtained, the whole structure is simple, and the cost is low.

Inventors

• HAN XIAOTIAN
• HU TAO
• CHE YINGHUI

Assignees

• 浙江亚之星汽车部件有限公司

Dates

Publication Date

20260512

Application Date

20250506

Claims (7)

1. 1. The load sensor compression calibration tool comprises a detection frame and a moment loading part which is arranged on the detection frame and is used for applying dynamic or static axial load, and is characterized in that one end of the moment loading part is connected with a calibration sensor, a plane bearing which is coaxially arranged with the calibration sensor is arranged below the detection frame, and a mounting area for mounting the load sensor is arranged between the plane bearing and the calibration sensor.
2. 2. The compression calibration tooling for the load sensor of claim 1, wherein the detection frame comprises an upper detection plate and a lower detection plate which are arranged up and down symmetrically, a plurality of groups of support rods which are parallel to each other and are arranged at intervals are arranged between the upper detection plate and the lower detection plate, the plane bearing is fixed on the upper end face of the lower detection plate, and the body of the moment loading part is fixed on the lower end face of the upper detection plate.
3. 3. The load sensor compression calibration tool according to claim 1 or 2 is characterized in that a first threaded connection column connected with a load sensor is arranged in the middle of the upper end face of the plane bearing, a second threaded connection column is arranged at the lower end of the moment loading piece, a first connection hole is formed in the middle of the calibration sensor, and the second threaded connection column is inserted above the first connection hole.
4. 4. The load sensor compression calibration tool according to claim 3, wherein a second connecting hole is formed in the middle of the lower end face of the planar bearing, a third connecting hole corresponding to the second connecting hole is formed in the middle of the lower detection plate, and the second connecting hole is connected with the second third connecting hole through a first fastener.
5. 5. The compression calibration tooling for the load sensor according to claim 2, wherein the upper detection plate is provided with a group of upper positioning holes corresponding to each group of support rods, the lower detection plate is provided with a group of lower positioning holes corresponding to each group of support rods, the upper end and the lower end of each support rod are provided with inner tapping holes, the inner tapping holes at the upper end of each support rod are connected with the upper positioning holes through second fasteners, and the inner tapping holes at the lower end of each support rod are connected with the lower positioning holes through third fasteners.
6. 6. The load sensor compression calibration tool according to claim 5, wherein 3 groups of support rods which are parallel to each other and are arranged at intervals are arranged between the upper detection plate and the lower detection plate, and the line connection of the central line points of the 3 groups of support rods forms an isosceles triangle.
7. 7. The load sensor compression calibration tool of claim 6, wherein the upper detection plate and the lower detection plate are circular.

Description

Load sensor compression calibration tool Technical Field The utility model particularly relates to a compression calibration tool for a load sensor. Background With the rapid development of industrial automation and precision detection technology, the load sensor is used as a core element for mechanical detection, and the calibration precision of the load sensor directly influences the reliability of equipment performance evaluation. Currently, calibration of load sensors mainly depends on high-precision dynamic testing equipment (such as a servo hydraulic testing machine), and the sensor is calibrated by simulating dynamic load. However, the prior art has the following prominent problems: Firstly, the lateral force and moment interference causes large calibration error, and during the calibration process, the installation error (such as non-strict coaxiality) of the hydraulic force application system or the clamping structure, and the inertial effect of external vibration or dynamic load can all introduce lateral force (F x/Fy) or moment (M x/My). These non-axial forces are transmitted directly to the sensor via a rigid connection, resulting in a deviation of the measured value from the true axial force (F z), severely affecting the calibration efficiency. Secondly, the equipment cost is high, a complex hydraulic or pneumatic system is required to be equipped for dynamic calibration, and the requirements on the test environment (such as vibration prevention and constant temperature) are severe, so that the equipment purchasing and maintenance cost is obviously increased. Disclosure of utility model Aiming at the defects in the prior art, the utility model provides the compression calibration tool for the load sensor, and the planar bearing and the calibration sensor are arranged to eliminate the lateral force or the lateral moment so as to obtain a high-precision force value, so that the compression calibration tool has the advantages of simple integral structure and low cost. The technical scheme is that the load sensor compression calibration tool comprises a detection frame and a moment loading piece which is arranged on the detection frame and is used for applying dynamic or static axial load, and is characterized in that one end of the moment loading piece is connected with a calibration sensor, a plane bearing which is coaxially arranged with the calibration sensor is arranged below the detection frame, and an installation area for installing the load sensor is arranged between the plane bearing and the calibration sensor. By adopting the technical scheme, the load sensor is positioned in the installation area, the lower end of the calibration sensor is connected with the load sensor, and the lower end of the load sensor is connected with the plane bearing. The moment loading piece (preferably a jack) applies dynamic or static axial compression load downwards, and the output end of the moment loading piece is connected with a calibration sensor (serving as a metering device) to measure the applied force value in real time. The calibration sensor directly transmits the compression load of the moment loading piece to the upper end of the load sensor. Meanwhile, the upper end of the moment loading piece is directly connected with the detection frame, so that the detection frame can generate upward compression load on the plane bearing, the plane bearing is coaxially arranged between the calibration sensor and the detection frame, and the internal balls/rollers of the plane bearing allow the calibration sensor to slightly rotate when being stressed, so that lateral force (Fx/Fy) or moment (Mx/My) generated by installation errors, external vibration or dynamic load inertia is converted into rotation kinetic energy to be dissipated, and the compression load is ensured to be strictly transmitted to the load sensor in the installation area of the detection frame along the axial direction. And comparing the data of the calibration sensor with the data of the load sensor, wherein the readings of the calibration sensor and the data of the load sensor are consistent, and the load sensor is qualified. According to the scheme, the plane bearing is arranged below the load sensor, so that the influence of lateral force interference on the calibration of the load sensor is avoided, and the high-precision industrial detection requirement is met. The complex calibration tool in the prior art is replaced by the symmetrical feedback of the double sensors, the whole structure is simple, clamping is convenient, and equipment cost is reduced. The load sensor compression calibration tool can be further arranged that the detection frame comprises an upper detection plate and a lower detection plate which are arranged in an up-down symmetrical mode, a plurality of groups of support rods which are parallel to each other and are arranged at intervals are arranged between the upper detection plate and the lower detection plate, t