CN-224231160-U - Tensile calibration tool for load sensor

Abstract

The utility model relates to a tensile 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 piece applies dynamic or static axial tensile load to the calibration sensor, and the reaction force of the moment loading piece is transmitted to the detection frame through the plane bearing. The planar bearing eliminates lateral force interference through a ball/roller structure, ensures that load is strictly transmitted to the load sensor of the installation area along the axial direction, and realizes high-precision calibration. The detection frame is further provided with a lower U-shaped plate and a lower detection plate to form an installation area of the parcel load sensor, and the transverse displacement is limited. The frame body is additionally provided with an upper U-shaped plate, and the upper U-shaped plate and the lower U-shaped plate are staggered to form a cross-shaped supporting frame, so that loads are dispersed, and stress concentration is avoided. An adjusting gap is arranged between the upper U-shaped plate and the lower U-shaped plate, and the sensor is adapted to sensors with different sizes. By arranging the plane bearing and calibrating the sensor, the lateral force or the lateral moment is eliminated, the high-precision force value is obtained, and the device has a simple integral structure and low cost.

Inventors

• HAN PENGFEI
• CHEN CHAO
• LU TONGQIANG

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 tensile calibration tool for the load sensor 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 is linked below the calibration sensor, the lower part of the plane bearing is linked with the detection frame, and an installation area which is distributed below the plane bearing and is used for installing the load sensor is arranged on the detection frame.
2. 2. The tensile calibration fixture of a load sensor according to claim 1, wherein the detection frame comprises a frame body and a lower U-shaped plate arranged below the frame body, the opening end of the lower U-shaped plate is fixedly connected with a lower detection plate, the upper middle part of the lower U-shaped plate is connected with the lower part of the plane bearing, and the lower U-shaped plate and the lower detection plate jointly encircle a mounting area for mounting the load sensor.
3. 3. The tensile calibration fixture of a load sensor according to claim 2, wherein the frame body comprises an upper U-shaped plate and an upper detection plate fixedly connected with the opening end of the upper U-shaped plate, the upper U-shaped plate and the upper detection plate jointly surround a working area, the middle part of the upper U-shaped plate transversely penetrates through an installation area, the middle part of the lower U-shaped plate transversely penetrates through the working area, the upper U-shaped plate and the lower U-shaped plate are arranged in a mutually staggered mode, the upper end of the moment loading piece is fixedly connected with the upper detection plate, the lower end of the moment loading piece is connected with the calibration sensor, the lower part of the calibration sensor is in linkage with a plane bearing, and the plane bearing is far away from the working end face of the calibration sensor and is connected with the lower U-shaped plate.
4. 4. The load sensor stretching calibration tool according to claim 3, wherein an adjusting gap is arranged between the upper U-shaped plate and the lower U-shaped plate.
5. 5. The tensile calibration fixture of a load sensor according to any one of claims 1 to 4, wherein a first threaded connection column is arranged in the middle of the upper end face of the planar bearing, a first connection hole is formed in the middle of the calibration sensor, the first threaded connection column is inserted into the lower portion of the first connection hole, a second threaded connection column is arranged at the lower end of the moment loading piece, and the second threaded connection column is inserted into the upper portion of the first connection hole.
6. 6. The tensile calibration fixture of a load sensor of 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 U-shaped plate, and the second connecting hole and the third connecting hole are detachably connected through a first fastener.
7. 7. The tensile calibration fixture of a load sensor according to claim 3, wherein a fourth connecting hole is formed in the middle of the upper U-shaped plate, a fifth connecting hole corresponding to the fourth connecting hole is formed in the middle of the lower detection plate, the fourth connecting hole is detachably connected with the upper portion of the load sensor through a second fastening piece, and the fifth connecting hole is detachably connected with the lower portion of the load sensor through a third fastening piece.

Description

Tensile calibration tool for load sensor Technical Field The utility model particularly relates to a tensile 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 in the calibration process, the installation error (such as non-strict coaxiality) of a hydraulic force application system or a 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 tensile 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 tensile calibration tool has the advantages of simple integral structure and low cost. The load sensor stretching calibration tool is characterized in that one end of the moment loading part is connected with a calibration sensor, a plane bearing which is coaxially arranged is linked below the calibration sensor, the lower part of the plane bearing is linked with the detection frame, and a mounting area which is distributed below the plane bearing and is used for mounting the load sensor is arranged on the detection frame. By adopting the technical scheme, dynamic or static axial tensile load is applied through a moment loading part (preferably a jack), the output end of the moment loading part is connected with a calibration sensor (serving as a reference sensor), and the applied force value (F 1) is measured in real time. The tensile load of the calibration sensor (measuring instrument) is transmitted to the detection frame through the plane bearing. The plane bearing adopts coaxial arrangement, the internal ball or roller structure of the plane bearing allows tiny rotation, lateral force (Fx/Fy) or moment (Mx/My) generated by installation errors, external vibration or dynamic load inertia is converted into rotational kinetic energy to dissipate, and tensile load is ensured to be strictly transmitted to the detection frame along the axial direction. The mounting area of the test frame holds a load cell which receives the pure axial force (Fz) transmitted by the planar bearing. 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 calibration 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 tensile calibration tooling for the load sensor can be further arranged that the detection frame comprises a frame body and a lower U-shaped plate arranged below the frame body, wherein the opening end of the lower U-shaped plate is fixedly connected with a lower detection plate, the upper part of the middle of the lower U-shaped plate is connected with the lower part of the plane bearing, and the lower U-shaped plate and the lower detection plate jointly encircle a mounting area for mounting the load sensor. By adopting the technical scheme, the moment loading part applies axial tensile load to the calibration sensor, and the tensile load output by the moment loading part is transmitted to the middle part of the lower U-shaped plate through the plane bearing. The balls or rollers in the plane bearing allow micro rotation, convert lateral force (Fx/Fy) or moment (Mx/My) into rotational energy dissipation, and ensur