Tensile calibration tool for load sensor

Abstract

The utility model relates to a tensile calibration tool for a load sensor. The tensile calibration tool comprises a detection frame, a torque loading piece, a calibration sensor and a plane bearing, the torque loading piece applies a dynamic or static axial tensile load to the calibration sensor, and the counter-acting force of the torque loading piece is transmitted to the detection frame through the plane bearing. The plane bearing eliminates lateral force interference through a ball / roller structure, it is ensured that loads are strictly transmitted to a load sensor in an installation area in the axial direction, and high-precision calibration is achieved. The detection frame is further provided with a lower U-shaped plate and a lower detection plate to form an installation area for wrapping the load sensor, and transverse displacement is limited. The upper U-shaped plates are additionally arranged on the frame body and staggered with the lower U-shaped plates to form a cross-shaped supporting frame, loads are dispersed, and stress concentration is avoided. An adjusting gap is arranged between the upper and lower U-shaped plates to adapt to sensors of different sizes. By arranging the plane bearing and the calibration sensor, the lateral force or the lateral torque is eliminated, the high-precision force value is obtained, the overall structure is simple, and the cost is low.

Description

Technical Field

[0001] This utility model specifically relates to a load sensor tensile calibration fixture. Background Technology

[0002] With the rapid development of industrial automation and precision testing technologies, load cells, as core components of mechanical testing, directly affect the reliability of equipment performance evaluation through their calibration accuracy. Currently, load cell calibration mainly relies on high-precision dynamic testing equipment (such as servo hydraulic testing machines) to calibrate the sensors by simulating dynamic loads. However, existing technologies have the following prominent problems:

[0003] First, lateral force and torque interference lead to large calibration errors. During the calibration process, installation errors of the hydraulic force application system or clamping structure (such as non-strict coaxiality), external vibration, or the inertial effect of dynamic loads will all introduce lateral forces (F). x / F y ) or torque (M) x / My). These non-axial forces are transmitted directly to the sensor through a rigid connection, causing the measured value to differ from the true axial force (F). z This can cause deviations and seriously affect calibration efficiency.

[0004] Secondly, the equipment is expensive. Dynamic calibration requires a complex hydraulic or pneumatic system and has stringent requirements for the testing environment (such as vibration protection and constant temperature), which leads to a significant increase in equipment procurement and maintenance costs. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a load sensor tension calibration fixture to address the shortcomings of the prior art. By setting up a plane bearing and a calibration sensor, lateral force or lateral torque is eliminated to obtain a high-precision force value. The overall structure is simple and the cost is low.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a load sensor tensile calibration fixture, comprising a testing frame and a torque loading member mounted on the testing frame for applying dynamic or static axial loads, characterized in that: one end of the torque loading member is connected to a calibration sensor, a coaxially arranged planar bearing is linked below the calibration sensor, the lower part of the planar bearing is linked to the testing frame, and the testing frame is provided with an installation area distributed below the planar bearing for mounting the load sensor.

[0007] The above technical solution applies dynamic or static axial tensile loads via a torque loading component (preferably a jack), whose output is connected to a calibration sensor (as a reference sensor) to measure the applied force (F1) in real time. The tensile load of the calibration sensor (measuring instrument) is transmitted to the testing frame via a plane bearing. The plane bearing is coaxially arranged, and its internal ball or roller structure allows for slight rotation, converting the lateral force (Fx / Fy) or torque (Mx / My) generated by installation errors, external vibrations, or dynamic load inertia into rotational kinetic energy dissipation, ensuring that the tensile load is strictly transmitted axially to the testing frame. The load sensor is fixed in the mounting area of ​​the testing frame, receiving the pure axial force (Fz) transmitted by the plane bearing. By comparing the data of the calibration sensor and the load sensor, if their readings are consistent, the load sensor is considered qualified. This solution avoids lateral force interference affecting the calibration of the load sensor by "setting a plane bearing below the calibration sensor," meeting the requirements of high-precision industrial testing. By replacing the complex calibration fixtures in existing technologies with dual-sensor symmetrical feedback, the overall structure is simple, easy to clamp, and the equipment cost is reduced.

[0008] The aforementioned load sensor tensile calibration fixture can be further configured as follows: the testing frame includes a frame body and a lower U-shaped plate arranged below the frame body. A lower testing plate is fixedly connected to the open end of the lower U-shaped plate. The upper middle part of the lower U-shaped plate is connected to the lower part of the planar bearing. The lower U-shaped plate and the lower testing plate together form an installation area for mounting the load sensor.

[0009] Using the above technical solution, the torque loading component applies an axial tensile load to the calibration sensor, and its output tensile load is transmitted to the middle of the lower U-shaped plate through a plane bearing. The balls or rollers inside the plane bearing allow for slight rotation, converting the lateral force (Fx / Fy) or torque (Mx / My) into rotational kinetic energy dissipation, ensuring that the force is strictly transmitted axially. The mounting area formed by the lower U-shaped plate and the lower detection plate encloses the load sensor, which is fixed by bolts or clips, restricting the lateral displacement of the load sensor during the tensile process. The axial freedom constraint function of the plane bearing, combined with the rigid support of the lower U-shaped plate, ensures that the load sensor is only subjected to tensile force (Fz), avoiding non-uniform force due to clamping misalignment.

[0010] The aforementioned load sensor tensile calibration fixture can be further configured as follows: the frame body includes an upper U-shaped plate and an upper detection plate fixedly connected to the open end of the upper U-shaped plate. The upper U-shaped plate and the upper detection plate together form a working area. The middle part of the upper U-shaped plate traverses the installation area, and the middle part of the lower U-shaped plate traverses the working area. The upper U-shaped plate and the lower U-shaped plate are arranged in an alternating manner. The upper end of the torque loading member is fixedly connected to the upper detection plate, and the lower end of the torque loading member is connected to the calibration sensor. The lower part of the calibration sensor is linked with a planar bearing, and the working end face of the planar bearing away from the calibration sensor is connected to the lower U-shaped plate.

[0011] Using the above technical solution, the torque loading component applies an axial tensile force to the calibration sensor, which then provides real-time force data feedback. The tensile load of the calibration sensor is transmitted to the lower U-shaped plate via a planar bearing. The balls / rollers inside the planar bearing allow free rotation around the axis, converting lateral forces (Fx / Fy) or torques (Mx / My) generated by installation errors or dynamic load inertia into rotational kinetic energy dissipation, ensuring that the force is strictly transmitted axially to the lower U-shaped plate. The upper U-shaped plate traverses the installation area at its center, and the lower U-shaped plate traverses the working area at its center, forming a staggered spatial arrangement to create a "cross-shaped" support frame. This structure evenly distributes the calibration load to the four corners of the frame, avoiding localized stress concentration and limiting the lateral displacement of the load sensor during the tensile process.

[0012] The aforementioned load sensor tension calibration fixture can be further configured such that an adjustment gap is provided between the upper U-shaped plate and the lower U-shaped plate.

[0013] By adopting the above technical solution, a certain "adjustment gap" is reserved between the upper U-shaped plate and the lower U-shaped plate to accommodate load sensors of different sizes.

[0014] The above-mentioned load sensor tensile calibration fixture can be further configured as follows: a first threaded connecting post is provided in the middle of the upper end face of the planar bearing, a first connecting hole is provided in the middle of the calibration sensor, the first threaded connecting post is inserted into the lower part of the first connecting hole, and a second threaded connecting post is provided at the lower end of the torque loading member, the second threaded connecting post is inserted into the upper part of the first connecting hole.

[0015] By adopting the above technical solution, the plane bearing and the calibration sensor, as well as the calibration sensor and the torque loading component, are all connected by threaded connections, forming a rigid connection at each joint and improving the stability of torque transmission. At the same time, it facilitates disassembly and assembly; installation only requires tightening, thus improving clamping efficiency.

[0016] The aforementioned load sensor tensile calibration fixture can be further configured such that: a second connecting hole is provided in the middle of the lower end face of the planar bearing, and a third connecting hole corresponding to the second connecting hole is provided in the middle of the lower U-shaped plate, wherein the second connecting hole and the third connecting hole are detachably connected by a first fastener.

[0017] Using the above technical solution, the first fastener can be a standard part such as a bolt, which has good interchangeability. The plane bearing and the lower U-shaped plate are connected by a threaded connection, which forms a rigid connection at the joint and improves the stability of torque transmission. At the same time, it is convenient to disassemble and assemble; during installation, only tightening is required, thus improving clamping efficiency.

[0018] The aforementioned load sensor tensile calibration fixture can be further configured such that: the upper U-shaped plate has a fourth connecting hole in the middle, and the lower detection plate has a fifth connecting hole corresponding to the fourth connecting hole in the middle; the fourth connecting hole is detachably connected to the upper part of the load sensor through a second fastener, and the fifth connecting hole is detachably connected to the lower part of the load sensor through a third fastener.

[0019] Using the above technical solution, both the second and third fasteners can be standard parts such as bolts, ensuring good interchangeability. The two ends of the load sensor are rigidly connected to the upper and lower detection plates via threaded connections, improving torque transmission stability. Simultaneously, it facilitates assembly and disassembly; installation only requires tightening, increasing clamping efficiency.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the working state of an embodiment of the present utility model;

[0022] Figure 2 This is an exploded view of an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the state without a load sensor installed in an embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of a planar bearing according to an embodiment of the present invention.

[0025] Label annotations: Torque loading component 1, second threaded connecting post 1a; Calibration sensor 2, first connecting hole 2a; Planar bearing 3, first threaded connecting post 3a, second connecting hole 3b; Load sensor 4; Lower U-shaped plate 5, third connecting hole 5a; Lower detection plate 6, fifth connecting hole 6a; Upper U-shaped plate 7, fourth connecting hole 7a; Upper detection plate 8, adjusting gap 9. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1 to 4 The load sensor 4 tensile calibration fixture shown includes a testing frame, a torque loading member 1 mounted on the testing frame for applying dynamic or static axial loads, a calibration sensor 2 connected to one end of the torque loading member 1, and a coaxially arranged planar bearing 3 linked below the calibration sensor 2. The planar bearing 3 is linked to the testing frame below, and the testing frame has a mounting area distributed below the planar bearing 3 for mounting the load sensor 4. The planar bearing 3 is coaxially arranged, and its internal ball or roller structure allows for slight rotation, converting the lateral force (Fx / Fy) or torque (Mx / My) generated by installation errors, external vibrations, or dynamic load inertia into rotational kinetic energy dissipation, ensuring that the tensile load is strictly transmitted axially to the testing frame.

[0028] The testing frame includes a frame body and a lower U-shaped plate 5 arranged below the frame body. A lower testing plate 6 is fixedly connected to the open end of the lower U-shaped plate 5. The upper middle part of the lower U-shaped plate 5 is connected to the lower part of the plane bearing 3. The lower U-shaped plate 5 and the lower testing plate 6 together form a mounting area for mounting the load sensor 4. The torque loading element 1 applies an axial tensile load to the calibration sensor 2, and its output tensile load is transmitted to the middle part of the lower U-shaped plate 5 through the plane bearing 3. The balls or rollers inside the plane bearing 3 allow slight rotation, converting the lateral force (Fx / Fy) or torque (Mx / My) into rotational kinetic energy dissipation, ensuring that the force value is strictly transmitted axially. The mounting area formed by the lower U-shaped plate 5 and the lower testing plate 6 encloses the load sensor 4, and the load sensor 4 is fixed by bolts or clips, restricting the lateral displacement of the load sensor 4 during the tensile process. The axial degree of freedom constraint function of the plane bearing 3, combined with the rigid support of the lower U-shaped plate 5, ensures that the load sensor 4 is only subjected to tensile force (Fz), avoiding non-uniform force due to clamping misalignment.

[0029] The frame body includes an upper U-shaped plate 7 and an upper detection plate 8 fixedly connected to the open end of the upper U-shaped plate 7. The upper U-shaped plate 7 and the upper detection plate 8 together form the working area. The middle part of the upper U-shaped plate 7 crosses the installation area, and the middle part of the lower U-shaped plate 5 crosses the working area. The upper U-shaped plate 7 and the lower U-shaped plate 5 are staggered. The upper end of the torque loading member 1 is fixedly connected to the upper detection plate 8, and the lower end of the torque loading member 1 is connected to the calibration sensor 2. The lower part of the calibration sensor 2 is linked to the plane bearing 3. The working end face of the plane bearing 3 away from the calibration sensor 2 is connected to the lower U-shaped plate 5. The torque loading member 1 applies an axial tensile force to the calibration sensor 2, and the calibration sensor 2 provides real-time feedback of the force value data. The tensile load of the calibration sensor 2 is transmitted to the lower U-shaped plate 5 through the plane bearing 3. The internal balls / rollers of the planar bearing 3 are allowed to rotate freely around the axis, converting the lateral force (Fx / Fy) or torque (Mx / My) generated by installation errors or dynamic load inertia into rotational kinetic energy dissipation, ensuring that the force is strictly transmitted axially to the lower U-shaped plate 5. The upper U-shaped plate 7 traverses the installation area in the middle, and the lower U-shaped plate 5 traverses the working area in the middle, forming a spatially staggered "cross" support frame. This structure evenly distributes the calibration load to the four corners of the frame, avoiding local stress concentration, while also limiting the lateral displacement of the load sensor 4 during the tensile process.

[0030] An adjustment gap 9 is provided between the upper U-shaped plate 7 and the lower U-shaped plate 5. A certain "adjustment gap 9" is reserved between the upper U-shaped plate 7 and the lower U-shaped plate 5 to accommodate load sensors 4 of different sizes.

[0031] A first threaded connecting post 3a is provided at the center of the upper end face of the planar bearing 3, and a first connecting hole 2a is provided at the center of the calibration sensor 2. The first threaded connecting post 3a is inserted into the lower part of the first connecting hole 2a. A second threaded connecting post 1a is provided at the lower end of the torque loading component 1, and the second threaded connecting post 1a is inserted into the upper part of the first connecting hole 2a. The planar bearing 3 and the calibration sensor 2, as well as the calibration sensor 2 and the torque loading component 1, are all connected by threads, forming a rigid connection at each connection point and improving the stability of torque transmission. At the same time, it is convenient to disassemble and assemble; only tightening is required during installation, improving clamping efficiency.

[0032] The lower end face of the planar bearing 3 has a second connecting hole 3b in the middle, and the lower U-shaped plate 5 has a third connecting hole 5a corresponding to the second connecting hole 3b in the middle. The second connecting hole 3b and the third connecting hole 5a are detachably connected by a first fastener. The first fastener can be a standard part such as a bolt, which has good interchangeability. The planar bearing 3 and the lower U-shaped plate 5 are connected by a threaded connection, which forms a rigid connection at the connection point and improves the stability of torque transmission. At the same time, it is convenient to disassemble and assemble; only tightening is required during installation, thus improving clamping efficiency.

[0033] The upper U-shaped plate 7 has a fourth connecting hole 7a in its middle, and the lower detection plate 6 has a fifth connecting hole 6a corresponding to the fourth connecting hole 7a in its middle. The fourth connecting hole 7a is detachably connected to the upper part of the load sensor 4 via a second fastener, and the fifth connecting hole 6a is detachably connected to the lower part of the load sensor 4 via a third fastener. Both the second and third fasteners can be standard parts such as bolts, ensuring good interchangeability. The two ends of the load sensor 4 are rigidly connected to the upper detection plate 8 and the lower detection plate 6 respectively via threaded connections, improving torque transmission stability. This also facilitates assembly and disassembly; installation only requires tightening, improving clamping efficiency.

[0034] The working principle of this embodiment is as follows: The torque loading component 1 applies an axial tensile load to the calibration sensor 2, and the output tensile load is transmitted to the middle of the lower U-shaped plate 5 through the plane bearing 3. The balls or rollers inside the plane bearing 3 allow for slight rotation, converting the lateral force (Fx / Fy) or torque (Mx / My) into rotational kinetic energy dissipation, ensuring that the force value is strictly transmitted along the axial direction. At the same time, the upper end of the torque loading component 1 is connected to the upper U-shaped plate 7, so the upper U-shaped plate 7 exerts a tensile load on the upper end of the load sensor 4. Therefore, the upper and lower ends of the load sensor 4 receive tensile loads from the upper U-shaped plate 7 and the lower U-shaped plate 5, respectively. Then, the values ​​of the load sensor 4 and the calibration sensor 2 are read. If the two are consistent, it means that the load sensor 4 is qualified. This embodiment avoids the interference of lateral force affecting the calibration of the load sensor 4 by "setting the plane bearing 3 below the calibration sensor 2", thus meeting the high-precision industrial testing requirements. By replacing the complex calibration fixtures in the prior art with dual-sensor symmetrical feedback, the overall structure is simple and easy to clamp, reducing equipment costs.

Claims

1. A load sensor tensile calibration fixture, comprising a testing frame and a torque loading member mounted on the testing frame for applying dynamic or static axial loads, characterized in that: One end of the torque loading piece is connected with a calibration sensor, the lower side of the calibration sensor is connected with a coaxial plane bearing, the lower side of the plane bearing is connected with a detection frame, and the detection frame is provided with a mounting area distributed below the plane bearing and used for mounting a load sensor.

2. The load cell tensile calibration fixture of claim 1, wherein: The detection frame comprises a frame body, a lower U-shaped plate arranged below the frame body, and a lower detection plate fixedly connected to the open end of the lower U-shaped plate, and the upper side of the middle part of the lower U-shaped plate is connected with the lower side of the plane bearing, and the lower U-shaped plate and the lower detection plate jointly form a mounting area for mounting the load sensor.

3. The load cell tensile calibration fixture of claim 2, wherein: The frame body comprises an upper U-shaped plate and an upper detection plate fixedly connected to the open end of the upper U-shaped plate, and the upper U-shaped plate and the upper detection plate jointly form a working area, the middle part of the upper U-shaped plate crosses the mounting area, the middle part of the lower U-shaped plate crosses the working area, and the upper U-shaped plate and the lower U-shaped plate are arranged in a staggered manner, the upper end of the torque loading piece is fixedly connected with the upper detection plate, the lower end of the torque loading piece is connected with the calibration sensor, the lower side of the calibration sensor is connected with the plane bearing, and the working end face of the plane bearing away from the calibration sensor is connected with the lower U-shaped plate.

4. The load cell tensile calibration fixture of claim 3, wherein: An adjusting gap is arranged between the upper U-shaped plate and the lower U-shaped plate.

5. The load cell tensile calibration fixture of any one of claims 1 to 4, wherein: A first threaded connecting column is arranged in the middle part of the upper end face of the plane bearing, a first connecting hole is arranged in the middle part of the calibration sensor, the first threaded connecting column is inserted into the lower side of the first connecting hole, a second threaded connecting column is arranged in the lower end of the torque loading piece, and the second threaded connecting column is inserted into the upper side of the first connecting hole.

6. The load cell tensile calibration fixture of claim 3, wherein: A second connecting hole is arranged in the middle part of the lower end face of the plane bearing, a third connecting hole corresponding to the second connecting hole is arranged in the middle part of the lower U-shaped plate, and the second connecting hole and the third connecting hole are detachably connected through a first fastener.

7. The load cell tensile calibration fixture of claim 3, wherein: A fourth connecting hole is arranged in the middle part of the upper U-shaped plate, a fifth connecting hole corresponding to the fourth connecting hole is arranged in the middle part of the lower detection plate, the fourth connecting hole is detachably connected with the upper side of the load sensor through a second fastener, and the fifth connecting hole is detachably connected with the lower side of the load sensor through a third fastener.

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