A shaft pin type force sensor testing device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG HAOXIN MACHINERY CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-19
Smart Images
Figure CN224382701U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of sensor testing technology, specifically relating to a pin-type force sensor testing device. Background Technology
[0002] Force sensors are widely used in lifting equipment, the automotive industry, amusement facilities, bridge structural health monitoring, intelligent cable release hooks, tractor hoists, and other fields. To ensure product quality, the performance parameters of pin-type force sensors are typically tested. A pin-type force sensor is a device for measuring pin-type forces, used to replace pins to achieve functions such as weighing and overload monitoring. Essentially, a pin-type force sensor is a hollow cross-section circular shaft with a resistance strain gauge attached. The strain gauge acquires the micro-strain during the shaft's operation, which is then converted into stress to achieve functions such as pin-type force acquisition or overload monitoring.
[0003] Existing methods for testing pin-type force sensors involve applying a known static force to the sensor using standard weights or a pressure testing machine. The applied force is then compared with the sensor's measured value to evaluate the sensor's accuracy and stability. However, using weights requires manual addition and subtraction of weights and data recording, which is labor-intensive; while using a pressure testing machine is costly. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a pin-type force sensor testing device that can accurately measure the performance parameters of the pin-type force sensor, adapt to different working environments, and is low in cost and easy to use, in order to address the shortcomings of the existing technology.
[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:
[0006] A pin-type force sensor testing device includes: a loading mechanism, a tensile testing device, a fixing device, and a workbench. The loading mechanism includes a liftable hook, the upper end of which is connected to the upper end of the tensile testing device. The fixing device is installed on the workbench, and the force sensor to be tested is fixed to the fixing device. The detection end of the tensile testing device is connected to the pin of the force sensor.
[0007] Furthermore, it also includes a loading connector, the upper end of which is connected to the detection end of the tensile testing device, and the lower end of which is fitted onto the outside of the shaft pin of the force sensor.
[0008] Furthermore, the loading mechanism is a single-arm crane or an overhead crane.
[0009] Furthermore, the tensile testing device is an electronic crane scale.
[0010] Furthermore, the workbench is a cast iron platform, and the cast iron platform has several T-slots, with the T-slots opening at the edge of the cast iron platform.
[0011] Furthermore, the fixing device includes a base located at the lower end, the base being a long strip structure, and the base being slidably installed in a T-slot below the liftable hook.
[0012] Furthermore, the fixing device also includes a fixing bracket and a fixing block. The fixing bracket has a U-shaped structure, and the two side arms of the fixing bracket are respectively provided with mounting holes for the force sensor to pass through. After the force sensor passes through the mounting holes, it is fixed to the fixing bracket by the fixing block.
[0013] Furthermore, the fixing block has a slot and two through holes. The slot is square and matches the groove on the force sensor. The two through holes are located on both sides of the slot.
[0014] Furthermore, a plurality of fixing holes are provided around the mounting hole on one of the support arms. The plurality of fixing holes are evenly distributed on the same circumference centered on the mounting hole. The distance between two fixing holes on the fixing bracket that are symmetrical about the mounting hole is equal to the distance between two through holes on the fixing block. Fasteners pass through the through holes and the fixing holes opposite to them.
[0015] Furthermore, a power supply and a data acquisition device are provided on the workbench. The power supply is electrically connected to the loading mechanism, the tensile testing device, the force sensor, and the data acquisition device. The data acquisition device is connected to the tensile testing device and the force sensor for data communication.
[0016] After adopting the above technical solution, the beneficial effects of this utility model are:
[0017] The pin-type force sensor testing device disclosed in this utility model can accurately measure the performance parameters of the pin-type force sensor, adapt to different working environments, and is low in cost and easy to use.
[0018] In this invention, a loading connector is set between the pin-type force sensor to be tested and the tensile testing device, which can simulate the actual use environment and improve the accuracy of the measurement.
[0019] In this invention, by simultaneously rotating the fixing block and the force sensor by a certain angle and switching to the next adjacent fixing hole, the force sensor can be rotated around the axis at a set angle. This eliminates the need for measurement and meets the testing requirements. It facilitates radial force testing of the force sensor at multiple different angles, thereby comprehensively evaluating the performance of the force sensor under radial force.
[0020] In this invention, the force sensor's force and feedback output values are collected by a data acquisition device, which facilitates transmission to a computer for recording and analysis, avoiding errors caused by manual recording and reducing workload. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the testing device used in this utility model;
[0022] Figure 2 This is an assembly diagram of the workbench and the fixing device;
[0023] Figure 3 This is a structural schematic diagram of the fixing device;
[0024] Figure 4 This is a schematic diagram of the force sensor structure;
[0025] Figure 5 yes Figure 4 Sectional view along line AA;
[0026] Figure 6 Schematic diagram of the fixing block;
[0027] Figure 7 This is a schematic diagram of a force sensor at different angles;
[0028] Figure 8 This is a schematic diagram of the stress analysis of the strain gauge;
[0029] Figure 9 This is a structural diagram of the fixed bracket;
[0030] In the diagram, 1-loading mechanism, 11-liftable hook, 2-tensile testing equipment, 3-loading connector, 4-fixing device, 41-fixed bracket, 411-mounting hole, 412-fixing hole, 42-fixing block, 421-slot, 422-through hole, 43-base, 5-force sensor, 51-strain gauge, 52-groove, 6-worktable, 61-T-slot, 7-power supply, 8-data acquisition unit. Detailed Implementation
[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the textual part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.
[0032] like Figure 1As shown, a pin-type force sensor testing device includes: a loading mechanism 1, a tensile testing device 2, a fixing device 4, and a workbench 6. The loading mechanism 1 includes a liftable hook 11, the upper end of which is connected to the upper end of the tensile testing device 2. The fixing device 4 is installed on the workbench 6, and the force sensor 5 to be tested is fixed to the fixing device 4. The detection end of the tensile testing device 2 is connected to the pin of the force sensor 5.
[0033] After the loading mechanism 1 is started, the lifting hook 11 is raised to a certain height, providing a certain load weight to the force sensor 5 to be tested. The reading of the tension detection device 2 is the tension force on the force sensor 5. The performance of the force sensor 5 can be judged based on the tension force and the feedback output value of the force sensor 5.
[0034] Furthermore, the testing device of this application also includes a loading connector 3. The upper end of the loading connector 3 is connected to the detection end of the tensile testing device 2, and the lower end of the loading connector 3 is fitted onto the outside of the pin of the force sensor 5. Since the pin-type force sensor 5 is connected to the component under test through a structure similar to the loading connector 3 in actual use, this application uses the loading connector 3 to connect the force sensor 5 under test and the tensile testing device 2.
[0035] In this application, the loading mechanism 1 can be a single-arm crane or an overhead crane, and no specific equipment is required to generate a fixed force. This application uses a single-arm crane as an example. The tensile force testing device 2 is an electronic crane scale, which has high force measurement accuracy.
[0036] like Figure 2 and Figure 3 As shown, the workbench 6 is a cast iron platform capable of withstanding significant reaction forces. Several T-slots 61 are formed on the cast iron platform, with openings at the edges. The fixing device 4 includes a base 43 at its lower end. The base 43 is a long, narrow structure that slides within the T-slots 61 below the liftable hook 11, facilitating the installation and position adjustment of the fixing device 4. Since the fixing device 4 experiences an upward pulling force during testing, the T-slots 61 on the cast iron platform cooperate with the base 43 of the fixing device 4 to secure the fixing device 4 during the test.
[0037] like Figure 3 As shown, the fixing device 4 also includes a fixing bracket 41 and a fixing block 42. The fixing bracket 41 has a U-shaped structure. The two sides of the fixing bracket 41 are respectively provided with mounting holes 411 for the force sensor 5 to pass through. After the force sensor 5 passes through the mounting holes 411, it is fixed to the fixing bracket 41 by the fixing block 42.
[0038] like Figure 4 , Figure 5 and Figure 6As shown, the fixing block 42 has a slot 421 and two through holes 422. The slot 421 is square and fits into the groove 52 on the force sensor 5. The two through holes 422 are located on both sides of the slot 421. The slot 421 of the fixing block 42 can engage with the groove 52 on the force sensor 5. When the fixing block 42 is fixed to the fixing bracket 41, the force sensor 5 cannot rotate relative to the fixing bracket 41.
[0039] like Figure 7 As shown, since the force sensor 5 detects the tensile force through the deformation of multiple strain gauges 51 inside (the number and arrangement of strain gauges 51 in the figure are only examples), the strain gauges 51 deform differently when the force sensor 5 is subjected to different force directions, and the force sensed by a single strain gauge 51 is also different. The final feedback signal value output by the force sensor 5 is the sum of the forces sensed by all strain gauges 51. Figure 7 In (a), (b), and (c), force sensors 5 at three different angles are used as examples, all of which are subjected to a vertically upward pulling force.
[0040] like Figure 8 As shown, when there is an angle between strain gauge 51 and the direction of the force, the magnitude of the sensing response force should be the component force in the direction of strain gauge 51, F1=F*COSθ (F is the applied force; F1 is the force that strain gauge 51 can feedback, i.e., the force that the sensor can measure; θ is the angle between the direction of the applied force and the deformation direction of strain gauge 51).
[0041] Therefore, in order to comprehensively evaluate the performance of the force sensor 5 under radial force conditions, it is necessary not only to conduct radial force tests in a single direction, but also to conduct radial force tests at multiple different angles on the force sensor 5. This requires that after one test, the force sensor 5 be rotated by a certain angle with its axis as the center, and then the test be conducted again. The tensile force value shown by the tensile force detection device 2 and the corresponding feedback signal value of the force sensor 5 under radial force conditions at different angles should be recorded.
[0042] To avoid the need to measure the angle every time the force sensor 5 rotates, and to ensure the accuracy of the rotation angle, the rotation of the fixed block 42 can be limited by the structure on the fixed bracket 41, so that the rotation angle of the force sensor 5 and the fixed block 42 is the same as the required angle each time.
[0043] like Figure 9As shown, preferably, a plurality of fixing holes 412 are provided around the mounting hole 411 on one of the support arms. The fixing holes 412 are evenly distributed on the same circumference centered on the mounting hole 411. The distance between two fixing holes 412 symmetrical about the mounting hole 411 on the fixing bracket 41 is equal to the distance between two through holes 422 on the fixing block 42. Fasteners pass through the through holes 422 and the corresponding fixing holes 412 to fix the force sensor 5. After the fixing block 42 and the force sensor 5 are simultaneously rotated clockwise or counterclockwise to switch to adjacent fixing holes 412 for fixation, the next radial force test can be performed.
[0044] In this application, the angle θ1 formed between the center of the adjacent fixing hole 412 and the center of the mounting hole 411 is 10°. There are a total of 36 fixing holes 412, that is, the force sensor 5 performs a radial force test every 10°.
[0045] like Figure 1 As shown, a power supply 7 and a data acquisition unit 8 are installed on the workbench 6. The power supply 7 is electrically connected to the loading mechanism 1, the tension detection device 2, the force sensor 5, and the data acquisition unit 8. The data acquisition unit 8 is connected to the tension detection device 2 and the force sensor 5 for data communication. The power supply 7 provides power to the system. The data acquisition unit 8 collects the tension value output by the tension detection device 2 and the feedback output value of the force sensor 5, and automatically transmits them to the computer. The computer records the collected data, analyzes it according to a preset program, and calibrates the sensors.
[0046] The testing procedure for the testing device in this application includes the following steps:
[0047] S1. Connect the liftable hook 11 of the single-arm crane to the electronic crane scale and the loading connector 3, and perform zeroing and calibration operations on the electronic crane scale.
[0048] S2. Conduct a no-load test. Start the single-arm crane, raise the electronic crane scale to a certain height, and then slowly lower it. During this process, use the electronic crane scale to record the tension value when the force sensor 5 is not connected.
[0049] S3. When the single-arm crane is operating normally and the electronic crane scale can accurately measure the tension, install the force sensor 5 on the fixed device 4, turn on the power supply 7 and the data acquisition device 8, and control the lifting height of the lifting hook 11 of the single-arm crane to raise the hook to a suitable height and maintain a stable state, so that the force sensor 5 bears the corresponding load, thereby performing a radial force test on the force sensor 5.
[0050] The radial force test in step S3 specifically includes the loading test in S31 and the unloading test in S32.
[0051] S31. During the loading test, the load weight of the force sensor 5 is increased proportionally by increasing the range of the force sensor 5 by 10% each time until the rated load of the force sensor 5 or the maximum load required for the test is reached. After each loading of a certain weight, the tensile force value shown by the tensile testing device 2 and the feedback signal value of the force sensor 5 are collected simultaneously.
[0052] S32. After the loading test is completed, the load weight of the force sensor 5 is reduced proportionally by reducing the range of the force sensor 5 by 10% each time until the force sensor 5 returns to the unloaded state. After unloading a certain weight each time, the tensile force value shown by the tensile force detection device 2 of the force sensor 5 and the feedback signal value of the force sensor 5 are collected simultaneously.
[0053] S4. Take the angle of force sensor 5 during the first measurement as the origin (0°). After completing steps S31 and S32 (i.e., completing one load-unload cycle):
[0054] a) Determine whether all predetermined angles (e.g., 0°, 10°, 20°, ..., 350°) have been tested.
[0055] b) If not all angle tests are completed, rotate the force sensor 5 together with the fixing block 42 clockwise or counterclockwise to the next predetermined angle (e.g., rotate 10°).
[0056] c) Return to step S31 and continue with the new angle of loading and unloading tests.
[0057] d) If all predetermined angle tests have been completed, the test ends.
[0058] S5. The data acquisition device 8 collects the tensile force value and feedback signal of the tensile testing device 2 and the force sensor 5 in each test and transmits them to the computer. The computer records and analyzes the collected data using software. The computer calculates the linearity, sensitivity, and hysteresis of the force sensor 5 based on the tensile force value of the tensile testing device 2 and the feedback signal value of the force sensor 5. When the linearity, sensitivity, and hysteresis do not exceed the corresponding set values, the force sensor 5 is qualified; otherwise, it is unqualified.
[0059] The pin-type force sensor testing device of this utility model is a testing device composed of a loading mechanism, a tensile testing device, a worktable and a fixing device set on the worktable. It can accurately measure the performance parameters of the pin-type force sensor, can work normally under harsh environmental conditions, adapt to different working environments, and the system is easy and quick to install, low in cost and easy to use.
[0060] In the description of this specification, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationships based on the directional or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0061] In the description of this specification, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Unless otherwise explicitly specified, terms such as "set," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0062] While specific embodiments of this utility model have been described above, those skilled in the art should understand that the described embodiments are merely some, not all, embodiments of this utility model. These are merely illustrative examples, and the scope of protection of this utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model and without any inventive effort, but all such changes and modifications fall within the scope of protection of this utility model.
Claims
1. A pin-type force sensor testing apparatus, characterized by, include: The system includes a loading mechanism, a tensile testing device, a fixing device, and a workbench. The loading mechanism includes a liftable hook, the upper end of which is connected to the upper end of the tensile testing device. The fixing device is installed on the workbench, and the force sensor to be measured is fixed to the fixing device. The detection end of the tensile testing device is connected to the shaft pin of the force sensor.
2. The shaft pin force sensor testing device of claim 1, wherein, It also includes a loading connector, the upper end of which is connected to the detection end of the tensile testing device, and the lower end of which is fitted onto the outside of the shaft pin of the force sensor.
3. The shaft pin force sensor testing apparatus of claim 1, wherein, The loading mechanism is a single-arm crane or an overhead crane.
4. The shaft pin force sensor testing apparatus of claim 1, wherein, The tensile testing equipment is an electronic crane scale.
5. The shaft pin force sensor testing apparatus of claim 1, wherein, The workbench is a cast iron platform, and several T-slots are provided on the cast iron platform. The T-slots are open at the edges of the cast iron platform.
6. The shaft pin force sensor testing device of claim 5, wherein, The fixing device includes a base located at the lower end. The base is a long strip structure and is slidably installed in a T-slot below the liftable hook.
7. The shaft pin force sensor testing device of claim 6, wherein, The fixing device also includes a fixing bracket and a fixing block. The fixing bracket has a U-shaped structure. The two side arms of the fixing bracket are respectively provided with mounting holes for the force sensor to pass through. After the force sensor passes through the mounting holes, it is fixed to the fixing bracket by the fixing block.
8. The shaft pin force sensor testing device of claim 7, wherein, The fixing block has a slot and two through holes. The slot is square and fits the groove on the force sensor. The two through holes are located on both sides of the slot.
9. The shaft pin force sensor testing device of claim 8, wherein, One of the support arms has multiple fixing holes around the mounting hole. The multiple fixing holes are evenly distributed on the same circumference centered on the mounting hole. The distance between two fixing holes on the fixed bracket that are symmetrical about the mounting hole is equal to the distance between two through holes on the fixed block. Fasteners pass through the through holes and the fixing holes opposite to them.
10. The pin-on-rod force sensor testing device of any one of claims 1 to 9, wherein, The workbench is equipped with a power supply and a data acquisition device. The power supply is electrically connected to the loading mechanism, the tensile testing device, the force sensor, and the data acquisition device. The data acquisition device is connected to the tensile testing device and the force sensor for data communication.