A force sensor testing device

Abstract

The application relates to the field of automobile part blanking and discloses a force sensor test, which comprises a base, four vertical columns are welded and fixed at the upper end of the base, two adjacent vertical columns are welded and fixed with a connecting top frame at the top, a sliding displacement assembly is arranged on the side of the connecting top frame facing the base, a force test assembly is arranged at the lower end of the sliding displacement assembly, and an impact test assembly is arranged at the lower end of the sliding displacement assembly and beside the force test assembly. In the application, the double-layer tablet and the self-adaptive cylinder wall structure ensure that the force flow is uniformly distributed and the eccentric load error is eliminated; in the aspect of impact mechanics simulation, the modular impact generator and the positioning system are integrally created: the sliding displacement assembly drives the force module and the impact module to synchronously and precisely translate, the first hydraulic cylinder drives the double-slide plate linkage mechanism to realize accurate adjustment, the impact ball axis is aligned with the center of the stress groove, the transverse hydraulic rod instantaneously retracts to trigger the transversely inserted rod tripping mechanism, and the impact ball releases controllable kinetic energy.

Description

Technical Field

[0001] This invention relates to the field of force sensor testing, and more particularly to a force sensor testing device. Background Technology

[0002] A force sensor is a device that converts force signals into measurable electrical signals. It can convert various non-electrical physical quantities such as force, pressure, and torque into measurable electrical signals. It is widely used in industries such as safety monitoring, weighing and measurement, medical diagnosis, home appliances, and industrial automation. It is a key technology for automatic control. Force sensors are widely used in various fields of social development and human life, such as industrial automation, agricultural modernization, aerospace technology, military engineering, robotics, resource development, marine exploration, environmental monitoring, security, medical diagnosis, transportation, and home appliances. A force sensor testing device is a device used to calibrate, verify, and evaluate the performance of force sensors.

[0003] The existing force sensor testing devices have separate static and dynamic testing functions, and the lack of a static-dynamic joint adjustment mechanism leads to distortion in the simulation of impact conditions; the transmission system has mechanical backlash and resonance risks, and traditional lead screw and gear structures are prone to error accumulation under high-frequency impact; the multi-dimensional force coupling verification capability is lacking, making it impossible to synchronously reproduce the complex multi-axial force state in industrial sites. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a force sensor testing device to solve the problems of the separation of static and dynamic testing functions in existing force sensor testing devices, the lack of static and dynamic joint adjustment mechanism leading to distortion of impact condition simulation; mechanical backlash and resonance risks in the transmission system; the tendency of traditional lead screw and gear structures to accumulate errors under high-frequency impact; and the lack of multi-dimensional force coupling verification capability, making it impossible to synchronously reproduce the complex multi-axial force state in industrial sites.

[0005] To address the aforementioned problems, the present invention is implemented through the following technical solution.

[0006] A force sensor testing device includes: a base, a test mounting assembly, a sliding displacement assembly, a force application testing assembly, and an impact testing assembly. Columns are welded and fixed to the four corners of the upper end of the base, and connecting top frames are welded and fixed to the tops of adjacent columns. The test mounting assembly is disposed on the upper end of the base for mounting the force sensor to be tested. The sliding displacement assembly is disposed on the side of the connecting top frame facing the base. The force application testing assembly and the impact testing assembly are disposed side-by-side at the lower end of the sliding displacement assembly and are driven by the sliding displacement assembly to move synchronously, allowing the indenter of the force application testing assembly or the impact ball of the impact testing assembly to selectively align with the force groove on the test mounting assembly.

[0007] The sliding displacement assembly includes: two slide rails, a first sliding plate, a second sliding plate, a connecting rod, and a first hydraulic cylinder. The two slide rails are symmetrically arranged on both sides of the connecting top frame, with a groove formed on the opposite side of each slide rail. The first and second sliding plates are arranged laterally side-by-side between the two slide rails, with their ends extending into corresponding grooves. The connecting rod connects the first and second sliding plates. The first hydraulic cylinder is fixed to the connecting top frame, and its drive end is connected to a first connecting plate via a first piston rod. The first connecting plate is detachably connected to the first sliding plate via a first fastening screw.

[0008] The force testing assembly includes a second hydraulic cylinder, a first columnar sensor, and a pressure head. The second hydraulic cylinder is fixed to a first sliding plate, and a second piston rod is connected to the drive end of the second hydraulic cylinder. The first columnar sensor is connected to the second piston rod via a first connecting plate, and the first connecting plate is fixed to the second piston rod by multiple equally spaced second fastening screws. The pressure head is connected to the first columnar sensor via a second connecting plate, and the second connecting plate is fixed to the first columnar sensor by multiple equally spaced third fastening screws.

[0009] The impact testing assembly includes: a connecting support frame, a longitudinal hydraulic rod, a first connecting block, a transverse hydraulic rod, a transverse insertion rod, and an impact ball. The bottom of the connecting support frame is welded and fixed to the upper end of the second slide plate, and the connecting support frame is L-shaped. The longitudinal hydraulic rod is located at the lower end of the top L-shaped side of the connecting support frame, and its output end is connected to a longitudinal telescopic rod. The first connecting block is located at the end of the longitudinal telescopic rod away from the longitudinal hydraulic rod. The transverse hydraulic rod is located on the side of the first connecting block facing the second slide plate, and its drive end is connected to a transverse telescopic rod. The transverse insertion rod is located at the end of the transverse telescopic rod away from the transverse hydraulic rod. The impact ball is suspended below the transverse insertion rod via a first connecting ring.

[0010] The impact testing assembly also includes a connecting rope, a second connecting ring, and a second connecting block. The two ends of the connecting rope are respectively connected to the first connecting ring and the second connecting ring. The second connecting ring is detachably connected to the second slide plate through the second connecting block and the fourth fastening screw.

[0011] The test installation components include: a connecting base plate, a second column-type sensor, a lower fixing cylinder, a first pressure plate, a second pressure plate, and a pressing cylinder cover. The connecting base plate is fixed to the base with a fifth fastening screw. The second column-type sensor is located at the upper end of the connecting base plate. The lower fixing cylinder is connected to the second column-type sensor via a second connecting plate, and is fixed to the second connecting plate with a series of equally spaced sixth fastening screws. The first pressure plate is located at the bottom inner side of the lower fixing cylinder, and the second pressure plate is located above the force sensor. The pressing cylinder cover is fitted over the second pressure plate, and a force-receiving groove is formed on the top of the pressing cylinder cover, in which the force sensor is clamped between the first and second pressure plates.

[0012] The first column sensor is configured to monitor the input force applied by the force testing component in real time.

[0013] The second column sensor is configured to provide feedback on the base reaction force borne by the test mounting assembly.

[0014] The impact ball is a replaceable component; different weight impact balls can be replaced by removing the fourth fastening screw.

[0015] The device applies an increasing static load to the force sensor through the force testing component and a dynamic impact load to the force sensor through the impact testing component. The force sensor testing device constructs a triangular verification model based on the readings of the first column sensor, the second column sensor, and the force sensor.

[0016] This invention provides a force sensor testing device. Compared with the prior art, it has the following advantages:

[0017] Through a static-dynamic joint debugging and multi-parameter mutual calibration technology system, full-condition coverage and accuracy improvement from static calibration to dynamic impact were achieved. A three-level progressive loading and triple sensor closed-loop verification system was constructed: In static testing, the second hydraulic cylinder drives the pressure head to apply three incremental loads to the force sensor under test, while the first column sensor monitors the input force value in real time and the second column sensor feeds back the base reaction force, forming an "input-output-base" triangular verification model; the double-layer pressure plate and adaptive cylinder wall structure ensure uniform force flow distribution and eliminate off-center loading errors; in terms of impact mechanics simulation, a modular impact generator and positioning system were innovatively integrated: sliding... The dynamic displacement component drives the force application module and impact module to move synchronously and precisely. The first hydraulic cylinder drives the double slide linkage mechanism to achieve precise adjustment, ensuring that the axis of the impact ball is aligned with the center of the force groove. The instantaneous retraction of the transverse hydraulic rod triggers the horizontal insertion rod release mechanism, releasing the impact ball to generate controllable kinetic energy. Combined with the optional tungsten alloy impact ball, a multi-level impact spectrum is generated. The quick-release structure of the second connecting ring supports the replacement of different mass punches. The impact response database is established through three repeated experiments. Compared with traditional equipment, this device has revolutionary advantages, with full-cycle error correction: dynamic capture of impact phase transition characteristics that cannot be identified by static calibration, effectively improving the confidence of the force value. Attached Figure Description

[0018] Figure 1 A side-view three-dimensional structural diagram of the force sensor testing device;

[0019] Figure 2 A top-view three-dimensional structural diagram of the force sensor testing device;

[0020] Figure 3 A front-view three-dimensional structural diagram of the force sensor testing device;

[0021] Figure 4A schematic diagram of the force testing component of the force sensor testing device;

[0022] Figure 5 A schematic diagram of the impact testing component of a force sensor testing device;

[0023] Figure 6 Force sensor testing device Figure 5 Enlarged structural diagram at point A in the middle;

[0024] Figure 7 Force sensor testing device Figure 5 Enlarged structural diagram at point B;

[0025] Figure 8 A schematic diagram of the test installation components for a force sensor testing device;

[0026] Figure 9 This is a schematic diagram of a partial explosion of the test installation components for a force sensor testing device.

[0027] The attached figures are labeled as follows:

[0028] 1. Base; 2. Column; 3. Connecting top frame; 4. Sliding displacement assembly; 401. Slide rail frame; 402. Slide groove; 403. First slide plate; 404. Connecting rod; 405. Second slide plate; 406. First connecting plate; 407. First fastening screw; 408. First piston rod; 409. First hydraulic cylinder; 5. Force testing assembly; 501. Second hydraulic cylinder; 502. Second piston rod; 503. First connecting pad; 504. Second fastening screw; 505. First column sensor; 506. Second connecting pad; 507. Third fastening screw; 508. Indenter; 6. Impact testing assembly; 601. Connecting support frame; 602. Longitudinal... 603. Longitudinal telescopic rod; 604. First connecting block; 605. Lateral hydraulic rod; 606. Lateral telescopic rod; 607. Horizontal insertion rod; 608. First connecting ring; 609. Impact ball; 610. Connecting rope; 611. Second connecting ring; 612. Second connecting block; 613. Fourth fastening screw; 7. Test installation assembly; 701. Connecting base plate; 702. Fifth fastening screw; 703. Second column sensor; 704. Second connecting plate; 705. Lower fixed cylinder; 706. Sixth fastening screw; 707. First pressure plate; 708. Force sensor; 709. Second pressure plate; 710. Pressing cylinder cover; 711. Force groove. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0031] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0032] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0033] Reference Figures 1-9 This application provides a force sensor testing device, including: a base 1, a test mounting assembly 7, a sliding displacement assembly 4, a force application testing assembly 5, and an impact testing assembly 6. Columns 2 are welded and fixed to the four corners of the upper end of the base 1, and connecting top frames 3 are welded and fixed to the tops of adjacent columns 2. The test mounting assembly 7 is disposed on the upper end of the base 1 and is used to mount the force sensor 708 to be tested. The sliding displacement assembly 4 is disposed on the side of the connecting top frame 3 facing the base 1. The force application testing assembly 5 and the impact testing assembly 6 are arranged side-by-side at the lower end of the sliding displacement assembly 4 and are driven by the sliding displacement assembly 4 to move synchronously, so that the indenter 508 of the force application testing assembly 5 or the impact ball 609 of the impact testing assembly 6 can selectively align with the force groove 711 on the test mounting assembly 7.

[0034] The four corners of the upper end of the base 1 are welded with fixed columns 2, and the tops of two adjacent columns 2 are welded with fixed connecting frames 3 to form a stable support structure. The test mounting assembly 7 is set on the upper end of the base 1, and the force sensor 708 to be tested is installed on the test mounting assembly 7 to complete the sensor positioning before testing. The sliding displacement assembly 4 is activated, driving the force application test assembly 5 arranged side by side at the lower end to translate. Through the precise drive of the sliding displacement assembly 4, the pressure head 508 of the force application test assembly 5 is aligned with the force groove 711 on the test mounting assembly 7. Then the force application test assembly 5 is activated, applying a load to the force groove 711 through the pressure head 508, which is then transmitted to the force sensor 708 to be tested, realizing the static load test of the force sensor 708. After the static test is completed, the sliding displacement component 4 continues to move, driving the impact test component 6 to move synchronously, while the force application test component 5 moves away with the sliding displacement component 4; until the impact ball 609 of the impact test component 6 is aligned with the force groove 711 of the test mounting component 7, the impact test component 6 releases the impact ball 609, the impact ball 609 hits the force groove 711, and transmits the impact load to the force sensor 708, completing the dynamic impact test on the force sensor 708.

[0035] This application embodiment employs a combination of force testing component 5 and impact testing component 6: force testing component 5 provides a stable static load through indenter 508, adapting to the performance verification of force sensor 708 under static conditions; impact testing component 6 provides a dynamic impact load through impact ball 609, adapting to the performance verification under dynamic conditions. The two load types cover common force scenarios in industrial sites, achieving comprehensive verification of the performance of force sensor 708 in multiple scenarios.

[0036] In this embodiment, the force testing component 5 (static test) and the impact testing component 6 (dynamic test) are arranged side by side at the lower end of the sliding displacement component 4. Through the synchronous translation function of the sliding displacement component 4, static load test and dynamic impact test can be continuously completed on the same test mounting component 7 and the same force sensor 708 without disassembling the force sensor 708 or replacing the test platform, thus realizing the integration of static and dynamic testing and avoiding the distortion of working condition simulation caused by the separation of tests.

[0037] The welded and fixed structure of the base 1, column 2, and connecting top frame 3 forms a rigid support frame, which effectively avoids external interference caused by frame shaking during the test. At the same time, the sliding displacement component 4 can precisely drive the pressure head 508 of the force application test component 5 and the impact ball 609 of the impact test component 6 to align with the force groove 711, ensuring that the load always acts on the same reference point (force groove 711) and reducing test deviations caused by component misalignment.

[0038] In some embodiments, the sliding displacement assembly 4 includes: two slide rails 401, a first sliding plate 403, a second sliding plate 405, a connecting rod 404, and a first hydraulic cylinder 409. The two slide rails 401 are symmetrically arranged on both sides of the connecting top frame 3, and each slide rail 401 has a groove 402 on its opposite side. The first sliding plate 403 and the second sliding plate 405 are arranged laterally side-by-side between the two slide rails 401, with both ends of the first sliding plate 403 and the second sliding plate 405 extending into their respective grooves 402. The connecting rod 404 connects the first sliding plate 403 and the second sliding plate 405. The first hydraulic cylinder 409 is fixed to the connecting top frame 3, and the drive end of the first hydraulic cylinder 409 is connected to a first connecting plate 406 via a first piston rod 408. The first connecting plate 406 is detachably connected to the first sliding plate 403 via a first fastening screw 407.

[0039] The first hydraulic cylinder 409, as the core power component of the sliding displacement assembly 4, is fixed to the connecting top frame 3. The connecting top frame 3 is welded to the base 1 through the column 2 to form a rigid frame. Therefore, the installation position of the first hydraulic cylinder 409 is stable, providing a stable driving force. When it is necessary to adjust the position of the force application test assembly 5 or the impact test assembly 6, the first hydraulic cylinder 409 is energized and activated. The hydraulic oil inside pushes the piston to move, which in turn drives the first piston rod 408 connected to the drive end to perform linear extension and retraction. The end of the first piston rod 408 is directly connected to the first connecting plate 406. The first connecting plate 406 is detachably but rigidly fixed to the first sliding plate 403 through the first fastening screw 407. Therefore, the extension and retraction force of the first piston rod 408 is directly transmitted to the first connecting plate 406, and then to the first sliding plate 403 through the first connecting plate 406. When the first piston rod 408 extends, it pushes the first slide plate 403 to move closer to the test mounting assembly 7; when the first piston rod 408 retracts, it pulls the first slide plate 403 to move away from the test mounting assembly 7, thus completing the power transmission from the hydraulic cylinder to the slide plate.

[0040] When the first slide plate 403 moves laterally under the driving force of the first piston rod 408, it generates a synchronous pulling or pushing force on the second slide plate 405 through the connecting rod 404. Since the connecting rod 404 is a rigid structure with no elastic deformation, the second slide plate 405 will maintain the same direction of movement, speed of movement, and distance of movement as the first slide plate 403, thereby achieving synchronous translation of the two slide plates. The force testing component 5 is fixed to the lower end of the first slide plate 403, and the impact testing component 6 is fixed to the lower end of the second slide plate 405. Therefore, the two testing components will move synchronously with the slide plates, avoiding positioning deviations caused by asynchronous movement.

[0041] Two slide rail frames 401 are symmetrically arranged on both sides of the connecting top frame 3, forming a parallel and fixed transverse track reference, which limits the movement direction of the slide plate to the length direction of the slide rail frame 401. Each slide rail frame 401 has a groove 402 on the opposite side, and the two ends of the first slide plate 403 and the second slide plate 405 extend into the corresponding groove 402 respectively. The groove opening size of the groove 402 is precisely matched with the end size of the slide plate, which allows the slide plate to slide smoothly along the groove, while restricting the displacement of the slide plate in the vertical and horizontal directions, preventing the slide plate from leaving the track or becoming skewed, and ensuring that the two slide plates always move in a straight line in the transverse direction. Ultimately, this ensures that the pressure head 508 of the force application test component 5 and the impact ball 609 of the impact test component 6 can be accurately aligned with the force groove 711.

[0042] In some embodiments, the force testing assembly 5 includes a second hydraulic cylinder 501, a first columnar sensor 505, and a pressure head 508. The second hydraulic cylinder 501 is fixed to a first sliding plate 403, and a second piston rod 502 is connected to the drive end of the second hydraulic cylinder 501. The first columnar sensor 505 is connected to the second piston rod 502 via a first connecting pad 503, and the first connecting pad 503 is fixed to the second piston rod 502 via a plurality of equally spaced second fastening screws 504. The pressure head 508 is connected to the first columnar sensor 505 via a second connecting pad 506, and the second connecting pad 506 is fixed to the first columnar sensor 505 via a plurality of equally spaced third fastening screws 507.

[0043] The second hydraulic cylinder 501, as the core power component of the force application testing assembly 5, is fixed on the first sliding plate 403. Combined with the function of the aforementioned sliding displacement assembly 4, the first sliding plate 403 can drive the entire force application testing assembly 5 to move horizontally, ensuring that the pressure head 508 is aligned with the force-receiving groove 711. During the force application phase, the second hydraulic cylinder 501 drives the piston to perform linear extension and retraction motion through changes in the internal hydraulic oil pressure. This, in turn, drives the second piston rod 502 connected to its drive end to move vertically, i.e., towards or away from the test mounting assembly 7, converting hydraulic energy into mechanical energy to provide stable power for applying static loads. For example, when the load needs to be increased, the oil pressure inside the second hydraulic cylinder 501 increases, pushing the piston downwards, and the second piston rod 502 extends synchronously, transmitting thrust downwards. When the load needs to be reduced or reset, the pressure inside the hydraulic cylinder decreases, the piston resets upwards, and the second piston rod 502 retracts, driving subsequent components to move upwards.

[0044] To avoid test errors caused by uneven force transmission during the application of force, such as local stress concentration or skewed force on the sensor under test, the component achieves uniform force transmission through the first connecting pad 503, the second connecting pad 506, and the fastening screws arranged at equal intervals in the ring, specifically through two transmission paths.

[0045] The first transmission path extends from the second piston rod 502 to the first column sensor 505: the end of the second piston rod 502 is connected to the first column sensor 505 via a first connecting pad 503, and the first connecting pad 503 is fixed to the second piston rod 502 by multiple equally spaced second fastening screws 504. The first connecting pad 503 is a rigid plate, which increases the contact area between the second piston rod 502 and the first column sensor 505, avoiding local stress concentration caused by point contact at the end of the piston rod, and evenly distributing the thrust of the piston rod to the upper surface of the first column sensor 505. The multiple second fastening screws 504 are evenly distributed along the outer ring of the first connecting pad 503, ensuring that the fixing force between the connecting pad and the second piston rod 502 is evenly distributed, preventing the pad from tilting due to uneven fixing, and thus ensuring that the force transmitted by the piston rod acts vertically on the first column sensor 505.

[0046] The second transmission path extends from the first column sensor 505 to the pressure head 508. The second connecting pad 503 increases the contact area between the first column sensor 505 and the pressure head 508. The equidistant third fastening screws 507 ensure that the pad is fixed to the sensor and the pressure head without tilting. Finally, the force transmitted by the first column sensor 505 is evenly guided to the lower end face of the pressure head 508, avoiding bias pressure when the pressure head 508 contacts the force groove 711.

[0047] For example, the first column sensor 505 is configured to monitor the input force applied by the force testing component 5 in real time. When the force transmitted by the second piston rod 502 passes through the first column sensor 505, the strain gauge inside the first column sensor 505 will deform due to the force, thereby converting the mechanical force signal into a readable electrical signal, such as voltage or current changes. By receiving this electrical signal through an external data acquisition device, the current input force value applied by the force testing component 5 can be obtained in real time. This data serves as the basis for controlling the second hydraulic cylinder 501 to adjust the load (e.g., increasing the load by a set value), and is also a key reference data for subsequent triangulation verification with the output value of the force sensor 708 and the reaction force value of the second column sensor 703.

[0048] The pressure head 508 is the direct contact component between the force application test assembly 5 and the test mounting assembly 7. The lower end face of the pressure head 508 is designed to fit the force groove 711 of the test mounting assembly 7, such as matching shape and corresponding size. When the second piston rod 502 drives the pressure head 508 to move downward, the lower end face of the pressure head 508 will be precisely embedded in the force groove 711, and the static load will be uniformly transmitted to the force sensor 708 under test through the force groove 711, the pressing cylinder cover 710, and the second pressure plate 709, ultimately achieving controllable, uniform, and monitorable static load application.

[0049] In some embodiments, the impact testing assembly 6 includes: a connecting support frame 601, a longitudinal hydraulic rod 602, a first connecting block 604, a transverse hydraulic rod 605, a transverse insertion rod 607, and an impact ball 609. The bottom of the connecting support frame 601 is welded and fixed to the upper end of the second sliding plate 405, and the connecting support frame 601 is L-shaped. The longitudinal hydraulic rod 602 is disposed at the lower end of the top L-shaped side of the connecting support frame 601, and its output end is connected to a longitudinal telescopic rod 603. The first connecting block 604 is disposed at the end of the longitudinal telescopic rod 603 away from the longitudinal hydraulic rod 602. The transverse hydraulic rod 605 is disposed on the side of the first connecting block 604 facing the second sliding plate 405, and its driving end is connected to a transverse telescopic rod 606. The transverse insertion rod 607 is disposed at the end of the transverse telescopic rod 606 away from the transverse hydraulic rod 605. The impact ball 609 is suspended below the transverse insertion rod 607 via a first connecting ring 608.

[0050] The impact test assembly 6 also includes a connecting rope 610, a second connecting ring 611, and a second connecting block 612. The two ends of the connecting rope 610 are respectively connected to the first connecting ring 608 and the second connecting ring 611. The second connecting ring 611 is detachably connected to the second slide plate 405 through the second connecting block 612 and the fourth fastening screw 613.

[0051] The connecting support frame 601 is L-shaped, and its bottom is welded and fixed to the upper end of the second sliding plate 405. This welding structure ensures that the support frame 601 is firm and does not loosen, providing stable support for subsequent longitudinal and transverse components. The longitudinal hydraulic rod 602 is fixed to the lower end of the L-shaped side of the connecting support frame 601, and its output end is connected to the longitudinal telescopic rod 603. The end of the longitudinal telescopic rod 603 away from the hydraulic rod is fixed to the first connecting block 604. The first connecting block 604 also carries the transverse hydraulic rod 605, forming a power transmission chain of longitudinal hydraulic rod, telescopic rod, connecting block, and transverse components. When it is necessary to increase the impact kinetic energy, the longitudinal hydraulic rod 602 drives the longitudinal telescopic rod 603 to extend upward, causing the first connecting block 604, transverse hydraulic rod 605, and transverse insertion rod 607 to rise synchronously. The transverse insertion rod 607 suspends the first connecting ring 608 and the impact ball 609, so the suspension height of the impact ball 609 increases accordingly. Conversely, when the longitudinal telescopic rod 603 retracts, the height of the impact ball 609 decreases.

[0052] A transverse hydraulic rod 605 is fixed to the side of the first connecting block 604 facing the second slide plate 405. Its driving end is connected to a transverse telescopic rod 606, and a transverse insertion rod 607 is fixed to the end of the transverse telescopic rod 606. During the impact preparation stage, the transverse hydraulic rod 605 drives the transverse telescopic rod 606 to extend outward, so that the transverse insertion rod 607 is inserted into the inner side of the first connecting ring 608. At this time, the impact ball 609 is suspended by the transverse insertion rod 607 and the first connecting ring 608, and the connecting rope 610 is in a slack state. When an impact needs to be applied, the transverse hydraulic rod 605 drives the transverse telescopic rod 606 to retract instantaneously, causing the transverse insertion rod 607 to quickly detach from the first connecting ring 608. After the first connecting ring 608 loses its support, the impact ball 609 falls vertically under the action of gravity, the connecting rope 610 is straightened, and finally the impact ball 609 accurately impacts the force groove 711 of the test mounting component 7, transferring the impact load to the force sensor 708 to be measured.

[0053] As one possible implementation, the impact ball 609 is a replaceable component, and impact balls 609 of different masses can be replaced by removing the fourth fastening screw 613.

[0054] The second connecting ring 611 is detachably connected to the second sliding plate 405 via the second connecting block 612 and the fourth fastening screw 613. When it is necessary to replace the impact ball 609 with one of different mass, simply unscrew the fourth fastening screw 613, remove the second connecting block 612, the second connecting ring 611, and the connecting rope 610 to replace the impact ball hanging on the first connecting ring 608. Impact balls of different masses can generate impact spectra of different energy levels, adapting to light impacts, such as equipment vibration, to heavy impacts, such as mechanical collisions.

[0055] In some embodiments, the test mounting assembly 7 includes: a connecting base plate 701, a second columnar sensor 703, a lower fixing cylinder 705, a first pressure plate 707, a second pressure plate 709, and a pressing cylinder cover 710. The connecting base plate 701 is fixed to the base 1 by a fifth fastening screw 702. The second columnar sensor 703 is disposed at the upper end of the connecting base plate 701. The lower fixing cylinder 705 is connected to the second columnar sensor 703 by a second connecting plate 704, and the lower fixing cylinder 705 is fixed to the second connecting plate 704 by a plurality of sixth fastening screws 706 arranged at equal intervals. The first pressure plate 707 is disposed at the bottom inner side of the lower fixing cylinder 705, and the second pressure plate 709 is disposed above the force sensor 708. The pressing cylinder cover 710 is sleeved on the outside of the second pressure plate 709, and a force-receiving groove 711 is formed on the top of the pressing cylinder cover 710, wherein the force sensor 708 is clamped between the first pressure plate 707 and the second pressure plate 709.

[0056] For example, the second column sensor 703 is configured to provide feedback on the base reaction force borne by the test mounting assembly 7.

[0057] The connecting base plate 701 is fixed to the base 1 by the fifth fastening screw 702. There are usually multiple fifth fastening screws 702 to ensure that there are no gaps or wobbling between the connecting base plate and the base 1, forming a fixed reference surface for the entire assembly. The first pressure plate 707 is located on the inner bottom of the lower fixed cylinder 705. The first pressure plate 707 is usually a rigid flat plate, and its function is to increase the contact area between the force sensor 708 and the lower fixed cylinder 705. If the force sensor 708 directly contacts the bottom of the lower fixed cylinder, uneven contact may lead to localized stress concentration, damaging the sensor or affecting force transmission. The first pressure plate 707 can evenly distribute the force to the lower end face of the sensor.

[0058] The force sensor 708 is placed on top of the first pressure plate 707, and its upper end covers the second pressure plate 709. The second pressure plate 709 is sized to match and arranged in parallel with the first pressure plate 707 to form an upper and lower clamping structure. When an external load (the pressure head 508 of the force application component and the impact ball 609 of the impact component) is applied, the second pressure plate 707 will evenly transfer the load to the upper surface of the sensor, avoiding off-center loading errors caused by the offset of the load application point.

[0059] The pressing cylinder cover 710 is sleeved on the outside of the second pressing plate 709, and the inner diameter of the pressing cylinder cover 710 is larger than the outer diameter of the lower fixed cylinder 705. This allows the pressing cylinder cover 710 to move vertically along the outside of the lower fixed cylinder 705 to accommodate the displacement when the load is applied, while also limiting the lateral offset between the second pressing plate 709 and the force sensor 708 under test, preventing the sensor from tipping over or shifting when under force. At the same time, the detachable nature of the pressing cylinder cover 710 also facilitates the installation and removal of the sensor under test.

[0060] The pressure head 508 of the force testing assembly 5 is aligned with the force groove 711 on the top of the pressing cylinder cover 710. The pressure head 508 applies downward force, which is transmitted to the pressing cylinder cover 710 through the force groove 711. The pressing cylinder cover 710 transmits the force to the inner second pressure plate 709. The second pressure plate 709 acts evenly on the upper surface of the force sensor 708 under test. The force sensor 708 transmits the force to the lower first pressure plate 707, which then transmits the force to the lower fixed cylinder 705. The impact ball 609 of the impact testing assembly 6 strikes the force groove 711 of the pressing cylinder cover 710. The impact kinetic energy is converted into instantaneous pressure through the force groove 711 and transmitted along the path of the pressing cylinder cover 710, the second pressure plate 709, the force sensor 708 under test, the first pressure plate 707, and the lower fixed cylinder 705.

[0061] The device applies an increasing static load to the force sensor 708 through the force testing component 5 and a dynamic impact load to the force sensor 708 through the impact testing component 6. The force sensor testing device constructs a triangular verification model based on the readings of the first column sensor 505, the second column sensor 703 and the force sensor 708.

[0062] The triangular verification model is designed based on Newton's third law and the principle of force balance. It uses the first column sensor 505, the second column sensor 703, and the force sensor 708 to simultaneously collect three independent sets of data: active input force, output force of the sensor under test, and base reaction force. These data form a mutually verifying closed loop, which ultimately determines the performance accuracy of the force sensor 708 under test.

[0063] The active input force F1 collected by the first column sensor 505 and the base reaction force F3 collected by the second column sensor 703 are the core basis for determining whether there is an error in the force sensor testing device. According to Newton's third law, action and reaction forces are equal in magnitude and opposite in direction. In an ideal testing system (no loose parts, no load transmission loss, no installation off-center load), F1 and F3 should be exactly equal. In actual testing, due to minor friction and elastic deformation of the parts, a very small deviation is allowed. Assuming that F1 and F3 are consistent (the force sensor testing device is reliable), the accuracy, linearity, and dynamic response performance of the sensor are judged by comparing the output force F2 of the sensor under test with the average value of F1 / F3. For example:

[0064] For single-level load accuracy assessment, calculate the deviation rate between F2 and the average value of F1 / F3 under each load level (deviation rate = [F2 - (F1 + F3) / 2] / (F1 + F3) / 2 × 100%), and compare it with the rated accuracy class of the sensor. The following uses 0.1 class and 0.5 class as examples:

[0065] If the sensor's rated accuracy is 0.1 grade: the deviation rate must be ≤0.1% (e.g., F1=100N, F3=100.1N, average value=100.05N, F2 must be between 100.04N and 100.06N).

[0066] If the rated accuracy is 0.5 grade: the deviation rate must be ≤0.5% (F2 must be between 99.55N and 100.55N).

[0067] In dynamic scenarios, the impact testing component 6 generates multi-level impact loads using impact balls 609 of different masses (e.g., 1kg, 2kg, 3kg), and calculates the deviation rate between the peak value of F2 and the average value of the peak values ​​of F1 / F3. The allowable range is slightly wider than that for static scenarios. If the sensor's rated dynamic accuracy is 0.5 grade: the deviation rate must be ≤0.5% (e.g., peak value of F1 = 5000N, peak value of F3 = 5005N, average value = 5002.5N, peak value of F2 must be between 4977.5N and 5027.5N). If the deviation rate exceeds the range (e.g., peak value of F2 = 4800N, deviation rate = 4.05%): the sensor's dynamic response is lagging, it cannot accurately capture instantaneous impact loads, and its dynamic performance is unqualified.

[0068] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0069] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A force sensor testing device, characterized in that, include: A base (1) is provided with four columns (2) welded to the upper corners of the base (1) and a connecting top frame (3) welded to the top of two adjacent columns (2); a test mounting assembly (7) is provided at the upper end of the base (1) for mounting the force sensor (708) to be tested; a sliding displacement assembly (4) is provided on the side of the connecting top frame (3) facing the base (1); a force application test assembly (5) and an impact test assembly (6) are provided side by side at the lower end of the sliding displacement assembly (4) and are driven by the sliding displacement assembly (4) to move synchronously, so that the pressure head (508) of the force application test assembly (5) or the impact ball (609) of the impact test assembly (6) can selectively align with the force groove (711) on the test mounting assembly (7). The sliding displacement assembly (4) includes: two slide rails (401), symmetrically arranged on both sides of the connecting top frame (3), each slide rail (401) having a groove (402) on its opposite side; a first slide plate (403) and a second slide plate (405), arranged horizontally side by side between the two slide rails (401), with the ends of the first slide plate (403) and the second slide plate (405) respectively extending into the corresponding groove (402); a connecting rod (404), connecting the first slide plate (403) and the second slide plate (405); a first hydraulic cylinder (409), fixed on the connecting top frame (3), the driving end of the first hydraulic cylinder (409) being connected to the first connecting plate (406) through the first piston rod (408), and the first connecting plate (406) being detachably connected to the first slide plate (403) through the first fastening screw (407); The force testing assembly (5) includes: a second hydraulic cylinder (501) fixed on the first slide plate (403), with a second piston rod (502) connected to the drive end of the second hydraulic cylinder (501); a first column sensor (505) connected to the second piston rod (502) via a first connecting pad (503), with the first connecting pad (503) fixed to the second piston rod (502) via a plurality of rings arranged at equal intervals with second fastening screws (504); and a pressure head (508) connected to the first column sensor (505) via a second connecting pad (506), with the second connecting pad (506) fixed to the first column sensor (505) via a plurality of rings arranged at equal intervals with third fastening screws (507). The impact testing assembly (6) includes: a connecting support frame (601), the bottom of which is welded and fixed to the upper end of the second sliding plate (405), the connecting support frame (601) being L-shaped; a longitudinal hydraulic rod (602), disposed at the lower end of the top L-shaped side of the connecting support frame (601), the output end of which is connected to a longitudinal telescopic rod (603); and a first connecting block (604), disposed on the longitudinal telescopic rod (603). One end away from the longitudinal hydraulic rod (602); a transverse hydraulic rod (605), disposed on the side of the first connecting block (604) facing the second slide plate (405), the driving end of the transverse hydraulic rod (605) is connected to a transverse telescopic rod (606); a transverse insertion rod (607), disposed at the end of the transverse telescopic rod (606) away from the transverse hydraulic rod (605); an impact ball (609), suspended below the transverse insertion rod (607) by a first connecting ring (608); The impact testing assembly (6) further includes a connecting rope (610), a second connecting ring (611), and a second connecting block (612). The two ends of the connecting rope (610) are respectively connected to the first connecting ring (608) and the second connecting ring (611). The second connecting ring (611) is detachably connected to the second slide plate (405) through the second connecting block (612) and the fourth fastening screw (613).

2. A force sensor testing device according to claim 1, wherein, The test installation assembly (7) includes: a connecting base plate (701) fixed to the base (1) by a fifth fastening screw (702); a second column sensor (703) disposed at the upper end of the connecting base plate (701); a lower fixing cylinder (705) connected to the second column sensor (703) by a second connecting plate (704), the lower fixing cylinder (705) being fixed to the second connecting plate (704) by a plurality of rings equidistantly arranged sixth fastening screws (706); a first pressure plate (707) disposed at the bottom inner side of the lower fixing cylinder (705); a second pressure plate (709) disposed above the force sensor (708); and a pressing cylinder cover (710) sleeved on the outside of the second pressure plate (709), the pressing cylinder cover (710) having a force groove (711) on its top, wherein the force sensor (708) is clamped between the first pressure plate (707) and the second pressure plate (709).

3. A force sensor testing device according to claim 1, wherein, The first column sensor (505) is configured to monitor the input force value applied by the force testing component (5) in real time.

4. A force sensor testing device according to claim 2, wherein, The second column sensor (703) is configured to provide feedback on the base reaction force borne by the test mounting assembly (7).

5. The force sensor testing device of claim 1, wherein, The impact ball (609) is a replaceable component, and impact balls (609) of different masses can be replaced by removing the fourth fastening screw (613).

6. A force sensor testing device according to claim 2, wherein, The device applies an increasing static load to the force sensor (708) through the force testing component (5) and applies a dynamic impact load to the force sensor (708) through the impact testing component (6). The force sensor testing device constructs a triangular verification model based on the readings of the first column sensor (505), the second column sensor (703) and the force sensor (708).

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