Sensor calibration tool

Abstract

The utility model discloses a sensor calibration tool, and relates to the field of sensor calibration tools. The device comprises a supporting frame, a transmission belt is arranged on the supporting frame, a traction block is installed on one side of the supporting frame in a sliding mode, a movable plate is installed on one side of the traction block, a limiting mechanism is installed on the outer side of the supporting frame in a locking mode, the limiting mechanism comprises an installation frame, a movable frame is arranged on one side of the installation frame in a telescopic mode, and the movable plate is arranged on the other side of the installation frame. The traction block is driven by the transmission belt to drive the movable plate to move, the calibration distance is continuously adjustable, the clamping rod of the limiting mechanism is directly connected with the traction block in a hooked mode, the position of the traction block is physically locked, the problem of position drifting caused by driving of a servo motor is thoroughly solved, meanwhile, the traction block is driven by the clamping rod, and the calibration accuracy is improved. The installation frame is in sliding connection with the supporting frame through the sliding block and is fixed through the fastening hand wheel, and therefore the limiting point can be flexibly adjusted according to the identification scales.

Description

Technical Field

[0001] This utility model relates to the field of sensor calibration fixtures, specifically a sensor calibration fixture. Background Technology

[0002] Sensor calibration fixtures are specialized equipment used to calibrate sensor performance. By comparing standard input signals with sensor output signals, parameters such as sensitivity, linearity, and accuracy are determined.

[0003] A search revealed that publication number CN112985331B, entitled "A Calibration Device for a Sensor," describes a method where, during the calibration of a sensor, a translational drive mechanism moves a calibration plate along a slide rail to continuously change the distance between the calibration plate and the sensor. During the movement of the calibration plate, a position sensor continuously detects the position coordinates of the slider, and by calculating these coordinates, the sensor can be dynamically calibrated. This improves calibration efficiency while achieving dynamic calibration. However, a problem exists in practical use: the calibration plate is slidably connected to the slide rail via a slider and is mounted via a servo motor. The position of the calibration plate relies entirely on the drive of the servo motor, inevitably leading to instability in its position. Therefore, the inventor urgently needs to design a limiting mechanism to stabilize the calibration plate and improve its accuracy during calibration operations. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a sensor calibration fixture to solve the technical problem of unstable position of the calibration board caused by servo motor drive.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sensor calibration fixture, including a support frame, a transmission belt on the support frame, a traction block slidably mounted on one side of the support frame, a movable plate mounted on one side of the traction block, a limiting mechanism locked on the outer side of the support frame, the limiting mechanism including a mounting frame, a movable frame retractably mounted on one side of the mounting frame, and the upper side of the movable frame hooked to the traction block via a clamping rod to limit the position of the traction block.

[0006] By adopting the above technical solution, the transmission system consisting of the support frame and the transmission belt drives the traction block to slide, enabling the movable plate to move along a preset path, providing a dynamically adjustable calibration distance environment for the sensor to be calibrated. At the same time, the innovative design of the limiting mechanism supports the telescopic movable frame through the mounting frame, and uses the hook action between the clamp and the traction block to directly mechanically lock the displacement degree of freedom of the traction block. This structure, based on the servo motor drive, superimposes physical limiting, effectively suppressing the position drift of the calibration plate caused by transmission gap or load changes, and significantly improving the positioning stability of the calibration process.

[0007] Furthermore, the inner side of the mounting bracket is slidably mounted to the support frame via a slider, and the mounting bracket is securely mounted to the support frame via a fastening handwheel.

[0008] By adopting the above technical solution, the mounting bracket achieves free positioning of the limiting mechanism within the calibrated stroke range through the sliding cooperation between the inner slider and the support frame, which is convenient to adapt to the calibration requirements of different distances. At the same time, the locking setting of the fastening handwheel allows the operator to quickly fix the position of the mounting bracket and ensure the rigid transmission of the limiting action.

[0009] Furthermore, both sides of the support frame are provided with marking scales, and the top surface of the mounting frame is flush with the top surface of the movable plate. The marking scales on the top surface of the mounting frame correspond to the longitudinal position of the movable plate.

[0010] By adopting the above technical solution, the markings on both sides of the support frame are aligned with the top surface of the mounting frame and the upper surface of the movable plate, forming an intuitive visual positioning system. This allows operators to directly read the longitudinal position of the movable plate based on the markings aligned with the top surface of the mounting frame.

[0011] Furthermore, a connecting plate is provided on one side of the mounting bracket and the movable bracket, and a tension spring is elastically connected between them.

[0012] By adopting the above technical solution, the elastic connection system formed by the connecting plate and the tension spring enables the movable frame to have the ability to automatically reset: in the non-limited state, the tension spring pulls the movable frame to keep it contracted, avoiding interference with the moving traction block.

[0013] Furthermore, several limiting mechanisms are provided to lock the device at the required scale marking position, ensuring that the retracted state of the movable frame does not conflict with the sliding trajectory of the traction block.

[0014] By adopting the above technical solution, the distributed layout of multiple limiting mechanisms along the support frame allows for the setting of physical locking positions at any key location within the calibration range, thus meeting the calibration requirements for multiple distance parameters.

[0015] Furthermore, a top mounting plate is installed on the top of the support frame, and the bottom surface of the top mounting plate is detachably equipped with a sensor to be calibrated and several distance sensors. The distance sensors are used to detect the distance between the detection starting point of the sensor to be calibrated and the movable plate.

[0016] By adopting the above technical solution, the top mounting plate integrates the sensor to be calibrated and the ranging sensor into a unified layout, and establishes a synchronous data acquisition system for calibration: the ranging sensor directly monitors the real-time distance between the movable plate and the detection starting point of the sensor to be calibrated, providing independent verification data for calibration parameters. At the same time, it can be detachably installed to adapt to different models of sensors and quickly switch calibration objects.

[0017] Furthermore, a base plate is provided on the bottom surface of the support frame, and a servo motor is installed on one side below the support frame, with the output end of the servo motor being connected to a transmission belt.

[0018] By adopting the above technical solution, the base plate provides a stable foundation platform for the support frame, and the vibration interference during the transmission process is suppressed by increasing the overall rigidity and lowering the center of gravity.

[0019] In summary, the present invention has the following main advantages:

[0020] 1. This utility model uses a transmission belt to drive a traction block to move a movable plate, achieving continuous adjustment of the calibration distance. The limit mechanism's locking rod directly hooks onto the traction block, physically locking its position and completely solving the position drift problem caused by the servo motor drive. At the same time, the mounting frame is slidably connected to the support frame via a slider and fixed by a fastening handwheel, allowing the limit point to be flexibly adjusted according to the marking scale. The alignment of the top surface of the mounting frame with the upper surface of the movable plate ensures that the scale value directly reflects the longitudinal position of the movable plate, eliminating manual reading errors.

[0021] 2. This utility model directly detects the distance between the sensor to be calibrated and the movable plate through the distance measuring sensor integrated in the top mounting plate, providing independent verification for calibration data; the detachable design is compatible with different sensor models. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a side view of the structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the limiting mechanism of this utility model;

[0025] Figure 4 This utility model Figure 2 A magnified structural diagram of point A in the middle.

[0026] In the diagram: 1. Support frame; 2. Transmission belt; 301. Traction block; 302. Movable plate; 4. Top mounting plate; 501. Sensor to be calibrated; 502. Distance sensor; 6. Limiting mechanism; 601. Mounting frame; 602. Slider; 603. Movable frame; 604. Connecting plate; 605. Tension spring; 606. Locking rod; 607. Fastening handwheel; 7. Base plate. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In this embodiment:

[0029] A sensor calibration fixture, such as Figure 1-4 As shown, the system includes a support frame 1, on which a transmission belt 2 is mounted. A traction block 301 is slidably mounted on one side of the support frame 1, and a movable plate 302 is mounted on one side of the traction block 301. A limiting mechanism 6 is locked onto the outer side of the support frame 1. The limiting mechanism 6 includes a mounting frame 601, on which a movable frame 603 is retractably mounted. The upper side of the movable frame 603 is hooked to the traction block 301 via a latch 606 to limit the position of the traction block 301. The transmission system consisting of the support frame 1 and the transmission belt 2 drives the traction block 301 to slide, allowing the movable plate 302 to move along a preset path. The fixed sensor 501 provides a dynamically adjustable calibration distance environment. Meanwhile, the innovative design of the limiting mechanism 6 supports the telescopic movable frame 603 through the mounting bracket 601, and directly mechanically locks the displacement degree of freedom of the traction block 301 by using the hook action of the locking rod 606 and the traction block 301. This structure superimposes physical limiting on the basis of servo motor drive, effectively suppressing the position drift of the calibration plate caused by transmission gap or load changes, and significantly improving the positioning stability of the calibration process. In addition, the synergistic effect of mechanical limiting and dynamic transmission avoids the unreliability of relying solely on motor locking in traditional solutions, providing double protection for high-precision calibration.

[0030] See Figure 1 , Figure 2 , Figure 3 , Figure 4The inner side of the mounting bracket 601 is slidably installed with the support frame 1 via the slider 602. The mounting bracket 601 is fastened to the support frame 1 via the fastening handwheel 607. The mounting bracket 601 achieves free positioning of the limiting mechanism 6 within the calibrated stroke range through the sliding cooperation between the inner slider 602 and the support frame 1, which is convenient to adapt to the calibration requirements of different distances. At the same time, the locking setting of the fastening handwheel 607 allows the operator to quickly fix the position of the mounting bracket 601, ensuring the rigid transmission of the limiting action. This not only simplifies the limit point adjustment process, but also prevents the mounting bracket 601 from shifting through the guiding effect of the slider 602, ensuring the hooking accuracy between the clamp 606 and the traction block 301.

[0031] See Figure 1 , Figure 2 , Figure 3 , Figure 4 Both sides of the support frame 1 are marked with scales. The top surface of the mounting frame 601 is flush with the upper surface of the movable plate 302. The scales on the top surface of the mounting frame 601 correspond to the longitudinal position of the movable plate 302. The setting of the scales on both sides of the support frame 1 being flush with the top surface of the mounting frame 601 and the upper surface of the movable plate 302 forms an intuitive visual positioning system, allowing operators to directly read the longitudinal position of the movable plate 302 according to the scale value aligned with the top surface of the mounting frame 601. At the same time, this scale alignment mechanism combines mechanical limit and position feedback into one, which not only eliminates the error accumulation of additional position sensors in traditional solutions, but also avoids the inaccuracy of calibration parameters caused by manual reading deviation.

[0032] See Figure 3 , Figure 4 A connecting plate 604 is provided on one side of the mounting frame 601 and the movable frame 603, and a tension spring 605 is elastically connected between them. The elastic connection system formed by the connecting plate 604 and the tension spring 605 enables the movable frame 603 to have an automatic reset capability: in the non-limited state, the tension spring 605 pulls the movable frame 603 to keep it contracted, avoiding interference with the moving traction block 301. At the same time, the elastic mechanism provides a buffer stroke during the limit action. When the latch 606 hooks the traction block 301, the tension spring 605 can absorb part of the impact energy, which reduces mechanical collision loss and ensures the smoothness of the hooking process.

[0033] See Figure 1 , Figure 2Several limiting mechanisms 6 are provided to lock the device at the required scale mark position. When the movable frame 603 is in the retracted state, it does not conflict with the sliding trajectory of the traction block 301. The distributed layout of multiple limiting mechanisms 6 along the support frame 1 allows for the setting of physical locking positions at any key location within the full calibration range, meeting the calibration requirements of multiple distance parameters. At the same time, the movable frame 603 completely avoids the sliding trajectory of the traction block 301 in the retracted state, allowing the movable plate 302 to move continuously between different limiting points without repeatedly disassembling and assembling the limiting mechanisms 6. This design retains the efficiency of dynamic calibration and can switch to static locking mode instantly at the target position.

[0034] See Figure 1 , Figure 2 A top mounting plate 4 is installed on the top of the support frame 1. The bottom surface of the top mounting plate 4 is detachably equipped with a sensor 501 to be calibrated and several distance sensors 502. The distance sensors 502 are used to detect the distance between the detection starting point of the sensor 501 to be calibrated and the movable plate 302. The top mounting plate 4 integrates the sensor 501 to be calibrated and the distance sensors 502 into an integrated layout, establishing a synchronous data acquisition system for calibration: the distance sensors 502 directly monitor the real-time distance between the movable plate 302 and the detection starting point of the sensor 501 to be calibrated, providing independent verification data for calibration parameters. At the same time, it can be detachably installed to adapt to different models of sensors, allowing for quick switching of calibration objects. In addition, the feedback data of the distance sensors 502 and the mechanical positioning of the limit mechanism 6 form a dual verification mechanism, which can correct the position control error of the servo motor and verify the actual offset of the movable plate 302 in the locked state, thus constructing a closed-loop calibration accuracy assurance system.

[0035] See Figure 1 , Figure 2 The bottom surface of the support frame 1 is provided with a base plate 7. A servo motor is installed on one side below the support frame 1, and the output end of the servo motor is connected to the transmission belt 2. The base plate 7 provides a stable foundation platform for the support frame 1. By increasing the overall rigidity and lowering the center of gravity, vibration interference during the transmission process is suppressed. At the same time, the direct drive method between the servo motor and the transmission belt 2 ensures the linear controllability of the moving speed of the movable plate 302, creating uniform motion conditions for dynamic calibration. In addition, the high response characteristics of the motor and belt drive system support the rapid reciprocating motion of the movable plate 302 between the limit points.

[0036] The implementation principle of this embodiment is as follows: the servo motor at the bottom of the support frame 1 drives the transmission belt 2, which drives the traction block 301 connected to it to slide along the support frame 1. The movable plate 302 installed on the traction block 301 moves accordingly, realizing the dynamic adjustment of the calibration distance. During the movement, the distance sensor 502 at the bottom of the top mounting plate 4 detects the distance between the movable plate 302 and the sensor 501 to be calibrated in real time.

[0037] When the movable plate 302 needs to be stably calibrated in a specific position, the operator slides the mounting bracket 601 of the limiting mechanism 6 to the designated position marked on the scale on both sides of the support frame 1 via the slider 602, and locks it in place with the fastening handwheel 607. Then, the operator pulls the movable frame 603 to extend it outward against the elastic force of the tension spring 605, and hooks the side edge of the traction block 301 through the locking rod 606, thereby mechanically locking the position of the traction block 301 and the movable plate 302. At this time, the top surface of the mounting bracket 601 is aligned with the upper surface of the movable plate 302, and its position scale directly corresponds to the longitudinal calibrated position of the movable plate 302.

[0038] After calibration is completed, the movable frame 603 is released, and the tension spring 605 automatically pulls it back to the retracted state to avoid conflict with the subsequent movement trajectory of the traction block 301. Multiple limit mechanisms 6 can be installed at different scale positions on the support frame 1 as needed, and the base plate 7 provides overall stability support. This process combines dynamic adjustment and mechanical limit to ensure accurate and reliable calibration position.

[0039] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A sensor calibration fixture, characterized in that: The system includes a support frame (1), on which a transmission belt (2) is provided. A traction block (301) is slidably installed on one side of the support frame (1), and a movable plate (302) is installed on one side of the traction block (301). A limiting mechanism (6) is locked on the outside of the support frame (1). The limiting mechanism (6) includes a mounting frame (601). A movable frame (603) is telescopically provided on one side of the mounting frame (601). The upper side of the movable frame (603) is hooked to the traction block (301) through a clamp (606) to limit the position of the traction block (301).

2. The sensor calibration fixture according to claim 1, characterized in that: The inner side of the mounting bracket (601) is slidably mounted to the support frame (1) via a slider (602), and the mounting bracket (601) is fastened to the support frame (1) via a fastening handwheel (607).

3. The sensor calibration fixture according to claim 1, characterized in that: The support frame (1) has markings on both sides. The top surface of the mounting frame (601) is flush with the upper surface of the movable plate (302). The markings on the top surface of the mounting frame (601) correspond to the longitudinal position of the movable plate (302).

4. The sensor calibration fixture according to claim 1, characterized in that: A connecting plate (604) is provided on one side of the mounting bracket (601) and the movable bracket (603), and a tension spring (605) is elastically connected between them.

5. The sensor calibration fixture according to claim 1, characterized in that: The limiting mechanism (6) is provided in several parts to lock at the required scale mark position. When the movable frame (603) is in the retracted state, it does not conflict with the sliding trajectory of the traction block (301).

6. The sensor calibration fixture according to claim 1, characterized in that: The top of the support frame (1) is equipped with a top mounting plate (4). The bottom surface of the top mounting plate (4) is detachably equipped with a sensor to be calibrated (501) and several distance sensors (502). The distance sensors (502) are used to detect the distance between the detection starting point of the sensor to be calibrated (501) and the movable plate (302).

7. The sensor calibration fixture according to claim 1, characterized in that: The bottom surface of the support frame (1) is provided with a base plate (7), and a servo motor is installed on one side below the support frame (1), and the output end of the servo motor is connected to the transmission belt (2).

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