A calibration device for an acceleration sensor

Abstract

This invention relates to the field of sensor calibration technology, and more particularly to a calibration device for an accelerometer, comprising a vibration table for simulating a vibration environment to calibrate the accelerometer. The vibration table has multiple locking slots on one side of its inner wall, and a displacement chamber for automatic movement of the accelerometer is located at the bottom of its inner cavity. A locking mechanism is also provided, located on one side of the vibration table, and includes a clamping lock. In this invention, the clamping lock can fix the accelerometer in the inner cavity of the locking slots, ensuring that the position of the accelerometer remains unchanged during the test, thereby eliminating the influence of position changes on the test results and improving test accuracy. Simultaneously, after the clamping lock stops fixing the accelerometer, the sensor can move freely, fully simulating the dynamic working state in actual applications and accurately evaluating the sensor's response characteristics under different vibration frequencies and displacements.

Description

Technical Field

[0001] The invention relates to the technical field of sensor calibration, and in particular to a calibration device for an acceleration sensor. Background Art

[0002] An accelerometer is a device used to measure acceleration and is widely used in aerospace, automotive safety, motion tracking, industrial automation, earthquake monitoring and other fields. Its core function is to accurately sense and convert changes in the acceleration of an object into electrical signals for subsequent data processing and analysis. In order to ensure the measurement accuracy and reliability of the accelerometer, regular calibration is a crucial step. In the prior art, the calibration of accelerometers usually relies on standard test equipment. The vibration table has become a common method for calibrating accelerometers because it can simulate a variety of vibration environments and frequencies. On the vibration table, by applying a vibration signal of known frequency and amplitude, the output response of the sensor is observed and recorded, and then compared with the theoretical value or standard value, the performance indicators such as the measurement accuracy and linearity of the sensor are evaluated.

[0003] Traditional vibration table calibration methods often only provide a fixed test mode, that is, the sensor is firmly mounted on the vibration table and the position is relatively fixed. In this mode, although the sensor position can be ensured to remain unchanged during the test, which is convenient for data comparison and analysis, it is difficult to fully simulate the dynamic working state of the sensor in actual applications. Especially in situations where dynamic displacement needs to be detected, the limitations of the fixed mode are particularly obvious, and it is impossible to accurately evaluate the response characteristics of the sensor under different vibration frequencies and displacements. Due to the limitations of the fixed mode, it is difficult for existing technologies to effectively capture and evaluate the performance of acceleration sensors in dynamic environments, such as the displacement sensitivity, dynamic response time and stability of the sensor during vibration. Key parameters. The lack of these parameters may lead to an incomplete understanding of sensor performance, which in turn affects subsequent application selection and performance optimization. Summary of the invention

[0004] The object of the present invention is to provide a calibration device for an acceleration sensor to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A calibration device for an acceleration sensor, comprising:

[0007] A vibration table, wherein the vibration table is used to simulate a vibration environment to perform calibration test on the acceleration sensor, a plurality of locking grooves are provided on one side of the inner wall of the vibration table, and a shifting bin for automatic movement of the acceleration sensor is provided at the bottom of the inner cavity of the vibration table;

[0008] A locking mechanism, wherein the locking mechanism is arranged on one side of the vibration table, the locking mechanism includes a clamping lock, the clamping lock is used to fix the acceleration sensor to prevent it from moving, and the clamping lock is arranged in the inner wall of the locking groove, the clamping lock includes a transmission bin, the bottom of the transmission bin is movably connected with two linkage plates, a clamping ring is arranged on one side of the linkage plate, and the two clamping rings form an annular lock for locking the acceleration sensor.

[0009] A reset mechanism is used to reset the position of the acceleration sensor after the acceleration sensor calibration test is completed, and the reset mechanism is arranged in the inner cavity of the shift bin.

[0010] Preferably, the reset mechanism includes a movable frame, second reset springs are respectively provided on both sides of the movable frame, one end of the second reset spring is connected to a fixed seat, the movable frame includes a slide rail, an inner cavity of the slide rail is provided with a mounting frame, the acceleration sensor is installed on the top of the mounting frame, the inner cavity of the slide rail is also provided with a plurality of baffles, and the mounting frame and the baffle are connected through a first reset spring.

[0011] Preferably, a gear is provided inside the transmission bin, and a first rack and a second rack are respectively provided on both sides of the gear, the inner sides of the first rack and the second rack are meshed with the outer edge of the gear, and the bottom of the second rack and the gear are respectively fixedly connected to the top ends of the two linking plates.

[0012] Preferably, the locking mechanism also includes a servo motor, a main pulley is provided at the output end of the servo motor, at least two belt strips are provided on the outer side of the main pulley, a secondary pulley is provided on the inner wall of one end of the belt strip, the wrap angle between the belt strip and the main pulley and the secondary pulley is greater than 120°, the bottom of the secondary pulley is fixedly connected to a driving shaft, and the top of the driving shaft is fixedly connected to a gear.

[0013] Preferably, calibration parts are provided at both ends of the movable frame, and sliding grooves for sliding the calibration parts are provided at both ends of the inner wall of the shift bin, the calibration part includes an outer shell, an inner cavity of the outer shell is provided with a card seat, the inner wall of the sliding groove is provided with a positioning part, the positioning part includes a shell, an inner cavity of the shell is provided with an embedded block, and a first spring is provided on one side of the embedded block.

[0014] Preferably, both sides of the shell are set to be oblique angles, and both sides of the embedded block are also set to be oblique angles. The inner cavity of the shell is located on one side of the card embedding seat and a second spring is provided. The elastic force of the second spring is greater than the elastic force of the first spring. The inner wall of the slide rail is also provided with a positioning piece, and corresponding calibration pieces are provided on both sides of the mounting frame that contact the inner wall of the slide rail.

[0015] Preferably, a locking plate is provided at the top of the inner cavity of the slide groove, a bolt is provided at the top of the locking plate, and the contact surfaces of the shell and the locking plate are provided with mutually matching brake blocks.

[0016] Preferably, a rubber pad is provided on the inner side of the clamp ring, and a number of anti-sliding blocks are provided on the inner side of the rubber pad.

[0017] Preferably, a torsion spring is provided on one side of the two linkage plates, and one end of the torsion spring is fixedly connected to the inner wall of the locking groove.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, the acceleration sensor can be fixed in the inner cavity of the locking groove by the clamping lock, ensuring that the position of the acceleration sensor remains unchanged during the test process, thereby eliminating the influence of position change on the test result and improving the test accuracy. At the same time, after the acceleration sensor is stopped from being fixed by the clamping lock, the sensor can move freely, fully simulating the dynamic working state in actual application, and accurately evaluating the response characteristics of the sensor under different vibration frequencies and displacements;

[0020] 2. In the present invention, when the acceleration sensor is not fixed, after the test is completed, the acceleration sensor can be reset to the initial position through the reset mechanism, eliminating the influence of the position change on the test result, further improving the accuracy of the test, and at the same time, the reset mechanism can also prevent the acceleration sensor from colliding with or being damaged by other components due to excessive position deviation, thereby ensuring the safety and stability of the test;

[0021] 3. In the present invention, a calibration piece is provided on the reset mechanism. During the resetting process of the acceleration sensor, the cooperation between the calibration piece and the positioning piece ensures that the acceleration sensor is successfully reset to the initial position. By moving the positioning piece, the initial position of the acceleration sensor can be repositioned as needed, thereby ensuring the stability and controllability of the acceleration sensor during the test and improving the flexibility and applicability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 The overall structural diagram of the locking mechanism;

[0024] Figure 3 For the present invention Figure 2 Schematic diagram of the overall structure of the clamping lock;

[0025] Figure 4 For the present invention Figure 2Schematic diagram of the internal structure of the middle transmission compartment;

[0026] Figure 5 It is a partial enlarged schematic diagram of the vibration table of the present invention;

[0027] Figure 6 For the present invention Figure 5 Schematic diagram of the overall structure of the mobile rack;

[0028] Figure 7 For the present invention Figure 5 Schematic diagram of the overall structure of the calibration piece;

[0029] Figure 8 For the present invention Figure 5 A partial enlarged schematic diagram of the middle shift bin;

[0030] In the figure: 1, vibration table; 11, locking groove; 12, shifting bin; 121, slide groove; 122, locking plate; 123, bolt; 13, positioning member; 131, housing; 132, first spring; 133, embedded block; 2, reset mechanism; 21, moving frame; 211, slide rail; 212, mounting frame; 213, baffle; 214, first reset spring; 22, fixing seat; 23, second reset spring; 24, calibration member; 2 41. Housing; 242. Second spring; 243. Snap-in seat; 3. Acceleration sensor; 4. Locking mechanism; 41. Servo motor; 42. Main pulley; 43. Belt strip; 44. Secondary pulley; 45. Clamping lock; 451. Transmission bin; 452. Linking plate; 453. Clamping ring; 454. Rubber pad; 455. Torsion spring; 456. Drive shaft; 457. First rack; 458. Second rack; 459. Gear. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] See also Figure 1-Figure 8 , the present invention provides a technical solution:

[0034] A calibration device for an acceleration sensor, comprising:

[0035] A vibration table 1, the vibration table 1 is used to simulate a vibration environment to perform calibration test on the acceleration sensor 3, a plurality of locking grooves 11 are provided on one side of the inner wall of the vibration table 1, and a shifting bin 12 for automatic movement of the acceleration sensor 3 is provided at the bottom of the inner cavity of the vibration table 1;

[0036] The locking mechanism 4 is arranged on one side of the vibration table 1. The locking mechanism 4 includes a clamping lock 45. The clamping lock 45 is used to fix the acceleration sensor 3 to prevent it from moving, and the clamping lock 45 is arranged in the inner wall of the locking groove 11. The clamping lock 45 includes a transmission bin 451. The bottom of the transmission bin 451 is movably connected with two linkage plates 452. A clamping ring 453 is arranged on one side of the linkage plate 452. The two clamping rings 453 form an annular lock for locking the acceleration sensor 3.

[0037] The reset mechanism 2 is used to reset the position of the acceleration sensor 3 after the calibration test of the acceleration sensor 3 is completed. The reset mechanism 2 is arranged in the inner cavity of the shift bin 12.

[0038] In this embodiment, please refer to Figure 5-Figure 6 The reset mechanism 2 includes a moving frame 21, and second reset springs 23 are respectively arranged on both sides of the moving frame 21. One end of the second reset spring 23 is connected to a fixed seat 22. The moving frame 21 includes a slide rail 211. The inner cavity of the slide rail 211 is provided with a mounting frame 212. The acceleration sensor 3 is installed on the top of the mounting frame 212. The inner cavity of the slide rail 211 is also provided with a plurality of baffles 213. The mounting frame 212 and the baffle 213 are connected through a first reset spring 214. In this embodiment, when the vibration table 1 simulates a vibration environment, the mounting frame 212 is connected to the baffle 213. The frame 212 can move laterally along the inner wall of the slide rail 211 and squeeze the first return spring 214 to cause it to deform. The movable frame 21 can move longitudinally along the inner wall of the shift bin 12 and squeeze the second return spring 23 to cause it to deform. When the acceleration sensor 3 is not fixed, the vibration environment is simulated by the vibration table 1 to detect the response of the acceleration sensor 3 under different vibration frequencies and displacements. After the test is completed, the first return spring 214 and the second return spring 23 both rebound to return the acceleration sensor 3 to its original position.

[0039] In this embodiment, please refer to Figure 3-Figure 4A gear 459 is provided inside the transmission compartment 451, and a first rack 457 and a second rack 458 are provided on both sides of the gear 459, and the inner sides of the first rack 457 and the second rack 458 are meshed with the outer edge of the gear 459, and the bottoms of the second rack 458 and the gear 459 are respectively fixedly connected to the top ends of the two linkage plates 452. In this embodiment, by controlling the rotation of the gear 459, since it meshes with the second rack 458 and the first rack 457, it can drive the second rack 458 and the first rack 457 to move, and by controlling the rotation direction of the gear 459, the first rack 457 and the second rack 458 can drive the two linkage plates 452 to move closer to or apart from each other, thereby adjusting the spacing of the clamping ring 453, which is used to clamp or loosen the acceleration sensor 3.

[0040] In this embodiment, please refer to Figure 2-Figure 4 The locking mechanism 4 also includes a servo motor 41, a main pulley 42 is provided at the output end of the servo motor 41, at least two belt strips 43 are provided on the outer side of the main pulley 42, a secondary pulley 44 is provided on the inner wall of one end of the belt strip 43, the wrap angle between the belt strip 43 and the main pulley 42 and the secondary pulley 44 is greater than 120°, a driving shaft 456 is fixedly connected to the bottom of the secondary pulley 44, and the top of the driving shaft 456 is fixedly connected to the gear 459. In this embodiment, the servo motor 41 provides power to drive multiple gears 459 to rotate, thereby fixing or loosening multiple acceleration sensors 3 at the same time.

[0041] In this embodiment, please refer to Figure 5 , Figure 7 , Figure 8 , calibration pieces 24 are provided at both ends of the mobile frame 21, and slide grooves 121 for the calibration piece 24 to slide are provided at both ends of the inner wall of the shift bin 12, the calibration piece 24 includes a shell 241, and the inner cavity of the shell 241 is provided with a card embedding seat 243, and the inner wall of the slide groove 121 is provided with a positioning piece 13, and the positioning piece 13 includes a shell 131, and the inner cavity of the shell 131 is provided with an embedded block 133, and one side of the embedded block 133 is provided with a first spring 132. In this embodiment, when the mobile frame 21 is due to the elastic force of the second return spring 23, During resetting, when the calibration part 24 moves to the positioning part 13, the embedding block 133 is first squeezed to move it backward, and the first spring 132 is squeezed to deform it. Then, under the elastic force of the first spring 132, the embedding block 133 enters the inner cavity of the card seat 243, so that the position of the moving frame 21 is fixed to avoid position deviation when the moving frame 21 is reset. The inner wall of the slide rail 211 is also provided with a positioning part 13, and the mounting frame 212 is provided with matching calibration parts 24 on both sides of the contact with the inner wall of the slide rail 211.

[0042] In this embodiment, please refer to Figure 7-Figure 8, both sides of the shell 241 are set at an oblique angle, and both sides of the embedded block 133 are also set at an oblique angle. The inner cavity of the shell 241 is located on one side of the card embedding seat 243 and is provided with a second spring 242. The elastic force of the second spring 242 is greater than the elastic force of the first spring 132. The inner wall of the slide rail 211 is also provided with a positioning member 13, and the mounting frame 212 is provided with a matching calibration member 24 on both sides of the contact with the inner wall of the slide rail 211. In this embodiment, by setting both sides of the embedded block 133 and the shell 241 to an oblique angle, when the embedded block 133 contacts the calibration member 24, it is easy to push the embedded block 133 to move backward. At the same time, because the elastic force of the second spring 242 is greater than the first spring 132 The elastic force of the second spring 242 is such that when the embedded block 133 enters the inner cavity of the card embedding seat 243 for the first time, the card embedding seat 243 will be pushed to move backward and squeeze the second spring 242, so that the embedded block 133 extends into the inner cavity of the shell 241, so that the movable frame 21 can stop moving and lock the position instantly. Then, due to the large elastic force of the second spring 242, the second spring 242 gradually returns to its original state, so that the card embedding seat 243 moves forward and pushes the embedded block 133 to move forward, so that the embedded block 133 no longer penetrates into the inner cavity of the shell 241, but only maintains the connection, ensuring that when the vibration table 1 simulates the vibration environment again, the movable frame 21 can drive the acceleration sensor 3 to move under the influence of vibration.

[0043] In this embodiment, please refer to Figure 8 A locking plate 122 is provided at the top of the inner cavity of the slide groove 121, and a bolt 123 is provided at the top of the locking plate 122. The contact surfaces of the shell 131 and the locking plate 122 are provided with mutually adapted brake blocks. In this embodiment, when the locking plate 122 is in contact with the shell 131 by rotating the bolt 123, the position of the shell 131 can be locked. When the locking plate 122 is moved upward and no longer in contact with the shell 131 by rotating the bolt 123, the position of the shell 131 can be adjusted, so that the initial position of the acceleration sensor 3 can be repositioned as needed by re-locking the position of the positioning member 13.

[0044] In this embodiment, please refer to Figure 3 A rubber pad 454 is provided on the inner side of the clamp ring 453, and a number of anti-sliding blocks are provided on the inner side of the rubber pad 454. In this embodiment, when the clamp ring 453 clamps and fixes the acceleration sensor 3, the rubber pad 454 is tightly attached to the outer side of the acceleration sensor 3. Due to the flexible material of the rubber pad 454, damage to the outer side of the acceleration sensor 3 can be avoided. At the same time, the resistance of the rubber pad 454 is relatively large, and the fixing effect is strong when combined with the anti-sliding block.

[0045] In this embodiment, please refer to Figure 3A torsion spring 455 is provided on one side of the two linking plates 452, and one end of the torsion spring 455 is fixedly connected to the inner wall of the locking groove 11. In this embodiment, by providing the torsion spring 455, when the two linking plates 452 are close to each other, the torsion spring 455 is stretched and deformed, so that when the servo motor 41 stops providing power, the torsion spring 455 loses pressure and rebounds, so that the two linking plates 452 can be quickly separated, and the acceleration sensor 3 stops being fixed.

[0046] Working principle of the present invention:

[0047] Step 1: Push the moving frame 21 to move the acceleration sensor 3 forward so that one end of the acceleration sensor 3 enters the inner cavity of the locking groove 11. At the same time, the moving frame 21 moves forward to squeeze the second return spring 23 to deform it. When one end of the acceleration sensor 3 enters the inner cavity of the locking groove 11, the servo motor 41 provides power to drive the gear 459 to rotate. Since the first rack 457 and the second rack 458 that mesh with each other are respectively provided on both sides of the gear 459, the first rack 457 and the second rack 458 can be driven to move by controlling the rotation of the gear 459, and the first rack 457 and the second rack 458 can be driven to move toward each other by controlling the rotation direction of the gear 459, and the two interlocking plates 452 can be driven to move closer to each other. The two interlocking plates 452 are brought closer to each other to open the gap between the two clamping rings 453. The distance between the acceleration sensor 3 and the clamp ring 453 gradually decreases, thereby reducing the inner diameter of the clamp ring 453 and allowing the rubber pad 454 to clamp one end of the acceleration sensor 3. The material of the rubber pad 454 provides a strong friction force while avoiding damage to the outer side of the acceleration sensor 3. After the rubber pad 454 clamps the acceleration sensor 3, the position of the acceleration sensor 3 remains fixed. When the vibration table 1 generates high-frequency vibration to perform a calibration test on the acceleration sensor 3, the position of the acceleration sensor 3 is prevented from moving. Fixing the acceleration sensor 3 can ensure that the position of the acceleration sensor 3 remains unchanged during the test, thereby eliminating the influence of position changes on the test results and improving the test accuracy. Since the position of the acceleration sensor 3 is fixed, data under different test conditions are easier to compare and analyze, which helps to more accurately evaluate the performance changes of the acceleration sensor 3.

[0048] Step 2: By rotating the gear 459 in the opposite direction, the first rack 457 and the second rack 458 can be driven to move back and forth, so that the distance between the two clamp rings 453 gradually increases, and the rubber pad 454 loosens the fixation on the acceleration sensor 3. At this time, the second reset spring 23 loses pressure and rebounds, so that one end of the acceleration sensor 3 is separated from the inner cavity of the locking groove 11 and returns to its original position. At this time, when the vibration table 1 generates high-frequency vibration to calibrate the acceleration sensor 3, the position of the acceleration sensor 3 can move freely with the vibration, so that the acceleration sensor 3 can simulate the working state in actual application, especially in the occasion where dynamic displacement needs to be detected, to detect the acceleration sensor 3 at different vibration frequencies and The response under displacement can more comprehensively evaluate its performance. When the acceleration sensor 3 is affected by external force, it can automatically move along the reset mechanism 2. When the acceleration sensor 3 moves horizontally, it will drive the mounting frame 212 to move along the inner cavity of the slide rail 211 and squeeze the first reset spring 214 to deform it. When the acceleration sensor 3 moves longitudinally, it will make the slide rail 211 move along the inner wall of the displacement bin 12 and squeeze the second reset spring 23 to deform it. At the same time, when the vibration of the vibration table 1 stops and the test is over, the second reset spring 23 and the first reset spring 214 lose pressure and rebound, so that the moving frame 21 and the mounting frame 212 return to their original positions, and the acceleration sensor 3 returns to its original position.

[0049] Step three, since calibration parts 24 are provided on both sides of the movable frame 21 and the mounting frame 212, and positioning parts 13 are provided on the inner sides of the shifting bin 12 and the slide rail 211, when the movable frame 21 or the mounting frame 212 is reset, since both sides of the outer shell 241 are set as inclined surfaces and both sides of the embedded block 133 are also set as mutually compatible inclined surfaces, when the movable frame 21 or the mounting frame 212 moves to the positioning part 13, the embedded block 133 is pushed backward by the action of the inclined surface, and the first spring 132 is squeezed to deform it, and the embedded block 133 enters the inner cavity of the card embedding seat 243 under the elastic force of the first spring 132, so that the position of the movable frame 21 or the mounting frame 212 is locked, avoiding the position deviation of the acceleration sensor 3 when resetting, and ensuring that the acceleration sensor 3 returns to the initial position after each test, thereby eliminating the influence of position change on the test result and improving the accuracy of the test.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A calibration device for an acceleration sensor, characterized in that: include A vibration table (1), the vibration table (1) being used to simulate a vibration environment to perform calibration tests on an acceleration sensor (3), a plurality of locking grooves (11) being provided on one side of an inner wall of the vibration table (1), and a shifting bin (12) for automatically moving the acceleration sensor (3) being provided at the bottom of an inner cavity of the vibration table (1); A locking mechanism (4), the locking mechanism (4) being arranged on one side of the vibration table (1), the locking mechanism (4) comprising a clamping lock (45), the clamping lock (45) being used to fix the acceleration sensor (3) to prevent it from moving, and the clamping lock (45) being arranged in the inner wall of the locking groove (11), the clamping lock (45) comprising a transmission bin (451), the bottom of the transmission bin (451) being movably connected to two linkage plates (452), a clamping ring (453) being arranged on one side of the linkage plate (452), and the two clamping rings (453) forming an annular lock for locking the acceleration sensor (3); A reset mechanism (2), the reset mechanism (2) being used to reset the position of the acceleration sensor (3) after a calibration test of the acceleration sensor (3) is completed, the reset mechanism (2) being arranged in the inner cavity of the displacement chamber (12); The reset mechanism (2) comprises a movable frame (21), second reset springs (23) are respectively arranged on both sides of the movable frame (21), one end of the second reset spring (23) is connected to a fixed seat (22), the movable frame (21) comprises a slide rail (211), a mounting frame (212) is arranged in the inner cavity of the slide rail (211), the acceleration sensor (3) is mounted on the top of the mounting frame (212), a plurality of baffles (213) are also arranged in the inner cavity of the slide rail (211), and the mounting frame (212) and the baffles (213) are connected via a first reset spring (214); A gear (459) is disposed inside the transmission chamber (451), and a first rack (457) and a second rack (458) are disposed on both sides of the gear (459), the inner sides of the first rack (457) and the second rack (458) are meshed with the outer edge of the gear (459), and the bottoms of the second rack (458) and the gear (459) are fixedly connected to the top ends of the two linkage plates (452); The locking mechanism (4) further comprises a servo motor (41), the output end of the servo motor (41) being provided with a main pulley (42), the outer side of the main pulley (42) being provided with at least two belt strips (43), the inner wall of one end of the belt strip (43) being provided with a secondary pulley (44), the wrap angle between the belt strip (43) and the main pulley (42) and the secondary pulley (44) being greater than 120°, the bottom of the secondary pulley (44) being fixedly connected with a driving shaft (456), the top end of the driving shaft (456) being fixedly connected with a gear (459); Calibration members (24) are provided at both ends of the movable frame (21); slide grooves (121) for the calibration member (24) to slide are provided at both ends of the inner wall of the displacement bin (12); the calibration member (24) comprises a shell (241); a card insertion seat (243) is provided in the inner cavity of the shell (241); a positioning member (13) is provided on the inner wall of the slide groove (121); the positioning member (13) comprises a shell (131); an embedding block (133) is provided in the inner cavity of the shell (131); a first spring (132) is provided on one side of the embedding block (133); Both sides of the shell (241) are arranged at oblique angles, and both sides of the embedding block (133) are also arranged at oblique angles. The inner cavity of the shell (241) is located on one side of the embedding seat (243) and is provided with a second spring (242), and the elastic force of the second spring (242) is greater than the elastic force of the first spring (132).

2. The calibration device for an acceleration sensor according to claim 1, characterized in that: A locking plate (122) is provided at the top of the inner cavity of the slide groove (121), a bolt (123) is provided at the top of the locking plate (122), and mutually matching brake blocks are provided on the contact surfaces of the housing (131) and the locking plate (122).

3. The calibration device for an acceleration sensor according to claim 1, characterized in that: A rubber pad (454) is arranged on the inner side of the clamp ring (453), and a number of anti-sliding blocks are arranged on the inner side of the rubber pad (454).

4. The calibration device for an acceleration sensor according to claim 1, characterized in that: A torsion spring (455) is provided on one side of each of the two linkage plates (452), and one end of the torsion spring (455) is fixedly connected to the inner wall of the locking groove (11).

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