Portable force transducer calibration system and method

Abstract

The invention belongs to the technical field of sensor calibration, and discloses a portable force transducer calibration system and method.The portable force transducer calibration system comprises a controller, a calibration device and a portable box, and the controller and the calibration device are integrated in the portable box; the controller is used for controlling the calibration device and recording, analyzing and processing calibration data, the calibration device comprises a hydraulic cylinder, a mounting plate is fixedly mounted at the bottom end of the hydraulic cylinder, a standard load sensor is fixedly mounted at the bottom of the mounting plate, and the standard load sensor is in electric smelting connection with the controller. According to the scheme, higher-precision calibration is achieved through the high-precision load sensor, the magnitude of the loading force is controlled through the hydraulic cylinder, the magnitude of the force can be accurately and automatically controlled, an operator is more convenient to use, the calibration device and the control system are integrated in the portable box, storage and carrying are convenient, the requirement for mobile use is met, and the practicability is high. And the use flexibility and convenience of the force transducer calibration system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor calibration, and more specifically, to a portable calibration system and method for a force sensor. Background Art

[0002] Calibration refers to using a standard measuring instrument to detect whether the accuracy (precision) of the instrument being used meets the standard, which is generally used for instruments with high precision. When manufacturing a force sensor or when there is a large force measurement error, it is necessary to calibrate the force sensor through a calibration system.

[0003] The usual method for calibrating a force sensor is to directly place a standard weight on the force sensor. The sensor senses the longitudinal pressure exerted by the weight and generates a pressure signal that is output to a signal conditioner. Through a data collector or pressure gauge, the measured value of the sensor corresponding to the standard weight is output, and thus the calibration error is calculated. This method has a simple principle and is feasible. However, due to the limited number of standard weights and the discontinuous force values of the weights, only a limited number of discrete force values can be calibrated, and continuous force values within the range cannot be calibrated. Moreover, it is necessary to manually add and subtract weights, which is inconvenient to operate, time-consuming and laborious, and not convenient for mobile use, reducing the flexibility of the force sensor calibration system. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a portable calibration system and method for a force sensor.

[0005] To solve the above problems, the present invention adopts the following technical solutions: A portable calibration system for a force sensor includes a controller, a calibration device, and a portable case. The controller and the calibration device are integrated in the portable case. The controller is used to control the calibration device and record, analyze, and process calibration data. The calibration device includes a hydraulic cylinder. The bottom end of the hydraulic cylinder is fixedly installed with a mounting plate. The bottom of the mounting plate is fixedly installed with a standard load sensor. The standard load sensor is electrically connected to the controller, and the bottom of the standard load sensor is fixedly installed with a pressure block. The portable case includes a lower base and an upper box body. The controller is arranged on the lower base. The calibration device is fixedly installed on the inner top wall of the upper box body. A calibration area corresponding to the calibration device is arranged on the lower base, and a lifting mechanism for driving the upper box body to lift is arranged on the lower base.

[0006] As a further description of the above technical solution: The controller includes a host, a data acquisition module, a data processing module, a display screen, and a control module. The data acquisition module, the data processing module, the display screen, and the control module are respectively electrically connected to the host.

[0007] As a further description of the above technical solution: The lifting mechanism includes four threaded rods rotatably arranged at the four corners of the lower base. Threaded grooves are provided at the four corners of the bottom of the upper box body corresponding to the four threaded rods. The threaded rods are threadedly connected to the threaded grooves. A cavity is provided inside the lower base. A driving component is arranged in the cavity. The driving component drives the four threaded rods to rotate synchronously. A storage battery is arranged in the cavity.

[0008] As a further description of the above technical solution: The driving component includes a driving motor, a transmission belt, and belt pulleys fixedly connected to the four threaded rods and the output shaft of the driving motor. The five belt pulleys are driven by the transmission belt.

[0009] As a further description of the above technical solution: A groove is provided at the top of the lower base. The controller is recessed and installed in the groove. The calibration area is located in the groove and on one side of the controller.

[0010] As a further description of the above technical solution: A leveling foot pad is provided at each of the four corners of the bottom of the lower base. A spirit level is provided on the lower base.

[0011] As a further description of the above technical solution: The bottom surface of the pressure block is flat and smooth and is provided with a layer of soft film.

[0012] As a further description of the above technical solution: A visual window is provided on the upper box body corresponding to the calibration device. A handle is provided at the top of the upper box body.

[0013] A portable calibration method for a force sensor includes the following steps: S1. Preparation before calibration: Use the leveling foot pads to make the portable box in a horizontal state. Separate the upper box body from the lower base through the lifting mechanism and make the upper box body in the highest state; Ensure that the controller and the calibration device are in a normal working state, connect the power supply and calibrate the corresponding parameters; S2. Set calibration parameters: According to the specifications and requirements of the force sensor to be measured, set the calibration parameters in the controller, including the measurement range and the number of calibration points information, and place the force sensor to be measured in the calibration area and correspond it to the pressure block; S3. Apply calibration load: Drive the pressure block to press down through the hydraulic cylinder to test the force sensor; S4. Data monitoring: Real-time monitor and record the signals output by the force sensor and the standard load sensor through the controller, and display the corresponding load values through the display screen; S5. Analyze data: Compare and analyze according to the measured value of the force sensor and the value of the standard load sensor, calculate the error deviation of the force sensor, and adjust the gain and zero point parameters of the sensor; S6. Calibrate the force measuring sensor: Calibrate the force measuring sensor according to the analysis result to make its output value consistent with the standard value; S7. Verify the calibration result: Reapply the standard load for verification to confirm the accuracy and stability of the force measuring sensor after calibration.

[0014] Compared with the prior art, the advantages of the present invention are as follows: This solution realizes higher-precision calibration through a high-precision load sensor, and controls the magnitude of the loading force through a hydraulic cylinder, which can accurately and automatically control the magnitude of the force, making it more convenient for the operator. Moreover, the calibration device and the control system are integrated in a portable box, which is convenient for storage and carrying, meets the needs of mobile use, and improves the flexibility and convenience of use of the force measuring sensor calibration system. Brief Description of the Drawings

[0015] Figure 1 is one of the structural schematic diagrams of the present invention; Figure 2 is the second structural schematic diagram of the present invention; Figure 3 is the system diagram of the present invention; Figure 4 is the structural schematic diagram of the calibration device of the present invention.

[0016] Explanation of the reference numerals in the drawings: 1. Controller; 11. Host; 12. Data acquisition module; 13. Data processing module; 14. Display screen; 15. Control module; 2. Calibration device; 21. Hydraulic cylinder; 22. Mounting plate; 23. Standard load sensor; 24. Pressure block; 3. Portable box; 31. Lower base; 32. Upper box body; 33. Calibration area; 34. Lifting mechanism; 341. Threaded rod; 342. Thread groove; 343. Driving component; 3431. Driving motor; 3432. Transmission belt; 3433. Pulley; 35. Battery; 35. Visual window; 36. Handle; 4. Leveling foot pads; 5. Level gauge. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1 Please refer to Figures 1-3, A portable calibration system for a force sensor, comprising a controller 1, a calibration device 2 and a portable case 3. The controller 1 and the calibration device 2 are integrated within the portable case 3; The controller 1 is used to control the calibration device 2 and record, analyze and process calibration data. The controller 1 includes a main unit 11, a data acquisition module 12, a data processing module 13, a display screen 14 and a control module 15. The data acquisition module 12, the data processing module 13, the display screen 14 and the control module 15 are electrically connected to the main unit 11 respectively.

[0019] The calibration device 2 includes a hydraulic cylinder 21. A mounting plate 22 is fixedly installed at the bottom end of the hydraulic cylinder 21. A standard load sensor 23 is fixedly installed at the bottom of the mounting plate 22. The standard load sensor 23 is electrically connected to the controller 1. A pressure block 24 is fixedly installed at the bottom of the standard load sensor 23. The bottom surface of the pressure block 24 is flat and smooth and is provided with a layer of soft film to achieve an anti-slip effect.

[0020] Embodiment 2 Please refer to Figure 2 、 4 , This embodiment is a further improvement based on Embodiment 1. Compared with Embodiment 1, the specific composition structure of the portable case 3 is disclosed: The portable case 3 includes a lower base 31 and an upper box body 32. The controller 1 is arranged on the lower base 31. The calibration device 2 is fixedly installed on the inner top wall of the upper box body 32. A calibration area 33 corresponding to the calibration device 2 is arranged on the lower base 31. A lifting mechanism 34 for driving the upper box body 32 to lift is arranged on the lower base 31.

[0021] Among them, the lifting mechanism 34 includes four threaded rods 341 rotatably arranged at the four corners of the lower base 31. Threaded grooves 342 are opened at the four corners of the bottom of the upper box body 32 corresponding to the four threaded rods 341. The threaded rods 341 are threadedly connected to the threaded grooves 342. A cavity is arranged inside the lower base 31. A driving assembly 343 is arranged in the cavity. The driving assembly 343 drives the four threaded rods 341 to rotate synchronously. A storage battery 345 is arranged in the cavity. The driving assembly 343 includes a driving motor 3431, a transmission belt 3432, and belt pulleys 3433 fixedly connected to the four threaded rods 341 and the output shaft of the driving motor 3431. The five belt pulleys 3433 are driven by the transmission belt 3432.

[0022] In this embodiment, by arranging the lifting mechanism 34, when the calibration device 2 needs to be used, only by driving the driving motor 3431 and cooperating with the transmission of the belt pulleys 3433 and the transmission belt 3432, the four threaded rods 341 can be rotated synchronously, so that the upper box body 32 rises and separates from the lower base 31, exposing the controller 1 and the calibration area, thus facilitating the calibration of the force sensor; When it is not needed, the upper box body 32 is reset by lifting 34, thereby realizing the storage of the calibration device 2 and reducing the overall volume of the entire box body, which is convenient for carrying and transporting.

[0023] Furthermore: A groove is provided at the top of the lower base 31, and the controller 1 is recessed and installed in the groove. The calibration area 33 is located in the groove and on one side of the controller 1. The upper box body 32 is provided with a visual window 35 corresponding to the calibration device 2, which is beneficial to observing the test situation of the calibration device 2 inside the upper box body 32 through the visual window 35. A handle 36 is provided at the top of the upper box body 32, which is convenient for carrying and transporting the entire box body. One leveling foot pad 4 is provided at each of the four corners of the bottom of the lower base 31, and a level gauge 5 is provided on the lower base 31. The cooperation of the leveling foot pads 4 and the level gauge 5 can control the stability and level of the overall device to ensure the accuracy of calibration.

[0024] Based on the above embodiments, the calibration method of the force sensor of the present device includes the following steps: S1. Preparation before calibration: Make the portable box 3 in a horizontal state through the leveling foot pads 4, separate the upper box body 32 from the lower base 31 through the lifting mechanism 34 and make the upper box body 32 in the highest state; Ensure that the controller 1 and the calibration device 2 are in a normal working state, connect the power supply and calibrate the corresponding parameters; S2. Set calibration parameters: According to the specifications and requirements of the force sensor to be measured, set calibration parameters in the controller 1, including the measurement range and the number of calibration points information, and place the force sensor to be measured in the calibration area 33 and correspond to the pressure block 24; S3. Apply calibration load: Drive the pressure block 24 to press down through the hydraulic cylinder 21 to test the force sensor; S4. Data monitoring: Real-time monitor and record the signals output by the force sensor and the standard load sensor 23 through the controller 1, and display the corresponding load values through the display screen 14; S5. Analyze data: Compare and analyze according to the measured value of the force sensor and the value of the standard load sensor 23, calculate the error deviation of the force sensor, and adjust the gain and zero point parameters of the sensor; S6. Calibrate the force sensor: Calibrate the force sensor according to the analysis results to make its output value consistent with the standard value; S7. Verify the calibration result: Reapply the standard load for verification to confirm the accuracy and stability of the force sensor after calibration.

[0025] The above are only the preferred specific embodiments of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, making equivalent substitutions or changes according to the technical solution of the present invention and its improved conceptions, shall be covered by the protection scope of the present invention.

Claims

1. A portable calibration system for a force sensor, characterized in that: It includes a controller (1), a calibration device (2) and a portable case (3), and the controller (1) and the calibration device (2) are integrated in the portable case (3); The controller (1) is used to control the calibration device (2) and record and analyze the calibration data; The calibration device (2) includes a hydraulic cylinder (21). An installation plate (22) is fixedly installed at the bottom end of the hydraulic cylinder (21). A standard load sensor (23) is fixedly installed at the bottom of the installation plate (22). The standard load sensor (23) is electrically connected to the controller (1). A pressure block (24) is fixedly installed at the bottom of the standard load sensor (23); The portable case (3) includes a lower base (31) and an upper box body (32). The controller (1) is arranged on the lower base (31). The calibration device (2) is fixedly installed on the inner top wall of the upper box body (32). A calibration area (33) corresponding to the calibration device (2) is arranged on the lower base (31). A lifting mechanism (34) for driving the upper box body (32) to lift is arranged on the lower base (31).

2. The portable force sensor calibration system according to claim 1, wherein: The controller (1) includes a main unit (11), a data acquisition module (12), a data processing module (13), a display screen (14) and a control module (15). The data acquisition module (12), the data processing module (13), the display screen (14) and the control module (15) are respectively electrically connected to the main unit (11).

3. A portable calibration system for a force sensor according to claim 1, characterized in that: The lifting mechanism (34) includes four threaded rods (341) rotatably arranged at the four corners of the lower base (31). Threaded grooves (342) corresponding to the four threaded rods (341) are formed at the four corners of the bottom of the upper box body (32). The threaded rods (341) are in threaded connection with the threaded grooves (342). A cavity is arranged inside the lower base (31). A driving component (343) is arranged in the cavity. The driving component (343) drives the four threaded rods (341) to rotate synchronously. A storage battery (345) is arranged in the cavity.

4. A portable calibration system for a force sensor according to claim 3, characterized in that: The driving component (343) includes a driving motor (3431), a transmission belt (3432), and belt pulleys (3433) fixedly connected to the four threaded rods (341) and the output shaft of the driving motor (3431). The five belt pulleys (3433) are driven by the transmission belt (3432).

5. A portable calibration system for a force sensor according to claim 1, characterized in that: A groove is formed at the top of the lower base (31). The controller (1) is recessedly installed in the groove. The calibration area (33) is located in the groove and on one side of the controller (1).

6. The portable calibration system for a force sensor according to claim 1, wherein: A leveling foot pad (4) is arranged at each of the four corners at the bottom of the lower base (31). A level gauge (5) is arranged on the lower base (31).

7. A portable calibration system for a force sensor according to claim 1, characterized in that: The bottom surface of the pressure block (24) is flat and smooth and is provided with a layer of soft film.

8. A portable calibration system for a force sensor according to claim 1, characterized in that: A visible window (35) corresponding to the calibration device (2) is arranged on the upper box body (32). A handle (36) is arranged at the top of the upper box body (32).

9. A portable calibration method for a force sensor according to any one of claims 1-8, characterized in that: It includes the following steps: S1. Preparation before calibration: Make the portable case (3) in a horizontal state through the leveling foot pads (4), and separate the upper box body (32) from the lower base (31) through the lifting mechanism (34) to make the upper box body (32) in the highest state; Ensure that the controller (1) and the calibration device (2) are in a normal working state, connect the power supply and calibrate the corresponding parameters; S2. Set calibration parameters: According to the specifications and requirements of the force sensor to be measured, set calibration parameters in the controller (1), including the measurement range and the number of calibration points information, and place the force sensor to be measured in the calibration area (33) and correspond it to the pressure block (24); S3. Apply calibration load: Drive the pressure block (24) to press down through the hydraulic cylinder (21) to test the force sensor; S4. Data monitoring: Real-time monitor and record the signals output by the force sensor and the standard load sensor (23) through the controller (1), and display the corresponding load values through the display screen (14); S5. Analyze data: Compare and analyze according to the measured value of the force sensor and the value of the standard load sensor (23), calculate the error deviation of the force sensor, and adjust the gain and zero point parameters of the sensor; S6. Calibrate the force sensor: Calibrate the force sensor according to the analysis results to make its output value consistent with the standard value; S7. Verify the calibration result: Reapply the standard load for verification to confirm the accuracy and stability of the force sensor after calibration.

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