Device for calibrating force sensor

Abstract

The utility model provides a device for calibrating a force sensor, which comprises a frame, a motor, an electro-hydraulic actuator, a calibrated force sensor and a standard force sensor, the electro-hydraulic actuator, the calibrated force sensor and the standard force sensor are fixedly mounted on the frame, the motor is in transmission connection with the electro-hydraulic actuator, and the standard force sensor is in transmission connection with the electro-hydraulic actuator. The electro-hydraulic actuator can output force in the horizontal direction, and the calibrated force sensor and the standard force sensor are arranged at the output end of the electro-hydraulic actuator and used for measuring push-pull force generated by the electro-hydraulic actuator. According to the utility model, the motor controls the electro-hydraulic actuator to generate push-pull force according to requirements, the push-pull force is applied to the calibrated sensor and the standard sensor, the reading accuracy of the calibrated force sensor is judged by comparing the numerical value deviation of the standard force sensor and the calibrated force sensor, the installation is simple and convenient, the reading is visual, and the requirement on the field is not too much. Field calibration can be realized, and the problems of long metering calibration period, complex operation flow and the like can be effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of sensor calibration technology, and more specifically, to a device for calibrating a force sensor. Background Technology

[0002] A force sensor is a device that converts the magnitude of force into a corresponding electrical signal. Force is the direct cause of changes in the motion of matter. Force sensors can detect mechanical quantities such as tension, strain, pressure, weight, torque, internal stress, and strain. Specific devices include metal strain gauges and pressure sensors, and they have become indispensable core components in power equipment, construction machinery, various machine tools, and industrial automation systems. To ensure the accuracy of force sensors, they must be calibrated regularly.

[0003] A Chinese patent with publication number CN212721902U discloses a force sensor calibration fixture. The force sensor being calibrated is the test piece. The fixture differs in that it includes a fixed frame, a standard component for a high-precision force sensor, a central connecting rod, and a tension / compression device. The fixed frame includes a lower base plate, a support column, and upper fixing plates fixed to the upper sides of the lower base plate via the support column. The upper fixing plates have an adjustment hole with internal threads that runs vertically through the upper and lower parts. The upper end of the central connecting rod is detachably connected to the test piece, and the lower end is detachably connected to the standard component. The tension / compression device includes an upper part and a lower part. The upper end of the lower part is detachably connected to the standard component, and the lower end is detachably connected to the lower base plate. The upper end of the upper part has an adjustment rod with external threads that mates with the upper adjustment hole, and the lower end is detachably connected to the test piece. By rotating the adjustment rod, the standard component and the test piece are simultaneously subjected to the same force.

[0004] Traditional force sensor calibration typically uses physical measurement standards such as weights for calibration, which are heavy, bulky, have certain requirements for the operating environment, and are inconvenient to carry.

[0005] Traditional valve-controlled hydraulic systems require hydraulic pump stations, large hydraulic oil tanks, and piping systems for calibrating force sensors. The throttling losses caused by valve control lead to system heat generation, necessitating a dedicated cooling system.

[0006] Electric cylinder calibration equipment has certain site requirements and cannot be calibrated on-site, especially for high-order force sensors, where electric equipment is prone to jamming malfunctions.

[0007] Therefore, the inventors believe there is a need to provide a device for calibrating force sensors that is easy to install, provides intuitive readings, does not require much space, and can be calibrated on-site, effectively solving the problems of long calibration cycles, complex operation procedures, and inconvenient weights to carry. Utility Model Content

[0008] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a device for calibrating force sensors.

[0009] A device for calibrating a force sensor according to the present invention includes: a frame, a motor, an electro-hydraulic actuator, a force sensor to be calibrated, and a standard force sensor. The electro-hydraulic actuator, the force sensor to be calibrated, and the standard force sensor are fastened to the frame. The motor is drivenly connected to the electro-hydraulic actuator. The electro-hydraulic actuator is capable of outputting a force in the horizontal direction. The force sensor to be calibrated and the standard force sensor are disposed at the output end of the electro-hydraulic actuator and are used to measure the push-pull force generated by the electro-hydraulic actuator.

[0010] Preferably, the electro-hydraulic actuator is horizontally positioned, and the motor is mounted on the upper center of the electro-hydraulic actuator.

[0011] Preferably, the force sensor being calibrated and the standard force sensor are fitted together.

[0012] Preferably, one end of the force sensor to be calibrated is fixedly mounted on the output end face of the electro-hydraulic actuator, the other end of the force sensor to be calibrated is fixedly connected to one end of the standard force sensor, and the other end of the standard force sensor is fixedly mounted on the frame.

[0013] Preferably, one end of the standard force sensor is fixedly mounted on the output end face of the electro-hydraulic actuator, the other end of the standard force sensor is fixedly connected to one end of the force sensor to be calibrated, and the other end of the force sensor to be calibrated is fixedly mounted on the frame.

[0014] Preferably, the force sensor being calibrated and the standard force sensor are fastened together by a connector.

[0015] Preferably, the force sensor to be calibrated or the standard force sensor is fastened to the output end of the electro-hydraulic actuator via a connector, and the force sensor to be calibrated or the standard force sensor is fastened to the frame via a connector.

[0016] Preferably, the accuracy of the standard force sensor is not less than the accuracy of the force sensor being calibrated.

[0017] Preferably, the frame includes multiple connecting plates and connecting rods, and the electro-hydraulic actuator is detachably installed inside the frame. The front and rear ends of the electro-hydraulic actuator are respectively fastened to the frame by fixing pins.

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

[0019] 1. This utility model uses a motor-controlled electro-hydraulic actuator to generate push and pull forces as required, which are applied to the calibrated sensor and the standard sensor. The accuracy of the reading of the calibrated force sensor is judged by comparing the numerical deviation between the standard force sensor and the calibrated force sensor. It is easy to install, provides intuitive readings, does not have many requirements for the site, and can achieve on-site calibration. It can effectively solve the problems of long calibration cycles, complex operation procedures, and inconvenient weights.

[0020] 2. This utility model effectively solves the problem of difficulty in stably fixing electro-hydraulic actuators, especially heavy and bulky single electro-hydraulic actuators, in the vertical direction when they are placed vertically, by using a fixing device to lay the electro-hydraulic actuator flat and then quickly measuring and calibrating the push-pull force. It also overcomes the difficulty in accurately measuring the push-pull force in this direction. The electro-hydraulic actuator is small in size, lightweight, and has its own oil supply system. Its accuracy depends on the accuracy of the standard force sensor. Theoretically, there is no upper limit to the range of the electro-hydraulic actuator. The design can be changed according to the actual situation, and it is suitable for calibrating various types of sensors. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the device for calibrating the force sensor, which is the main feature of this utility model.

[0023] As shown in the figure:

[0024] Frame 1, Motor 2, Fixing pin 3

[0025] 4 Electro-hydraulic actuator; 5 Force sensor to be calibrated; 6 Standard force sensor Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0027] like Figure 1As shown, a device for calibrating a force sensor according to the present invention includes: a frame 1, a motor 2, an electro-hydraulic actuator 4, a force sensor to be calibrated 5, and a standard force sensor 6. The electro-hydraulic actuator 4, the force sensor to be calibrated 5, and the standard force sensor 6 are fastened to the frame 1. The motor 2 is connected to the electro-hydraulic actuator 4 for transmission. The electro-hydraulic actuator 4 can output a force in the horizontal direction. The force sensor to be calibrated 5 and the standard force sensor 6 are disposed at the output end of the electro-hydraulic actuator 4 and are used to measure the push-pull force generated by the electro-hydraulic actuator 4.

[0028] The electro-hydraulic actuator 4 is horizontally positioned, with the motor 2 mounted above and in the center of the actuator 4. The electro-hydraulic actuator 4 controls the speed and direction of the hydraulic cylinder piston rod by controlling the rotational speed and direction of the motor 2, thus converting electrical energy into mechanical energy. Based on the direct-drive pump control principle, the electro-hydraulic actuator 4 adopts a modular, integrated design, combining the advantages of high power density in hydraulic systems and simple control in electric systems. Compared to traditional valve-controlled hydraulic systems and electric drive systems, it features high system efficiency, high reliability, and low maintenance costs.

[0029] The accuracy of the standard force sensor 6 is no less than that of the force sensor 5 being calibrated. The force sensor 5 and the standard force sensor 6 are fitted together and also fitted to the output end face of the electro-hydraulic actuator 4. Because the three are tightly fitted, coaxiality is not required, allowing for accurate measurement of the unknown magnitude of the push-pull force generated by the force sensor 5 and the standard force sensor 6 on the electro-hydraulic actuator 4. Therefore, the positions of the force sensor 5 and the standard force sensor 6 can be interchanged. One end of the force sensor 5 is fixedly mounted on the output end face of the electro-hydraulic actuator 4, and the other end of the force sensor 5 is fixedly connected to one end of the standard force sensor 6, which is then fixedly mounted on the frame 1. Alternatively, one end of the standard force sensor 6 is fixedly mounted on the output end face of the electro-hydraulic actuator 4, and the other end of the standard force sensor 6 is fixedly connected to one end of the force sensor 5, which is then fixedly mounted on the frame 1.

[0030] The connection between the force sensor 5 to be calibrated, the standard force sensor 6, and the electro-hydraulic actuator 4 only needs to be secure and not cause deformation that would affect the measurement. In other specific embodiments, the force sensor 5 to be calibrated and the standard force sensor 6 can also be fastened together using a connector. The force sensor 5 to be calibrated or the standard force sensor 6 is fastened to the output end of the electro-hydraulic actuator 4 via a connector, and the force sensor 5 to be calibrated or the standard force sensor 6 is fastened to the frame 1 via a connector.

[0031] In practical applications, different sensors are fixed in different ways. The appropriate connection method should be selected based on the actual situation. Since different types of sensors vary in length and size, frame 1 is preferably an adjustable-length frame. Frame 1 includes multiple connecting plates and connecting rods. The electro-hydraulic actuator 4 is detachably installed inside frame 1. The front and rear ends of the electro-hydraulic actuator 4 are respectively fastened to frame 1 by fixing pins 3, i.e., the fixing pins 3 pass vertically through the electro-hydraulic actuator 4 and connect to the connecting rods or connecting plates on the side of frame 1.

[0032] This application effectively solves the problem of unstable vertical fixation of vertically placed electro-hydraulic actuators, especially heavy and bulky single actuators, by using a fixing device to lay the electro-hydraulic actuator 4 flat, thereby enabling rapid measurement and calibration of push-pull forces. It also overcomes the difficulty of accurately measuring push-pull forces in this direction. Furthermore, the electro-hydraulic actuator 4 is small in size, lightweight, and has its own oil supply system. Its accuracy depends on the accuracy of the standard force sensor 6. Theoretically, the measuring range of the electro-hydraulic actuator 4 has no upper limit, and the design can be modified according to actual conditions. Therefore, the electro-hydraulic actuator 4 is suitable for calibrating various types of sensors.

[0033] This application facilitates on-site calibration of the force sensor 5, and can be quickly assembled into a complete measurement and calibration platform, effectively solving the problems of long calibration cycles, complex operation procedures, and inconvenient weights.

[0034] The method of operating the calibration force sensor device of this application includes the following steps:

[0035] Step S1: Fix and stabilize frame 1;

[0036] Step S2: Fix the electro-hydraulic actuator 4 onto the frame 1;

[0037] Step S3: Fix the force sensor 5 to be calibrated, the standard force sensor 6, and the frame 1.

[0038] In step S4, the electro-hydraulic actuator 4, controlled by the motor 2, generates a push-pull force applied to the calibrated force sensor 5 and the standard force sensor 6.

[0039] Step S5: Using the reading of the standard sensor 6 as a standard, determine whether the calibrated sensor 5 is within the qualified range by comparing the values.

[0040] This application controls the rotational speed of motor 2 to enable electro-hydraulic actuator 4 to generate push-pull force as required, which is applied to the calibrated sensor 5 and standard sensor 6. The accuracy of the calibrated force sensor's reading is determined by comparing the numerical deviations between the standard force sensor 6 and the calibrated force sensor 5. This measurement method is simple to install, provides intuitive readings, has minimal site requirements, and can achieve on-site calibration.

[0041] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A device for calibrating a force sensor, characterized in that, include: The frame (1), motor (2), electro-hydraulic actuator (4), calibrated force sensor (5), and standard force sensor (6) are provided. One end of the electro-hydraulic actuator (4) is fixedly mounted on the frame (1). The motor (2) is connected to the electro-hydraulic actuator (4) in a transmission manner. The electro-hydraulic actuator (4) can output a force in the horizontal direction. The calibrated force sensor (5) and the standard force sensor (6) are used to measure the push and pull force generated by the electro-hydraulic actuator (4). The accuracy of the standard force sensor (6) is not less than the accuracy of the calibrated force sensor (5). The calibrated force sensor (5) and the standard force sensor (6) are fitted together. When the calibrated force sensor (5) and the electro-hydraulic actuator (4) are fitted together, the standard force sensor (6) is securely mounted on the frame (1); When the standard force sensor (6) and the electro-hydraulic actuator (4) are fitted together, the calibrated force sensor (5) is fixedly mounted on the frame (1).

2. The apparatus for calibrating a force sensor as described in claim 1, characterized in that, The electro-hydraulic actuator (4) is set horizontally, and the motor (2) is installed in the upper middle part of the electro-hydraulic actuator (4).

3. The apparatus for calibrating a force sensor as described in claim 1, characterized in that, The frame (1) includes multiple connecting plates and connecting rods. The electro-hydraulic actuator (4) is detachably installed inside the frame (1). The front and rear ends of the electro-hydraulic actuator (4) are respectively fastened to the frame (1) by fixing pins (3).

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