Torque measuring device and measuring system

Abstract

The utility model relates to a torque measuring device and a measuring system, wherein the torque measuring device comprises a motor, a force arm, a support and a weighing sensor, and the tail end of an output shaft of the motor is connected with a universal joint; the force arm is connected with a shell of the motor; a plane bearing is arranged on the support, an output shaft of the motor penetrates through the plane bearing and is connected with a first rotating surface of the plane bearing, and a second rotating surface of the plane bearing is connected with the support; the motor is arranged on the support, the weighing sensor is arranged on the support, the force arm is connected with the weighing sensor, and when the motor operates, reaction torque generated by a shell of the motor acts on the weighing sensor through the force arm. Compared with the prior art, the torque measuring device not only simplifies the torque measuring process, but also improves the measuring accuracy and reliability, so that the torque measuring device can be used for stable testing work under extreme conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to torque measurement technical field especially is related to a torque measuring device and measuring system. BACKGROUND

[0002] The background technology of the utility model relates to the traditional torque measurement method, which usually relies on direct contact with the measured object to realize the measurement of torque. In the conventional working environment, these sensors can provide sufficient measurement accuracy and stability to meet the basic needs of industrial applications. However, when the working environment becomes extreme, such as in high and low temperature, high pressure or oil sealed conditions, the limitations of these traditional sensors become particularly evident.

[0003] In particular, in the oil sealed torque test, the traditional sensor not only has poor reliability, but also has high cost. The oil sealed environment puts higher requirements on the oil resistance, sealing performance and long-term stability of the sensor, and the performance of the traditional sensor in these aspects is often unsatisfactory, which not only limits its use in specific industrial applications, but also increases the cost of maintenance and replacement.

[0004] Therefore, it is particularly important to develop a torque measuring device that can work stably under these extreme conditions, measure accurately and have high cost-effectiveness. UTILITY MODEL CONTENT

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a torque measuring device and measuring system. This design not only simplifies the torque measurement process, but also improves the accuracy and reliability of the measurement, so that the device can be used for stable testing work in extreme conditions.

[0006] The purpose of the utility model can be achieved by the following technical solutions:

[0007] In the utility model, a torque measuring device is provided, which comprises a motor, a force arm, a support and a weighing sensor, wherein specifically:

[0008] The motor is connected with a universal joint at the end of its output shaft;

[0009] The force arm is connected with the shell of the motor;

[0010] The support is provided with a plain bearing, the output shaft of the motor penetrates through the plain bearing and is connected with the first rotating surface of the plain bearing, and the second rotating surface of the plain bearing is connected with the support;

[0011] A weighing sensor is arranged on the bracket, and the force arm is connected with the weighing sensor; when the motor is running, the counter-torque generated by the shell of the motor acts on the weighing sensor through the force arm.

[0012] Further, the motor is a servo motor.

[0013] Further, the bracket comprises a horizontal support plate.

[0014] Further, the output shaft of the motor is perpendicular to the horizontal support plate.

[0015] Further, the horizontal support plate is provided with a mounting hole, and the second rotating surface of the plane bearing is fixedly connected with the edge of the mounting hole.

[0016] Further, the output shaft of the motor penetrates the bearing hole of the plane bearing and is connected with the first rotating surface of the plane bearing.

[0017] Under extreme temperature conditions, the traditional torque sensor may not be accurate due to the thermal expansion and contraction of the material, and even may be damaged due to insufficient tolerance. In addition, in a high-pressure environment, the structural strength and sealing performance of the sensor become key factors, and the traditional design often fails to meet these requirements, resulting in increased instability of the measurement results.

[0018] Therefore, the second aspect of the utility model provides a torque measurement system, comprising the torque measurement device as described above, and further comprising: a component to be tested fixing seat, a counter sensor, and a computer terminal, wherein specifically:

[0019] The component to be tested fixing seat is used for fixing the component to be tested, and the component to be tested is connected with the universal joint.

[0020] The counter sensor is arranged on the bracket and is used for acquiring the rotating speed of the output shaft of the motor.

[0021] The computer terminal is in communication connection with the motor, the weighing sensor, and the counter sensor respectively.

[0022] Further, the component to be tested fixing seat is provided with a liquid nitrogen injection cavity, the liquid nitrogen injection cavity is used for cooling the component to be tested fixing seat by liquid nitrogen, so as to realize the test of the component to be tested in a low-temperature environment, and a low-temperature thermocouple is arranged on the component to be tested fixing seat and is in communication connection with the computer terminal.

[0023] Further, the component to be tested comprises a component to be tested fixing part matched with the inner wall of the component to be tested fixing seat and a component to be tested rotating part sleeved in the component to be tested fixing part, and the component to be tested rotating part is connected with the universal joint.

[0024] The gap cavity is filled with low-friction sealing oil.

[0025] Further, the torque measurement system also includes a pressure-resistant cover that can seal the torque measurement device, the component-to-be-tested fixing seat, the counter sensor, and the component-to-be-tested, thereby forming a pressure test environment.

[0026] Compared with the prior art, the present application has the following technical advantages:

[0027] The present application combines a motor to be tested, a universal joint, a force arm, a support, and a weighing sensor to realize a system capable of directly measuring the counter-torque generated by the output shaft of the motor. This design not only simplifies the torque measurement process but also improves the accuracy and reliability of the measurement. In particular, the device transmits the counter-torque generated by the motor housing to the weighing sensor through the force arm, making the measurement result more stable and accurate, which is particularly important for application scenarios that require accurate torque data, such as in precision machinery manufacturing and quality control processes, to ensure the consistency of product quality and performance. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Figure 1 is a structural diagram of the torque measurement system in the present application.

[0029] In the figure: 1, motor, 2, force arm, 3, support, 4, weighing sensor, 5, universal joint, 6, counter sensor, 7, liquid nitrogen injection cavity, 8, low-temperature thermocouple, 9, component-to-be-tested fixing part, 10, component-to-be-tested rotating part. DETAILED DESCRIPTION

[0030] The torque measurement device of the present application solves many problems of traditional sensors in extreme environments through innovative design, providing a low-cost, high-precision, and highly adaptable torque measurement solution. The device is not only suitable for conventional torque measurement but also particularly suitable for oil-sealed torque testing and other scenarios with extremely high equipment requirements, having a wide range of application prospects and market value.

[0031] The present application will be described in detail below in conjunction with the drawings and specific embodiments. In this technical solution, components, material names, connection structures, control methods, algorithms, and other features not explicitly described are considered as common technical features disclosed in the prior art.

[0032] Example 1

[0033] The torque measurement device in the present application includes a motor 1, a force arm 2, a support 3, and a weighing sensor 4, wherein the specific reference is made to Figure 1The output shaft end of the motor 1 is connected with a universal joint 5; the force arm 2 is connected with the shell of the motor 1; the support 3 is provided with a plane bearing, the output shaft of the motor 1 penetrates through the plane bearing and is connected with the first rotating surface of the plane bearing, and the second rotating surface of the plane bearing is connected with the support 3.

[0034] The weighing sensor 4 is arranged on the support 3, and the force arm 2 is connected with the weighing sensor 4; when the motor 1 operates, the counter-torque generated by the shell of the motor 1 acts on the weighing sensor 4 through the force arm 2.

[0035] In the specific test, the motor 1 to be tested is a servo motor.

[0036] The support 3 includes a horizontal support plate. The output shaft of the motor 1 is perpendicular to the horizontal support plate. The horizontal support plate is provided with a mounting hole, and the second rotating surface of the plane bearing is fixedly connected with the edge of the mounting hole. The output shaft of the motor 1 penetrates through the bearing hole of the plane bearing and is connected with the first rotating surface of the plane bearing.

[0037] The device transmits the counter-torque generated by the shell of the motor to the weighing sensor through the force arm, so that the measurement result is more stable and accurate, which is particularly important for application scenarios requiring accurate torque data, such as in precision mechanical manufacturing and quality control processes, to ensure the consistency of product quality and performance.

[0038] The torque measurement system in the embodiment includes the torque measurement device as described above, and further includes a component to be tested fixing seat, a counter sensor 6, and a computer terminal. The component to be tested fixing seat is used for fixing a component to be tested, and the component to be tested is connected with the universal joint 5. The counter sensor 6 is arranged on the support 3 and is used for acquiring the rotating speed of the output shaft of the motor 1. The computer terminal is in communication connection with the motor 1, the weighing sensor 4, and the counter sensor 6 respectively.

[0039] The component to be tested fixing seat 5 is provided with a liquid nitrogen injection cavity 7, which is used for cooling the component to be tested fixing seat 5 by liquid nitrogen, so as to realize the test environment of placing the component to be tested in a low-temperature environment. The component to be tested fixing seat 5 is provided with a low-temperature thermocouple 8, which is in communication connection with the computer terminal.

[0040] The component to be tested includes a component to be tested fixing part 9 matchedly connected with the inner wall of the component to be tested fixing seat and a component to be tested rotating part 10 sleeved in the component to be tested fixing part 9, and the component to be tested rotating part 10 is connected with the universal joint 5.

[0041] A gap cavity is provided between the component under test fixing part 9 and the component under test rotating part 10, and low-friction sealing oil can be filled in the gap cavity. The torque measurement system further comprises a pressure-resistant cover, which can seal the torque measurement device, the component under test fixing seat, the counter sensor 6, and the component under test, so as to form a pressure test environment.

[0042] Application Example 1

[0043] Torque measurement in normal temperature environment

[0044] In this embodiment, the torque measurement device is mainly used for motor torque measurement in normal temperature environment.

[0045] Torque measurement: when the motor is running, the torque generated by the rotor is transmitted to the force arm through the motor shell, and the force arm acts the counter torque on the weighing sensor. The weight value measured by the weighing sensor is the component of the torque acting on it. Through calculation, the length of the force arm multiplied by the weight value measured by the sensor can obtain the output torque of the motor. For example, assuming that the length of the force arm is 0.5 meters and the weight measured by the weighing sensor is 10 kilograms, the torque calculation is: 0.5 meters x 10 kilograms = 5 kilograms·meters. This torque is the output torque of the motor under the condition.

[0046] Application Example 2

[0047] Oil-sealed torque test in low-temperature environment

[0048] In this application example, the torque measurement device is applied to oil-sealed torque test in low-temperature environment. The torque measurement system comprises a tension sensor, a servo motor, a counter sensor, a universal joint, a low-friction oil seal, a test workpiece rotor, a test workpiece stator, a low-temperature thermocouple, and liquid nitrogen.

[0049] Preparation of test workpiece: the test workpiece includes a rotor and a stator, and a low-friction oil seal is installed around it. In order to simulate a low-temperature environment, the test workpiece is provided with a low-temperature environment by liquid nitrogen. A low-temperature thermocouple is installed near the test workpiece for monitoring the temperature of the test area, ensuring that the workpiece maintains a preset temperature in low temperature.

[0050] Similar to embodiment 1, the length of the force arm and the configuration of the weighing sensor remain unchanged, but it must be ensured that the material performance of these components is stable in low-temperature environment.

[0051] Low-friction oil seal torque test: the servo motor drives the test workpiece rotor to rotate through the universal joint, and the counter sensor is used to measure the rotating speed, ensuring that the rotor operates at a stable rotating speed. With the rotation of the rotor, the resistance generated by the oil seal in the test workpiece will be transmitted to the force arm through the motor stator and act on the weighing sensor.

[0052] By monitoring the weight change on the load cell in real-time, the torque of the oil seal under low temperature conditions can be calculated. For example, if the load cell shows a weight of 15 kg in a liquid nitrogen environment, and the length of the force arm is 0.5 meters, then the torque of the oil seal under this condition is: 0.5 meters x 15 kg = 7.5 kg·m.

[0053] Data Collection and Analysis: Throughout the test, the low-temperature thermocouple continuously monitors the temperature data around the test workpiece to ensure that the low-temperature environment provided by the liquid nitrogen is stable.

[0054] Torque data is recorded in real-time by the data acquisition system, and the torque characteristics of the oil seal under different rotational speeds and temperature conditions are analyzed. These data can be used to optimize the design of the oil seal or evaluate its performance in extreme environments.

[0055] Application Example 3

[0056] Torque Measurement in High Pressure Environment

[0057] In this application example, the torque measurement device is used for torque testing in high pressure environment. Similar to the tests at normal temperature and low temperature conditions, the configuration of the force arm, load cell, plain bearing and support is basically the same, but considering the impact of high pressure on the equipment, the device needs to be operated inside a high pressure container.

[0058] Configuration of High Pressure Container: The motor and its associated torque measurement device are placed in a sealed high pressure container, and then the high pressure container is pressurized to the target value by a booster pump. The design of the container must ensure that it can withstand the required high pressure environment.

[0059] High pressure sensor and pressure control system are used to maintain the stability of the pressure in the container and ensure the safety of the test environment.

[0060] Torque Measurement: When the motor is running, the force arm generates a counter torque on the load cell through the motor housing. Although the high pressure environment may have some impact on the measurement device, due to the proper design of the plain bearing, the housing can still rotate freely, ensuring measurement accuracy. For example, in a high pressure environment, the load cell measures a weight of 12 kg, and the length of the force arm is 0.5 meters, then the torque is calculated as: 0.5 meters x 12 kg = 6 kg·m.

[0061] Performance Evaluation in High Pressure Environment: After the test, by analyzing the torque data measured under different pressure conditions, the performance stability and reliability of the equipment are evaluated, especially the mechanical response of the device under high pressure.

[0062] The above description of the embodiments is to facilitate the ordinary skilled in the art to understand and use the utility model. The person skilled in the art can obviously easily make various modifications to these embodiments, and the general principles described herein are applied to other embodiments without the need for creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by the person skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A torque measuring device for torque measurement of an electric machine (1), characterized in that The torque measuring device comprises: a universal joint (5) arranged at the end of the output shaft of the motor (1); a force arm (2) connected with the shell of the motor (1); a support (3) provided with a plane bearing, the output shaft of the motor (1) penetrates the plane bearing and is connected with the first rotating surface of the plane bearing, and the second rotating surface of the plane bearing is connected with the support (3); a weighing sensor (4) arranged on the support (3), the force arm (2) is connected with the weighing sensor (4), and when the motor (1) operates, the counter-torque generated by the shell of the motor (1) acts on the weighing sensor (4) through the force arm (2).

2. A torque measuring device according to claim 1, characterised in that The motor (1) is a servo motor.

3. A torque measuring device according to claim 1, wherein The support (3) comprises a horizontal support plate.

4. A torque measuring device according to claim 3, characterised in that The output shaft of the motor (1) is perpendicular to the horizontal support plate.

5. A torque measuring device according to claim 3, wherein The horizontal support plate is provided with a mounting hole, and the second rotating surface of the plane bearing is fixedly connected with the edge of the mounting hole.

6. A torque measuring device according to claim 5, characterised in that The output shaft of the motor (1) penetrates the bearing hole of the plane bearing and is connected with the first rotating surface of the plane bearing.

7. A torque measurement system characterized by, The torque measuring device comprises: a component to be tested fixing part (9) for fixing the component to be tested, the component to be tested being connected with the universal joint (5); a counter sensor (6) arranged on the support (3) and used for acquiring the rotating speed of the output shaft of the motor (1); a computer terminal in communication connection with the motor (1), the weighing sensor (4) and the counter sensor (6) respectively.

8. A torque measurement system according to claim 7, wherein, The component to be tested fixing part (9) is provided with a liquid nitrogen injection cavity (7) for cooling the component to be tested fixing part (9) by liquid nitrogen, so as to place the component to be tested in a low-temperature test environment, and the component to be tested fixing part (9) is provided with a low-temperature thermocouple (8) in communication connection with the computer terminal.

9. The torque measurement system of claim 7, wherein, The component to be tested comprises a component to be tested fixing part (9) matched with the inner wall of the component to be tested fixing part (9) and a component to be tested rotating part (10) sleeved in the component to be tested fixing part (9), and the component to be tested rotating part (10) is connected with the universal joint (5). A gap cavity is arranged between the component to be tested fixing part (9) and the component to be tested rotating part (10), and the gap cavity can be filled with low-friction sealing oil.

10. The torque measurement system of claim 7, wherein, The torque measuring system further comprises a pressure-resistant cover capable of sealingly accommodating the torque measuring device, the component to be tested fixing part, the counter sensor (6) and the component to be tested, so as to form a pressure test environment.

Images