CN113910145A

CN113910145A - Torque wrench capable of applying fixed torque to small motor

Info

Publication number: CN113910145A
Application number: CN202111140561.8A
Authority: CN
Inventors: 王寅喆; 陈坤
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-01-11

Abstract

The invention discloses a torque wrench capable of applying fixed torque to a small motor, which comprises a coupler, a speed change gear, a driving motor, a detection device and a display screen, wherein the coupler is used for connecting a shaft of a measured motor; the speed change gear plays a role in amplifying torque; the driving motor is used for outputting the required torque; the detection device detects whether the output torque reaches a set requirement; the digital display screen is used for displaying the torque required to be output. The invention can apply the required load torque to the small-torque AC/DC motor, and the applied load torque is adjustable; the torque wrench can conveniently observe the load characteristics of the small alternating current and direct current motor, can record the real-time torque and the real-time rotating speed for system model identification, does not need to design a special motor drag experiment for the tested motor, saves a large number of people and resources, and has strong reusability.

Description

Torque wrench capable of applying fixed torque to small motor

Technical Field

The invention relates to the field of torque measurement of small motors, in particular to a torque wrench capable of applying fixed torque to a small motor.

Background

With the continuous promotion of the modern control field, the precision requirement on a system model is higher and higher, and system identification becomes a key ring in the control field.

The load characteristics of the small motor system need to be measured when the small motor system is identified and modeled, but the motor drag experiment is complex, the cost is high, the reusability is poor, the construction period is long, and certain manpower and resources can be wasted. The hysteresis brake is characterized in that special motor driving circuit boards and equipment fixing devices need to be designed for tested motors of different types and sizes, and the hysteresis brake for applying torque is relatively high in price.

The torque wrench is a common tool in the modern industrial field, and has the advantages of being small and convenient. In particular, the electronic torque wrench can measure the torque at the current sleeve, and can display the torque on the liquid crystal screen and store the measured data for later retrieval. However, such torque wrenches can only measure torque and cannot output torque externally, and electric wrenches on the market can output torque externally but cannot be accurately adjusted and controlled for large torque.

Disclosure of Invention

The invention aims to provide a torque wrench capable of applying fixed torque to a small motor, which can stably output the set torque to the outside through a coupling and solve the problem of inconvenience of a motor drag experiment set up in time when the small motor measures load characteristics.

The technical scheme for realizing the invention is as follows: a torque wrench capable of applying fixed torque to a small motor comprises a wrench body, wherein a coupler used for being connected with a shaft of a measured motor is arranged at the front part of the wrench body, a driving motor is arranged in the wrench, and a motor transmission shaft of the driving motor transmits the torque to the coupler through a speed change gear; the outside of the wrench body is provided with a display screen for displaying the torque required to be output.

Further, the interior of the wrench body is also provided with a detection device which comprises an MCU control unit and is used for detecting whether the output torque reaches the set requirement.

Further, the MCU control unit outputs a set torque force outwards by controlling the transmission shaft of the motor.

Furthermore, a torque sensor is arranged on the motor transmission shaft and used for reading the torque and transmitting the torque to the MCU control unit.

Further, the front part of the wrench body is also provided with a button for replacing the coupler.

Furthermore, a button for setting the output torque is arranged outside the wrench body.

Compared with the existing electronic torque wrench on the market, the invention has the advantages that: (1) the torque input device not only can measure the torque input from the outside, but also can output the fixed required torque to the outside, thereby greatly simplifying the experiment for measuring the load torque characteristic of the small motor and saving a large amount of manpower, material resources and resources; (2) the set torque is stably output outwards through the sleeve or the coupling, so that the inconvenience of the small motor in establishing a motor drag experiment in time when the load characteristic is measured can be solved; (3) the small-sized motor shaft coupling has the advantages of small occupied space and very strong reusability, and can apply load torque to small-sized motors with different shaft diameters only by replacing the shaft coupling.

Drawings

Fig. 1 is an overall view of the torque wrench.

Fig. 2 is a front end view of the torque wrench.

FIG. 3 is a cross-sectional view of the front end of the torque wrench.

Detailed Description

According to the invention, through adjusting the internal structure of the torque handle, a proper built-in motor is selected as a power source for applying torque to the outside of the novel torque wrench, so that a set of torque wrench which can not only measure the external torque but also accurately output the torque with adjustable magnitude to the outside is designed. The scheme mainly involves the following:

the design program and the circuit board are used for controlling the output and monitoring of the torque of the built-in motor of the wrench;

the gear speed change structure is used for amplifying the torque of the built-in motor and changing the longitudinal rotating shaft force of the built-in motor into the transverse rotating shaft force;

the detachable and replaceable coupler ensures that the torque wrench can be suitable for small motors with different shaft diameters.

With reference to fig. 1, 2 and 3, the torque wrench capable of applying a fixed torque to a low-torque ac/dc motor of the present invention includes a coupling 4, a transmission gear 7, a driving motor, a detection device, and a display screen 1;

the coupler 4 is used for connecting a shaft of a measured motor; the speed change gear 7 plays a role in amplifying torque; the driving motor is used for outputting the required torque; the detection device detects whether the output torque reaches a set requirement; the display screen 1 is used for displaying the torque required to be output.

The coupling 4 can be connected with a detected small motor shaft and transmits the transmission to the coupling 4 through the speed change gear 7.

Torque power is provided by a rotating shaft 6 of a driving motor built in the torque wrench, and the driving motor is installed inside the wrench body 3.

The motor transmission shaft 6 can output fixed torque force outwards, meanwhile, the required set torque force can be output outwards through the MCU control unit in the torque wrench, the torque force is controlled by other control, the torque force is read by the torque sensor 8 and is transmitted to the MCU control unit, thereby forming closed-loop control, and the torque information can be displayed on the display screen 1. The MCU control unit is a detection device component.

The head of the wrench is also provided with a button 2 for replacing the coupler, and the button is pressed to loosen the latch, release the motor shaft to be tested and automatically clamp and fix the motor shaft to be tested. The interior of the wrench head is also provided with a reduction gear 5 which can rotate and move.

The whole torque wrench can output torque with controllable size, and the whole device is small in size and convenient to operate.

The invention is characterized in that the required load torque can be applied to the small-torque AC/DC motor, and the applied load torque is adjustable. The invention has the advantages that the load characteristic of the small AC/DC motor can be conveniently observed, the real-time torque and the real-time rotating speed can be recorded for system model identification, a special motor pair-dragging experiment is not required to be designed for the tested motor, a large amount of people and resources are saved, and the reusability is stronger.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Examples

The whole body of the invention comprises a coupling, a speed change and direction change gear box, a built-in driving motor, a torque sensor, a display screen, buttons arranged around the display screen, a detection device and a shell of the torque wrench.

The outer shaft is connected and fixed by a coupling 4. The torque required to be output is set through the display screen 1 and the setting button, the internal motor is driven to rotate after the output key is pressed down, and the internal driving motor reaches a stable state in a short time to wait for the torque required to be output externally.

The internal motor shaft 6 in fig. 3 rotates along with the rotation of the internal motor, changes the longitudinal rotation into the transverse rotation through the speed change and direction change gear box 7, and transmits the amplified torque to the coupler 4 through the gear in an equal ratio, so that the required torque is output outwards. Meanwhile, the rotating speed information of the coupler 4 and the torque information output by the current rotating shaft of the motor can be recorded by the MCU in real time, and later data reading is facilitated.

In fig. 3, the torque sensor 8 is a coaxial sensor of the internal motor, and can read the current output torque and rotation speed of the internal motor in real time, and the read values are used for returning to the internal MCU control unit, thereby forming a closed-loop control loop. The torque sensor 8 is a device combining a torque sensing structure and an encoder structure, the power supply of the device is provided by a development board, and an external output circuit comprises a torque signal line and an encoder A phase line and a encoder B phase line.

The built-in motor drive of the invention needs to realize a constant torque output mode, and simultaneously, the required control requirement is that the constant torque steady state can be reached in a very short time and no static error exists. The choice of the internal drive motor is on the one hand to have a high current rating and on the other hand to have a stable torque output.

The invention not only can realize the functions which can be realized by a common electronic torque wrench in the market, but also can realize the torque with adjustable output size, can realize the loading experiment of the small-sized alternating current and direct current motor, and is beneficial to the identification modeling of the small-sized motor.

The invention has the advantages of simplifying the complex motor drag experiment, realizing the adjustable torque output to the outside, and having good application when facing the occasion that the fixed load torque needs to be output to the outside. The invention is small, exquisite, convenient, highly reusable and convenient to operate.

The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims

1. A torque wrench capable of applying fixed torque to a small motor comprises a wrench body and is characterized in that a coupler (4) used for being connected with a motor shaft to be measured is arranged at the head of the wrench body, a driving motor is arranged in the wrench, and a motor transmission shaft (6) of the driving motor transmits the torque to the coupler (4) through a speed change gear (7); the outside of the wrench body is provided with a display screen (1) for displaying the torque required to be output.

2. The torque wrench capable of applying a fixed torque to a small motor according to claim 1, wherein a detection device is further disposed inside the wrench body, and the detection device includes an MCU control unit for detecting whether the output torque reaches a set requirement.

3. The torque wrench capable of applying a fixed torque to a small motor according to claim 2, wherein the MCU control unit controls the motor transmission shaft (6) to output a set torque to the outside.

4. The torque wrench capable of applying a fixed torque to a small motor according to claim 3, wherein a torque sensor (8) is disposed on the motor transmission shaft (6) for reading the torque and transmitting the torque to the MCU control unit.

5. The torque wrench capable of applying a fixed torque to a small motor according to claim 3, wherein the front part of the wrench body is further provided with a button (2) for replacing the coupling.

6. The torque wrench for applying a constant torque to a small motor according to claim 3, wherein a button for setting the magnitude of the output torque is further provided outside the wrench body.