CN2641619Y

CN2641619Y - Infrared torque measurer

Info

Publication number: CN2641619Y
Application number: CN 03241358
Authority: CN
Inventors: 黎明发; 吴波; 祁美兰; 别体军
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2003-04-24
Filing date: 2003-04-24
Publication date: 2004-09-15
Anticipated expiration: 2013-04-24

Abstract

The utility model relates to an infrared type torque measuring instrument, and is characterized in that a rotating axle concentric with a rotating component to be measured is fixed on the rotating component to be measured, a power electrical brush and a emitting circuit on the an axle are fixed on the rotating axle, the output of a strain sensing element on the rotating component to be measured is connected with the emitting circuit on the axle, the signal sent from the emitting circuit on the axle on the rotating axle is received by a receiving circuit, and the output of the receiving circuit is connected with a computer or a display device. Because the utility model adopts the infrared transferring method to perform transmission of the straining signal on the rotating component, the signal is received by photo rectifiers on a still object, and sent to a PC to perform the signal disposal, to obtain the measure result, and when the utility model is used in toque measure, the error is small, and the data accuracy is high.

Description

The infrared type torque measurer

Technical field

The utility model belongs to the Experimental Mechanics measuring technology, is a kind of infrared type torque measurer specifically.

Background technology

When carrying out mechanical analysis, often adopt experimental technique to measure various parameters, the strain electrical measuring method is the mechanics parameter measuring method of using always.It is realized by signal on the strainometer is delivered to strain measuring instrument.Measure in strain rotating member, because strainometer rotates with member, and strain measuring instrument is static, therefore measure cumbersome, need transmit the axle of strain signal by some equipment from rotation, and require that error tries one's best little.When rotating member is carried out stress-strain measurement, with current collector the signal of strainometer is passed to normally at present that strainmeter measures.Current collector commonly used has following 4 kinds: electric brush type, stay-supported, mercury formula and induction type.All there are some inevitable shortcomings that get in the strain signal transmission of these 4 kinds of modes.The contact resistance of electric brush type current collector is bigger, and mission life is short; Stay-supported is disposable use then, and contact resistance is big, and can only be used for the low occasion of rotating speed; The electric index of mercury formula current collector is all relatively good, but mercury is noxious material, needs to change mercury after this current collector work a period of time, and this has bigger pollution to environment, has reduced in recent years and has used mercury formula current collector; The induction type current collector is made of two pairs of inductive coils, and the gap between the dynamic and static coil changes institute and causes to such an extent that magnetic resistance change rate will have influence on measurement result, this measuring method low precision, and also rotating speed is lower.Under some occasion, also use radiotelemetry, but its use is very restricted also.Frequency modulation (PFM) is generally adopted in radio telemetry, promptly comes modulated carriers with simulating signal, and carrier frequency generally produces with lc circuit, and the parameter of LC element is difficult to accurately guarantee, therefore need carry out pretty troublesome debugging and staking-out work.In addition, the wireless telemetering carrier frequency is generally operational in ultra-short wave band, and metalwork has very strong absorption to ultrashort wave (USW), and most stress-strain measurement work is all carried out metal, so wireless telemetering all has higher requirement to transmitter power and receiver sensitivity, and to obtain high precision, the cost that needs is also very high.

Summary of the invention

The purpose of this utility model provides and a kind ofly can be used for various rotating speed occasions, and the higher infrared type torque measurer of measuring accuracy, to overcome above-mentioned deficiency.

To achieve these goals, the receiving circuit that the utility model is gone up on radiating circuit and the stationary object by the axle on the rotating member constitutes, wherein rotating member is by drive motor, coupling shaft, rotating member to be measured and the strain sensor that sticks on the rotating member to be measured constitute, drive motor drives rotating member to be measured by coupling shaft and rotates, be characterized in: on rotating member to be measured, also be fixed with a turning axle concentric with rotating member to be measured, on turning axle, be fixed with power supply brush and circuit module, the output of the strain sensor on the rotating member to be measured is connected in the last radiating circuit, receiving circuit receives from the axle on the turning axle and goes up the signal that radiating circuit is sent, and the output of receiving circuit is connected with computing machine or display device;

Above-mentioned axle is gone up the output of radiating circuit and is adopted the infrared transmitting tube emission, receiving circuit input adopt infrared receiving tube to receive;

Above-mentioned axle is gone up radiating circuit by amplifying circuit, mould/number (A/D) change-over circuit, central processor CPU 1, photosignal change-over circuit and infrared transmitting tube constitute, wherein the input end of amplifying circuit links to each other with the output terminal of strain sensor, the output terminal of the input termination amplifying circuit of A/D change-over circuit, its output terminal is connected with central processor CPU 1, the input end of photosignal change-over circuit connects central processor CPU 1, and the output of photosignal change-over circuit is connected with infrared transmitting tube;

Above-mentioned receiving circuit is made of infrared receiving tube, photosignal change-over circuit and central processor CPU 2, the input termination infrared receiving tube of photosignal change-over circuit wherein, its output terminal is connected with central processor CPU 2, and the output of central processor CPU 2 is connected with computing machine or display device.

Because the utility model adopts the infrared ray transfer mode that the strain signal on the rotating member is transmitted, on stationary object, accept light signal by photodiode, adjust through amplifying again, obtain digital logic signal, deliver to PC then and carry out signal Processing, obtain measurement result, make when the utility model is used for torque measurement, error is little, data accuracy is high, practical and convenient.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the utility model theory diagram.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is further described, but this embodiment should not be construed as restriction of the present utility model.

The receiving circuit 10 that axle on the utility model rotating member is gone up on radiating circuit 7 and the stationary object constitutes, wherein rotating member is made of drive motor 1, coupling shaft 2, rotating member to be measured 3 and the strain sensor 4 that sticks on the rotating member to be measured, and drive motor 1 drives rotating member 3 to be measured by coupling shaft 2 and rotates.When rotating member 3 deforms under torque, the corresponding variation will take place in the foil gauge resistance 4 that sticks on the rotating member surface, make electric bridge 14 output voltage signals, because this voltage signal is fainter, so this signal is amplified into mould/number (A/D) change-over circuit through amplifying circuit 11 and changes, the digital quantity that obtains is sent in serial asynchronous communication mode (UART) by singlechip CPU 1, only need single line just passable during the UART one-way transmission, but will select identical baud rate in advance.Launch with the form of light by infrared transmitting tube 8 through photosignal change-over circuit 12 serial digital amounts.Receiving circuit 10 receives the light signal of infrared transmitting tube 8 by infrared receiving tube 10, obtain digital logic signal through photosignal change-over circuit 13 again, send the data that obtain to another one singlechip CPU 2 and handle, the result of singlechip CPU 2 processing can directly show by display device if desired; The result that singlechip CPU 2 is handled also can directly transmit a PC.

Axle on the rotating member 3 of the present utility model is gone up the power supply of radiating circuit 7 by 5 supplies of the power supply brush on the turning axle 6.

The content that is not described in detail in this instructions belongs to the those skilled in the art known prior art.

Claims

1, a kind of infrared type torque measurer, the receiving circuit of being gone up on radiating circuit (7) and the stationary object by the axle on the rotating member (3) (10) constitutes, wherein rotating member (3) is by drive motor (1), coupling shaft (2), rotating member to be measured (3) and the strain sensor (4) that sticks on the rotating member to be measured (3) constitute, drive motor (1) drives rotating member to be measured (3) by coupling shaft (2) and rotates, it is characterized in that: on rotating member to be measured (3), also be fixed with a turning axle (6) concentric with rotating member to be measured (3), on turning axle (6), be fixed with upward radiating circuit (7) of power supply brush (5) and axle, the output of the strain sensor (4) on the rotating member to be measured (3) is connected in the last radiating circuit (7), receiving circuit (10) receives from the axle on the turning axle (6) and goes up the signal that radiating circuit (7) is sent, and the output of receiving circuit (10) is connected with computing machine (PC) or display device (CRT).

2, infrared type torque measurer as claimed in claim 1 is characterized in that: infrared transmitting tube (8) emission is adopted in the output of radiating circuit on the axle (7), and the input of receiving circuit (10) adopts infrared receiving tube (9) to receive.

3, infrared type torque measurer as claimed in claim 1 or 2, it is characterized in that: radiating circuit on the axle (7) is by amplifying circuit (11), mould/number conversion circuit (A/D), central processing unit (CPU1), photosignal change-over circuit (12) and infrared transmitting tube (8) constitute, wherein the input end of amplifying circuit (11) links to each other with the output terminal of strain sensor (4), the output terminal of the input termination amplifying circuit (11) of mould/number conversion circuit (A/D), its output terminal is connected with central processing unit (CPU1), the input end of photosignal change-over circuit (12) connects central processing unit (CPU1), and the output of photosignal change-over circuit (12) is connected with infrared transmitting tube (8).

4, infrared type torque measurer as claimed in claim 1 or 2, it is characterized in that: receiving circuit (10) is made of infrared receiving tube (9), photosignal change-over circuit (13) and central processing unit (CPU2), the input termination infrared receiving tube (9) of photosignal change-over circuit (13) wherein, its output terminal is connected with central processing unit (CPU2), and the output of central processing unit (CPU2) is connected with computing machine (PC) or display device (CRT).