CN203148611U - Tension sensor - Google Patents

Abstract

The utility model discloses a tension sensor, which comprises a tension bridge, an integrated chip, an EEPROM and a PC machine, the integrated chip realizes bidirectional communication with the EEPROM and the PC machine, and the input end of the tension bridge and the integrated chip are connected. By processing with the integrated chip, the integrated level is high, the performance is stable, the linearity reaches as high as less than 1%, zero point and linearity temperature drift are in a range of + or- 100 PPM, the zero point temperature drift can keep in . The high quality products can be produced. The defective rate is low, the production is convenient, after once setting, pressure calibration due to temperature change is not required for being carried out again.

Description

A kind of tension pick-up

Technical field

The utility model relates to sensor, more particularly, relates to a kind of tension pick-up for textile industry.

Background technology

In textile industry, a necessary procedure is exactly that many very thin lines are twisted with the fingers into one thicker line, this equipment is called twisting machine, and its work principle is exactly that a main driven by motor master file wheel drives the multiply fine rule when rotating and rotating and be twisted into one, and finally receives on the reel.This main rotating speed of motor has just determined lay and the degree of tightness of the line twisted with the fingers, and special in the bigger line of some elastic force, if rotating speed control is bad, the line of twisting with the fingers out is defective substantially.In order to reach requirement, design a kind of tension detection system of line, and convert tension force to proportional voltage signal and remove to control motor speed, make tension force keep within the specific limits the wire gauge lattice unanimity of twisting with the fingers out like this, qualification rate height.As shown in Figure 1, wherein 21 is that voltage-stabilized power supply circuit, 22 is control module abbreviation MCU, and 23 is that bridge excitation circuit, 24 is that tension force electric bridge, 25 is that low-pass filter circuit, 26 is that signal amplification circuit, 27 is output circuit.The tension force electric bridge is under the certain voltage excitation, receive that tension force produces a weak voltage signal, deliver to the output circuit of MCU and back level after wave circuit and amplifying circuit amplify after filtration, the equal proportion output voltage signal, and feed back to again on the driving voltage through the signal after the MCU processing, carry out linear compensation.After existing tension pick-up adopts the tension force electric bridge to obtain pressure signal, amplify the output of compensation back through filtering, the linearity is generally controlled in 5%, temperature drift is bigger, can satisfy the general requirement of twisting thread, but in Various Seasonal, different will often manually adjustment of temperature arranges pressure limit, gives to produce to use and makes troubles.Therefore there is following shortcoming in the tension pick-up of prior art: 1) do not have accurate corrective network, the linearity is relatively poor, can control in 5%.2) not temperature compensated, or only depend on the integrated temperature compensation of electric bridge itself, so that temperature is floated is bigger, when bigger variation takes place environment temperature, problems such as zero point drift and linearity variation can take place.3) circuit complexity, debugging relies on artificial judgment, and error is big, and consistance is bad.

The utility model content

At the defective that exists in the prior art, the purpose of this utility model provides a kind of tension pick-up.

For achieving the above object, the utility model adopts following technical scheme:

A kind of tension pick-up, comprise the tension force electric bridge, also comprise integrated chip, EEPROM and PC, described integrated chip is realized two-way communication with described EEPROM and described PC respectively, and the input end of described tension force electric bridge and output terminal all link to each other with integrated chip.

Described integrated chip comprises communication module, logic controller and temperature sensor, and described communication module realizes two-way communication with EEPROM, PC and logic controller respectively, and described logic controller also links to each other with the constant current drive circuit by the D/A change-over circuit;

The output terminal of described constant current drive circuit links to each other with the input end of described tension force electric bridge; The output terminal of described tension force electric bridge links to each other with described logic controller by low-pass filter circuit, pre-amplification circuit and A/D change-over circuit successively; Described logic controller also links to each other with back level amplification output circuit by the D/A change-over circuit;

The output terminal of described temperature sensor links to each other with described logic controller.

Compared with prior art, adopt a kind of tension pick-up of the present utility model, handle by integrated chip, the integrated level height, stable performance, the linearity is up in 1%, zero point and Linear Temperature are floated, zero point temperature float remain on ± 100PPM in.This had both guaranteed to produce high-quality product, and defect rate is low, can conveniently produce again, did not need after once setting to recalibrate pressure because of temperature variation.Tension pick-up of the present utility model has following beneficial effect:

1) performances such as the precision of product, the linearity, temperature drift is improved greatly.

2) integrated level height, be product in order to miniaturization, range of application increases greatly.

3) produce debugging conveniently, the labor savings resource reduces production costs, and makes product have stronger competitive edge in market.

In a word, adopting the integrated chip in the tension pick-up of the present utility model is highly integrated high-performance system-on-a-chip, integrated pre-filtering in one chips, preposition amplification, linear compensation, zero compensation, temperature compensation, constant current constant voltage driving, temperature sensor, back level are amplified output, single line communication, logic control element etc. module, stable performance, the precision height, the band temperature sensor, can realize the precise dose compensation, can carry out single line with exterior PC communicates by letter, debug simple and convenient, good product consistency.

Description of drawings

Fig. 1 is the principle schematic of tension pick-up of the prior art;

Fig. 2 is the principle schematic of a kind of tension pick-up of the present utility model.

Embodiment

Further specify the technical solution of the utility model below in conjunction with drawings and Examples.

See also a kind of tension pick-up shown in Figure 2, comprise tension force electric bridge 13, integrated chip 14, EEPROM11 and PC 12, integrated chip 14 is realized two-way communication with EEPROM11 and PC 12 respectively, and the output terminal of the input end of tension force electric bridge 13 and tension force electric bridge 13 all links to each other with integrated chip 11.

Integrated chip 14 comprises communication module 141, logic controller 142 and temperature sensor 143, communication module 141 realizes two-way communication with EEPROM11, PC 12 and logic controller 142 respectively, and logic controller 142 also links to each other with constant current drive circuit 144 by D/A change-over circuit 149;

The output terminal of constant current drive circuit 144 links to each other with the input end of tension force electric bridge 13; The output terminal of tension force electric bridge 13 links to each other with logic controller 142 by low-pass filter circuit 145, pre-amplification circuit 146 and A/D change-over circuit 147 successively; Logic controller 142 also links to each other with back level amplification output circuit 148 by D/A change-over circuit 149;

The output terminal of temperature sensor 143 links to each other with logic controller 142.

The integrated level height of tension pick-up of the present utility model, all signals amplify, handle, compensate and all finish in an integrated chip, and peripheral circuit is simple; Tension force electric bridge 13 is used for converting tension signal to electric signal; Voltage-stabilized power supply circuit 150 is used for providing reliable and stable constant voltage source to integrated chip; EEPROM11 is used for storing the storage chip of offset data.

Tension pick-up of the present utility model adopts the constant current source of constant current drive circuit to provide excitation for tension force electric bridge assembly, because the temperature varying coefficient of the arm resistance of tension force electric bridge is the same, cause that by temperature variation change in resistance is cancelled because of current constant like this, the temperature at zero point of circuit is floated very little.

Tension pick-up of the present utility model by the tension force electric bridge because of the perception tension variation and convert the weak voltage signal to, pre-amplification circuit by controllable gain behind low-pass filter circuit amplifies, change into digital signal by 16bit A/D change-over circuit and send logic controller to, logic controller is by being pre-stored in linear compensation data and the temperature compensation data in the EEPROM and passing through the detected real time temperature of temperature sensor, calculate the back through special algorithm and export control signal adjustment bridge excitation on the one hand, convert output signal to analog voltage signal by the D/A change-over circuit on the other hand, and export and the proportional voltage signal of tension force through the back level output amplifier of controllable gain.

Tension pick-up of the present utility model adopts outer PC to come calibration product by the mode of single line communication, has removed the artificial link of regulating by potentiometer from.After the complete machine assembling is finished, only need click the mouse slightly and can finish calibration fast, it is convenient to bring for the production debugging, has saved human resources.

Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the purpose of this utility model, and be not with opposing restriction of the present utility model, as long as in essential scope of the present utility model, all will drop in the scope of claim of the present utility model variation, the modification of the above embodiment.

Claims (2)

1. a tension pick-up comprises the tension force electric bridge, it is characterized in that:

Also comprise integrated chip, EEPROM and PC, described integrated chip is realized two-way communication with described EEPROM and described PC respectively, and the input end of described tension force electric bridge and output terminal all link to each other with integrated chip.

2. tension pick-up according to claim 1 is characterized in that:

Described integrated chip comprises communication module, logic controller and temperature sensor, and described communication module realizes two-way communication with EEPROM, PC and logic controller respectively, and described logic controller also links to each other with the constant current drive circuit by the D/A change-over circuit;

The output terminal of described constant current drive circuit links to each other with the input end of described tension force electric bridge; The output terminal of described tension force electric bridge links to each other with described logic controller by low-pass filter circuit, pre-amplification circuit and A/D change-over circuit successively; Described logic controller also links to each other with back level amplification output circuit by the D/A change-over circuit;

The output terminal of described temperature sensor links to each other with described logic controller.

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