CN201476912U - Dynamic-torque non-contact measuring device based on radio frequency data transmission - Google Patents
Dynamic-torque non-contact measuring device based on radio frequency data transmission Download PDFInfo
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- CN201476912U CN201476912U CN2009202261509U CN200920226150U CN201476912U CN 201476912 U CN201476912 U CN 201476912U CN 2009202261509 U CN2009202261509 U CN 2009202261509U CN 200920226150 U CN200920226150 U CN 200920226150U CN 201476912 U CN201476912 U CN 201476912U
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- dynamic torque
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Abstract
The utility model discloses a dynamic-torque non-contact measuring device based on radio frequency (RF) data transmission. The utility model solves the problems in the original dynamic-torque measuring device of large error, higher cost, inconvenient use, poor anti-interference capability and the like, and generates no contact wear resulted from signal transmission, so that the service life is longer than that of the conductive slip-ring dynamic-torque measuring device. The measuring device structurally comprises a mechanical device mounted on a measured shaft and a measuring circuit, wherein the mechanical device comprises a base, and a base is connected with a casing; an elastic shaft and a corresponding bearing device thereof are mounted in the casing; a shaft sleeve is arranged on the elastic shaft; an annular circuit board is mounted on the shaft sleeve; the measuring circuit comprises a lower computer and an upper computer, wherein the lower computer is mounted on the annular circuit board to complete the measurement and the transmission of dynamic-torque signals; and the upper computer and the lower computer are in wireless communication to display, record and analyze received information.
Description
Technical field
The utility model relates to a kind of dynamic torque measurement mechanism, particularly a kind of dynamic torque non-cpntact measurement device based on the rf data transmission.
Background technology
Whether qualified dynamic torque is the basic load form of various work transmission shafts, is the important indicator of rotating machinery power output, be one of check product sign, is the required argument of calculating machine power and efficient.The measurement of dynamic torque determines and control transmission shaft load, and the Intensity Design of each working part of kinematic train and prime mover choice of capacity etc. are all had crucial meaning.
The dynamic torque measurement mechanism utilizes strain bridge that the dynamic torque of turning axle is converted into voltage signal generally based on the resistance-strain principle.Because strain bridge sticks on the turning axle,, all must rely on conducting slip ring traditionally to the electric bridge power supply with from the bridge circuit output signal.Easy to wear between brush and the slip ring, and cause that easily contact resistance changes, and then bring noise and drift, cause measuring error bigger, so high speed rotating and the bigger occasion of shaft vibration are lacked and be not suitable for to mission life.Normal at present rotary transformer power supply and the transmission signals of adopting.The rotary transformer core is frangible, and maximum rotative speed still is restricted.Primary and secondary to introducing noise and error influences measuring accuracy.Rotary transformer needs the special signal modulate circuit, so that produce the receivable signal of specific data acquisition device, measures cost thereby further increase.The infrared ray transmit-receive technology adopts the connected mode of point-to-point, has directivity.The shortcoming of this technology is to be only limited to two device talks, can't constitute network flexibly.And between the equipment restraining mass can not be arranged during infrared technique transmission data, coverage is little.Application infrared transmission mode is carried out the dynamic torque measurement and is used inconvenience and application scenario that certain restriction is arranged.
Summary of the invention
The purpose of this utility model is exactly bigger in order to solve original dynamic torque measurement mechanism error, cost is higher, use inconvenience, problems such as poor anti jamming capability, provide a kind of have simple in structure, easy to use, cost is low, the dynamic torque non-cpntact measurement device based on the rf data transmission of measuring accuracy advantages of higher.This device is used the noncontact transmission that radio-frequency technique realizes the dynamic torque signal, and simple in structure, easy to use, error is little, and cost is low.In the on-line measurement process of dynamic torque, so the contact wear that this device does not exist signal to transmit is than the dynamic torque measurement mechanism longer service life of conducting slip ring formula.
For achieving the above object, the utility model adopts following technical scheme:
A kind of dynamic torque non-cpntact measurement device based on the rf data transmission, it is made up of mechanical hook-up and metering circuit two parts of being installed on the measured axis, wherein mechanical hook-up comprises base, base is connected with casing, elastic shaft and corresponding bearing arrangement are installed in casing, on elastic shaft, be provided with axle sleeve, annular circuit board is installed on the axle sleeve; Metering circuit is made up of slave computer and host computer, and wherein slave computer is installed in annular circuit board, finishes the measurement emission of dynamic torque signal; Host computer and slave computer radio communication are to information demonstration, record and the analyzing and processing that receives.
Described bearing arrangement comprises deep groove ball bearing, deep groove ball bearing and bearing (ball) cover assembling, bearing (ball) cover and end cap assembling.
Described slave computer comprises the resistance-strain electric bridge, and resistance-strain electric bridge two ends are connected with the DC/DC chip, and the DC/DC chip connects and is connected with lithium battery; The residue two ends of resistance-strain electric bridge are connected with amplifier, and amplifier is concatenated filter, analog to digital converter, single-chip microcomputer I successively, and single-chip microcomputer I is connected with RF transmit-receive circuit I.
Described host computer comprises RF transmit-receive circuit II, and it is connected with single-chip microcomputer II, and single-chip microcomputer II then is connected with keyboard-display circuit with printer respectively, and he can thigh be that single-chip microcomputer also is provided with USB interface and RS232 interface.
Dynamic torque non-cpntact measurement device based on the rf data transmission of the present utility model, it is made up of physical construction and circuit two parts.Physical construction is by base, casing, elastic shaft, bearing, axle sleeve, compositions such as screw.Circuit comprises slave computer and host computer.Slave computer is finished the measurement emission of dynamic torque signal.Host computer is finished reception, demonstration, record, analyzing and processing of dynamic torque signal etc.Slave computer is by the resistance-strain electric bridge, amplifier, wave filter, single-chip microcomputer I, compositions such as RF transmit-receive circuit I.Host computer is by RF transmit-receive circuit II, single-chip microcomputer II, and keyboard-display circuit and USB, communication interfaces such as RS-232 are formed.
Measuring principle of the present utility model:
Based on the resistance-strain principle, the dynamic torque signal is converted into voltage signal, carry out the A/D conversion after voltage signal amplifies, at last by the measuring-signal of single-chip microcomputer I control RF transmit-receive circuit I after conversion be transmitted into that RF transmit-receive circuit II shows, record and analyzing and processing.
It is as follows that each chief component of the utility model is introduced its principle of work:
One, resistance-strain electric bridge
Turning axle is subjected to dynamic torque to do the time spent, has small torsional deflection.Resistance strain gage is a sensing element commonly used of measuring small strain, can be used to measure parameters such as dynamic torque.Foil gauge is sticked on flexible member with special glue maybe to be needed to measure on the body surface of distortion.Under the effect of dynamic torque, foil gauge promptly is out of shape together in company with flexible member, its resistance generation respective change.Thus, the dynamic torque variation is converted to resistance variations.It has advantages such as volume is little, dynamic response is fast, measuring accuracy is high, easy to use.
The resistance-strain electric bridge is a kind of metering circuit that changes in resistance is become voltage or electric current output.Its output both can directly be measured with indicating instrument, also can send into amplifier and amplify.Bridge measuring circuit is simple, and has higher accuracy and sensitivity, is widely used in measurement mechanism.In measuring technology, generally electric bridge is divided into semibridge system and connects with full-bridge type according to the brachium pontis number of resistance participation variation in the work.The connection difference of electric bridge, for identical deformation quantity input, the voltage of output is also different, and the full-bridge connection can obtain maximum output.For improving measuring accuracy, the utility model adopts the full-bridge connecting mode.
Two, signal amplifier
Because it is less relatively that the voltage of strain resistor electric bridge output, electric current change, and needed through conditioning before converting digital quantity to usually.Modulate circuit makes measuring-signal be suitable for the input range of analog to digital converter (ADC) by the measures such as amplitude of amplification, filtering, adjustment simulating signal, then should be signal digitalized by ADC, and send to microprocessor or other digital device, and then finish further data processing.
When to the forward and reverse loading of dynamic torque measurement mechanism, strain bridge is output as bipolar signal.Bipolar signal is added on the single supply ADC the normally very difficult thing of part, because this requires bipolar signal is transformed into the unipolarity input range of the permission of ADC.The utility model has adopted a kind of simple and quick method of realizing this conversion.The earth terminal that is exaggerated device for the reverse voltage signal that prevents to export " is eaten up ", with the reference voltage terminal raising of amplifier.When making dynamic torque reversal load maximum like this, amplifier output forward voltage signal minimum; When the dynamic torque forward loads maximum, amplifier output forward voltage signal maximum.
Three, single chip machine controlling circuit
In the utility model, two single-chip microcomputers are its cores.It will receive the dynamic torque measurement data after the A/D conversion on the one hand, also will handle measurement data on the other hand and control RF transmit-receive circuit that result is transmitted into radio-frequency (RF) Receiving Device.During work, single-chip microcomputer adopts powered battery, and rotates together in company with turning axle.So two single-chip microcomputers that adopt in the utility model need have characteristics such as low-power consumption, speed is fast, stability is strong.ADC is the core component of analog input channel, and it is converted to single-chip microcomputer to analog voltage signal can handle digital quantity.The dynamic torque measurement mechanism is had relatively high expectations to measuring accuracy, so require to adopt high-precision adc.The utility model slave computer circuit concentrates on the annular circuit board.Annular circuit board is axially fixed on the elastic shaft.For saving circuit board space, the utility model adopts inner integrated high-precision adc, is suitable for powered battery, and it is little to meet physical dimension, the single-chip microcomputer that requires that waits easy to use.
Four, two RF transmit-receive circuits
By radio frequency transmission the dynamic torque measuring-signal is transmitted into radio-frequency (RF) Receiving Device, thereby realizes the non-cpntact measurement of dynamic torque.Radio frequency transmission is a part crucial in the dynamic torque measurement mechanism.Because measurement data will transmit in real time, therefore need highly stable reliable radio frequency transmission unit under dynamical state.
Radio frequency transmission is generally used the monolithic radio frequency transceiving chip, adds controller and the special-purpose or general wireless communication module of a small amount of peripheral components formation.Communication module generally comprises the Data Transport Protocol of simple transparent or uses simple cryptographic protocol.The user need not be shaped on darker understanding to wireless communication principles and working machine, can realize basic wireless transmission function as long as operate according to command word.Its power is little, and exploitation is fast simple.Advantages such as the dynamic torque non-cpntact measurement device based on the rf data transmission has realization easily, and is easy to use.
Description of drawings
Fig. 1 installs schematic diagram for device;
Fig. 2 is a device for mechanical structural drawing installation drawing;
Fig. 3 is a slave computer principle frame;
Fig. 4 is a device host computer theory diagram.
Wherein, 1 base, 2 end caps, 3 bearing (ball) covers, 4 deep groove ball bearings, 5 elastic shafts, 6 slotted countersunk flat head screws, 7 hexagon socket cap head screws, 8 packing rings, 9 axle sleeves, 10 annular circuit boards, 11 casings, 12 lithium batteries, 13DC/DC chip, 14 strain resistor electric bridges, 15 amplifiers, 16 wave filters, 17 analog to digital converters, 18 single-chip microcomputer I, 19 RF transmit-receive circuit I, 20 single-chip microcomputer II, 21 RF transmit-receive circuit II, 22 printers, 23USB interface, 24 keyboard-display circuits, 25RS232 interface.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Among Fig. 1, the utility model mainly is made up of mechanical hook-up and metering circuit two parts, wherein mechanical hook-up by shaft coupling with connected by measured motor and load (magnetic powder brake).Metering circuit comprises host computer and slave computer, down for machine is installed on the mechanical hook-up, gathers measuring-signal, and the host computer reception contains the radiofrequency signal of dynamic torque information to show record and analyzing and processing.
Fig. 2 is the structural representation of mechanical hook-up.It comprises base 1, and base 1 is connected with casing 11, is provided with end cap 2 in the end of base 1 and casing 11, and bearing (ball) cover 3 assembles by slotted countersunk flat head screw 6 and end cap 2, bearing (ball) cover 3 and deep groove ball bearing 4 assemblings simultaneously, and elastic shaft 5 is assemblied on the deep groove ball bearing 4.End cap 2 is connected with casing 11 by hexagon socket cap head screw 7.Elastic shaft 5 is connected with axle sleeve 9 by hexagon socket cap head screw 7, and annular circuit board 10 is connected with axle sleeve 9 with packing ring 8 by slotted countersunk flat head screw 6.Host computer is installed on the annular circuit board 10.
Be the slave computer structural drawing among Fig. 3, it comprises strain resistor electric bridge 14, and the two ends of strain resistor electric bridge 14 are connected with DC/DC chip 13, and DC/DC chip 13 is connected with lithium battery 12.The residue two ends of strain resistor electric bridge 14 are connected with amplifier 15, wave filter 16, analog to digital converter 17, single-chip microcomputer I18 and RF transmit-receive circuit I successively.
Slave computer is measured with radiating circuit and is adopted the strain bridge of full-bridge connection to experience the torsional strain of turning axle.When dynamic torque is carried on the elastic shaft, electric bridge output dynamic voltage signal.The power supply module of compositions such as lithium battery and DC/DC chip provides power supply to slave computer.The electric bridge output signal directly links to each other with amplifier with instrument.It has carried out the single power supply optimal design, and is low in energy consumption, is fit to powered battery.Reference voltage end at amplifier adds forward bias voltage, makes amplifier output voltage be displaced to the forward voltage scope.Thereby the unipolarity voltage signal of realizing electric bridge output is converted to the bipolar voltage signal.So just in time satisfy the input range that the single-chip microcomputer chip integration becomes ADC.The voltage signal of amplifier output is launched by the Single-chip Controlling RF transmit-receive circuit after the A/D conversion.
The resistance-strain electric bridge is processed into the less rectangular area of area of section in the middle of sticking on elastic shaft.Measure with radiating circuit and concentrate on the 17-annular circuit board.Be processed with keyway on the elastic shaft of physical construction, can with connected by shaft coupling by measured motor and load.Be processed into the less rectangular area of area of section in the middle of the elastic shaft, amount of elastic deformation is increased, also make the convenient stickup of strain bridge on the other hand.The axle sleeve that counterbore is arranged by the screw fixed radial of radially processing on the axle.Axle sleeve side axial machining screw through hole is with the stationary annular circuit board.The board design that rotates together with the axis circularizes, and can make full use of the casing inner space, can prevent that centrifugal force from causing eccentric problem simultaneously.
Be the host computer structural drawing among Fig. 4, it comprises RF transmit-receive circuit II21, and RF transmit-receive circuit II21 is connected with single-chip microcomputer II20, and single-chip microcomputer II20 is connected with printer 22, keyboard-display circuit 24, USB interface and RS232 interface respectively.
Host computer is mainly finished work such as signal reception, demonstration, record and analyzing and processing.Radio-frequency (RF) receiving circuit is sent into single-chip microcomputer to the dynamic torque measuring-signal of receiving and is carried out calculation process, is converted to corresponding torque value.Single-chip microcomputer extended keyboard display interface strengthens human-computer interaction function.Can print measurement data by expanding printing machine interface.And can pass through USB, communication interface such as RS-232 and computing machine etc. link.
Claims (4)
1. dynamic torque non-cpntact measurement device based on rf data transmission, it is characterized in that, it is made up of mechanical hook-up and metering circuit two parts of being installed on the measured axis, wherein mechanical hook-up comprises base, base is connected with casing, elastic shaft and corresponding bearing arrangement are installed in casing, on elastic shaft, are provided with axle sleeve, annular circuit board is installed on the axle sleeve; Metering circuit is made up of slave computer and host computer, and wherein slave computer is installed in annular circuit board, finishes the measurement emission of dynamic torque signal; Host computer and slave computer radio communication are to information demonstration, record and the analyzing and processing that receives.
2. the dynamic torque non-cpntact measurement device based on the rf data transmission as claimed in claim 1 is characterized in that described bearing arrangement comprises deep groove ball bearing, deep groove ball bearing and bearing (ball) cover assembling, bearing (ball) cover and end cap assembling.
3. the dynamic torque non-cpntact measurement device based on the rf data transmission as claimed in claim 1 is characterized in that described slave computer comprises the resistance-strain electric bridge, and resistance-strain electric bridge two ends are connected with the DC/DC chip, and the DC/DC chip connects and is connected with lithium battery; The residue two ends of resistance-strain electric bridge are connected with amplifier, and amplifier is concatenated filter, analog to digital converter, single-chip microcomputer I successively, and single-chip microcomputer I is connected with RF transmit-receive circuit I.
4. the dynamic torque non-cpntact measurement device based on the rf data transmission as claimed in claim 1, it is characterized in that, described host computer comprises RF transmit-receive circuit II, it is connected with single-chip microcomputer II, single-chip microcomputer II then is connected with keyboard-display circuit with printer respectively, and he can thigh be that single-chip microcomputer also is provided with USB interface and RS232 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202261509U CN201476912U (en) | 2008-11-03 | 2009-09-10 | Dynamic-torque non-contact measuring device based on radio frequency data transmission |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820174683.2 | 2008-11-03 | ||
| CN2009202261509U CN201476912U (en) | 2008-11-03 | 2009-09-10 | Dynamic-torque non-contact measuring device based on radio frequency data transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201476912U true CN201476912U (en) | 2010-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202261509U Expired - Fee Related CN201476912U (en) | 2008-11-03 | 2009-09-10 | Dynamic-torque non-contact measuring device based on radio frequency data transmission |
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| Country | Link |
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| CN (1) | CN201476912U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547129A (en) * | 2014-10-13 | 2016-05-04 | 斯凯孚公司 | Method and data processing device for determining a spacing of rolling elements |
| CN107576428A (en) * | 2016-07-05 | 2018-01-12 | 北京新宇航世纪科技有限公司 | Torque sensing device assembly |
| CN110702283A (en) * | 2019-11-13 | 2020-01-17 | 哈尔滨理工大学 | Torque measuring device for industrial robot arm driving motor |
| US10788382B2 (en) | 2014-10-13 | 2020-09-29 | Aktiebolaget Skf | Method and data processing device for detecting a load distribution in a roller bearing |
-
2009
- 2009-09-10 CN CN2009202261509U patent/CN201476912U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547129A (en) * | 2014-10-13 | 2016-05-04 | 斯凯孚公司 | Method and data processing device for determining a spacing of rolling elements |
| US10788382B2 (en) | 2014-10-13 | 2020-09-29 | Aktiebolaget Skf | Method and data processing device for detecting a load distribution in a roller bearing |
| CN107576428A (en) * | 2016-07-05 | 2018-01-12 | 北京新宇航世纪科技有限公司 | Torque sensing device assembly |
| CN110702283A (en) * | 2019-11-13 | 2020-01-17 | 哈尔滨理工大学 | Torque measuring device for industrial robot arm driving motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20110910 |