CN104504877A - Wireless measuring system for real-time torque of machine tool spindle - Google Patents
Wireless measuring system for real-time torque of machine tool spindle Download PDFInfo
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- CN104504877A CN104504877A CN201410742581.6A CN201410742581A CN104504877A CN 104504877 A CN104504877 A CN 104504877A CN 201410742581 A CN201410742581 A CN 201410742581A CN 104504877 A CN104504877 A CN 104504877A
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Abstract
The invention provides a wireless measuring system for a real-time torque of a machine tool spindle. The system comprises a signal acquiring and transmitting part and a remote monitoring part, wherein the signal acquiring and transmitting part comprises a knife handle assembly, a torque sensor and a locking hood which are installed on the machine tool spindle; the remote monitoring part comprises a wireless signal receiving device and a computer processing system. The wireless signal receiving device is used for receiving signals sent by the signal acquiring and transmitting part and transmitting the signals to the computer processing system for data management and storage and display. According to the system provided by the invention, the problem of contact fatigue wear is avoided and a measuring circuit is protected. By adopting a wireless signal transmission mode based on GPRS, the transmission distance is long and the transmission data rate is high; change of the torque signal in the technical process is monitored by a remote monitoring system in real time, so that the state management, control and safe pre-warning of the technical process are achieved.
Description
Technical field
The present invention relates to the machine tooling monitoring field of machining, particularly, relate to the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis.
Background technology
In machine tooling process, by can understand the machining state of lathe in real time to the detection of machine tool chief axis torque signal, for the fault pre-alarming of formulation and Optimizing Process Parameters and process provides foundation.How being transferred out by the measurement torque signal of turning axle is the emphasis of torque measurement, widely use wired and wireless mode at present to transmit torque signal, wired mode take collector ring as representative, but the use of collector ring limits the rotating speed of axle, there is the problems such as rotating contact fatigue wear, and there is line length interference.The mode of wireless torque transmission receives increasing concern.
Through finding the literature search of prior art, " the wireless torque measuring system research based on ZigBee " that the people such as Song Qian, Ma Shuyuan, Huang Jie deliver at sensor and micro-system (the 32nd volume the 6th phase in 2013), this article adopts strainometer as sensitive element, measurement mechanism is fixed on turning axle, by Zig Bee wireless transmission protocol, data measured is sent on radio receiver, then by Serial Port Transmission to computing machine.Mainly there is following defect and deficiency in the technology contents that this article relates to: needs the leakproofness ensureing whole measurement mechanism when (1) measures moment of torsion, and be the leakproofness of large space; (2) foil gauge circuit is exposed to job shop completely, does not have safeguard procedures, fragile; (3) adopt based on Zig Bee wireless transmission method, although cost is low, low in energy consumption, transmission range is near, data transfer rate is low; (4) just Real-time Collection is carried out to torque signal, do not utilize long distance control system to carry out management and the safe early warning of data.
Summary of the invention
For defect of the prior art, the object of this invention is to provide the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis, this system is easy to install, simple to operate, transmission data rate is high.
The invention provides the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis, comprise signals collecting and radiating portion and remote monitoring part, wherein:
Described signals collecting and radiating portion comprise: be installed on the handle of a knife assembly of machine tool chief axis, torque sensor and card cover, wherein: described torque sensor adopts resistance-strain chip, forms full arm measure electric bridge be arranged on handle of a knife assembly by resistance strain gage; The described card enclosure on handle of a knife assembly, for airtight resistance strain gage protection circuit;
Described remote monitoring part comprises: wireless signal receiver and computer processing system, wherein:
The signal that the collection of described wireless signal receiver Received signal strength and radiating portion send, and be transferred to computer processing system carry out data management and store display;
Described computer processing system comprises torque signal supervisory system and torque signal database, torque signal supervisory system carries out filtering to the received signal, A/D changes, and according to the output voltage of strain gage testing electric bridge and resistance-strain, calculated relationship between resistance-strain and main-shaft torque is translated into torque value, and the change of torque signal in being shown Real Time Observation process on a display screen, set torque safety threshold value in addition, the security reporting to the police to remind staff's process is carried out when the torque signal value in process exceedes threshold value, the electric current obtained will be monitored after process finishing, voltage, torque signal, the Signal transmissions such as acquisition time are to torque signal database, described torque signal database purchase also upgrades electric current, voltage, the torque signal of Real-Time Monitoring.
Preferably, described torque sensor adopts resistance-strain chip, and foil gauge adopts strain bunch and on the symmetrical turning axle be pasted in handle of a knife assembly.
More preferably, described strain bunch comprises orthogonal two panels foil gauge.
Preferably, described card cover adopts loop configuration, is enclosed within handle of a knife assembly, and rotates with handle of a knife assembly.
Preferably, described card cover is inner installs power supply and wireless signal transmitting device, and wireless signal transmitting device is connected with strain gage testing electric bridge, and power supply is that strain gage testing electric bridge and wireless signal transmitting device are powered.
Preferably, described wireless signal transmitting device and wireless signal receiver adopt the transmission mode based on GPRS, have the advantages that real-time online, transfer rate are high, flexible for installation, convenient and reliable.
Preferably, described torque signal supervisory system comprises: ARM single-chip microcomputer, torque monitoring system RS485 serial line interface and computing machine, wherein: wireless signal receiver receives the signal that wireless signal transmitting device sends, this signal is transferred to ARM single-chip microcomputer by RS485 serial line interface and carries out data filtering and A/D conversion process, signal after process is transferred to by torque monitoring system RS485 serial line interface the conversion that computing machine carries out torque signal, analyzing and processing, and the change of torque signal in being shown Real Time Observation process on a display screen, set torque safety threshold value in addition, the security reporting to the police to remind staff's process is carried out when the torque signal value in process exceedes threshold value.In computing machine, the realization of correlation function can based on Virtual instrument LabVIEW Software Development Platform, LabVIEW possesses powerful, reliable signal handling capacity, be convenient to the feature studying, extract torque signal, voltage signal and current signal, meanwhile, LabVIEW also possesses stronger database manipulation function.
Preferably, described torque signal database comprises: database server and Database Systems Socket interface, wherein: database server stores electric current, voltage, torque signal and acquisition time in lathe numbering, tool sequence number, processing tasks, process, and be connected with torque signal supervisory system by Database Systems Socket interface, in order to electric current, voltage, torque signal and acquisition time in conveyor bed numbering, tool sequence number, processing tasks, process.
Compared with prior art, the present invention has following beneficial effect:
(1) wireless signal transmitting device installed power supply and be connected with strain gage testing electric bridge in card cover, and without relatively rotating between turning axle, avoid contact fatique wear problem, and the airtight resistance strain gage of card cover, protection circuit;
(2) use the transmission of wireless signals mode based on GPRS, avoid line length interference problem, make wireless signal receiver away from machining area, long transmission distance, transmission data rate is high;
(3) adopt long distance control system to monitor the change of torque signal in process in real time, achieve the condition managing to process, control and safe early warning.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the collection of torque signal of the present invention and the schematic diagram of radiating portion;
Fig. 2 is the schematic diagram of the remote monitoring part of torque signal of the present invention;
Fig. 3 is strain gage testing electric bridge.
In figure: 1-strain gage testing electric bridge; 2-handle of a knife assembly; 3-wireless signal transmitting device; 4-power supply; 5-card cover; 6,7-wire; 8-wireless signal receiver; 10-ARM single-chip microcomputer; 9,11-torque monitoring system RS485 serial line interface; 12-PC; 13-Database Systems Socket interface; 14-torque signal database.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
The present embodiment provides a kind of machine tool chief axis real-time moment of torsion wireless measuring system, comprises signals collecting and radiating portion and remote monitoring part.
As shown in Figure 1, described signals collecting and radiating portion comprise: be installed on the handle of a knife assembly 2 of machine tool chief axis, torque sensor and card cover 5, wherein: torque sensor adopts resistance-strain chip, and the full arm measure electric bridge 1 be made up of resistance strain gage is arranged on handle of a knife assembly 2; Card cover 5 is enclosed within handle of a knife assembly 2, and airtight resistance strain gage protection circuit.
In the present embodiment, resistance strain gage in the full arm measure electric bridge 1 of described composition adopts the form of strain bunch, and symmetry be pasted on turning axle, each strain bunch comprises orthogonal two panels foil gauge.
In the present embodiment, in described card cover 5, button cell power supply 4 and wireless signal transmitting device 3 are installed, wherein: wireless signal transmitting device 3 is connected by wire 7 with strain gage testing electric bridge 1, power supply 4 is connected by wire 6 with wireless signal transmitting device 3, and power supply 4 is powered for strain gage testing electric bridge 1 and wireless signal transmitting device 3.
In the present embodiment, described card cover 5 adopts loop configuration, is enclosed within handle of a knife assembly 2, airtight strain gage testing electric bridge 1, and rotates with handle of a knife assembly 2.Therefore, card cover 5 and strain gage testing electric bridge 1 are geo-stationary, and the signal of strain circuit collection can be connected to wireless signal transmitting device 3 by wire 7, and is transmitted to remote monitoring part by it.
As shown in Figure 2, described remote monitoring part comprises: wireless signal receiver 8 and computer processing system, wherein: wireless signal receiver 8 receives the signal launched by wireless signal transmitting device 3, and be transferred to computer processing system carry out data management and store display.
In the present embodiment, described computer processing system comprises: torque signal supervisory system and torque signal database 14.Because the collection of signal and the signal essence of radiating portion collection are voltage signals, have to pass through the change that certain conversion could reflect main-shaft torque in process, therefore, torque signal supervisory system is adopted to carry out filtering to the received signal, A/D changes, and according to the output voltage of strain gage testing electric bridge and resistance-strain, calculated relationship between resistance-strain and main-shaft torque is translated into torque value, and the change of torque signal in being shown Real Time Observation process on a display screen, set torque safety threshold value in addition, the security reporting to the police to remind staff's process is carried out when the torque signal in process exceedes threshold value, the electric current obtained will be monitored after process finishing, voltage, torque signal, the Signal transmissions such as acquisition time are to torque signal database 14, torque signal database 14 stores and upgrades the electric current of Real-Time Monitoring, voltage, torque signal.
In the present embodiment, described torque signal supervisory system comprises: ARM single-chip microcomputer 10, torque monitoring system RS485 serial line interface and PC (or industrial computer/portable machine) 12, wherein: wireless signal receiver 8 receives the signal that wireless signal transmitting device 3 sends, this signal is transferred to ARM single-chip microcomputer 10 by RS485 serial line interface 9 and carries out data filtering and A/D conversion process, signal after process is transferred to by torque monitoring system RS485 serial line interface 11 conversion that PC 12 carries out torque signal, analyzing and processing, and the change of torque signal in being shown Real Time Observation process on a display screen, set torque safety threshold value in addition, the security reporting to the police to remind staff's process is carried out when the torque signal value in process exceedes threshold value.In PC 12, the realization of correlation function can based on LabVIEW (virtual instrument) Software Development Platform, LabVIEW possesses powerful, reliable signal handling capacity, be convenient to the feature studying, extract torque signal, voltage signal and current signal, meanwhile, LabVIEW also possesses stronger database manipulation function.
In the present embodiment, the described computing method measuring main-shaft torque by resistance-strain chip measuring bridge are: when main shaft is subject to moment of torsion, be pasted onto the foil gauge generation deformation on axle thus cause its resistance value to change, the output voltage of measuring bridge becomes:
By the resistance of resistance wire
Can obtain:
In formula, R is resistance, and ρ is resistivity, and l is wire length, and S is resistance wire sectional area,
for axial deformation wiry (strain).If radial deformation is
Then
ε again
y=-μ ε
x,
very littlely can to ignore, then
V
out≈(1+2μ)εV
in
By generalized Hooke law σ=E ε/(1+ μ), in addition for handle of a knife, during handle of a knife transmitting torque, component position can be reduced to the tubular shaft of transmitting torque, its surperficial shear stress:
therefore
T in formula
nfor main-shaft torque, r is the distance of required stress point to cross-section centroid, and μ is the Poisson ratio of material, and D is the external diameter of tubular shaft, and d is the internal diameter of tubular shaft.
From analyzing above, torque T
nbe proportional to strain stress, and strain stress can be obtained by dR/R, therefore can obtain main-shaft torque T
n.
In the present embodiment, described torque signal database 14 comprises: database server and Database Systems Socket interface 13, wherein: database server stores electric current, voltage, torque signal and acquisition time in lathe numbering, tool sequence number, processing tasks, process, be connected with torque signal supervisory system by Database Systems Socket interface 13, in order to electric current, voltage, torque signal and acquisition time in conveyor bed numbering, tool sequence number, processing tasks, process.
The present invention adopts the real-time torque signal of wireless transmission method to process based on GPRS to detect, and utilizes computing machine to complete the remote monitoring of torque signal, achieves the condition managing to process and control.This invention solves the contact fatique wear problem of wire transmission, avoids line length interference, and makes wireless signal receiver away from machining area, easy to use, simple to operate, practical.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned specific embodiment, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (8)
1. the real-time moment of torsion wireless measuring system of machine tool chief axis, is characterized in that, comprises signals collecting and radiating portion and remote monitoring part;
Described signals collecting and radiating portion comprise: be installed on the handle of a knife assembly of machine tool chief axis, torque sensor and card cover, wherein: described torque sensor adopts resistance-strain chip, forms full arm measure electric bridge be arranged on handle of a knife assembly by resistance strain gage; The described card enclosure on handle of a knife assembly, for airtight resistance strain gage protection circuit;
Described remote monitoring part comprises: wireless signal receiver and computer processing system, wherein:
The signal that the collection of described wireless signal receiver Received signal strength and radiating portion send, and be transferred to computer processing system carry out data management and store display;
Described computer processing system comprises torque signal supervisory system and torque signal database, torque signal supervisory system carries out filtering to the received signal, A/D changes, and according to the output voltage of strain gage testing electric bridge and resistance-strain, calculated relationship between resistance-strain and main-shaft torque is translated into torque value, and the change of torque signal in showing Real Time Observation process on a display screen, set torque safety threshold value in addition, the security reporting to the police to remind staff's process is carried out when the torque signal in process exceedes threshold value, the electric current obtained will be monitored after process finishing, voltage, torque signal, acquisition time Signal transmissions is to torque signal database, described torque signal database purchase and real-time update monitoring electric current, voltage, torque signal.
2. the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis according to claim 1, is characterized in that, described torque sensor adopts resistance-strain chip, and foil gauge adopts strain bunch and on the symmetrical turning axle be pasted in handle of a knife assembly.
3. the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis according to claim 2, is characterized in that, described strain bunch comprises orthogonal two panels foil gauge.
4. the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis according to claim 1, is characterized in that, described card cover adopts loop configuration, is enclosed within handle of a knife assembly, and rotates with handle of a knife assembly.
5. the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis according to claim 4, it is characterized in that, described card cover is inner installs power supply and wireless signal transmitting device, wireless signal transmitting device is connected with strain gage testing electric bridge, and power supply is that strain gage testing electric bridge and wireless signal transmitting device are powered.
6. the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis according to claim 5, is characterized in that, described wireless signal transmitting device and wireless signal receiver adopt the transmission mode based on GPRS.
7. the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis according to claim 1, it is characterized in that, described torque signal supervisory system comprises: ARM single-chip microcomputer, torque monitoring system RS485 serial line interface and computing machine, wherein: wireless signal receiver receives the signal that wireless signal transmitting device sends, this signal is transferred to ARM single-chip microcomputer by RS485 serial line interface and carries out data filtering and A/D conversion process, signal after process is transferred to by torque monitoring system RS485 serial line interface the conversion that computing machine carries out torque signal, analyzing and processing, and the change of torque signal in being shown Real Time Observation process on a display screen, set torque safety threshold value in addition, the security reporting to the police to remind staff's process is carried out when the torque signal value in process exceedes threshold value.
8. the real-time moment of torsion wireless measuring system of a kind of machine tool chief axis according to any one of claim 1-7, it is characterized in that, described torque signal database comprises: database server and Database Systems Socket interface, wherein: database server stores lathe numbering, tool sequence number, processing tasks, electric current in process, voltage, torque signal and acquisition time, and be connected with torque signal supervisory system by Database Systems Socket interface, number in order to conveyor bed, tool sequence number, processing tasks, electric current in process, voltage, torque signal and acquisition time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410742581.6A CN104504877B (en) | 2014-12-05 | A kind of real-time moment of torsion wireless measuring system of machine tool chief axis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410742581.6A CN104504877B (en) | 2014-12-05 | A kind of real-time moment of torsion wireless measuring system of machine tool chief axis |
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| Publication Number | Publication Date |
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| CN104504877A true CN104504877A (en) | 2015-04-08 |
| CN104504877B CN104504877B (en) | 2018-02-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092193A (en) * | 2016-06-12 | 2016-11-09 | 上海航天设备制造总厂 | Wireless online mechanics and thermometry, device and application |
| CN107314842A (en) * | 2017-08-18 | 2017-11-03 | 北京强度环境研究所 | A kind of moment of flexure monitor and its data processing method |
| CN109341915A (en) * | 2018-12-19 | 2019-02-15 | 上海港复兴船务有限公司 | Craft tug shaft power monitors analysis system on-line |
| CN112362208A (en) * | 2020-11-11 | 2021-02-12 | 云南电网有限责任公司昆明供电局 | Torque measurement sensing alarm system and method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092193A (en) * | 2016-06-12 | 2016-11-09 | 上海航天设备制造总厂 | Wireless online mechanics and thermometry, device and application |
| CN107314842A (en) * | 2017-08-18 | 2017-11-03 | 北京强度环境研究所 | A kind of moment of flexure monitor and its data processing method |
| CN109341915A (en) * | 2018-12-19 | 2019-02-15 | 上海港复兴船务有限公司 | Craft tug shaft power monitors analysis system on-line |
| CN112362208A (en) * | 2020-11-11 | 2021-02-12 | 云南电网有限责任公司昆明供电局 | Torque measurement sensing alarm system and method thereof |
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