CN103469472A - Online detection device and detection method for knitting needles of knitting machine - Google Patents
Online detection device and detection method for knitting needles of knitting machine Download PDFInfo
- Publication number
- CN103469472A CN103469472A CN2013104189361A CN201310418936A CN103469472A CN 103469472 A CN103469472 A CN 103469472A CN 2013104189361 A CN2013104189361 A CN 2013104189361A CN 201310418936 A CN201310418936 A CN 201310418936A CN 103469472 A CN103469472 A CN 103469472A
- Authority
- CN
- China
- Prior art keywords
- knitting needle
- knitting
- signal
- output
- needle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009940 knitting Methods 0.000 title claims abstract description 240
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims description 16
- 230000000630 rising effect Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 230000007306 turnover Effects 0.000 claims description 10
- 244000309464 bull Species 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 230000004069 differentiation Effects 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 24
- 230000003321 amplification Effects 0.000 description 11
- 238000003199 nucleic acid amplification method Methods 0.000 description 11
- 239000004744 fabric Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Knitting Machines (AREA)
Abstract
The invention relates to an online detection device and detection method for knitting needles of a knitting machine. The device comprises a photoelectric sensing unit, a modulation-demodulation unit, a comparator, a microcomputer control unit and a position sensor. Damaged knitting needles including broken needles and crooked needles can be accurately detected, the knitting needles can be encoded, and the relative positions of the damaged knitting needles are positioned, so that the damaged knitting needles are conveniently and timely replaced by operators. The device has the advantages of long working distance, small size, low cost, high detection sensitivity, fine real-time performance and the like.
Description
Technical field
The present invention relates to knitting machine, particularly a kind of needle of needleloom on-line measuring device and detection method thereof.
Background technology
At present, in the knitting machine course of work, damaging often appears in knitting needle, as broken needle (syringe needle fractures and splits) or askew pin (lateral thrust), all can cause on fabric occurring flaw, cause the generation of fabric waste product, therefore, whether knitting needle is damaged to detect be very necessary.
Technology 1 " automatic defect checking device for knitting machine " (China Patent No. 90212451.X formerly, inventor Xu Yi sweet-smelling grass) in, it is while according to fabric, fault occurring, and its light transmission can produce significantly suddenlys change and has designed the fault automatic detection device consisted of comparison expression photoelectricity sensory perceptual system and differential operational amplification control circuit system etc.The light that this technology is sent by photophore is divided into two identical bundles through light path, the transmitted light that sees through grating and fabric is radiated on two photelectric receivers, while on fabric, fault occurring, the luminous intensity of transmitted light produces difference, and this equation of light xor signal is realized to circuit controls parking automatically through opto-electronic conversion and control circuit.The weak point of this method is: because fabric structure, fabric color and process conditions variation can cause the change of fabric light transmission, thereby reduce accuracy, and often because of erroneous judgement, cause frequent shutdown.
Formerly, in technology 2 " a kind of method and the device thereof of detection needle break of knitting frame " (China Patent No. 200610036411.1, the inventor relies naval), it is to adopt the mode that detects the yarn vibration to realize the detection to broken needle.This technology is by extracting the vibration signal before yarn enters knitting machine, and when broken needle occurring, yarn there will be vibration, and this vibration signal is converted to the stopping signal that knitting machine is shut down, and realizes the quality of real time automatic detection pin, and autostop is also reported to the police.The weak point of this method is: because yarn broken string or other extraneous factors (as inhomogeneous as the dials rotating speed) also can produce the yarn vibration, thereby cause erroneous judgement; In addition, the method can't be differentiated because the knitting needle lateral thrust causes fabric and the situation of fault occurs.
Summary of the invention
In order to overcome the formerly shortcoming of technology, the object of the present invention is to provide a kind of needle of needleloom on-line measuring device and detection method thereof.This device not only can accurately detect the knitting needle of damage, comprises broken needle, askew pin, and can be to knitting needle coding and the relative position of locating the knitting needle damaged, and with handled easily, personnel change in time; The advantage such as this device has the work distance, volume is little, cost is low, detection sensitivity is high and real-time performance is good.
The present invention is achieved by the following technical solutions:
A kind of needle of needleloom on-line measuring device, its characteristics are to be comprised of photoelectric sensing unit, modem module, comparator, microcomputer control unit and position sensor;
Described photoelectric sensing unit comprises emission light path and receiving light path, and described utilizing emitted light route illuminating source and cylindrical focusing mirror form; The light that illuminating source sends focuses on the knitting needle head surface through the cylindrical focusing mirror and becomes a focal line; Described receiving light path, be comprised of collimating mirror, optical filter, focus lamp and photelectric receiver successively in the reverberation direction of knitting needle head;
Described modem module comprises modulation circuit and demodulator circuit, comprises that described microcomputer control unit comprises microcontroller and display;
The irradiation that described photoelectric sensing unit sends is in the needle surface of knitting needle to be measured, knitting needle to be measured moves in a circle in the track of cylinder of knitting loom, cylinder of knitting loom is fixed on the knitting machine dials, the knitting machine bull stick is positioned at knitting machine dials below and rotates with knitting machine, knitting machine often circles, the knitting machine bull stick also circles, and described position sensor is arranged on the level dead ahead of knitting eedle bull stick, and the output of this position sensor is connected with an IO port of described microcontroller; The control end of the described modulation circuit of the first output termination of described microcontroller, the input of the described display of the second output termination of microcontroller, the DAC port of microcontroller connects the inverting input of comparator; The in-phase input end of described comparator is connected with the output of described demodulator circuit, the output of comparator is connected with the 2nd IO port of described microcontroller, the input of described demodulator circuit is connected with the output of described photelectric receiver, the output of demodulator circuit is connected with the ADC port of described microcontroller, the control end of the described illuminating source of output termination of described modulation circuit;
Described microcontroller is exported to modulation circuit by modulation signal, this modulation circuit drives illuminating source luminous, be radiated at the needle surface of knitting needle to be measured, the reverberation of the syringe needle of this knitting needle to be measured is successively through collimating mirror, optical filter, focus lamp, give described demodulator circuit by photelectric receiver reception output electrical signals, this demodulator circuit output knitting needle signal, the knitting needle signal outputs to the in-phase input end of described comparator, with the switching threshold of the DAC port output of the microcontroller of the inverting input of comparator relatively, output knitting needle pulse signal is to the 2nd IO port of microcontroller, the knitting needle signal also outputs to the ADC port of microcontroller, position sensor output signal is to an IO port of microcontroller, described microcomputerized controller is measured the knitting needle signal magnitude, with the configuration switch threshold value, the turnover signal of collection position sensor, counting pulse signal, so that knitting needle is encoded, the ranging pulse signal time, to differentiate knitting needle, whether damage, when the damage knitting needle being detected, the numbering of knitting needle is presented on display, control knitting machine shuts down simultaneously.
Described modulation circuit drives illuminating source luminous and light is modulated; Described demodulator circuit is comprised of pre-amplification circuit, bandwidth-limited circuit, amplifying circuit, peak-detector circuit, low-pass filter circuit successively, signal of telecommunication demodulation to described photelectric receiver output, output knitting needle signal, the light intensity magnitude of knitting needle signal reflection knitting needle head reflection;
By the switching threshold of the DAC port output of the knitting needle signal of described demodulator circuit output and described microcontroller relatively, output pulse signal, when pulse signal is high level, illustrate that knitting needle is not for damaging knitting needle to described comparator;
Described position sensor is in the knitting machine rotation process, and output turnover signal, with the position of initial knitting needle on pilot pin loom dials;
Described microcontroller output modulation signal is to modulation circuit; measure the knitting needle signal magnitude of described modulation circuit output; with the configuration switch threshold value; gather described position sensor the turnover signal, count the pulse signal of described comparator output, with to the knitting needle coding, measure described time pulse signal; to differentiate knitting needle, whether damage; when the damage knitting needle being detected, the numbering of damaging knitting needle is presented on display, control knitting machine simultaneously and shut down.
An angle is arranged between the optical axis of described emission light path and the optical axis of receiving light path, and the span of this angle is 35 °～55 °;
The position of the relative knitting needle in described photoelectric sensing unit can manual fine-tuning, make the thinnest sharp place of hot spot after the emission light path focuses on concentrate on the knitting needle head surface, thereby the signal of telecommunication of photelectric receiver output reaches maximum, improves and measures sensitivity.
Utilize the detection method of above-mentioned needle of needleloom on-line measuring device to knitting needle, the method comprises the following steps::
1. adjust light path, configuration switch threshold value: the syringe needle of the irradiation that the illuminating source of photoelectric sensing unit is sent any static knitting needle on cylinder of knitting loom, the position of fine setting photoelectric sensing unit, make the knitting needle signal of demodulator circuit output reach as far as possible maximum, microcontroller is measured the knitting needle signal, switching threshold is set as a percentage of this knitting needle signal, and exports to demodulator circuit by the DAC port of microcontroller;
2. collection signal: start knitting machine, the optical signal that described photelectric receiver receives the variation that knitting needle is reflected back is converted to the signal of telecommunication of respective change, after demodulator circuit is processed by the knitting needle output of pulse signal to microcontroller;
3. identification automatically: after described microcontroller reads the turnover signal and described knitting needle pulse signal of position sensor, start to count the transition times of described pulse signal rising edge, with to knitting needle coding, measure simultaneously and carry out interval time between every two adjacent pulse rising edges following differentiation:
When be greater than the twice of not damaging knitting needle interval time interval time, showing that fractureing appears in knitting needle herein splits, and determining fractures splits the position of the relatively initial knitting needle of knitting needle;
Be more than or equal to when not damaging a times of knitting needle interval time and being less than twice when interval time, show that lateral thrust appears in knitting needle herein, determine the position of the relatively initial knitting needle of crooked knitting needle;
4. when there being the knitting needle damaged, the position that described microcontroller will damage the relatively initial knitting needle of knitting needle shows on display, controls knitting machine simultaneously and shuts down.
With technology formerly, compare, the present invention has following advantage:
1. online detection, real-time is high.
The present invention adopts photoelectric sensor system based on the light reflection, the analog circuitry processes signal of response fast, can the Real-Time Monitoring knitting needle, accomplish online detection, and can avoid occurring flaw, thereby reduce the number of rejects and seconds rate.
2. the degree of accuracy is high, strong interference immunity.
The present invention modulates light source, separates the fundamental frequency signal that timing only extracts modulating frequency, to improve signal to noise ratio, simultaneously, has added optical filter in receiving light path, reduces the interference of extraneous other stray lights.
3. can identify perverted askew pin.
The present invention can not only identify broken needle, can also identify perverted askew pin, can avoid fabric fault to occur.
4. can locate bad pin position.
The present invention can calculate the position of damaging the relatively initial knitting needle of pin, thereby make the knitting machine operating personnel find fast the damage knitting needle not damaging the knitting needle coding when occurring damaging knitting needle, changes in time, raises the efficiency.
The accompanying drawing explanation
Fig. 1 is the structured flowchart of needle of needleloom on-line measuring device of the present invention and detection method thereof.
Fig. 2 is an embodiment circuit diagram of demodulator circuit of the present invention.
Fig. 3 is the present invention's demodulator circuit and comparator signal schematic diagram while detecting online not damaging knitting needle.
Fig. 4 is demodulator circuit and comparator signal schematic diagram when to be the present invention detect online to the fracture knitting needle.
Fig. 5 is demodulator circuit and comparator signal schematic diagram when to be the present invention detect online to the crooked knitting needle of side direction.
Fig. 6 is embodiment of the present invention demodulator circuit and the online testing result figure of comparator output signal.
The specific embodiment
Below in conjunction with drawings and Examples, the invention will be further described, but should not limit the scope of the invention with this.
First refer to Fig. 1, Fig. 1 is the structured flowchart of needle of needleloom on-line measuring device of the present invention.As seen from Figure 1, needle of needleloom on-line measuring device of the present invention mainly is comprised of photoelectric sensing unit 1, modem module 2, comparator 3, microcomputer control unit 4 and position sensor 5;
Described photoelectric sensing unit 1 comprises emission light path and receiving light path, and described utilizing emitted light route illuminating source 11 and cylindrical focusing mirror 12 form; The light that illuminating source 11 sends focuses on knitting needle head 6 surfaces through cylindrical focusing mirror 12 and becomes a focal line; Described receiving light path, be comprised of collimating mirror 13, optical filter 14, focus lamp 15 and photelectric receiver 16 successively in the reverberation direction of knitting needle head 6;
Described modem module 2 comprises modulation circuit 21 and demodulator circuit 22, comprises that described microcomputer control unit 4 comprises microcontroller 41 and display 42;
The irradiation that described photoelectric sensing unit 1 sends is in the needle surface of knitting needle 6 to be measured, knitting needle 6 to be measured moves in a circle in the track of cylinder of knitting loom 7, cylinder of knitting loom 7 is fixed on knitting machine dials 8, knitting machine bull stick 9 is positioned at knitting machine dials 8 belows and rotates with knitting machine, knitting machine often circles, knitting machine bull stick 9 also circles, described position sensor 5 is arranged on 2cm place, the level dead ahead of knitting eedle bull stick 9, and the output of this position sensor 5 is connected with an IO port of described microcontroller 41; The control end of the described modulation circuit 21 of the first output termination of described microcontroller 41, the input of the described display 42 of the second output termination of microcontroller 41, the DAC port of microcontroller 41 connects the inverting input of comparator 3; The in-phase input end of described comparator 3 is connected with the output of described demodulator circuit 22, the output of comparator 3 is connected with the 2nd IO port of described microcontroller 41, the input of described demodulator circuit 22 is connected with the output of described photelectric receiver 16, the output of demodulator circuit 22 is connected with the ADC port of described microcontroller 41, the control end of the described illuminating source 11 of output termination of described modulation circuit 21;
Described microcontroller 41 is exported to modulation circuit 21 by modulation signal, this modulation circuit 21 drives illuminating source 11 luminous, be radiated at the needle surface of knitting needle 6 to be measured, the reverberation of the syringe needle of this knitting needle 6 to be measured is successively through collimating mirror 13, optical filter 14, focus lamp 15, give described demodulator circuit 22 by photelectric receiver 16 receptions output electrical signals, these demodulator circuit 22 output knitting needle signals, the knitting needle signal outputs to the in-phase input end of described comparator 3, with the switching threshold of the DAC port output of the microcontroller 41 of the inverting input of comparator 3 relatively, output pulse signal, output of pulse signal is to the 2nd IO port of microcontroller 41, the knitting needle signal also outputs to the ADC port of microcontroller 41, position sensor 5 output signals are to an IO port of microcontroller 41, described microcomputerized controller 41 is measured the knitting needle signal magnitude, with the configuration switch threshold value, the turnover signal of collection position sensor 5, counting pulse signal, so that knitting needle is encoded, the ranging pulse signal time, to differentiate knitting needle, whether damage, when the damage pin being detected, the numbering of knitting needle is presented on display 32, control knitting machine shuts down simultaneously.
An angle is arranged between the optical axis of described emission light path and the optical axis of receiving light path, and the span of this angle is 35 °～55 °;
Refer to Fig. 2, Fig. 2 is an embodiment circuit diagram of demodulator circuit of the present invention.Described demodulator circuit 22 comprises a pre-amplification circuit 100, a bandwidth-limited circuit 101, an amplifying circuit 102, a peak-detector circuit 103, a low-pass filter circuit 104;
Described pre-amplification circuit 100 comprises an amplifier U1, a resistance R 1 and a capacitor C 1, as the input of described pre-amplification circuit 100, the output with the photelectric receiver 16 of described photoelectric sensing unit 1 connects, with described resistance R 1 one ends, connects, is connected with described capacitor C 1 one ends negative input end 2 pin of described amplifier U1, the positive input terminal 3 pin ground connection of described amplifier U1, output 6 pin of described amplifier U1 connect described resistance R 1 other end, connect described capacitor C 1 other end, connect the input of described bandwidth-limited circuit 101;
Described bandwidth-limited circuit 101 comprises an amplifier U2A, three resistance R 2, R3, R4 and two capacitor C 2, C3, described resistance R 2 one ends connect with output 6 pin of described amplifier U1, described resistance R 2 other ends connect with resistance R 3 one ends, described resistance R 3 other end ground connection, described capacitor C 2 one ends are connected with the tie point of resistance R 3 with described resistance R 2, described capacitor C 2 other ends connect with resistance R 4 one ends, described resistance R 4 other ends connect with capacitor C 3 one ends, described capacitor C 3 other ends are with described resistance R 2, tie point between resistance R 3 and capacitor C 2 is connected, negative input end 2 pin of described amplifier U2A are connected with the tie point of described capacitor C 3 with described resistance R 4, the positive input terminal 3 pin ground connection of described amplifier U2A, output 1 pin of described amplifier U2A is connected with the tie point of resistance R 4 with described capacitor C 4,
Described amplifying circuit 102 comprises an amplifier U2B, two resistance R 5, R6 and a capacitor C 4, described resistance R 5 one ends connect with output 1 pin of described amplifier U2A, described resistance R 5 other ends connect with negative input end 2 pin of amplifier U2B, described resistance R 6 one ends connect, connect with capacitor C 4 one ends with negative input end 2 pin of amplifier U2B, described resistance R 6 other ends connect with negative input end 1 pin of amplifier U2B,, connect the positive input terminal 3 pin ground connection of described amplifier U2B with capacitor C 47 other ends;
Described peak-detector circuit 103 comprises a diode D1, a capacitor C 5, a resistance R 7, described diode D1 anode connects with output 1 pin of described amplifier U2A, described diode D1 negative electrode connects, connects with resistance R 7 one ends with capacitor C 5 one ends, described capacitor C 5 other end ground connection, described resistance R 7 other end ground connection;
Described low-pass filter circuit 104 comprises an amplifier U3A, four resistance R 8, R9, R10, R11 and two capacitor C 6, C7, described resistance R 8 one ends connect with the negative electrode of described diode D1, described resistance R 8 other ends are connected with resistance R 9 one ends, described resistance R 9 other ends connect with capacitor C 7, described capacitor C 7 other end ground connection, described capacitor C 6 one ends are connected with the tie point of resistance R 9 with described resistance R 8, described capacitor C 6 other ends connect with resistance R 11, described resistance R 11 other ends connect with resistance R 10, described resistance R 10 other end ground connection, negative input end 2 pin of described amplifier U3A are connected with the tie point of resistance R 10 with described resistance R 11, positive input terminal 3 pin of described amplifier U3A are connected with the tie point of capacitor C 7 with described resistance R 9, output 1 pin of described amplifier U3A is connected with the tie point of resistance R 11 with described capacitor C 6, output 1 pin of described amplifier U3A is as the output of low-pass filter circuit 104, be connected to microcontroller ADC port,
The signal of telecommunication of photelectric receiver 16 outputs, input bandwidth-limited circuit 101 after pre-amplification circuit 100 amplifies, bandwidth-limited circuit 101 is narrow-band filtering, only allow the fundamental frequency of modulation signal to pass through, the sine wave that the fundamental frequency of modulation signal is frequency is take in output, peak-detector circuit 102 extracts the peak value of the sine wave after amplifying circuit 103 amplifies, level and smooth through low-pass filter circuit 104, output knitting needle signal; The knitting needle signal is connected to the ADC port of microcontroller 41, and the size of knitting needle signal has reflected the light intensity magnitude of knitting needle head surface reflection, and reverberation is stronger, and the knitting needle signal is larger, otherwise also anti-;
Described comparator 3 compares described knitting needle signal and switching threshold, output pulse signal; Described switching threshold is by the DAC port output of microcontroller 41; During knitting needle knitting needle head surface when the irradiation of photoelectric sensing unit 1 in not fracture, the knitting needle signal is greater than switching threshold, and pulse signal is high level; When the irradiation of photoelectric sensing unit 1, during on the knitting needle of fracture or without the knitting needle place, the knitting needle signal is less than switching threshold, and pulse signal is low level;
Refer to Fig. 3, Fig. 3 is the present invention at knitting machine at the uniform velocity in circular flow, for not damaging knitting needle, and the signal schematic representation of each circuit and comparator output in demodulator circuit.Reflected light signal inputs to pre-amplification circuit after being converted to the signal of telecommunication, and the output waveform of pre-amplification circuit is the identical but obvious impulse wave of changes in amplitude of dutycycle, when hot spot just in time is radiated at whole needle surface, and the signal amplitude maximum; The sine wave that bandwidth-limited circuit output is identical with the impulse wave frequency, changes in amplitude is similar; The peak-detector circuit output waveform is sinusoidal wave envelope waveform; The comparator output waveform is the corresponding impulse waveform of each root knitting needle;
Refer to Fig. 4, Fig. 4 is the present invention at knitting machine at the uniform velocity in circular flow, for the knitting needle of fracture, and the signal schematic representation of each circuit and comparator output in demodulator circuit.For the knitting needle of fracture, the pre-amplification circuit output waveform is that dutycycle is identical, amplitude is little and changes unconspicuous impulse wave; The sine wave that bandwidth-limited circuit output is identical with the impulse wave frequency, changes in amplitude is similar; The peak-detector circuit output waveform is sinusoidal wave envelope waveform; The comparator output waveform is a low level;
Refer to Fig. 5, Fig. 5 is the present invention at knitting machine at the uniform velocity in circular flow, for perverted knitting needle, and the signal schematic representation of each circuit and comparator output in demodulator circuit.For perverted knitting needle, the pre-amplification circuit output waveform is the identical and obvious impulse wave of changes in amplitude of dutycycle, when hot spot just in time is radiated at whole needle surface, and the signal amplitude maximum, but compared obvious delay with the impulse wave that does not damage knitting needle; The sine wave that bandwidth-limited circuit output is identical with the impulse wave frequency, changes in amplitude is similar; The peak-detector circuit output waveform is sinusoidal wave envelope waveform; The comparator output waveform is an impulse waveform postponed backward.Perverted knitting needle in this schematic diagram is for being an impulse waveform postponed backward to, comparator output waveform to the right, if perverted knitting needle for to the left to the time, the comparator output waveform is a leading impulse waveform forward;
Consult Fig. 3, Fig. 4, Fig. 5 can find out, knitting machine is at the uniform velocity in circular flow, do not damage in the knitting needle situation, interval time between every two adjacent rising edges of the pulse signal of comparator output is identical, when when not damaging the knitting needle that has a fracture between knitting needle for two, the interval time between two adjacent rising edges of pulse signal is not for damaging the knitting needle situation twice of lower interval time; When not damaging between knitting needle the knitting needle that has many fractures for two, can be greater than the interval time between two adjacent rising edges of pulse signal and not damage the knitting needle situation twice of lower interval time; When not damaging between knitting needle while having a perverted knitting needle at two, do not damaging between one times of interval time in the knitting needle situation and twice the interval time between two adjacent rising edges of pulse signal, when not damaging between knitting needle while having many perverted knitting needles at two, can only judge first perverted knitting needle;
Described position sensor 5 is in the knitting machine rotation process, and output turnover signal, with the position of initial knitting needle on pilot pin loom dials;
Described microcontroller 41 output modulation signals are to modulation circuit 21, measure the knitting needle signal magnitude of described modulation circuit 22 outputs, with the configuration switch threshold value, gather described position sensor 5 the turnover signal, catch the rising edge of the pulse signal of described comparator 3 outputs, counting rising edge transition times, with to the knitting needle coding, measure the interval time between every two adjacent rising edges simultaneously, whether occur fractureing with the differentiation knitting needle and split or lateral thrust.When the damage knitting needle being detected, the numbering of damaging knitting needle is presented on display 42, control knitting machine simultaneously and shut down.
This device detection method is as follows:
1. adjust light path, configuration switch threshold value: the syringe needle of the irradiation that the illuminating source of photoelectric sensing unit 1 is sent any static knitting needle on cylinder of knitting loom, the position of fine setting photoelectric sensing unit, make the knitting needle signal of demodulator circuit 22 outputs reach as far as possible maximum, 41 pairs of knitting needle signals of microcontroller are measured, switching threshold is set as a percentage of this knitting needle signal, and is exported by the DAC port of microcontroller;
2. collection signal: start knitting machine, the optical signal of the variation that described photelectric receiver 16 reception knitting needles are reflected back is converted to the signal of telecommunication of respective change, output knitting needle signal after demodulator circuit 22 is processed, the output of pulse signal that this knitting needle signal and described switching threshold are exported after relatively through comparator 3 is to microcontroller 41;
3. identification automatically: after described microcontroller 41 reads the turnover signal of position sensor 5, start to count the transition times of described pulse signal rising edge, with to knitting needle coding, measure simultaneously and carry out interval time between every two adjacent rising edges following differentiation:
When be more than or equal to the twice of not damaging knitting needle interval time interval time, showing that fractureing appears in knitting needle herein splits, and determining fractures splits the position of the relatively initial knitting needle of knitting needle;
Be greater than when not damaging a times of knitting needle interval time and being less than twice when interval time, show that lateral thrust appears in knitting needle herein, determine the position of the relatively initial knitting needle of crooked knitting needle;
4. when there being the knitting needle damaged, the position that described microcontroller 41 will damage the relatively initial knitting needle of pin shows on display 42, controls knitting machine simultaneously and shuts down.
Fig. 1 is the structural representation of most preferred embodiment of the present invention, and its concrete structure and statement parameter are as follows:
In the present embodiment photoelectric sensing unit, illuminating source is selected the LASER Light Source that peak wavelength is 670nm, power 10mW; The clear aperature of focus lamp 12 is Φ 7mm, the cylindrical mirror that working distance is 15.5mm; The focal line that LASER Light Source focuses on the knitting needle head surface after cylindrical mirror is of a size of 2mm * 30um; Collimating mirror 13 and focus lamp 15 are identical planoconvex lens; Photelectric receiver 16 is photodiode.
In modulation circuit, the pulse signal that modulation signal is frequency 50kHz, dutycycle 1:1, modulation circuit is used the Laser Driven module, and the driving chip is IC-HB.
In demodulator circuit, the amplifier model of pre-amplification circuit is OPA656, and the amplifier model of bandwidth-limited circuit and amplifying circuit is OPA2228, and the amplifier model of amplifying circuit is OPA2209.The centre frequency of bandwidth-limited circuit is 49.5kHz, and bandwidth is 1.07kHz, and quality factor are 45.55;
The comparable chip model of comparator is LM393, and switching threshold is made as adjusts after light path 50% of measured value when single needle is static.
In micro-control unit, microcontroller is STM32F103, and display is LM240120BFW.Position sensor is proximity Hall switch.
Utilize the knitting machine that described device is 28 pins/inch to plane No. to detect online under uniform rotation, its actual knitting needle signal and pulse signal are as shown in Figure 6.In Fig. 6, the output waveform that the knitting needle signal is demodulator circuit, each crest of this signal represents a knitting needle, and it is due in the knitting machine actual moving process that its peak value varies in size, and knitting needle exists small shake to cause; The output waveform that pulse signal is comparator, when the knitting needle of fracture occurring, a low level of corresponding position output, when askew pin occurring, the impulse waveform of a delay of corresponding position output.As shown in Figure 6, the present embodiment can accurately identify knitting needle and the perverted knitting needle of fracture, reaches the online purpose detected of knitting needle.
Claims (3)
1. a needle of needleloom on-line measuring device, is characterized in that being comprised of photoelectric sensing unit (1), modem module (2), comparator (3), microcomputer control unit (4) and position sensor (5);
Described photoelectric sensing unit (1) comprises emission light path and receiving light path, and described utilizing emitted light route illuminating source (11) and cylindrical focusing mirror (12) form; The light that illuminating source (11) sends focuses on knitting needle head (6) surface through cylindrical focusing mirror (12) and becomes a focal line; Described receiving light path, be comprised of collimating mirror (13), optical filter (14), focus lamp (15) and photelectric receiver (16) successively in the reverberation direction of knitting needle head (6);
Described modem module (2) comprises modulation circuit (21) and demodulator circuit (22), comprises that described microcomputer control unit (4) comprises microcontroller (41) and display (42);
The irradiation that described photoelectric sensing unit (1) sends is in the needle surface of knitting needle to be measured (6), knitting needle to be measured (6) moves in a circle in the track of cylinder of knitting loom (7), cylinder of knitting loom (7) is fixed on knitting machine dials (8), knitting machine bull stick (9) is positioned at knitting machine dials (8) below and rotates with knitting machine, knitting machine often circles, knitting machine bull stick (9) also circles, described position sensor (5) is arranged on 2cm place, the level dead ahead of knitting eedle bull stick (9), the output of this position sensor (5) is connected with an IO port of described microcontroller (41), the control end of the first output described modulation circuit of termination (21) of described microcontroller (41), the input of the second output described display of termination (42) of microcontroller (41), the DAC port of microcontroller (41) connects the inverting input of comparator (3), the in-phase input end of described comparator (3) is connected with the output of described demodulator circuit (22), the output of comparator (3) is connected with the 2nd IO port of described microcontroller (41), the input of described demodulator circuit (22) is connected with the output of described photelectric receiver (16), the output of demodulator circuit (22) is connected with the ADC port of described microcontroller (41), the control end of the described illuminating source of output termination (11) of described modulation circuit (21),
Described microcontroller (41) is exported to modulation circuit (21) by modulation signal, this modulation circuit (21) drives illuminating source (11) luminous, be radiated at the needle surface of knitting needle to be measured (6), the reverberation of the syringe needle of this knitting needle to be measured (6) is successively through collimating mirror (13), optical filter (14), focus lamp (15), give described demodulator circuit (22) by photelectric receiver (16) reception output electrical signals, this demodulator circuit (22) output knitting needle signal, the knitting needle signal outputs to the in-phase input end of described comparator (3), with the switching threshold of the DAC port output of the microcontroller (41) of the inverting input of comparator (3) relatively, output pulse signal, output of pulse signal is to the 2nd IO port of microcontroller (41), the knitting needle signal also outputs to the ADC port of microcontroller (41), position sensor (5) output signal is to an IO port of microcontroller (41), described microcomputerized controller (41) is measured the knitting needle signal magnitude, with the configuration switch threshold value, the turnover signal of collection position sensor (5), counting pulse signal, so that knitting needle is encoded, the ranging pulse signal time, to differentiate knitting needle, whether damage, when the damage pin being detected, the numbering of knitting needle is presented on display (32), control knitting machine shuts down simultaneously.
2. needle of needleloom on-line measuring device according to claim 1, is characterized in that, between the optical axis of the optical axis of described emission light path and receiving light path, an angle is arranged, and the span of this angle is 35 °～55 °.
3. utilize the detection method of needle of needleloom on-line measuring device claimed in claim 1 to knitting needle, it is characterized in that the method comprises the following steps:
1. adjust light path, configuration switch threshold value: the syringe needle of irradiation any static knitting needle on cylinder of knitting loom that the illuminating source of photoelectric sensing unit (1) is sent, the position of fine setting photoelectric sensing unit, make the knitting needle signal of demodulator circuit (22) output reach as far as possible maximum, microcontroller (41) is measured the knitting needle signal, switching threshold is set as a percentage of this knitting needle signal, and exports to demodulator circuit (22) by the DAC port of microcontroller;
2. collection signal: start knitting machine, the optical signal that described photelectric receiver (16) receives the variation that knitting needle is reflected back is converted to the signal of telecommunication of respective change, after demodulator circuit (22) is processed by the knitting needle output of pulse signal to microcontroller (41);
3. identification automatically: after described microcontroller (41) reads the turnover signal and described knitting needle pulse signal of position sensor (5), start to count the transition times of described pulse signal rising edge, with to knitting needle coding, measure simultaneously and carry out interval time between every two adjacent pulse rising edges following differentiation:
When be greater than the twice of not damaging knitting needle interval time interval time, showing that fractureing appears in knitting needle herein splits, and determining fractures splits the position of the relatively initial knitting needle of knitting needle;
Be more than or equal to when not damaging a times of knitting needle interval time and being less than twice when interval time, show that lateral thrust appears in knitting needle herein, determine the position of the relatively initial knitting needle of crooked knitting needle;
4. when there being the knitting needle damaged, described microcontroller (41) will damage the position of the relatively initial knitting needle of knitting needle in the upper demonstration of display (42), control knitting machine simultaneously and shut down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310418936.1A CN103469472B (en) | 2013-09-13 | 2013-09-13 | Needle of needleloom on-line measuring device and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310418936.1A CN103469472B (en) | 2013-09-13 | 2013-09-13 | Needle of needleloom on-line measuring device and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103469472A true CN103469472A (en) | 2013-12-25 |
| CN103469472B CN103469472B (en) | 2016-03-09 |
Family
ID=49794503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310418936.1A Expired - Fee Related CN103469472B (en) | 2013-09-13 | 2013-09-13 | Needle of needleloom on-line measuring device and detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103469472B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480627A (en) * | 2014-10-22 | 2015-04-01 | 常州市第八纺织机械有限公司 | Detection system of broken needle of weft-insert needle |
| CN104766383A (en) * | 2015-02-11 | 2015-07-08 | 四川蜀路通机电设备安装有限公司 | ETC recognition system based on low-pass filtering circuit |
| CN105092592A (en) * | 2015-08-27 | 2015-11-25 | 孔华 | Textile machine needle treatment device based on dual detection |
| CN105136809A (en) * | 2015-08-27 | 2015-12-09 | 任红霞 | Sewing needle appearance quality inspection method based on serial port communication |
| CN105136813A (en) * | 2015-08-27 | 2015-12-09 | 李红军 | Method for detecting whether weaving needles are qualified or not in batches |
| CN105181708A (en) * | 2015-08-27 | 2015-12-23 | 李红军 | Qualification detection platform of sewing needles in batches |
| CN106592093A (en) * | 2016-12-09 | 2017-04-26 | 广东华中科技大学工业技术研究院 | Control system and method for knitting missed stitches of a flat knitting machine on the basis of machine vision |
| CN108004673A (en) * | 2017-12-14 | 2018-05-08 | 苏州国盛云信息科技有限公司 | Automation dropped stitch for Computerized flat knitting machine detects warning device |
| CN108414519A (en) * | 2018-02-11 | 2018-08-17 | 常熟理工学院 | A kind of slide cam selector selects the detection device of needle position |
| CN109881356A (en) * | 2018-12-25 | 2019-06-14 | 西安工程大学 | Hosiery machine knitting needle on-line measuring device and method based on SVM image classification |
| CN109954209A (en) * | 2019-03-14 | 2019-07-02 | 北京京一合符医药科技发展有限公司 | A kind of high-voltage driving circuit system for functional electrostimulation |
| CN110284254A (en) * | 2019-07-05 | 2019-09-27 | 湖州中鹏纺织科技股份有限公司 | A kind of lever crochet hook device of the Computerized flat knitting machine with driving device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3529445A (en) * | 1968-04-08 | 1970-09-22 | Sick Erwin | Apparatus for controlling the operation of circular knitting machines |
| US3788105A (en) * | 1972-03-08 | 1974-01-29 | Sick Erwin Fa | Needle monitoring device for circular knitting machines |
| JPH03161558A (en) * | 1989-11-21 | 1991-07-11 | Okuma Mach Works Ltd | Monitor for number of needle pulses in circular knitting machine |
| CN201136948Y (en) * | 2007-12-13 | 2008-10-22 | 何峰 | Photoelectric induction alarming device of knitting large circular loom for needle breaking |
| CN101535545A (en) * | 2006-11-13 | 2009-09-16 | 蒙明格-埃罗有限公司 | Method and apparatus for needle monitoring |
| CN103225166A (en) * | 2013-04-23 | 2013-07-31 | 慈溪太阳洲纺织科技有限公司 | Cylindrical knitting machine and method for monitoring damage of knitting needles on cylindrical knitting machine |
-
2013
- 2013-09-13 CN CN201310418936.1A patent/CN103469472B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3529445A (en) * | 1968-04-08 | 1970-09-22 | Sick Erwin | Apparatus for controlling the operation of circular knitting machines |
| US3788105A (en) * | 1972-03-08 | 1974-01-29 | Sick Erwin Fa | Needle monitoring device for circular knitting machines |
| JPH03161558A (en) * | 1989-11-21 | 1991-07-11 | Okuma Mach Works Ltd | Monitor for number of needle pulses in circular knitting machine |
| CN101535545A (en) * | 2006-11-13 | 2009-09-16 | 蒙明格-埃罗有限公司 | Method and apparatus for needle monitoring |
| CN201136948Y (en) * | 2007-12-13 | 2008-10-22 | 何峰 | Photoelectric induction alarming device of knitting large circular loom for needle breaking |
| CN103225166A (en) * | 2013-04-23 | 2013-07-31 | 慈溪太阳洲纺织科技有限公司 | Cylindrical knitting machine and method for monitoring damage of knitting needles on cylindrical knitting machine |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480627A (en) * | 2014-10-22 | 2015-04-01 | 常州市第八纺织机械有限公司 | Detection system of broken needle of weft-insert needle |
| CN104766383A (en) * | 2015-02-11 | 2015-07-08 | 四川蜀路通机电设备安装有限公司 | ETC recognition system based on low-pass filtering circuit |
| CN105092592A (en) * | 2015-08-27 | 2015-11-25 | 孔华 | Textile machine needle treatment device based on dual detection |
| CN105136809A (en) * | 2015-08-27 | 2015-12-09 | 任红霞 | Sewing needle appearance quality inspection method based on serial port communication |
| CN105136813A (en) * | 2015-08-27 | 2015-12-09 | 李红军 | Method for detecting whether weaving needles are qualified or not in batches |
| CN105181708A (en) * | 2015-08-27 | 2015-12-23 | 李红军 | Qualification detection platform of sewing needles in batches |
| CN106592093A (en) * | 2016-12-09 | 2017-04-26 | 广东华中科技大学工业技术研究院 | Control system and method for knitting missed stitches of a flat knitting machine on the basis of machine vision |
| CN106592093B (en) * | 2016-12-09 | 2018-07-27 | 广东华中科技大学工业技术研究院 | A kind of control system and method for the cross machine knitting dropped stitch detection based on machine vision |
| CN108004673A (en) * | 2017-12-14 | 2018-05-08 | 苏州国盛云信息科技有限公司 | Automation dropped stitch for Computerized flat knitting machine detects warning device |
| CN108414519A (en) * | 2018-02-11 | 2018-08-17 | 常熟理工学院 | A kind of slide cam selector selects the detection device of needle position |
| CN109881356A (en) * | 2018-12-25 | 2019-06-14 | 西安工程大学 | Hosiery machine knitting needle on-line measuring device and method based on SVM image classification |
| CN109954209A (en) * | 2019-03-14 | 2019-07-02 | 北京京一合符医药科技发展有限公司 | A kind of high-voltage driving circuit system for functional electrostimulation |
| CN110284254A (en) * | 2019-07-05 | 2019-09-27 | 湖州中鹏纺织科技股份有限公司 | A kind of lever crochet hook device of the Computerized flat knitting machine with driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103469472B (en) | 2016-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103469472B (en) | Needle of needleloom on-line measuring device and detection method | |
| CN106248347B (en) | A kind of MEMS scanning mirror performance parameter measuring system and method | |
| US9927290B2 (en) | Arrangement and method for detecting and indicating laser radiation | |
| CN204594850U (en) | A kind of turbidity meter based on optical fiber | |
| CN104330386A (en) | Time division multiplexing-differential modulation laser driving device for detecting drunk driving | |
| CN104833624A (en) | Fiber-based turbidity measuring method and apparatus | |
| CN211296482U (en) | Centrifuge motor control system | |
| CN203719636U (en) | Inversion detecting device used for syringe needle | |
| CN103048251B (en) | OBS (optical back scattering) working state detector | |
| CN202329988U (en) | Optocoupler sensor testing device | |
| CN113726982A (en) | Photoelectric sensor capable of resisting high-frequency light interference | |
| CN104596970B (en) | Intermediate infrared laser gas sensing detecting device and intermediate infrared laser gas sensing detecting method | |
| CN102973259A (en) | Photoelectric heart rate measuring circuit | |
| CN111735790A (en) | Active infrared road icing detection system and detection method thereof | |
| CN110340552A (en) | For realizing the laser head of penetration-detection function | |
| CN107192715B (en) | Novel cigarette machine tipping paper connects detects device | |
| CN203561375U (en) | Reflective photoelectric sensing device | |
| CN205003099U (en) | Light reflex method detects detector of photovoltaic board cleanliness | |
| CN105241818A (en) | Photoelectric probe for oil monitoring on water surface | |
| CN201653386U (en) | Single-silk detection sensor | |
| CN202713257U (en) | Photoelectric switch with high reliability | |
| CN205880663U (en) | Intelligent handling vehicle | |
| CN203761351U (en) | Square wave signal extracting circuit | |
| CN207351545U (en) | Vibration signal extraction element based on gradual change transmitance filter | |
| CN110505011A (en) | Fiber failure detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160309 |