CN103469472B - Needle of needleloom on-line measuring device and detection method - Google Patents
Needle of needleloom on-line measuring device and detection method Download PDFInfo
- Publication number
- CN103469472B CN103469472B CN201310418936.1A CN201310418936A CN103469472B CN 103469472 B CN103469472 B CN 103469472B CN 201310418936 A CN201310418936 A CN 201310418936A CN 103469472 B CN103469472 B CN 103469472B
- Authority
- CN
- China
- Prior art keywords
- knitting needle
- signal
- knitting
- microcontroller
- 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.)
- Active
Links
Landscapes
- Knitting Machines (AREA)
Abstract
A kind of needle of needleloom on-line measuring device and detection method thereof.This device is made up of photoelectric sensing unit, modem module, comparator, microcomputer control unit and position sensor.The present invention accurately can not only detect the knitting needle of damage, comprises broken needle, askew pin, and can encode to knitting needle and locate the relative position of knitting needle damaged, and with handled easily, personnel change in time; The advantage such as this device has work distance, volume is little, cost is low, detection sensitivity is high and real-time performance is good.
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 flaw appears in fabric, cause the generation of fabric waste product, therefore, whether knitting needle is damaged to detect be very necessary.
At first technology 1 " automatic defect checking device for knitting machine " (China Patent No. 90212451.X, inventor Xu Yi sweet-smelling grass) in, it is when there is fault according to fabric, and its light transmission can produce significantly suddenlys change and devises the automatic defect inspection device be made up 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, transmitted light through grating and fabric is radiated on two photelectric receivers, when fabric there is fault, the luminous intensity of transmitted light produces difference, is automatically controlled to stop by this equation of light xor signal through opto-electronic conversion and control circuit realizing circuit.The weak point of this method is: because fabric structure, fabric color and process conditions change can cause the change of fabric light transmission, thus reduces accuracy, and often causes frequent shutdown because of erroneous judgement.
In first technology 2 " detecting a kind of method and the device thereof of needle break of knitting frame " (China Patent No. 200610036411.1, inventor relies naval), it is the detection that the mode adopting detection yarn to vibrate realizes to broken needle.This technology enters the vibration signal before knitting machine by extracting yarn, and when there is broken needle, yarn there will be vibration, and this vibration signal is converted to the stopping signal that knitting machine is shut down, realize the quality of real time automatic detection pin, autostop is also reported to the police.The weak point of this method is: because yarn broken string or other extraneous factors (as uneven in dials rotating speed) also can produce yarn vibration, thus cause erroneous judgement; In addition, the method cannot differentiate because knitting needle lateral thrust causes fabric to occur the situation of fault.
Summary of the invention
In order to overcome the shortcoming in first 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 accurately can not only detect the knitting needle of damage, comprises broken needle, askew pin, and can to the relative position of the knitting needle that knitting needle coding and location damage, and with handled easily, personnel change in time; The advantage such as this device has 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 feature is to be made up of photoelectric sensing unit, modem module, comparator, microcomputer control unit and position sensor;
Described photoelectric sensing unit comprises launches light path and receiving light path, described utilizing emitted light route illuminating source and cylindrical focusing mirror composition; The light that illuminating source sends focuses on knitting needle head surface through cylindrical focusing mirror and becomes a focal line; Described receiving light path, is made up 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 described microcomputer control unit and comprises microcontroller and display;
The light that described photoelectric sensing unit sends is radiated at 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 knitting machine dials, knitting machine bull stick is positioned at below knitting machine dials and rotates with knitting machine, knitting machine often circles, knitting machine bull stick also circles, and described position sensor is arranged on the knitting level dead ahead of eedle bull stick, and the output of this position sensor is connected with an IO port of described microcontroller; The control end of the modulation circuit of the first output described in termination of described microcontroller, the input of the display of the second output described in 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 illuminating source described in output termination of described modulation circuit;
Modulation signal is exported to modulation circuit by described microcontroller, 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, received by photelectric receiver and export the signal of telecommunication to described demodulator circuit, this demodulator circuit exports knitting needle signal, knitting needle signal outputs to the in-phase input end of described comparator, the switching threshold exported with the DAC port of the microcontroller of the inverting input of comparator compares, export the two IO port of knitting needle pulse signal to microcontroller, 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 measures knitting needle signal magnitude, with configuration switch threshold value, the turnover signal of collection position sensor, counting pulse signal, to encode to knitting needle, ranging pulse signal time, to differentiate whether knitting needle damages, when damage knitting needle being detected, by the display of the numbering of knitting needle over the display, control knitting machine to shut down simultaneously.
Described modulation circuit drives illuminating source luminous and modulates light; Described demodulator circuit is made up of pre-amplification circuit, bandwidth-limited circuit, amplifying circuit, peak-detector circuit, low-pass filter circuit successively, to the signal of telecommunication demodulation that described photelectric receiver exports, export knitting needle signal, the light intensity magnitude of knitting needle signal reflection knitting needle head reflection;
The switching threshold that the knitting needle signal that described demodulator circuit exports by described comparator and the DAC port of described microcontroller export compares, output pulse signal, when pulse signal is high level, illustrates that knitting needle is not for damage knitting needle;
Described position sensor, in knitting machine rotation process, exports turnover signal, with the position of initial knitting needle on pilot pin loom dials;
Described microcontroller exports modulation signal to modulation circuit; the knitting needle signal magnitude that modulation circuit described in measurement exports; with configuration switch threshold value; the pulse signal that the turnover signal of the position sensor described in collection, the comparator described in counting export, to encode to knitting needle, the time pulse signal described in measurement; to differentiate whether knitting needle damages; when damage knitting needle being detected, the numbering display that will damage knitting needle over the display, controls knitting machine simultaneously and shuts down.
Have an angle between the optical axis of described transmitting light path and the optical axis of receiving light path, the span of this angle is 35 ° ~ 55 °;
The position of the described relative knitting needle of photoelectric sensing unit can manual fine-tuning, make through launch light path focus on after the thinnest sharp place of hot spot concentrate on knitting needle head surface, thus the signal of telecommunication that photelectric receiver exports reaches maximum, improves measurement sensistivity.
Utilize above-mentioned needle of needleloom on-line measuring device to the detection method of knitting needle, the method comprises the following steps::
1. light path is adjusted, configuration switch threshold value: the syringe needle light that the illuminating source of photoelectric sensing unit sends being radiated at any static knitting needle in cylinder of knitting loom, the position of fine setting photoelectric sensing unit, the knitting needle signal that demodulator circuit is exported reaches maximum as far as possible, microcontroller is measured 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 change that knitting needle is reflected back is converted to the signal of telecommunication of respective change, after demodulator circuit process by knitting needle output of pulse signal to microcontroller;
3. automatically identify: after the turnover signal that described microcontroller reads position sensor and described knitting needle pulse signal, start the transition times of the pulse signal rising edge described in counting, to encode to knitting needle, carry out following differentiation the interval time of simultaneously measuring between every two adjacent pulse rising edges:
When being greater than the twice of not damaging knitting needle interval time interval time, showing that fractureing appears in knitting needle herein and splitting, determining to fracture and split the position of the relatively initial knitting needle of knitting needle;
When being more than or equal to a times of not damaging knitting needle interval time and being less than twice interval time, show that lateral thrust appears in knitting needle herein, determine the position of the relatively initial knitting needle of bending knitting needle;
4. when there is the knitting needle damaged, the position damaging the relatively initial knitting needle of knitting needle shows by described microcontroller over the display, controls knitting machine simultaneously and shuts down.
With compared with first technology, the present invention has following advantage:
1. on-line checkingi, real-time is high.
The present invention adopts the analog circuitry processes signal of photoelectric sensor system based on light reflection, fast response, can Real-Time Monitoring knitting needle, accomplishes on-line checkingi, can avoid occurring flaw, thus rate of reducing the number of rejects and seconds.
2. the degree of accuracy is high, strong interference immunity.
The present invention modulates light source, only extracts the fundamental frequency signal of modulating frequency during demodulation, to improve signal to noise ratio, meanwhile, in receiving light path, adds optical filter, reduces the interference of other stray lights extraneous.
3. can identify perverted askew pin.
The present invention can not only identify broken needle, can also identify perverted askew pin, and fabric can be avoided to occur fault.
4. can locate bad pin position.
The present invention to not damaging knitting needle coding, when occurring calculating the position damaging the relatively initial knitting needle of pin when damaging knitting needle, thus can make knitting machine operating personnel find damage knitting needle fast, changing in time, raising the efficiency.
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 to not damaging demodulator circuit and comparator signal schematic diagram when knitting needle carries out on-line checkingi.
Fig. 4 is demodulator circuit and comparator signal schematic diagram when to be the present invention carry out on-line checkingi to fracture knitting needle.
Fig. 5 is demodulator circuit and comparator signal schematic diagram when to be the present invention carry out on-line checkingi to lateral thrust knitting needle.
Fig. 6 is embodiment of the present invention demodulator circuit and comparator output signal on-line checkingi result figure.
Detailed description of the invention
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 forms primarily of photoelectric sensing unit 1, modem module 2, comparator 3, microcomputer control unit 4 and position sensor 5;
Described photoelectric sensing unit 1 comprises launches 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, is made up 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 described microcomputer control unit 4 and comprises microcontroller 41 and display 42;
The light that described photoelectric sensing unit 1 sends is radiated at 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 below knitting machine dials 8 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, knitting eedle bull stick 9 level dead ahead, and the output of this position sensor 5 is connected with an IO port of described microcontroller 41; The control end of the modulation circuit 21 of the first output described in termination of described microcontroller 41, the input of the display 42 of the second output described in 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 illuminating source 11 described in output termination of described modulation circuit 21;
Modulation signal is exported to modulation circuit 21 by described microcontroller 41, 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, received by photelectric receiver 16 and export the signal of telecommunication to described demodulator circuit 22, this demodulator circuit 22 exports knitting needle signal, knitting needle signal outputs to the in-phase input end of described comparator 3, the switching threshold exported with the DAC port of the microcontroller 41 of the inverting input of comparator 3 compares, output pulse signal, output of pulse signal is to the 2nd IO port of microcontroller 41, knitting needle signal also outputs to the ADC port of microcontroller 41, position sensor 5 outputs signal an IO port of microcontroller 41, described microcomputerized controller 41 measures knitting needle signal magnitude, with configuration switch threshold value, the turnover signal of collection position sensor 5, counting pulse signal, to encode to knitting needle, ranging pulse signal time, to differentiate whether knitting needle damages, when damage pin being detected, by the display of the numbering of knitting needle on the display 32, control knitting machine to shut down simultaneously.
Have an angle between the optical axis of described transmitting light path and the optical axis of receiving light path, 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 pre-amplification circuit 100, bandwidth-limited circuit 101, amplifying circuit 102, peak-detector circuit 103, low-pass filter circuit 104;
Described pre-amplification circuit 100 comprises an amplifier U1, a resistance R1 and an electric capacity C1, negative input end 2 pin of described amplifier U1 connects as the input of described pre-amplification circuit 100 with the output of the photelectric receiver 16 of described photoelectric sensing unit 1, connect with described resistance R1 one end, is connected with described electric capacity C1 one end, the positive input terminal 3 pin ground connection of described amplifier U1, output 6 pin of described amplifier U1 connects the described resistance R1 other end, connects the described electric capacity C1 other end, connects the input of described bandwidth-limited circuit 101;
Described bandwidth-limited circuit 101 comprises an amplifier U2A, three resistance R2, R3, R4 and two electric capacity C2, C3, described resistance R2 one end connects with output 6 pin of described amplifier U1, the described resistance R2 other end connects with resistance R3 one end, described resistance R3 other end ground connection, described electric capacity C2 one end is connected with the tie point of resistance R3 with described resistance R2, the described electric capacity C2 other end connects with resistance R4 one end, the described resistance R4 other end connects with electric capacity C3 one end, the described electric capacity C3 other end is with described resistance R2, tie point between resistance R3 and electric capacity C2 is connected, negative input end 2 pin of described amplifier U2A is connected with the tie point of described electric capacity C3 with described resistance R4, 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 R4 with described electric capacity C4,
Described amplifying circuit 102 comprises an amplifier U2B, two resistance R5, R6 and an electric capacity C4, described resistance R5 one end connects with output 1 pin of described amplifier U2A, the described resistance R5 other end connects with negative input end 2 pin of amplifier U2B, described resistance R6 one end connects with negative input end 2 pin of amplifier U2B, connects with electric capacity C4 one end, the described resistance R6 other end connects with negative input end 1 pin of amplifier U2B,, with the electric capacity C47 other end connect, the positive input terminal 3 pin ground connection of described amplifier U2B;
Described peak-detector circuit 103 comprises a diode D1, an electric capacity C5, a resistance R7, described diode D1 anode connects with output 1 pin of described amplifier U2A, described diode D1 negative electrode connects with electric capacity C5 one end, connects with resistance R7 one end, described electric capacity C5 other end ground connection, described resistance R7 other end ground connection;
Described low-pass filter circuit 104 comprises an amplifier U3A, four resistance R8, R9, R10, R11 and two electric capacity C6, C7, described resistance R8 one end connects with the negative electrode of described diode D1, the described resistance R8 other end is connected with resistance R9 one end, the described resistance R9 other end connects with electric capacity C7, described electric capacity C7 other end ground connection, described electric capacity C6 one end is connected with the tie point of resistance R9 with described resistance R8, the described electric capacity C6 other end connects with resistance R11, the described resistance R11 other end connects with resistance R10, described resistance R10 other end ground connection, negative input end 2 pin of described amplifier U3A is connected with the tie point of resistance R10 with described resistance R11, positive input terminal 3 pin of described amplifier U3A is connected with the tie point of electric capacity C7 with described resistance R9, output 1 pin of described amplifier U3A is connected with the tie point of resistance R11 with described electric capacity C6, 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 that photelectric receiver 16 exports, input tape bandpass filter circuit 101 after pre-amplification circuit 100 amplifies, bandwidth-limited circuit 101 is narrow-band filtering, the fundamental frequency of modulation signal is only allowed to pass through, export the sine wave being frequency with the fundamental frequency of modulation signal, 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, exports knitting needle signal; Knitting needle signal is connected to the ADC port of microcontroller 41, and the size of knitting needle signal reflects the light intensity magnitude of knitting needle head surface reflection, and reverberation is stronger, and knitting needle signal is larger, otherwise also anti-;
Described knitting needle signal compares with switching threshold by described comparator 3, output pulse signal; Described switching threshold is exported by the DAC port of microcontroller 41; When the light of photoelectric sensing unit 1 is radiated at the knitting needle knitting needle head surface of not rupturing, knitting needle signal is greater than switching threshold, and pulse signal is high level; When on the knitting needle that the light of photoelectric sensing unit 1 is radiated at fracture or without knitting needle place, knitting needle signal is less than switching threshold, and pulse signal is low level;
Refer to Fig. 3, Fig. 3 be the present invention in knitting machine at the uniform velocity circular flow, for not damaging knitting needle, the signal schematic representation that in demodulator circuit, each circuit and comparator export.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, and when hot spot is just in time radiated at whole needle surface, signal amplitude is maximum; Bandwidth-limited circuit exports the sine wave identical with impulse wave frequency, changes in amplitude is similar; Peak-detector circuit output waveform is sinusoidal wave envelope waveform; Comparator output waveform is the corresponding impulse waveform of each root knitting needle;
Refer to Fig. 4, Fig. 4 be the present invention in knitting machine at the uniform velocity circular flow, for the knitting needle of fracture, the signal schematic representation that in demodulator circuit, each circuit and comparator export.For the knitting needle of fracture, pre-amplification circuit output waveform is that dutycycle is identical, amplitude is little and changes unconspicuous impulse wave; Bandwidth-limited circuit exports the sine wave identical with impulse wave frequency, changes in amplitude is similar; Peak-detector circuit output waveform is sinusoidal wave envelope waveform; Comparator output waveform is a low level;
Refer to Fig. 5, Fig. 5 be the present invention in knitting machine at the uniform velocity circular flow, for perverted knitting needle, the signal schematic representation that in demodulator circuit, each circuit and comparator export.For perverted knitting needle, pre-amplification circuit output waveform is the identical and obvious impulse wave of changes in amplitude of dutycycle, and when hot spot is just in time radiated at whole needle surface, signal amplitude is maximum, but has obvious delay compared with the impulse wave not damaging knitting needle; Bandwidth-limited circuit exports the sine wave identical with impulse wave frequency, changes in amplitude is similar; Peak-detector circuit output waveform is sinusoidal wave envelope waveform; Comparator output waveform is an impulse waveform postponed backward.Perverted knitting needle in this schematic diagram be to the right to, comparator output waveform is an impulse waveform postponed backward, if perverted knitting needle be to the left to time, then comparator output waveform is an advanced forward impulse waveform;
Consult Fig. 3, Fig. 4, Fig. 5 can find out, knitting machine is at the uniform velocity in circular flow, under not damaging knitting needle situation, interval time between every two adjacent rising edges of the pulse signal that comparator exports is identical, when when not damaging the knitting needle that there is a fracture between knitting needle for two, the interval time between two adjacent rising edges of pulse signal is the twice of not damaging knitting needle situation lower interval time; When not damaging the knitting needle that there are many fractures between knitting needle for two, the interval time between two adjacent rising edges of pulse signal can be greater than the twice of not damaging knitting needle situation lower interval time; When not damaging an existence perverted knitting needle between knitting needle for two, interval time between two adjacent rising edges of pulse signal is not damaging between one times of interval time in knitting needle situation and twice, when two do not damage to there is many perverted knitting needles between knitting needle time, then can only judge first perverted knitting needle;
Described position sensor 5, in knitting machine rotation process, exports turnover signal, with the position of initial knitting needle on pilot pin loom dials;
Described microcontroller 41 exports modulation signal to modulation circuit 21, the knitting needle signal magnitude that modulation circuit 22 described in measurement exports, with configuration switch threshold value, the turnover signal of the position sensor 5 described in collection, catch the rising edge of the pulse signal that described comparator 3 exports, counting rising edge transition times, with to knitting needle coding, measure the interval time between every two adjacent rising edges simultaneously, split or lateral thrust to differentiate whether knitting needle occurs fractureing.When damage knitting needle being detected, the numbering display that will damage knitting needle on the display 42, controls knitting machine simultaneously and shuts down.
This device detection method is as follows:
1. light path is adjusted, configuration switch threshold value: the syringe needle light that the illuminating source of photoelectric sensing unit 1 sends being radiated at any static knitting needle in cylinder of knitting loom, the position of fine setting photoelectric sensing unit, the knitting needle signal that demodulator circuit 22 is exported reaches maximum as far as possible, microcontroller 41 pairs of knitting needle signals 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 that described photelectric receiver 16 receives the change that knitting needle is reflected back is converted to the signal of telecommunication of respective change, after demodulator circuit 22 processes, export knitting needle signal, the output of pulse signal that this knitting needle signal and described switching threshold export after comparator 3 compares is to microcontroller 41;
3. automatically identify: after described microcontroller 41 reads the turnover signal of position sensor 5, start the transition times of the pulse signal rising edge described in counting, to encode to knitting needle, carry out following differentiation the interval time of simultaneously measuring between every two adjacent rising edges:
When being more than or equal to the twice of not damaging knitting needle interval time interval time, showing that fractureing appears in knitting needle herein and splitting, determining to fracture and split the position of the relatively initial knitting needle of knitting needle;
When being greater than a times of not damaging knitting needle interval time and being less than twice interval time, show that lateral thrust appears in knitting needle herein, determine the position of the relatively initial knitting needle of bending knitting needle;
4. when there is the knitting needle damaged, the position damaging the relatively initial knitting needle of pin shows by described microcontroller 41 on the display 42, controls knitting machine simultaneously and shuts down.
Fig. 1 is the structural representation of most preferred embodiment of the present invention, its concrete structure and statement parameter as follows:
In the present embodiment photoelectric sensing unit, illuminating source selects peak wavelength to be the LASER Light Source of 670nm, power 10mW; The clear aperature of focus lamp 12 is Φ 7mm, and working distance is the cylindrical mirror of 15.5mm; The focal line that LASER Light Source focuses on 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, modulation signal is the pulse signal of frequency 50kHz, dutycycle 1:1, and modulation circuit uses Laser Driven module, and 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, switching threshold be set to adjust single needle after light path static time measured value 50%.
In micro-control unit, microcontroller is STM32F103, and display is LM240120BFW.Position sensor is proximity Hall switch.
Utilize described device to be that the knitting machine of 28 pins/inch carries out on-line checkingi under uniform rotation to plane No., its actual knitting needle signal and pulse signal are as shown in Figure 6.In Fig. 6, knitting needle signal is the output waveform of demodulator circuit, and each crest of this signal represents a knitting needle, and it is due in knitting machine actual moving process that its peak value varies in size, and knitting needle exists that small shake causes; Pulse signal is the output waveform of comparator, and when there is the knitting needle of fracture, corresponding position exports a low level, and when there is askew pin, corresponding position exports an impulse waveform postponed.As shown in Figure 6, the present embodiment accurately can identify the knitting needle of fracture and perverted knitting needle, reaches the object of knitting needle on-line checkingi.
Claims (3)
1. a needle of needleloom on-line measuring device, is characterized in that being made up of photoelectric sensing unit (1), modem module (2), comparator (3), microcomputer control unit (4) and position sensor (5);
Described photoelectric sensing unit (1) comprises launches light path and receiving light path, described utilizing emitted light route illuminating source (11) and cylindrical focusing mirror (12) composition; 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, is made up 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), and described microcomputer control unit (4) comprises microcontroller (41) and display (42);
The light that described photoelectric sensing unit (1) sends is radiated at the surface of knitting needle head (6), knitting needle head (6) moves in a circle with syringe 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, knitting machine bull stick (9) level dead ahead, the output of this position sensor (5) is connected with an I0 port of described microcontroller (41), the control end of the modulation circuit (21) of the first output described in termination of described microcontroller (41), the input of the display (42) of the second output described in 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 I0 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 illuminating source (11) described in output termination of described modulation circuit (21),
Modulation signal is exported to modulation circuit (21) by described microcontroller (41), this modulation circuit (21) drives illuminating source (11) luminous, be radiated at the surface of knitting needle head (6), the reverberation of this knitting needle head (6) is successively through collimating mirror (13), optical filter (14), focus lamp (15), received by photelectric receiver (16) and export the signal of telecommunication to described demodulator circuit (22), this demodulator circuit (22) exports knitting needle signal, knitting needle signal outputs to the in-phase input end of described comparator (3), the switching threshold exported with the DAC port of the microcontroller (41) of the inverting input of comparator (3) compares, output pulse signal, output of pulse signal is to the 2nd I0 port of microcontroller (41), knitting needle signal also outputs to the ADC port of microcontroller (41), position sensor (5) output signal is to an I0 port of microcontroller (41), knitting needle signal magnitude measured by described microcontroller (41), with configuration switch threshold value, the turnover signal of collection position sensor (5), counting pulse signal, to encode to knitting needle, ranging pulse signal time, to differentiate whether knitting needle damages, when damage pin being detected, the numbering of knitting needle is presented on display (42), control knitting machine to shut down simultaneously.
2. needle of needleloom on-line measuring device according to claim 1, is characterized in that there is an angle between the optical axis of described transmitting light path and the optical axis of receiving light path, and the span of this angle is 35 ° ~ 55 °.
3. utilize needle of needleloom on-line measuring device described in claim 1 to the detection method of knitting needle, it is characterized in that the method comprises the following steps:
1. light path is adjusted, configuration switch threshold value: the syringe needle light that the illuminating source of photoelectric sensing unit (1) sends being radiated at any static knitting needle in cylinder of knitting loom, the position of fine setting photoelectric sensing unit, the knitting needle signal that demodulator circuit (22) is exported reaches maximum as far as possible, microcontroller (41) is measured knitting needle signal, switching threshold is set as a percentage of this knitting needle signal, and is exported to the inverting input of comparator (3) by the DAC port of microcontroller;
2. collection signal: start knitting machine, the optical signal of the change that described photelectric receiver (16) reception knitting needle is reflected back is converted to the signal of telecommunication of respective change, after demodulator circuit (22) process, export knitting needle signal, the output of pulse signal that this knitting needle signal and described switching threshold export after comparator (3) compares is to microcontroller (41);
3. automatically identify: after the turnover signal that described microcontroller (41) reads position sensor (5) and described knitting needle pulse signal, start the transition times of the pulse signal rising edge described in counting, to encode to knitting needle, carry out following differentiation the interval time of simultaneously measuring between every two successive pulse signals rising edges:
When being greater than the twice of not damaging knitting needle interval time interval time, showing that fractureing appears in knitting needle herein and splitting, determining to fracture and split the position of the relatively initial knitting needle of knitting needle;
When being greater than a times of not damaging knitting needle interval time and being less than twice interval time, show that lateral thrust appears in knitting needle herein, determine the position of the relatively initial knitting needle of bending knitting needle;
4. when there is the knitting needle damaged, described microcontroller (41), by damaging the position of the relatively initial knitting needle of knitting needle in the upper display of display (42), controls knitting machine simultaneously and shuts 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 CN103469472A (en) | 2013-12-25 |
| CN103469472B true CN103469472B (en) | 2016-03-09 |
Family
ID=49794503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310418936.1A Active 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) |
Families Citing this family (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 |
| 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 |
| 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 |
| 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 |
| CN108004673B (en) * | 2017-12-14 | 2020-11-03 | 苏州国盛云信息科技有限公司 | Automatic missing stitch detection alarm device for computerized flat knitting machine |
| CN108414519B (en) * | 2018-02-11 | 2021-01-26 | 常熟理工学院 | Detection apparatus for select syringe needle position of needle ware |
| CN109881356B (en) * | 2018-12-25 | 2021-03-16 | 西安工程大学 | Hosiery machine knitting needle online detection device and method based on SVM image classification |
| CN109954209B (en) * | 2019-03-14 | 2020-07-31 | 北京京一合符医药科技发展有限公司 | High-voltage driving circuit system for functional electrical stimulation |
| 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 (5)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03161558A (en) * | 1989-11-21 | 1991-07-11 | Okuma Mach Works Ltd | Monitor for number of needle pulses in circular knitting machine |
-
2013
- 2013-09-13 CN CN201310418936.1A patent/CN103469472B/en active Active
Patent Citations (5)
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103469472A (en) | 2013-12-25 |
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 | |
| CN101738211B (en) | Device and method for measuring rotation angle of engine crankshaft | |
| CN104132693A (en) | Method for simultaneously extracting position and frequency of vibration signal in phase OTDR system | |
| US9927290B2 (en) | Arrangement and method for detecting and indicating laser radiation | |
| CN104833624A (en) | Fiber-based turbidity measuring method and apparatus | |
| CN103048251B (en) | OBS (optical back scattering) working state detector | |
| CN102445285A (en) | Peak searching method of Brillouin optical time domain reflectometer (BOTDR) system | |
| CN111735790A (en) | Active infrared road icing detection system and detection method thereof | |
| CN109532941B (en) | Non-contact detection method for pavement information of ballastless track of high-speed rail | |
| CN211296482U (en) | Centrifuge motor control system | |
| CN203630371U (en) | Test tube detection device | |
| CN110340552A (en) | For realizing the laser head of penetration-detection function | |
| CN203561375U (en) | Reflective photoelectric sensing device | |
| CN201653386U (en) | Single-silk detection sensor | |
| CN105241818A (en) | Photoelectric probe for oil monitoring on water surface | |
| CN209435224U (en) | A kind of electric power optical cable multi-path OTDR real time on-line monitoring device | |
| CN110505011A (en) | Fiber failure detection device | |
| CN203025066U (en) | Optical backscatter sensor (OBS) working state detector | |
| CN207351545U (en) | Vibration signal extraction element based on gradual change transmitance filter | |
| CN203443891U (en) | Spectrophotometry-based multi-channel and multi-component dye liquor concentration detection device | |
| CN205880663U (en) | Intelligent handling vehicle | |
| CN103528610A (en) | Reflective photoelectric sensing device | |
| CN214538151U (en) | Infrared pulse liquid level acquisition device applied to digital display specific surface area meter | |
| CN209858428U (en) | Novel laser methane sensor |
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 |