CN1065638C - Control method for laser measurement of tube thickness of picture tube - Google Patents

Abstract

The present invention is composed of a laser fixing frame table, a laser scanner, a laser controller and an operation box. Laser light generated by a semiconductor laser light generator in the laser scanner penetrates multiple mirror surfaces rotated by a motor to be transmitted; then, the laser light rays are dispersed and transmitted by a collimation lens; parts of laser light rays are shielded by a measured object; the rest of laser light rays penetrate an assembly lens in the receiving position to be assembled. Signals are collected by a light diode; square waves are converted into 'BI' and 'LO' signals via a waveform divider, and then are converted into the external diameter value of a hard tube to be displayed on the laser controller; signals generated by the laser controller are sent to the operation box to be compared with a control circuit. After a correction signal of a production line speed is obtained, the full line speed is controlled.

Description

The control method of laser determination tube thickness of picture tube

General traditional plastic cement hard tube is produced, adopt injector constant speed production completely, raw material melts the stream instability in mould internal cause heat, often cause finished product thickness that mean difference is up and down arranged, not only the thickness of pipe of Sheng Chaning can't be consistent, and cause that the raw material consumption is invisible to be expended, in view of this problems affect is to managing competitive power, and production firm thinks to set about seeking to improve countermeasure by the control thickness of pipe is consistent for this reason; Present known tube thickness of picture tube mensuration mode has contact and contactless two classes, and wherein the contact type has following a kind ofly, now its functional characteristic is described as follows:

Linear adjustable differential transformer (LVDT) control system of known extrusion type; As shown in Figure 1, linear adjustable differential transformer is directly pushed by the hard tube tube wall by this system, produce industrial trace change signal, handle the final value that obtains through converter again, get this value and make totalizer with base speed signal completely and relatively revise, finally obtain revised all fronts speed of production signal, carry out the line speed lifting change control thickness of pipe, this control system controlling party block diagram as shown in Figure 1, its motion flow is described as follows:

Detect gauge head 12 by the adjustable differential transformer of linearity and obtain hard tube 11 calibers change signal, be converted to 4～20mA thickness signal A through ratio, integration, differential (PID) controller 13, again by adjustable ratio amplification converter 14, with this conversion of signals is 0～10V thickness signal B, after this signal is handled by totalizer 17 with all fronts base speed signal C, obtain 0～10V speed of production signal E completely, revise speed of production completely, with control hard tube caliber thickness; Also can directly pass through totalizer 17 by manual speed signal D with all fronts base speed signal C and handle, acquisition 0～10V is speed of production signal E completely, but the manual control of employing all fronts speed of production, uncontrollable thickness of pipe unanimity.

[remarks: the input signal of totalizer 17 wherein is by one group of variable resistor, 15 reference potential C signals, with from automatic signal B or manually variable resistor 16 reference potential D signals form, below be its signal association each other ^*Manual time=E=D+C; ^*E=B+C when thunder is automatic.C is all fronts base speed reference signals; D is the manual speed signal]

Known extrusion type is linear adjustable, and the control of differential transformer thickness measuring still has following defective in the use:

(1) mechanism install to be difficult for, overhaul adjust loaded down with trivial details time-consuming.

(2) be directly to push, produce the moving signal of industrial quantitative change, so the not anti-external force collision compressing of its mechanism by the hard tube tube wall.

(3) by the direct extruding mechanism structure of hard tube obtaining the change signal, its physical construction has the short shortcoming of operating life along with the skew of caliber thickness, and the easy degradation failure of mechanism.

(4) pressure liftable mechanism need be installed at the scene, in order to the operation of on-the-spot injector die change, pneumatic circuit is horizontal upright, causes die change operation inconvenience.

(5) though investment cost is cheap, because of the part number of fitting parts is many, back maintenance in unfavorable day.

Contactless type has following two kinds:

(A) known rotary ultrasonic thickness control system: as shown in Figure 2, this system detects gauge head by mechanism with ultrasonic thickness to place on the hard tube tube wall and (do not contact), drives via the motor rotation and detects gauge head along rotating back and forth measurement on 360 ° of tube walls of hard tube circumference; Divide according to the automatic die heated zones, hard tube is measured circumference be divided into equal section relatively, obtain the industrial trace change of each section signal respectively, handle the final value that obtains through converter again, corresponding heated zones is produced temperature signal and is made the totalizer numeric ratio on this magnitude signal and the original mould, with instant each section well heater of back coupling temperature of reaction signal controlling, reaches the demand of thickness of pipe control, this control system controlling party block diagram as shown in Figure 2, its motion flow is described as follows:

Detect gauge head 22 by ultrasonic and obtain each section caliber change signal of hard tube 21 circumference, be converted to 0～10V thickness signal A by ultrasonic gage controller 23, change current converter 24 by voltage again and be converted into 4～20mA thickness signal B, with this undressed fluctuation thickness signal, passing ratio, integration, derivative controller 25 is handled, obtain 4～20mA constant thickness signal C, via totalizer 28 with this signal with take from each section temperature detector thermopair 26 and change current converter 274～20mA temperature feedback signal D addition relatively through voltage, obtain 4～20mA temperature corrected signal E, by each zone temperatures controller 29, obtain the revised temperature of 4～20mA and produce signal F, and then feedback control each section well heater, revise each section heter temperature increase and decrease, with the control tube thickness of picture tube.Known rotary ultrasonic thickness measuring is controlled the following defective of tool in the use:

(1) mechanism install to be difficult for, overhaul adjust loaded down with trivial details time-consuming.

(2) detecting gauge head is through the motor driven rotary, and motor circles round and expends the energy, and thereby increase fault chance.

(3) this type of mechanism for measuring thick needs to be used with the automatic die firing equipment, and because of employing 4,6,8 or the more multi-region section design usually of automatic die firing equipment, invisible energy consumption and tangible equipment investment expense increase, and are its imperfection part.

(4) use the ultrasonic thickness measuring need lean on water or liquid to be media, can obtain caliber or tube wall thickness signal, cause the on-the-spot increase auxiliary device that needs to be its defective.

(B) the known rotary reflective measurement thickness control system of agate r that adds: as shown in Figure 3, this system is according to " Kang Pu gulps down effect ", utilize radioactive isotope, launch when adding the lower material of agate r ray or photon strikes atomic number, be proportional to the quality of materials (or weight per unit area) of its front by the photon amount, and then detect instrument and other electronic components are converted into engineering unit with photon by flicker; This system will add the reflective gauge head unit that detects of agate r by mechanism too and (not contact) on the hard tube tube wall, drive via the motor rotation and detect gauge head along rotating back and forth measurement on 360 ° of tube walls of hard tube circumference; Divide according to the automatic die heated zones, hard tube is measured circumference be divided into equal section relatively, obtain the industrial trace change of each section signal respectively, handle the final value that obtains through converter again, again with original mould on corresponding heated zones produce temperature signal and make the totalizer numeric ratio, with instant each section well heater of back coupling temperature of reaction signal controlling, reach the demand of thickness of pipe control, this control system controlling party block diagram as shown in Figure 3, its motion flow is described as follows:

Obtain each section caliber change signal of hard tube 31 circumference by adding the reflective gauge head 32 that detects of agate r, be converted to 0～10 thickness signal A by adding the reflective gage controller 33 of agate, change current converter 34 by voltage again and transfer signal to 4～20mA thickness signal B, with this undressed fluctuation signal passing ratio, integration, derivative controller 35 is handled, obtain 4～20mA constant thickness signal C, via totalizer 38 with this signal with take from each section temperature detector thermopair 36, change current converter 374～20mA temperature feedback signal D through voltage and make addition relatively, produce 4～20mA temperature corrected signal E, obtain revised 4～20mA by each zone temperatures controller 39 and produce temperature signal F, and then feedback control each section well heater, revise each section heter temperature increase and decrease, with the control tube thickness of picture tube.Known rotary adding, have following defective in the reflective measurement thickness control system use of agate r:

(1) add agate r ray and belong to radiativity dosage ray, how much influential to human body, though radiativity dosage is few,, health still is not suitable for because be exposed to this operating environment all the year round.

(2) the rotary agate r thickness measurement with ray that adds is through the motor driven rotary, and motor circles round and expends the energy and therefore increase the fault chance.

(3) the rotary agate r thickness measurement with ray mechanism that adds needs to be used with the automatic die firing equipment, and employing 4,6,8 or the more multi-region section design usually of automatic die firing equipment, invisible energy consumption and tangible equipment investment expense increase, and are its imperfection part.

Via above analysis explanation as can be known, present known thickness measurement technology has remained many defectives, for getting rid of above-mentioned drawback, the inventor studies intensively discussion, invent out the control method of this cover laser determination tube thickness of picture tube, use to improve and use defective at present, and on production line, control the thickness of pipe, obtain quite good thickness of pipe control effect via practice.

The object of the present invention is to provide a kind of control method of laser determination tube thickness of picture tube, it is contactless making its thickness measurement with laser, and mechanism installs easily, overhauls easy to adjust; The measuring range broadness, big small-bore hard tube all can measure.

The objective of the invention is to realize by following technical scheme.

1. the control method of a laser determination tube thickness of picture tube, it is characterized in that it is a semiconductor laser generator in the laser scanning device that utilizes in the laser control system, the laser that generates is launched by the multiple minute surface of motor rotation, via finder lens laser beam is dispersed ejaculation again, partly laser beam can be blocked by measured object, remaining laser beam is then in reception place, by convergent lens with light-ray condensing, via optical diode with signal collection, after the waveform dispenser square wave is converted to " HI " and reaches " LO " signal, get this " HI " and reach " LO " signal-count value, converting hard tube external diameter value to is shown on the laser controller, and with the signal that produces deliver in the control box with control circuit relatively, obtain the corrected signal of producing linear speed, carry out all fronts speed control;

Again laser controller caliber setting value and the actual value that obtains through the laser scanning device are made comparisons, get its deviate, with this deviate passing ratio, integration, differential switching controller, this value is done the addition correction with the main frame rate signal again, drive the speed of feeding machine speed, to reach control tube thickness of picture tube function;

The laser scanning device is installed in the laser fixed stand mechanism, the quantity-produced hard tube is through between this laser scanning device, by the transmitter emission laser beam, after being subjected to producing hard tube continuously and blocking, receive the laser beam surplus, get industrial trace change signal after converter is handled at the receiver place, the final value that obtains, this signal is made totalizer relatively with all fronts speed of production signal again, obtains speed of production signal completely, to carry out the line speed lifting change control thickness of pipe;

Obtain hard tube caliber change signal by the laser scanning device, be converted to thickness signal through laser controller, change current converter by voltage again and transfer signal to thickness signal, undressed fluctuation signal passing ratio, integration, the processing of differential switching controller obtain thickness signal, change electric pressure converter via electric current again and be converted to thickness signal, through speed of production signal correction all fronts, all fronts speed of production that totalizer is handled, and then the control tube thickness of picture tube;

Stop and the speed adjustment but start, and can directly learn the hard tube caliber that desire measures, and can select manually and automatic function, select whether desire is made thickness measuring is controlled through panel by the laser controller on the guidance panel by control box device direct control feeding machine.

The employed equipment of a kind of control method of laser determination tube thickness of picture tube is characterized in that it mainly is made up of one group of laser control system, one group of laser fixed stand mechanism and one group of control box device; Wherein:

This laser control system is made up of laser controller, laser scanning device, ratio, integration, derivative controller, totalizer and speed setting variohm;

This laser fixed stand mechanism is made up of main backstop, pallet lifting handwheel, the first turning axle latch mechanism, elevating and locking mechanism, the second turning axle latch mechanism, laser scanning device, laser scanning device fixing support rack; It is located at the injector mould discharging and sentences and reach the instant back coupling control thickness of pipe, this is to adopt the shaft type design, vacuum tank transmission side that its migration space is bigger when die change, desire moves into the measurement space of mould rear side again when measuring, wherein fixing the adjustment is at first to adjust pallet lifting handwheel to producing height, by elevating and locking mechanism, with its lifting stationary positioned, via the first turning axle latch mechanism, the thickness measuring direction is fixed, by the second turning axle latch mechanism,, so can record the measured object external diameter again by the laser scanning device with laser scanning device fixing support rack skew stationary positioned;

This control box device is by the pilot lamp group, the feeding machine tachometer gage, the feeding machine reometer, laser controller, ratio, integration, derivative controller, manual selector switch, feeding machine start button switch, feeding machine stop button switch, set data keeps the ON/OFF selector switch, feeding machine speed is adjusted element compositions such as knob, by easy operating and setting, but the direct control feeding machine starts and stops and the speed adjustment, and can directly learn the hard tube caliber that desire measures by the laser controller on the guidance panel, and can select manually or automatic function through panel, select whether desire is done thickness measuring control.

The present invention compared with prior art has obvious advantage and good effect.

(1) thickness measurement with laser is contactless, and no mechanical type has the operating life shortcoming, and mechanism installs easily, overhauls easy to adjust.

(2) thickness measurement with laser can directly show the measured object external diameter, and measurement accuracy reaches ± 5 μ, and can be by pc connection with continuous means of production record or print.

(3) measuring range broadness, big small-bore hard tube all can measure, and it is easy that mechanism adopts modularity to set up demolition and maintenance, and cost of investment is cheap, and it is good to measure the control effect.

Concrete structure of the present invention is provided in detail by following examples and accompanying drawing thereof.

Fig. 1 is that linear displacement detects transformer control system process flow diagram.

Fig. 2 is rotary ultrasonic thickness control system process flow diagram.

Fig. 3 is the rotary reflective measurement thickness control system of the agate r process flow diagram that adds.

Fig. 4 is the control system process flow diagram of laser determination thickness of the present invention.

Fig. 5 is a laser determination THICKNESS CONTROL block diagram of the present invention.

Fig. 6 is laser fixed stand mechanism and laser scanning device synoptic diagram.

Fig. 7 is the control box vertical view of control box device of the present invention.

Fig. 8 is the 7B control box front elevation of control box device of the present invention.

Fig. 9 is the 7C control box side view of control box device of the present invention.

Figure 10 is by thickness measurement with laser control and the hard tube weight distribution curve figure that controls without thickness measuring.

(A) control principle explanation of the present invention:

(1) hard tube thickness measurement with laser control system, be to utilize semiconductor laser photogenerator in the laser scanning device, the laser light that generates is launched by the multiple minute surface of motor rotation, via finder lens laser beam is dispersed ejaculation again, partly laser beam can be blocked by measured object (hard tube), remaining laser beam is then in reception place, by convergent lens with light-ray condensing, via optical diode with signal collection, after the waveform dispenser square wave is converted to " HI " and reaches " LO " signal (" 0 " reaches " 1 "), get this " HI " and reach " LO " signal-count value, converting hard tube external diameter value to is shown on the laser controller, and with the signal of its generation deliver in the control box with control circuit relatively, obtain the corrected signal of producing linear speed, carry out all fronts speed control.

(2) laser controller caliber setting value (S.V) is made comparisons with the actual value (P.V) that obtains through the laser scanning device, get its deviate (D.V), with this deviate passing ratio integral differential switching controller (P.I.D), this value is done the addition correction with the main frame rate signal again, drive feeding machine speed speed, to reach control tube thickness of picture tube function.

(B) control method technology contents explanation of the present invention:

This system is mounted thereon head (level installation) by laser fixed stand mechanism with the laser scanning device, the quantity-produced hard tube is through between this laser scanning device (containing transmitter and receiver), by the transmitter emission laser beam, after being subjected to producing hard tube continuously and blocking, receive the laser beam surplus in the receiver place, get this industrial trace change signal after converter is handled, the final value that obtains, this signal is made totalizer relatively with all fronts speed of production signal again, obtain speed of production signal completely, carrying out the line speed lifting change control thickness of pipe, this control system controlling party block diagram as shown in Figure 4, its motion flow is described as follows:

Obtain hard tube 41 calibers change signal by laser scanning device 42, be converted to ± 10V thickness signal A through laser controller 43, change current converter 44 by voltage again and transfer signal to 4～20mA thickness signal B, this undressed fluctuation signal passing ratio, integration, differential, controller 45 processing obtain 4～20mA thickness signal C, change electric pressure converter 46 via electric current again and be converted to 0～10V thickness signal D, revise speed of production completely through 0～10V all fronts speed of production signal G that totalizer 49 is handled, and then the control tube thickness of picture tube.

Wherein the input signal of totalizer 49 is by one group of variable resistor, 47 reference potential E signals, with from automatic signal D or manually variable resistor 48 reference potential F signals form, below correlate each other for its signal ^*G=F+E when manual; ^*G=D+E when automatic.E is all fronts base speed reference signals; F is the manual speed signal.

(C) each device assembly explanation of the present invention:

(1) the laser control system block diagram as shown in Figure 5, the control of this figure is by laser scanning device emission part 52 internal semiconductor laser light generators, the laser light that generates is launched by the multiple minute surface of motor rotation, by finder lens laser beam is dispersed ejaculation again, after measured object (hard tube) 51 blocks, the residue laser beam in laser scanning device receiving portion 53 convergent lens with light-ray condensing, via optical diode with signal collection, after the waveform dispenser square wave is converted to " HI " and reaches " LO " signal (" 0 " reaches " 1 "), get its " HI " and reach " LO " signal-count value, converting hard tube external diameter value to is shown on the laser controller 54, and with its generation ± the 10V signal delivers to conversion totalizer 55 and ratio, integration, derivative controller 56 and 0～10V base speed signal A completely compare, obtain the corrected signal B of line speed, carry out all fronts speed control, with the control tube thickness of picture tube.

(2) laser fixed stand mechanism as shown in Figure 6, this mechanism is because of considering near-lying mode head mould tool place, thickness measuring installation site, in view of production specification because of the scheduling demand, often need more mold exchange, so mechanism design is become the two-part rotating mechanism, operation inconvenience when avoiding die change is described as follows its mode of operation now:

Laser fixed stand main backstop 61, use stretching screw to be fixed on the ground, row is adjusted pallet lifting handwheel 62 to producing height again, by elevating and locking mechanism 64, with its height stationary positioned, by the first turning axle latch mechanism 63, the thickness measuring direction is fixed again, pass through the second turning axle latch mechanism 65 again with laser scanning device fixing support rack 68 offset direction stationary positioned, so can record measured object (hard tube) 67 thickness of pipe by laser scanning device 66.

(3) operation casing such as Fig. 7, Fig. 8, shown in Figure 9, this operation casing is installed on by the laser fixed stand, after the adjustment of laser fixed stand is finished, at first select manual selector switch 76 in manual mode by operation casing vertical view (Fig. 7) top panel, can show the manual activity pattern by pilot lamp group 71, depress feeding machine start button switch 77, start the feeding machine running, by feeding machine tachometer gage 72, can learn present line speed, adjust knob 7A by feeding machine speed, line speed raising speed or reduction of speed can be changed,, the load state of present production equipment can be learnt by feeding machine reometer 73, the feeding machine running also can stop the feeding machine in the running via depressing feeding machine stop button switch 78; Then the production caliber data of setting laser controller 74 and ratio, integration, derivative controller 75 are measured classification, can be by selecting manual selector switch 76 in automatic mode, promptly enter and measure thickness of pipe control operation, in producing if during the desire change means of production, can keep ON/OFF selector switch 79 in the ON pattern through selecting set data, can revise the means of production, and the previous means of production of setting can not change, treat to keep ON/OFF selector switch 79 to select pattern set data, new set data can be changed old data in OFF.

(D) thickness of pipe control practice benefit of the present invention:

(1) practice thickness measurement with laser control system, in test 2 " (52mmE) type hard tube; the test effect still can (standard of tolerance reaches 0.167%); (manually) standard of tolerance is 0.293% when control without thickness measurement with laser; after studying by analysis; determine not good the causing of the working condition degree of stability of board own, this injects board, and to record the gear case vibration values in production be MAX:1.2mm/sec; The motor vibrations value is MAX:6.7mm/sec, and the vibration values of its production is excessive, causes the hard tube that goes out via mold injects also following and vibrates, so standard of tolerance only can reach 0.167%.

(2) arrange in addition test 2 " (50mm) W hard tube; test respond well; record standard of tolerance and reach 0.0529%, and (manually) standard of tolerance is 0.229% when control without thickness measurement with laser, this injects board, and to record the gear case vibration values in production be MAX.1.4mm/sec; The motor vibrations value is MAX:3.7mm/sec, and it is feasible so far can having determined to adopt thickness measurement with laser control hard tube thickness, but that the production stability of board has influence on the thickness measuring effect is quite huge.

(3) caliber measurement standard is as the checking foundation according to following formula.

Average tolerance mathematical expression is as follows :=

A wherein: table average weight

N1: table the 1 number of samples

N2: table the 2 number of samples

N3: table the 3 number of samples

Nm: table the m number of samples

M: table sampling sum

Average weight: the sum total/number of samples of the total weight of taking a sample

Maximum weight: weight the maximum in the number of samples

Minimum weight: weight reckling in the number of samples

Standard weights: the weight that manufactures a finished product that technical course provides

Average materials %=average weight/standard weights * 100%

Maximum weight: weight in the number of samples

Weight rate %=maximum weight-minimum weight/average weight * 100%

(4) see also shown in Figure 10ly, being after tested 2, " it is by thickness measurement with laser control (automatically) and the hard tube weight distribution curve figure that control (manually) without thickness measuring for (50mm) W pipe, sampling 100pcs hard tube weight.

Abscissa as shown in the figure is hard tube number of samples (propping up), and ordinate is hard tube weight (gram), and the first half is the production weight changing curve without thickness measurement with laser control (manually); Lower Half is the production weight distribution curve variation through thickness measurement with laser control (automatically); By manual curve learn 100pc the heaviest Yu the lightest weight difference reach 43.9 grams; And automation curve learn 100pc the heaviest Yu the lightest weight difference reach 10.2 grams, two control models more as can be known, the effector is than reaching 4 times without thickness measurement with laser effector conservation use amount in employing thickness measurement with laser.

(5) after tested 2 " (50mm) W pipe, sampling 100pcs hard tube weight, its summarized results such as following table are listed:

Hard tube is measured the thickness record
		Production control pattern: manually (without laser controlling)	Production control pattern: (through laser controlling) automatically
The feeding machine revolution is set: 840rpm	Pid parameter setting value: P=30 I=10 D=0
		Product specification: 50mm W pipe	Product specification: 50mm W pipe
Standard weights: 4120g	Standard weights: 4120g
		MAX：4293.5;MIN：4249.6	MAX：4203.0;MIN：4192.8
Average weight: 4274.8g	Average weight: 4197.5g
		Weight rate: 1.03g	Weight rate: 0.24g
Average tolerance: 9.44g standard deviation	Average tolerance: 2.18g standard deviation

Now all kinds of controller system strengths and weaknesses analysis are compared as follows table:

Plant class feature	Extrusion type LVDT control system	Rotary ultrasonic control system	Rotation adds agate ray control system	Laser Measuring thickness control system
					Execute-in-place	The adjustment formality is loaded down with trivial details	Easier	Easier	Easy
Circuit board	Modularity	Modularity	Modularity	Modularity
					The time is changed in maintenance	10～15 minutes	20～30 minutes	20～30 minutes	In 5 minutes
Caliber shows	Can't directly show	Can directly show	Can directly show	Can directly show
					The outer button operation	Do not have	Have	Have	Have
Deixis	Do not have	Have	Have	Have
					Time scheduled maintenance	Needed in every month to stop the linear displacement of thickness measuring is detected transformer; split out arrangement once, 40 minutes stop times	Need stop weekly and put the wiping of ultrasonic thickness measuring head in order 10 minutes stop time	Need stop weekly and put the wiping of ultrasonic thickness measuring head in order 10 minutes stop time	Need stop weekly and put a thickness measurement with laser wiping in order 5 minutes stop time
The maintenance wiring diagram	Have	Have	Have	Have
					Finished weight degree of stability (average tolerance)	0．3％	In 0.3%	In 0.3%	In 0.3%
The HOLD function	Do not have	Have	Have	Have
					Vibration values requirement during injector and tank are produced	Injector 2mm/sec following (die head place); Tank 2mm/sec following (near-lying mode head place)	Injector 5mm/see following (die head place); Tank 5mm/sec following (near-lying mode head place)	Injector 5mm/sec following (die head place); Tank 5mm/sec following (near-lying mode head place)	Injector 5mm/sec following (die head place); Tank 5mm/sec following (near-lying mode head place)

Claims (2)

1. the control method of a laser determination tube thickness of picture tube, it is characterized in that it is a semiconductor laser generator in the laser scanning device that utilizes in the laser control system, the laser that generates is launched by the multiple minute surface of motor rotation, via finder lens laser beam is dispersed ejaculation again, partly laser beam can be blocked by measured object, remaining laser beam is then in reception place, by convergent lens with light-ray condensing, via optical diode with signal collection, after the waveform dispenser square wave is converted to " HI " and reaches " LO " signal, get this " HI " and reach " LO " signal-count value, converting hard tube external diameter value to is shown on the laser controller, and with the signal that produces deliver in the control box with control circuit relatively, obtain the corrected signal of producing linear speed, carry out all fronts speed control;

Again laser controller caliber setting value and the actual value that obtains through the laser scanning device are made comparisons, get its deviate, with this deviate passing ratio, integration, differential switching controller, this value is done the addition correction with the main frame rate signal again, drive the speed of feeding machine speed, to reach control tube thickness of picture tube function;

The laser scanning device is installed in the laser fixed stand mechanism, the quantity-produced hard tube is through between this laser scanning device, by the transmitter emission laser beam, after being subjected to producing hard tube continuously and blocking, receive the laser beam surplus, get industrial trace change signal after converter is handled at the receiver place, the final value that obtains, this signal is made totalizer relatively with all fronts speed of production signal again, obtains speed of production signal completely, to carry out the line speed lifting change control thickness of pipe;

Obtain hard tube caliber change signal by the laser scanning device, be converted to thickness signal through laser controller, change current converter by voltage again and transfer signal to thickness signal, undressed fluctuation signal passing ratio, integration, the processing of differential switching controller obtain thickness signal, change electric pressure converter via electric current again and be converted to thickness signal, through speed of production signal correction all fronts, all fronts speed of production that totalizer is handled, and then the control tube thickness of picture tube;

Stop and the speed adjustment but start, and can directly learn the hard tube caliber that desire measures, and can select manually and automatic function, select whether desire is made thickness measuring is controlled through panel by the laser controller on the guidance panel by control box device direct control feeding machine.

2. the employed equipment of the control method of a laser determination tube thickness of picture tube is characterized in that it mainly is made up of one group of laser control system, one group of laser fixed stand mechanism and one group of control box device; Wherein:

This laser control system is made up of laser controller, laser scanning device, ratio, integration, derivative controller, totalizer and speed setting variohm;

This laser fixed stand mechanism is made up of main backstop, pallet lifting handwheel, the first turning axle latch mechanism, elevating and locking mechanism, the second turning axle latch mechanism, laser scanning device, laser scanning device fixing support rack; It is located at the injector mould discharging and sentences and reach the instant back coupling control thickness of pipe, this is to adopt the shaft type design, vacuum tank transmission side that its migration space is bigger when die change, desire moves into the measurement space of mould rear side again when measuring, wherein fixing the adjustment is at first to adjust pallet lifting handwheel to producing height, by elevating and locking mechanism, with its lifting stationary positioned, via the first turning axle latch mechanism, the thickness measuring direction is fixed, by the second turning axle latch mechanism,, so can record the measured object external diameter again by the laser scanning device with laser scanning device fixing support rack skew stationary positioned;

This control box device is by the pilot lamp group, the feeding machine tachometer gage, the feeding machine reometer, laser controller, ratio, integration, derivative controller, manual selector switch, feeding machine start button switch, feeding machine stop button switch, set data keeps the ON/OFF selector switch, feeding machine speed is adjusted element compositions such as knob, by easy operating and setting, but the direct control feeding machine starts and stops and the speed adjustment, and can directly learn the hard tube caliber that desire measures by the laser controller on the guidance panel, and can select manually or automatic function through panel, select whether desire is done thickness measuring control.

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