CN108168442A - A kind of waterstop tongue and groove dynamic measurement device and its measuring method - Google Patents
A kind of waterstop tongue and groove dynamic measurement device and its measuring method Download PDFInfo
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- CN108168442A CN108168442A CN201810264473.0A CN201810264473A CN108168442A CN 108168442 A CN108168442 A CN 108168442A CN 201810264473 A CN201810264473 A CN 201810264473A CN 108168442 A CN108168442 A CN 108168442A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0691—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of objects while moving
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/058—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/16—Plc to applications
- G05B2219/163—Domotique, domestic, home control, automation, smart, intelligent house
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention belongs to dynamic measuring tech fields, concretely relate to a kind of waterstop tongue and groove dynamic measurement device and its dynamic measurement method.Mainly by linear module, frame is set on its slide plate, it is set on frame, the vertically aligned distance measuring unit and PLC control unit of lower beam column are formed, waterstop between distance measuring unit horizontal through, linear module is driven by the first servo motor, and frame is kept to be moved at the same speed with waterstop in a dynamic measurement period, distance measuring unit includes upper, lower laser range sensor, on, lower beam column sets vertical with waterstop horizontal movement direction upper, lower ball-screw, on, lower ball-screw is respectively by second, third servo motor drives, on PLC control unit receives, the distance measuring signal that lower laser range sensor is sent, and to first, second, third servo motor sends control instruction.The dynamic measurement device has the characteristics that the width and thickness data of being capable of dynamic real-time measurement waterstop tongue and groove.
Description
Technical field
The invention belongs to dynamic measuring tech field, concretely relate to a kind of waterstop tongue and groove dynamic measurement device and its
Measuring method.
Background technology
In order to improve water-stagnating effect, waterstop is provided with tongue and groove, for extending penetrating passage and improving sealing ability.
Therefore, the tongue and groove thickness and width two indices of waterstop need to be controlled strictly, otherwise will directly affect product quality.
Many enterprises are in equipment and technology upgrading and transformation process, all sealing tape thickness, width on-line monitoring equipment
Important symbol used as measurement technology transformation success or not.However restricted by objective factors such as fund, research and development abilities, at present
There are no install such monitoring device in most of waterstop manufacturers.Therefore, sealing tape thickness, width on-line monitoring are developed
Equipment is of great significance to ensuring waterstop product quality, raising production efficiency, promoting industrial automation level.
With the fast development of measuring technique, dimension of object measurement is converted from the artificial of most original using miking
For online non-cpntact measurement, in terms of thickness measure, common measuring method includes：Laser measurement, capacitance measurement and radionetric survey
Method etc., but all do not consider to measure waterstop tongue and groove thickness and width simultaneously.
Invention content
It is an object of the invention to provide a kind of width and thickness data for being capable of dynamic real-time measurement waterstop tongue and groove
Waterstop tongue and groove dynamic measurement device and its measuring method.
To achieve the above object, the technical solution adopted in the present invention is：
A kind of waterstop tongue and groove dynamic measurement device, it is characterised in that：Mainly by linear module, the slide plate of the linear module
Upper setting frame, the vertically aligned distance measuring unit and PLC control unit for being set to the upper and lower beam column of the frame are formed,
In, waterstop between the distance measuring unit horizontal through the linear module is driven by the first servo motor, and a dynamic
The frame is kept to be moved at the same speed with waterstop in measurement period, the distance measuring unit includes being set to being used for for the upper beam column
The upper laser range sensor with waterstop upper surface vertical range is measured, be set to the lower beam column is used for measurement and sealing
Lower laser range sensor with lower surface vertical range, the upper and lower beam column setting are vertical with waterstop horizontal movement direction
Upper and lower ball-screw, the upper and lower laser range sensor is respectively arranged at the upper and lower cunning of the upper and lower ball-screw
Block, the upper and lower ball-screw are driven respectively by second, third servo motor, and the PLC control unit receives described upper and lower
The distance measuring signal that laser range sensor is sent, and send control instruction to first, second, third servo motor.
The additional technical feature for forming a kind of above-mentioned waterstop tongue and groove dynamic measurement device further includes：
--- tilt swing arm, inclination swing arm end setting and waterstop lower surface positioned at the linear module one end setting
Pulse signal is sent to the PLC by the synchro measure wheel of contact, the interior setting encoder of the synchro measure wheel, the encoder
Control unit, for calculating the horizontal movement speed of waterstop；
--- the frame by the upper beam column, lower beam column and on described beam column, lower beam column one end connect column structure
Into.
The present invention also provides a kind of waterstop bumps groove width is carried out using above-mentioned waterstop tongue and groove dynamic measurement device
The dynamic measurement method of degree and thickness, key step include：
--- step 1, the synchro measure wheel are synchronized with the movement with waterstop, and the encoder is sent to the PLC control unit
Pulse signal calculates the movement velocity of waterstop within the unit interval,
Calculating process is,, wherein,For the movement velocity of waterstop,For synchro measure wheel radius,For
Encoder rotates a circle umber of pulse,For the unit time, the collected umber of pulse of PLC control unit isP r ；
Step 2, the PLC control unit make described to the first servo motor sending action of the linear module is driven to instruct
Slide plate and the frame being arranged on move at the same speed with the waterstop（The upper and lower laser range sensor i.e. in frame exists
It is kept on the direction of waterstop horizontal movement opposing stationary with waterstop）, control process is,
, wherein,For the movement velocity of waterstop,To drive the first servo motor stepping angle of linear module
Radian,For the helical pitch of linear module leading screw,PI.e. PLC control unit is in the unit intervalThe arteries and veins that introversive first servo motor is sent
Rush number.
Step 3, the PLC control unit are instructed to second, third described servo motor sending action, are made described upper and lower
Laser range sensor is on vertical waterstop horizontal movement direction（That is the width of waterstop）It is synchronized with the movement, movement velocity isv,
Distance measuring signal to be collected, calculates the width value and thickness value of waterstop tongue and groove, process is,
The each time interval of upper and lower laser range sensor, ranging information is sent to PLC control unit, respectively, , the upper and lower vertically aligned spacing of laser range sensor is definite value。
The THICKNESS CALCULATION of waterstop and tongue and groove is carried out, ；
During initial position, the upper and lower laser range sensor corresponds to a side edge of waterstop,d i For the basic of waterstop
Thickness lambda, whend i+1 > d i Andd i+1 d i ≥ξ（ξ is that preset concave-convex slot thickness and the difference minimum of basic thickness lambda judge often
Number）When, the upper and lower laser range sensor enters i-th of tongue region of waterstop, counter labelm = P0+1；（P0
It is the upper and lower laser range sensor with intervalSend the serial number of distance measuring signal）
Whend i+1 d i <During ξ, the upper and lower laser range sensor has measured i-th of tongue, counter labeln = Pi；（Pi
The serial number of distance measuring signal is sent at this moment for the upper and lower laser range sensor）
The PLC control unit calculates theiThe width of a tongue is,L i=（n m）Vt
The PLC control unit calculates theiThe thickness of a tongue is,
TheiThe width of a groove and the measurement process of thickness be,
Whend i+1 < d i Andd i d i+1 During >=ξ, the upper and lower laser range sensor enters waterstopiA groove area
Domain, counter labelm = P0 ’+1；（P0 ’It is the upper and lower laser range sensor with intervalTSend the serial number of distance measuring signal）
Whend i d i+1 <During ξ, the upper and lower laser range sensor has measurediA groove area, counter labeln =
Pi ’；（ Pi ’The serial number of distance measuring signal is sent at this moment for the upper and lower laser range sensor）
The PLC control unit calculates theiThe width of a groove is,L i=（n m）Vt
The PLC control unit calculates theiThe thickness of a groove is,
Step 4, the upper and lower laser range sensor move to end along upper and lower ball-screw, reach the another of waterstop
Side edge,d i During basic thickness lambda for waterstop, the sampling dynamic completed in a cycle measures, and repeats step 1, carries out
The dynamic in next period measures.
A kind of waterstop tongue and groove dynamic measurement device provided by the present invention compared with prior art, has following excellent
Point：First, since the dynamic measurement device is mainly by linear module, the frame that is set on slide plate is set to the upper and lower beam of frame
The vertically aligned distance measuring unit and PLC control unit of column are formed, and functional configuration is simple, and component layouts are compact, is readily produced
Manufacture；Second, due to distance measuring unit include being set to beam column on frame for measuring and waterstop upper surface vertical range
Upper laser range sensor, be set to beam column under frame for measuring the lower laser ranging with waterstop lower surface vertical range
Sensor, when waterstop between distance measuring unit horizontal through, linear module is driven by the first servo motor, and one dynamic survey
Frame is kept to be moved at the same speed with waterstop in the amount period, the upper and lower beam column setting of frame is vertical with waterstop horizontal movement direction
Upper and lower ball-screw, upper and lower laser range sensor are respectively arranged at the upper and lower sliding block of upper and lower ball-screw, you can with
Waterstop motion state similarly hereinafter walks the measurement for carrying out concave-convex well width and thickness, can grasp the processing of waterstop tongue and groove in time
Quality realizes the real-time monitoring of production process, is also the lower processing link of waterstop, such as gluing, overlay film, provides standard
Data；Third, since upper and lower ball-screw is driven respectively by second, third servo motor, described in PLC control unit reception
The distance measuring signal that upper and lower laser range sensor is sent, and send control instruction, dynamic to first, second, third servo motor
Measurement process realizes whole automations, and can adjust in real time, and measurement data is more accurate.
Description of the drawings
Fig. 1 is a kind of stereoscopic schematic diagram of waterstop tongue and groove dynamic measurement device of the present invention；
Fig. 2 is the front view of the waterstop tongue and groove dynamic measurement device；
Fig. 3 is a kind of waterstop tongue and groove dynamic measurement method schematic diagram of the present invention；
Fig. 4 is PLC calculation procedure flow diagrams in the tongue and groove dynamic measurement method.
Specific embodiment
Structure to a kind of waterstop tongue and groove dynamic measurement device provided by the present invention and work below in conjunction with the accompanying drawings
Principle is described in further detail.
As shown in Figure 1, for a kind of structure diagram of waterstop tongue and groove dynamic measurement device provided by the present invention.Structure
Into the dynamic measurement device structure mainly by linear module 1, frame 2 on the slide plate 11 of linear module 1 is set, is set to frame
2 upper and lower beam columns（21、22）Vertically aligned distance measuring unit 3 and PLC control unit 4 form, wherein, waterstop 10 is from survey
Away between unit 3 horizontal through linear module 1 is driven by the first servo motor 12, and holding frame in a dynamic measurement period
Frame 2 moves at the same speed with waterstop 10, and distance measuring unit 3 includes being set to hanging down with 10 upper surface of waterstop for measuring for beam column 21
The upper laser range sensor 31 of straight distance, be set to lower beam column 22 is used for measurement and 10 lower surface vertical range of waterstop
Lower laser range sensor 32, upper and lower beam column（21、22）The setting upper and lower ball vertical with 10 horizontal movement direction of waterstop
Leading screw（211、221）, upper and lower laser range sensor（31、32）It is respectively arranged at upper and lower ball-screw（211、221）It is upper,
Sliding block（212、222）, upper and lower ball-screw（211、221）Respectively by second, third servo（213、223）Motor drives,
PLC control unit 4 receives upper and lower laser range sensor（31、32）The distance measuring signal of transmission, and watched to first, second, third
Take motor（12、213、223）Send control instruction.
Its operation principle is：The direction of motion of the transmission direction of linear module 1 and waterstop 10 is set as horizontal in the same direction,
First servo motor 12 drives the slide plate 11 of linear module 1, makes frame 2 in holding and waterstop within a dynamic acquisition period
10 is opposing stationary（Keep synchronized movement）, second, third servo motor（213、223）Upper and lower laser ranging is respectively driven to pass
Sensor（31、32）It synchronizes and moves along the width of waterstop 10, keep precisely aligning, waterstop 10 is horizontally entered into frame 2
Distance measuring unit 3, the upper and lower laser range sensor of distance measuring unit 3（31、32）, acquire and 10 upper and lower surface of waterstop respectively
Vertical range, data are carried out by PLC control unit 4 width and thickness of tongue and groove are calculated in time.
In the structure for forming above-mentioned waterstop tongue and groove dynamic measurement device,
--- as shown in Fig. 2, in order to ensure upper and lower laser range sensor（31、32）Dynamic measure 10 thickness of waterstop and
The consistency of measuring point during width sets positioned at linear 1 one end of module and tilts swing arm 13, tilt the setting of swing arm 13 end with
The synchro measure wheel 14 of 10 lower surface of waterstop contact, the interior setting encoder 15 of synchro measure wheel 14, encoder 15 believe pulse
Number PLC control unit 4 is sent to, for calculating the horizontal movement speed of waterstop 10, is capable of the fortune of Real-time Feedback waterstop 10
Dynamic speed sends adjustment signal for PLC control unit 4 to the first servo motor 12, passes frame 2 and upper and lower laser ranging
Sensor（31、32）With waterstop 10 absolute rest is kept on the direction of horizontal movement；
--- preferred, said frame 2 is by the upper beam column 21, lower beam column 22 and in upper beam column 21, the one end of lower beam column 22
The column 23 of connection is formed, and opening 2 personnel's observation device operating condition easy to operation of frame, go wrong timely adjustment；
As shown in figure 3, be using the method that above-mentioned waterstop tongue and groove dynamic measurement device is measured into Mobile state,
--- step 1, synchro measure wheel 14 are synchronized with the movement with waterstop 10, and encoder 15 sends pulse to PLC control unit 4
Signal calculates the movement velocity of waterstop 10 within the unit interval,
Calculating process is,, wherein,For the movement velocity of waterstop 10,For synchro measure wheel 14 half
Diameter,It rotates a circle umber of pulse for encoder 15,For the unit time, 4 collected umber of pulse of PLC control unit isP r ；
Step 2, PLC control unit 4 make slide plate 11 to 12 sending action of the first servo motor of linear module 1 is driven to instruct
And the frame 2 being arranged on moves at the same speed with water band（Upper and lower laser range sensor i.e. in frame 2（31、32）In waterstop
It is kept on the direction of 10 horizontal movements opposing stationary with waterstop 10）, control process is,
, wherein,For the movement velocity of waterstop 10,To drive 12 stepping of the first servo motor of linear module 1
The radian at angle,For the helical pitch of linear 1 leading screw of module,PI.e. PLC control unit 4 is in the unit intervalIntroversive first servo motor 12
The umber of pulse of transmission.
Step 3, PLC control unit 4 is to second, third servo（213、223）Motor sending action instructs, and makes to swash above and below
Ligh-ranging sensor（31、32）On vertical 10 horizontal movement direction of waterstop（That is the width of waterstop 10）It is synchronized with the movement, transports
Dynamic speed isv, distance measuring signal is collected, calculates the width value and thickness value of 10 tongue and groove of waterstop, as shown in figure 4, its process is,
The upper and lower laser range sensor（31、32）Each time interval, ranging letter is sent to PLC control unit 4
Breath, respectively, , upper and lower laser range sensor（31、32）Vertically aligned spacing is definite value。
The THICKNESS CALCULATION of waterstop 10 and tongue and groove is carried out, ；
During initial position, the upper and lower laser range sensor（31、32）Corresponding to a side edge of waterstop 10,d i Until
The basic thickness lambda of water band 10,
Whend i+1 > d i Andd i+1 d i ≥ξ（ξ is that preset concave-convex slot thickness and the difference minimum of basic thickness lambda judge often
Number）When, upper and lower laser range sensor（31、32）Enter i-th of the tongue region of waterstop 10, counter labelm = P0+
1；（P0For upper and lower laser range sensor（31、32）With intervalSend the serial number of distance measuring signal）
Whend i+1 d i <During ξ, upper and lower laser range sensor（31、32）I-th of tongue, counter label are measuredn =
Pi；（PiFor upper and lower laser range sensor（31、32）The serial number of distance measuring signal has been sent at this moment）
PLC control unit 4 calculates theiThe width of a tongue is,L i=（n m）Vt
PLC control unit 4 calculates theiThe thickness of a tongue is,
TheiThe width of a groove and the measurement process of thickness be,
Whend i+1 < d i Andd i d i+1 During >=ξ, upper and lower laser range sensor（31、32）Enter waterstop 10iIt is a recessed
Slot region, counter labelm = P0 ’+1；（P0 ’For upper and lower laser range sensor（31、32）With intervalTSend distance measuring signal
Serial number）
Whend i d i+1 <During ξ, upper and lower laser range sensor（31、32）MeasureiA groove area, counter labeln =
Pi ’；（ Pi ’For upper and lower laser range sensor（31、32）The serial number of distance measuring signal has been sent at this moment）
PLC control unit 4 calculates theiThe width of a groove is,L i=（n m）Vt
PLC control unit 4 calculates theiThe thickness of a groove is,
Step 4, upper and lower laser range sensor（31、32）Along upper and lower ball-screw（211、221）End is moved to, is reached
The opposite side edge of waterstop 10,d i During basic thickness lambda for waterstop 10, the sampling dynamic completed in a cycle is surveyed
Amount repeats step 1, and the dynamic for carrying out next period measures.
Claims (4)
1. a kind of waterstop tongue and groove dynamic measurement device, it is characterised in that：Mainly by linear module, the cunning of the linear module
Frame is set on plate, the vertically aligned distance measuring unit and PLC control unit for being set to the upper and lower beam column of the frame are formed,
Wherein, waterstop between the distance measuring unit horizontal through the linear module is driven by the first servo motor, and one dynamic
The frame is kept to be moved at the same speed with waterstop in state measurement period, the distance measuring unit includes the use for being set to the upper beam column
In measure with the upper laser range sensor of waterstop upper surface vertical range, be set to the lower beam column for measure with only
Lower laser range sensor of the water with lower surface vertical range, the upper and lower beam column setting are hung down with waterstop horizontal movement direction
Straight upper and lower ball-screw, the upper and lower laser range sensor are respectively arranged at the upper and lower cunning of the upper and lower ball-screw
Block, the upper and lower ball-screw are driven respectively by second, third servo motor, and the PLC control unit receives described upper and lower
The distance measuring signal that laser range sensor is sent, and send control instruction to first, second, third servo motor.
2. a kind of waterstop tongue and groove dynamic measurement device according to claim 1, it is characterised in that：Positioned at described linear
The setting of module one end tilts swing arm, the synchro measure wheel for tilting the setting of swing arm end and being contacted with waterstop lower surface, institute
It states setting encoder, the encoder in synchro measure wheel and pulse signal is sent to the PLC control unit, stop for calculating
The horizontal movement speed of water band.
3. a kind of waterstop tongue and groove dynamic measurement device according to claim 1, it is characterised in that：The frame is by institute
It states beam column, lower beam column and beam column, the column that the one end of lower beam column connects is formed on described.
4. a kind of dynamic measurement method of waterstop bumps slot thickness, using the waterstop tongue and groove dynamic described in claim 2
Measuring device, it is characterised in that：Including
Step 1, the synchro measure wheel are synchronized with the movement with waterstop, and the encoder sends pulse to the PLC control unit
Signal calculates the movement velocity of waterstop within the unit interval,
Calculating process is,, wherein,For the movement velocity of waterstop,For synchro measure wheel radius,
It rotates a circle umber of pulse for encoder,For the unit time, the collected umber of pulse of PLC control unit isP r ；
Step 2, the PLC control unit make described to the first servo motor sending action of the linear module is driven to instruct
Slide plate and the frame being arranged on move at the same speed with the waterstop（The upper and lower laser range sensor i.e. in frame exists
It is kept on the direction of waterstop horizontal movement opposing stationary with waterstop）, control process is,
, wherein,For the movement velocity of waterstop,To drive the first servo motor stepping angle of linear module
Radian,For the helical pitch of linear module leading screw,PI.e. PLC control unit is in the unit intervalThe arteries and veins that introversive first servo motor is sent
Rush number；
Step 3, the PLC control unit are instructed to second, third described servo motor sending action, make the upper and lower laser
Distance measuring sensor is on vertical waterstop horizontal movement direction（That is the width of waterstop）It is synchronized with the movement, movement velocity isv, collect
Distance measuring signal calculates the width value and thickness value of waterstop tongue and groove, and process is,
The each time interval of upper and lower laser range sensor, ranging information is sent to PLC control unit, respectively, , the upper and lower vertically aligned spacing of laser range sensor is definite value；
The THICKNESS CALCULATION of waterstop and tongue and groove is carried out, ；
During initial position, the upper and lower laser range sensor corresponds to a side edge of waterstop,d i For the basic of waterstop
Thickness lambda, whend i+1 > d i Andd i+1 d i ≥ξ（ξ is that preset concave-convex slot thickness and the difference minimum of basic thickness lambda judge
Constant）When, the upper and lower laser range sensor enters i-th of tongue region of waterstop, counter labelm = P0+1；
（P0It is the upper and lower laser range sensor with intervalSend the serial number of distance measuring signal）
Whend i+1 d i <During ξ, the upper and lower laser range sensor has measured i-th of tongue, counter labeln = Pi；（Pi
The serial number of distance measuring signal is sent at this moment for the upper and lower laser range sensor）
The PLC control unit calculates theiThe width of a tongue is,L i=（n m）Vt
The PLC control unit calculates theiThe thickness of a tongue is,
TheiThe width of a groove and the measurement process of thickness be,
Whend i+1 < d i Andd i d i+1 During >=ξ, the upper and lower laser range sensor enters waterstopiA groove area
Domain, counter labelm = P0 ’+1；（P0 ’It is the upper and lower laser range sensor with intervalTSend the serial number of distance measuring signal）
Whend i d i+1 <During ξ, the upper and lower laser range sensor has measurediA groove area, counter labeln =
Pi ’；（ Pi ’The serial number of distance measuring signal is sent at this moment for the upper and lower laser range sensor）
The PLC control unit calculates theiThe width of a groove is,L i=（n m）Vt
The PLC control unit calculates theiThe thickness of a groove is,
Step 4, the upper and lower laser range sensor move to end along upper and lower ball-screw, reach the another of waterstop
Side edge,d i During basic thickness lambda for waterstop, the sampling dynamic completed in a cycle measures, and repeats step 1, carries out
The dynamic in next period measures.
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| CN201810264473.0A CN108168442B (en) | 2018-03-28 | 2018-03-28 | Dynamic measurement method of dynamic measurement device for concave-convex groove of water stop |
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| CN201810264473.0A CN108168442B (en) | 2018-03-28 | 2018-03-28 | Dynamic measurement method of dynamic measurement device for concave-convex groove of water stop |
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| CN110906873A (en) * | 2019-12-13 | 2020-03-24 | 赫得纳米科技（黄石）有限公司 | Automatic thickness measuring machine for touch display screen |
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