CN101831758A - Detection device and method of weft breakage of double-axis warp knitting machine - Google Patents
Detection device and method of weft breakage of double-axis warp knitting machine Download PDFInfo
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- CN101831758A CN101831758A CN 201010177090 CN201010177090A CN101831758A CN 101831758 A CN101831758 A CN 101831758A CN 201010177090 CN201010177090 CN 201010177090 CN 201010177090 A CN201010177090 A CN 201010177090A CN 101831758 A CN101831758 A CN 101831758A
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- yarn
- weft yarn
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- computer controller
- weft
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Abstract
The invention relates to a detection device and a detection method of the weft breakage of a double-axis warp knitting machine. The detection device comprises a programmable computer controller, an input/output module and an irreflexive photoelectric sensor, wherein the programmable computer controller is connected with the input/output module through communication; and the irreflexive photoelectric sensor comprises an infrared transmitter module and an infrared receiver module which are connected with the input/output module through communication respectively. The detection method using the detection device comprises: setting the rotation period TR of the spindle of the double-axis warp knitting machine as D/RI; setting a yarn hanging mode M; detecting if a weft is broken according to the detected position of the weft by the programmable computer controller; and when the programmable computer controller determines the weft is broken, stopping the machine (including emergently stopping the machine) and stopping the weft breakage detection function. The detection device of the invention is simple in structure; and the effect of the detection of weft breakage by the detection method is desirable.
Description
Technical field
The present invention relates to a kind of Yarn break checkout gear and detection method thereof of biaxial warp knitting machine weft yarn.
Background technology
The weft yarn hook of biaxial warp knitting machine shop latitude is 8 inches, and existing weft yarn hook has two kinds: per inch has 2 or 3 to hang the yarn hook.According to technological requirement, hang a yarn on each weft yarn hook, also can on a weft yarn hook, hang a yarn, promptly hung one; Weft handling device once multipotency in shop is laid 8 * 2=16 or 8 * 3=24 root weft yarn simultaneously like this, and the weft yarn of completing is arranged in order by chain and sends into the head braiding.At present in textile industry many Yarn break checkout gears being arranged, all is independent checkout equipment generally, and it is made up of checkout equipment and treatment facility.Checkout equipment generally is to comprise that lens transmitter, lens receiver and photoreceiver carry out correlation and pick up survey, detected yarn is between lens transmitter and lens receiver, the light source that is the lens transmitter sends laser or visible or infrared light ripple, light wave is focused into collimated light beam through lens, and the scioptics receiver focuses to photoreceiver with collimated light beam earlier.Block part light when yarn, photoreceptor sensitization has been lacked, i.e. weft yarn broken yarn not; When weft yarn sees through whole light, photoreceiver sensitization is many, promptly judges the weft yarn broken yarn, and what can judge whether broken yarn of weft yarn according to receiver sensitization, and conventional broken yarn correlation checkout gear is seen Fig. 4.But it is higher to be independent of the cost that the Yarn break checkout gear of a whole set of machinery buys like this, and the easy dust stratification dirt of the camera lens of lens receiver, and reliability is low poor.
Summary of the invention
The objective of the invention is: provide a kind of not only detect effective, reliability is high, and the Yarn break checkout gear of the low biaxial warp knitting machine weft yarn of cost and detect the detection method of weft yarn broken yarn with this checkout gear.
In order to achieve the above object, technical scheme of the present invention is: a kind of Yarn break checkout gear of biaxial warp knitting machine weft yarn, comprise programmable computer controller and input/go out module, described programmable computer controller and input/go out module to communicate to connect, also comprise the diffuse reflection type photoelectric sensor, described diffuse reflection type photoelectric sensor comprises infrared transmission module and infrared receiving module, described infrared transmission module and infrared receiving module respectively with import/go out module and communicate to connect.
In above-mentioned Yarn break checkout gear, the preferred model of described diffuse reflection type photoelectric sensor is 1040-300-506.
A kind of broken yarn detection method of biaxial warp knitting machine weft yarn comprises the following steps:
A, biaxial warp knitting machine main shaft rotation period T is set on programmable computer controller
R=D/RI, wherein, D is two adjacent hook distances that are covered with the latitude hook of weft yarn, R is that rotating speed, the I of biaxial warp knitting machine main shaft is biaxial warp knitting machine main shaft and the speed reducing ratio of spreading the latitude chain, wherein T
RBe according to the resulting theoretical value of formula;
B, be provided with on programmable computer controller and hang yarn mode M, described extension yarn mode M hangs a yarn on each weft yarn hook, perhaps yarn of extension on a weft yarn hook;
C, above the two ends of weft yarn, the diffuse reflection type photoelectric sensor is housed all, the infrared transmission module of described diffuse reflection type photoelectric sensor is infrared radiation continuously, when the infrared ray that infrared transmission module gave off runs into yarn to around diffuse reflection, infrared receiving module receives infrared ray, send the signal that detects weft yarn, and signal is delivered to the position that programmable computer controller is judged weft yarn by importing/go out module;
D, programmable computer controller judge whether broken yarn of weft yarn according to the position that detects weft yarn, and concrete steps are:
(d
1), set up the Mathematical Modeling of broken yarn detection window at programmable computer controller, and the time P that detects weft position is set
R=MD/RI, the described time P that detects weft position
RAt (P
R-Δ T)～(P
R+ Δ T) in the scope, the error time of Δ T for allowing, if do not detect in this time period under the situation of weft yarn, then programmable computer controller is judged the weft yarn broken yarn, and reports to the police;
(d
2), at the broken yarn detection window of programmable computer controller, if the diffuse reflection type photoelectric sensor of weft yarn one end detects the weft yarn signal, and this signal is delivered to programmable computer controller by importing/go out module, and the diffuse reflection type photoelectric sensor of the weft yarn other end is at (P simultaneously
R-Δ T)～(P
R+ Δ T) detect the weft yarn signal in time equally, and this signal is delivered to programmable computer controller by importing/go out module, then programmable computer controller is judged not broken yarn of weft yarn, otherwise, if the diffuse reflection type photoelectric sensor of the weft yarn other end is at (P
R-Δ T)～(P
R+ Δ T) do not detect the weft yarn signal in time, then programmable computer controller is judged the weft yarn broken yarn, and reports to the police;
At the broken yarn detection window of programmable computer controller, if detect the time P of weft position
RAt (P
R-Δ T)～(P
R+ Δ T) outside the scope, even programmable computer controller detects signal, then programmable computer controller is not done any judgement and processing;
At the broken yarn detection window of programmable computer controller, if at (P
R-Δ T)～(P
R+ Δ T) the diffuse reflection type photoelectric sensor at the two ends of weft yarn does not all detect the weft yarn signal in time, and then programmable computer controller is judged the weft yarn broken yarn, and reports to the police;
(d
3), contain jagged weft yarn whether during broken yarn in detection, if the diffuse reflection type photoelectric sensor of weft yarn top detects one or more weft yarn signal, then the broken yarn detection window of programmable computer controller all is judged as the signal that same weft yarn produces, and judge not broken yarn, if the diffuse reflection type photoelectric sensor of weft yarn top does not detect the weft yarn signal, then the broken yarn detection window of programmable computer controller is all judged the weft yarn broken yarn, and reports to the police;
(d
4), if when programmable computer controller is judged the weft yarn broken yarn, then shut down (contain tightly and stop) and stop weft yarn broken yarn measuring ability.
In above-mentioned detection method, if the theoretical value T of the biaxial warp knitting machine main shaft rotation period that actual cycle Ti that programmable computer controller is judged and acquisition biaxial warp knitting machine main shaft rotates and programmable computer controller are provided with
RBetween meet 0.8T
R≤ Ti≤1.2T
RDuring scope, then programmable computer controller carries out the broken yarn judgement to weft yarn and handles;
The theoretical value T of the biaxial warp knitting machine main shaft rotation period that actual cycle Ti that if programmable computer controller is judged and acquisition biaxial warp knitting machine main shaft rotates and programmable computer controller are provided with
RBetween do not meet 0.8T
R≤ Ti≤1.2T
RDuring scope, then programmable computer controller does not carry out the broken yarn judgement to weft yarn and handles.
The good effect that the present invention had is: because checkout gear also comprises the diffuse reflection type photoelectric sensor, described diffuse reflection type photoelectric sensor comprises infrared transmission module and infrared receiving module, described infrared transmission module and infrared receiving module respectively with import/go out module and communicate to connect, what infrared transmission module in the diffuse reflection type photoelectric sensor and infrared receiving module adopted is integral structure, during use, infrared transmission module is infrared radiation continuously forwards, the infrared ray that gives off when running into yarn to around Diffused IR takes place, the dust that yarn produces can not be deposited on the photoelectric sensor, avoided photoelectric sensor that the phenomenon of laying dust is arranged, and checkout gear of the present invention is simple in structure, the reliability height, the detection method of detection weft yarn broken yarn of the present invention is simple, detect effective, and degree of accuracy height.
Description of drawings
Fig. 1 is the structure block diagram of checkout gear of the broken yarn of biaxial warp knitting machine weft yarn of the present invention;
Fig. 2 is the checkout gear user mode schematic diagram figure of the broken yarn of biaxial warp knitting machine weft yarn of the present invention, and 4001 is detected yarn among the figure, and arrow is the direction that yarn moves;
Fig. 3 is the flow chart of detection method of the broken yarn of biaxial warp knitting machine weft yarn of the present invention;
Fig. 4 5001 is light source among the structure block diagram figure of Yarn break checkout gear of biaxial warp knitting machine weft yarn in the prior art, 5002 is diversing lens, 5003 for accepting lens, 5004 is photoreceiver, 5005 for detecting treating apparatus, 6001 is detected yarn, and arrow is the direction that yarn moves;
The specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, 2, a kind of Yarn break checkout gear of biaxial warp knitting machine weft yarn, comprise programmable computer controller 1001 and import/go out module 2001, described programmable computer controller 1001 with import/go out module 2001 and communicate to connect, also comprise diffuse reflection type photoelectric sensor 3001, described diffuse reflection type photoelectric sensor 3001 comprises infrared transmission module 3002 and infrared receiving module 3003, described infrared transmission module 3002 and infrared receiving module 3003 respectively with import/go out module 2001 and communicate to connect.
Diffuse reflection type photoelectric sensor of the present invention is the product of Ke Rui company production preferably, and model is 1040-300-506, and this model has comprised infrared transmission module and infrared receiving module; Certainly, also can adopt the diffuse reflection type photoelectric sensor of other model.
Programmable computer controller of the present invention is the product of Bei Jialai company production preferably, and model is 4PP420.1043-75; Import/go out that module selects for use also is the product that Bei Jialai company produces, model is X20DI9371; Certainly, also can adopt the programmable computer controller of other model and input/go out module.
As shown in Figure 3, a kind of broken yarn detection method of biaxial warp knitting machine weft yarn comprises the following steps:
A, biaxial warp knitting machine main shaft rotation period T is set on programmable computer controller 1001
R=D/RI, wherein, D is two adjacent hook distances that are covered with the latitude hook of weft yarn, R is that rotating speed, the I of biaxial warp knitting machine main shaft is biaxial warp knitting machine main shaft and the speed reducing ratio of spreading the latitude chain, wherein T
RBe according to the resulting theoretical value of formula;
B, be provided with on programmable computer controller 1001 and hang yarn mode M, described extension yarn mode M hangs a yarn on each weft yarn hook, perhaps yarn of extension on a weft yarn hook;
C, because adjacent weft yarn has certain spacing, weft yarn constantly moves on biaxial warp knitting machine, so programmable computer controller 1001 needs to detect earlier the position of weft yarn, thereby, above the two ends of weft yarn, diffuse reflection type photoelectric sensor 3001 is housed all, the infrared transmission module 3002 of described diffuse reflection type photoelectric sensor 3001 is infrared radiation continuously, when the infrared ray that infrared transmission module 3002 is given off runs into yarn to around diffuse reflection, infrared receiving module 3003 receives infrared ray, send the signal that detects weft yarn, and signal is delivered to the position that programmable computer controller 1001 is judged weft yarn by importing/go out module 2001;
D, programmable computer controller 1001 judges whether broken yarn of weft yarn according to the position that detects weft yarn, and concrete steps are:
(d
1), set up the Mathematical Modeling of broken yarn detection window at programmable computer controller 1001, and the time P that detects weft position is set
R=MD/RI, the described time P that detects weft position
RAt (P
R-Δ T)～(P
R+ Δ T) in the scope, the error time of Δ T for allowing, if do not detect in this time period under the situation of weft yarn, then programmable computer controller 1001 is judged the weft yarn broken yarn, and reports to the police;
(d
2), owing to reasons such as inclination can appear in checkout gear and weft yarn, the checkout gear of top, weft yarn two ends is difficult to detect simultaneously weft yarn, thereby, broken yarn detection window at programmable computer controller 1001, if the diffuse reflection type photoelectric sensor 3001 of weft yarn one end detects the weft yarn signal, and this signal is delivered to programmable computer controller 1001 by importing/go out module 2001, and the diffuse reflection type photoelectric sensor 3001 of the weft yarn other end is at (P simultaneously
R-Δ T)～(P
R+ Δ T) detects the weft yarn signal in time equally, and this signal is delivered to programmable computer controller 1001 by importing/go out module 2001, then programmable computer controller 1001 is judged not broken yarn of weft yarn, otherwise, if the diffuse reflection type photoelectric sensor 3001 of the weft yarn other end is at (P
R-Δ T)～(P
R+ Δ T) do not detect the weft yarn signal in time, then programmable computer controller (1001) is judged the weft yarn broken yarn, and reports to the police;
At the broken yarn detection window of programmable computer controller 1001, if detect the time P of weft position
RAt (P
R-Δ T)～(P
R+ Δ T) outside the scope, even programmable computer controller 1001 detects signal, then programmable computer controller 1001 is not done any judgement and processing;
At the broken yarn detection window of programmable computer controller 1001, if at (P
R-Δ T)～(P
R+ Δ T) the diffuse reflection type photoelectric sensor 3001 at the two ends of weft yarn does not all detect the weft yarn signal in time, and then programmable computer controller 1001 is judged the weft yarn broken yarn, and reports to the police;
(d
3), contain jagged weft yarn whether during broken yarn in detection, if the diffuse reflection type photoelectric sensor 3001 of weft yarn top detects one or more weft yarn signal, then the broken yarn detection window of programmable computer controller 1001 all is judged as the signal that same weft yarn produces, and judge not broken yarn, if the diffuse reflection type photoelectric sensor 3001 of weft yarn top does not detect the weft yarn signal, then the broken yarn detection window of programmable computer controller 1001 is all judged the weft yarn broken yarn, and report to the police, wherein hang the width of the width of yarn hook greater than weft yarn, adjacent weft yarn has certain spacing, and the broken yarn detection window of programmable computer controller 1001 all is judged as the signal that same weft yarn produces when detection contains jagged weft yarn;
(d
4), if when programmable computer controller 1001 is judged the weft yarn broken yarns, then shut down (contain tightly and stop) and stop weft yarn broken yarn measuring ability.
In the above-mentioned detection method, the value of Δ T is controlled at 0～P
RScope in, wherein Δ T is 0.2P with the value
RBe Best Times.
In above-mentioned detection method, detect the time P of weft position
RThe linear change along with the speed of main shaft rotation actual cycle Ti, but, biaxial warp knitting machine main shaft rotation period Ti is starting/is changing greatly when stopping, just owing to have only the time about one minute, so generally do not do detection, and under stable operating mode, main shaft rotation period Ti then is a stable value T
R, therefore, if the theoretical value T of the biaxial warp knitting machine main shaft rotation period that actual cycle Ti that programmable computer controller 1001 is judged and acquisition biaxial warp knitting machine main shaft rotates and programmable computer controller 1001 are provided with
RBetween meet 0.8T
R≤ Ti≤1.2T
RDuring scope, then 1001 pairs of weft yarns of programmable computer controller carry out the broken yarn judgement and handle; The theoretical value T of the biaxial warp knitting machine main shaft rotation period that actual cycle Ti that if programmable computer controller 1001 is judged and acquisition biaxial warp knitting machine main shaft rotates and programmable computer controller 1001 are provided with
RBetween do not meet 0.8T
R≤ Ti≤1.2T
RDuring scope, then programmable computer controller 1001 adopts digital filtering to handle detection signal, and weft yarn is not carried out broken yarn judgement and processing.
Checkout gear of the present invention is simple in structure, and does not have laying dust, the reliability height, and the detection method of detection weft yarn broken yarn of the present invention is simple, detection is effective, and the accuracy height.
Claims (4)
1. the Yarn break checkout gear of a biaxial warp knitting machine weft yarn, comprise programmable computer controller (1001) and import/go out module (2001), described programmable computer controller (1001) with import/go out module (2001) and communicate to connect, it is characterized in that: also comprise diffuse reflection type photoelectric sensor (3001), described diffuse reflection type photoelectric sensor (3001) comprises infrared transmission module (3002) and infrared receiving module (3003), described infrared transmission module (3002) and infrared receiving module (3003) respectively with import/go out module (2001) and communicate to connect.
2. the Yarn break checkout gear of biaxial warp knitting machine weft yarn according to claim 1 is characterized in that: the model of described diffuse reflection type photoelectric sensor (3001) is 1040-300-506.
3. the broken yarn detection method of a biaxial warp knitting machine weft yarn is characterized in that: comprise the following steps:
A, biaxial warp knitting machine main shaft rotation period T is set on programmable computer controller (1001)
R=D/RI, wherein, D is two adjacent hook distances that are covered with the latitude hook of weft yarn, R is that rotating speed, the I of biaxial warp knitting machine main shaft is biaxial warp knitting machine main shaft and the speed reducing ratio of spreading the latitude chain, wherein T
RBe according to the resulting theoretical value of formula;
B, be provided with on programmable computer controller (1001) and hang yarn mode M, described extension yarn mode M hangs a yarn on each weft yarn hook, perhaps yarn of extension on a weft yarn hook;
C, above the two ends of weft yarn, diffuse reflection type photoelectric sensor (3001) is housed all, the infrared transmission module (3002) of described diffuse reflection type photoelectric sensor (3001) is infrared radiation continuously, when the infrared ray that infrared transmission module (3002) is given off runs into yarn to around diffuse reflection, infrared receiving module (3003) receives infrared ray, send the signal that detects weft yarn, and signal is delivered to the position that programmable computer controller (1001) is judged weft yarn by importing/go out module (2001);
D, programmable computer controller (1001) judge whether broken yarn of weft yarn according to the position that detects weft yarn, and concrete steps are:
(d
1), set up the Mathematical Modeling of broken yarn detection window at programmable computer controller (1001), and the time P that detects weft position is set
R=MD/RI, the described time P that detects weft position
RAt (P
R-Δ T)～(P
R+ Δ T) in the scope, the error time of Δ T for allowing, if do not detect in this time period under the situation of weft yarn, then programmable computer controller (1001) is judged the weft yarn broken yarn, and reports to the police;
(d
2), at the broken yarn detection window of programmable computer controller (1001), if the diffuse reflection type photoelectric sensor (3001) of weft yarn one end detects the weft yarn signal, and this signal is delivered to programmable computer controller (1001) by importing/go out module (2001), and the diffuse reflection type photoelectric sensor (3001) of the weft yarn other end is at (P simultaneously
R-Δ T)～(P
R+ Δ T) detects the weft yarn signal in time equally, and this signal is delivered to programmable computer controller (1001) by importing/go out module (2001), then programmable computer controller (1001) is judged not broken yarn of weft yarn, otherwise, if the diffuse reflection type photoelectric sensor (3001) of the weft yarn other end is at (P
R-Δ T)～(P
R+ Δ T) do not detect the weft yarn signal in time, then programmable computer controller (1001) is judged the weft yarn broken yarn, and reports to the police;
At the broken yarn detection window of programmable computer controller (1001), if detect the time P of weft position
RAt (P
R-Δ T)～(P
R+ Δ T) outside the scope, even programmable computer controller (1001) detects signal, then programmable computer controller (1001) is not done any judgement and processing;
At the broken yarn detection window of programmable computer controller (1001), if at (P
R-Δ T)～(P
R+ Δ T) the diffuse reflection type photoelectric sensor (3001) at the two ends of weft yarn does not all detect the weft yarn signal in time, and then programmable computer controller (1001) is judged the weft yarn broken yarn, and reports to the police;
(d
3), contain jagged weft yarn whether during broken yarn in detection, if the diffuse reflection type photoelectric sensor (3001) of weft yarn top detects one or more weft yarn signal, then the broken yarn detection window of programmable computer controller (1001) all is judged as the signal that same weft yarn produces, and judge not broken yarn, if the diffuse reflection type photoelectric sensor (3001) of weft yarn top does not detect the weft yarn signal, then the broken yarn detection window of programmable computer controller (1001) is all judged the weft yarn broken yarn, and reports to the police;
(d
4), if when programmable computer controller (1001) is judged the weft yarn broken yarn, then shut down (contain tightly and stop) and stop weft yarn broken yarn measuring ability.
4. the broken yarn detection method of biaxial warp knitting machine weft yarn according to claim 3 is characterized in that: if the theoretical value T of the biaxial warp knitting machine main shaft rotation period that actual cycle Ti that programmable computer controller (1001) is judged and acquisition biaxial warp knitting machine main shaft rotates and programmable computer controller (1001) are provided with
RBetween meet 0.8T
R≤ Ti≤1.2T
RDuring scope, then programmable computer controller (1001) carries out the broken yarn judgement to weft yarn and handles;
The theoretical value T of the biaxial warp knitting machine main shaft rotation period that actual cycle Ti that if programmable computer controller (1001) is judged and acquisition biaxial warp knitting machine main shaft rotates and programmable computer controller (1001) are provided with
RBetween do not meet 0.8T
R≤ Ti≤1.2T
RDuring scope, then programmable computer controller (1001) does not carry out the broken yarn judgement to weft yarn and handles.
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|---|---|---|---|
| CN 201010177090 CN101831758B (en) | 2010-05-20 | 2010-05-20 | Detection device and method of weft breakage of double-axis warp knitting machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010177090 CN101831758B (en) | 2010-05-20 | 2010-05-20 | Detection device and method of weft breakage of double-axis warp knitting machine |
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| CN101831758B CN101831758B (en) | 2013-05-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102701017A (en) * | 2012-06-18 | 2012-10-03 | 南京烽火藤仓光通信有限公司 | Anti-loosening method for conical fiber winding method |
| CN103064336A (en) * | 2013-01-29 | 2013-04-24 | 赵清滨 | Control method and device for reducing spinning yarn breakage of spinning frame |
| CN103696104A (en) * | 2013-12-30 | 2014-04-02 | 苏州尤盛纺织有限公司 | Self-adaptive weft catching device |
| CN104375457A (en) * | 2013-01-29 | 2015-02-25 | 赵清滨 | Control method and device for reducing spinning frame spinning yarn broken ends |
| CN108060507A (en) * | 2018-01-25 | 2018-05-22 | 常州市新创智能科技有限公司 | Weft yarn needle needle-break detection device and its application method |
| CN114521819A (en) * | 2022-03-22 | 2022-05-24 | 江西艾芬达暖通科技股份有限公司 | Photoelectric sensing electric towel rack based on diffuse reflection principle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102701017A (en) * | 2012-06-18 | 2012-10-03 | 南京烽火藤仓光通信有限公司 | Anti-loosening method for conical fiber winding method |
| CN103064336A (en) * | 2013-01-29 | 2013-04-24 | 赵清滨 | Control method and device for reducing spinning yarn breakage of spinning frame |
| CN104375457A (en) * | 2013-01-29 | 2015-02-25 | 赵清滨 | Control method and device for reducing spinning frame spinning yarn broken ends |
| CN104765319A (en) * | 2013-01-29 | 2015-07-08 | 赵清滨 | Control method for reducing spinning yarn breakage of spinning frame |
| CN103064336B (en) * | 2013-01-29 | 2015-07-22 | 潍坊医学院 | Control method and device for reducing spinning yarn breakage of spinning frame |
| CN104765319B (en) * | 2013-01-29 | 2018-02-23 | 宁夏如意科技时尚产业有限公司 | A kind of control method for being used to reduce spinning frame spinning Yarn break |
| CN103696104A (en) * | 2013-12-30 | 2014-04-02 | 苏州尤盛纺织有限公司 | Self-adaptive weft catching device |
| CN108060507A (en) * | 2018-01-25 | 2018-05-22 | 常州市新创智能科技有限公司 | Weft yarn needle needle-break detection device and its application method |
| CN114521819A (en) * | 2022-03-22 | 2022-05-24 | 江西艾芬达暖通科技股份有限公司 | Photoelectric sensing electric towel rack based on diffuse reflection principle |
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| CN101831758B (en) | 2013-05-08 |
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