CN105197715B - The fault diagnosis method and system of light curtain protective device - Google Patents
The fault diagnosis method and system of light curtain protective device Download PDFInfo
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- CN105197715B CN105197715B CN201510711657.3A CN201510711657A CN105197715B CN 105197715 B CN105197715 B CN 105197715B CN 201510711657 A CN201510711657 A CN 201510711657A CN 105197715 B CN105197715 B CN 105197715B
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Abstract
The present invention relates to a kind of fault diagnosis method and system of light curtain protective device, the method for diagnosing faults of wherein light curtain protective device includes the following steps：Light curtain signal is received by the first signal circuit；According to light curtain signal, the luminous point occlusion state of light curtain is obtained, and according to luminous point occlusion state, judge that light curtain whether there is failure, and when the determination result is yes, obtain light curtain fault type；Light curtain fault type is sent to maintenance terminal by fourth signal circuit.The light curtain signal received by gating plate, the occlusion state of luminous point is obtained, and detects the fault type of light curtain according to the occlusion state of luminous point, and fault message is sent to maintenance terminal, timely and effective light curtain failure can be accurately excluded, enable elevator normal operation and ensure the safety of passenger.To ensure that in the first time that failure occurs, allow maintenance staff that can obtain information.
Description
Technical field
Protect field the present invention relates to elevator safety, a kind of method for diagnosing faults more particularly to light curtain protective device and
System.
Background technology
Safety protection apparatus for elevator has Machine guarding and photoelectric protector, Machine guarding to be often referred to touch panel,
Photoelectric protector is often referred to light curtain.Wherein, the protection philosophy of touch panel is：Obstruction is by hitting touch panel to trigger microswitch
Action, and then play a protective role；The protection philosophy of light curtain is：Transmitting terminal emits infrared light, and receiving terminal receives infrared light,
If there is obstruction, receiving terminal can not receive infrared light, that is, send out block signal, to reach the work(of protection passenger and object
Energy.Light curtain protection is contactless protection, more safe and reliable to passenger and object.
Passenger progress safeguard protection of the new clothes elevator substantially all using light curtain protective device to disengaging elevator at present, but light
Curtain is used as optoelectronic integration product, because being influenced by environmental factor and own characteristic influences, failure rate is relatively high.It passes
Troubleshooting mode is in system technology：After the phenomenon that elevator appearance cannot close the door or press from both sides people, in-situ processing is carried out by technical staff.
And for the processing mode of traditional technology, inventor has found that at least there are the following problems：It, should after above-mentioned failure occurs in elevator
Failure could be passive by feedback processing, the promptness of traditional treatment method, reliability Shortcomings.
Invention content
Based on this, it is necessary to be directed to the troubleshooting reliable problem not prompt enough of elevator car safety, provide a kind of light
The fault diagnosis method and system of curtain protective device.
To achieve the goals above, the embodiment of technical solution of the present invention is：
On the one hand, a kind of method for diagnosing faults of light curtain protective device is provided, is included the following steps：
Light curtain signal is received by the first signal circuit；
According to light curtain signal, the luminous point occlusion state of light curtain is obtained, and according to luminous point occlusion state, judge whether light curtain deposits
In failure, and when the determination result is yes, light curtain fault type is obtained；
Light curtain fault type is sent to maintenance terminal by fourth signal circuit.
On the other hand, a kind of fault diagnosis system of light curtain protective device is provided, including：
Receiving unit, for receiving light curtain signal by the first signal circuit；
Failure judgement unit, for according to light curtain signal, obtaining the luminous point occlusion state of light curtain, and shape is blocked according to luminous point
State judges that light curtain whether there is failure, and when the determination result is yes, obtains light curtain fault type；
Light curtain fault type is sent to maintenance terminal by transmission unit for passing through fourth signal circuit.
Above-mentioned technical proposal has the advantages that：
The fault diagnosis method and system of the light curtain protective device of the present invention, the light curtain signal received by gating plate, are obtained
The occlusion state of luminous point is taken, and detects the fault type of light curtain according to the occlusion state of luminous point, and fault message is sent to
Maintenance terminal timely and effective can accurately exclude light curtain failure, enable elevator normal operation and ensure the safety of passenger.
To ensure that in the first time that failure occurs, allow maintenance staff that can obtain information.Maintenance staff can be according to gate plate
The different faults type information of transmission takes quick, effective maintenance means to find failure, debugging, it is ensured that the peace of elevator
Complete and normal use.
Description of the drawings
By being more particularly described for the preferred embodiment of the present invention shown in attached drawing, above and other mesh of the invention
, feature and advantage will become more fully apparent.Identical reference numeral indicates identical part in whole attached drawings, and does not carve
Meaning draws attached drawing by actual size equal proportion scaling, it is preferred that emphasis is shows the purport of the present invention.
Fig. 1 is the flow diagram of the method for diagnosing faults embodiment 1 of light curtain protective device of the present invention；
Fig. 2 is the signal circuit schematic diagram in the method for diagnosing faults embodiment 1 of light curtain protective device of the present invention；
Fig. 3 is the flow diagram of the method for diagnosing faults embodiment 2 of light curtain protective device of the present invention；
Fig. 4 is the signal circuit schematic diagram in the method for diagnosing faults embodiment 2 of light curtain protective device of the present invention；
Fig. 5 is the structural schematic diagram of the fault diagnosis system embodiment 1 of light curtain protective device of the present invention.
Specific implementation mode
To facilitate the understanding of the present invention, below with reference to relevant drawings to invention is more fully described.In attached drawing
Give the preferred embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, purpose of providing these embodiments is make it is more thorough and comprehensive to the disclosure.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to description tool in the description of the invention herein
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases
Any and all combinations of the Listed Items of pass.
The method for diagnosing faults embodiment 1 of light curtain protective device of the present invention：
In order to solve the problems, such as that the troubleshooting of elevator car safety is not prompt enough reliable, the present invention provides a kind of light curtains
The method for diagnosing faults embodiment 1 of protective device, Fig. 1 are the method for diagnosing faults embodiment 1 of light curtain protective device of the present invention
Flow diagram；As shown in Figure 1, may comprise steps of：
Step S110：Light curtain signal is received by the first signal circuit；
Step S120：According to light curtain signal, the luminous point occlusion state of light curtain is obtained, and according to luminous point occlusion state, judge
Light curtain whether there is failure, and when the determination result is yes, obtain light curtain fault type；
Step S130：Light curtain fault type is sent to maintenance terminal by fourth signal circuit.
In a specific embodiment, it can also include step：
According to the situation that sends and receives of light curtain signal and light curtain fault type, detection includes the first signal circuit and the
Whether the signal transduction chain road of four signal circuits is faulty；
According to testing result, link failure type is obtained；
Link failure type is sent to maintenance terminal.
Wherein, in a specific embodiment, which is that two-way signal transmits circuit.
Specifically, Fig. 2 is the signal circuit signal in the method for diagnosing faults embodiment 1 of light curtain protective device of the present invention
Figure；As shown in Fig. 2, light curtain signal passes to gate plate by " signal circuit 1 ", and plate is gated by " signal circuit 4 " by light
Curtain fault type passes to maintenance terminal；
The information that plate can be transmitted by " signal circuit 1 " is gated, the malfunction and " signal circuit of light curtain itself are diagnosed
Then 1 " malfunction is sent to maintenance terminal by " signal circuit 4 "；Wherein " signal circuit 1 ", " signal circuit 4 " are
Bi-directionally or uni-directionally signal transmission path.
Maintenance staff voluntarily can handle or get in touch with property according to the light curtain malfunction type shown in maintenance terminal
Personnel check in advance, have not only saved labour turnover but also can quickly debug in this way, restore the normal operation of elevator.
The specific embodiment of the fault detection method embodiment 1 of light curtain protective device of the present invention：
In practical operation, can respectively it be placed by the receiving terminal in light curtain close to the position of each infrared receiving tube
One light emitting diode indicates or is indicated by the altitude information of fault point the fault bit of light curtain transmitting tube, reception pipe
It sets.Whether increase diode displaying, is determined according to actual conditions.
Wherein, the distance of the minimum spot distance light curtain physical bottom of light curtain be to determine and be known, each luminous point
Between spacing be also to determine with it is known, and all luminous points are all numbered from low to high, and the state of each lamp is to know
, so the altitude information of fault point is can to calculate；And the instruction form of failure point height may include following two
Mode：1) form indicated by indicator light；2) distance is indicated by data.
The reception lamp of light curtain is encoded from top to bottom or from top to bottom, such as LED1, LED2 ... LEDn is compiled
Number；
Indicate that each luminous point is blocked or unobstructed state with 0,1, light curtain is the state of light curtain luminous point and matches
Setting some has the prefix of 0,1 combination to pass to gate plate together.
1, elevator door in off position when, gate plate judges the state of each luminous point by judging the luminous point information that receives,
If detecting that some or multiple luminous points were persistently blocked more than certain time, it is believed that luminous point damages or light curtain surface needs
Cleaning etc.；Such case is recorded as " fault type 1 "；
For fault type 1, can be indicated by the LED light in light curtain failure luminous point position or by send away from
Positional distance from light curtain bottom end indicates the position of trouble light, and whether the measure convenient for being positioned and being taken to fault point has
Effect.
If 2, gate plate within a certain period of time, can not receive the level signal of variation, illustrate output damage, " signal
The disconnection of circuit 1 ", the damage of gate plate input circuit or light curtain dead electricity etc., are recorded as " fault type 2 "；Wherein, normal communication
When, the signal that light curtain is sent to gate plate is that height changes, in the case of light curtain broken string or dead electricity, gate plate
The level signal of light curtain signal input is fixed.
If 3, elevator door is closed and is in standby, gate plate can notify light curtain to enter self-test shape
State；If transmitting tube does not send infrared light, receiving-end state is detected, if gate plate receives receiving terminal reception pipe and has conducting shape
State illustrates that light curtain luminous point itself damages, is recorded as " fault type 3 "；
4, gate plate sends light curtain fault type, and maintenance terminal is without return signal, it can be determined that exports failure for gate plate
Or " signal circuit 4 " disconnection etc., it is recorded as " fault type 4 "；
Above-mentioned fault detection method, is merely illustrative, and fault detection type is not limited to the example above.
The method for diagnosing faults embodiment 1 of the light curtain protective device of the present invention, the light curtain signal received by gating plate, is obtained
The occlusion state of luminous point is taken, and detects the fault type of light curtain according to the occlusion state of luminous point, and fault message is sent to
Maintenance terminal can be enable elevator normal operation and ensured the safety of passenger with timely and effective accurate exclusion light curtain failure.
To ensure that in the first time that failure occurs, allow maintenance staff that can obtain information.Maintenance staff can be according to gate plate
The different faults type information of transmission takes quick, effective maintenance means to find failure, debugging, it is ensured that the peace of elevator
Complete and normal use.
The method for diagnosing faults embodiment 2 of light curtain protective device of the present invention：
In order to solve the problems, such as that the troubleshooting of elevator car safety is not prompt enough reliable, the present invention also provides light curtain guarantors
The method for diagnosing faults embodiment 2 of protection unit, difference lies in provide other one between the present embodiment 2 and above-described embodiment 1
Kind signal transfer mode, to improve the accuracy and promptness of fault detection method of the present invention；Fig. 3 is light curtain of the present invention protection dress
The flow diagram for the method for diagnosing faults embodiment 2 set；As shown in figure 3, may include step：
Step S310：Light curtain signal is received by the first signal circuit；
Step S320：According to light curtain signal, the luminous point occlusion state of light curtain is obtained, and according to luminous point occlusion state, judge
Light curtain whether there is failure, and when the determination result is yes, obtain light curtain fault type；
Step S330：Light curtain fault type is sent to master control borad by second signal circuit, third is passed through by master control borad
Light curtain fault type is sent to maintenance terminal by signal circuit.
In a specific embodiment, it can also include step：
According to the situation that sends and receives of light curtain signal and light curtain fault type, detection includes the first signal circuit and the
Whether the signal transduction chain road in binary signal circuit is faulty；
According to testing result, link failure type is obtained；
Link failure type is sent to maintenance terminal.
Wherein, in a specific embodiment, second signal circuit is that two-way signal transmits circuit；Third signal returns
Road is signal transmission circuit bi-directionally or uni-directionally.
Specifically, the signal circuit signal in the method for diagnosing faults embodiment 2 of Fig. 4 light curtain protective devices of the present invention
Figure；As shown in figure 4, light curtain signal passes to gate plate by " signal circuit 1 ", gate plate is by " signal circuit 2 " by light curtain
Fault type passes to master control borad, and light curtain fault type is passed to maintenance terminal by " signal circuit 3 " by master control borad；
The information that plate can be transmitted by " signal circuit 1 " is gated, the malfunction and " signal circuit of light curtain itself are diagnosed
Then malfunction is passed to master control borad by 1 " malfunction by " signal circuit 2 ", during this, can diagnose " letter
The malfunction in number circuit 2 ", is then sent to maintenance terminal by " signal circuit 3 " by relevant fault message again.Wherein
" signal circuit 1 ", " signal circuit 2 ", " signal circuit 3 " are bi-directionally or uni-directionally signal transmission path.
Maintenance staff voluntarily can handle or get in touch with property according to the light curtain malfunction type shown in maintenance terminal
Personnel check in advance, have not only saved labour turnover but also can quickly debug in this way, restore the normal operation of elevator.
In the specific embodiment of the fault detection method embodiment 2 of light curtain protective device of the present invention, in addition to above-described embodiment 1
Described in some fault types outside, can also include：
It gates plate and sends light curtain fault type, master control borad is without return signal, it can be determined that export failure, " letter for gate plate
Number circuit 2 " or master control input fault etc., are recorded as " fault type 4 ".
The method for diagnosing faults embodiment 2 of the light curtain protective device of the present invention, the light curtain signal received by gating plate, is obtained
The occlusion state of luminous point is taken, and detects the fault type of light curtain according to the occlusion state of luminous point, and by master control borad failure
Information is sent to maintenance terminal, can be enable elevator normal operation with timely and effective accurate exclusion light curtain failure and ensured
The safety of passenger.To ensure that in the first time that failure occurs, allow maintenance staff that can obtain information.Maintenance staff can be with
According to the different faults type information that gate plate is sent, quick, effective maintenance means are taken to find failure, debugging, really
Protect the safety and normal use of elevator.
The fault diagnosis system embodiment 1 of light curtain protective device of the present invention：
In order to solve the problems, such as that the troubleshooting of elevator car safety is not prompt enough reliable, the present invention also provides light curtain guarantors
The fault diagnosis system embodiment 1 of protection unit；Fig. 5 is the knot of the fault diagnosis system embodiment 1 of light curtain protective device of the present invention
Structure schematic diagram；As shown in figure 5, may include：
Receiving unit 510, for receiving light curtain signal by the first signal circuit；
Failure judgement unit 520, for according to light curtain signal, obtaining the luminous point occlusion state of light curtain, and hide according to luminous point
Gear state judges that light curtain whether there is failure, and when the determination result is yes, obtains light curtain fault type；
Light curtain fault type is sent to maintenance terminal by transmission unit 530 for passing through fourth signal circuit.
In a specific embodiment, can also include：
First detection unit 540, for the situation that sends and receives according to light curtain signal and light curtain fault type, detection
Whether the signal transduction chain road including the first signal circuit and the fourth signal circuit is faulty；
Failure judgement unit 520 is additionally operable to the testing result according to first detection unit 540, obtains link failure type；
Transmission unit 530 is additionally operable to link failure type being sent to maintenance terminal.
In a specific embodiment, can also include：
Transmission unit 530 is used to that light curtain fault type to be sent to master control borad by second signal circuit, is led to by master control borad
It crosses third signal circuit and light curtain fault type is sent to maintenance terminal；
Second detection unit 550, for the situation that sends and receives according to light curtain signal and light curtain fault type, detection
Whether the signal transduction chain road including the first signal circuit and second signal circuit is faulty；By 520 basis of failure judgement unit
The testing result of second detection unit 550 judges the failure on signal transduction chain road, obtains link failure type；And it is single by sending
Link failure type is sent to maintenance terminal by member 530.
Specifically, the information of " signal circuit 1 " transmission can be received by receiving unit 510, pass through failure judgement list
Member 520 diagnoses the malfunction of the malfunction and " signal circuit 1 " of light curtain itself, then passes through " signal by transmission unit 530
Circuit 4 " is sent to maintenance terminal；Wherein " signal circuit 1 ", " signal circuit 4 " are bi-directionally or uni-directionally signal transmission path.
In a specific embodiment, the light transmitted by " signal circuit 1 " can also be received by receiving unit 510
Light curtain fault type is passed to master control borad by " signal circuit 2 ", passes through " signal by master control borad by curtain signal, transmission unit 530
Light curtain fault type is passed to maintenance terminal by circuit 3 "；
Failure judgement unit 520 can by " signal circuit 1 " transmit information, diagnose light curtain itself malfunction and
Then malfunction is passed to master control borad by the malfunction of " signal circuit 1 " by " signal circuit 2 ", during this, sentence
Disconnected trouble unit 520 can diagnose the malfunction of " signal circuit 2 ", then pass through " signal circuit 3 " by transmission unit 530 again
Relevant fault message is sent to maintenance terminal.Wherein " signal circuit 1 ", " signal circuit 2 ", " signal circuit 3 " are two-way
Or one way signal transmitting path.
Maintenance staff voluntarily can handle or get in touch with property according to the light curtain malfunction type shown in maintenance terminal
Personnel check in advance, have not only saved labour turnover but also can quickly debug in this way, restore the normal operation of elevator.
In practical operation, common fault type and concrete operations refer to the embodiment 1 of the method for the present invention and implement
Described in example 2.
The fault diagnosis system embodiment 1 of the light curtain protective device of the present invention, the light curtain signal received by gating plate, is obtained
The occlusion state of luminous point is taken, and detects the fault type of light curtain according to the occlusion state of luminous point, and fault message is sent to
Maintenance terminal can be enable elevator normal operation and ensured the safety of passenger with timely and effective accurate exclusion light curtain failure.
To ensure that in the first time that failure occurs, allow maintenance staff that can obtain information.Maintenance staff can be according to gate plate
The different faults type information of transmission takes quick, effective maintenance means to find failure, debugging, it is ensured that the peace of elevator
Complete and normal use.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of method for diagnosing faults of light curtain protective device, which is characterized in that include the following steps：
It gates plate and light curtain signal is received by the first signal circuit；
The gate plate obtains the luminous point occlusion state of light curtain according to the light curtain signal, and according to the luminous point occlusion state,
Judge that the light curtain whether there is failure, and when the judging result is to be, obtains light curtain fault type；
The light curtain fault type is sent to maintenance terminal by the gate plate by fourth signal circuit；The fourth signal is returned
Road is that two-way signal transmits circuit；
The light curtain fault type is sent to master control borad by the gate plate by second signal circuit, is passed through by the master control borad
The light curtain fault type is sent to maintenance terminal by third signal circuit.
2. the method for diagnosing faults of light curtain protective device according to claim 1, which is characterized in that further include step：
For the gate plate according to the situation that sends and receives of the light curtain signal and the light curtain fault type, detection includes institute
Whether the signal transduction chain road for stating the first signal circuit and the fourth signal circuit is faulty；
The gate plate obtains link failure type according to the testing result；
The link failure type is sent to the maintenance terminal by the gate plate.
3. the method for diagnosing faults of light curtain protective device according to claim 1, which is characterized in that further include step：
For the gate plate according to the situation that sends and receives of the light curtain signal and the light curtain fault type, detection includes institute
Whether the signal transduction chain road for stating the first signal circuit and the second signal circuit is faulty；
The gate plate obtains link failure type according to the testing result；
The link failure type is sent to the maintenance terminal by the gate plate.
4. the method for diagnosing faults of light curtain protective device according to claim 1 or 3, which is characterized in that second letter
Number circuit is that two-way signal transmits circuit；The third signal circuit is signal transmission circuit bi-directionally or uni-directionally.
5. a kind of fault diagnosis system of light curtain protective device, which is characterized in that including：
Plate receiving unit is gated, for receiving light curtain signal by the first signal circuit；
Plate failure judgement unit is gated, for according to the light curtain signal, obtaining the luminous point occlusion state of light curtain, and according to described
Luminous point occlusion state judges that the light curtain whether there is failure, and when the judging result is to be, obtains light curtain failure classes
Type；
Plate transmission unit is gated, the light curtain fault type is sent to maintenance terminal for passing through fourth signal circuit；It is described
Fourth signal circuit is that two-way signal transmits circuit；
Further include：
The gate plate transmission unit is additionally operable to that the light curtain fault type is sent to master control borad by second signal circuit,
The light curtain fault type is sent to by maintenance terminal by third signal circuit by the master control borad.
6. the fault diagnosis system of light curtain protective device according to claim 5, which is characterized in that further include：
Plate first detection unit is gated, for sending and receiving feelings according to the light curtain signal and the light curtain fault type
Condition, detection include whether the signal transduction chain road in first signal circuit and the fourth signal circuit is faulty；
The gate plate failure judgement unit is additionally operable to, according to the testing result of the gate plate first detection unit, obtain link
Fault type；
The gate plate transmission unit is additionally operable to the link failure type being sent to the maintenance terminal.
7. the fault diagnosis system of light curtain protective device according to claim 5, which is characterized in that
Plate second detection unit is gated, for sending and receiving feelings according to the light curtain signal and the light curtain fault type
Condition, detection include whether the signal transduction chain road in first signal circuit and the second signal circuit is faulty；By described
Plate failure judgement unit is gated according to the testing result of the gate plate second detection unit, judges the signal transduction chain road
Failure obtains link failure type；And the link failure type is sent to the maintenance by the gate plate transmission unit
Terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510711657.3A CN105197715B (en) | 2015-10-26 | 2015-10-26 | The fault diagnosis method and system of light curtain protective device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510711657.3A CN105197715B (en) | 2015-10-26 | 2015-10-26 | The fault diagnosis method and system of light curtain protective device |
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| CN105197715A CN105197715A (en) | 2015-12-30 |
| CN105197715B true CN105197715B (en) | 2018-09-21 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105502119B (en) * | 2016-01-18 | 2018-06-19 | 广州广日电梯工业有限公司 | A kind of elevator light curtain failure self checking method and device |
| CN107176532B (en) * | 2016-03-11 | 2018-12-25 | 上海三菱电梯有限公司 | The means of communication and elevator car door system control method of elevator car door system controller and intelligent door light curtain |
| CN105752790B (en) * | 2016-03-24 | 2018-10-12 | 廊坊市久联机械有限公司 | A kind of elevator governor |
| CN108128690B (en) * | 2017-12-22 | 2019-10-29 | 宁波微科光电股份有限公司 | A kind of control method slowing down the decaying of elevator light curtain transmission power |
| CN109969892A (en) * | 2019-04-01 | 2019-07-05 | 日立楼宇技术（广州）有限公司 | A kind of processing method and relevant device based on elevator light curtain |
| CN115246608B (en) * | 2022-03-22 | 2024-01-30 | 菱王电梯有限公司 | Elevator, control method, and storage medium |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186245C (en) * | 2001-01-12 | 2005-01-26 | 上海森尼电梯成套有限公司 | Infrared light curtain left door protector |
| AU2002359864A1 (en) * | 2002-12-30 | 2004-07-22 | Otis Elevator Company | Optically synchronized safety detection device for elevator sliding doors |
| CN2640996Y (en) * | 2003-07-23 | 2004-09-15 | 梯爱琼斯电梯部件(上海)有限公司 | Red infrared protector of elevator door |
| CN101670680B (en) * | 2009-09-18 | 2012-02-01 | 宁波大学 | Safety light curtain for punch and self inspection method thereof |
| CN102744346B (en) * | 2012-07-17 | 2014-04-23 | 济宁科力光电产业有限责任公司 | Dynamic self-check method of safety light curtain |
| CN202988507U (en) * | 2012-11-30 | 2013-06-12 | 广州日滨科技发展有限公司 | Light curtain control system |
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Address after: Nanxiang three road, Science City high tech Industrial Development Zone, Guangzhou city of Guangdong Province, No. 2 510660 Applicant after: Hitachi building technologies (Guangzhou) Co. Ltd. Address before: Nanxiang Road three Guangzhou Science City 510660 high tech Industrial Development Zone, Guangdong city of Guangzhou province No. 2 Applicant before: Guangzhou Ropente Science and Technology Development Co., Ltd. |
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