CN101538959A - Safety electromagnetic lock for high-voltage switchgear - Google Patents
Safety electromagnetic lock for high-voltage switchgear Download PDFInfo
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- CN101538959A CN101538959A CN200910037947A CN200910037947A CN101538959A CN 101538959 A CN101538959 A CN 101538959A CN 200910037947 A CN200910037947 A CN 200910037947A CN 200910037947 A CN200910037947 A CN 200910037947A CN 101538959 A CN101538959 A CN 101538959A
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Abstract
The invention discloses a safety electromagnetic lock for a high-voltage switchgear, which comprises a box body, lock bolt components, an electromagnetic locking mechanism, a mechanical lock plate, a stroke switch, and the like, wherein the lock bolt components, the electromagnetic locking mechanism, the mechanical lock plate, the stroke switch, and the like are respectively arranged in the box body. In the safety electromagnetic lock, the electromagnetic locking mechanism which can lock a movable bolt after being electrified is arranged in the box body, a power supply circuit of the electromagnetic locking mechanism is connected in series with an emergency unlocking button which can cut off the power supply of the power supply circuit, the mechanical lock plate is matched with the movable bolt for locking, therefore, the purpose of the invention can be achieved. The safety electromagnetic lock has simple and reasonable structure, and coils of the electromagnetic lock do not need to be electrified for a long time. On one hand, the electromagnetic lock can be only unlocked without being electrified, so that the use safety is improved. On the other hand, when the circuit of the electromagnetic lock is electrified and the electromagnetic lock needs to be unlocked emergently, a professional operator can only unlock the electromagnetic lock by pressing the emergency unlocking button for a long time and using a special key, so that the electromagnetic lock is suitable for operating requirements of different occasions, and the defects of limitations and inconvenience of the electromagnetic lock without the function of emergency unlocking in the prior art are overcome.
Description
Technical field
The present invention relates to the electromagnetic lock technical field that high voltage switchgear equipment is used, especially a kind ofly prevent the safety electric magnetic padlock high voltage switchgear equipment electric misoperation, automatically controlled, mechanical interlocking.
Background technology
Regulation according to the promulgation of department of State Grid need to install safety guard on various high-tension distribution equipments, and the electromagnetic lock that is installed on the high voltage switchgear equipment is one of safety guard; Yet the electromagnetic lock of traditional structure is subjected to its structure influence, has following several weak points in the use: the electromagnetic lock that (1) is traditional, no matter whether its circuit is charged, as long as use the private key just can release, its potential safety hazard be very big; Moreover traditional conventional electromagnetic lock and the charged display unit of pressure type are when supporting use, when being alternating current owing to general secondary power supply, all be from the high-pressure side power taking, therefore, when once charged, electromagnetic lock cannot the electrolysis lock, if when once not charged, its secondary power supply is not charged too, and therefore, electromagnetic lock still cannot be locked in electrolysis, can only be by the release of private key ability, this brings many restrictions and inconvenience to use; More have plenty of, in the existing electromagnetic lock, electromagnetic coil can be charged for a long time, causes coil to damage easily, the phenomenon of lock occurs misreading, causes poor safety performance etc.; (2) electromagnetic lock of traditional structure does not have the emergency release function, gives restriction and the inconvenience of using band how certain.
Summary of the invention
The objective of the invention is to overcome all deficiencies that exist in the above-mentioned prior art, and the safety electric magnetic padlock that provides a kind of high voltage switchgear equipment to use, this electromagnetic lock, have simple and reasonable for structure, both guaranteed when normal running, to have only that circuit is not charged can be unlocked, had the emergency release function again concurrently, and easy to use, safe, operate simple and easyly, the electromagnetic lock coil does not need long-term charged advantage.
The object of the present invention is achieved like this:
The safety electric magnetic padlock that a kind of high voltage switchgear equipment is used, comprise casing, in casing, be equiped with lock bolt components respectively, electromagnetic locking mechanism, machinery jam plate and travel switch, lock bolt components comprises movable locking bolt and back-moving spring thereof, it is spacing to be respectively arranged with lock shaft on the movable locking bolt, jam plate is spacing and spring is spacing, have on the casing can for movable locking bolt slide before, back locking bolt axis hole, the two ends of movable locking bolt be located in respectively casing before, on the back locking bolt axis hole, back-moving spring is set in movable locking bolt back segment, the holding of one end is on the spring of locking bolt is spacing, the other cabinet wall of locking bolt axis hole behind the other end Ka Ding, electromagnetic locking mechanism is mainly by the electromagnetism lock shaft, electromagnet, electromagnetic coil and power supply circuits thereof constitute, electromagnetic lock is located in the spacing position of lock shaft near movable locking bolt, so that the electromagnetism lock shaft energy holding of electromagnetic coil energising back is on lock shaft is spacing, the machinery jam plate is located near by the spacing position of jam plate of movable locking bolt, be respectively arranged with the emergency release button on the panel of casing, jam plate unlock hole and locking bolt handle, the normally closed point of emergency release button and electromagnetic coil, and be serially connected on the power supply circuits of electromagnetic locking mechanism the normal battle of travel switch, can be by pushing the power supply circuits that the emergency release button cuts off electromagnetic locking mechanism, jam plate STATEMENT OF FEDERALLY SPONSORED on the jam plate unlock hole connects mechanical jam plate, both can push down travel switch so that insert private key, with normal battle of travel switch closed, can drive mechanical jam plate by the jam plate STATEMENT OF FEDERALLY SPONSORED simultaneously again, the locking bolt handle extends in the casing and is connected with movable locking bolt.The safety electric magnetic padlock of this structure, the electromagnetic locking mechanism of the movable locking bolt of lockable when switching on by in casing, being provided with, and on the power supply circuits of electromagnetic locking mechanism, be serially connected with the emergency release button that can cut off its power on/off, the locking of cooperative mechanical jam plate and movable locking bolt again, can realize purpose of the present invention, it is simple and reasonable for structure, and the electromagnetic lock coil does not need charged for a long time; On the one hand, can guarantee that under uncharged situation, electromagnetic lock can be opened, improve the safety of using; On the other hand, when the circuit of electromagnetic lock is charged, and electromagnetic lock needs emergency release, the operating personnel of specialty can be by the long emergency release button of pressing, and just can carry out release by private key, so that electromagnetic lock is fit to the instructions for use of various different occasions, solved the electromagnetic lock of prior art, cause does not have the effect of emergency release, and brings the defective of many restrictions and inconvenience to use.
Purpose of the present invention can also adopt following technical measures to solve:
Improve as better enforcement, banking stop also is installed in the described casing, and banking stop and movable locking bolt outer wall offset, so that sliding of movable locking bolt is more steady.
For fear of maloperation, on the panel of described casing, also be provided with charged indicator lamp and misread the lock indicator lamp, charged indicator lamp is serially connected on the power supply circuits of electromagnetic locking mechanism, and normally closed point and the travel switch of misreading the lock indicator lamp electrically connect; Charged indicator lamp is bright, shows that electromagnetic lock is charged, does not allow release, and at this moment, even stir handgrip, the activity locking bolt of also not opening is even use private key also can't open; If charged indicator lamp does not work, show that electromagnetic lock is not charged, lock allows to open, at this moment, and in the unlock key insertion keyhole with special use, drive mechanical jam plate by key, the jam plate that mechanical jam plate is left on the movable locking bolt limits, and stirs handgrip then, and movable lock select is opened, when movable locking bolt retreats into the limit, can be automatically locked at lockset position of coupler; The effect of misreading the lock indicator lamp is, if electromagnetic lock is charged, when electromagnetic lock inserted key, key was directly pushed down travel switch, and it often makes war closed, misreads the lock indicator lamp and lights, and shows lock also at electriferous state, should stop unlocking operation at once.
As the concrete scheme of mechanical jam plate, described mechanical jam plate is similar to "] " shape, the jam plate STATEMENT OF FEDERALLY SPONSORED is connected the middle part of mechanical jam plate, and private key drives mechanical jam plate by the jam plate STATEMENT OF FEDERALLY SPONSORED, and the jam plate that makes the lower end of mechanical jam plate leave or snap in movable locking bolt limits.
Also be provided with handgrip on the described locking bolt handgrip and stir direction signs, stir the correct direction of handgrip with prompting operation person.
The invention has the beneficial effects as follows:
(1) safety electric magnetic padlock of the present invention, the electromagnetic locking mechanism of the movable locking bolt of lockable when switching on by in casing, being provided with, and on the power supply circuits of electromagnetic locking mechanism, be serially connected with the emergency release button that can cut off its power on/off, the locking of cooperative mechanical jam plate and movable locking bolt again, can realize purpose of the present invention, it is simple and reasonable for structure, both guaranteed when normal running, to have only that circuit is not charged can be unlocked, have the emergency release function again concurrently, and it is easy to use, safe, operate simple and easyly, electromagnetic coil does not need long-term charged advantage; During work, if circuit is charged, electromagnetic lock can only be opened mechanical jam plate by private key, but can't open electromagnetic locking mechanism, and therefore, electromagnetic lock can't release; Have only when circuit is not charged, the electromagnetic locking mechanism dead electricity, the lock shaft that its electromagnetism lock shaft leaves locking bolt is spacing, at this moment, can open mechanical jam plate by private key, then electromagnetic lock ability release, therefore, the electromagnetic lock of this structure can guarantee under uncharged situation, can be opened, improve the safety of using; Perhaps, when circuit is charged, and electromagnetic lock needs emergency release, the operating personnel of specialty can press the emergency release button by long, make electromagnetic locking mechanism keep dead electricity, and just can carry out release by private key, so that electromagnetic lock is fit to the instructions for use of various different occasions, solve the electromagnetic lock of prior art, because of not having the effect of emergency release, and brought the defective of many restrictions and inconvenience to use;
(2) have " charged " and dual signs such as " misreading lock " on the electromagnetic lock panel, reduced the possibility of maloperation, avoid electromagnetic lock to damage easily because of maloperation.
Description of drawings
Fig. 1 is that electromagnetic lock of the present invention is mechanical jam plate pinning activity locking bolt view;
Fig. 2 be electromagnetic lock of the present invention be circuit when charged the electromagnetic lock shaft lock live movable locking bolt view;
Fig. 3 is that electromagnetic lock of the present invention is circuit released state schematic diagram when not charged;
Fig. 4 is that electromagnetic lock of the present invention is circuit emergency release view when charged;
Fig. 5 is an electromagnetic lock casing front view of the present invention.
The specific embodiment
Extremely shown in Figure 5 as Fig. 1, the safety electric magnetic padlock that a kind of high voltage switchgear equipment is used, comprise casing 1, in casing 1, be equiped with lock bolt components 2 respectively, electromagnetic locking mechanism 3, machinery jam plate 4, travel switch 5 and banking stop 9, lock bolt components 2 comprises movable locking bolt 201 and back-moving spring 202 thereof, be respectively arranged with the spacing 201a of lock shaft on the movable locking bolt 201, spacing 201b of jam plate and the spacing 201c of spring, have on the casing 1 can for movable locking bolt 201 slide before, back locking bolt axis hole 101,102, the two ends of movable locking bolt 201 be located in respectively casing before, back locking bolt axis hole 101, on 102, back-moving spring 202 is set in movable locking bolt 201 back segments, the holding of one end is on the spacing 201c of the spring of locking bolt, casing 1 inwall on locking bolt axis hole 102 sides behind the other end Ka Ding, banking stop 9 offsets with movable locking bolt 201 outer walls, electromagnetic locking mechanism 3 is mainly by electromagnetism lock shaft 301, electromagnet 302, electromagnetic coil and power supply circuits 303 thereof constitute, electromagnetism lock shaft 301 is located at the spacing 201a of the lock shaft position near movable locking bolt 201, so that the electromagnetism lock shaft 301 energy holdings of electromagnetic coil energising back are on the spacing 201a of lock shaft, machinery jam plate 4 approximate "] " shape, and be located near by the spacing 201b of the jam plate position of movable locking bolt 201, be respectively arranged with emergency release button 6 on the panel of casing 1, jam plate unlock hole 7 and locking bolt handle 8, normally closed some K1 of emergency release button 6 and electromagnetic coil, K2 (not looking out), and normal K3 battle (not looking out) of travel switch 5 is serially connected on the power supply circuits 303 of electromagnetic locking mechanism 3, can be by pushing the power supply circuits 303 that emergency release button 6 cuts off electromagnetic locking mechanism, jam plate STATEMENT OF FEDERALLY SPONSORED 701 on the jam plate unlock hole 7 connects the middle part of mechanical jam plate 4, both can push down travel switch 5 so that insert private key, that is: push down the travel switch pressing plate 501 shown in the figure, normal battle of K3 closure with travel switch 5, can drive mechanical jam plate 4 by jam plate STATEMENT OF FEDERALLY SPONSORED 701 simultaneously again, locking bolt handle 8 extends in the casing 1 and is connected with movable locking bolt 201.
Also be provided with charged indicator lamp 10 on the panel of described casing 1 and misread lock indicator lamp 11, charged indicator lamp 10 is serially connected on the power supply circuits 303 of electromagnetic locking mechanism, normally closed point and the travel switch 5 of misreading lock indicator lamp 11 electrically connect, and also are provided with handgrip on the described locking bolt handgrip 8 and stir direction signs 801.
The various state operating principles of Fig. 1 to Fig. 4 are as follows:
As shown in Figure 1, be that electromagnetic lock is the charged time machinery jam plate of a circuit pinning activity locking bolt view, this state is because circuit is not charged, the electromagnetic locking mechanism dead electricity, the electromagnetism lock shaft is static, has only the jam plate on the mechanical jam plate locking activity locking bolt spacing, and movable locking bolt is in the lock state;
As shown in Figure 2, be electromagnetic lock be circuit when charged the electromagnetic lock shaft lock live movable locking bolt view, this state is because circuit is charged, at this moment, even the insertion private key, key is pushed down travel switch and is often made war, and makes its closure, electromagnetic locking mechanism gets, electromagnetism lock shaft action and holding are on the lock shaft of movable locking bolt is spacing, though the key rotation, to leave the jam plate of movable locking bolt spacing can drive mechanical jam plate, but movable locking bolt is limited by the electromagnetism lock shaft still, and movable locking bolt is in the lock state; That is: when normally using, electromagnetic lock is charged, even use the private key can not release;
As shown in Figure 3, be that electromagnetic lock is circuit released state schematic diagram when not charged, this state is because circuit is not charged, during release, insert jam plate unlock hole 7 by private key, at this moment, even push down travel switch, make its normal closure of making war, but because circuit is not charged, therefore, the electromagnetic locking mechanism dead electricity, it is spacing to make the electromagnetism lock shaft leave the lock shaft of movable locking bolt all the time, the private key rotation, making jam plate STATEMENT OF FEDERALLY SPONSORED 701 drive mechanical jam plate, to leave the jam plate of movable locking bolt spacing, is in released state that is:; That is: just often, electromagnetic lock is not charged, can pass through the private key release;
As shown in Figure 4, electromagnetic lock is circuit emergency release view when charged, this principle is, the operator presses the emergency release button for a long time, and rotate by private key, at this moment, even key is pushed down travel switch, make its normal closure of making war, but, make the temporary transient dead electricity of electromagnetic locking mechanism because the normally closed point of emergency release button disconnects, it is spacing that the electromagnetism lock shaft leaves the lock shaft of movable locking bolt, in key when rotation,, to make mechanical jam plate leave the jam plate of movable locking bolt spacing by driving jam plate STATEMENT OF FEDERALLY SPONSORED 701, realizes the emergency release effect; That is: the circuit of electromagnetic lock is charged, and electromagnetic lock needs emergency release, and the operating personnel of specialty can press the emergency release button by long, and just can carry out release by private key, so that electromagnetic lock is fit to the instructions for use of various different occasions.
Eventually the above, electromagnetic lock of the present invention has simple and reasonable for structurely, has both guaranteed when normal operating Only have that circuit is not charged can be unlocked, have again the emergency release function concurrently, and easy to use, safe, behaviour Do simple and easyly, the electromagnetic lock coil does not need long-term charged advantage.
Claims (5)
1. safety electric magnetic padlock that high voltage switchgear equipment is used, comprise casing (1), it is characterized in that, in casing (1), be equiped with lock bolt components (2) respectively, electromagnetic locking mechanism (3), machinery jam plate (4) and travel switch (5), lock bolt components (2) comprises movable locking bolt (201) and back-moving spring (202) thereof, be respectively arranged with lock shaft spacing (201a) on the movable locking bolt (201), jam plate spacing (201b) and spring spacing (201c), have on the casing (1) can for movable locking bolt (201) slide before, back locking bolt axis hole (101,102), the two ends of movable locking bolt (201) be located in respectively casing before, back locking bolt axis hole (101,102) on, back-moving spring (202) is set in movable locking bolt (201) back segment, the holding of one end is on the spring of locking bolt spacing (201c), other casing (1) inwall of locking bolt axis hole (102) behind the other end Ka Ding, electromagnetic locking mechanism (3) is mainly by electromagnetism lock shaft (301), electromagnet (302), electromagnetic coil and power supply circuits thereof (303) constitute, electromagnetism lock shaft (301) is located at lock shaft spacing (201a) position near movable locking bolt (201), so that the holding of electromagnetic coil energising back electromagnetism lock shaft (301) energy is on lock shaft spacing (201a), machinery jam plate (4) is located near by jam plate spacing (201b) position of movable locking bolt (201), be respectively arranged with emergency release button (6) on the panel of casing (1), jam plate unlock hole (7) and locking bolt handle (8), normally closed some K1 of emergency release button (6) and electromagnetic coil, K2, and normal battle of the K3 of travel switch (5) is serially connected on the power supply circuits (303) of electromagnetic locking mechanism (3), can be by pushing the power supply circuits (303) that emergency release button (6) cuts off electromagnetic locking mechanism, jam plate STATEMENT OF FEDERALLY SPONSORED (701) on the jam plate unlock hole (7) connects mechanical jam plate (4), both can push down travel switch (5) so that insert private key, normal battle of K3 closure with travel switch (5), can drive mechanical jam plate (4) by jam plate STATEMENT OF FEDERALLY SPONSORED (701) simultaneously again, locking bolt handle (8) extends in the casing (1) and is connected with movable locking bolt (201).
2. the safety electric magnetic padlock of using according to the described high voltage switchgear equipment of claim 1 is characterized in that, banking stop (9) also is installed in the described casing (1), and banking stop (9) offsets with movable locking bolt (201) outer wall.
3. the safety electric magnetic padlock of using according to claim 1 or 2 described high voltage switchgear equipments, it is characterized in that, also be provided with charged indicator lamp (10) on the panel of described casing (1) and misread lock indicator lamp (11), charged indicator lamp (10) is serially connected on the power supply circuits (303) of electromagnetic locking mechanism, and normally closed point and the travel switch (5) of misreading lock indicator lamp (11) electrically connect.
4. the safety electric magnetic padlock of using according to claim 1 or 2 described high voltage switchgear equipments is characterized in that described mechanical jam plate (4) is similar to "] " shape, jam plate STATEMENT OF FEDERALLY SPONSORED (701) is connected the middle part of mechanical jam plate (4).
5. the safety electric magnetic padlock of using according to the described high voltage switchgear equipment of claim 1 is characterized in that, also is provided with handgrip on the described locking bolt handgrip (8) and stirs direction signs (801).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100379479A CN101538959B (en) | 2009-03-17 | 2009-03-17 | Safety electromagnetic lock for high-voltage switchgear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100379479A CN101538959B (en) | 2009-03-17 | 2009-03-17 | Safety electromagnetic lock for high-voltage switchgear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101538959A true CN101538959A (en) | 2009-09-23 |
| CN101538959B CN101538959B (en) | 2011-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100379479A Expired - Fee Related CN101538959B (en) | 2009-03-17 | 2009-03-17 | Safety electromagnetic lock for high-voltage switchgear |
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| CN (1) | CN101538959B (en) |
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| CN101864872A (en) * | 2010-06-11 | 2010-10-20 | 镇江泰源电器科技有限公司 | Noiseless electromagnetic lock for preventing misoperation of high-pressure switchgear |
| CN101881098A (en) * | 2010-06-11 | 2010-11-10 | 镇江泰源电器科技有限公司 | Electromagnetic lock for preventing misoperation of high-voltage switch equipment |
| CN101915023A (en) * | 2010-06-22 | 2010-12-15 | 吴斐 | Power supply door lock device |
| CN102800510A (en) * | 2012-08-21 | 2012-11-28 | 镇江华驰电器有限公司 | Outdoor small-sized electric locking device |
| CN102881485A (en) * | 2012-10-31 | 2013-01-16 | 镇江华驰电器有限公司 | Program electromagnetic switch lock |
| CN105279826A (en) * | 2015-09-17 | 2016-01-27 | 深圳市金航标电子有限公司 | Beidou positioning communication-based intelligent container electronic lock and locking and unlocking method |
| CN107355173A (en) * | 2017-08-31 | 2017-11-17 | 中铁第四勘察设计院集团有限公司 | Protection door system before a kind of rail of track traffic section |
| CN107816259A (en) * | 2017-11-20 | 2018-03-20 | 江苏通鼎宽带有限公司 | The network control of RFID intelligence is locked |
| WO2018149379A1 (en) * | 2017-02-20 | 2018-08-23 | 新华三技术有限公司 | Ap device, internet-of-things device, and communication device |
| CN108759229A (en) * | 2018-06-06 | 2018-11-06 | 常熟格林电器科技有限公司 | Shared cold storage plant |
| CN112234459A (en) * | 2020-11-11 | 2021-01-15 | 国网山东省电力公司青岛供电公司 | External electrified blocking device of box electrical equipment and box electrical equipment |
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| EP1180744A1 (en) * | 2000-08-18 | 2002-02-20 | Dätwyler Ag Schweizerische Kabel-, Gummi- Und Kunststoffwerke | Cabinet, in particular switching-, computer-, or appliance-cabinet; remotely controlled door unlocking system; and bolt mechanisms for a door |
| CN2477772Y (en) * | 2001-05-15 | 2002-02-20 | 镇江市电工器材厂 | Electromagnetic controlled lock having mechanical program key |
| CN2518975Y (en) * | 2001-12-03 | 2002-10-30 | 孔洁 | Electromagnetic lock |
| CN2908707Y (en) * | 2006-05-24 | 2007-06-06 | 衢州市申源电器有限公司 | Safety locking device for indoor high tension switch cabinet |
| CN201428301Y (en) * | 2009-03-17 | 2010-03-24 | 陈有明 | Safety type electromagnetic lock for high-voltage switch equipment |
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| CN101864872A (en) * | 2010-06-11 | 2010-10-20 | 镇江泰源电器科技有限公司 | Noiseless electromagnetic lock for preventing misoperation of high-pressure switchgear |
| CN101881098A (en) * | 2010-06-11 | 2010-11-10 | 镇江泰源电器科技有限公司 | Electromagnetic lock for preventing misoperation of high-voltage switch equipment |
| CN101881098B (en) * | 2010-06-11 | 2012-05-30 | 镇江泰源电器科技有限公司 | Electromagnetic lock for preventing misoperation of high-voltage switch equipment |
| CN101864872B (en) * | 2010-06-11 | 2012-12-19 | 镇江泰源电器科技有限公司 | Noiseless electromagnetic lock for preventing misoperation of high-pressure switchgear |
| CN101915023A (en) * | 2010-06-22 | 2010-12-15 | 吴斐 | Power supply door lock device |
| CN102800510A (en) * | 2012-08-21 | 2012-11-28 | 镇江华驰电器有限公司 | Outdoor small-sized electric locking device |
| CN102800510B (en) * | 2012-08-21 | 2015-04-08 | 镇江华驰电器有限公司 | Outdoor small-sized electric locking device |
| CN102881485A (en) * | 2012-10-31 | 2013-01-16 | 镇江华驰电器有限公司 | Program electromagnetic switch lock |
| CN105279826A (en) * | 2015-09-17 | 2016-01-27 | 深圳市金航标电子有限公司 | Beidou positioning communication-based intelligent container electronic lock and locking and unlocking method |
| CN105279826B (en) * | 2015-09-17 | 2018-01-02 | 深圳市金航标电子有限公司 | A kind of intelligent container electronic lock and its plus unlocking method based on Big Dipper positioning and communicating |
| WO2018149379A1 (en) * | 2017-02-20 | 2018-08-23 | 新华三技术有限公司 | Ap device, internet-of-things device, and communication device |
| US11134541B2 (en) | 2017-02-20 | 2021-09-28 | New H3C Technologies Co., Ltd. | AP device, IoT device, and communication device |
| CN107355173A (en) * | 2017-08-31 | 2017-11-17 | 中铁第四勘察设计院集团有限公司 | Protection door system before a kind of rail of track traffic section |
| CN107816259A (en) * | 2017-11-20 | 2018-03-20 | 江苏通鼎宽带有限公司 | The network control of RFID intelligence is locked |
| CN108759229A (en) * | 2018-06-06 | 2018-11-06 | 常熟格林电器科技有限公司 | Shared cold storage plant |
| CN108759229B (en) * | 2018-06-06 | 2023-10-20 | 江苏格林电器有限公司 | Shared refrigerating device |
| CN112234459A (en) * | 2020-11-11 | 2021-01-15 | 国网山东省电力公司青岛供电公司 | External electrified blocking device of box electrical equipment and box electrical equipment |
| CN112234459B (en) * | 2020-11-11 | 2023-02-28 | 国网山东省电力公司青岛供电公司 | External electrified locking device of box electrical equipment and box electrical equipment |
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| CN101538959B (en) | 2011-07-20 |
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