CN112153850A - Security protection power supply unit - Google Patents
Security protection power supply unit Download PDFInfo
- Publication number
- CN112153850A CN112153850A CN202011026900.5A CN202011026900A CN112153850A CN 112153850 A CN112153850 A CN 112153850A CN 202011026900 A CN202011026900 A CN 202011026900A CN 112153850 A CN112153850 A CN 112153850A
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- plate
- ring
- block
- voltage stabilizing
- power supply
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1401—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1438—Back panels or connecting means therefor; Terminals; Coding means to avoid wrong insertion
- H05K7/1457—Power distribution arrangements
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Magnetic Treatment Devices (AREA)
Abstract
The invention discloses security protection power supply equipment which structurally comprises a protective shell, a heat dissipation port, a control panel and a wiring board, wherein the back surface of the protective shell is welded and connected with the front surface of the wiring board, the heat dissipation port and the front surface of the protective shell are integrally formed, the bottom surface of the control panel is embedded into the top surface of the protective shell, a voltage stabilizing block is arranged in a special embedding seat, when the voltage stabilizing block is damaged, the voltage stabilizing block is popped up by repulsive magnetic force, meanwhile, the emergency clamping plates are mutually touched, and the same resistance as the voltage stabilizing block is provided, the circuit path is kept, the same current consumption as that under normal conditions is kept, the reduction of the service life of a load caused by the impact of suddenly increased current on other circuits is avoided, meanwhile, the emergency clamping plate cannot be popped up under normal conditions through the stable supporting column, and the stability of the emergency splint is kept under the emergency situation, and the situation that the emergency splint returns to the groove of the nesting seat again to cause connection failure is avoided.
Description
Technical Field
The invention relates to the field of security, in particular to security power supply equipment.
Background
Power supply equipment can carry out intelligent management to electrical power generating system and battery reliably, and monitor and control at the remote end, in the security protection system, often can come to supply power to the security protection watch-dog through power supply equipment, a power supply equipment often needs to provide the power to a plurality of security protection equipment, in order to make the voltage invariable, therefore battery and electronic component in the power supply equipment adopt the mode of connecting in parallel, make the voltage on each branch road equal, consequently make security protection equipment on each circuit have sufficient voltage to carry out normal work, but once the electronic component of installing on a certain circuit is destroyed, make this circuit open circuit, other circuits will lead to the electric current grow because of reducing a load suddenly, too big electric current can lead to other loads to receive the current rush in the twinkling of an eye and reduce life, the risk that the burn even appears.
Disclosure of Invention
In order to solve the problems, the invention provides security protection power supply equipment.
In order to achieve the purpose, the invention is realized by the following technical scheme: a security protection power supply device structurally comprises a protective shell, a heat dissipation port, a control panel and a wiring board, wherein the back surface of the protective shell is connected with the front surface of the wiring board in a welding mode, the heat dissipation port and the front surface of the protective shell are integrally formed, and the bottom surface of the control panel is embedded into the top surface of the protective shell; the wiring board includes battery, plate body, wiring block, connecting wire, stabiliser, battery back fixed mounting is openly in the plate body, the wiring block back welds in the plate body openly, the battery right side is passed through the connecting wire and is connected on the left of the wiring block, the stabiliser outer loop imbeds in the connecting wire middle section, the connecting wire is equipped with a plurality ofly, a plurality of connecting wire clearance looks isosmosis in the wiring block left side.
Furthermore, the voltage stabilizer comprises an embedded seat, a voltage stabilizing block, a magnetic joint, an emergency clamping plate and an electromagnet, wherein an inner ring of the embedded seat is in transitional connection with an outer ring of the voltage stabilizing block, the top surface of the magnetic joint is welded on the bottom surface of the voltage stabilizing block, the bottom of the emergency clamping plate is movably clamped with the inner ring of the embedded seat, the electromagnet is embedded into the embedded seat, one side of the emergency clamping plate is in surface contact with the outer ring of the magnetic joint, and the magnetism of the magnetic joint is the same as that of the electromagnet generated after the electromagnet is.
Furthermore, the emergency splint comprises a plate, a resistor head, an electricity receiving block, a stabilizing support column and a boosting ring, wherein the top surface of the plate is connected with the bottom surface of the resistor head in a welding mode, the electricity receiving block is embedded into the right side of the plate, the right end of the stabilizing support column is welded on the left side of the plate, the outer ring of the boosting ring is fixedly connected with the bottom of the plate, and the resistor head is of a triangular structure.
Furthermore, the boosting ring comprises a ring body, a pressing handle, a spring, a top plate and an inner column, wherein the inside of the ring body is fixedly connected with the left side of the spring, the bottom of the pressing handle is welded with the outer ring of the inner column, the inner ring of the ring body is connected with the outer ring of the inner column through the top plate, the top of the pressing handle is in surface contact with the left side of the spring, and the pressing handle is of an arc-shaped block structure and is made of polystyrene materials.
Furthermore, the stabilizing support column comprises a top rod, a support plate, an arc-shaped plate and two support springs, wherein the left side of the top rod is movably clamped with the bottom of the support plate, one end of the arc-shaped plate is fixedly connected with one side of the support plate, one end of each support spring is welded with one side of the support plate, and the two support plates are distributed on the upper side and the lower side of the left side of the top rod in a mirror image mode.
Furthermore, the supporting plate comprises an outer plate, a rotating wheel, a winding shaft, a rope and an extending block, the bottom of the outer plate is connected with the outer ring of the rotating wheel in a welded mode, the inner ring of the winding shaft is fixedly installed inside the rotating wheel, the outer ring of the winding shaft is connected with the bottom of the extending block through the rope, one side of the extending block is connected with the inside of the outer plate in a transition mode, and the rope is made of a steel cable.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the voltage stabilizing block is arranged in the special nested seat, when the voltage stabilizing block is damaged, the voltage stabilizing block is popped out through repulsive magnetic force, the emergency clamping plates are mutually touched, the resistor identical to the voltage stabilizing block is provided, the circuit path of the line is maintained, the current consumption identical to that under the normal condition is maintained, the reduction of the load service life caused by the sudden increased current impact on other circuits is avoided, meanwhile, the emergency clamping plate cannot be popped out through the stable supporting column under the normal condition, the stability of the emergency clamping plate is maintained under the emergency condition, and the connection failure caused by the emergency clamping plate returning to the groove of the nested seat again is avoided.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a security power supply device of the present invention.
Fig. 2 is a front view of the wiring board of the present invention.
FIG. 3 is a schematic top view of a cross-section of a regulator according to the present invention.
Fig. 4 is a schematic structural view of a front cross section of the emergency splint of the present invention.
Fig. 5 is a schematic structural diagram of an elevational cross section of the booster ring of the present invention.
Fig. 6 is a schematic structural view of a front cross section of the stabilizing support column of the present invention.
Fig. 7 is a schematic structural view of a front cross section of the support plate of the present invention.
In the figure: a protective shell-1, a heat dissipation port-2, a control panel-3, a wiring board-4, a battery-41, a board body-42, a wiring block-43, a connecting wire-44, a voltage stabilizer-45, a nesting seat-451, a voltage stabilizing block-452, a magnetic joint-453, an emergency splint-454, an electromagnet-455, a plate-A1, a resistor head-A2 and an electric connection block-A3, the device comprises a stable supporting column-A4, a boosting ring-A5, a ring body-A51, a pressing handle-A52, a spring-A53, a top plate-A54, an inner column-A55, a mandril-A41, a supporting plate-A42, an arc-shaped plate-A43, a supporting spring-A44, an outer plate-B1, a rotating wheel-B2, a winding shaft-B3, a rope-B4 and an extending block-B5.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The first embodiment is as follows:
referring to fig. 1-5, the embodiments of the present invention are as follows: a security protection power supply device structurally comprises a protective shell 1, a heat dissipation port 2, a control panel 3 and a wiring board 4, wherein the back surface of the protective shell 1 is connected with the front surface of the wiring board 4 in a welding mode, the heat dissipation port 2 and the front surface of the protective shell 1 are integrally formed, and the bottom surface of the control panel 3 is embedded into the top surface of the protective shell 1; wiring board 4 includes battery 41, plate body 42, junction block 43, connecting wire 44, stabiliser 45, battery 41 back fixed mounting is openly in plate body 42, junction block 43 back welds in plate body 42 openly, battery 41 right side is passed through connecting wire 44 and is connected on the left of junction block 43, stabiliser 45 outer ring is embedded in connecting wire 44 middle section, connecting wire 44 is equipped with a plurality ofly, and a plurality of connecting wire 44 clearance looks isosmosis are in junction block 43 left sides, are favorable to increasing the security protection equipment quantity that can insert simultaneously.
The voltage stabilizer 45 comprises a nesting seat 451, a voltage stabilizing block 452, a magnetic joint 453, an emergency clamping plate 454 and an electromagnet 455, wherein the inner ring of the nesting seat 451 is in transitional connection with the outer ring of the voltage stabilizing block 452, the top surface of the magnetic joint 453 is welded on the bottom surface of the voltage stabilizing block 452, the bottom of the emergency clamping plate 454 is movably clamped with the inner ring of the nesting seat 451, the electromagnet 455 is embedded in the nesting seat 451, one side of the emergency clamping plate 454 is in contact with the surface of the outer ring of the magnetic joint 453, and the magnetism of the magnetic joint 453 is the same as that generated after the electromagnet 455 is electrified, so that the voltage stabilizing block 452 can be ejected out by homopolar repulsion.
The emergency splint 454 comprises a plate A1, a resistor head A2, an electricity connection block A3, a stable support column A4 and a boosting ring A5, wherein the top surface of the plate A1 is welded with the bottom surface of the resistor head A2, the electricity connection block A3 is embedded into the right side of the plate A1, the right end of the stable support column A4 is welded on the left side of the plate A1, the outer ring of the boosting ring A5 is fixedly connected with the bottom of the plate A1, and the resistor head A2 is of a triangular structure, so that stronger stability is generated when the plates are overlapped with one another, and the plates are not easy to slide.
The boosting ring A5 comprises a ring body A51, a pressing handle A52, a spring A53, a top plate A54 and an inner column A55, the inside of the ring body A51 is fixedly connected with the left side of the spring A52, the bottom of the pressing handle A52 is connected with the outer ring of the inner column A55 in a welding mode, the inner ring of the ring body A51 is connected with the outer ring of the inner column A55 through the top plate A54, the top of the pressing handle A52 is in contact with the left side surface of the spring A53, the pressing handle A52 is of an arc-shaped block structure and is made of polystyrene materials, and the pushing ring A5 has certain elasticity and is beneficial to being capable of continuously slightly pressing down when the spring A53 is pressed to the bottom and simultaneously.
Based on the above embodiment, the specific working principle is as follows: under normal conditions, the electric connection block A3 on the emergency splint 454 is in contact with the magnetic connection terminal 453, the current output from the battery 41 is output from the magnetic connection terminal 453 to the electric connection block A3, then the current is sent into the boosting ring A5 to pass through the ring body A51 and the top plate A54 of the boosting ring A5, passes through the inner column A55 and then flows out from the ring body A51 at the other end, because the electromagnet 455 has large resistance, all the current can be directly consumed, therefore, the current can not pass through the electromagnet 455, when the voltage stabilizing block 452 is damaged, the voltage stabilizing block 452 is in an open circuit, therefore, the electric connection block A3 connected with the magnetic connection terminal 453 at the bottom of the voltage stabilizer can not pass through any current any more, because of the open circuit, the current can completely flow into the electromagnet 455 to generate magnetic force, the magnetic connection terminal 453 is ejected out to drive the voltage stabilizing block 452 to eject out, at this time, because the limit of the voltage stabilizing block 452 is lost, the emergency splint 454 pulls out the stabilizing support column A4 from the, and direct conduction is carried out through the contact of the two resistor heads A2, and a certain resistor is attached to the resistor head A2, so that the current impact of other circuits is suddenly increased due to the change of the whole load while the contact is avoided, the circuits can be still communicated while the voltage stabilizing block 452 is damaged, and other parallel circuits cannot be influenced.
Example two:
referring to fig. 1-7, the embodiments of the present invention are as follows: a security protection power supply device structurally comprises a protective shell 1, a heat dissipation port 2, a control panel 3 and a wiring board 4, wherein the back surface of the protective shell 1 is connected with the front surface of the wiring board 4 in a welding mode, the heat dissipation port 2 and the front surface of the protective shell 1 are integrally formed, and the bottom surface of the control panel 3 is embedded into the top surface of the protective shell 1; wiring board 4 includes battery 41, plate body 42, junction block 43, connecting wire 44, stabiliser 45, battery 41 back fixed mounting is openly in plate body 42, junction block 43 back welds in plate body 42 openly, battery 41 right side is passed through connecting wire 44 and is connected on the left of junction block 43, stabiliser 45 outer ring is embedded in connecting wire 44 middle section, connecting wire 44 is equipped with a plurality ofly, and a plurality of connecting wire 44 clearance looks isosmosis are in junction block 43 left sides, are favorable to increasing the security protection equipment quantity that can insert simultaneously.
The voltage stabilizer 45 comprises a nesting seat 451, a voltage stabilizing block 452, a magnetic joint 453, an emergency clamping plate 454 and an electromagnet 455, wherein the inner ring of the nesting seat 451 is in transitional connection with the outer ring of the voltage stabilizing block 452, the top surface of the magnetic joint 453 is welded on the bottom surface of the voltage stabilizing block 452, the bottom of the emergency clamping plate 454 is movably clamped with the inner ring of the nesting seat 451, the electromagnet 455 is embedded in the nesting seat 451, one side of the emergency clamping plate 454 is in contact with the surface of the outer ring of the magnetic joint 453, and the magnetism of the magnetic joint 453 is the same as that generated after the electromagnet 455 is electrified, so that the voltage stabilizing block 452 can be ejected out by homopolar repulsion.
The emergency splint 454 comprises a plate A1, a resistor head A2, an electricity connection block A3, a stable support column A4 and a boosting ring A5, wherein the top surface of the plate A1 is welded with the bottom surface of the resistor head A2, the electricity connection block A3 is embedded into the right side of the plate A1, the right end of the stable support column A4 is welded on the left side of the plate A1, the outer ring of the boosting ring A5 is fixedly connected with the bottom of the plate A1, and the resistor head A2 is of a triangular structure, so that stronger stability is generated when the plates are overlapped with one another, and the plates are not easy to slide.
The boosting ring A5 comprises a ring body A51, a pressing handle A52, a spring A53, a top plate A54 and an inner column A55, the inside of the ring body A51 is fixedly connected with the left side of the spring A52, the bottom of the pressing handle A52 is connected with the outer ring of the inner column A55 in a welding mode, the inner ring of the ring body A51 is connected with the outer ring of the inner column A55 through the top plate A54, the top of the pressing handle A52 is in contact with the left side surface of the spring A53, the pressing handle A52 is of an arc-shaped block structure and is made of polystyrene materials, and the pushing ring A5 has certain elasticity and is beneficial to being capable of continuously slightly pressing down when the spring A53 is pressed to the bottom and simultaneously.
Wherein, stabilizing support post A4 includes ejector pin A41, backup pad A42, arc A43, supports spring A44, ejector pin A41 left side and backup pad A42 bottom activity block, arc A43 one end and backup pad A42 one side fixed connection, support spring A44 one end and backup pad A42 one side welded connection, backup pad A2 is equipped with two, and two backup pad A2 mirror image distributions are two about ejector pin A41 left side, are favorable to fixed urgent splint 454 and can not make it pop out under normal conditions.
The supporting plate A42 comprises an outer plate B1, a rotating wheel B2, a winding shaft B3, a rope B4 and an extending block B5, the bottom of the outer plate B1 is connected with the outer ring of the rotating wheel B2 in a welding mode, the inner ring of the winding shaft B3 is fixedly installed inside a rotating wheel B2, the outer ring of the winding shaft B3 is connected with the bottom of the extending block B5 through a rope B4, one side of the extending block B5 is connected with the inner portion of the outer plate B1 in a transition mode, the rope B4 is made of steel cables, certain rigidity is achieved, and the extending block B5 can be ejected out after extending.
Based on the above embodiment, the specific working principle is as follows: under normal conditions, the stable supporting column A4 is inserted into the slot of the nesting seat 451, so when the stable supporting column A4 is inserted into the slot, the arc plate A43 abuts against the innermost side of the slot and expands, the back surface of the outer plate B1 of the supporting plate A42 abuts against the thinner part of the slot, meanwhile, the shape is kept unchanged by the supporting spring A44 arranged between the arc plate A43 and the two arc plates A43, the situation that the emergency splint 454 is ejected due to the retraction of the supporting plate A42 caused by slight shaking is avoided, the normal condition is more stable, after the voltage stabilizer 452 is damaged, the voltage stabilizer 452 is ejected, therefore, under the action of the boosting ring A5, the supporting plate A43 receives a force which is several times stronger than the ordinary shaking, the supporting spring A44 and the arc plate A43 are compressed, the width is reduced, the width can slide outwards abutting against the wall of the slot of the nesting seat 451, and the rope B4 is rolled by the rolling shaft B3 due to being retracted inwards, so that the extended outer plate B8536 is pulled into the outer plate 1, after slipping out, under the combined action of the supporting spring A44 and the arc-shaped plate A43, the rotating wheel B2 and the winding shaft B3 reversely rotate, the outer plate B1 is opened, the outer plate B1 is restored to the previous state again, meanwhile, the rope B4 is discharged, the steel cable has certain rigidity, the extending block B5 is ejected out, the extending block B5 is attached to the inner ring surface of the nesting seat 451 after being ejected out, front and back shaking is avoided, the outer plate B1 abuts against the inner ring surface of the nesting seat 451, and left and right shaking is avoided, and the emergency splint 454 is connected more stably in an emergency.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides a security protection power supply unit, its structure includes protective housing (1), thermovent (2), control panel (3), wiring board (4), its characterized in that:
the back surface of the protective shell (1) is connected with the front surface of the wiring board (4) in a welding mode, the heat dissipation port (2) and the front surface of the protective shell (1) are integrally formed, and the bottom surface of the control panel (3) is embedded into the top surface of the protective shell (1);
wiring board (4) are including battery (41), plate body (42), junction block (43), connecting wire (44), stabiliser (45), battery (41) back fixed mounting is openly in plate body (42), junction block (43) back welds in plate body (42) openly, battery (41) right side is passed through connecting wire (44) and is connected with junction block (43) left side, stabiliser (45) outer loop is embedded in connecting wire (44) middle section.
2. The security power supply device according to claim 1, wherein: the voltage stabilizer (45) comprises a nested seat (451), a voltage stabilizing block (452), a magnetic joint (453), an emergency clamping plate (454) and an electromagnet (455), wherein the inner ring of the nested seat (451) is in transitional connection with the outer ring of the voltage stabilizing block (452), the top surface of the magnetic joint (453) is welded on the bottom surface of the voltage stabilizing block (452), the bottom of the emergency clamping plate (454) is movably clamped with the inner ring of the nested seat (451), the electromagnet (455) is embedded in the nested seat (451), and one side of the emergency clamping plate (454) is in surface contact with the outer ring of the magnetic joint (453).
3. The security power supply device according to claim 2, wherein: urgent splint (454) include plate (A1), resistance head (A2), connect electric block (A3), stabilize support column (A4), boost ring (A5), plate (A1) top surface and resistance head (A2) bottom surface welded connection, connect electric block (A3) to imbed in plate (A1) right side, stabilize support column (A4) right end and weld in plate (A1) left side, boost ring (A5) outer loop and plate (A1) bottom fixed connection.
4. The security power supply device according to claim 3, wherein: the boosting ring (A5) comprises a ring body (A51), a pressing handle (A52), a spring (A53), a top plate (A54) and an inner column (A55), the ring body (A51) is internally and fixedly connected with the left side of the spring (A52), the bottom of the pressing handle (A52) is connected with the outer ring of the inner column (A55) in a welded mode, the ring body (A51) is connected with the outer ring of the inner column (A55) through the top plate (A54), and the top of the pressing handle (A52) is in surface contact with the left side of the spring (A53).
5. The security power supply device according to claim 3, wherein: stable support post (A4) includes ejector pin (A41), backup pad (A42), arc (A43), support spring (A44), ejector pin (A41) left side and backup pad (A42) bottom activity block, arc (A43) one end and backup pad (A42) one side fixed connection, support spring (A44) one end and backup pad (A42) one side welded connection.
6. The security power supply device according to claim 5, wherein: the supporting plate (A42) includes outer plywood (B1), rotates wheel (B2), rolling axle (B3), rope (B4), stretches out piece (B5), outer plywood (B1) bottom and rotation wheel (B2) outer loop welded connection, rolling axle (B3) inner ring fixed mounting is inside rotating wheel (B2), rolling axle (B3) outer loop passes through rope (B4) and stretches out piece (B5) bottom and be connected, stretch out piece (B5) one side and outer plywood (B1) inside transitional coupling.
Priority Applications (1)
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CN202011026900.5A CN112153850A (en) | 2020-09-25 | 2020-09-25 | Security protection power supply unit |
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CN202011026900.5A CN112153850A (en) | 2020-09-25 | 2020-09-25 | Security protection power supply unit |
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CN112153850A true CN112153850A (en) | 2020-12-29 |
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CN202011026900.5A Pending CN112153850A (en) | 2020-09-25 | 2020-09-25 | Security protection power supply unit |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112954556A (en) * | 2021-01-28 | 2021-06-11 | 南京槅扇贸易有限公司 | Thin piezoelectric loudspeaker installation equipment |
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CN210378641U (en) * | 2019-07-19 | 2020-04-21 | 马鞍山市华能电力线路器材有限责任公司 | Lightning arrester device capable of preventing lightning stroke from breaking |
CN210628630U (en) * | 2019-10-29 | 2020-05-26 | 海南电网有限责任公司三亚供电局 | Quick earthing device of cable head |
CN211182083U (en) * | 2019-11-11 | 2020-08-04 | 达得利电力设备有限公司 | Pole-mounted circuit breaker for electric box for electric energy transmission |
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JPH10340760A (en) * | 1997-06-05 | 1998-12-22 | Hideji Okamoto | Current cut-off outlet in emergency |
JP2003295976A (en) * | 2002-04-03 | 2003-10-17 | Nec Access Technica Ltd | Hinge |
JP2013138006A (en) * | 2011-12-14 | 2013-07-11 | Abb Technology Ag | High-current switching arrangement |
US20130168976A1 (en) * | 2011-12-30 | 2013-07-04 | Li-Shih Liao | Electromagnetic doorlock with shock detection and power saving device |
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CN112954556A (en) * | 2021-01-28 | 2021-06-11 | 南京槅扇贸易有限公司 | Thin piezoelectric loudspeaker installation equipment |
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