CN211900111U - Safety door electromagnetic lock - Google Patents
Safety door electromagnetic lock Download PDFInfo
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- CN211900111U CN211900111U CN202020171330.8U CN202020171330U CN211900111U CN 211900111 U CN211900111 U CN 211900111U CN 202020171330 U CN202020171330 U CN 202020171330U CN 211900111 U CN211900111 U CN 211900111U
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Abstract
The utility model discloses an emergency exit electromagnetic lock, include: the upper surface of the main connecting piece is provided with a first shaft; an electromagnet connected to the upper surface of the main connecting piece; the trigger piece is connected to the upper surface of the main connecting piece through a first stepped shaft, one end of the trigger piece is connected with the electromagnet, and the trigger piece rotates by taking the first stepped shaft as a rotating center under the action of the electromagnet; the torsion spring is sleeved on the first stepped shaft and limited between the first shaft and the trigger piece; the first travel switch is connected to the upper surface of the main connecting piece and is contacted with or separated from the other end of the trigger piece; the poking piece is connected to the main connecting piece and can penetrate through the main connecting piece, one part of the poking piece is arranged between the electromagnet and the upper surface of the main connecting piece and matched with the trigger piece, and the other part of the poking piece penetrates through the main connecting piece from the lower surface of the main connecting piece and is matched with the sliding door lock pin at the lower surface, so that the poking piece is convenient to be linked with the sliding door lock pin; the technical problems of large volume, difficult installation, high failure rate and unstable performance are solved.
Description
Technical Field
The utility model relates to an emergency exit technical field, specific emergency exit electromagnetic lock that says so.
Background
Along with the development of city subway, the demand of subway emergency exit is more and more, and in whole emergency exit system module, the sliding door is the door body that frequency of use is the highest, and in the sliding door opening system, the electromagnetic lock is the most critical core component, and whether the function of electromagnetic lock is reliable, whether the relation door body can normally be opened, and present electromagnetic lock is bulky, and difficult installation, the fault rate is high, and the performance is unstable.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned weak point that exists among the correlation technique, the utility model aims at providing an emergency exit electromagnetic lock to solve bulky among the correlation technique, be difficult for the installation, the fault rate is high, the unstable technical problem of performance.
Realize the utility model discloses the technical scheme of purpose is: an electromagnetic lock for a security door comprising:
the upper surface of the main connecting piece is provided with a first shaft;
the electromagnet is connected to the upper surface of the main connecting piece;
the trigger piece is connected to the upper surface of the main connecting piece through a first stepped shaft, one end of the trigger piece is connected with the electromagnet, and the trigger piece rotates by an angle with the first stepped shaft as a rotating center under the action of the electromagnet;
the torsion spring is sleeved on the first step shaft and limited between the first shaft and the trigger piece;
the first travel switch is connected to the upper surface of the main connecting piece and can be contacted with or separated from the other end of the trigger piece;
and the poking piece is connected to the main connecting piece and can penetrate through the main connecting piece, one part of the poking piece is arranged between the electromagnet and the upper surface of the main connecting piece and is matched with the trigger piece, and the other part of the poking piece penetrates through the main connecting piece from the lower surface of the main connecting piece and is matched with the sliding door lock pin at the lower surface, so that the sliding door lock pin can be linked with the poking piece conveniently.
Further: the trigger member includes: the middle part of the first step shaft is connected with the first step shaft, two ends of the first step shaft extend outwards from the middle part respectively to form an included angle, one end of the first step shaft extends to the first travel switch, the other end of the first step shaft extends to the shifting piece, and the first step shaft is provided with a convex block which can be clamped with the shifting piece;
and a second member vertically attached to an upper surface of the first member for connection with the electromagnet.
Further: the first step shaft includes: the stepped shaft section is provided with a circular groove, one end of the stepped shaft section is connected to the main connecting piece, and the other end of the stepped shaft section penetrates through the trigger piece and is used for connecting the torsion spring;
and the first plate is connected to the top of the stepped shaft section, and the outer diameter of the first plate is larger than that of the maximum position of the stepped shaft section.
Further: the toggle piece comprises: the outer lock disc is connected to the main connecting piece through a bearing assembly and is matched with the sliding door lock pin through a first notch;
and the outer edge of the inner lock disc is provided with a second notch which is connected to the top of the outer lock disc, arranged between the electromagnet and the upper surface of the main connecting piece and can be clamped with the lug through the second notch.
Further: further comprising: the manual unlocking piece is connected to the main connecting piece;
the manual unlocking member includes: a second travel switch connected to an upper surface of the main link;
the second stepped shaft penetrates through the main connecting piece, is in clearance fit with the main connecting piece, can move on the main connecting piece, has a conical surface at one end, is contacted with the trigger piece through the conical surface, and protrudes out of the lower surface of the main connecting piece at the other end;
the spring is sleeved on the second step shaft, and one end of the spring is attached to the lower surface of the main connecting piece;
and a handle connected to the other end of the second stepped shaft and pressing the other end of the spring.
By adopting the technical scheme, the utility model discloses following beneficial effect has: compared with the prior art, the safety door electromagnetic lock is provided with the main connecting piece, so that the safety door electromagnetic lock can be conveniently installed on a required position; the main connecting piece is connected with an electromagnet, a trigger piece, a first stepped shaft, a torsion spring, a first travel switch and a toggle piece, when a door body needs to be opened, the electromagnet is electrified, the trigger piece is linked, the first stepped shaft is taken as a rotating center to rotate for a certain angle, the trigger piece is separated from the toggle piece, the first travel switch is in a release state and transmits a door opening signal to a door controller DCU, so that a sliding door lock pin can push the toggle piece away, and the door body is opened; therefore, the technical problems of large volume, difficult installation, high failure rate and unstable performance are solved, the technical effects of relatively small volume, convenient installation, good reliability and relatively low failure rate are achieved, and the method is favorable for wide popularization.
Drawings
Fig. 1 is one of schematic three-dimensional structures of an embodiment of the present invention;
fig. 2 is a second schematic three-dimensional structure diagram of the embodiment of the present invention;
fig. 3 is a schematic three-dimensional structure diagram of the triggering member according to the embodiment of the present invention;
fig. 4 is a schematic three-dimensional structure diagram of the main connecting member and the first shaft according to the embodiment of the present invention;
fig. 5 is a schematic three-dimensional structure diagram of a first stepped shaft according to an embodiment of the present invention;
fig. 6 is a schematic three-dimensional structure diagram of the toggle member according to the embodiment of the present invention;
fig. 7 is a schematic three-dimensional structure diagram of an outer lock disk according to an embodiment of the present invention;
fig. 8 is a schematic three-dimensional structure diagram of an inner lock disk according to an embodiment of the present invention;
fig. 9 is a cross-sectional view of a toggle member according to an embodiment of the present invention;
fig. 10 is an installation schematic of a manual unlocking member in an embodiment of the invention;
fig. 11 is a partial cross-sectional view of a manual unlocking member in an embodiment of the present invention;
in the figure: 10. the sliding door lock comprises a main connecting piece, 11, a first shaft, 20, an electromagnet, 30, a trigger piece, 31, a first piece, 311, a bump, 32, a second piece, 40, a first step shaft, 41, a step shaft section, 411, an annular groove, 42, a first plate, 50, a torsion spring, 60, a first travel switch, 70, a toggle piece, 71, an outer lock disc, 711, a first gap, 72, a bearing assembly, 73, an inner lock disc, 731, a second gap, 80, a manual unlocking piece, 81, a second travel switch, 82, a second step shaft, 821, a conical surface, 83, a spring, 84, a handle and 1000.
Detailed Description
In order to make the content of the present invention more clearly understood, the present invention will be further described in detail with reference to the following embodiments in conjunction with the accompanying drawings;
the utility model relates to an emergency exit electromagnetic lock has solved bulky among the correlation technique, is difficult for the installation, and the fault rate is high, the unstable technical problem of performance, it is relatively less to have reached the volume, simple to operate, and the good reliability, the positive effect that the fault rate is relatively lower, general thinking as follows:
the first embodiment is as follows:
as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9; an electromagnetic lock for a security door comprising:
a main link 10 having a first shaft 11 on an upper surface;
an electromagnet 20 attached to an upper surface of the main link 10;
a trigger 30 connected to the upper surface of the main link 10 through a first stepped shaft 40, and having one end connected to the electromagnet 20, and rotating at a rotation angle around the first stepped shaft 40 under the action of the electromagnet 20;
a torsion spring 50 sleeved on the first step shaft 40 and limited between the first shaft 11 and the trigger 30;
a first stroke switch 60 connected to an upper surface of the main link 10 and capable of contacting or separating the other end of the trigger 30;
the toggle piece 70 is connected to the main connecting piece 10, can penetrate through the main connecting piece 10, is partially arranged between the electromagnet 20 and the upper surface of the main connecting piece 10 and is matched with the trigger piece 30, and is partially penetrated through the main connecting piece 10 from the lower surface of the main connecting piece 10 and is matched with the sliding door lock pin 1000 at the lower surface, so that the sliding door lock pin 1000 can be linked with the toggle piece 70;
particularly, when the safety door electromagnetic lock is implemented, the main connecting piece 10 is arranged, so that the safety door electromagnetic lock can be conveniently installed on a required position; the main connecting piece 10 is connected with an electromagnet 20, a trigger piece 30, a first step shaft 40, a torsion spring 50, a first travel switch 60 and a toggle piece 70, when a door body needs to be opened, the electromagnet 20 is electrified to link the trigger piece 30, the trigger piece 30 is separated from the toggle piece 70 by taking the first step shaft 40 as a rotation center, the first travel switch 60 is in a release state and transmits a door opening signal to a door controller DCU, a driver in the door controller DCU drives a motor to work, the motor drives a sliding door to move, the sliding door drives a sliding door lock pin 1000 to push the toggle piece 70 open, and the door body is opened; the technical problems of large volume, difficult installation, high failure rate and unstable performance are solved, and the technical effects of relatively small volume, convenient installation, good reliability and relatively low failure rate are achieved;
the following is a detailed description of the respective constituent elements and the connection relationship:
specifically, as shown in fig. 1, 2 and 4, the main connecting member 10 is square in shape, made of metal, and used for mounting the electromagnetic lock of the safety door to a required position; the first shaft 11 is a section of round shaft, is welded on the main connecting piece 10 and can limit the torsion spring 50;
specifically, as shown in fig. 1 and 2, the electromagnet 20 is a common structure in the prior art, and is connected to the main connecting member 10 by a bent section bar penetrating screw, and one end of the electromagnet is connected to the triggering member 30 by a screw, and the triggering member 30 penetrates the screw and is in threaded connection with a threaded blind hole reserved at the end of the telescopic shaft of the electromagnet 20;
the torsion spring 50 is a common structure in the prior art, the middle part of the torsion spring 50 is sleeved on the first step shaft 40, two ends of the torsion spring 50 are limited between the first shaft 11 and the trigger piece 30, when the trigger piece 30 is pushed to rotate by the electromagnet 20, the torsion spring 50 can form torsion force, so that when the toggle piece 70 is pushed away by the sliding door lock pin 1000, the convex block 311 on the trigger piece 30 is always attached to the outer edge of the inner lock disc 73, the convex block 311 can smoothly enter the second notch 731 when the door body is closed, and the door body can be opened or closed more smoothly;
the first travel switch 60 is a common microswitch in the prior art and is connected to the main connecting piece 10 through a section bar penetrating screw;
those skilled in the art, having the benefit of the present disclosure, will be able to directly and unambiguously know how to configure the electromagnet 20, the torsion spring 50, and the first travel switch 60 without the need for creative labor and undue experimentation;
specifically, as shown in fig. 1, 2 and 3, the trigger 30 includes: a first member 31 having a middle portion connected to the first step shaft 40, two ends extending outward from the middle portion to form an included angle, one end extending to the first travel switch 60, the other end extending to the toggle member 70, and a protrusion 311 capable of engaging with the toggle member 70;
and a second member 32 vertically attached to an upper surface of the first member 31 for connection with the electromagnet 20;
in implementation, the first piece 31 is formed by punching a plate, and then is partially bent, the bent part is used for contacting with or separating from the first travel switch 60, and is provided with a first through hole which is in clearance fit with the first step shaft 40, so that the trigger 30 can be positioned on the first step shaft 40 and can rotate by taking the first step shaft 40 as a rotation center;
the second part 32 is formed by punching a plate, then welded with the first part 31, and a screw is penetrated through the second part 32 and is in threaded connection with a threaded blind hole reserved at the end part of the telescopic shaft of the electromagnet 20, so that the trigger part 30 is connected to the electromagnet 20;
the trigger 30 is arranged, under the action of the electromagnet 20, the trigger 30 is respectively contacted with or separated from the first travel switch 60 and the toggle piece 70, so that the opening or closing of the door body is realized;
specifically, as shown in fig. 1, 2, and 5, the first step shaft 40 includes: the stepped shaft section 41 is provided with a circular groove 411, one end of the stepped shaft section is connected to the main connecting piece 10, and the other end of the stepped shaft section penetrates through the trigger piece 30 and is used for connecting the torsion spring 50;
the first plate 42 is connected to the top of the stepped shaft section 41, and the outer diameter of the first plate 42 is larger than that of the maximum part of the stepped shaft section 41;
when the connection is implemented, the stepped shaft section 41 is machined through a section of round steel, and one end of the stepped shaft section is tightly matched with the second through hole reserved on the main connecting piece 10, so that the stepped shaft section 41 is reliably connected to the main connecting piece 10;
the first plate 42 is circular in shape and is connected to the top of the stepped shaft section 41 through a countersunk head screw or welded to the top of the stepped shaft section 41, so that a barrier can be formed and the torsion spring 50 can be prevented from falling off;
the annular groove 411 is arranged and used for connecting the first clamp spring and limiting the trigger 30, so that the trigger 30 can be prevented from moving on the stepped shaft section 41, and the reliability of the structure is improved;
specifically, as shown in fig. 1, 2, 6, 7, 8, and 9, the toggle member 70 includes: an outer lock disk 71 coupled to the main link 10 by a bearing assembly 72 and engaged with the sliding door lock pin 1000 by a first notch 711;
the inner lock disc 73 is provided with a second notch 731 on the outer edge, is connected to the top of the outer lock disc 71, is arranged between the electromagnet 20 and the upper surface of the main connecting piece 10, and can be clamped with the lug 311 through the second notch 731;
in practice, the outer lock collar 71 is machined from a forged blank, and includes: a shaft section penetrating through the first stepped through hole reserved in the main link 10 and connected to the bearing assembly 72; and a catch plate having a first notch 711, having an outline similar to an airplane shape, capable of being fitted with the sliding door lock pin 1000;
the bearing assembly 72 includes: two deep groove ball bearings and two second snap springs; a second clamp spring is connected in the first step through hole and arranged between the two deep groove ball bearings; the other second snap spring is connected to the shaft section, forming a stop for defining the position of the two deep groove ball bearings, so that the outer lock disc 71 can be reliably connected to the main connector 10 through the bearing assembly 72;
the inner lock disc 73 is circular in shape and is connected to the outer lock disc 71 through an inner hexagonal bolt;
the toggle piece 70 is arranged, and the second notch 731 on the inner lock disk 73 is clamped with the convex block 311, so that the door body can be reliably closed; when the second notch 731 is disengaged from the protrusion 311, the sliding door lock pin 1000 can be linked with the toggle piece 70 to rotate, so that the door body is opened;
example two:
as shown in fig. 10, 11; on the basis of the first embodiment, the method further comprises the following steps: a manual unlocking member 80 connected to the main link 10;
the manual unlocking member 80 includes: a second stroke switch 81 connected to an upper surface of the main link 10;
a second stepped shaft 82 inserted into the main link 10, having a clearance fit with the main link 10, and being movable on the main link 10, having a tapered surface 821 at one end thereof, and contacting the trigger 30 via the tapered surface 821, and having the other end thereof protruding outside the lower surface of the main link 10;
a spring 83, which is sleeved on the second step shaft 82, and one end of which is attached to the lower surface of the main connecting piece 10;
and a handle 84 connected to the other end of the second step shaft 82 and pressing the other end of the spring 83, so that the spring 83 is always in a micro-compression state;
in implementation, the second travel switch 81 is a common microswitch in the prior art, is connected to the main connecting piece 10 by a section bar penetrating screw, and can be triggered by the second step shaft 82; those skilled in the art, having the benefit of the present disclosure, will be able to directly and unambiguously know how to set the second travel switch 81 without the need for creative effort and undue experimentation;
the second stepped shaft 82 is machined from a section of round steel;
the spring 83 is a cylindrical spring in the prior art;
the handle 84 is machined from a section of round steel and is in threaded connection with an external thread section on the outer circle of the second stepped shaft 82, so that the installation and the disassembly are convenient;
the manual unlocking piece 80 is arranged, when the electromagnet 20 breaks down or is in an emergency, the manual unlocking device on the sliding door is operated, the manual unlocking device presses the handle 84, the spring 83 is continuously compressed, the second stepped shaft 82 pushes the trigger piece 30 to rotate, after the second notch 731 is separated from the convex block 311, the second stepped shaft 82 triggers the second travel switch 81 at the same time, a DCU manual unlocking signal is transmitted, so that the sliding door lock pin 1000 can push the toggle piece 70 away, and the door body is opened;
the working principle of the utility model is as follows:
unlocking working principle:
when the door body needs to be opened, the central control panel PSC outputs a door opening instruction, after the door controller DCU receives the door opening instruction, the electromagnet 20 is electrified, the trigger piece 30 is linked, the first step shaft 40 is taken as a rotation center for rotating by an angle, the trigger piece 30 is separated from the stirring piece 70, the first travel switch 60 is in a release state and transmits a door opening signal to the DCU, a driver in the door controller DCU sends an instruction to drive the motor to act, the motor drives the sliding door body to move, so that the sliding door lock pin 1000 can push the stirring piece 70 away, and the door body is opened;
the locking working principle is as follows:
when the door body needs to be closed, the central control panel PSC outputs a door closing instruction, after a driver in the door controller DCU receives the door closing instruction, the driver drives the motor to act, so that the door body starts to move, the sliding door lock pin 1000 is driven by the door body to push the toggle piece 70, so that the second notch 731 is clamped with the bump 311, the toggle piece 70 cannot continue to rotate, meanwhile, the trigger piece 30 is in contact with the first travel switch 60, the first travel switch 60 transmits a locking signal to the DCU, and the door body is closed;
the working principle of manual unlocking is as follows:
the door body is in a closed state, when the electromagnet 20 breaks down or is in an emergency, the manual unlocking device on the sliding door body needs to be manually opened, the manual unlocking device presses the handle 84, the spring 83 continues to be compressed, the second stepped shaft 82 pushes the trigger piece 30 to rotate, after the second notch 731 is separated from the bump 311, the first travel switch 60 is in a release state and transmits a door opening signal to the door controller DCU, the safety circuit is disconnected, meanwhile, the second stepped shaft 82 triggers the second travel switch 81 and transmits the manual unlocking signal to the door controller DCU, the door body starts to move by manually pushing the door, the sliding door drives the sliding door lock pin 1000 to move, the sliding door lock pin 1000 pushes the toggle piece 70 to open, the door body is opened, the second travel switch 81 transmits a signal to a driver in the door controller DCU, and the driver sends an instruction to drive the motor to close the door after 30 seconds.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like, which indicate orientations or positional relationships, are based on the positional relationships illustrated in the drawings, and are only for convenience of describing the present invention or simplifying the description, but do not indicate specific orientations that must be provided; the operation processes described in the embodiments are not absolute use steps, and may be adjusted accordingly when actually used.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the use of "first," "second," and the like in the description and in the claims does not denote any order, quantity, or importance, but rather the terms "a" and "an" and the like are used to distinguish one element from another, and likewise, do not denote any limitation of quantity, but rather denote the presence of at least one of the referenced item, as may be required by the context of the embodiment.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. An electromagnetic lock for a security door, comprising:
a main connecting member (10) having a first shaft (11) on an upper surface thereof;
an electromagnet (20) connected to the upper surface of the main connector (10);
the trigger piece (30) is connected to the upper surface of the main connecting piece (10) through a first stepped shaft (40), one end of the trigger piece is connected with the electromagnet (20), and the trigger piece rotates by taking the first stepped shaft (40) as a rotating center under the action of the electromagnet (20);
the torsion spring (50) is sleeved on the first stepped shaft (40) and limited between the first shaft (11) and the trigger piece (30);
a first travel switch (60) connected to an upper surface of the main link (10) and capable of contacting or separating with the other end of the trigger (30);
and the stirring piece (70) is connected to the main connecting piece (10), can penetrate through the main connecting piece (10), is partially arranged between the electromagnet (20) and the upper surface of the main connecting piece (10) and is matched with the trigger piece (30), and is partially penetrated through the main connecting piece (10) from the lower surface of the main connecting piece (10) and is matched with the sliding door lock pin (1000) at the lower surface, so that the sliding door lock pin (1000) can be linked with the stirring piece (70).
2. The electromagnetic lock of a security door according to claim 1, wherein: the trigger (30) comprises: the middle part of the first piece (31) is connected to the first stepped shaft (40), two ends of the first piece respectively extend outwards from the middle part to form an included angle, one end of the first piece extends to the first travel switch (60), the other end of the first piece extends to the shifting piece (70), and the first piece is provided with a convex block (311) which can be clamped with the shifting piece (70);
and a second member (32) vertically attached to an upper surface of the first member (31) for connection with the electromagnet (20).
3. The electromagnetic lock of a security door according to claim 1, wherein: the first step shaft (40) includes: the stepped shaft section (41) is provided with a circular groove (411), one end of the stepped shaft section is connected to the main connecting piece (10), and the other end of the stepped shaft section penetrates through the trigger piece (30) and is used for connecting the torsion spring (50);
and a first plate (42) connected to the top of the stepped shaft section (41), wherein the outer diameter of the first plate (42) is larger than the largest outer diameter of the stepped shaft section (41).
4. The electromagnetic lock of the safety door according to claim 2, wherein: the toggle member (70) includes: an outer lock disk (71) connected to the main link (10) by a bearing assembly (72) and engaged with the sliding door lock pin (1000) by a first notch (711);
and the inner lock disc (73) is provided with a second notch (731) on the outer edge, is connected to the top of the outer lock disc (71), is arranged between the electromagnet (20) and the upper surface of the main connecting piece (10), and can be clamped with the lug (311) through the second notch (731).
5. The electromagnetic lock of a security door according to claim 1, wherein: further comprising: a manual unlocking member (80) connected to the main connecting member (10);
the manual unlocking member (80) includes: a second travel switch (81) connected to an upper surface of the main link (10);
a second stepped shaft (82) which is inserted into the main link (10), is in clearance fit with the main link (10), can move on the main link (10), has a tapered surface (821) at one end, is in contact with the trigger (30) through the tapered surface (821), and protrudes out of the lower surface of the main link (10) at the other end;
the spring (83) is sleeved on the second stepped shaft (82), and one end of the spring is attached to the lower surface of the main connecting piece (10);
and a handle (84) connected to the other end of the second step shaft (82) and pressing the other end of the spring (83).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020171330.8U CN211900111U (en) | 2020-02-15 | 2020-02-15 | Safety door electromagnetic lock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020171330.8U CN211900111U (en) | 2020-02-15 | 2020-02-15 | Safety door electromagnetic lock |
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| Publication Number | Publication Date |
|---|---|
| CN211900111U true CN211900111U (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020171330.8U Active CN211900111U (en) | 2020-02-15 | 2020-02-15 | Safety door electromagnetic lock |
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| CN (1) | CN211900111U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111155844A (en) * | 2020-02-15 | 2020-05-15 | 今创集团股份有限公司 | Safety door electromagnetic lock |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111155844A (en) * | 2020-02-15 | 2020-05-15 | 今创集团股份有限公司 | Safety door electromagnetic lock |
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