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CN113738195A - Electromagnet of electromagnetic lock of subway shielded door - Google Patents

Electromagnet of electromagnetic lock of subway shielded door Download PDF

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Publication number
CN113738195A
CN113738195A CN202111230389.5A CN202111230389A CN113738195A CN 113738195 A CN113738195 A CN 113738195A CN 202111230389 A CN202111230389 A CN 202111230389A CN 113738195 A CN113738195 A CN 113738195A
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China
Prior art keywords
armature
ring
connecting arm
iron core
cylindrical hole
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CN202111230389.5A
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CN113738195B (en
Inventor
谭虓
徐丽群
谭添慧
曲秋莳
贾生
张君鹏
赵智强
卢泽泉
康亚进
梁安浩
张政飞
刘涛
林晓光
闻典
关振宇
侯志明
宫建光
马宁
彭李
何鹏
安东山
于永波
刘鹏
魏耀南
蔡友贵
刘扬
王建伟
郑耀军
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Shanghai Chaocheng Electron Science And Technology Co ltd
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Individual
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Publication of CN113738195A publication Critical patent/CN113738195A/en
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
    • E05B47/0002—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets
    • E05B47/0003—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets having a movable core
    • E05B47/0004—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets having a movable core said core being linearly movable
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
    • E05B47/0002—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets
    • E05B2047/0007—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets with two or more electromagnets

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

本发明属于地铁屏蔽门领域，尤其涉及一种地铁屏蔽门电磁锁的电磁铁，对于一般地铁屏蔽门电磁锁的电磁铁，有时会发生卡顿，本发明的技术方案是：设置了第一扁圆柱台阶13，使得第一衔铁11在铁芯中不卡顿；设置了第二扁圆柱台阶23，使得第二衔铁21在铁芯中不卡顿；设置了第三扁圆柱台阶33，使得第三衔铁31在铁芯中不卡顿；设置了球头14a，可以使球头连接臂14在第一竖直圆柱孔12内转动；设置了第二圆环26a，可以使双圆环连接臂26在第二竖直圆柱孔22内转动；设置了第四圆环36a，可以使钢丝绳连接臂36在第三竖直圆柱孔32内转动；这样就使得第一衔铁11、第二衔铁21和第三衔铁31在铁芯内运动时不卡顿。

Figure 202111230389

The invention belongs to the field of subway screen doors, and in particular relates to an electromagnet for an electromagnetic lock for a subway screen door. For the electromagnet of a general electromagnetic lock for a subway screen door, sometimes jamming occurs. The technical scheme of the present invention is: The cylindrical step 13 makes the first armature 11 not get stuck in the iron core; the second flat cylindrical step 23 is provided so that the second armature 21 does not get stuck in the iron core; the third flat cylindrical step 33 is provided so that the first The three armatures 31 are not stuck in the iron core; the ball head 14a is provided, which can make the ball head connecting arm 14 rotate in the first vertical cylindrical hole 12; the second ring 26a is provided, which can make the double ring connecting arm 26 rotates in the second vertical cylindrical hole 22; a fourth ring 36a is provided, which can make the wire rope connecting arm 36 rotate in the third vertical cylindrical hole 32; in this way, the first armature 11, the second armature 21 and the The third armature 31 is not stuck when moving in the iron core.

Figure 202111230389

Description

Electromagnet of electromagnetic lock of subway shielded door
Technical Field
The invention belongs to the field of subway shielded doors, and particularly relates to an electromagnet of an electromagnetic lock of a subway shielded door.
Background
For an electromagnet of an electromagnetic lock of a common subway shielded door, sometimes when an armature moves upwards in an iron core, the upper part of the armature is clamped in the iron core; sometimes jamming occurs when the armature moves in the core when the center of gravity of the mechanism being lifted by the armature is not on the vertical axis of the armature.
Disclosure of Invention
In order to solve the problems, the invention provides an electromagnet of an electromagnetic lock of a subway shielding door, which can prevent the armature from being blocked when moving in an iron core.
The technical scheme for realizing the aim of the invention is as follows: an electromagnet of an electromagnetic lock of a subway shielding door comprises an iron core, a coil wound outside the iron core and a first armature 11 inserted in the iron core, wherein the first armature 11 is internally provided with a first vertical cylindrical hole 12 along the axis direction, the first armature 11 extends outwards along the diameter direction at the bottom and forms a first flat cylindrical step 13 with a larger diameter, a ball head connecting arm 14 is installed in the first vertical cylindrical hole 12, the upper end of the ball head connecting arm 14 is a ball head 14a, the ball head 14a can rotate in the first vertical cylindrical hole 12, the middle section of the ball head connecting arm 14 is a first cylindrical rod 14b, the lower end of the ball head connecting arm 14 is a first circular ring 14c, a lantern ring 15 is installed in the first vertical cylindrical hole 12, the first armature 11 is provided with a first horizontal cylindrical hole 16 on the side surface of the cylinder, the side surface of the lantern ring is provided with a first horizontal threaded hole 17, the first horizontal cylindrical hole 16 and the first horizontal threaded hole 17 are coaxial, and the first armature 11 and the lantern ring 15 are connected together through a first screw 18.
An electromagnet of an electromagnetic lock of a subway shielding door comprises an iron core and a coil wound outside the iron core, and further comprises a second armature 21 inserted in the iron core, wherein a second vertical cylindrical hole 22 is formed in the second armature 21 along the axial direction, the second armature 21 extends outwards along the diameter direction at the bottom and forms a second flat cylindrical step 23 with a larger diameter, a second horizontal cylindrical hole 24 and a second horizontal threaded hole 25 are respectively formed in the cylindrical side surface of the second armature 21, the second horizontal cylindrical hole 24 and the second horizontal threaded hole 25 are coaxial, a double-circular-ring connecting arm 26 is installed in the second vertical cylindrical hole 22, the upper part of the double-circular-ring connecting arm 26 is a second circular-ring cylindrical arm 26a, the middle part of the double-circular-ring connecting arm 26 is a second horizontal threaded hole 26b, the lower part of the double-circular-ring connecting arm 26c is a third circular-ring cylindrical arm 26c, and the second circular-ring connecting arm 26a and the third circular-ring connecting arm 26c form an angle of 90 degrees, the second armature 21 and the double-ring connecting arm 26 are connected by a second screw 27, and the second ring 26a can rotate on the second screw 27.
An electromagnet of an electromagnetic lock of a subway shield door comprises an iron core, a coil wound outside the iron core and a third armature 31 inserted in the iron core, wherein the third armature 31 is internally provided with a third vertical cylindrical hole 32 along the axial direction, the bottom of the third armature 31 extends outwards along the diameter direction to form a third flat cylindrical step 33 with a larger diameter, the side surface of a cylinder of the third armature 31 is respectively provided with a third horizontal cylindrical hole 34 and a third horizontal threaded hole 35, the third horizontal cylindrical hole 34 and the third horizontal threaded hole 35 are coaxial, a steel wire rope 36 is installed in the third vertical cylindrical hole 32, the upper part of the steel wire rope connecting arm 36 is a fourth circular ring 36a, the middle section of the steel wire rope connecting arm 36 is a steel wire rope 36b, the lower part of the steel wire rope connecting arm 36 is a fifth circular ring 36c, the third armature 31 is connected with the steel wire rope connecting arm 36 through a third screw 37, said fourth ring 36a can rotate on the third screw 37.
The number of the first horizontal cylindrical holes 16 is at least 1.
The number of the first horizontal threaded holes 17 is at least 1.
The number of the first screws 18 is at least 1.
The working principle of the invention is as follows: the first flat cylindrical step 13 is arranged at a proper position of the first armature 11, so that the first armature 11 cannot be clamped in the iron core when moving upwards in the iron core; the second flat cylindrical step 23 is arranged at a proper position of the second armature 21, so that the second armature 21 cannot be clamped in the iron core when moving upwards in the iron core; the third flat cylindrical step 33 is arranged at a proper position of the third armature 31, so that the third armature 31 cannot be clamped in the iron core when moving upwards in the iron core; due to the arrangement of the ball head 14a, the ball head connecting arm 14 can rotate in the first vertical cylindrical hole 12; due to the arrangement of the second circular ring 26a, the double-circular-ring connecting arm 26 can rotate in the second vertical cylindrical hole 22; due to the arrangement of the fourth ring 36a, the steel wire rope connecting arm 36 can rotate in the third vertical cylindrical hole 32; this prevents the first armature 11, the second armature 21 and the third armature 31 from jamming when moving upward within the core.
The invention has the beneficial effects that: due to the adoption of the electromagnet of the electromagnetic lock of the subway shield door, the armature can freely move in the iron core without jamming, potential safety hazards are eliminated, and the stability of a product is improved.
Drawings
FIG. 1 is a schematic view of a first armature and a connection structure of an electromagnet of an electromagnetic lock of a subway shielding door, which is disclosed by the invention;
FIG. 2 is a schematic view of a second armature and a connection structure of an electromagnet of the electromagnetic lock of the subway shield door, which is disclosed by the invention;
FIG. 3 is a schematic view of a third armature and a connection structure of an electromagnet of the electromagnetic lock of the subway shield door of the invention;
in the figure: 11-a first armature, 12-a first vertical cylindrical bore, 13-a first flat cylindrical step, 14-a ball-head connecting arm, 14 a-a ball head, 14 b-a first cylindrical rod, 14 c-a first circular ring, 15-a collar, 16-a first horizontal cylindrical bore, 17-a first horizontal threaded bore, 18-a first screw, 21-a second armature, 22-a second vertical cylindrical bore, 23-a second flat cylindrical step, 24-a second horizontal cylindrical bore, 25-a second horizontal threaded bore, 26-a double circular ring connecting arm, 26 a-a second circular ring, 26 b-a second cylindrical rod, 26 c-a third circular ring, 27-a second screw, 31-a third armature, 32-a third vertical cylindrical bore, 33-a third flat cylindrical step, 34-a third horizontal cylindrical hole, 35-a third horizontal threaded hole, 36-a steel wire rope connecting arm, 36 a-a fourth ring, 36 b-a steel wire rope, 36 c-a fifth ring and 37-a third screw.
Detailed Description
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout manner of the drawings in the specification, such as: the positional relationship of up, down, left, right, etc. is determined according to the layout direction of the drawings in the specification, and the drawings and the drawing direction are for illustrative purposes only and are not to be construed as limiting the patent of the present invention.
Example 1: referring to fig. 1, an electromagnet of an electromagnetic lock of a subway shield door according to an embodiment of the present invention includes an iron core and a coil wound outside the iron core, and further includes a first armature 11 inserted into the iron core, where the first armature 11 is internally provided with a first vertical cylindrical hole 12 along an axial direction, the first armature 11 extends outward in a bottom direction along a diameter direction and forms a first flat cylindrical step 13 with a larger diameter, a ball connecting arm 14 is installed in the first vertical cylindrical hole 12, an upper end of the ball connecting arm 14 is a ball 14a, the ball 14a can rotate in the first vertical cylindrical hole 12, a middle section of the ball connecting arm 14 is a first cylindrical rod 14b, a lower end of the ball connecting arm 14 is a first circular ring 14c, a collar 15 is installed in the first vertical cylindrical hole 12, the first armature 11 is provided with a first horizontal cylindrical hole 16 on a cylindrical side surface, the side surface of the lantern ring is provided with a first horizontal threaded hole 17, the first horizontal cylindrical hole 16 and the first horizontal threaded hole 17 are coaxial, and the first armature 11 and the lantern ring 15 are connected together through a first screw 18.
Example 2: referring to fig. 2, the electromagnet of the electromagnetic lock of the subway shield door comprises an iron core and a coil wound outside the iron core, and further comprises a second armature 21 inserted in the iron core, wherein the second armature 21 is internally provided with a second vertical cylindrical hole 22 along the axial direction, the second armature 21 extends outwards along the diameter direction at the bottom and forms a second flat cylindrical step 23 with a larger diameter, the second armature 21 is respectively provided with a second horizontal cylindrical hole 24 and a second horizontal threaded hole 25 on the cylindrical side surface, the second horizontal cylindrical hole 24 and the second horizontal threaded hole 25 are coaxial, a double-circular-ring connecting arm 26 is installed in the second vertical cylindrical hole 22, the upper part of the double-circular-ring connecting arm 26 is a second circular ring 26a, the middle part of the double-circular-ring connecting arm 26 is a second cylindrical rod 26b, the lower part of the double-circular-ring connecting arm 26 is a third circular ring connecting arm 26c, the second ring 26a and the third ring 26c are at 90 degrees, the second armature 21 and the double-ring connecting arm 26 are connected by a second screw 27, and the second ring 26a can rotate on the second screw 27.
Example 3: referring to fig. 3, the electromagnet of the electromagnetic lock of the subway shield door comprises an iron core and a coil wound outside the iron core, and further comprises a third armature 31 inserted in the iron core, wherein the third armature 31 is internally provided with a third vertical cylindrical hole 32 along the axial direction, the third armature 31 extends outwards along the diameter direction at the bottom and forms a third flat cylindrical step 33 with a larger diameter, the third armature 31 is provided with a third horizontal cylindrical hole 34 and a third horizontal threaded hole 35 on the cylindrical side surface respectively, the third horizontal cylindrical hole 34 and the third horizontal threaded hole 35 are coaxial, a steel wire rope connecting arm 36 is installed in the third vertical cylindrical hole 32, the upper part of the steel wire rope connecting arm 36 is a fourth circular ring 36a, the middle part of the steel wire rope connecting arm 36 is a steel wire rope 36b, and the lower part of the steel wire rope connecting arm 36 is a fifth circular ring 36c, the third armature 31 and the cable connecting arm 36 are connected by a third screw 37, and the fourth ring 36a can rotate on the third screw 37.
The number of the first horizontal cylindrical holes 16 is at least 1.
The number of the first horizontal threaded holes 17 is at least 1.
The number of the first screws 18 is at least 1.
In actual manufacturing, the armature 11 and the first flat cylindrical step 13 can be manufactured separately, and then the armature 11 and the first flat cylindrical step 13 are welded together; alternatively, the armature 11 and the first flat cylindrical step 13 may be separately formed, and the first flat cylindrical step 13 and the collar 15 may be integrally formed.
It is also possible to manufacture the armature 21 and the second flat cylindrical step 23 separately and then weld the armature 21 and the second flat cylindrical step 23 together.
It is also possible to manufacture the armature 31 and the third flat cylindrical step 33 separately and then weld the armature 31 and the third flat cylindrical step 33 together.
The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by the design concept of the present invention fall within the scope of the present invention.

Claims (6)

1.一种地铁屏蔽门电磁锁的电磁铁，包括铁芯和缠绕在铁芯外部的线圈，其特征是：还包括插在铁芯内的第一衔铁（11），所述的第一衔铁（11）在内部沿轴线方向开有第一竖直圆柱孔（12），所述的第一衔铁（11）在底部沿直径方向向外延展并形成直径较大的第一扁圆柱台阶（13），所述的第一竖直圆柱孔（12）内安装有球头连接臂（14），所述的球头连接臂（14）的上端为球头（14a），所述的球头（14a）可以在所述的第一竖直圆柱孔（12）内转动，所述的球头连接臂（14）的中间段为第一圆柱杆（14b），所述的球头连接臂（14）的下端为第一圆环（14c），所述的第一竖直圆柱孔（12）内安装有套环（15），所述的第一衔铁（11）在圆柱侧面开有第一水平圆柱孔（16），所述的套环在侧面开有第一水平螺纹孔（17），所述的第一水平圆柱孔（16）和所述的第一水平螺纹孔（17）同轴线，所述的第一衔铁（11）和套环（15）通过第一螺钉（18）连接在一起。1. An electromagnet for an electromagnetic lock for a subway screen door, comprising an iron core and a coil wound around the outside of the iron core, characterized in that it also comprises a first armature (11) inserted in the iron core, the first armature (11) A first vertical cylindrical hole (12) is opened inside along the axial direction, and the first armature (11) extends outward in the diameter direction at the bottom and forms a first flat cylindrical step (13) with a larger diameter ), a ball joint arm (14) is installed in the first vertical cylindrical hole (12), the upper end of the ball joint arm (14) is a ball joint (14a), and the ball joint ( 14a) can be rotated in the first vertical cylindrical hole (12), the middle section of the ball joint arm (14) is a first cylindrical rod (14b), and the ball joint arm (14) ) is a first circular ring (14c) at its lower end, a collar (15) is installed in the first vertical cylindrical hole (12), and a first horizontal opening on the cylindrical side of the first armature (11) is provided. A cylindrical hole (16), the collar is provided with a first horizontal threaded hole (17) on the side, and the first horizontal cylindrical hole (16) and the first horizontal threaded hole (17) are coaxial , the first armature (11) and the collar (15) are connected together by a first screw (18). 2.根据权利要求1的一种地铁屏蔽门电磁锁的电磁铁，其特征是：一种地铁屏蔽门电磁锁的电磁铁，包括铁芯和缠绕在铁芯外部的线圈，还包括插在铁芯内的第二衔铁（21），所述的第二衔铁（21）在内部沿轴线方向开有第二竖直圆柱孔（22），所述的第二衔铁（21）在底部沿直径方向向外延展并形成直径较大的第二扁圆柱台阶（23），所述的第二衔铁（21）在圆柱侧面分别开有第二水平圆柱孔（24）和第二水平螺纹孔（25），所述的第二水平圆柱孔（24）和第二水平螺纹孔（25）同轴线，所述的第二竖直圆柱孔（22）内安装有双圆环连接臂（26），所述的双圆环连接臂（26）上部为第二圆环（26a），所述的双圆环连接臂（26）中间段为第二圆柱杆（26b），所述的双圆环连接臂（26）下部为第三圆环（26c），所述的第二圆环（26a）和第三圆环（26c）成90度，所述的第二衔铁（21）和所述的双圆环连接臂（26）通过第二螺钉（27）连接，所述的第二圆环（26a）可以在第二螺钉（27）上转动。2. the electromagnet of a kind of subway screen door electromagnetic lock according to claim 1, it is characterized in that: a kind of electromagnet of subway screen door electromagnetic lock, comprises iron core and the coil that is wound on the outside of iron core, also comprises inserting iron core The second armature (21) in the core, the second armature (21) has a second vertical cylindrical hole (22) inside along the axis direction, and the second armature (21) is diametrically at the bottom A second flat cylindrical step (23) with a larger diameter is formed by extending outward, and the second armature (21) is respectively provided with a second horizontal cylindrical hole (24) and a second horizontal threaded hole (25) on the side of the cylinder. , the second horizontal cylindrical hole (24) and the second horizontal threaded hole (25) are coaxial, and the second vertical cylindrical hole (22) is installed with a double ring connecting arm (26), so The upper part of the double-ring connecting arm (26) is a second ring (26a), the middle section of the double-ring connecting arm (26) is a second cylindrical rod (26b), and the double-ring connecting arm (26b) (26) The lower part is a third ring (26c), the second ring (26a) and the third ring (26c) are at 90 degrees, the second armature (21) and the double ring The ring connecting arm (26) is connected by a second screw (27), and the second circular ring (26a) can be rotated on the second screw (27). 3.根据权利要求1的一种地铁屏蔽门电磁锁的电磁铁，其特征是：一种地铁屏蔽门电磁锁的电磁铁，包括铁芯和缠绕在铁芯外部的线圈，还包括插在铁芯内的第三衔铁（31），所述的第三衔铁（31）在内部沿轴线方向开有第三竖直圆柱孔（32），所述的第三衔铁（31）在底部沿直径方向向外延展并形成直径较大的第三扁圆柱台阶（33），所述的第三衔铁（31）在圆柱侧面分别开有第三水平圆柱孔（34）和第三水平螺纹孔（35），所述的第三水平圆柱孔（34）和第三水平螺纹孔（35）同轴线，所述的第三竖直圆柱孔（32）内安装有钢丝绳连接臂（36），所述的钢丝绳连接臂（36）上部为第四圆环（36a），所述的钢丝绳连接臂（36）中间段为钢丝绳（36b），所述的钢丝绳连接臂（36）下部为第五圆环（36c），所述的第三衔铁（31）和钢丝绳连接臂（36）通过第三螺钉（37）连接，所述的第四圆环（36a）可以在第三螺钉（37）上转动。3. the electromagnet of a kind of subway screen door electromagnetic lock according to claim 1, it is characterized in that: a kind of electromagnet of subway screen door electromagnetic lock, comprises iron core and the coil that is wound on the outside of iron core, also comprises inserting iron core The third armature (31) in the core, the third armature (31) is provided with a third vertical cylindrical hole (32) along the axis, and the third armature (31) is diametrically at the bottom A third flat cylindrical step (33) with a larger diameter is formed, and the third armature (31) is respectively provided with a third horizontal cylindrical hole (34) and a third horizontal threaded hole (35) on the side of the cylinder. , the third horizontal cylindrical hole (34) and the third horizontal threaded hole (35) are coaxial, the third vertical cylindrical hole (32) is installed with a wire rope connecting arm (36), the The upper part of the wire rope connecting arm (36) is a fourth ring (36a), the middle section of the wire rope connecting arm (36) is a wire rope (36b), and the lower part of the wire rope connecting arm (36) is a fifth ring (36c). ), the third armature (31) and the wire rope connecting arm (36) are connected by a third screw (37), and the fourth ring (36a) can be rotated on the third screw (37). 4.根据权利要求1的一种地铁屏蔽门电磁锁的电磁铁，其特征是：所述的第一水平圆柱孔（16）的数量至少为1个。4 . The electromagnet of an electromagnetic lock for a subway screen door according to claim 1 , wherein the number of the first horizontal cylindrical holes ( 16 ) is at least one. 5 . 5.根据权利要求1的一种地铁屏蔽门电磁锁的电磁铁，其特征是：所述的第一水平螺纹孔（17）的数量至少为1个。5 . The electromagnet of an electromagnetic lock for a subway screen door according to claim 1 , wherein the number of the first horizontal threaded holes ( 17 ) is at least one. 6 . 6.根据权利要求1的一种地铁屏蔽门电磁锁的电磁铁，其特征是：所述的第一螺钉（18）的数量至少为1个。6 . The electromagnet of an electromagnetic lock for a subway screen door according to claim 1 , wherein the number of the first screws ( 18 ) is at least one. 7 .
CN202111230389.5A 2021-10-22 2021-10-22 An electromagnet for the electromagnetic lock of subway screen door Active CN113738195B (en)

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US3265941A (en) * 1963-09-24 1966-08-09 Hi G Inc Electromagnetic operator
US6318137B1 (en) * 1998-04-08 2001-11-20 David Chaum Electronic lock that can learn to recognize any ordinary key
CN2643469Y (en) * 2003-09-23 2004-09-22 袁加瑞 Energy-saving intelligent contactor
CN209133296U (en) * 2019-01-22 2019-07-19 四川新川航空仪器有限责任公司 A kind of new electromagnet with strong attraction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265941A (en) * 1963-09-24 1966-08-09 Hi G Inc Electromagnetic operator
US6318137B1 (en) * 1998-04-08 2001-11-20 David Chaum Electronic lock that can learn to recognize any ordinary key
US20030205070A1 (en) * 1998-04-08 2003-11-06 David Chaum Electronic lock that can learn to recognize any ordinary key
CN2643469Y (en) * 2003-09-23 2004-09-22 袁加瑞 Energy-saving intelligent contactor
CN209133296U (en) * 2019-01-22 2019-07-19 四川新川航空仪器有限责任公司 A kind of new electromagnet with strong attraction

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