Electromagnetic door lock

Abstract

An electromagnetic door lock is described comprising: a housing; an electromagnetic core made of ferromagnetic metal and mounted in the housing; at least one bobbin made of metal or alloy; one or more coils wound on the at least one bobbin and the at least one bobbin mounted in conjunction with the electromagnet core; a removable cover plate made of metal covering the one or more coils; the electromagnet core comprising an exposed face extending through an opening in the cover plate to engage with a keeper when the electromagnet is activated in use.

Description

Technical Field

[0001] This utility model relates to an electromagnetic door lock, and more particularly to an improved electromagnetic door lock that reduces its environmental impact. Background Technology

[0002] refer to Figure 1 An electromagnetic door lock, magnetic lock, or magnetic lock is a locking device consisting of an electromagnet 100 and an armature plate 120.

[0003] Electromagnetic door locks work by using electromagnetic force to lock the door when energized. An electromagnet 100 is typically fixed to a fixed part at the building entrance, and an armature 120 is fixed to the door, serving as part of a building access or security system to control passage through the door. When energized, the electromagnet 100 attracts the armature 120 with sufficient force to prevent the door from being opened.

[0004] An electromagnet utilizes the principle that an electric current passing through one or more coils generates a magnetic field. Typically, a wire is wound around a tube surrounding a ferromagnetic core 112 to form an electromagnet. This ferromagnetic core is usually formed by welding together multiple metal sheets that make up the core. An epoxy resin potting compound is then poured around the core and the winding tube to hold the winding tube in place and protect it from damage. After potting and curing, the epoxy resin potting compound 114 forms a flat surface around the core 112, and the exposed areas of the core 112 slightly protrude from the epoxy resin to allow for magnetic engagement with the armature 20 during use.

[0005] The use of epoxy resin potting compound 114 prevents the electromagnet 100 from being disassembled for repair or recycling later. Furthermore, the epoxy resin compound requires a significant amount of time to cure during production. The curing and welding processes also release harmful gases during production, necessitating safe management and ventilation of the production area to protect the health of workers. Even with ventilation, these harmful gases will still enter the atmosphere, potentially impacting the local environment.

[0006] Furthermore, if machining is performed after the epoxy resin has cured, this will result in the generation of epoxy resin dust and debris, which are toxic substances and therefore must be specially treated.

[0007] Therefore, electromagnetic door locks still need improvement. Utility Model Content

[0008] In a first aspect, the present invention provides an electromagnetic door lock, comprising: a housing; an electromagnet core made of a ferromagnetic metal and mounted in the housing; at least one winding tube made of a metal or alloy; one or more coils wound on the at least one winding tube, and the at least one winding tube being jointly mounted with the electromagnet core; a removable cover plate made of metal covering the one or more coils; the electromagnet core including exposed surfaces extending through openings in the cover plate to engage with an armature when the electromagnet is activated in use.

[0009] The cover plate can be made of non-ferrous metals or alloys.

[0010] The cover plate can be made of aluminum.

[0011] An electromagnet core can be formed into a solid block.

[0012] Electromagnetic cores can be formed by machining grooves in a block of ferrous metal.

[0013] Electromagnetic cores can be formed by molding.

[0014] Electromagnetic door locks may also include luminous indicators for indicating the locked or unlocked status of the lock, wherein the exposed area of ​​the luminous indicator is made of thermoplastic rubber. Attached Figure Description

[0015] Embodiments of this utility model will be described with reference to the accompanying drawings, wherein:

[0016] Figure 1 This is a 3D diagram of an existing electromagnetic door lock.

[0017] Figure 2 This is a front view of an electromagnetic door lock;

[0018] Figure 3 It is along Figure 2 Cross-sectional view of the DD line;

[0019] Figure 4 yes Figure 2 Exploded view of the electromagnetic door lock; and

[0020] Figure 5 yes Figure 2 Perspective view of a central electromagnetic door lock. Detailed Implementation

[0021] refer to Figures 2 to 5 Embodiments of this utility model will be described based on the following parts list:

[0022] Parts list:

[0023] 1 -- left end

[0024] 2 -- Cover plate

[0025] 3 -- Winding tube and insulation material

[0026] 4 -- Coil

[0027] 5 -- Magnetic iron block core

[0028] 6 -- Aluminum casing

[0029] 7 -- Cover plate

[0030] 8 -- Printed Circuit Board (PCB)

[0031] 9 -- right end

[0032] 10 -- Thermoplastic rubber LED box

[0033] 11 -- Washers and fixing bolts

[0034] 12 -- Mounting plate

[0035] 13 -- Fixing machine screws

[0036] 14 -- Fixing machine screws

[0037] The cover plate 2 is made of metal, preferably a non-ferrous metal such as aluminum. The winding tube 3 is made of a metal such as stainless steel or aluminum.

[0038] Iron block 5 is machined from a rectangular iron billet made of soft iron, forming an "E"-shaped cross-sectional profile by machining grooves in the block. Block 5 is formed by machining methods such as milling, or by molding or joining individual iron blocks together using screws (the iron blocks are not welded together to avoid the generation of welding fumes). After formation, iron block 5 undergoes 100% surface anti-corrosion treatment.

[0039] LED box 10 is an L-shape of various sizes appearing on both visible sides of the electromagnet, and is made of thermoplastic elastomer or thermoplastic rubber that hardens when exposed to high temperatures without melting or burning.

[0040] The assembly method of an electromagnet is as follows:

[0041] A. Assemble the housing with the left end 1 and the right end 9 using screws 13, and install it onto the mounting plate 12 using washers 11 and fixing bolts.

[0042] B. Wind the wire coil 4 around the winding tube 3.

[0043] C. Place the coil and winding tube assembly into block 5 to surround the central arm of the “E” shaped cross-section.

[0044] D. Secure the core assembly to the housing 6 using the fixing screw 14.

[0045] E. Connect the coil to PCB 8 and mount the LED inside the thermoplastic rubber LED box 10.

[0046] F. Securely fasten cover plate 2 to the core assembly using silicone.

[0047] G. Cover PCB 8 with cover plate 7 and screws.

[0048] refer to Figure 5 The electromagnet 50 is now fully assembled. The exposed end of the “E”-shaped profile of block 5 extends through the slotted opening on cover plate 2, protruding slightly from the surface of the surrounding cover plate 2 to engage with the armature during use. Cover plate 2 protects the coil (out of sight) and prevents any debris or other objects from entering the electromagnet during use.

[0049] Electromagnet 50 and Figure 1 Used together with the standard type armature 120 shown.

[0050] The lock is primarily composed of low-flammability metal components. In particular, the use of a metal winding tube enhances the fire resistance of the coil, thereby improving the overall fire rating of the electromagnet.

[0051] Electromagnet 50 is 100% flame retardant, making it suitable for specific applications requiring fire-resistant locking devices.

[0052] Electromagnet 50 can be completely disassembled and repaired, which is not possible with existing electromagnets (due to their use of epoxy resin potting compounds).

[0053] The manufacturing process of electromagnet 50 does not use welding processes or epoxy resin curing that produce harmful gases. Furthermore, all components are recyclable at the end of the product's lifespan. Therefore, electromagnet 50 has a very low environmental impact throughout its entire product lifecycle (from production to discontinuation of use).

[0054] Any reference to prior art in this document should not be construed as an admission that the information is common knowledge unless otherwise stated.

[0055] Finally, it should be understood that various modifications or additions can be made to the previously described components without departing from the spirit or scope of this utility model.

Claims

1. An electromagnetic door lock, comprising: case; An electromagnet core, which is made of ferromagnetic metal and is installed in the housing; At least one winding tube made of metal or alloy; One or more coils are wound on the at least one winding tube, and the at least one winding tube is mounted together with the electromagnet core; A removable cover plate made of metal covers the one or more coils; as well as The electromagnet core includes an exposed surface that extends through an opening in the cover plate to engage with an armature when the electromagnet is activated during use.

2. The electromagnetic door lock of claim 1, wherein, The cover plate is made of non-ferrous metal or alloy.

3. The electromagnetic door lock according to claim 2, wherein, The cover plate is made of aluminum.

4. The electromagnetic door lock according to any one of claims 1-3, wherein, The electromagnet core is formed as a solid block.

5. The electromagnetic door lock according to claim 4, wherein, The electromagnet core is formed by machining grooves in an iron metal block.

6. The electromagnetic door lock according to claim 4, wherein, The electromagnet core is formed by molding.

7. The electromagnetic door lock according to any one of claims 1-3 and 5-6 further includes a light-emitting indicator, the light-emitting indicator indicating the locked or unlocked state of the electromagnetic door lock, wherein, The exposed area of ​​the luminous indicator is made of thermoplastic rubber.

8. The electromagnetic door lock according to claim 4 further includes a light-emitting indicator, the light-emitting indicator indicating the locked or unlocked state of the electromagnetic door lock, wherein, The exposed area of ​​the luminous indicator is made of thermoplastic rubber.

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