A magnetic door anti-accidental closing device and its deployment method under interlocking control

Abstract

This invention discloses a magnetic attraction device for preventing accidental closure of an interlocking control door and its deployment method, belonging to the field of industrial safety protection technology. The invention provides the following solution: the device includes a fixed mounting base and an anti-accidental closure magnetic attraction component; the fixed mounting base includes a steel plate base welded to the protective wall opposite the interlocking control door; the anti-accidental closure magnetic attraction component includes at least one permanent magnet and fasteners, the permanent magnet being anchored to the steel plate base by the fasteners, with the attraction surface facing the interlocking control door. When an operator opens the interlocking control door, the door body contacts the permanent magnet due to inertia, and is passively locked in the normally open state by the strong magnetic attraction. This invention is a purely mechanical passive structure, automatically locking upon opening, completely eliminating the safety hazards caused by accidental closure of the interlocking control door, and has significant advantages such as safety and reliability, high operational efficiency, extremely low cost, and maintenance-free operation.

Description

Technical Field

[0001] This invention relates to the field of industrial safety protection technology, and in particular to an interlocking control door anti-accidental closing magnetic suction device and its deployment method. Background Technology

[0002] In the operating areas of roller conveyors and rotating equipment in industries such as metallurgy and machinery manufacturing (e.g., areas for roller conveyor inspection and equipment maintenance in medium and heavy plate rolling mills), interlocking control doors are the core intrinsically safe interlocking devices to ensure the safety of on-site personnel. When personnel enter the hazardous area to perform inspection, testing, or maintenance work, they must manually open the interlocking control door. At this time, the system will automatically cut off the control power supply to the relevant rotating equipment, ensuring that the equipment stops operating.

[0003] However, in the complex operating environment of industrial sites, traditional interlocked control doors are easily closed automatically by external forces such as strong vibrations from large production equipment, strong winds, and unintentional collisions with personnel or materials after personnel enter the work area. Once the interlocked control door closes unexpectedly, it will instantly trigger the interlock control system, causing rotating equipment such as roller conveyors to be immediately re-energized and restarted at high speed, which can easily cause mechanical injury to personnel.

[0004] In existing technologies, the following solutions are commonly used to prevent interlocked doors from closing accidentally, but all of them have significant drawbacks: Physical latch or hook-type locking mechanism: This solution requires operators to manually insert or hook the latch after opening the door. Field tests showed that a single manual locking operation takes an average of about 15 seconds, which is cumbersome. In the event of a sudden emergency requiring rapid evacuation, this can easily delay emergency escape time. Furthermore, long-term use in dusty and vibrating industrial environments can easily cause wear, bending, or overall deformation of the mechanical latch structure, leading to locking failure.

[0005] Spring-return door closers or damping mechanisms: Although these devices can control the speed of opening or closing the door, they cannot provide sufficient normally open locking force when faced with alternating external forces such as strong winds and severe equipment vibrations. They cannot completely prevent the door from being accidentally closed by external forces, and their reliability is obviously insufficient.

[0006] Electromagnetic electronic locking systems: While this solution can achieve automated circuit control, it requires complex secondary wiring and continuous power supply in the field, as well as the configuration of precision electrical control components. This not only leads to high procurement and deployment costs, but also results in extremely high failure rates of electrical components in harsh industrial environments with high temperatures, high dust levels, and strong vibrations, making subsequent maintenance cumbersome and complex.

[0007] The aforementioned existing technical solutions all suffer from problems such as inconvenient operation, poor reliability, weak weather resistance, or excessive cost, and cannot simultaneously meet the on-site requirements of "efficient operation, absolute reliability, extremely low cost, and maintenance-free" in industrial safety production. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an interlocking control door anti-accidental closing magnetic suction device and its deployment method.

[0009] To solve the above technical problems, the technical solution of the present invention is as follows: On one hand, the present invention provides a magnetic attraction device for preventing accidental closure of an interlocking control door, comprising: a mounting base, fixedly disposed on the protective wall opposite the interlocking control door; and an anti-accidental closure magnetic attraction component, comprising fasteners and at least one permanent magnet, wherein the permanent magnet is fixedly disposed on the mounting base by the fasteners, and the attraction surface of the permanent magnet faces the interlocking control door; wherein, when the interlocking control door is in the open state, the door body of the interlocking control door is connected to the permanent magnet by magnetic attraction to lock the interlocking control door in the normally open state.

[0010] On the other hand, the present invention provides a method for deploying an interlocking control door anti-accidental closing magnetic suction device, including: Obtain the size information of the interlocked control door and the location information of the opposite protective wall, and obtain the mounting base, permanent magnet and matching fasteners of the specified specifications; Based on the obtained size information, the mounting base is matched, the permanent magnet and the steel plate base are combined, and the permanent magnet is anchored to the mounting base with fasteners to form an anti-misoperation magnetic suction component. Based on the size and location information, the installation height parameters and the contact surface deviation parameters of the anti-accidental closing magnetic suction component are determined. Based on the installation height parameters and the contact surface deviation parameters, the mounting base is fixed at a preset position on the opposite protective wall so that when the interlocked control door is opened, the door body of the interlocked control door automatically engages and locks with the anti-mis-closing magnetic component through permanent magnet attraction.

[0011] The beneficial effects of this invention are: (1) This invention directly utilizes the permanent magnet attraction of neodymium iron boron magnets combined with a scrap steel plate base to form a purely mechanical, passive, and self-adaptive passive locking component. It requires no moving parts and no power supply, fundamentally eliminating the risk of locking failure due to mechanical fatigue or electrical faults. The measured attraction force is greater than or equal to 50 kg, which is sufficient to resist normal vibrations and wind on site, completely preventing the interlocking door from closing unexpectedly.

[0012] (2) Unlike the latch-type door which requires manual alignment and operation for about 15 seconds each time, this invention utilizes the inertia of the door opening to directly adhere to the protective wall, automatically locking upon opening. The entire process requires no additional action from the operator, increasing operational efficiency by over 80%. In emergencies, personnel can quickly push the door open, and the door will automatically lock; after the operation is completed, a gentle pull will separate the door and restore normal interlocking function, greatly shortening emergency response time.

[0013] (3) The present invention adopts external welding installation, which can be adapted to more than 90% of existing industrial interlock door models without any modification to the door body, making it easy to deploy quickly and promote on a large scale. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the interlocking control door anti-accidental closing magnetic suction device provided by the present invention; Figure 2 This is a schematic diagram of the anti-accidental closing magnetic suction component in the interlocking control door anti-accidental closing magnetic suction device provided by the present invention; The components include: 1. Mounting base; 2. Permanent magnet unit; 3. Fastener unit; 4. Door body. Detailed Implementation

[0016] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Example 1: This example provides an interlocking control door anti-accidental closing magnetic suction device, see [link / reference]. Figure 1 and 2 The device includes a mounting base 1 and an anti-accidental closing magnetic suction assembly. Its overall mechanical structure and the physical cooperation relationship of each component are as follows: Mounting base 1 is mainly used to provide a high-strength mounting carrier and bear the frequent impact loads caused by the opening inertia of door 4. Its core component is a steel plate base fixed at a preset position on the protective wall opposite the interlocking control door.

[0018] The mounting base 1 is made of high-tensile-strength Q235 industrial scrap steel plate, with a rigid thickness limit of 6mm. In the deployed state, the mounting base 1 is firmly welded to the steel column or embedded iron parts of the protective wall through a welding process. The 6mm plate thickness can effectively disperse and absorb the instantaneous mechanical stress generated during the inertial impact of the gate 4, ensuring that the physical foundation of the entire device will not loosen, shift, or warp during its decades of service.

[0019] The welding process described above uses carbon dioxide gas shielded welding, and the weld thickness of the carbon dioxide gas shielded welding process is greater than or equal to 5mm, which ensures the installation stability of the mounting base 1.

[0020] The anti-accidental closing magnetic attraction component is the core actuator for achieving passive normally open locking, and specifically includes the following finely defined units: Permanent magnet unit 2: It includes at least one high-performance permanent magnet rigidly disposed on the surface of the mounting base 1, specifically defined in this embodiment as an N45 neodymium iron boron strong magnet. This magnet has extremely high remanence and coercivity, and can consistently provide a rated attraction force of greater than or equal to 50 kg in a very small volume. Its installation position is set with its geometric center 1.2 m above the ground, and its attraction surface (i.e., the magnetic pole surface exposed to the outside) faces the movement trajectory surface when the interlocked control door is opened, and the spatial position deviation between it and the limit opening surface of the door body 4 is controlled within less than or equal to 2 mm, so as to establish a uniform magnetic circuit of the entire contact surface.

[0021] Fastener unit 3 includes a high-strength standard mechanical bolt, a matching spring washer, and a lock nut. Fastener unit 3 penetrates longitudinally through a pre-drilled hole in the permanent magnet and the corresponding mounting hole in the mounting base 1, achieving high-preload thread locking via the lock nut on the back. The spring washer provides continuous axial elasticity compensation in long-term high-industrial-vibration environments, preventing structural loosening of the threads. Through this fastener unit 3, the permanent magnet unit 2 and the fixed mounting base 1 are tightly and rigidly combined into a physical whole with extremely high seismic redundancy.

[0022] When the interlocked door is open, the door body 4 (or the ferromagnetic adsorption target plate mounted on the door body 4) and the permanent magnet in the anti-accidental closing magnetic attraction assembly make zero-distance surface contact in space. Because the magnetic lines of force inside the permanent magnet penetrate the magnetic yoke of the door body 4 to form a closed low-resistivity magnetic circuit, a strong and constant holding force is generated, firmly and passively locking the interlocked door in the normally open state. This locking mechanism does not require any external air source, light source, power supply, or electronic control logic; it relies on the physical properties of the material itself to achieve absolutely reliable safety protection. This allows the door body 4 to withstand alternating vibrations caused by the operation of large machinery and strong winds, completely severing the chain of potential mechanical injury caused by accidental closing of the interlocked door triggering a power restoration.

[0023] Example 2: This example provides a method for deploying a magnetic suction device to prevent accidental closing of an interlocked door. The method specifically includes the following steps: Step S1: Obtain the size information of the interlocking control door and the location information of the opposite protective wall, and obtain the mounting base 1, permanent magnet and matching fasteners of the set specifications.

[0024] Specifically, technicians first used measuring tools to collect data on the interlocked door 4 and its surrounding physical boundaries that needed to be controlled on-site. This included: obtaining dimensional information such as the width, thickness, and material of the interlocked door 4 (verifying whether it contained ferromagnetic components; if not, ferromagnetic connectors needed to be installed at the corresponding positions on the door 4); and simultaneously, accurately measuring and obtaining information such as the relative spatial distance, surface flatness, and base material of the opposite protective wall corresponding to the outer edge of the door 4 after the interlocked door was fully opened to 90 degrees (or a predetermined opening angle).

[0025] After data acquisition, based on the requirements for seismic and impact resistance at the industrial site, the necessary hardware components are prepared: a mounting base 1 of the specified specifications is obtained (in this embodiment, it is preferable to use the end of a 6mm thick scrap Q235 steel plate left over from factory processing, taking into account both structural strength and waste utilization); a permanent magnet is obtained (preferably a high-energy-product N45 neodymium iron boron strong magnet, with a rated static attraction force set to F ≥ 50kg to ensure it can withstand on-site wind and vibration); and matching mechanical fasteners (including matching standard strong bolts, spring washers, and lock nuts).

[0026] Step S2: Based on the obtained size information, the mounting base 1 is matched and the permanent magnet and the steel plate base are combined. The permanent magnet is anchored to the mounting base 1 using fasteners to form an anti-misoperation magnetic attraction component.

[0027] Specifically, firstly, based on the interlocking control door size information and the geometric dimensions of the permanent magnet obtained in the preceding step S1, a CNC cutting machine or a flame cutting gun is used to measure and scribing the 6mm thick Q235 mounting base 1 and complete the cutting and blanking, processing it into a modular mounting plate with a set geometric shape.

[0028] Then, a fastener mounting hole is machined in the center or at a predetermined position of the cut steel plate base using a drilling machine. The N45 neodymium iron boron permanent magnet is directly placed against the surface of the cut steel plate base, and the built-in through hole of the magnet is precisely aligned with the mounting hole of the steel plate base.

[0029] Finally, a standard high-strength bolt is inserted through the permanent magnet and the steel plate base. A spring washer is placed on the back of the steel plate base and the anti-loosening nut is tightened. By applying a preload, a bidirectional locking operation is performed, which makes the permanent magnet rigidly anchored on the steel plate base, forming an integrated anti-misoperation magnetic attraction component with high seismic resistance.

[0030] Step S3: Based on the size and position information, determine the installation height parameters and the contact surface deviation parameters of the anti-accidental closing magnetic suction component.

[0031] Specifically, firstly, the vertical installation height parameter of the anti-accidental closing magnetic closure component on the protective wall is determined. To prevent overturning moment or hinge twisting when the door 4 is subjected to external force impact, in this embodiment, the installation height parameter is determined to be 1.2m from the center of the anti-accidental closing magnetic closure component to the ground. This height corresponds exactly to the height of the geometric center axis of most interlocking door bodies 4, which can make the magnetic attraction force evenly distributed.

[0032] Secondly, the deviation parameters of the magnetic attraction surface are determined. These parameters refer to the spatial tilt angle deviation and parallelism tolerance between the outer surface of the magnetic attraction component and the attraction contact surface of the door 4 when it is opened to its limit position during final welding and deployment. To ensure complete surface contact between the permanent magnet and the door 4, this embodiment strictly limits the deviation parameters of the magnetic attraction surface to a spatial position deviation of less than or equal to 2mm (including linear displacement converted from tilt angle deviation). Excessive deviation will cause localized point or line contact between the magnet and the door 4, resulting in an exponential decrease in the actual effective magnetic attraction force, failing to achieve the expected safe anti-misclosing locking effect.

[0033] Step S4: Based on the installation height parameters and the suction surface deviation parameters, fix the mounting base 1 to the preset position on the opposite protective wall so that when the interlocking control door is opened, the door body 4 of the interlocking control door will automatically engage and lock with the anti-mis-closing magnetic suction component through permanent magnet attraction.

[0034] Specifically, the technicians transported the anti-misoperation magnetic suction component generated in step S2 to the site, and placed the steel plate base at the designated deployment position on the opposite protective wall according to the installation height parameters determined in step S3 and the spatial limitation of the spatial position deviation of the suction surface.

[0035] Due to the high-frequency vibration and impact in the workshop environment, this embodiment employs industrial-grade carbon dioxide gas shielded welding to fully weld the Q235 steel plate base of the anti-misoperation magnetic chuck assembly to the pre-embedded steel structure of the protective wall. During the welding process, the carbon dioxide gas flow rate and welding current are strictly controlled to ensure full welding from all directions and a weld thickness greater than or equal to 5mm. This high-strength welding fixation ensures that the magnetic chuck assembly will not develop fatigue cracks or structural deformation and detachment at the weld joint even when subjected to long-term high-frequency impacts from the door and vibrations of the workshop foundation (such as vibrations generated by rolling mill operation and roller conveyor transport).

[0036] The operational mechanism after on-site integration and deployment is as follows: When personnel need to enter the hazardous area, they manually push open the interlocking control door without any additional manual latching. Utilizing the door's inertia upon opening, the door swings freely to the side of the protective wall. As it approaches the designated deployment position, the surface of the door automatically enters the strong magnetic field attraction range of the magnetic attraction component. The door contacts the permanent magnet's contact surface, achieving instantaneous, adaptive, passive magnetic locking. When personnel are performing inspections or maintenance within the area, the device provides a constant holding force of 50 kg or more, completely locking the door and preventing accidental closure under external force. After the work is completed and personnel evacuate to a safe area, simply applying an appropriate pulling force to gently pull the door to overcome the magnetic separation allows the interlocking control door to smoothly resume its normal closing function.

[0037] In addition to the above embodiments, the present invention may have other implementation methods; all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A magnetic suction device for preventing accidental closure of an interlocked door, characterized in that: include: Mounting base (1) is fixedly installed on the protective wall opposite the interlocking control door; The anti-accidental closing magnetic suction assembly includes a fastener and at least one permanent magnet. The permanent magnet is fixedly mounted on the mounting base (1) by the fastener, and the attraction surface of the permanent magnet faces the interlocking control door. When the interlocking control door is in the open state, the door body (4) of the interlocking control door is connected to the permanent magnet by magnetic attraction to lock the interlocking control door in the normally open state.

2. The interlocking management door anti-closing magnetic attraction device according to claim 1, characterized in that: The installation height of the anti-accidental closing magnetic suction component is 1.2m, and the spatial position deviation between the outer surface of the anti-accidental closing magnetic suction component and the suction contact surface of the door (4) when it is opened to the limit position is ≤2mm.

3. The interlocking management door anti-closing magnetic attraction device according to claim 1, characterized in that: The permanent magnet is an N45 neodymium iron boron high-strength magnet, and the attraction force of the permanent magnet is set to ≥50kg.

4. A method of deploying a magnetic attraction device for interlocking a control door against erroneous closing according to any one of claims 1-3, characterized in that: include: Obtain the size information of the interlocked control door and the location information of the opposite protective wall, and obtain the mounting base (1), permanent magnet and matching fasteners of the specified specifications; Based on the obtained size information, the steel plate base is matched, the permanent magnet and the mounting base (1) are combined, and the permanent magnet is anchored to the mounting base (1) using the fasteners to form an anti-misoperation magnetic suction component. Based on the size information and the position information, the installation height parameters and the contact surface deviation parameters of the anti-accidental closing magnetic suction component are determined; Based on the installation height parameter and the suction surface deviation parameter, the mounting base (1) is fixed to the preset position of the opposite protective wall so that when the interlocking control door is opened, the door body (4) of the interlocking control door is automatically attracted and locked by the anti-mis-closing magnetic suction component through permanent magnet attraction.

5. The method of claim 4, wherein the magnetic attraction device is a magnetic attraction device of the interlocked door control device. The matching process for the mounting base (1) based on the acquired size information includes: Based on the dimensional information, the mounting base (1) is measured and cut to size; The permanent magnet is directly placed against the surface of the mounting base (1) after cutting and blanking.

6. The method of claim 4, wherein the magnetic attraction device is a magnetic attraction device of the interlocked door control device. Fixing the steel plate base to the preset position of the opposite protective wall includes: The steel plate base of the anti-misoperation magnetic attraction component is welded and fixed to the preset position of the opposite protective wall using a welding process.

7. The method of claim 6, wherein the method further comprises: The welding process is carbon dioxide gas shielded welding.

8. The method of claim 7, wherein the method further comprises: In the aforementioned carbon dioxide gas shielded welding process, the weld thickness is controlled to be greater than or equal to 5 mm.

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