Electric suction device of display box and connecting and mounting method of display box and inner girder

Abstract

The invention relates to an electric suction device of a display box and a connecting and mounting method of the display box and an inner girder, and belongs to the field of revolving door auxiliary equipment. The display box electric suction device comprises a sliding rail, a display box connecting assembly and an electromagnetic lock assembly. The display box connecting assembly and the electromagnetic lock assembly are both in sliding connection with the sliding rail, the display box connecting assembly is used for being fixedly connected with a display box, and the electromagnetic lock assembly is fixedly connected with an inner girder; the electromagnetic lock assembly is detachably connected with the display box connecting assembly, so that selective attraction and separation actions of the electromagnetic lock assembly and the display box connecting assembly are achieved. The moving routes and the arrangement directions of the display box connecting assembly and the electromagnetic lock assembly are limited through the sliding rails, deflection caused by collision is avoided after multiple times of suction, and the reliability of subsequent suction is guaranteed. The connecting assembly, the electromagnetic lock assembly and the sliding rail are in modular design, the disassembly and assembly difficulty is effectively reduced, and the disassembly and assembly efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of revolving door auxiliary equipment, specifically relating to an electric suction device for display cases and a method for connecting and installing the display case with the inner beam. Background Technology

[0002] Revolving doors, as a door structure that combines passage, decoration, and energy conservation, are widely used in large public buildings such as shopping malls, hotels, and airports. To enhance aesthetics and space utilization, some revolving doors have display cases on the sides to support decorative components, advertising signs, and other parts. The stability and flexibility of the connection between the display cases and the revolving door and the building's internal beams directly affect the revolving door's operational safety and user experience.

[0003] When pedestrians are squeezed or trapped during the operation of a revolving door, the fixed display cases cannot shift to avoid the accident, easily leading to pedestrian injuries and posing a structural safety hazard. Therefore, a three-wing revolving door with retractable sliding doors was designed, as described in patent application number 202223546306.6. This revolving door includes three rotating door panels, a top panel, and a bottom panel. Linear guide rails parallel to the rotating door panels are fixedly connected to the top and bottom panels, and sliders are mounted on the linear guide rails. The rotating door panels are connected to the sliders, allowing them to slide inward along the linear guide rails. This patent, through the inward-moving rotating door panels, fundamentally avoids pedestrian collision accidents and effectively improves the safety of the revolving door.

[0004] To secure the door leaf during normal operation and prevent its movement, a rotary wing deflection locking and stabilizing device (application number 202321759568.2) was designed. This device includes a curved display case with a double rocker mechanism connected to it. A connecting rod in the double rocker mechanism is fixed to the movable door leaf. The double rocker mechanism is equipped with a locking mechanism for securing the mechanism. After resetting, the electromagnet fixed to the end of the frame plate and the magnetic base fixed to the middle of rocker arm II engage with each other, immediately locking the movable door leaf after resetting and preventing malfunctions caused by the door leaf swinging back and forth.

[0005] This attraction-locking method solves the reset and fixation problem to some extent. However, the electromagnet and magnetic base are fixed to the hinged frame plate and rocker arm II respectively. The trajectory of the electromagnet and magnetic base is not along a prescribed straight path, but along an arc. This means that during installation, their positions need to be constantly adjusted to achieve the required attraction effect. Because the electromagnet and magnetic base move along an arc during attraction and locking, the force generated when they collide is multi-directional. This causes the electromagnet or magnetic base to easily shift after multiple attraction impacts, leading to subsequent attraction failures and requiring disassembly and repair, causing considerable inconvenience to subsequent operation. Summary of the Invention

[0006] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide an electric suction-closing device for display cases and a method for connecting and installing the display case to the inner beam. In this invention, the movement path and orientation of the display case connecting components and the electromagnetic lock components are limited by a slide rail, preventing deflection due to impact after multiple suctions and ensuring the reliability of subsequent suctions. The connecting components, electromagnetic lock components, and slide rails are modularly designed, effectively reducing the difficulty of disassembly and assembly and improving efficiency.

[0007] The technical solution adopted by this invention to solve its existing problems is: An electric suction closing device for a display case includes a slide rail, a display case connecting assembly, and an electromagnetic lock assembly; Both the display case connecting assembly and the electromagnetic lock assembly are slidably connected to the slide rail. The display case connecting assembly is used for fixed connection with the display case, and the electromagnetic lock assembly is fixedly connected to the inner beam. The electromagnetic lock assembly and the display case connection assembly are detachably connected, thereby enabling selective engagement and disengagement of the two.

[0008] Furthermore, the electromagnetic lock assembly includes an electromagnet, and the display case connection assembly includes a magnetic coupling element adapted to the electromagnet. The electromagnetic lock assembly and the display case connection assembly are attracted and separated by controlling the on and off state of the electromagnet.

[0009] Furthermore, the slide rail has a rod-shaped structure, and its two ends are fixedly assembled with the inner beam through slide rail supports.

[0010] Furthermore, a spring is fitted onto the slide rail, and the spring is clamped between the display case connecting assembly and the electromagnetic lock assembly.

[0011] Furthermore, the display case connection assembly includes interconnected box-type bearing mounting and positioning components and a display case hoisting connection plate. The box-type bearing mounting and positioning components serve as magnetic coupling components, and the display case hoisting connection plate is fixedly connected to the display case.

[0012] Furthermore, the box-type bearing mounting and positioning component adopts an L-shaped corner plate structure. The horizontal surface of the L-shaped corner plate is detachably connected to the display box hoisting connection plate by bolts. A through hole is opened on the vertical surface of the L-shaped corner plate, which is fitted with the slide rail.

[0013] Furthermore, the display case hoisting connection plate is installed below the horizontal plane of the box bearing mounting and positioning component, and a first box linear bearing is fixedly installed above the horizontal plane of the box bearing mounting and positioning component. The first box linear bearing is sleeved and fitted with the slide rail.

[0014] Furthermore, the electromagnetic lock assembly includes an electromagnetic lock fixing component and an electromagnet. The electromagnet is disposed at one end of the electromagnetic lock fixing component facing the display case connecting component. The electromagnetic lock fixing component is sleeved with the slide rail and is detachably connected to the inner beam.

[0015] Furthermore, the end of the electromagnetic lock fixing component facing away from the electromagnet is provided with an inner beam connector, which is detachably connected to the inner beam by bolts.

[0016] Furthermore, the electromagnetic lock fixing component adopts an L-shaped angle plate structure. The vertical surface of the L-shaped angle plate is fixedly connected to the electromagnet, and a second box-type linear bearing is fixedly installed on the horizontal surface of the L-shaped angle plate. The second box-type linear bearing is sleeved and fitted with the slide rail.

[0017] A method for connecting and installing a display case to a main beam includes the following steps: S01. Pre-installed electric suction device for display cases: Install the display case hoisting connection plate below the horizontal plane of the box bearing mounting and positioning component, and achieve a detachable connection by bolts. Tighten the fasteners but leave a fine adjustment gap. Next, install the inner beam connector on the end of the electromagnetic lock fixing component facing away from the electromagnet on the vertical surface, and detachably connect the first connecting plate to the vertical surface of the electromagnetic lock fixing component with bolts. S02. Fixing of display cases and connecting components and overall hoisting: Align the pre-assembled display case connection plate with the preset lifting position of the display case, and fix the two together with bolts. Using hoisting equipment, the display box with the fixed display box connecting components is slowly lifted and gradually brought closer to the inner beam. The slide rail support of the slide rail assembly is precisely aligned with the inner beam support plate and initially placed on the support plate. The position of the display box is then finely adjusted using hoisting equipment to ensure that the display box is at the preset installation height and level, while ensuring that the slide rail remains level. S03, Positioning and Component Fixing Bolts securely connect the slide rail support to the inner beam support plate; After the display case is adjusted to the preset position of the revolving door and positioned, it is bolted to the inner beam through the second connecting plate of the inner beam connector, and the electromagnetic lock assembly is firmly fixed on the inner beam, thus completing the overall installation.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) By precisely controlling the on and off of the electromagnet, when a pedestrian is squeezed or pinched during the operation of the revolving door, the power can be quickly cut off to release the attraction, allowing the display box to slide inward along the slide rail, increasing the distance between the curved wall of the display box and the fixed curved wall of the revolving door, actively avoiding pedestrians, eliminating pinching injuries from a structural perspective, and greatly improving the safety of equipment operation.

[0019] (2) By adding a spring between the display box connecting component and the electromagnetic lock component, the problem that the electromagnet may be attracted again due to inertia or magnetic residue after the power is cut off in the prior art is solved. The spring can quickly push the display box connecting component at the moment of power failure to ensure complete separation, further guarantee the stability of the pedestrian avoidance space and avoid the risk of secondary clamping.

[0020] (3) The electromagnetic lock assembly and the slide rail are in sliding fit, and the inner beam is detachably connected to the inner beam through the inner beam connector. Compared with the defects of the existing technology where the position of the attracting component is fixed and cannot be adjusted, this solution can adjust the position of the electromagnet according to the retraction distance of the display box after the display box is positioned, accurately match the installation requirements, adapt to the installation layout of different specifications of display boxes and inner beams, and has stronger versatility.

[0021] (4) The overall structure adopts multiple detachable bolt connections, including the L-shaped corner plate and the display box hoisting connection plate, the double connection plate structure of the inner beam connection piece, the connection between the electromagnetic lock fixing piece and the inner beam, etc. Compared with the integrated or welded fixed structure in the existing technology, it is convenient for the equipment to be assembled, disassembled and later maintained and repaired, reducing the operation and maintenance cost.

[0022] (5) The display box connecting component and the electromagnetic lock component are respectively connected to the slide rail through the first and second box-type linear bearings. Compared with the problem of large frictional resistance and easy jamming of ordinary sliding pairs, the box-type linear bearing can effectively reduce sliding friction, ensuring that the sliding action of the display box during suction positioning and emergency separation is smooth and stable, and avoiding the impact of jamming on the safety avoidance response speed or positioning accuracy.

[0023] (6) Through the guiding effect of the slide rail, the electromagnet and the magnetic component are precisely connected. After being powered on, the two can be tightly attracted, providing stable positioning support for the display box and ensuring that the display box will not be displaced when the revolving door is running normally. Compared with positioning methods such as mechanical buckles, the attraction stability is stronger, and the control method is simple and the response is fast.

[0024] (7) The L-shaped corner plate is used as the mounting and positioning part of the box bearing and the fixing part of the electromagnetic lock, which realizes the high integration of structural functions. The L-shaped corner plate not only undertakes the installation function of connecting the parts and cooperating with the slide rail, but also serves as the function of magnetic parts or electromagnet fixing seat. Compared with the existing technology, the overall structure is greatly simplified, the number of parts is reduced, and the processing and assembly costs are reduced. At the same time, the compact structural design is more suitable for the limited installation space between the display box and the inner beam, improving the space utilization rate.

[0025] (8) The electric suction device for the display case is installed in a modular manner to connect the display case to the inner beam. There is no need to repeatedly adjust the position of the electromagnet, which effectively reduces the installation difficulty and improves the installation efficiency. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a first structural diagram of the assembly of an electric suction device for a display case and an inner beam according to the present invention. Figure 2 This is a second structural diagram of the assembly of the electric suction device for display cases and the inner beam according to the present invention. Figure 3 This is a structural diagram of an electric suction device for display cases according to the present invention. Figure 4 This is a structural diagram of the slide rail in an electric suction device for display cases according to the present invention. Figure 5 This is a structural diagram of the display case connection component in an electric suction device for display cases according to the present invention. Figure 6 for Figure 5 The exploded diagram, Figure 7 This is a structural diagram of the electromagnetic lock assembly in an electric suction device for display cases according to the present invention. Figure 8 for Figure 7 The exploded diagram.

[0028] In the diagram: 1-slide rail, 2-slide rail support, 3-box bearing mounting and positioning component, 4-display box hoisting connecting plate, 5-first box linear bearing, 6-electromagnetic lock fixing component, 7-electromagnet, 8-inner beam connecting component, 801-first connecting plate, 802-second connecting plate, 9-second box linear bearing, 10-spring, 11-inner beam, 12-inner beam support plate. Detailed Implementation

[0029] The attached figure shows the preferred embodiment of this electric suction device for display cases. The invention will be further described in detail below with reference to the attached figure.

[0030] Depend on Figures 1 to 3 As shown, an electric suction device for display cases includes a slide rail 1, a display case connecting assembly, and an electromagnetic lock assembly.

[0031] Both the display case connecting assembly and the electromagnetic lock assembly are slidably connected to the slide rail 1. The display case connecting assembly is used for fixed connection with the display case, and the electromagnetic lock assembly is fixedly connected to the inner beam 11. The electromagnetic lock assembly and the display case connecting assembly are detachably connected, thereby realizing selective engagement and disengagement of the two.

[0032] The electromagnetic lock assembly includes an electromagnet 7, and the display case connection assembly includes a magnetic coupling component adapted to the electromagnet 7. The electromagnetic lock assembly and the display case connection assembly are attracted and separated by controlling the on and off states of the electromagnet 7.

[0033] Depend on Figure 4 As shown, the slide rail 1 has a rod-shaped structure with slide rail supports 2 at both ends. An inner beam support plate 12 is fixed on the inner beam 11, and the slide rail supports 2 are fixedly installed above the inner beam support plate 12.

[0034] Depend on Figure 5 as well as Figure 6 As shown, the display case connection assembly includes a box-type bearing mounting and positioning component 3 and a display case hoisting connection plate 4 that are connected to each other. The box-type bearing mounting and positioning component 3 serves as a magnetic coupling component, and the display case hoisting connection plate 4 is fixedly connected to the display case.

[0035] In this embodiment, the box bearing mounting and positioning component 3 adopts an L-shaped corner plate structure. The horizontal surface of the L-shaped corner plate is detachably connected to the display box hoisting connection plate 4 by bolts. A through hole is provided on the vertical surface of the L-shaped corner plate, and the through hole is sleeved with the slide rail 1.

[0036] The display case hoisting connection plate 4 is installed below the horizontal plane of the box bearing mounting and positioning component 3. A first box linear bearing 5 is fixedly installed above the horizontal plane of the box bearing mounting and positioning component 3. The first box linear bearing 5 is sleeved and fitted with the slide rail 1.

[0037] Depend on Figure 7 as well as Figure 8 As shown, the electromagnetic lock assembly includes an electromagnetic lock fixing member 6 and an electromagnet 7. The electromagnet 7 is disposed at one end of the electromagnetic lock fixing member 6 facing the display box connecting assembly. The electromagnetic lock fixing member 6 is sleeved with the slide rail 1, and the electromagnetic lock fixing member 6 is detachably connected to the inner beam 11.

[0038] The electromagnetic lock fixing component 6 adopts an L-shaped corner plate structure. The vertical surface of the L-shaped corner plate is fixedly connected to the electromagnet 7. A second box-type linear bearing 9 is fixedly installed on the horizontal surface of the L-shaped corner plate. The second box-type linear bearing 9 is sleeved and fitted with the slide rail 1.

[0039] The electromagnetic lock fixing component 6 has an inner beam connector 8 at one end of its vertical surface opposite to the electromagnet 7. The inner beam connector 8 is detachably connected to the inner beam 11 by bolts. In this embodiment, the beam connector 8 includes a first connecting plate 801 and a second connecting plate 802 that are connected to each other. The first connecting plate 801 is detachably connected to the vertical surface of the electromagnetic lock fixing component 6 by bolts, and the second connecting plate 802 is detachably connected to the inner beam 11 by bolts.

[0040] A spring 10 is fitted on the slide rail 1, and the spring 10 is clamped between the display box connecting assembly and the electromagnetic lock assembly.

[0041] After assembling the slide rail 1, display case connecting assembly, and electromagnetic lock assembly into a display case electric suction device, the display case lifting connecting plate 4 is fixedly connected to the display case. Next, the display case and inner beam 11 are lifted and their positions adjusted. Once the display case is positioned, the slide rail support 2 is fixedly connected to the inner beam 11. Then, by adjusting the retraction distance of the display case, the electromagnetic lock assembly is slid to adjust the position of the electromagnet 7. After the electromagnet 7 is positioned, the electromagnetic lock assembly is fixedly connected to the inner beam via the inner beam connecting piece 8.

[0042] A method for connecting and installing a display case to a main beam includes the following steps: S01. Pre-installed electric suction device for display cases: Install the display case hoisting connection plate 4 below the horizontal plane of the box bearing mounting and positioning part 3, and achieve a detachable connection by bolts. Tighten the fasteners but leave a fine adjustment gap. Next, the inner beam connector 8 is installed on the vertical side of the electromagnetic lock fixing part 6 away from the electromagnet 7, and the first connecting plate 801 is detachably connected to the vertical side of the electromagnetic lock fixing part 6 by bolts. S02. Fixing of display cases and connecting components and overall hoisting: Align the pre-assembled display case connection plate 4 with the preset lifting position of the display case, and fix the two together with bolts. Tighten the fasteners to ensure a firm connection and no relative displacement. During the connection process, the display case must be placed horizontally to avoid uneven stress on the components caused by tilting. Using hoisting equipment, the display case with the fixed display case connecting components is slowly lifted. The hoisting posture is adjusted so that the display case connecting components, spring 10, and electromagnetic lock components on the slide rail 1 move synchronously with the display case, gradually approaching the inner beam 11. The slide rail support 2 of the slide rail assembly is precisely aligned with the inner beam support plate 12 and initially placed on the support plate. The position of the display case is then finely adjusted using hoisting equipment to ensure that the display case is at the preset installation height and level, while ensuring that the slide rail 1 remains level and that there is no jamming of any sliding components. S03, Positioning and Component Fixing Bolts are used to fix the slide rail support 2 to the inner beam support plate 12. During the tightening process, the level of the slide rail needs to be checked repeatedly to avoid uneven tightening force that could cause the slide rail to deform. This ensures that the slide rail is installed firmly and provides a stable foundation for the subsequent sliding of components. After the display case is adjusted to the preset installation position and positioned, the preset installation position of the display case is to move the display case to the designated area of ​​the revolving door. After the display case is in place, it is bolted to the inner beam 11 through the second connecting plate 802 of the inner beam connector 8. The fasteners are tightened to firmly fix the electromagnetic lock assembly on the inner beam 11, completing the positioning and fixing of the electromagnetic lock assembly. At this time, the spring 10 is still in the natural state or slightly pre-compressed state to meet the suction and buffering requirements. SO4, Debugging and Acceptance: Connect the power supply line to electromagnet 7 and conduct a power-on / off test. When powered on, the electromagnet can engage with the box bearing mounting and positioning part 3. The engagement process is smooth and without impact, and the spring is moderately compressed. When powered off, the electromagnet's attraction disappears, the spring returns to its original position, and the display box separates from the electromagnetic lock assembly, returning to its initial position. The separation action is smooth and without jamming. Check the positioning accuracy of the display case after it is engaged to ensure it matches the preset position; test the sliding stroke of the display case along the slide rail to ensure it meets the design requirements; confirm that the electromagnet's engaging force meets the display case's fixing requirements and there is no risk of it falling off; complete the overall installation after the debugging is qualified.

[0043] In the initial state of use, the display case connecting assembly and the electromagnetic lock assembly are attracted to each other to position the display case, and the revolving door operates normally. When a pedestrian is accidentally squeezed or trapped during the operation of the revolving door, the electromagnet 7 is de-energized, releasing the attraction to the display case connecting assembly. The display case slides along the slide rail 1, moves inward, and increases the distance between the curved wall of the display case and the fixed curved wall of the revolving door, thus avoiding pedestrians and ensuring their safety.

[0044] By setting the spring 10, the box connecting assembly can be quickly pushed out when the electromagnet 7 is de-energized, so as to separate the two and avoid the two from being attracted together again after the electromagnet 7 is de-energized.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A display box electric suction device, characterized in that: It comprises a sliding rail (1), a display box connecting assembly and an electromagnetic lock assembly; The display box connecting assembly and the electromagnetic lock assembly are both in sliding connection with the sliding rail (1), the display box connecting assembly is used for fixed connection with a display box, and the electromagnetic lock assembly is fixedly connected with an inner girder (11); The electromagnetic lock assembly and the display box connecting assembly are detachably connected, so as to realize selective suction and separation actions of the two.

2. The display box electric suction device according to claim 1, characterized in that: The electromagnetic lock assembly comprises an electromagnet (7), and the display box connecting assembly comprises a magnetic fitting matched with the electromagnet (7), and the suction and separation of the electromagnetic lock assembly and the display box connecting assembly are realized through on-off control of the electromagnet (7).

3. The display box electric suction device according to claim 2, characterized in that: The sliding rail (1) is in a rod structure, and both ends thereof are fixedly assembled with the inner girder (11) through a sliding rail support (2); A spring (10) is sleeved on the sliding rail (1), and the spring (10) is clamped between the display box connecting assembly and the electromagnetic lock assembly.

4. The display box electric suction device according to claim 3, characterized in that: The display box connecting assembly comprises a box bearing mounting positioning piece (3) and a display box hoisting connecting plate (4) connected with each other, the box bearing mounting positioning piece (3) is used as a magnetic fitting, and the display box hoisting connecting plate (4) is fixedly connected with a display box.

5. The display box electric suction device according to claim 4, characterized in that: The box bearing mounting positioning piece (3) adopts an L-shaped angle plate structure, a horizontal plane of the L-shaped angle plate is detachably connected with the display box hoisting connecting plate (4) through a bolt, and a through hole is formed in a vertical plane of the L-shaped angle plate, and the through hole is sleeved with the sliding rail (1).

6. The display box electric suction device according to claim 5, characterized in that: The display box hoisting connecting plate (4) is installed below the horizontal plane of the box bearing mounting positioning piece (3), a first box linear bearing (5) is fixedly arranged above the horizontal plane of the box bearing mounting positioning piece (3), and the first box linear bearing (5) is sleeved with the sliding rail (1).

7. The display box electric suction device according to claim 3, characterized in that: The electromagnetic lock assembly comprises an electromagnetic lock fixing piece (6) and an electromagnet (7), the electromagnet (7) is arranged at one end of the electromagnetic lock fixing piece (6) facing the display box connecting assembly, the electromagnetic lock fixing piece (6) is sleeved with the sliding rail (1), and the electromagnetic lock fixing piece (6) is detachably connected with the inner girder (11).

8. The display box electric suction device according to claim 7, characterized in that: An inner girder connecting piece (8) is arranged at one end of the electromagnetic lock fixing piece (6) away from the electromagnet (7), and the inner girder connecting piece (8) is detachably connected with the inner girder (11) through a bolt.

9. The display box electric suction device according to claim 7, characterized in that: The electromagnetic lock fixing part (6) adopts an L-shaped angle plate structure, the vertical surface of the L-shaped angle plate is fixedly connected with the electromagnet (7), and the horizontal surface of the L-shaped angle plate is fixedly provided with a second box-type linear bearing (9), and the second box-type linear bearing (9) is sleeved with the slide rail (1).

10. A method of connecting and installing a display case to a girder, characterized by, The method comprises the following steps: S01, pre-installation of the exhibition box electric suction device: Install the exhibition box hoisting connecting plate (4) below the horizontal surface of the box bearing installation positioning part (3), realize detachable connection through bolts, tighten the fasteners but reserve a slight adjustment gap; Then install the inner girder connecting part (8) at the end of the vertical surface of the electromagnetic lock fixing part (6) away from the electromagnet (7), and detachably connect the first connecting plate (801) with the vertical surface of the electromagnetic lock fixing part (6) through bolts; S02, fixation of the exhibition box and the connecting assembly and overall hoisting: Align the exhibition box hoisting connecting plate (4) in the pre-installed exhibition box connecting assembly with the preset hoisting position of the exhibition box, and realize fixed connection of the two through bolts; Slowly hoist the exhibition box with the exhibition box connecting assembly fixed thereon by means of hoisting equipment, gradually approach the inner girder (11), accurately align the slide rail support (2) of the slide rail assembly with the inner girder supporting plate (12), initially place on the supporting plate, adjust the position of the exhibition box through the hoisting equipment, so that the exhibition box is at the preset installation height and horizontal state, and at the same time, ensure that the slide rail (1) remains horizontal; S03, position positioning and assembly fixation Bolts are used to fixedly connect the slide rail support (2) with the inner girder supporting plate (12); After the exhibition box is adjusted to the preset position of the revolving door and positioned, the second connecting plate (802) of the inner girder connecting part (8) is bolted with the inner girder (11), the electromagnetic lock assembly is firmly fixed on the inner girder (11), and the overall installation work is completed.

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