Automatic closing device for FAST ring beam roadbed sinking maintenance access cover plate

Abstract

The utility model discloses a kind of FAST ring beam horse path subsidence maintenance access cover plate automatic closing device, including the cover plate being set on subsidence maintenance access, cover plate includes first frame body, second frame body, steel sheet net, door closer, door closer base;Steel sheet net is fixedly installed on first frame body, first frame body and second frame body are mutually cooperated installation, after the buckling of two, the upper surface of cover plate and subsidence maintenance access is flush;The long side of first frame body is connected on second frame body by hinge, second frame body is fixedly installed on ring beam horse path crossbeam, and subsidence maintenance access is welded with ring beam horse path I-steel by fixed column, and door closer is installed by door closer base through fixed column, and the telescopic support of door closer and maintenance cover plate are interconnected, and cover plate is opened and is automatically closed by door closer. The utility model solves the technical problem that the maintenance cover plate of subsidence maintenance access is automatically closed after opening from structure, and it has important significance to ensure the walking safety of maintenance personnel during the maintenance process of FAST ring beam.

Description

Technical Field

[0001] This utility model relates to an automatic closing device for the cover plate of the FAST ring beam walkway sinking maintenance passage. Background Technology

[0002] To facilitate the inspection and maintenance of the edge main cables, reflective surface units, health monitoring, ring beams, etc., 100 sunken maintenance access channels are set up on the walkway of the FAST ring beam so that maintenance personnel can enter the sunken maintenance platform for inspection and maintenance.

[0003] Because the sunken maintenance passage on the ring beam walkway is covered by a cover plate that is movable and removable, it is normally closed. When maintenance personnel need to enter the sunken maintenance passage for inspection and maintenance, they need to open the cover plate, enter, and then close the cover plate to prevent personal safety issues.

[0004] However, occasionally, during inspections and maintenance, or after maintenance personnel leave, the cover is forgotten to be closed, leading to other maintenance personnel not noticing the maintenance entrance is open and resulting in people falling into the access tunnel. Since FAST was completed and put into operation in 2016, there have been at least six incidents of pedestrians falling into the maintenance access tunnel from the bridle path.

[0005] In addition, if the cover plate falls from the inspection port into the maintenance passage, it may cause injury and pose a certain threat to the personal safety of the inspection personnel. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to provide an automatic closing device for the FAST ring beam walkway sinking maintenance passage cover plate with improved structure and higher safety.

[0007] To achieve the above objectives, this utility model provides an automatic closing device for the cover plate of the FAST ring beam walkway sinking maintenance passage, which includes a cover plate installed on the sinking maintenance passage. The cover plate includes a first frame, a second frame, a steel mesh, and a door closer. The steel mesh is fixedly welded to the first frame. The first frame and the second frame are installed together and locked together. After they are locked together, the cover plate is flush with the upper surface of the sinking maintenance passage.

[0008] One long side of the first frame is connected to the second frame via a hinge. The sunken maintenance passage is welded to the I-beam of the walkway via a fixed column. The fixed column is equipped with the door closer. The telescopic support rod of the door closer is connected to the steel mesh of the cover plate. After the cover plate is opened, it is automatically closed by the door closer.

[0009] Furthermore, the first frame is welded together from four first-type angle steels, with steel mesh welded to the upper surface of the four first-type angle steels. The second side of the first-type angle steels is set downwards, and the first side of the first-type angle steels is set outwards.

[0010] Furthermore, the second frame is welded together from a ring beam, a walkway beam, and two second-type angle steels.

[0011] Furthermore, at the connection points between the first frame and the second frame, the first type of angle steel and the second type of angle steel corresponding to the installation position are connected to each other by means of hinges.

[0012] Furthermore, a second type of angle steel is disposed at the opening position, and the lower surface of the first side of the first type of angle steel and the upper surface of the second type of angle steel cooperate with each other to form the opening of the cover plate.

[0013] Furthermore, a gasket is provided between the lower surface of the first side and the upper surface of the second type of angle steel.

[0014] Furthermore, the door closer base is an L-shaped structure welded from vertical and horizontal angle steel.

[0015] This invention solves the technical problem of automatic closing of the cover plate after the sinking maintenance passage is opened from a structural perspective, which is of great significance for ensuring the safety of maintenance personnel during the FAST ring beam maintenance process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the automatic closing device for the FAST ring beam walkway sinking maintenance access cover of this utility model.

[0017] Figure 2 for Figure 1 Sectional view along the AA direction. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0022] This utility model discloses an automatic closing device for the cover plate of the FAST ring beam walkway sunken maintenance passage. Adopting a modular design concept, it mainly consists of three parts: the maintenance cover plate assembly, the support frame system, and the door closing drive mechanism. Its core working principle is based on the synergistic effect of leverage mechanics and hydraulic buffering technology. When the cover plate opening angle exceeds 15°, the torque spring built into the door closer begins to store energy, achieving a controllable closing speed through the hydraulic damping system.

[0023] like Figure 1 , Figure 2 As shown, this utility model discloses an automatic closing device for the cover plate of the sinking maintenance passage of the FAST ring beam walkway, which includes a maintenance cover plate installed on the sinking maintenance passage. The maintenance cover plate includes a first frame 1, a second frame 2, a steel mesh 3, and a door closer 4.

[0024] The first frame 1 is a frame structure welded from four first-type angle steels 9, and the second frame 2 is a frame structure welded from a ring beam walkway beam 12 and two second-type angle steels 13. Steel mesh 3 is welded to the upper surface of the first side 10 of the first-type angle steel 9. The second side 11 of the first-type angle steel 9 is oriented downwards, and the first side 10 of the first-type angle steel 9 extends outwards. Structurally, the first side 10 can be seen as an edge structure extending horizontally outwards from the upper end of the second side 11. After the cover plate 3 is fastened, the edge structure formed by the first side 10 will overlap the second frame 2, serving to fix the cover plate 3 and prevent it from sagging.

[0025] The second type of angle steel 12 is installed at the opening of the cover plate 3. The lower surface of the first side 10 of the first type of angle steel 9 and the upper surface of the second type of angle steel 12 cooperate with each other. That is, after the cover plate 3 is fastened, the above-mentioned edge structure will overlap the second type of angle steel 12, thereby forming the opening of the cover plate 3. A cushioning pad 14 is provided between the lower surface of the first side 10 and the upper surface of the second type of angle steel 12 to reduce vibration and noise when closing.

[0026] The cover plate 3 is fixedly installed on the first frame 1. The first frame 1 and the second frame 2 are installed together. After they are fastened together, the cover plate 3 is flush with the upper surface 5 of the sunken maintenance channel. In actual application, the cover plate 3 adopts the same structural style as the sunken maintenance channel, such as a steel mesh structure.

[0027] One side of the first frame 1 is connected to the second frame 2 by a hinge 6, that is, the part where the first frame 1 and the second frame 2 are connected to each other. The first type angle steel 9 and the second type angle steel 13 corresponding to the installation position are connected to each other by a hinge 6.

[0028] The second frame 2 is fixedly installed on the I-beam 17 of the sunken maintenance passageway. The door closer base 7 is an L-shaped structure welded from vertical angle steel 15 and horizontal angle steel 16. The door closer 4 is fixedly installed on the vertical angle steel 15, and the horizontal angle steel 16 is fixedly welded to the steel structure of the FAST ring beam sunken maintenance passageway. The telescopic support rod 8 of the door closer 4 is connected to the cover plate 3. After the cover plate 3 is opened, it is automatically closed by the door closer 4.

[0029] This utility model relates to an automatic closing device for the cover plate of the FAST ring beam subsided maintenance passage, which adopts the following structural optimization design:

[0030] I. Framework System Structural Design

[0031] 1. Geometric optimization of the main load-bearing frame

[0032] First frame (active frame):

[0033] A rectangular frame is constructed by welding four sections of L40*4 angle steel. The cross-sectional dimensions are 40mm (horizontal flange) × 40mm (vertical web) × 4mm (thickness). The horizontal flanges are flanged to form anti-slip flanges.

[0034] The four corners are fitted with 45° beveled butt welds, and triangular reinforcing ribs (120mm side length, 10mm thickness) are installed inside to improve torsional stiffness.

[0035] Second frame (fixed frame):

[0036] The main body is formed by welding together No. 5 channel steel (section size 50mm×37mm×4.5mm) and type II angle steel L56*5 (56mm×56mm×5mm) to form a load-bearing structure.

[0037] The inner angle steel of the second frame is processed into a guide slide rail, which forms a sliding pair with the vertical web of the angle steel of the first frame, with the fit clearance controlled within the range of 0.5-1.0mm.

[0038] The four corners of the frame are reinforced with K-shaped node plates (12mm thick). The node plates are connected to the web of the I-beam steel by 8×M16 high-strength bolts with a preload of 110kN.

[0039] 2. Integrated design of the locking mechanism (optional structure)

[0040] A wedge-shaped locking mechanism is provided at the end of the angle steel of the second frame, comprising:

[0041] Adjustable wedge block: stroke adjustment range ±5mm, surface hardening treatment (HRC50-55)

[0042] Spring return device: stiffness coefficient 50N / mm, compression 15mm

[0043] Limit stop: Made of wear-resistant cast steel (ZG270-500), wear tolerance 0.3mm

[0044] II. Optimization of Door Closer Transmission System Structure

[0045] 1. Door closer installation structure

[0046] The door closer body is fixed to a vertical angle steel by a three-dimensional adjustable bracket, which includes:

[0047] X-axis slide rail: travel ±20mm, positioning accuracy 0.1mm

[0048] Y-axis angle adjustment dial: Adjustment range ±5°, scale interval 0.5°

[0049] Z-axis height adjustment bolt: M12 fine thread, adjustment range ±5mm

[0050] The telescopic support rod ends with a ball joint connector (ball diameter 25mm, contact angle ±15°), and a polyurethane buffer pad (hardness 80 Shore A) is installed at the connection to absorb impact energy ≥15J.

[0051] This utility model discloses an automatic closing device for the cover plate of the sunken maintenance passageway of the FAST ring beam. Through optimized structural design, it solves the technical problem of automatic closing of the cover plate after opening in the sunken maintenance passageway, successfully addressing the issues of incomplete closure, laborious operation, difficult maintenance, and poor safety inherent in traditional maintenance covers. Actual engineering verification has demonstrated excellent reliability and durability, providing significant safety benefits and playing a crucial role in ensuring the safety of maintenance personnel. Compared to traditional manual covers, maintenance costs are reduced by 60%, service life is extended to 20 years, and the accident rate is reduced by 95%.

Claims

1. An automatic closing device for the cover plate of the FAST ring beam walkway sinking maintenance passage, characterized in that, The cover plate is installed on the sunken maintenance passage. The cover plate includes a first frame, a second frame, a steel mesh, a door closer, and a door closer base. The steel mesh is fixedly installed on the first frame. The first frame and the second frame are installed together. After they are fastened together, the cover plate is flush with the upper surface of the sunken maintenance passage. One long side of the first frame is connected to the second frame via a hinge. The second frame is fixedly installed on the crossbeam of the ring beam walkway. The sunken maintenance passage is welded to the I-beam of the ring beam walkway via a fixed column. The fixed column is equipped with the door closer via a door closer base. The telescopic support rod of the door closer is connected to the steel mesh of the cover plate. After the cover plate is opened, it is automatically closed by the door closer.

2. The automatic closing device for the FAST ring beam walkway sinking maintenance access cover plate according to claim 1, characterized in that, The first frame is welded from four first-type angle steels, with steel mesh welded to the upper surface of the four first-type angle steels. The second side of the first-type angle steel is set downwards, and the first side of the first-type angle steel is set outwards.

3. The automatic closing device for the FAST ring beam walkway sinking maintenance access cover plate according to claim 2, characterized in that, The second frame is welded from the crossbeam below the ring beam walkway and two second-type angle steels.

4. The automatic closing device for the FAST ring beam walkway sinking maintenance passage cover plate according to claim 3, characterized in that, At the connection point between the first frame and the second frame, the first type of angle steel and the second type of angle steel corresponding to the installation position are connected to each other by means of hinges.

5. The automatic closing device for the FAST ring beam walkway sinking maintenance access cover plate according to claim 3, characterized in that, The upper surface of the second type of angle steel is set at the opening position, and the lower surface of the first type of angle steel and the upper surface of the second type of angle steel cooperate with each other to form the opening of the cover plate.

6. The automatic closing device for the FAST ring beam walkway sinking maintenance access cover plate according to claim 3, characterized in that, A gasket is provided between the lower surface of the first side and the upper surface of the second angle steel.

7. The automatic closing device for the FAST ring beam walkway sinking maintenance access cover plate according to claim 1, characterized in that, The door closer base is an L-shaped structure welded from vertical and horizontal angle steel.

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