A safety manhole for a coal conveyor belt

Abstract

This utility model belongs to the technical field of coal conveying equipment, and in particular relates to a safety manhole door for a coal conveyor belt conveyor. The manhole door includes a belt conveyor body, a sealing assembly, and an installation mechanism. The outer frame of the belt conveyor body has mounting holes; the installation mechanism includes a door frame inserted into the mounting holes, with slots fixedly installed at the top and bottom of one side of the door frame; the sealing assembly includes a door panel hinged to the door frame, with an adjusting box fixedly connected to the inner wall of the door panel. Two symmetrically arranged moving blocks are slidably connected to the inner wall of the adjusting box, with insert rods fixedly connected to opposite ends of the moving blocks. Sliding sleeves are slidably connected to the outer walls of the insert rods, and the opposite ends of the pair of insert rods are respectively inserted into the slots. This manhole door uses a rotating wheel to drive a worm gear transmission mechanism, which in turn drives a gear and rack to mesh, achieving synchronous extension and retraction of the insert rods, thus solving the inconvenience and safety hazards of existing manhole door fixing methods.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal conveying equipment, and in particular relates to a safety manhole door for a coal conveyor belt. Background Technology

[0002] In industrial settings involving coal transportation, such as thermal power plants, coal mines, and ports, coal conveyor belts are the core equipment for achieving continuous and efficient coal transportation. The body of a coal conveyor belt is mostly a closed or semi-closed steel structure frame. In order to facilitate equipment maintenance, internal cleaning, and emergency rescue, manhole doors need to be installed at specific locations on the conveyor body. These doors serve as passageways for personnel and tools, and are also important protective structures to ensure the safety of internal operations and prevent the intrusion of external foreign objects.

[0003] Most manhole doors are now fixed with bolts or clips. While clips make it convenient for people to enter and exit, they are not very effective. Vibrations during equipment operation can cause the clips to easily detach from the slots. If personnel accidentally open the manhole door by using the clips while the conveyor belt is running, serious accidents such as being caught in or falling can easily occur. Bolts are the second most common method. Although bolts are strong, they are inconvenient to use each time the manhole door is opened or closed, requiring the tightening of multiple bolts and taking a long time. Utility Model Content

[0004] In view of the technical problems existing in the background art, this utility model provides a safety manhole door for a coal conveyor belt.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A safety manhole door for a coal conveyor belt includes a conveyor body, a sealing assembly, and an installation mechanism. The outer frame of the conveyor body has an installation hole. The installation mechanism includes a door frame, which is inserted into the installation hole. Slots are fixedly installed on the top and bottom of one side of the door frame. The enclosure includes a door panel, one end of which is hinged to the door frame via a pair of hinges. An adjustment box is fixedly connected to the inner wall of the door panel. Two symmetrically arranged moving blocks are slidably connected to the inner wall of the adjustment box. Insert rods are fixedly connected to the opposite ends of the two moving blocks. Sliding sleeves are slidably connected to the outer walls of the insert rods. The bottom end of the sliding sleeves is fixedly connected to the door panel. The opposite ends of the pair of insert rods are respectively inserted into slots.

[0006] Optionally, racks are fixedly installed on the opposite ends of a pair of moving blocks, and the racks are mirror images of each other.

[0007] Optionally, a control box is fixedly installed on the outside of the door panel, and a worm gear is rotatably connected inside the control box. The central shaft of the worm gear passes through the door panel and is rotatably connected to the door panel.

[0008] Optionally, a gear is fixedly connected to one end of the worm gear's central shaft inside the door panel, and the gear meshes with the rack.

[0009] Optionally, a worm gear is rotatably connected to one side of the bottom of the control box. The worm gear passes through the control box and meshes with the worm wheel. A rotating wheel is fixedly connected to the end of the worm gear away from the control box.

[0010] Optionally, a sealing strip is installed on the inner outer edge of the door panel, with one side of the sealing strip abutting against the outer side of the door frame.

[0011] Optionally, the outer side of the door frame is provided with several connection holes, a connecting bracket is fixedly connected to one side of the door frame, a limit switch is fixedly connected to the inner side of the connecting bracket, and a stop bar is fixedly connected to the outer end of the door panel, with one side of the stop bar abutting against the trigger end of the limit switch.

[0012] This utility model has the following advantages and beneficial effects: This safety manhole door for coal conveyor belts effectively solves the problems of poor fixing effect and easy detachment due to vibration of traditional buckle fixing methods by mechanically fixing it through the insertion of a rod and slot, combined with a worm gear self-locking mechanism. The design of controlling the extension and retraction of the rod by rotating the wheel avoids the cumbersome process of tightening multiple bolts required by traditional bolt fixing, significantly shortening the opening and closing time and improving work efficiency. The safety interlock device of limit switch and stop bar solves the safety hazard of the lack of anti-misoperation mechanism in traditional manhole doors. The conveyor belt cannot start when the door is not closed properly. The whole system achieves firm fixing, convenient operation and safety protection, and is suitable for the safety requirements of manhole doors of various coal conveyor belts. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the safety manhole door for a coal conveyor belt of this utility model; Figure 2 This utility model Figure 1 A magnified view of a section at point A in the middle; Figure 3 This diagram shows the closed state of the safety manhole door of the coal conveyor belt of this utility model; Figure 4 This is a diagram showing the open state of the safety manhole door of the coal conveyor belt of this utility model; Figure 5 This is a partial view of the safety manhole door for a coal conveyor belt of this utility model. Figure 1 ; Figure 6 This is a partial view of the safety manhole door for a coal conveyor belt of this utility model. Figure 2 .

[0014] Reference numerals: 1. Conveyor body; 2. Mounting hole; 3. Enclosure assembly; 301. Door panel; 302. Control box; 303. Turning wheel; 304. Stop bar; 305. Sealing strip; 306. Adjustment box; 307. Sliding sleeve; 308. Insert rod; 309. Gear; 310. Moving block; 311. Rack; 312. Worm gear; 313. Worm; 4. Mounting mechanism; 401. Door frame; 402. Connecting bracket; 403. Limit switch; 404. Connecting hole; 405. Slot. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] Example like Figures 1-6 As shown, a safety manhole door for a coal conveyor belt includes a belt conveyor body 1, a sealing component 3, and an installation mechanism 4. The outer frame of the belt conveyor body 1 has an installation hole 2. The installation mechanism 4 includes a door frame 401, which is inserted into the installation hole 2. The top and bottom ends of the inner side of the door frame 401 are fixedly installed with slots 405. The enclosure component 3 includes a door panel 301. One end of the door panel 301 near the door frame 401 is hinged to the door frame 401 by a pair of hinges. An adjustment box 306 is fixedly connected to the inner wall of the door panel 301. Two symmetrically arranged moving blocks 310 are slidably connected to the inner wall of the adjustment box 306. Insert rods 308 are fixedly connected to the opposite ends of the two moving blocks 310. Sliding sleeves 307 are slidably connected to the outer wall of the insert rods 308. The bottom end of the sliding sleeves 307 is fixedly connected to the door panel 301. The opposite ends of the pair of insert rods 308 are respectively inserted into slots 405.

[0018] Furthermore, racks 311 are fixedly installed on the opposing ends of a pair of movable blocks 310. The racks 311 are mirror images of each other. The racks 311 on the opposing ends of the movable blocks 310 are mirror images of each other and can move synchronously in opposite directions under the drive of gear 309. This ensures that a pair of insert rods 308 extend or retract at the same time, avoids the door panel 301 becoming unbalanced due to the movement of one side of the insert rod 308, improves the synchronicity and stability of the door panel 301 fixation, and prevents the insert rod 308 from deviating from the slot 405 docking.

[0019] Furthermore, a control box 302 is fixedly installed on the outside of the door panel 301. A worm gear 312 is rotatably connected inside the control box 302. The central shaft of the worm gear 312 passes through the door panel 301 and is rotatably connected to the door panel 301. The control box 302 on the outside of the door panel 301 can protect the worm gear 312 from external coal dust and impurities, and avoid transmission failure.

[0020] Furthermore, a gear 309 is fixedly connected to one end of the central shaft of the worm gear 312 located inside the door panel 301. The gear 309 meshes with the rack 311. The worm gear 312 connects to the gear 309, which can transmit power to drive the gear 309 to rotate, providing a power transmission basis for the extension and retraction of the insertion rod 308. At the same time, it changes the direction of power transmission to adapt to the installation layout of the control box 302 and the adjustment box 306. The gear 309 in the adjustment box 306 meshes with the racks 311 on both sides, which can convert the rotational motion of a single power source into the linear motion of two moving blocks 310, realizing the synchronous drive of a pair of insertion rods 308. There is no need to adjust the insertion rods 308 separately, simplifying the operation steps.

[0021] Furthermore, a worm gear 313 is rotatably connected to one side of the bottom of the control box 302. The worm gear 313 passes through the control box 302 and meshes with the worm wheel 312. A rotating wheel 303 is fixedly connected to the end of the worm gear 313 away from the control box 302. The meshing of the worm gear 313 and the worm wheel 312 inside the control box 302 has a reverse self-locking property, which can prevent the gear 309 from rotating accidentally due to vibration, ensuring that the insertion rod 308 is stably inserted into the slot 405 and preventing the door panel 301 from loosening accidentally. The rotating wheel 303 on the bottom side of the control box 302 provides the operator with a convenient force-generating component. Rotating the rotating wheel 303 can drive the gear 309 to rotate through the worm gear 313 and the worm wheel 312, thereby controlling the action of the insertion rod 308. No special tools are required, and the operation is intuitive and labor-saving. Especially when closing the door panel 301 after maintenance, it can be quickly fixed, improving work efficiency.

[0022] Furthermore, a sealing strip 305 is embedded in the inner outer edge of the door panel 301. One side of the sealing strip 305 abuts against the outer side of the door frame 401. The sealing strip 305 on the inner outer edge of the door panel 301 abuts against the outer side of the door frame 401, which can fill the gap between the door panel 301 and the door frame 401, effectively blocking the leakage of coal dust generated during coal transportation and reducing pollution to the surrounding environment. At the same time, the sealing strip 305 has a certain degree of elasticity, which can buffer the impact force when the door panel 301 is closed, avoid the door panel 301 and the door frame 401 from direct collision and wear, and extend the service life of the components.

[0023] Furthermore, the outer side of the door frame 401 is provided with several connection holes 404. A connecting frame 402 is fixedly connected to one side of the door frame 401, and a limit switch 403 is fixedly connected to the inner side of the connecting frame 402. A stop bar 304 is fixedly connected to the outer end of the door panel 301. One side of the stop bar 304 abuts against the trigger end of the limit switch 403. The connection holes 404 on the outer side of the door frame 401 facilitate the secure connection of the door frame 401 to the mounting holes 2 of the belt conveyor body 1 with bolts, preventing the door frame 401 from loosening. The limit switch 403 on the connecting frame 402 cooperates with the stop bar 304 of the door panel 301. When the door panel 301 is closed, the stop bar 304 triggers the limit switch 403. The limit switch 403 is connected to the existing belt misalignment switch circuit, which can control the power supply of the coal conveyor belt. When maintenance is required, or when the door panel 301 is not closed in place, the limit switch 403 is not triggered, the belt conveyor is de-energized and cannot run, forming a safety interlock.

[0024] Specifically, the working principle of this type of safety manhole door for coal conveyor belts is as follows: In use, the door frame 401 is first fixed to the mounting hole 2 of the outer frame of the conveyor body 1 using bolts through the connecting hole 404 on the outside of the door frame 401. When it is necessary to enter the conveyor for maintenance, the rotating wheel 303 on the bottom side of the control box 302 is rotated, causing the worm gear 313 inside the control box 302 to rotate. The worm gear 313 meshes with the worm wheel 312, driving the worm wheel 312 to rotate. The worm wheel 312 drives the gear 309 inside the adjusting box 306 to rotate through the central shaft. The gear 309 meshes with the racks 311 mirrored on both sides, causing a pair of moving blocks 310 to move synchronously towards each other, driving the insert rod 308 to retract along the sliding sleeve 307 and disengage from the slot 405 of the door frame 401. Then, rotating the door plate 301 around the hinge opens the manhole door for inspection. After repair, close the door panel 301 and rotate the wheel 303 in the opposite direction. Through the aforementioned transmission structure, the insertion rod 308 extends and inserts into the slot 405, fixing the door panel 301. At this time, the sealing strip 305 on the inner side of the door panel 301 fits against the outer side of the door frame 401, preventing coal dust leakage. Simultaneously, the stop rod 304 at one end of the door panel 301 triggers the limit switch 403. The limit switch 403 is connected to the belt misalignment switch circuit, allowing the coal conveyor belt to start. If the door panel 301 is not closed in place, the stop rod 304 cannot trigger the limit switch 403, and the belt cannot start, forming a safety interlock. The whole system realizes convenient opening and closing, stable sealing and safety protection of the manhole door, ensuring the safety of coal conveying operations. It also enables the automatic stopping of the belt when the manhole door is opened during belt operation, preventing safety accidents caused by personnel misoperation or maintenance.

[0025] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A coal belt conveyor safety manhole door, characterized in that, The belt conveyor body (1), the enclosure assembly (3), and the mounting mechanism (4) are provided. The outer frame of the belt conveyor body (1) is provided with mounting holes (2). The mounting mechanism (4) includes a door frame (401), which is inserted into the mounting hole (2). The top and bottom of the inner side of the door frame (401) are fixedly installed with slots (405). The enclosure component (3) includes a door panel (301). One end of the door panel (301) near the door frame (401) is hinged to the door frame (401) via a pair of hinges. An adjustment box (306) is fixedly connected to the inner wall of the door panel (301). Two symmetrically arranged moving blocks (310) are slidably connected to the inner wall of the adjustment box (306). A plug rod (308) is fixedly connected to the opposite ends of the two moving blocks (310). A sliding sleeve (307) is slidably connected to the outer wall of the plug rod (308). The bottom end of the sliding sleeve (307) is fixedly connected to the door panel (301). The opposite ends of the pair of plug rods (308) are respectively inserted into the slot (405).

2. A safety manhole door for a coal belt conveyor as claimed in claim 1, characterized in that: Each pair of moving blocks (310) has a rack (311) fixedly installed on its opposite ends, and the racks (311) are mirror images of each other.

3. A safety manhole door for a coal belt conveyor as claimed in claim 1, characterized in that: A control box (302) is fixedly installed on the outside of the door panel (301). A worm gear (312) is rotatably connected inside the control box (302). The central axis of the worm gear (312) passes through the door panel (301) and is rotatably connected to the door panel (301).

4. A safety manhole door for a coal belt conveyor as claimed in claim 3, characterised in that: The worm gear (312) has a gear (309) fixedly connected to one end of its central shaft inside the door panel (301), and the gear (309) meshes with the rack (311).

5. A safety manhole door for a coal belt conveyor as claimed in claim 4, characterised in that: A worm gear (313) is rotatably connected to one side of the bottom of the control box (302). The worm gear (313) passes through the control box (302) and meshes with the worm wheel (312). A rotating wheel (303) is fixedly connected to the end of the worm gear (313) away from the control box (302).

6. A safety manhole door for a coal conveyor belt according to claim 1, characterized in that: A sealing strip (305) is embedded in the outer edge of the inner side of the door panel (301), and one side of the sealing strip (305) abuts against the outer side of the door frame (401).

7. A safety manhole door for a coal belt conveyor as claimed in claim 1, characterized in that: The door frame (401) has several connecting holes (404) on its outer side. A connecting bracket (402) is fixedly connected to one side of the door frame (401). A limit switch (403) is fixedly connected to the inner side of the connecting bracket (402). A stop bar (304) is fixedly connected to the outer end of the door panel (301). One side of the stop bar (304) abuts against the trigger end of the limit switch (403).

Images