Coal bunker telescopic stack

Abstract

The utility model relates to coal bunker ventilation equipment technical field, concretely is a kind of coal bunker telescopic air duct, including air duct body, still include the positioning ring of multiple equidistance sleeve set in the periphery of air duct body, annular groove one is set in the top surface of positioning ring, the bottom surface of positioning ring is provided with the annular protrusion one of cooperation insertion with annular groove one, multiple lifting eyes are equidistance fixed in the both sides of air duct body, and the bottom end of two steel wires is fixed with the lifting eye of bottommost by passing multiple lifting eyes. In the utility model, by controlling steel wire rope to drive air duct body to retract, so that the best ventilation distance can be kept all the time, when coal level is high, air duct body is lifted, avoids that dust is lifted in large quantities, when coal level is low, air duct body is promptly lowered, ensures that air flow effectively covers coal body surface, promotes gas diffusion;By the cooperation setting between air duct body, positioning ring, butt joint ring and limiting assembly, the circumferential rotation in air duct body retraction process is effectively limited, ensure that it only moves along axial direction.

Description

Technical Field

[0001] This utility model relates to the technical field of coal bunker ventilation equipment, specifically a retractable ventilation duct for coal bunkers. Background Technology

[0002] In coal mine production, ventilation safety in underground coal bunkers is of paramount importance. To prevent the accumulation of methane in underground coal bunkers, traditional local ventilation fans are usually installed at the top of the coal bunker to ventilate the coal bunker. However, after the installation of traditional local ventilation fans, their end positions are fixed and cannot adapt to the dynamic changes in the coal level in the coal bunker. When the coal level rises, if the distance between the ventilation duct and the coal level is too small, the airflow will stir up a large amount of dust, which will not only hinder the personnel from observing the coal level, but also cause the dust concentration in the working environment to exceed the standard, threatening the health of employees. On the other hand, when the coal level falls, if the distance between the ventilation duct and the coal level is too large, the airflow cannot effectively cover the surface of the coal body, making it difficult for gas to diffuse and posing a safety hazard. Therefore, realizing that the ventilation duct can expand and contract with the coal level and maintain a reasonable ventilation distance has become the key to ensuring the safe and efficient operation of coal bunker ventilation. Utility Model Content

[0003] The purpose of this utility model is to provide a retractable ventilation duct for coal bunkers to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A retractable ventilation duct for coal bunkers includes a duct body and further includes: Multiple positioning rings are equidistantly fitted around the outer periphery of the air duct body. The top surface of the positioning ring is provided with an annular groove, and the bottom surface of the positioning ring is provided with an annular protrusion that engages with the annular groove. Multiple lifting rings are fixed at equal intervals on both sides of the air duct body; Two steel wire ropes, the bottom ends of which pass through multiple lifting rings and are fixed to the bottommost lifting ring.

[0005] Furthermore, multiple docking rings are equidistantly arranged between the two positioning rings, and each docking ring is symmetrically equipped with a lifting ring.

[0006] Furthermore, the top surface of the mating ring is provided with an annular groove 2, and the bottom surface of the mating ring is provided with an annular protrusion 2 that mates with and inserts into the annular groove 2. The size of the annular groove 2 is the same as the size of the annular groove 1, and the size of the annular protrusion 2 is the same as the size of the annular protrusion 1.

[0007] Furthermore, the outer wall of the docking ring is provided with multiple insertion holes 2 through at equal angles, and the outer wall of the positioning ring is provided with multiple insertion holes 1 through at equal angles. The lifting ring is inserted and engaged with insertion holes 1 and insertion holes 2.

[0008] Furthermore, the outer wall of the positioning ring is provided with a snap-fit ​​groove, and a limit component is installed on the snap-fit ​​groove.

[0009] Furthermore, the limiting component includes an inverted block that engages with the snap-fit ​​groove. A base is fixedly connected to the outer wall of the inverted block, and a slide rod is fixedly connected to the top surface of the base. A limiting block is fixedly connected to the top of the slide rod, and a connecting block is provided between two adjacent slide rods. Both ends of the connecting block are provided with round holes, and the two round holes are respectively slidably engaged with the two corresponding slide rods.

[0010] Furthermore, both the shaped block and the snap-fit ​​groove are provided with threaded holes, and the shaped block can be detachably fixed to the snap-fit ​​groove by bolts.

[0011] Compared with the prior art, the beneficial effects of this utility model are: By controlling the steel wire rope to extend and retract the ventilation duct body, the optimal ventilation distance can always be maintained. When the coal level is high, the ventilation duct body is raised to prevent a large amount of dust from being stirred up. When the coal level is low, the ventilation duct body is lowered in time to ensure that the airflow effectively covers the coal surface and promotes gas diffusion.

[0012] The coordinated arrangement of the duct body, positioning ring, docking ring, and limiting components effectively restricts the circumferential rotation of the duct body during its retraction and extension, ensuring that it moves only along the axial direction. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the wind tunnel body, positioning ring, docking ring, and limiting component in this utility model; Figure 3 This is a schematic diagram of the positioning ring and docking ring structure in this utility model; Figure 4 This is a schematic diagram of the limiting component structure in this utility model.

[0014] In the diagram: 100, air duct body; 200, positioning ring; 210, annular groove one; 220, annular protrusion one; 230, insertion hole one; 240, snap-fit ​​groove; 300, docking ring; 310, annular groove two; 320, annular protrusion two; 330, insertion hole two; 400, lifting ring; 500, limiting component; 510, C-shaped block; 520, base; 530, sliding rod; 540, limiting block; 550, connecting block; 551, round hole; 600, steel wire rope. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-4 In this embodiment of the utility model, a retractable ventilation duct for a coal bunker includes a duct body 100, positioning rings 200, lifting rings 400, and a steel wire rope 600. The duct body 100 is made of rigid material, which has good rigidity and strength, and can maintain the unobstructed ventilation channel during extension and retraction, ensuring stable airflow. Simultaneously, the smooth surface of the rigid duct reduces wind resistance, thus improving ventilation efficiency. Multiple positioning rings 200 are provided, equidistantly sleeved around the duct body 100. The top surface of each positioning ring 200 has an annular groove 210, and the bottom surface of each positioning ring 200 has a groove corresponding to the annular groove 210. The groove 210 is fitted with the annular protrusion 220. Multiple lifting rings 400 are symmetrically and evenly spaced on both sides of the ventilation duct body 100. Each wire rope 600 passes vertically through all the lifting rings 400 on the same side. The bottom end of the wire rope 600 is fixed to the lowest lifting ring 400, while the top extends upwards and connects to a drive device installed on the coal bunker roof or a stable support. By winding and unwinding the wire rope 600, the entire ventilation duct body 100 can be smoothly extended and retracted. The drive device uses the mechanical principle of a winch anti-runaway device to control the winding and unwinding of the wire rope 600. It is also equipped with an ultrasonic radar level gauge and a PLC. The programmable control box and ultrasonic radar level gauge are used to convert the measured coal surface distance data into electrical signals. The PLC programmable control box effectively connects various units such as the anti-runaway device, ultrasonic radar level gauge, and ventilation duct body 100 by writing specific logic programs. The PLC control box automatically analyzes and judges the received coal level data and issues instructions to control the anti-runaway device to extend and retract the steel wire rope 600, so that the ventilation duct body 100 can automatically extend and retract with the coal level, ensuring that the ventilation distance is always in a suitable position.

[0017] Specifically, the anti-runaway device is installed on a stable support near the top of the coal bunker to ensure safe and stable traction of the 600 mm steel wire rope. An ultrasonic radar level gauge is installed at a suitable position on the top of the coal bunker to non-contactly measure the distance from the surface of the coal pile to the top of the bunker (i.e., coal level height) in real time, and transmits this analog or digital signal to the PLC control box in real time. The control box is installed in the electrical control cabinet near the coal bunker for easy wiring and maintenance. The PLC receives real-time coal level signals from the ultrasonic level gauge, calculates the target height that the air outlet of the ventilation duct body 100 needs to reach through its internal program, and compares it with the current height of the ventilation duct body 100. Then, the PLC sends control commands (forward / reverse / stop) to the anti-runaway device to precisely retract the steel wire rope 600, driving the ventilation duct body 100 to extend and retract until the preset optimal safe distance from the coal surface is reached. The ventilation duct body 100 can be divided into multiple sections, and positioning rings 200 are fitted at the bottom of each section of the ventilation duct body 100. After the steel wire rope 600 drives the bottom section of the ventilation duct body 100 to move upward, the positioning ring 200 at the bottom will approach the positioning ring 200 above it until the annular protrusion 220 inserts into the corresponding annular groove 210, thereby locking the lower section of the retracting ventilation duct body 100, while the upper section continues to retract, reducing the pipe bending caused by the retraction and stacking of the lower end of the traditional ventilation duct body 100. Example 1

[0018] like Figure 3 As shown, in this embodiment, multiple docking rings 300 are equidistantly arranged between the two positioning rings 200. Each docking ring 300 is symmetrically equipped with a lifting ring 400. The top surface of the docking ring 300 is provided with an annular groove 310, and the bottom surface of the docking ring 300 is provided with an annular protrusion 320 that mates with the annular groove 310. The size of the annular groove 310 is the same as the size of the annular groove 210, and the size of the annular protrusion 320 is the same as the size of the annular protrusion 220.

[0019] In this embodiment, the docking ring 300 is sleeved around the outer periphery of the duct body 100 and located between the upper and lower positioning rings 200, so that the duct body 100, the positioning rings 200 and the docking ring 300 together form a multi-stage telescopic cylindrical structure, which improves the overall telescopic stroke and stability.

[0020] like Figure 2-3 As shown, in this embodiment, the outer wall of the docking ring 300 is provided with multiple insertion holes 330 at equal angles, and the outer wall of the positioning ring 200 is provided with multiple insertion holes 230 at equal angles. The lifting ring 400 is inserted and engaged with the insertion holes 230 and the insertion holes 330.

[0021] In practice, the mounting end of the lifting ring 400 can be designed as a pin or bolt structure, which is inserted into the corresponding insertion hole 230 or insertion hole 330 to achieve fixation, thereby evenly transmitting the hanging force to the entire telescopic structure. Example 2

[0022] Based on Embodiment 1, in order to further prevent the duct body 100 from rotating circumferentially or swaying laterally during the extension and retraction process, and to improve the straightness and stability of the operation.

[0023] like Figure 2-4 As shown, in this embodiment, the outer wall of the positioning ring 200 is provided with a snap-fit ​​groove 240, and a limiting component 500 is installed on the snap-fit ​​groove 240. The limiting component 500 includes an inverted block 510 that snaps into the snap-fit ​​groove 240. A base 520 is fixedly connected to the outer wall of the inverted block 510, and a slide rod 530 is fixedly connected to the top surface of the base 520. A limiting block 540 is fixedly connected to the top end of the slide rod 530. A connecting block 550 is provided between two adjacent slide rods 530. Both ends of the connecting block 550 are provided with round holes 551, and the two round holes 551 are respectively slidably sleeved with the two corresponding slide rods 530. Threaded holes are provided on both the inverted block 510 and the snap-fit ​​groove 240. The inverted block 510 is detachably fixed to the snap-fit ​​groove 240 by bolts.

[0024] In practice, when the duct body 100 needs to extend or retract, the drive device pulls the duct body 100 upward or downward via the wire rope 600. Since the connecting block 550 is fitted onto the slide rod 530 through the round hole 551, and the slide rod 530 is fixed to the corresponding positioning ring 200 via the U-shaped block 510, when the positioning ring 200 rises and falls with the duct body 100, the slide rod 530 also rises and falls synchronously. The two adjacent slide rods 530 are connected by the connecting block 550, and multiple limiting components 500 are connected together to form an external frame, which effectively restricts the circumferential rotation of the duct body 100. Therefore, when the duct body 100 retracts, it can only move up and down along the axial direction, which improves the stability of the duct body 100 operation.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A retractable ventilation duct for a coal bunker, comprising a duct body (100), characterized in that, Also includes: Multiple positioning rings (200) are equidistantly sleeved around the outer periphery of the air duct body (100). The top surface of the positioning ring (200) is provided with an annular groove (210), and the bottom surface of the positioning ring (200) is provided with an annular protrusion (220) that engages with the annular groove (210). Multiple lifting rings (400) are fixed at equal intervals on both sides of the air duct body (100); Two steel wire ropes (600) have their bottom ends passing through multiple lifting rings (400) and fixed to the bottommost lifting ring (400).

2. The retractable ventilation duct for coal bunkers according to claim 1, characterized in that, Multiple docking rings (300) are equidistantly arranged between the two positioning rings (200), and each docking ring (300) is symmetrically equipped with a lifting ring (400).

3. The retractable ventilation duct for coal bunkers according to claim 2, characterized in that, The top surface of the docking ring (300) is provided with an annular groove 2 (310), and the bottom surface of the docking ring (300) is provided with an annular protrusion 2 (320) that is engaged with the annular groove 2 (310). The size of the annular groove 2 (310) is the same as that of the annular groove 1 (210), and the size of the annular protrusion 2 (320) is the same as that of the annular protrusion 1 (220).

4. The retractable ventilation duct for coal bunkers according to claim 2, characterized in that, The outer wall of the docking ring (300) is provided with multiple insertion holes 2 (330) through at equal angles, and the outer wall of the positioning ring (200) is provided with multiple insertion holes 1 (230) through at equal angles. The lifting ring (400) is inserted into and cooperates with insertion holes 1 (230) and insertion holes 2 (330).

5. The retractable ventilation duct for a coal bunker according to claim 1, characterized in that, The outer wall of the positioning ring (200) is provided with a snap-fit ​​groove (240), and a limit component (500) is installed on the snap-fit ​​groove (240).

6. The retractable ventilation duct for a coal bunker according to claim 5, characterized in that, The limiting component (500) includes an inverted block (510) that engages with the snap-fit ​​groove (240). A base (520) is fixedly connected to the outer wall of the inverted block (510). A slide rod (530) is fixedly connected to the top surface of the base (520). A limiting block (540) is fixedly connected to the top of the slide rod (530). A connecting block (550) is provided between two adjacent slide rods (530). Both ends of the connecting block (550) are provided with round holes (551). The two round holes (551) are respectively slidably engaged with the two corresponding slide rods (530).

7. The retractable ventilation duct for a coal bunker according to claim 6, characterized in that, Both the shaped block (510) and the snap-fit ​​groove (240) are provided with threaded holes, and the shaped block (510) is detachably fixed to the snap-fit ​​groove (240) by bolts.

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