An air duct system for a drum screening apparatus

Abstract

The utility model relates to building waste screening technical field, and disclose a kind of air duct system of drum screening equipment, including support structure, working tank, set up on support structure, and the cavity is opened in working tank and front and rear form the through opening of intercommunication;Screening structure, set up in cavity, screening structure has two ports, and two ports respectively extend to outside and form screening passage by being perforated through passageway;Conveying structure, the input end of conveying structure is towards one of ports, and the output end of conveying structure is towards another port;Reverse jet structure, set up in working tank, and form a screening surface on screening structure;The utility model can guide dust generated in the process of material screening, prevent dust in screening drum from polluting working environment, prevent the health of operator from being threatened, meanwhile, can carry out strong reverse jet cleaning to the impurities blocked on screening drum, to more effectively remove blocked impurities, ensure that screening operation is stably carried out.

Description

Technical Field

[0001] This utility model relates to the field of construction waste screening technology, specifically to an air duct system for a drum screening device. Background Technology

[0002] With the continuous acceleration of urbanization, the amount of construction waste generated is increasing year by year, mainly including demolished brick walls, tiles, concrete, and other brick-concrete structure waste. In order to effectively extract the residual value of these construction wastes, they usually need to be crushed and sorted first to make them into aggregates for the production of recycled bricks, blocks, and wall materials. In this process, the screening stage is particularly critical, as it directly affects the quality of the recycled aggregates and their subsequent utilization value.

[0003] Currently, drum screens are commonly used to screen the waste materials after crushing. This is a device that uses the rotation of a drum to classify and screen materials. Its structure mainly includes a drum assembly, frame, sealing cover, feed inlet, and discharge outlet. During operation, the material enters the rotating drum through the feed inlet, continuously tumbling and advancing within the drum. Particles smaller than the screen aperture size pass through the screen and fall, achieving separation; while larger particles continue to advance until they are discharged from the discharge end.

[0004] However, during the sorting process, a lot of dust often occurs. This dust not only pollutes the working environment and threatens the health of operators, but also affects the normal operation of the equipment. In addition, the rollers may become clogged after prolonged use.

[0005] To address these issues, we designed a dedicated air duct system for drum screening equipment. Utility Model Content

[0006] This utility model provides an air duct system for a drum screening equipment. By using a reverse air jet structure, an air outlet structure, and a screening structure in combination, it can guide the dust generated during the material screening process, prevent the dust inside the screening drum from polluting the working environment, and prevent it from threatening the health of the operators. At the same time, it can powerfully back-spray to clean the impurities clogging the screening drum, so as to more effectively remove the clogging impurities and ensure the stable operation of the screening.

[0007] This utility model provides the following technical solution: A duct system for a drum screening device includes a support structure and further comprises: a working box disposed on the support structure, the working box having a cavity and interconnected openings at the front and rear; a screening structure disposed within the cavity, wherein the screening structure has two ports, each extending through the openings to the outside to form a screening channel; a conveying structure, the input end of the conveying structure facing one of the ports and the output end of the conveying structure facing the other port; a back-jet structure disposed within the working box, wherein the screening structure forms a screening surface and the output end of the back-jet structure faces the screening surface; an air outlet structure having two air outlets, one of which is connected to the back-jet structure and the other air outlet facing one of the ports of the screening structure; and a negative pressure structure disposed at the location of the screening channel for adsorbing gas within the screening channel.

[0008] As a preferred technical solution of this utility model, the screening structure includes a screening cylinder rotatably connected to the working box, wherein a bearing surface is formed on the supporting structure, a drive motor is provided on the bearing surface, a rotating wheel is provided at the output end of the drive motor, the rotating wheel abuts against the outer wall of the screening cylinder, the screening surface is formed on the outer surface of the screening cylinder, and the output end of the anti-air jet structure faces the screening cylinder.

[0009] As a preferred technical solution of this utility model, the anti-jet structure includes a jet box fixedly connected to the top of the working box, wherein the bottom of the jet box is provided with a jet hole facing the outer surface of the screening cylinder, and the jet box is connected to the air outlet structure through a conveying pipe.

[0010] As a preferred technical solution of this utility model, the air outlet structure includes an air outlet box, which is connected to the conveying pipe. The air outlet box is provided with an air inlet pipe and an air outlet pipe, and the air outlet pipe faces the inlet of the screening cylinder.

[0011] As a preferred embodiment of the present invention, the negative pressure structure includes a negative pressure box disposed on the screening channel, and a negative pressure pipe is disposed on the negative pressure box.

[0012] As a preferred embodiment of the present invention, the conveying structure includes a feed hopper located at the inlet of the screening channel, a conveyor belt located inside the screening channel, and the conveyor belt extending to the outside of the outlet of the screening channel.

[0013] As a preferred embodiment of this utility model, the support structure includes a support plate, which is fixedly connected to the bottom of the work box, and the bottom of the support plate is fixedly connected to a support leg.

[0014] Compared with the prior art, this utility model provides an air duct system for a drum screening device, which has the following beneficial effects: 1. In the air duct system of this drum screening equipment, the gas sprayed through the air outlet pipe forms a stable airflow field in the screening channel. This airflow field can guide the dust generated during the material screening process, prevent the dust in the screening drum from polluting the working environment, and prevent it from posing a threat to the health of the operators. 2. In the air duct system of this drum screening equipment, the air jet box can powerfully back-spray and clean the impurities clogging the screening drum, so as to more effectively remove the clogging impurities and ensure the stable operation of the screening.

[0015] The parts of this device not described herein are the same as or can be implemented using existing technologies. This utility model can guide the dust generated during the material screening process, prevent the dust in the screening cylinder from polluting the working environment, and prevent it from threatening the health of the operators. At the same time, it can powerfully back-spray clean the impurities clogging the screening cylinder to more effectively remove the clogging impurities and ensure the stable operation of the screening. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0017] Figure 1 This is a schematic diagram from a first-person perspective of the present invention; Figure 2 This is a schematic diagram of the present invention from a second perspective; Figure 3 This is a cross-sectional schematic diagram of the present invention; Figure 4 This is a schematic diagram of the jet box of this utility model.

[0018] In the diagram: 100, Support structure; 101, Support plate; 102, Support leg; 200, Working box; 300, Screening structure; 301, Screening cylinder; 302, Drive motor; 303, Rotary wheel; 400, Conveying structure; 401, Feed hopper; 402, Conveyor belt; 500, Anti-air jet structure; 501, Air jet box; 502, Air jet hole; 503, Conveying pipe; 600, Air outlet structure; 601, Air outlet box; 602, Air outlet pipe; 603, Air inlet pipe; 700, Negative pressure structure; 701, Negative pressure box; 702, Negative pressure pipe. Detailed Implementation

[0019] 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.

[0020] This utility model provides an air duct system for a drum screening device. Its basic components mainly include a support plate 101, also known as a support structure 100, which is fixedly connected to the bottom of a working box 200. Support legs 102 are fixedly connected to the bottom of the support plate 101. A rotatable screening cylinder 301, also known as a screening structure 300, is mounted on the working box 200. Both ends of the screening cylinder 301 extend to the outside of the working box 200, forming screening channels. A bearing surface is formed on the support plate 101, and a drive motor 302 is mounted on this surface. A rotating wheel 303 is mounted at the output end of the drive motor 302, abutting against the outer wall of the screening cylinder 301. The screening surface is formed on the outer surface of the screening cylinder 301. The drive motor 302 drives the rotary wheel 303 to rotate, which in turn drives the screening cylinder 301 to perform rotary screening operations in the working box 200. A conveying structure 400 is provided on one side of the working box 200. The feed hopper 401 of the conveying structure 400 is located above the outside of the working box 200 and is used to put the material to be screened. The conveyor belt 402 transports the material into the screening cylinder 301.

[0021] Specifically, the air outlet structure 600 includes an air outlet box 601, which is connected to the conveying pipe 503. The air outlet box 601 is equipped with an air inlet pipe 603 and an air outlet pipe 602. The air inlet pipe 603 is connected to an external air source, such as a fan or flow pump, to introduce external air. The air outlet pipe 602 guides the treated air to the required location. The air outlet box 601 is also equipped with a filter device, which can effectively filter impurities and dust in the introduced air to ensure the cleanliness of the air entering the screening cylinder 301, thereby improving the screening effect. At the same time, the air outlet pipe 602 faces the inlet of the screening cylinder 301, and there are two sets of air outlet pipes 602 installed on both sides of the feed hopper 401. A regulating valve is also installed on the air outlet pipe 602, which can control the air volume of the air outlet pipe 602 to adapt to the needs of different screening operations.

[0022] When gas is ejected from the exhaust duct 602, it can work in conjunction with the rotating screening cylinder 301 to screen the crushed brick walls, tiles, concrete and other brick-concrete structure waste. The gas ejected from the exhaust duct 602 forms a stable airflow field, which can guide the dust generated during the material screening process, and then collect and adsorb it by the negative pressure box 701, preventing the dust in the screening cylinder 301 from polluting the working environment and preventing it from posing a threat to the health of the operators.

[0023] A conveyor belt 402 is installed inside the screening channel, extending to the outside of the screening channel outlet. The surface of the conveyor belt 402 is designed with anti-slip features to effectively prevent material slippage during conveying, ensuring stable and continuous material transport to the designated position outside the screening channel outlet. Simultaneously, the drive mechanism of the conveyor belt 402 is installed outside the working box 200, facilitating routine maintenance and repair by personnel. In case of drive mechanism failure, repairs or replacements can be performed quickly, reducing equipment downtime and improving screening efficiency. Furthermore, the width of the conveyor belt 402 can be customized according to the actual amount of material being screened and the overall size of the working box 200 to better meet the needs of different screening scenarios. The material screened by the screening cylinder 301, i.e., the material at the bottom, will be conveyed to the outside by the conveyor belt 402. At the same time, another conveyor belt 402 (not shown in the figure) is also set at the opening of the screening cylinder 301 to guide the material that cannot be screened inside the screening cylinder 301. This conveyor belt 402 will smoothly and continuously transport larger pieces of material or impurities that cannot pass through the screening cylinder 301 to the designated collection area outside the equipment. This conveyor belt 402 also adopts an anti-slip design to prevent large pieces of material from slipping during the conveying process, ensuring the stability and reliability of the conveying process. In addition, the transmission device of this conveyor belt 402 is also installed outside the working box 200. This design not only facilitates the daily maintenance and repair of the staff, but also allows for rapid repair or replacement of parts when the transmission device fails, thereby minimizing equipment downtime and further improving the overall efficiency of the screening operation.

[0024] To facilitate the cleaning of any clogging impurities that may be present on the screening cylinder 301, a reverse air jet structure 500 is also provided on the working box 200. The air jet box 501 of the reverse air jet structure 500 is installed at the top of the working box 200 and close to the screening cylinder 301. The air jet box 501 has multiple sets of air jet holes 502, which can be twenty or thirty sets. The air jet box 501 is connected to the air outlet box 601 on the air outlet structure 600 through the conveying pipe 503. The bottom of the air outlet box 601 is arc-shaped, which can be adapted to the screening cylinder 301. It can impact and clean the clogging impurities on the screening cylinder 301, thereby ensuring the normal operation of the screening cylinder 301.

[0025] Furthermore, a regulating valve is installed on the conveying pipe 503, and the air flow rate in the conveying pipe 503 must be greater than the air flow rate in the outlet pipe 602. This arrangement ensures that the air jet box 501 has sufficient airflow intensity to powerfully back-spray and clean the impurities blocked on the screening cylinder 301 during rotation. In other words, when the screening cylinder 301 rotates, it can back-spray the screen holes on the screening cylinder 301, and the sprayed gas will also enter the screening channel, and finally be collected and adsorbed by the negative pressure box 701.

[0026] The regulating valve can flexibly adjust the air flow rate in the conveying pipe 503 according to the actual blockage situation and the specific requirements of the screening operation. When the screening cylinder 301 is severely blocked, the opening of the regulating valve can be appropriately increased to allow more airflow to enter the air jet box 501 through the conveying pipe 503 and be ejected from the air jet hole 502 to more effectively remove blockage impurities. When the blockage in the screening cylinder 301 is minor or during normal screening operation, the opening of the regulating valve can be appropriately reduced to avoid excessive consumption of air source and ensure stable screening operation.

[0027] A negative pressure box 701, also known as a negative pressure structure 700, is installed at the outlet of the screening channel. A negative pressure pipe 702 is installed on the negative pressure box 701. One end of the negative pressure pipe 702 is connected to the negative pressure box 701, and the other end is connected to a negative pressure generating device, such as a bag-type dust collection device. This typically refers to a dust collection device with a bag structure, the core component of which is a cloth bag or paper filter bag for collecting dust and debris. During operation, air carrying pollutants is sucked into the device, filtered through the filter bag, and clean air is discharged, while dust and other impurities are trapped inside the bag, thus achieving the cleaning purpose. The negative pressure pipe 702 creates a negative pressure environment inside the negative pressure box 701. In this way, during the screening process, the fine particles screened from the screening cylinder 301 are sucked into the negative pressure box 701 by the airflow in the screening channel under the action of negative pressure, and then collected and processed through the negative pressure pipe 702. This prevents these fine particles and dust from escaping into the surrounding environment, preventing threats to the health of operators and ensuring the normal operation of the equipment.

[0028] Components not described in detail in this article are existing technologies.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A duct system for a drum screening device, comprising a support structure (100), characterized in that, Also includes: The work box (200) is set on the support structure (100). The work box (200) has a cavity and a through-hole that is connected to the front and back. The screening structure (300) is located inside the cavity. The screening structure (300) has two ports, which extend through the opening to the outside to form a screening channel. The conveying structure (400) has its input end facing one of the ports and its output end facing the other port. The anti-jet structure (500) is located inside the work box (200). Among them, a screening surface is formed on the screening structure (300), and the output end of the anti-jet structure (500) faces the screening surface; The air outlet structure (600) has two air outlets, one of which is connected to the anti-jet structure (500), and the other air outlet faces one of the ports of the screening structure (300). The negative pressure structure (700) is located at the screening channel and is used to adsorb the gas in the screening channel.

2. The air duct system of a drum screening device according to claim 1, characterized in that, The screening structure (300) includes a screening cylinder (301) rotatably connected to the working box (200). The support structure (100) has a bearing surface, on which a drive motor (302) is provided. The output end of the drive motor (302) is provided with a rotating wheel (303). The rotating wheel (303) abuts against the outer wall of the screening cylinder (301). The screening surface is formed on the outer surface of the screening cylinder (301). The output end of the anti-jet structure (500) faces the screening cylinder (301).

3. The air duct system of a drum screening device according to claim 2, characterized in that, The anti-jet structure (500) includes a jet box (501) fixedly connected to the top of the work box (200). The bottom of the jet box (501) is provided with a jet hole (502), which faces the outer surface of the screening cylinder (301). The jet box (501) is connected to the air outlet structure (600) through a conveying pipe (503).

4. The air duct system of a drum screening device according to claim 3, characterized in that, The air outlet structure (600) includes an air outlet box (601), which is connected to the conveying pipe (503). The air outlet box (601) is provided with an air inlet pipe (603) and an air outlet pipe (602), which faces the inlet of the screening cylinder (301).

5. The air duct system of a drum screening device according to claim 1, characterized in that, The negative pressure structure (700) includes a negative pressure box (701) disposed on the screening channel, and a negative pressure pipe (702) is disposed on the negative pressure box (701).

6. The air duct system of a drum screening device according to claim 1, characterized in that, The conveying structure (400) includes a feed hopper (401) located at the inlet of the screening channel, and a conveyor belt (402) is provided inside the screening channel, extending to the outside of the screening channel outlet.

7. The air duct system of a drum screening device according to claim 1, characterized in that, The support structure (100) includes a support plate (101), which is fixedly connected to the bottom of the work box (200), and a support leg (102) is fixedly connected to the bottom of the support plate (101).

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