A screening device for recycled coarse aggregate in dry-mixed mortar

Abstract

This utility model relates to a screening device for recycled coarse aggregate in dry-mixed mortar, comprising a first frame with a screening tank on it, a vibrating motor below the screening tank, a buffer mechanism between the screening tank and the first frame, and a second frame outside the first frame. A magnetic separation device is mounted on the second frame, comprising a first slide rail, a second slide rail, a first limiting baffle, a first slide table, a second slide table, a threaded screw, a limiting slide rod, a sliding sleeve, an electromagnet, and a multi-stage electric push rod. It enables the electromagnet to complete one magnetic separation stroke at a preset speed and quickly transfers the electromagnet to a preset area after one magnetic separation stroke. This utility model is easy to use and has broad market prospects.

Description

Technical Field

[0001] This utility model relates to the field of screening equipment for recycled coarse aggregate in dry-mixed mortar, and specifically to a screening device for recycled coarse aggregate in dry-mixed mortar. Background Technology

[0002] With the acceleration of urbanization, the booming construction industry has also generated a large amount of construction waste. How to effectively treat and utilize this construction waste has become a crucial issue in urban management and environmental protection. As a recyclable resource, the research on the processing technology of recycled aggregate from construction waste is of great significance for promoting the resource utilization of construction waste and achieving sustainable development. Resource utilization, which transforms construction waste into reusable aggregate, can not only effectively reduce the amount of waste but also conserve natural resources and reduce environmental damage. An efficient recycled aggregate production process is a prerequisite for the recycling of waste concrete. The recycled aggregate production process includes manual or mechanical sorting, primary screening, primary crushing, magnetic separation for iron removal, secondary screening, secondary crushing, washing, screening, and air separation. Based on the characteristics of recycled aggregate, separating the waste cement mortar adhering to the waste concrete blocks and removing fine powders such as soil mixed in the recycled aggregate are two effective measures to improve the quality of recycled aggregate.

[0003] Iron components in the coarse aggregate formed from crushed construction waste must be removed. Otherwise, the iron impurities in the coarse aggregate will affect its quality. When using magnetic separation for iron removal, the electromagnet needs to move slowly and uniformly at a preset speed over the material being screened to ensure the screening rate and prevent iron impurities from remaining due to excessively fast movement. After completing one magnetic separation cycle, the electromagnet needs to be quickly moved to a preset area and the current supply to it disconnected, allowing the iron impurities adsorbed on the electromagnet to move to the preset area. Therefore, there is room for improvement in the existing technology to enable the electromagnet to complete one magnetic separation cycle on the material being screened at a preset speed and to quickly move the electromagnet to the preset area after the cycle, thereby improving the efficiency of magnetic separation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a screening device for dry-mixed mortar recycled coarse aggregate that enables an electromagnet to complete one magnetic separation stroke at a preset speed and to quickly transfer the electromagnet to a preset area after the magnetic separation stroke is completed, thereby overcoming the defects in existing technologies.

[0005] The technical solution adopted by this utility model is as follows: a screening device for recycled coarse aggregate in dry-mixed mortar, including a first frame, a screening trough is provided on the first frame, a vibrating motor is provided below the screening trough, a buffer mechanism is provided between the screening trough and the first frame, a second frame is provided on the outside of the first frame, and a magnetic separation device is provided on the second frame. The magnetic separation device includes a first slide rail provided on the second frame above the screening trough, a second slide rail provided on the second frame parallel to the first slide rail on one side of the first slide rail, a first limiting baffle provided at the end of the first and second slide rails away from the screening trough, a first slide table and a second slide table provided on the first and second slide rails, a threaded screw and a limiting slide rod provided on the first and second slide tables, a sliding sleeve provided on the limiting slide rod and the threaded screw, an electromagnet provided on the side of the sliding sleeve close to the screening trough, and a multi-stage electric push rod provided on the first slide table and the first limiting baffle.

[0006] Preferably, both the first slide and the second slide adopt a block structure that can slide along the extension direction of the first slide rail and the extension direction of the second slide rail. The number of multi-stage electric actuators is two, and the two multi-stage electric actuators are installed on both sides of the first slide. The first slide is located between the second slide and the first limiting baffle.

[0007] Preferably, a feed pipe is provided at one end of the screening tank, a storage tank is provided on the second frame on one side of the screening tank, a discharge pipe is provided at the bottom of the storage tank, a butterfly valve is provided on the discharge pipe, and the number of magnetic separation devices is several, and the several magnetic separation devices are distributed at intervals above the screening tank along the direction from near the feed pipe to away from the feed pipe.

[0008] Preferably, exhaust branch pipes are provided between two adjacent magnetic separation devices and between the feed pipe and the adjacent magnetic separation device, and exhaust main pipes are provided on several exhaust branch pipes, with dust collectors connected to the exhaust main pipes.

[0009] Preferably, the number of exhaust branch pipes between two adjacent magnetic separation devices and the number of exhaust branch pipes between the feed pipe and the adjacent magnetic separation device are both several.

[0010] Preferably, the feed pipe includes a first conveying section, a buffer section, and a second conveying section from top to bottom. The cross-section of the inner cavity of the first conveying section and the inner cavity of the second conveying section are both rectangular, while the cross-section of the inner cavity of the buffer section is trapezoidal. The buffer section is provided with several guide plates, and the inner cavity of the buffer section is evenly divided into several material conveying chambers by the several guide plates.

[0011] The beneficial effects of this utility model are as follows: This utility model utilizes the threaded screw and limiting slide rod set on the first slide and the second slide, combined with the sliding sleeve set on the limiting slide rod and the threaded screw, to realize that the servo motor drives the limiting slide rod to rotate, thereby driving the sliding sleeve to move at a preset speed under the limitation of the limiting slide rod. Thus, the electromagnet on the sliding sleeve completes the magnetic separation of the recycled aggregate below during the movement. After one magnetic separation stroke is completed, the multi-stage electric push rod drives the first slide and the second slide and the electromagnet to move to the storage tank to complete the transfer of the adsorbed iron-containing impurities, thereby improving work efficiency.

[0012] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a structural schematic diagram of the component of this utility model. Detailed Implementation

[0015] like Figure 1 and Figure 2As shown, a screening device for recycled coarse aggregate in dry-mixed mortar includes a first frame 1. A screening trough 2 is mounted on the first frame 1, and a vibrating motor 3 is mounted below the screening trough 2. A protrusion is provided at the bottom of the screening trough 2, and the vibrating motor 3 is mounted on the protrusion. The angles between the central axis of the vibrating motor 3 and the horizontal plane are 38 degrees and 52 degrees, respectively. The angles between the bottom surface of the screening trough 2 and the horizontal plane are 3 degrees and 5 degrees, respectively. A buffer mechanism is provided between the screening trough 2 and the first frame 1. The buffer mechanism includes wing plates 24 on both sides of the screening trough 2 and several rubber disc springs 4 respectively installed between each wing plate 24 and the first frame 1. The function of installing the rubber disc springs 4 is to provide buffering and reduce noise. A second frame 5 is provided on the outer side of the first frame 1. A magnetic separation device is provided on the second frame 5. The magnetic separation device includes a first slide rail 6 provided on the second frame 5 above the screening tank 2, a second slide rail 7 provided on the second frame 5 parallel to the first slide rail 6 on one side of the first slide rail 6, a first limiting baffle 8 provided at the end of the first slide rail 6 and the second slide rail 7 away from the screening tank 2, a second limiting baffle provided at the end of the first slide rail 6 and the second slide rail 7 away from the screening tank 2, a first slide table 9 and a second slide table 10 provided on the first slide rail 6 and the second slide rail 7, a threaded screw 11 and a limiting slide rod 12 provided on the first slide table 9 and the second slide table 10, a sliding sleeve 13 provided on the limiting slide rod 12 and the threaded screw 11, an electromagnet 14 provided on the side of the sliding sleeve 13 near the screening tank 2, a servo motor provided on the threaded screw 11, and a multi-stage electric push rod 15 provided on the first slide table 9 and the first limiting baffle 8. Both the first slide table 9 and the second slide table 10 are block structures capable of sliding along the extension directions of the first slide rail 6 and the second slide rail 7. Two multi-stage electric actuators 15 are used, installed on both sides of the first slide table 9, which is located between the second slide table 10 and the first limiting baffle 8. The central axis of the first slide rail 6 is perpendicular to the central axis of the screening tank 2. The threaded screw 11 and the limiting slide rod 12 are parallel.

[0016] Each sliding sleeve 13 is threadedly connected to the adjacent threaded screw 11, and each sliding sleeve 13 is movably connected to the adjacent limiting slide rod 12. A feed pipe 16 is provided on one end of the screening tank 2. The height of the bottom surface of the screening tank 2 gradually decreases along the direction from near to far from the feed pipe 16. A discharge port is provided on the end of the screening tank 2 away from the feed pipe 16. A storage tank 17 is provided on the second frame 5 on one side of the screening tank 2. The bottom of the storage tank 17 adopts a bucket-shaped structure. The outer diameter of the bottom of the inner cavity of the storage tank 17 gradually decreases as the height of the storage tank 17 decreases, thereby facilitating the guidance of the material entering the storage tank 17. A discharge pipe 18 is provided on the bottom of the storage tank 17. A butterfly valve 19 is provided on the discharge pipe 18. Several magnetic separation devices are used. Several magnetic separation devices are distributed sequentially and spaced above the screening tank 2 along the direction from near to far from the feed pipe 16. Each pair of adjacent magnetic separation devices and between the feed pipe 16 and a nearby magnetic separation device is provided with an exhaust branch pipe 20. A main exhaust pipe 21 is connected to each of the exhaust branch pipes 20, and a dust collector 22 is connected to the main exhaust pipe 21. The number of exhaust branch pipes 20 between adjacent magnetic separation devices and between the feed pipe 16 and a nearby magnetic separation device is several.

[0017] The feed pipe 16, from top to bottom, includes a first conveying section, a buffer section, and a second conveying section. The cross-sections of the inner cavities of the first and second conveying sections are both rectangular, while the cross-section of the inner cavity of the buffer section is trapezoidal. The buffer section contains several guide plates 23, which evenly divide the inner cavity of the buffer section into several material conveying chambers. These material conveying chambers guide the incoming material, ensuring that the material enters the inner cavity of the screening tank 2 evenly.

[0018] The instructions for using this product are as follows: Figure 1 and Figure 2As shown, firstly, the dust collector 22 is connected to the induced draft fan, and the vibration motor 3 and the servo motor are turned on. Then, the recycled aggregate that has completed the initial crushing is conveyed to the feed pipe 16. After being guided by several material conveying chambers, the recycled aggregate is conveyed to the screening tank 2 and slowly moves towards the discharge port under the vibration provided by the vibration motor 3. During this process, the dust generated by the vibration and the powdery material mixed in the recycled aggregate are carried into the airflow of several exhaust branch pipes 20 and then conveyed to the dust collector 22 through the exhaust main pipe 21. As the recycled aggregate continues to move towards the discharge port, the thickness of the recycled aggregate gradually becomes thinner. Each servo motor drives the adjacent threaded screw 11 to rotate, thereby driving the sliding sleeve 13 to move from the first slide 9 to the second slide 10 or from the second slide 10 to the first slide 9 at the limit slide rod 12.

[0019] When the sliding sleeve 13 completes its journey from the first sliding table 9 to the second sliding table 10 or from the second sliding table 10 to the first sliding table 9, it is considered to have completed one magnetic separation journey. At this time, the corresponding multi-stage electric push rod 15 drives the first sliding table 9 to move toward the first limiting baffle 8. The first sliding table 9 drives the second sliding table 10 to move synchronously with the first sliding table 9 through the limiting slide rod 12. When the multi-stage electric push rod 15 moves to the top of the inner cavity of the storage tank 17, the corresponding electromagnet 14 is turned off. At this time, the iron-containing impurities fall into the inner cavity of the storage tank 17 because they lose the magnetic force provided by the corresponding electromagnet 14.

[0020] Finally, under the repeated magnetic separation provided by several magnetic separation devices, the iron-containing impurities in the recycled aggregate are separated from the recycled aggregate during the process of moving from the feed pipe 16 to the discharge port. At the same time, due to vibration, some fine powder material is separated from the recycled aggregate.

[0021] In this embodiment, by utilizing the threaded screw 11 and the limiting slide rod 12 provided on the first slide table 9 and the second slide table 10, combined with the sliding sleeve 13 provided on the limiting slide rod 12 and the threaded screw 11, the servo motor drives the limiting slide rod 12 to rotate, thereby driving the sliding sleeve 13 to move at a preset speed under the limitation of the limiting slide rod 12. Thus, the electromagnet 14 on the sliding sleeve 13 completes the magnetic separation of the recycled aggregate below during the movement. After one magnetic separation stroke is completed, the multi-stage electric push rod 15 drives the first slide table 9, the second slide table 10, and the electromagnet 14 to move to the storage tank 17 to complete the transfer of the adsorbed iron-containing impurities, thereby improving work efficiency.

[0022] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A screening device for dry-mix mortar recycled coarse aggregates, characterized in that it comprises: The system includes a first frame (1), on which a screening tank (2) is provided, and a vibration motor (3) is provided below the screening tank (2). A buffer mechanism is provided between the screening tank (2) and the first frame (1). A second frame (5) is provided on the outside of the first frame (1). A magnetic separation device is provided on the second frame (5). The magnetic separation device includes a first slide rail (6) provided on the second frame (5) above the screening tank (2), a second slide rail (7) provided on the second frame (5) on one side of the first slide rail (6) and parallel to the first slide rail (6), and a first slide rail (7) provided on the second frame (5). A first limiting baffle (8) is provided at the end of the rail (6) and the second slide rail (7) away from the screening tank (2), a first slide table (9) and a second slide table (10) are provided on the first slide rail (6) and the second slide rail (7), a threaded screw (11) and a limiting slide rod (12) are provided on the first slide table (9) and the second slide table (10), a sliding sleeve (13) is provided on the limiting slide rod (12) and the threaded screw (11), an electromagnet (14) is provided on the side of the sliding sleeve (13) close to the screening tank (2), and a multi-stage electric push rod (15) is provided on the first slide table (9) and the first limiting baffle (8).

2. The screening device for recycled coarse aggregate in dry-mixed mortar according to claim 1, characterized in that: The first slide (9) and the second slide (10) are both block structures that can slide along the extension direction of the first slide rail (6) and the extension direction of the second slide rail (7). There are two multi-stage electric actuators (15). The two multi-stage electric actuators (15) are installed on both sides of the first slide (9). The first slide (9) is located between the second slide (10) and the first limiting baffle (8).

3. The screening device for recycled coarse aggregate in dry-mixed mortar according to claim 1, characterized in that: A feed pipe (16) is provided at one end of the screening tank (2), a storage tank (17) is provided on the second frame (5) on one side of the screening tank (2), a discharge pipe (18) is provided at the bottom of the storage tank (17), and a butterfly valve (19) is provided on the discharge pipe (18). The number of magnetic separation devices is several, and the several magnetic separation devices are distributed sequentially at intervals above the screening tank (2) along the direction from near the feed pipe (16) to away from the feed pipe (16).

4. The screening device for recycled coarse aggregate in dry-mixed mortar according to claim 1, characterized in that: A ventilation branch pipe (20) is provided between two adjacent magnetic separation devices and between the feed pipe (16) and the adjacent magnetic separation device. A ventilation main pipe (21) is provided on several ventilation branch pipes (20), and a dust collector (22) is connected to the ventilation main pipe (21).

5. The screening device for recycled coarse aggregate in dry-mixed mortar according to claim 1, characterized in that: The number of exhaust branch pipes (20) between two adjacent magnetic separation devices and the number of exhaust branch pipes (20) between the feed pipe (16) and the adjacent magnetic separation device are both several.

6. The screening device for recycled coarse aggregate in dry-mixed mortar according to claim 1, characterized in that: The feed pipe (16) includes a first conveying section, a buffer section and a second conveying section from top to bottom. The cross-section of the inner cavity of the first conveying section and the inner cavity of the second conveying section are both rectangular. The cross-section of the inner cavity of the buffer section is trapezoidal. The buffer section is provided with several guide plates (23). The inner cavity of the buffer section is evenly divided into several material conveying cavities by several guide plates (23).

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