A multi-stage concrete aggregate screening device

Abstract

This invention discloses a multi-stage concrete aggregate screening device, including a housing and a screening cylinder. A drive assembly is circumferentially arranged on the outer walls of the front and rear ends of the screening cylinder, allowing the screening cylinder to rotate within the housing cavity via the drive assembly. Multiple gear chambers are respectively positioned on the left and right sides of the front and rear ends of the housing, and are electrically connected to the housing cavity. Each gear chamber contains a transmission gear that is connected to the drive assembly. A cleaning chamber is also included, electrically connected and of equal length, on both sides of the housing. Each cleaning chamber contains a cleaning mechanism, which includes multiple fan plates circumferentially arranged around a drive shaft. Brush heads are located at the outer ends of the fan plates and are close to the screening cylinder. A feeding chamber has an opening at its upper end, with one side of the feeding chamber electrically connected to one end of the housing. An outlet is located at the other end of the housing. A conveying auger is horizontally positioned along the central axis of the screening cylinder, extending from one end of the feeding chamber to the outlet end.

Description

Technical Field

[0001] This invention relates to the field of screening equipment technology, specifically a multi-stage concrete sand and gravel screening device. Background Technology

[0002] In the process of using concrete, concrete aggregates of different sizes need to be applied to different construction fields. For example, coarse sand is often used in the pouring of large buildings. The larger size of the aggregate can fill the pouring more quickly and strengthen the structural rigidity of large buildings. Medium sand is often used in road construction. It can avoid the unevenness caused by coarse sand paving and also avoid the defects of long road construction cycle and structural instability caused by excessive dilution of fine sand. Fine sand is usually used as a concrete coating on the exterior surface of residential building walls. Therefore, concrete aggregates of different sizes need to be clearly distinguished and applied to different construction fields.

[0003] When screening concrete aggregate, screening devices are needed to separate the irregular concrete aggregate by size. However, since concrete aggregate is usually irregular in structure, it is very easy to get clogged in the mesh of the screening device during the screening process, which reduces the efficiency of the screening device. Workers need to clean it regularly to ensure that the screening function is unobstructed.

[0004] Chinese Patent Application No. "202420027478.2" discloses a vibrating screening device for mining stone, including a machine body and a screening mechanism. The screening mechanism is installed inside the machine body and includes shafts, rollers, a main screen cylinder, a motor, and gears. Shafts are obliquely installed at the four corners inside the machine body, and rollers are installed at both ends of the shafts. The motor drives the shafts and rollers to rotate through the gears, which in turn drives the main screen cylinder to rotate. This ensures that the main screen cylinder keeps rotating during the screening process, and stones stuck inside the screen holes move into the machine body. While stones are thrown out and fall from the top position, in reality, during the sand and gravel screening process, the stones stuck in the screen holes are usually some stones that are pressed down at the bottom by the pile of stones to be screened. When they are tightly stuck in the mesh due to the pressure caused by the pile of stones, they are not naturally thrown off without external pressure as proposed in the aforementioned patent, which only requires rotating the main screen cylinder to rotate the mesh hole where the stones are stuck to the top. Therefore, the technical means proposed in the aforementioned patent cannot completely solve the problem of cleaning stones with different degrees of sticking, and there are still significant technical defects and room for improvement. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a multi-stage screening device for concrete aggregates to solve the technical problem mentioned in the background art of aggregates getting stuck in the screen holes and being difficult to clean.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A multi-stage concrete sand and gravel screening device includes a housing and a screening cylinder. A drive assembly is circumferentially arranged on the outer wall of the front and rear ends of the screening cylinder. The screening cylinder is rotated and disposed in the cavity of the housing by the drive assembly.

[0008] Gear compartments, multiple gear compartments are respectively set on the left and right sides of the front and rear ports of the housing, the gear compartments are electrically connected to the housing cavity, and the gear compartments contain transmission gears that are connected to the drive assembly.

[0009] The cleaning chambers are connected and equally long on both sides of the machine casing. The cleaning chambers contain a cleaning mechanism, which includes multiple fan plates arranged around the drive shaft. Brush heads are provided at the outer ends of the fan plates, and the brush head ends of the fan plates are attached to and close to the sieve cylinder.

[0010] The feeding hopper has an opening at the top. One side of the feeding hopper is connected to one end of the machine casing. The other end of the machine casing is provided with a discharge port. A conveying auger is erected horizontally at the central axis of the screening cylinder from one end of the outer side of the feeding hopper to one end of the discharge port. One end of the conveying auger is coaxially connected to a first motor.

[0011] Multiple discharge chambers are evenly distributed at the lower end of the machine casing.

[0012] Furthermore, the inner walls of both the front and rear ends of the housing are provided with concave first grooves, and the drive components at the front and rear ends of the sieve cylinder are respectively embedded in the first grooves. The bottom plates of the cleaning chambers on both sides of the housing are inclined downwards, and the side of the inclined end of the cleaning chamber is provided with an opening.

[0013] Furthermore, the drive assembly includes a second sliding groove formed on the outer wall of the front and rear openings of the screening cylinder, the second sliding groove being configured in accordance with the first sliding groove, and multiple rollers being evenly distributed around the second sliding groove, with limit retainers provided between the multiple rollers.

[0014] Furthermore, the limiting retainer is an annular structure with multiple limiting holes evenly distributed on its outer surface, and the roller is fitted into the limiting holes. The limiting retainer and the roller are arranged between the first slide groove and the second slide groove.

[0015] Furthermore, the drive assembly also includes a gear rail circumferentially disposed on the outer wall of both ends of the screening cylinder, the gear rail meshing with the transmission gear in the gear compartment.

[0016] Furthermore, the outer circumference of the drive shaft has multiple bearing seats that are continuously arranged along the length of the drive shaft. The bearing seats are hollow inside and open at the top. A positioning shaft is provided inside the bearing seat and is mounted between the left and right ends of the bearing seat. The fan plate is installed through the positioning shaft. A second motor is coaxially connected to one end of the drive shaft.

[0017] Furthermore, the bottom of the fan plate has a positioning hole, and the fan plate is swung and mounted on the positioning shaft through the bottom positioning hole. An installation groove is opened on the outer side of the fan plate, and multiple pin holes are arranged horizontally on the front and rear surfaces of the installation groove. The brush head is embedded in the installation groove.

[0018] Furthermore, the brush head is the same length as the fan plate, and a clip of the same length as the mounting groove is provided on one side of the brush head. The brush head is embedded in the mounting groove by the clip, and the clip and the mounting groove are fixedly connected by a pin in the pin hole.

[0019] Furthermore, the screening cylinder is a multi-segment screen cylinder structure, with each segment having a progressively larger mesh size from the end near the feed hopper to the end near the discharge port. Each segment of the screening cylinder is located in a discharge hopper at the lower end of the machine casing.

[0020] Furthermore, a third motor is coaxially connected to one side of one of the transmission gears, and a transmission belt is sleeved between the transmission gear on the same side as the transmission gear connected to the third motor.

[0021] The beneficial effects of this invention are as follows: This invention, by installing a rotatable screening cylinder inside the casing, drives the screening cylinder to rotate via transmission gears located in gear compartments on both sides of the casing and drive components at its front and rear ends. Simultaneously, a conveying auger extending from the feed hopper to the other end of the casing rotates in the opposite direction. After the sand and gravel enter the screening cylinder, the rotating screening cylinder and the rotating conveying auger not only ensure the gradual pushing of the sand and gravel from inlet to outlet, preventing accumulation within the screening cylinder, but also keep the sand and gravel constantly dispersed by the relative rotation of the screening cylinder and the conveying auger, reducing... This reduces the probability of sand and gravel being pressed into the screen holes due to excessive accumulation. During the rotation of the screening cylinder, cleaning components with brush heads are installed in the cleaning chambers on both sides of the machine casing. The rotation of the cleaning components brings the brush heads closer to the screening cylinder, and the two rotate relative to each other. The brush heads apply pressure to the surface of the screening cylinder as they pass, further knocking off the sand and gravel stuck in the screen holes and preventing the mesh from clogging. Finally, the fan plate installed on the outside of the drive shaft can blow the dust generated by the sand and gravel being screened in the screening cylinder into the cleaning chamber during rotation, avoiding the impact of dust accumulation in the machine casing chamber on the service life. Attached image description:

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle;

[0024] Figure 3 This is a top view of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the casing of the present invention;

[0026] Figure 5 This is a schematic diagram of one end of the housing structure of the present invention;

[0027] Figure 6 This is a schematic diagram of one end of the sieving cylinder of the present invention;

[0028] Figure 7 This is a schematic diagram of the drive component structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the cleaning component structure of the present invention;

[0030] Figure 9 for Figure 8 A schematic diagram of the partial structure of A in the middle.

[0031] The diagram shows the following labels: 1. Machine casing; 101. Discharge port; 102. Discharge bin; 103. Cleaning bin; 104. Gear bin; 105. First chute; 2. Feed bin; 3. Screening cylinder; 301. Second chute; 302. Limit retainer; 303. Roller; 304. Gear rail; 4. Conveying auger; 401. First motor; 5. Drive shaft; 501. Shaft seat; 502. Positioning shaft; 503. Second motor; 6. Fan plate; 601. Mounting slot; 602. Pin hole; 603. Positioning hole; 7. Brush head; 701. Clip; 8. Transmission gear; 801. Third motor; 802. Transmission belt. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0035] Example 1:

[0036] like Figures 1 to 4 The multi-stage concrete aggregate screening device shown includes a housing 1, which serves as the support structure for the entire device and houses other components. It also includes a screening cylinder 3, with drive components circumferentially arranged on the outer walls of its front and rear ends. The screening cylinder 3 is mounted within the housing 1 via these drive components. The drive components at both ends of the screening cylinder 3 ensure stable and rotatable mounting within the housing 1. At least four gear compartments 104 are also provided, corresponding to the left and right sides of the front and rear ends of the housing 1, with at least one gear compartment 104 on each side. The gear compartments 104 are electrically connected to the housing 1 cavity. Each gear compartment 104 contains a transmission gear 8, which is rotatably mounted within the gear compartment 1. Figure 4As shown, the transmission gears 8 mesh with the drive assembly for transmission. The four transmission gears 8 respectively support the four bottom corners on the left and right sides of the lower end of the screening cylinder 3, thereby enabling more stable transmission and maintaining operational stability. Furthermore, a cleaning chamber 103 is also provided. The cleaning chambers 103 are respectively connected and equally long on both sides of the casing 1. The bottom plates of the cleaning chambers 103 on both sides of the casing 1 are inclined downwards. An opening is provided on the side of the inclined end of the cleaning chamber 103. The cleaning chamber 103 contains a cleaning mechanism, which includes multiple fan plates 6 arranged around the transmission shaft 5. The fan plates are centered on the transmission shaft 5 and arranged around the outside of the transmission shaft 5. A brush head 7 is provided on the outer end of the fan plate 6. The brush head 7 end of the fan plate 6 is attached close to the screening cylinder 3. During the operation of the screening cylinder 3, the brush head 7 is attached to and abuts against the outer surface of the screening cylinder 3, thereby applying pressure to the surface of the screening cylinder 3. This causes the brush head 7 to brush off the stones stuck in the screen holes and re-enter the screening cylinder 3 for screening, thus solving the problem of screen hole blockage. Furthermore, a feeding bin 2 is also provided. The feeding bin 2 is open at the top and serves as the feed inlet during the stone screening process. The stones to be screened enter the feeding bin 2 through this inlet. One side of the feeding bin 2 is conductively connected to one end of the machine casing 1, and the other end of the machine casing 1 is provided with a discharge port 101. A conveying auger 4 is horizontally positioned along the central axis inside the screening cylinder 3, extending from one end of the feed hopper 2 to the other end of the discharge port 101. One end of the conveying auger 4 is coaxially connected to a first motor 401. Driven by the first motor 401, the sand and gravel entering the feed hopper 2 from the upper feed inlet is gradually moved from the feed inlet to the discharge port 101 by the conveying auger 4. During this movement, the sand and gravel are rotated by the conveying auger 4, making them more loose and preventing them from accumulating. Furthermore, the movement of the sand and gravel promoted by the conveying auger 4 is more efficient than the movement promoted by the vibrating structure. To further reduce equipment wear and noise during sand and gravel transportation, during the material feeding process of the conveying auger 4, the material passing through the screening cylinder 3 is screened step by step according to different sizes. Multiple discharge bins 102 are evenly distributed at the lower end of the casing 1. The screening cylinder 3 is a multi-segment screen cylinder structure. The multiple screen cylinders are multi-segment structures with the mesh size gradually increasing from small to large from one end near the feed bin 2 to the discharge port 101. Each segment of the screening cylinder 3 is equipped with a discharge bin 102 located at the lower end of the casing 1. The lower end of the discharge bin 102 is open to discharge sand and gravel with different particle sizes for separate accumulation.

[0037] As a further technical solution in this embodiment, such as Figure 5 As shown, the inner walls of both the front and rear ends of the casing 1 are circumferentially formed with recessed first sliding grooves 105. The drive components at both ends of the screening cylinder 3 are respectively embedded in the first sliding grooves 105. The first sliding grooves 105 are used to support and install the protrusions of the drive components at both ends of the screening cylinder 3, such as... Figure 6 and Figure 7 As shown, the drive assembly includes a second sliding groove 301 formed on the outer wall of the front and rear openings of the screening cylinder 3. The second sliding groove 301 corresponds to the first sliding groove 105. Multiple rollers 303 are evenly distributed around the circumference of the second sliding groove 301. The rollers 303 reduce the friction between the screening cylinder 3 and the housing 1, ensuring smooth rotation of the screening cylinder 3 within the housing, reducing wear between the housing 1 and the screening cylinder 3, and increasing service life. A limit retainer 302 is provided between the multiple rollers 303. The limit retainer 302 is an annular structure with multiple limit holes evenly distributed on its outer surface. The limiting device 302 is embedded in the limiting hole. The limiting device 302 and the roller 303 are located between the first slide groove 105 and the second slide groove 301. The limiting device 302 prevents the roller 303 from changing its position during the operation of the screening cylinder 3, and always maintains the position of the roller 303. This ensures uniform force during the rotation of the screening cylinder 3 and provides limiting protection for the screening cylinder 3. At the same time, the screening cylinder 3 is the same length as the machine casing 1. During the screening process, the longer multi-section screening cylinder can give the sand and gravel sufficient time to be stirred and fall, ensuring that materials of different particle sizes fall to their corresponding falling areas.

[0038] As a further technical solution in this embodiment, such as Figure 4 As shown, the drive assembly also includes a gear rail 304 circumferentially disposed on the outer wall of both ends of the screening cylinder 3. The gear rail 304 meshes with the transmission gear 8 in the gear compartment 104. This is the mode by which the transmission gear 8 drives the screening cylinder 3. One of the transmission gears 8 is coaxially connected to a third motor 801 on one side. A transmission belt 802 is sleeved between the transmission gear 8 on the same side as the transmission gear 8 connected to the third motor 801. Through the drive of one of the transmission gears 8 by the third motor 801, during the movement of the secondary transmission gear 8, the transmission belt 802 is driven by the third motor 801. The transmission belt 802 on the other side drives the other transmission gear 8 on the same side to rotate, thereby driving the toothed rail 304 at one end of the screening cylinder 3 on both sides, making the drive more stable. The other two transmission gears 8 only serve as a support structure for the screening cylinder 3. The support at the four corners provides stability. When it is necessary to improve the rotational capacity of the screening cylinder 3, the other two transmission gears 8 can be installed in the same way by connecting them with the transmission belt 802 and driving them with the third motor 801, thereby improving the screening rotational capacity of the screening cylinder 3.

[0039] As a further technical solution in this embodiment, the outer circumference of the transmission shaft 5 is further provided with a plurality of bearing seats 501 continuously arranged along the length of the transmission shaft 5. The bearing seats 501 are hollow inside and open at the top. A positioning shaft 502 is provided inside the bearing seat 501 and is mounted between the left and right ends of the bearing seat 501. The fan plate 6 is mounted through the positioning shaft 502. The bottom of the fan plate 6 has a positioning hole 603. The fan plate 6 is swaying on the positioning shaft 502 through the bottom positioning hole 603. The fan plate 6 is a plate-shaped structure with the same length as the positioning shaft 502. Because the fan plate 6 can be swayed on the positioning shaft 502 through the positioning hole 603, when the other end of the fan plate 6... The brush head 7 contacts the outer surface of the screening cylinder 3. As the screening cylinder 3 rotates, it drives the fan plate 6 to swing upwards. This avoids the damage caused by direct relative friction between the fan plate 6 and the screening cylinder 3 during rotation, which could lead to breakage if the fan plate 6 were fixed. The swinging design reduces the buffering effect of relative movement with the screening cylinder 3. Since the fan plate is swing-mounted on the positioning shaft through positioning holes, when a fan plate 6 passes the screening cylinder 3, the end with the brush head loses the frictional force and contact with the screening cylinder, causing the fan plate 6 to fall naturally. The wind force generated during the fall of the fan plate 6 can... The dust generated inside the casing 1 is fanned into the cleaning chamber 103, preventing the accumulation of dust and fine particles in the equipment and thus affecting its service life. Simultaneously, a dust-absorbing sponge can be built into the cleaning chamber to absorb the dust entering the chamber, making it easier for staff to clean later. Simply remove the sponge for cleaning. A second motor 503 is coaxially connected to one end of the drive shaft 5. A mounting groove 601 is opened on the outer side of the fan plate 6. Multiple pin holes 602 are horizontally arranged on the front and rear surfaces of the mounting groove 601. A brush head 7 is embedded in the mounting groove 601. The brush head 7... The fan plate 6 is of equal length, and one side of the brush head 7 is provided with a clip 701 of the same length as the mounting groove 601. The brush head 7 is embedded in the mounting groove 601 through the clip 701. The clip 701 and the mounting groove 601 are fixedly connected by a pin in the pin hole 602, making disassembly more convenient. Since the brush head 7 is used to brush away sand and gravel in the screen holes, wear of the brush head 7 is inevitable. This installation method improves the convenience of replacing the brush head 7, saves manpower and resources. During the material screening process, it can also eliminate a large amount of dust generated in the process, greatly reducing the spread of dust to a certain extent, and playing the role of dust control, while realizing multiple functions.

[0040] Example 2:

[0041] When this equipment is in operation, sand and gravel are filled into the feed hopper 2 through the upper opening. With the conveying auger 4 running, the sand and gravel enter the screening cylinder 3 through the feed hopper 2. The rotatable screening cylinder 3 is driven by transmission gears 8 located in gear compartments 104 on both sides of the casing 1, which are connected to the drive components at its front and rear ends, causing it to rotate. Simultaneously, the conveying auger 4, extending from the feed hopper 2 to the other end of the casing 1, rotates in the opposite direction. After the sand and gravel enter the screening cylinder 3, the rotating screen cylinder and the rotating conveying auger 4 not only ensure the gradual pushing of the sand and gravel from inlet to outlet, preventing accumulation within the screening cylinder 3, but also allow the sand and gravel to pass through smoothly and efficiently. The stones are kept in a dispersed state at all times, reducing the probability of the lower sand and gravel being pressed into the screen holes due to the large accumulation of sand and gravel. During the rotation of the screening cylinder 3, the cleaning chambers 103 on both sides of the machine casing 1 are also equipped with cleaning components with brush heads 7 on the outside. The rotation of the cleaning components causes the brush heads 7 to come into close contact with the screening cylinder 3, and the two rotate relative to each other. The brush heads 7 apply pressure to the surface of the screening cylinder 3 as they pass through, further knocking off the sand and gravel stuck in the screen holes, thus preventing the mesh from clogging. Finally, the fan plate 6 set on the outside of the drive shaft 5 can blow the dust caused by the sand and gravel screened in the screening cylinder 3 into the cleaning chamber 103 by swinging during the rotation, thus avoiding the impact of dust accumulation in the machine casing 1 chamber on the service life.

[0042] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalents of the claims be included within the present invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

[0043] 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 multi-stage concrete grit screening device comprising a housing (1), characterised in that: It also includes a screening cylinder (3), on which a drive assembly is circumferentially arranged on the outer wall at both ends of the screening cylinder (3), and the screening cylinder (3) is rotatably disposed in the cavity of the housing (1) by the drive assembly; four gear compartments (104), which are arranged in pairs on the left and right sides of the front and rear ends of the housing (1), and the gear compartments (104) are electrically connected to the cavity of the housing (1), and the gear compartments (104) contain transmission gears (8) that are connected to the drive assembly; and two cleaning compartments (103). The cleaning chamber (103) is equipped with a cleaning mechanism, which includes multiple fan plates (6) arranged around the outside of the drive shaft (5) with the drive shaft (5) as the center. The outer end of the fan plate (6) is equipped with a brush head (7). The end of the fan plate (6) with the brush head (7) is attached to the sieve cylinder (3) and close to it. The feeding chamber (2) is open at the top. One side of the feeding chamber (2) is connected to one end of the machine casing (1). The other end of the machine casing (1) is equipped with a discharge port (101). A conveying auger (4) is installed horizontally on the central axis of the screening cylinder (3) from one end of the feed hopper (2) to one end of the discharge port (101). One end of the conveying auger (4) is coaxially connected to a first motor (401). Multiple discharge hoppers (102) are evenly distributed at the lower end of the casing (1). Multiple bearing seats (501) are continuously arranged along the length of the drive shaft (5) around the outer circumference of the drive shaft (5). The bearing seats (501) are hollow inside and open at one end away from the drive shaft. Inside the bearing seats (501) are provided a support mounted on the bearing seats (501). 01) The positioning shaft (502) between the left and right ends is used to install the fan plate (6). One end of the transmission shaft (5) is coaxially connected to the second motor (503). The bottom of the fan plate (6) has a positioning hole (603). The fan plate (6) is swung on the positioning shaft (502) through the bottom positioning hole (603). The outer side of the fan plate (6) has an installation groove (601). Multiple pin holes (602) are arranged horizontally on the front and rear plates of the installation groove (601). The brush head (7) is embedded in the installation groove (601).

2. The multi-stage concrete aggregate screening device according to claim 1, characterized in that: The inner walls of the front and rear ends of the housing (1) are all circumferentially enclosed by a first groove (105). The drive components at the front and rear ends of the sieve cylinder (3) are respectively embedded in the first groove (105). The bottom plates of the cleaning chambers (103) on both sides of the housing (1) are inclined downwards, and an opening is provided on the side of the inclined end of the cleaning chamber (103).

3. The multi-stage concrete aggregate screening device according to claim 2, characterized in that: The drive assembly includes a second slide groove (301) on the outer wall of the front and rear ends of the screening cylinder (3). The two second slide grooves (301) are set one-to-one with the first slide groove (105). Multiple rollers (303) are evenly distributed around the inner circumference of the second slide groove (301), and limit retainers (302) are set between the multiple rollers (303).

4. The multi-stage concrete aggregate screening device according to claim 3, characterized in that: The limiting retainer (302) is an annular structure with multiple limiting holes evenly distributed on its outer surface. The roller (303) is fitted into the limiting hole for limiting. The limiting retainer (302) and the roller (303) are located between the first slide groove (105) and the second slide groove (301).

5. The multi-stage concrete aggregate screening device according to claim 1, characterized in that: The drive assembly also includes a toothed rail (304) circumferentially disposed on the outer wall of both ends of the screening cylinder (3), and the toothed rail (304) meshes with the transmission gear (8) in the gear compartment (104).

6. The multi-stage concrete aggregate screening device according to claim 1, characterized in that: The brush head (7) is the same length as the fan plate (6), and a clip (701) of the same length as the mounting groove (601) is provided on one side of the brush head (7). The brush head (7) is embedded in the mounting groove (601) through the clip (701). The clip (701) and the mounting groove (601) are fixedly connected by a pin in the pin hole (602).

7. The multi-stage concrete aggregate screening device according to claim 1, characterized in that: The sieve cylinder (3) is a multi-segment sieve cylinder structure. The multi-segment sieve cylinders are multi-segment structures with the mesh size gradually increasing from the end near the feed hopper (2) to the end of the discharge port (101). The multi-segment sieve cylinders corresponding to the sieve cylinder (3) are arranged in a series of discharge hoppers (102) located at the lower end of the machine casing (1). The lower end of the discharge hopper (102) is open.

8. The multi-stage concrete aggregate screening device according to claim 1, characterized in that: One of the transmission gears (8) is coaxially connected to a third motor (801) on one side, and a transmission belt (802) is sleeved between the transmission gears (8) on the same side as the transmission gear (8) connected to the third motor (801).

Images