A sandstone rotary screening device

Abstract

This utility model relates to the field of sand and gravel mining technology, and more particularly to a rotary sand and gravel screening device, comprising: a washing section and a screening section; the washing section includes a water supply pipe; the water supply pipe extends into the washing section; the nozzle of the water supply pipe sprays towards the inner wall of the washing section; the screening section includes an assembly frame and screen plates; the assembly frame is connected to the washing section; the screen plates are arranged circumferentially along the assembly frame; the screen plates are rotatably connected to the assembly frame to adjust the gap between the screen plates; a fixing plate is provided at the end of the screen plate; a screw through hole is provided on the fixing plate; when the gap between the screen plates is adjusted, the screen plates are fixed to the assembly frame by the fixing plate. In the prior art, existing rotary screening devices can only screen sand and gravel of the same size, which is difficult to meet different gradation requirements. Compared with the prior art, this utility model can adjust the size of the screened sand and gravel by rotating the screen plates to adjust the gap between the screen plates, thereby meeting different gradation requirements.

Description

Technical Field

[0001] This utility model relates to the field of sand and gravel mining technology, and in particular to a sand and gravel rotary screening device. Background Technology

[0002] Sand and gravel are the most basic and widely used building materials in engineering construction, mainly formed from rocks through natural weathering or mechanical crushing. As the framework of concrete and asphalt, they play a crucial supporting role, and their quality directly affects the safety and durability of engineering projects. Whether it's houses, roads, bridges, or water conservancy facilities, sand and gravel are indispensable.

[0003] During actual mining, the size of the extracted sand and gravel may vary due to the influence of mining equipment. However, in practical applications, different projects (such as concrete and asphalt pavement) have strict "gradation" requirements for the size and particle size ratio of sand and gravel. Good gradation allows for close packing of particles, reducing voids, thus achieving higher strength and denser concrete with less cement paste. Therefore, after sand and gravel mining, screening is necessary. Typically, rotary screens are used to meet the screening and washing requirements of sand and gravel. As mentioned earlier, different projects have different gradation requirements. However, existing rotary screens can only screen sand and gravel of the same size, making it difficult to meet diverse gradation needs. Utility Model Content

[0004] In view of the technical problems of the prior art, this utility model provides a sand and gravel rotary screening device.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A rotary sand and gravel screening device includes: a rinsing section and a screening section; the rinsing section includes a water supply pipe; the water supply pipe extends into the rinsing section; the nozzle of the water supply pipe sprays towards the inner wall of the rinsing section; the screening section includes an assembly frame and screen plates; the assembly frame is connected to the rinsing section; the screen plates are arranged circumferentially along the assembly frame; the screen plates are rotatably connected to the assembly frame to adjust the gap between the screen plates; a fixing plate is provided at the end of the screen plate; a screw through hole is provided on the fixing plate; when the gap between the screen plates is adjusted, the screen plates are fixed to the assembly frame by the fixing plate.

[0007] Furthermore, the rinsing unit also includes a housing; the housing is connected to the screening unit; a cavity for carrying sand and gravel is provided on the housing; a water supply pipe extends into the housing; and the spray direction of the water supply pipe nozzle is towards the inner wall of the housing.

[0008] Furthermore, the rinsing section also includes a propulsion plate; the propulsion plate is disposed inside the housing; the propulsion plate is spiral-shaped; the propulsion plate extends from one end of the housing to the other end.

[0009] Furthermore, a sliding track is fixedly installed on the push plate; the sliding track is respectively installed on the upper and lower sides of the push plate; the cross section of the sliding track is T-shaped; the outer shell is provided with a sliding groove corresponding to the sliding track, so that the push plate can be slidably connected to the outer shell through the sliding track.

[0010] Furthermore, the assembly frame has an assembly opening; the sieve plate is embedded in the assembly opening; a rotating shaft is provided on the sieve plate; one end of the rotating shaft is fixedly connected to the sieve plate, and the other end extends into the side wall of the assembly opening; the rotating shaft is fixedly connected to the fixing plate.

[0011] Furthermore, the fixing plate is set inside the side wall of the assembly frame; the assembly frame has a screw receiving groove; the screw receiving groove passes through the assembly frame and is connected to the screw through hole.

[0012] Furthermore, the screw receiving groove is annular; the center of the screw receiving groove coincides with the center of the rotating shaft, so as to correspond to the movement trajectory of the screw through hole.

[0013] Furthermore, it also includes a power motor and a driven gear; the driven gear is sleeved on the rinsing section; the output end of the power motor is fixedly equipped with a drive gear; the drive gear meshes with the driven gear to drive the rinsing section and the screening section to rotate. Attached Figure Description

[0014] Figure 1 Overall structure diagram.

[0015] Figure 2 Overall structural diagram of the rinsing section.

[0016] Figure 3 Assembly frame assembly structure diagram.

[0017] Figure 4 : Enlarged view of the screw receiving slot.

[0018] In the diagram: 1. Rinsing section; 11. Outer shell; 12. Water supply pipe; 13. Propulsion plate; 131. Sliding track; 2. Screening section; 21. Assembly frame; 211. Screw receiving slot; 22. Screen plate; 221. Fixing plate; 222. Rotating shaft; 3. Power motor; 31. Drive gear; 4. Driven gear. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] A rotary sand and gravel screening device includes a rinsing section 1 and a screening section 2. The rinsing section 1 includes a water supply pipe 12 extending into the rinsing section 1. The nozzle of the water supply pipe 12 sprays water towards the inner wall of the rinsing section 1. The screening section 2 includes an assembly frame 21 and screen plates 22. The assembly frame 21 is connected to the rinsing section 1. The screen plates 22 are arranged circumferentially along the assembly frame 21. The screen plates 22 are rotatably connected to the assembly frame 21 to adjust the gap between them. A fixing plate 221 is provided at the end of each screen plate 22. Screw through holes are provided on the fixing plate 221. When the gap between the screen plates 22 is adjusted, the screen plates 22 are fixed to the assembly frame 21 via the fixing plate 221.

[0021] The water supply pipe 12 can be made of stainless steel or PVC, with 4-8 nozzles evenly distributed in a ring. The nozzle angle is adjustable from 30-60 degrees, and the water pressure is controlled between 0.3-0.6 MPa. The mounting frame 21 can be made of welded steel or cast aluminum alloy, with a diameter designed to be 1.5-3 meters depending on the processing capacity. The screen plate 22 is made of wear-resistant manganese steel with a thickness of 8-15 mm, and the fixing plate 221 has a thickness of 10-20 mm. The screw through-hole diameter is 8-12 mm, and stainless steel anti-loosening bolts are used. The rotating connection can be made of bearing connection or bushing structure, with a rotation angle adjustment range of 0-30 degrees.

[0022] This device, through the design of an adjustable-gap screen plate 22, solves the problem that existing rotary screening devices can only screen sand and gravel of a single specification. Specifically, the gap of the screen plate 22 can be flexibly adjusted according to gradation requirements, enabling simultaneous screening of sand and gravel of different particle sizes. The washing section 1 and the screening section 2 work together to complete the washing and grading of sand and gravel during rotation. The directional washing of the inner wall by the water supply pipe 12 effectively removes impurities from the surface of the sand and gravel, while the adjustable screen plate 22 structure ensures the controllability of screening accuracy. Compared with screening devices with fixed gaps, this solution significantly improves the applicability and working efficiency of the equipment, and can meet the diverse needs of different projects for sand and gravel gradation.

[0023] The rinsing unit 1 also includes a housing 11. The housing 11 is connected to the screening unit 2. A cavity for holding sand and gravel is provided on the housing 11. A water supply pipe 12 extends into the housing 11. The spray direction of the nozzle of the water supply pipe 12 is towards the inner wall of the housing 11.

[0024] The outer shell 11 can be welded from stainless steel or wear-resistant steel plate, and its inner wall can be lined with wear-resistant plates to extend its service life. The volume of the cavity can be designed to be 0.5-3 cubic meters depending on the processing capacity, and the inclination angle of the inner wall is preferably 15-30 degrees to facilitate material flow. The water supply pipe 12 is fixed to the top of the outer shell 11 by flange connection or threaded connection. The nozzle is a fan-shaped nozzle or a rotating nozzle, and the spray angle is adjusted to 30-45 degrees so that the water flow can cover the inner wall surface. The connection between the outer shell 11 and the screening section 2 can be a bolted flange connection, and a rubber sealing ring is set at the joint to prevent water leakage. In this way, the water supply pipe 12 continuously sprays water into the sand and gravel in the rinsing section 1, thereby rinsing the surface of the sand and gravel to remove impurities such as mud and plant roots from the surface of the sand and gravel to meet the requirements for the cleanliness of the sand and gravel surface.

[0025] The rinsing section 1 also includes a push plate 13. The push plate 13 is disposed inside the housing 11. The push plate 13 is spiral-shaped. The push plate 13 extends from one end of the housing 11 to the other end. Specifically, a sliding track 131 is fixedly disposed on the push plate 13. The sliding track 131 is respectively disposed on the upper and lower sides of the push plate 13. The cross-section of the sliding track 131 is T-shaped. The housing 11 has a groove corresponding to the sliding track 131, so that the push plate 13 can be slidably connected to the housing 11 through the sliding track 131.

[0026] The propulsion plate 13 is spiral-shaped; specifically, it can be designed as a single-spiral or double-spiral structure. As a preferred embodiment, the pitch of the spiral propulsion plate 13 can be adjusted according to the amount of sand and gravel to be processed, for example, using a fixed pitch of 30-50 cm or a variable pitch design. The propulsion plate 13 can be made of wear-resistant steel plate with a thickness of 8-12 mm, and its surface can be hardened to extend its service life. The gap between the propulsion plate 13 and the inner wall of the outer shell 11 is controlled at 5-10 mm, ensuring both propulsion effect and preventing material jamming. Simultaneously, the spiral propulsion plate 13 extends from one end of the outer shell 11 to the other, forming a continuous propulsion surface. When the device rotates, it generates axial propulsion force, causing the sand and gravel to move evenly along the inner wall of the outer shell 11. The spiral propulsion plate 13 achieves more uniform material distribution and a more stable propulsion speed, avoiding uneven rinsing caused by localized accumulation. Therefore, the residence time of sand and gravel in the rinsing section 1 is precisely controlled, ensuring consistent rinsing results.

[0027] On the other hand, the sliding rail 131 allows workers to easily remove the push plate 13 from the housing 11, facilitating subsequent maintenance of the push plate 13. Preferably, corresponding screw through holes are provided on the housing 11 to fix the sliding rail 131 to the housing 11 with screws, thereby preventing uncontrollable sliding of the push plate 13 during use.

[0028] The assembly frame 21 has an assembly opening. A sieve plate 22 is embedded within the assembly opening. A rotating shaft 222 is mounted on the sieve plate 22. One end of the rotating shaft 222 is fixedly connected to the sieve plate 22, and the other end extends into the side wall of the assembly opening. The rotating shaft 222 is fixedly connected to a fixing plate 221. Specifically, the fixing plate 221 is located within the side wall of the assembly frame 21. A screw receiving groove 211 is provided on the assembly frame 21. The screw receiving groove 211 penetrates the assembly frame 21 and communicates with a screw through-hole. Furthermore, the screw receiving groove 211 is annular. The center of the screw receiving groove 211 coincides with the center of the rotating shaft 222, corresponding to the movement trajectory of the screw through-hole.

[0029] In practice, the assembly frame 21 is a detachable C-shaped structure. A connecting plate is fixedly mounted on the assembly frame 21 for connection, and the assembly frame 21 is embedded into the main frame of the screening section 2 via the connecting plate. The main frame has corresponding screw holes for fixed connection to the assembly frame 21 via screws. Specifically, the connecting plate is horizontally positioned, allowing the operator to remove the assembly frame 21 by pulling it horizontally. After removal, the screw receiving groove 211 on one side of the assembly frame 21 is exposed. The operator can then remove the screws from the screw receiving groove 211, allowing the screen plates 22 to rotate around the rotating shaft 222, thereby adjusting the gap between the screen plates 22. After adjustment, the screws are reinserted into the screw receiving groove 211, connecting them to the fixing plate 221, thus securing the screen plates 22 again. The assembly frame 21 can then be reinstalled. At this time, the assembly frame 21 and the main frame will jointly shield the screws to prevent the sand and gravel from directly hitting the screws during the screening process, which could cause the screws to fall off or be damaged, thereby extending the service life of the screws.

[0030] It also includes a power motor 3 and a driven gear 4. The driven gear 4 is fitted onto the rinsing section 1. A drive gear 31 is fixedly installed at the output end of the power motor 3. The drive gear 31 meshes with the driven gear 4 to drive the rinsing section 1 and the screening section 2 to rotate.

[0031] Therefore, when the power motor 3 rotates, it drives the drive gear 31 to rotate, which in turn drives the rinsing section 1 and the screening section 2 to rotate synchronously via the driven gear 4. Preferably, a corresponding support structure is provided, and rollers are provided on the support structure. One support structure is attached to the outer shell 11, and the other support structure is attached to the main frame, so that the entire support device can rotate normally.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A rotary screening device for sand and gravel, characterized in that: include: Rinsing section, screening section; The flushing section includes a water supply pipe; The water supply pipe extends into the flushing section; The nozzle of the water supply pipe sprays water towards the inner wall of the rinsing section; The screening unit includes an assembly frame and a sieve plate; The assembly frame is connected to the rinsing section; The sieve plates are arranged circumferentially along the assembly frame; The sieve plate is rotatably connected to the assembly frame to adjust the gap between the sieve plates; A fixing plate is provided at the end of the sieve plate; The fixing plate is provided with screw through holes; Once the gap between the sieve plates is adjusted, the sieve plates are fixed to the assembly frame via the fixing plate.

2. The sand and gravel rotary screening device according to claim 1, characterized in that: The rinsing unit also includes a housing; The outer shell is connected to the screening section; The outer shell has a cavity for carrying the sand and gravel; The water supply pipe extends into the outer casing; The water supply pipe nozzle sprays water towards the inner wall of the outer casing.

3. The sand and gravel rotary screening device according to claim 2, characterized in that: The flushing section also includes a propulsion plate; The propulsion plate is disposed inside the outer casing; The propulsion plate is spiral-shaped; The propulsion plate extends from one end of the outer shell to the other end.

4. The sand and gravel rotary screening device according to claim 3, characterized in that: A sliding track is fixedly installed on the propulsion plate; The sliding tracks are respectively arranged on the upper and lower sides of the propulsion plate; The cross-section of the sliding track is T-shaped; The outer casing has a groove corresponding to the sliding track, so that the push plate can be slidably connected to the outer casing via the sliding track.

5. The sand and gravel rotary screening device according to claim 1, characterized in that: The assembly frame has an assembly opening; The sieve plate is embedded in the assembly port; The sieve plate is provided with a rotating shaft; One end of the rotating shaft is fixedly connected to the sieve plate, and the other end extends into the side wall of the assembly port; The rotating shaft is fixedly connected to the fixed plate.

6. The sand and gravel rotary screening device according to claim 5, characterized in that: The fixing plate is disposed inside the side wall of the assembly frame; The assembly frame is provided with screw receiving slots; The screw receiving groove extends through the mounting bracket and communicates with the screw through hole.

7. A rotary screening device for sand and gravel according to claim 6, characterized in that: The screw receiving groove is annular; The center of the screw receiving groove coincides with the center of the rotating shaft, so as to correspond to the movement trajectory of the screw through hole.

8. The sand and gravel rotary screening device according to claim 1, characterized in that: It also includes the power motor and the driven gear; The driven gear is sleeved on the flushing part; A drive gear is fixedly installed at the output end of the power motor; The driving gear meshes with the driven gear to drive the rinsing section and the screening section to rotate.

Images