A prescreening device for blasting with anticorrosion

Abstract

This utility model belongs to the technical field of sandblasting equipment, specifically relating to a pre-screening device for anti-corrosion sandblasting. It includes a frame and a pre-screening mechanism on the frame. The pre-screening mechanism includes a first cylinder, a second cylinder, and a third cylinder arranged at an incline and nested sequentially. Both ends of the second cylinder extend beyond the first cylinder, and both ends of the third cylinder extend beyond the second cylinder. Screen holes are evenly distributed on both the second and third cylinders. A second spiral blade is fixedly installed on the inner wall of the second cylinder, and a third spiral blade is fixedly installed on the inner wall of the third cylinder. A feed inlet is provided at the upper end of the third cylinder, and a first discharge outlet, a second discharge outlet, and a third discharge outlet are respectively provided at the lower ends of the first, second, and third cylinders. A driving device is also provided on the frame to drive the second and third cylinders to rotate in opposite directions. This utility model pre-filters and screens the sand, separating sand particles of the appropriate size for sandblasting, while larger and smaller particles are collected and processed separately.

Description

Technical Field

[0001] This utility model belongs to the technical field of sandblasting equipment, specifically relating to a pre-screening device for anti-corrosion sandblasting. Background Technology

[0002] Currently, many workpieces require surface treatment before anti-corrosion treatment to ensure their surface quality and avoid rust or other defects that could affect the effectiveness of subsequent anti-corrosion treatment. Sandblasting is often used for surface treatment to remove rust.

[0003] Sandblasting uses compressed air as power to propel steel shot at high speed onto the surface of the workpiece to achieve surface treatment. However, on the one hand, the sand used for sandblasting often contains large-volume particulate impurities, which adversely affects the sandblasting quality. On the other hand, after sandblasting, some of the sand breaks into fine sand. When reused, the fine sand not only reduces the sandblasting efficiency but also affects the surface roughness of the workpiece.

[0004] Whether the volume is too large or too small, it will lead to uneven sandblasting during the sandblasting process, thus affecting the sandblasting effect and reducing product quality. Summary of the Invention

[0005] This invention addresses the problem that during sandblasting of workpieces, the presence of large or small sand particles within the sand can affect the uniformity of sandblasting, thereby impacting the sandblasting effect and reducing product quality. It provides a pre-screening device for anti-corrosion sandblasting, which filters and separates sand particles of appropriate sizes for sandblasting, while larger and smaller particles are collected and processed separately.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A pre-screening device for anti-corrosion sandblasting includes a frame and a pre-screening mechanism mounted on the frame. The pre-screening mechanism includes a first cylinder inclined and fixedly mounted on the frame, a second cylinder rotatably sleeved within the first cylinder, and a third cylinder rotatably sleeved within the second cylinder. Both ends of the second cylinder extend beyond the first cylinder, and both ends of the third cylinder extend beyond the second cylinder. Screen holes are evenly distributed on both the second and third cylinders. A second helical blade is fixedly mounted on the inner wall of the second cylinder, and a third helical blade is fixedly mounted on the inner wall of the third cylinder. A feed inlet is located at the upper end of the third cylinder, and a first discharge outlet, a second discharge outlet, and a third discharge outlet are respectively located at the lower ends of the first, second, and third cylinders. A driving device is also mounted on the frame to drive the second and third cylinders to rotate in opposite directions. The helical blades extend the travel of the sand within the cylinders, and the opposite rotation of the second and third cylinders achieves mixing of multiple sand particles, ensuring rapid and thorough separation of sand particles of different sizes.

[0007] Preferably, the driving device includes a power mechanism and a reversing mechanism. The reversing mechanism includes a connecting shaft, a first gear, and a second gear. The output end of the power mechanism is fixedly connected to the connecting shaft for driving the connecting shaft to rotate. The first gear and the second gear are fixedly sleeved on the connecting shaft. The first gear and the second gear are respectively used to drive the third cylinder and the second cylinder to rotate. The rotation directions of the third cylinder and the second cylinder are opposite. The power mechanism drives the second cylinder and the third cylinder to rotate.

[0008] Preferably, a first gear ring is fixedly sleeved on the outer side of the upper end of the third cylinder, the first gear ring meshes with the first gear, and the first gear ring drives the third cylinder to rotate synchronously.

[0009] Preferably, a second gear ring is fixedly connected to the inner side of the upper end of the second cylinder, the second gear ring meshes with the second gear, and the second gear ring drives the second cylinder to rotate synchronously.

[0010] Preferably, the first discharge port is located at the lower outer side of the lower end of the first cylinder, and the smaller sand particles screened out are discharged and collected from the first discharge port.

[0011] Preferably, the second discharge port includes multiple openings evenly spaced circumferentially on the outer side of the lower end of the second cylinder. As the second cylinder rotates, sand of the qualified particle size is discharged and collected from the multiple openings.

[0012] Preferably, the sieve aperture on the second cylinder is smaller than the sieve aperture on the outer side of the third cylinder, and is used to screen out sand with qualified particle size and sand with smaller particle size, respectively.

[0013] Preferably, the inner diameter of the first cylinder is larger than the outer diameter of the second cylinder, and the inner diameter of the second spiral blade is larger than the outer diameter of the third cylinder.

[0014] Preferably, the two ends of the third cylinder are rotatably sleeved inside the second cylinder via corresponding bearings, and the two ends of the second cylinder are rotatably sleeved inside the first cylinder via corresponding bearings.

[0015] Preferably, the upper inlet of the third cylinder is a feed inlet and the lower outlet is a discharge outlet. The material to be screened enters the third cylinder from the feed inlet and discharges larger particles or sand from the discharge outlet.

[0016] The beneficial effects of this utility model through the above technical solution are as follows: 1. This utility model feeds sand into a third cylinder through the feed inlet. The larger sand particles are retained in the third cylinder and discharged through the third discharge outlet for collection. The remaining sand enters the second cylinder. The smaller sand particles pass through the sieve of the second cylinder into the first cylinder and are discharged through the first discharge outlet for collection. The sand particles with suitable particle size are discharged through the second discharge outlet for collection and utilization. The relatively uniform sand particles are then used for sandblasting, ensuring the surface quality of the sandblasted workpiece.

[0017] 2. This utility model extends the travel of the sand body within the corresponding cylinder by setting a second spiral blade and a third spiral blade on the inner side of the second cylinder and the third cylinder respectively, thereby ensuring more thorough screening of the sand body.

[0018] 3. This utility model drives the second cylinder and the third cylinder to rotate in opposite directions. On the one hand, the second and third stirring blades are used to stir the sand in the sand to ensure the screening effect and ensure that the larger or smaller particles in the sand are fully separated. On the other hand, the conveying effect of the spiral blades is used to speed up the screening speed, reduce the screening time and improve efficiency while ensuring thorough screening. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure One .

[0020] Figure 2 This is a schematic diagram of the structure of the present invention. Figure Two .

[0021] Figure 3 This is a schematic diagram of the structure of the present invention. Figure Three .

[0022] Figure 4 This is a schematic diagram of the structure of the present invention. Figure Four .

[0023] The numbers in the attached diagram are as follows: 1 is the first cylinder, 2 is the second cylinder, 3 is the third cylinder, 4 is the second helical blade, 5 is the third helical blade, 6 is the feed inlet, 7 is the first discharge outlet, 8 is the second discharge outlet, 9 is the third discharge outlet, 10 is the connecting shaft, 11 is the first gear, 12 is the second gear, 13 is the first gear ring, and 14 is the second gear ring. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-4As shown, this embodiment provides a pre-screening device for anti-corrosion sandblasting, including a frame and a pre-screening mechanism (the frame is not shown in the figure) mounted on the frame. The pre-screening mechanism includes a first cylinder 1 that is inclined and fixedly mounted on the frame, a second cylinder 2 that is rotatably mounted inside the first cylinder 1, and a third cylinder 3 that is rotatably mounted inside the second cylinder 2. The two ends of the third cylinder 3 are rotatably mounted inside the second cylinder 2 through corresponding bearings, and the two ends of the second cylinder 2 are rotatably mounted inside the first cylinder 1 through corresponding bearings. That is, the first cylinder 1 is fixedly mounted on the frame, and the second cylinder 2 and the third cylinder 3 are rotatably mounted inside the first cylinder 1.

[0025] The second cylinder 2 extends out of the first cylinder 1 at both ends. The upper end of the third cylinder 3 is provided with a feed inlet 6, which is the inlet at the higher end of the third cylinder 3, and is used to put in the sand to be screened. The second cylinder 2 extends out of the second cylinder 3 at both ends. The second cylinder 2 and the third cylinder 3 are evenly provided with screen holes (not shown in the figure), and the sand of different particle sizes is separated through the screen holes.

[0026] The first cylinder 1, the second cylinder 2, and the third cylinder 3 are respectively provided with a first discharge port 7, a second discharge port 8, and a third discharge port 9 at their lower ends. The first discharge port 7 is located on the lower outer side of the first cylinder 1 and is used to discharge unqualified sand with smaller particle size from the first cylinder 1. The second discharge port 8 includes multiple openings evenly spaced on the lower outer side of the second cylinder 2 and is used to discharge qualified sand with qualified particle size from the second cylinder 2. The upper inlet of the third cylinder 3 is a feed port 6, and the lower outlet is a third discharge port 9. The third discharge port 9 is the outlet at the lower end of the third cylinder 3 and is used to discharge unqualified sand with larger particle size or other particulate matter from the third cylinder 3.

[0027] The inner wall of the second cylinder 2 is fixedly provided with a second spiral blade 4, and the inner wall of the third cylinder 3 is fixedly provided with a third spiral blade 5. The inner diameter of the first cylinder 1 is larger than the outer diameter of the second cylinder 2, and the inner diameter of the second spiral blade 4 is larger than the outer diameter of the third cylinder 3. Since the first cylinder 1, the second cylinder 2 and the third cylinder 3 are installed at an incline on the frame, after the sand enters the third cylinder 3 or the second cylinder, it slides down along its incline direction and is screened using the screen holes on it. The second spiral blade 4 and the third spiral blade 5 extend its sliding stroke to ensure sufficient screening.

[0028] The frame is also equipped with a drive device for driving the second cylinder 2 and the third cylinder 3 to rotate in opposite directions. Through the opposite rotation of the second cylinder 2 and the third cylinder 3, on the one hand, the sand to be screened is stirred, which further ensures the full screening of the sand and the contact of the remaining screen holes, while ensuring that the sand slides down smoothly. On the other hand, under the conveying action of the spiral blades, the screening efficiency is ensured and rapid screening is achieved.

[0029] The driving device includes a power mechanism and a reversing mechanism. The reversing mechanism includes a connecting shaft 10, a first gear 11, and a second gear 12. The output end of the power mechanism is fixedly connected to the connecting shaft 10 for driving the connecting shaft 10 to rotate. The first gear 11 and the second gear 12 are fixedly sleeved on the connecting shaft 10. The first gear 11 and the second gear 12 are respectively used to drive the third cylinder 3 and the second cylinder 2 to rotate. The rotation directions of the third cylinder 3 and the second cylinder 2 are opposite. A first gear ring 13 is fixedly sleeved on the outer side of the upper end of the third cylinder 3, and the first gear ring 13 meshes with the first gear 11. A second gear ring 14 is fixedly connected to the inner side of the upper end of the second cylinder 2. The second gear ring 14 meshes with the second gear 12, driving the connecting shaft 10 to rotate via the power mechanism, which in turn drives the first gear 11 and the second gear 12 to rotate synchronously. Since the first gear 11 meshes with the first gear ring 13 on the outer side of the third cylinder 3, the first gear ring 13 and the first gear 11 rotate in opposite directions, and thus the rotation direction of the third cylinder 3 is opposite to the rotation direction of the first gear 11. Since the second gear 12 meshes with the second gear ring 14 on the inner side of the second cylinder 2, the second gear ring 14 rotates in the same direction as the second gear 12, and thus the rotation direction of the second cylinder 2 is the same as the rotation direction of the second gear 12. Based on the above, the rotation directions of the second cylinder 2 and the third cylinder 3 are opposite.

[0030] As one possible implementation method, the power mechanism is an electric motor.

[0031] The sieve aperture on the second cylinder 2 is smaller than the sieve aperture on the outer side of the third cylinder 3. The sieve aperture on the third cylinder 3 is used to separate larger particles in the sand body, while the sieve aperture on the second cylinder 2 is used to separate sand bodies with qualified particle sizes from sand bodies or particles with smaller particle sizes.

[0032] In use, the power mechanism is started, driving the second cylinder 2 and the third cylinder 3 to rotate in opposite directions. Then, the sand to be screened is added into the third cylinder 3 through the feed port 6. It is screened for the first time through the screen holes on the third cylinder 3, so that the larger particles remain in the third cylinder 3 and are discharged from the third discharge port 9 for collection during the rotation of the third cylinder 3 by the conveying action of the third spiral blade 5 for subsequent processing. The remaining sand passes through the screen holes on the third cylinder 3 and enters the second cylinder 2, and is screened for the second time through the screen holes on the second cylinder 2. The sand with qualified particle size remains in the second cylinder 2. The smaller sand or other particles pass through the screen holes on the second cylinder 2 and enter the first cylinder 1, and are discharged from the first discharge port 7 along the inclined surface of the lower side of the first cylinder 1 for collection for subsequent processing. The sand with qualified particle size in the second cylinder 2 is discharged and collected through multiple openings of the second discharge port 8 for sandblasting, ensuring the uniformity of sandblasting during the surface treatment of the corresponding workpiece and ensuring the surface roughness of the treated workpiece.

[0033] During the reverse rotation of the second cylinder 2 and the third cylinder 3, the second spiral blade 4 or the third spiral blade 5 inside rotate simultaneously. On the one hand, the sand to be screened is stirred to ensure that it is in full contact with the inner wall of the corresponding cylinder and that the sieve holes on the inner wall of the cylinder screen it thoroughly. On the other hand, the conveying action of the spiral blades during rotation ensures that it is quickly discharged from the corresponding cylinder, thereby improving the screening efficiency.

[0034] 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 pre-screening device for anti-corrosion sandblasting, characterized in that, The device includes a frame and a pre-screening mechanism mounted on the frame. The pre-screening mechanism includes a first cylinder (1) that is inclined and fixedly mounted on the frame, a second cylinder (2) that is rotatably mounted inside the first cylinder (1), and a third cylinder (3) that is rotatably mounted inside the second cylinder (2). The two ends of the second cylinder (2) extend out of the first cylinder (1), and the two ends of the third cylinder (3) extend out of the second cylinder (2). Screen holes are evenly distributed on both the second cylinder (2) and the third cylinder (3). The inner wall of the second cylinder (2) is fixedly provided with a second spiral blade (4), the inner wall of the third cylinder (3) is fixedly provided with a third spiral blade (5), the upper end of the third cylinder (3) is provided with a feed inlet (6), and the lower ends of the first cylinder (1), the second cylinder (2) and the third cylinder (3) are respectively provided with a first discharge outlet (7), a second discharge outlet (8) and a third discharge outlet (9); The frame is also equipped with a drive device for driving the second cylinder (2) and the third cylinder (3) to rotate in opposite directions.

2. A pre-sifting device for blasting with corrosion protection according to claim 1, characterized in that The driving device includes a power mechanism and a reversing mechanism. The reversing mechanism includes a connecting shaft (10), a first gear (11), and a second gear (12). The output end of the power mechanism is fixedly connected to the connecting shaft (10) for driving the connecting shaft (10) to rotate. The first gear (11) and the second gear (12) are fixedly sleeved on the connecting shaft (10). The first gear (11) and the second gear (12) are respectively used to drive the third cylinder (3) and the second cylinder (2) to rotate. The rotation directions of the third cylinder (3) and the second cylinder (2) are opposite.

3. The pre-screening device for anti-corrosion sandblasting according to claim 2, characterized in that, The upper outer side of the third cylinder (3) is fixedly fitted with a first gear ring (13), which meshes with the first gear (11).

4. The pre-screening device for anti-corrosion sandblasting according to claim 2, characterized in that, The second gear ring (14) is fixedly connected to the inner side of the upper end of the second cylinder (2), and the second gear ring (14) meshes with the second gear (12).

5. A pre-screening device for anti-corrosion sandblasting according to claim 1, characterized in that, The first discharge port (7) is located on the lower outer side of the first cylinder (1).

6. A pre-sifting device for blasting with corrosion protection according to claim 1, characterized in that The second discharge port (8) includes multiple openings evenly spaced around the lower outer side of the second cylinder (2).

7. A pre-sifting device for blasting with corrosion protection according to claim 1, characterized in that The sieve aperture on the second cylinder (2) is smaller than the sieve aperture on the outer side of the third cylinder (3).

8. A pre-sifting device for blasting with corrosion protection according to claim 1, characterized in that The inner diameter of the first cylinder (1) is greater than the outer diameter of the second cylinder (2), and the inner diameter of the second spiral blade (4) is greater than the outer diameter of the third cylinder (3).

9. A pre-screening device for anti-corrosion sandblasting according to claim 1, characterized in that, The two ends of the third cylinder (3) are rotatably sleeved inside the second cylinder (2) through corresponding bearings, and the two ends of the second cylinder (2) are rotatably sleeved inside the first cylinder (1) through corresponding bearings.

10. A pre-sifting device for blasting with corrosion protection according to claim 1, characterized in that The upper inlet of the third cylinder (3) is the feed inlet (6), and the lower outlet is the third discharge outlet (9).

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