Sand screening machine
By introducing the primary screening device and guide plate into the sand screening machine, the problem of sand particles entering the motor and screening barrel is solved, effective sand particles separation and protection are achieved, and screening efficiency and equipment life are improved.
Patent Information
- Application Number
- CN202422008863.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-08-19
AI Technical Summary
In existing sand screening machines, sand particles are prone to enter the motor, affecting the normal use of the motor, and large-diameter sand blocks or stones are likely to damage the screening cylinder, affecting the screening effect and service life.
A sand screening machine is designed, including a primary screening device and a guide plate. The primary screening device intercepts large-diameter sand blocks and gravels through the primary screening net. The guide plate guides fine sand particles, and combines the pulleys and conveyor belts to reduce sand entering the motor and protect the screen barrel.
It effectively reduces sand material entering the motor, protects the motor and screen barrel, improves screening efficiency and service life, and ensures screening effect.
Smart Images
Figure CN223288438U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sand screening, in particular to a sand screening machine. Background Art
[0002] Mortar preparation involves mixing sand and cementitious materials in a specific ratio, which affects the overall quality of the mortar. Sand, an important raw material, inevitably contains larger sand lumps or gravel. These impurities can affect the composition of the mortar, so the sand must be screened before making the mortar. A sand screen is a device used to screen sand. It utilizes the relative motion between the sand and the screen surface, allowing fine sand particles to pass through the sieve holes and be collected, thereby separating the larger sand lumps or gravel. For this purpose, the sand screening machine imitates the working principle of manually screening sand with an inclined screen. It uses an inclined screen drum to separate the input sand according to its diameter, and uses a conveying equipment to transport the sand to the top of the screen drum. The screen drum is driven by a motor to roll, so that the sand in the screen drum rolls, slides and is fully separated, so that the fine sand particles are screened out and collected, while the sand or gravel with larger particles slide along the inner wall of the inclined screen drum, and finally the sand or gravel with larger particles are collected to meet the needs of screening sand.
[0003] To facilitate the rotation of the sand screening machine's sieve drum, it's equipped with a motor. However, since the material being screened primarily consists of sand and gravel, sand inevitably enters the motor during operation. As the amount of sand entering the motor accumulates, it can interfere with the motor's operation and hinder the sand screening process. Furthermore, during the operation of the sand screening machine, the sand material inevitably contains oversized stones or sand clumps. Consequently, when these oversized stones or sand clumps fall onto the sieve drum, they damage the drum, affecting its screening efficiency and service life, ultimately impacting the sand screening process. Therefore, improvements are needed in the motor configuration and the design of the sieve drum to screen oversized stones or sand clumps. This can reduce the amount of sand entering the motor and prevent oversized stones or sand clumps from damaging the sieve drum, ensuring the sand screening machine's optimal performance. Summary of the Invention
[0004] In response to the shortcomings of the existing technology, the utility model provides a sand screening machine that can conveniently drive the screen drum to rotate, reduce the amount of sand entering the motor, prevent large-diameter sand blocks and stones from entering the screen drum, and facilitate the removal of large-diameter sand blocks and stones, thereby overcoming the defects of the existing technology.
[0005] The technical solution adopted by the utility model is as follows: a sand screening machine comprises a bracket, a lower hopper arranged on the bracket and a screen drum inclinedly arranged below the lower hopper, the top of the screen drum is rotatably connected to the feed hopper, the screen drum is connected to the lower hopper through the feed hopper, the bottom end of the screen drum is provided with a cover plate, a plurality of discharge chutes are provided on the cover plate, and the plurality of discharge chutes are arranged in a star shape on the cover plate, a first motor is provided on the side of the cover plate away from the screen drum, the middle part of the cover plate is connected to the driving shaft of the first motor, the plurality of discharge chutes are respectively located on the outside of the first motor, the first motor and the feed hopper are respectively connected to the bracket. A primary screening device is provided in the lower hopper; the primary screening device comprises a primary screening net with a movably buckled cover at the bottom of the lower hopper, a material baffle plate provided at one end of the primary screening net and a handle provided on the outside of the material baffle plate, a material taking trough is provided on one side of the lower hopper, the material baffle plate is sleeved in the material taking trough, and the bottom of the material baffle plate is hinged on the side wall of the lower hopper.
[0006] Preferably, two material guide plates are obliquely arranged on the bracket, the two material guide plates are respectively located on both sides of the screen drum, the two material guide plates are both installed on the bracket, the two sides of the feed hopper are respectively installed on the top of the two material guide plates, a fixed plate is provided at the bottom end of the material guide plate, the first motor is installed on the fixed plate, a partition plate is provided at the bottom of the feed plate, the partition plate is located on the side of the cover plate close to the screen drum, and the two ends of the partition plate are respectively installed on the two material guide plates.
[0007] Preferably, a fixed frame is provided below the screen drum, and two pulleys are rotatably provided on the fixed frame, one of the pulleys is provided with a second motor, the second motor is installed on the fixed frame, the drive shaft of the second motor is connected to one of the pulleys, and a conveyor belt is tensioned between the two pulleys, and the conveyor belt is located below the screen drum.
[0008] Preferably, a material guide bin is provided on one end of the fixed frame, the feed end of the material guide bin is located on one end of the material guide bin close to the screen drum, and the discharge end of the material guide bin is located on the bottom end of the material guide bin, one side of the conveyor belt is located in the material guide bin, and a scraping mechanism is provided in the material guide bin; the scraping mechanism includes a support rod fixed in the material guide bin, a bolt threaded on the support rod, a support plate movably mounted on the bolt, a scraper arranged on one side of the support plate close to the conveyor belt, and a spring arranged between the nut of the bolt and the support plate, one side of the scraper contacts the conveyor belt, the number of the bolts and springs is not less than two, the spring is mounted on the screw rod of the bolt, and the two ends of the spring are respectively in contact with the nut of the bolt and the support plate, a sleeve hole is provided on the support plate, the sleeve hole is movably mounted on the screw rod of the bolt, a threaded hole is provided on the support rod, and the screw rod of the bolt is connected to the support rod through the threaded hole.
[0009] Preferably, the lower hopper below the primary screen is provided with a through slot, which is provided on the side wall of the lower hopper close to the screen cylinder, and a sealing plate is arranged in the through slot for tilting and movement, and the bottom end of the sealing plate is in contact with the side wall of the lower hopper away from the screen cylinder, and the side wall of the lower hopper close to the screen cylinder is in contact with the top surface of the sealing plate, and a telescopic cylinder is provided on the top of the sealing plate, which is installed on the outer wall of the lower hopper, and the telescopic rod of the telescopic cylinder is installed on the sealing plate, and two limit plates are provided below the sealing plate, and the bottom surface of the sealing plate is in contact with the top surfaces of the two limit plates respectively, and the two limit plates are respectively installed on the inner walls on both sides of the lower hopper.
[0010] Preferably, the primary screen is composed of a plurality of V-shaped rods and a plurality of fixed rods that are crisscrossed with each other at equal intervals, and one end of each of the plurality of V-shaped rods is mounted on a material retaining plate.
[0011] Preferably, protective plates are provided on both sides of the primary screen respectively. The protective plates adopt a V-shaped structure, and the bottom ends of the protective plates are in contact with the ends of the fixing rods of the primary screen.
[0012] The beneficial effects of the present invention are as follows: first, the present invention transmits the rotation drive of the first motor to the screen drum through the provided cover plate, so as to drive the screen drum to rotate, and at the same time, guides and blocks the sand material output by the screen drum, so that the sand material in the screen drum is discharged from the discharge trough, so as to reduce the sand material from entering the first motor through the gap between the rotating shaft of the first motor and the housing of the first motor. In addition, the present invention performs preliminary filtering on the sand material put into the lower hopper through the provided primary screen, so that the large-diameter sand blocks and stones are intercepted on the primary screen, thereby preventing the large-diameter sand blocks and stones from entering the screen drum, so as to reduce the damage to the screen drum, and by pulling the handle, the baffle plate and the primary screen are driven to rotate around the bottom of the baffle plate, so as to facilitate the removal of the intercepted large-diameter sand blocks and stones through the material trough.
[0013] Secondly, the present invention guides and concentrates the fine sand particles passing through the holes on the surface of the screen drum by providing a guide plate, so as to facilitate collection of the fine sand particles. By providing a fixing plate at the bottom end of the guide plate, the first motor is installed and fixed, and the shielding effect of the first motor is improved, thereby further reducing the sand from entering the interior of the first motor. By providing a partition plate at the bottom of the feed plate, the sand discharged from the discharge trough is guided to facilitate collection of the sand discharged from the discharge trough. Furthermore, the present invention provides a pulley and a conveyor belt, so that the fine sand particles passing through the holes on the surface of the screen drum fall onto the conveyor belt. By driving the second motor to operate, the pulley and the conveyor belt are driven to operate, thereby driving the fine sand particles falling on the conveyor belt for transportation, thereby meeting the requirements for transporting fine sand particles.
[0014] Thirdly, the present invention sets a guide bin so that fine sand particles fall into the guide bin, and uses the guide bin to guide the fine sand particles so that the fine sand particles can be discharged in a concentrated manner. A scraper is set in the guide bin to scrape off the fine sand particles adsorbed on the conveyor belt, thereby improving the effect of collecting fine sand particles. The scraper is limited by the support rods, bolts, support plates and springs so that one side of the scraper is continuously pressed against the conveyor belt, thereby continuously scraping the conveyor belt. In addition, the present invention sets a sealing plate and a telescopic cylinder at the bottom of the lower hopper to control the degree of opening and closing of the lower hopper, so as to facilitate the control of the discharge speed of the lower hopper.
[0015] In addition, the utility model makes the primary screen mesh comprised of a plurality of V-shaped rods and a plurality of fixed rods crisscrossed at equal intervals, so that the primary screen mesh presents a V-shaped structure. Compared with a flat structure, the primary screen mesh has a larger passing area, which makes the screening efficiency higher. In addition, protective plates are respectively provided on both sides of the primary screen mesh to shield both sides of the primary screen mesh, thereby reducing the large-diameter sand and gravel from sliding out of the primary screen mesh, thereby improving the stability of cleaning large-diameter sand and gravel. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional schematic diagram of the present utility model.
[0017] Figure 2 It is a cross-sectional structural diagram of the present utility model.
[0018] Figure 3 for Figure 2 Enlarged schematic diagram of point A in the middle.
[0019] Figure 4 It is a cross-sectional assembly drawing of the lower hopper in the utility model.
[0020] Figure 5 for Figure 4 Enlarged schematic diagram of point B in the middle.
[0021] Figure 6 This is a cross-sectional assembly drawing of the fixed frame, pulley, conveyor belt and guide bin in the utility model.
[0022] Figure 7 for Figure 6 Enlarged schematic diagram of point C in the middle. DETAILED DESCRIPTION
[0023] like Figures 1 to 7As shown, a sand screening machine comprises a bracket 1, a lower hopper 2 arranged on the bracket 1 and a screen drum 3 inclinedly arranged below the lower hopper 2. The top end of the screen drum 3 is rotatably connected to the feed hopper 4, and the screen drum 3 is communicated with the lower hopper 2 through the feed hopper 4. A cover plate 5 is provided at the bottom end of the screen drum 3, and a plurality of discharge troughs 6 are opened on the cover plate 5. The plurality of discharge troughs 6 are arranged in a star shape on the cover plate 5. A first motor 7 is provided on the side of the cover plate 5 away from the screen drum 3. The middle part of the cover plate 5 is connected to the driving shaft of the first motor 7. The plurality of discharge troughs 6 are respectively located on the outside of the first motor 7. The first motor 7 and the feed hopper 4 are respectively connected to the bracket 1, and a primary screening device is arranged in the lower hopper 2; a bearing is provided on the top end of the screen drum 3, and the outer ring of the bearing and the inner ring of the bearing are respectively installed on the feed hopper 4 and the lower hopper 2. The hopper 4 and the screen drum 3 are connected in rotation through the bearing, so that the sand and gravel put into the lower hopper 2 are transported to the screen drum 3 through the feed hopper 4, and the first motor 7 is driven to operate, thereby driving the cover plate 5 and the screen drum 3 to rotate, and then the sand material transported to the screen drum 3 is screened, so that the fine sand particles pass through the holes on the surface of the screen drum 3, and the rest of the sand material transported to the screen drum 3 is discharged through the discharge chute 6 to quickly complete the sand screening operation. Since the fine sand particles have passed through the holes on the surface of the screen drum 3, the rest of the sand material transported to the screen drum 3 is discharged through the discharge chute 6, and the rotating shaft of the first motor 7 is blocked by the cover plate 5 to reduce the sand material from entering the first motor 7 from the gap between the rotating shaft of the first motor 7 and the housing of the first motor 7. The hopper 2 is provided with a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8 having a first sieve 8 and a second sieve 8
[0024] In this embodiment, two guide plates 12 are obliquely arranged on the bracket 1, and the two guide plates 12 are respectively located on both sides of the screen drum 3. The two guide plates 12 are both mounted on the bracket 1, thereby guiding and concentrating the fine sand particles passing through the holes on the surface of the screen drum 3 to facilitate collecting the fine sand particles; the two sides of the feed hopper 4 are respectively mounted on the top ends of the two guide plates 12, and the bottom ends of the guide plates 12 are provided with fixed plates 13, and the first motor 7 is mounted on the fixed plates 13, thereby fixing the feed hopper 4 and the first motor 7 and improving the shielding effect of the first motor 7, thereby further reducing the sand from entering the interior of the first motor 7, and a partition plate 14 is provided at the bottom of the feed plate 13, and the partition plate 14 is located on the side of the cover plate 5 close to the screen drum 3, and the two ends of the partition plate 14 are respectively mounted on the two guide plates 12, thereby guiding the sand discharged from the discharge trough 6 to facilitate collecting the sand discharged from the discharge trough 6.
[0025] Specifically, a fixed frame 15 is provided below the screen drum 3, and two pulleys 16 are rotatably provided on the fixed frame 15, one of the pulleys 16 is provided with a second motor 17, and the second motor 17 is installed on the fixed frame 15. The drive shaft of the second motor 17 is connected to one of the pulleys 16, and a conveyor belt 18 is tensioned between the two pulleys 16. The conveyor belt 18 is located below the screen drum 3, so that the fine sand particles passing through the holes on the surface of the screen drum 3 fall on the conveyor belt 18. At the same time, by driving the second motor 17 to operate, the pulley 16 and the conveyor belt 18 are driven to rotate, thereby driving the fine sand particles falling on the conveyor belt 18 to be transported to meet the requirements of fine sand transportation.
[0026] Please refer again Figure 1 and 6 A guide bin 19 is provided at one end of the fixed frame 15. The feed end of the guide bin 19 is located at the end of the guide bin 19 close to the screen drum 3, and the discharge end of the guide bin 19 is located at the bottom end of the guide bin 19. One side of the conveyor belt 18 is located in the guide bin 19. The conveyor belt 18 transports fine sand into the guide bin 19, so that the fine sand falls into the guide bin 19. The guide bin 19 is used to guide the fine sand so that the fine sand can be discharged in a concentrated manner. A scraping mechanism is provided in the guide bin 19; please refer to Figure 7The scraper mechanism includes a support rod 20 fixed in the guide bin 19, a bolt 21 threaded on the support rod 20, a support plate 22 movably set on the bolt 21, a scraper 23 set on the side of the support plate 22 close to the conveyor belt 18, and a spring 24 set between the nut of the bolt 21 and the support plate 22. One side of the scraper 23 is in contact with the conveyor belt 18. The number of the bolts 21 and the spring 24 is not less than two. The spring 24 is set on the screw of the bolt 21. The two ends of the spring 24 are in contact with the nut of the bolt 21 and the support plate 22 respectively. The support plate 22 is provided with a sleeve hole. The sleeve is movably mounted on the screw rod of the bolt 21, and a threaded hole is provided on the support rod 20. The screw rod of the bolt 21 is connected to the support rod 20 through the threaded hole. By relying on the elasticity of the spring 24, one side of the scraper 23 is pressed against the conveyor belt 18, so as to scrape off the fine sand adsorbed on the conveyor belt 18 and improve the effect of collecting fine sand. In addition, if the elasticity of the spring 24 decreases and it is difficult to press one side of the scraper 23 against the conveyor belt 18, the distance between the nut of the bolt 21 and the support rod 20 is adjusted by twisting the bolt 21 to press one side of the scraper 23 against the conveyor belt 18.
[0027] Please refer again Figures 1 to 3 The lower hopper 2 below the primary screen 8 is provided with a through slot 25, which is provided on the side wall of the lower hopper 2 close to the screen cylinder 3. A sealing plate 26 is provided in the through slot 25 for tilting and movement. The bottom end of the sealing plate 26 contacts the side wall of the lower hopper 2 away from the screen cylinder 3, and the side wall of the lower hopper 2 close to the screen cylinder 3 contacts the top surface of the sealing plate 26. A telescopic cylinder 27 is provided on the top of the sealing plate 26. The telescopic cylinder 27 is installed on the outer wall of the lower hopper 2, and the telescopic rod of the telescopic cylinder 27 is installed on the sealing plate 26. The two sides of the sealing plate 26 are respectively in contact with the lower hopper 2. The inner walls of the hopper 2 are in contact with each other, and two limit plates 28 are arranged below the sealing plate 26. The bottom surface of the sealing plate 26 is in contact with the top surfaces of the two limit plates 28 respectively. The two limit plates 28 are respectively installed on the inner walls on both sides of the lower hopper 2. The sealing plate 26 controls the degree of opening and closing of the discharge of the lower hopper 2. By controlling the telescopic cylinder 27 to extend and retract, the sealing plate 26 is pulled to slide on the top surfaces of the two limit plates 28, thereby adjusting the position of the sealing plate 26, and then adjusting the degree of opening and closing of the discharge of the lower hopper 2, which is convenient for controlling the discharge speed of the lower hopper 2.
[0028] In this embodiment, the primary screen 8 is composed of a number of V-shaped rods and a number of fixed rods that are equally spaced and crisscrossed. One end of the several V-shaped rods is installed on the material baffle plate 9, so that the primary screen 8 presents a V-shaped structure. Compared with the plane structure, the primary screen 8 has a larger passing area, which makes the screening efficiency higher.
[0029] Specifically, protective plates 29 are respectively provided on both sides of the primary screen 8. The protective plates 29 adopt a V-shaped structure. The bottom ends of the protective plates 29 are in contact with the ends of the fixed rods of the primary screen 8, thereby blocking both sides of the primary screen 8. During the rotation of the primary screen 8, large-diameter sand blocks and stones are reduced from sliding out of the primary screen 8, thereby improving the stability of cleaning large-diameter sand blocks and stones.
[0030] The method of using this product is as follows: Figures 1 to 7 As shown, first, the telescopic cylinder 27 is controlled to extend so that the discharge port of the lower hopper 2 is blocked by the sealing plate 26, that is, the discharge port of the lower hopper 2 is controlled to be in a closed state, and the sand material to be screened is thrown into the lower hopper 2 from the top of the lower hopper 2 by using a conveying equipment; the first motor 7 and the second motor 17 are started to drive the screen drum 3 and the conveyor belt 18 to run. Then, the telescopic cylinder 27 is controlled to be shortened so that the sand in the lower hopper 2 flows into the feed hopper 4. In order to avoid excessive sand stored in the lower hopper 2, the discharge amount of the lower hopper 2 is controlled to be not less than the feed amount of the lower hopper 2. For this reason, the sand in the lower hopper 2 is screened by the primary screen 8 and then transported to the screen drum 3 through the feed hopper 4, so that the rotation of the screen drum 3 drives the sand in the screen drum 3 to repeatedly roll, slide and fully separate, that is, the fine sand particles pass through the holes on the surface of the screen drum 3. Under the guidance of the guide plate 12, the fine sand particles fall on the conveyor belt 18 and are transported to the guide bin 19 through the conveyor belt 18 to discharge the fine sand particles in a concentrated manner; at the same time, the remaining sand in the screen drum 3 is discharged through the discharge trough 6 and is discharged in a concentrated manner using the partition plate 14 to complete the sand screening effect. In addition, in order to prevent the large particles of stone or sand sifted out on the primary screen 8 from affecting the output of sand material from the lower hopper 2, the primary screen 8 needs to be cleaned regularly; when cleaning, first temporarily stop the feed of the lower hopper 2, and after the sand material in the lower hopper 2 is discharged, turn off the first motor 7 and the second motor 17, and by pulling the handle 10, drive the baffle plate 9 and the primary screen 8 to rotate around the bottom of the baffle plate 9, and use the protective plate 29 to limit the two sides of the primary screen 8 to reduce the large-diameter sand and stones from sliding out of the primary screen 8, thereby facilitating the removal of the intercepted large-diameter sand and stones through the material trough 11.
[0031] According to this embodiment, the rotation drive of the first motor 7 is transmitted to the screen drum 3 through the provided cover plate 5, so as to drive the screen drum 3 to rotate. At the same time, the sand material output by the screen drum 3 is guided and blocked, so that the sand material in the screen drum 3 is discharged from the discharge trough 6, so as to reduce the sand material from entering the first motor 7 through the gap between the rotating shaft of the first motor 7 and the housing of the first motor 7. Moreover, according to this embodiment, the sand material put into the lower hopper 2 is preliminarily filtered by the provided primary screen 8, so that the large-diameter sand blocks and stones are intercepted on the primary screen 8, thereby preventing the large-diameter sand blocks and stones from entering the screen drum 3, so as to reduce the damage to the screen drum 3, and by pulling the handle 10, the baffle plate 9 and the primary screen 8 are driven to rotate around the bottom of the baffle plate 9, so as to remove the intercepted large-diameter sand blocks and stones through the material taking trough 11.
[0032] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.
Claims
1. A sand screening machine, comprising a support (1), a lower hopper (2) provided on the support (1), and a screen drum (3) provided obliquely below the lower hopper (2), characterized in that: The top end of the screen drum (3) is rotatably connected to a feed hopper (4), the screen drum (3) is connected to the lower hopper (2) through the feed hopper (4), the bottom end of the screen drum (3) is provided with a cover plate (5), a plurality of discharge troughs (6) are opened on the cover plate (5), and the plurality of discharge troughs (6) are arranged in a star shape on the cover plate (5), a first motor (7) is provided on the side of the cover plate (5) away from the screen drum (3), the middle part of the cover plate (5) is connected to the driving shaft of the first motor (7), the plurality of discharge troughs (6) are respectively located on the outside of the first motor (7), the first motor (7) and the feed hopper (4) are respectively connected to the bracket (1), and a primary screening device is provided in the lower hopper (2); The primary screening device comprises a primary screening net (8) with a movable buckle cover at the bottom of the lower hopper (2), a baffle plate (9) provided at one end of the primary screening net (8), and a handle (10) provided on the outer side of the baffle plate (9); a material taking trough (11) is provided on one side of the lower hopper (2); the baffle plate (9) is sleeved in the material taking trough (11), and the bottom of the baffle plate (9) is hinged to the side wall of the lower hopper (2).
2. The sand screening machine according to claim 1, characterized in that: Two guide plates (12) are obliquely arranged on the bracket (1), and the two guide plates (12) are respectively located on both sides of the screen drum (3). The two guide plates (12) are both mounted on the bracket (1), and both sides of the feed hopper (4) are respectively mounted on the top ends of the two guide plates (12). A fixed plate (13) is provided at the bottom end of the guide plate (12), and the first motor (7) is mounted on the fixed plate (13). A partition plate (14) is provided at the bottom of the feed plate (13), and the partition plate (14) is located on the side of the cover plate (5) close to the screen drum (3). The two ends of the partition plate (14) are respectively mounted on the two guide plates (12).
3. The sand screening machine according to claim 1, characterized in that: A fixed frame (15) is provided below the screen drum (3), and two pulleys (16) are rotatably provided on the fixed frame (15), one of the pulleys (16) is provided with a second motor (17), the second motor (17) is mounted on the fixed frame (15), a drive shaft of the second motor (17) is connected to one of the pulleys (16), a conveyor belt (18) is tensioned between the two pulleys (16), and the conveyor belt (18) is located below the screen drum (3).
4. The sand screening machine according to claim 3, characterized in that: A material guide bin (19) is provided at one end of the fixed frame (15), a feed end of the material guide bin (19) is located at one end of the material guide bin (19) close to the screen drum (3), a discharge end of the material guide bin (19) is located at the bottom end of the material guide bin (19), one side of the conveyor belt (18) is located in the material guide bin (19), and a scraping mechanism is provided in the material guide bin (19); the scraping mechanism includes a support rod (20) fixedly provided in the material guide bin (19), a bolt (21) threadedly provided on the support rod (20), a support plate (22) movably mounted on the bolt (21), and a support plate (22) provided on one side of the support plate (22) close to the conveyor belt (18). A spring (24) is provided between the scraper (23) and the nut of the bolt (21) and the support plate (22). One side of the scraper (23) contacts the conveyor belt (18). The number of the bolt (21) and the spring (24) is not less than two. The spring (24) is sleeved on the screw of the bolt (21). The two ends of the spring (24) are in contact with the nut of the bolt (21) and the support plate (22) respectively. A sleeve hole is provided on the support plate (22), and the sleeve hole is movably sleeved on the screw of the bolt (21). A threaded hole is provided on the support rod (20), and the screw of the bolt (21) is connected to the support rod (20) through the threaded hole.
5. The sand screening machine according to claim 1, characterized in that: The lower hopper (2) below the primary screen (8) is provided with a through groove (25), the through groove (25) being provided on the side wall of the lower hopper (2) close to the screen cylinder (3), and a sealing plate (26) being provided in an inclined manner in the through groove (25), the bottom end of the sealing plate (26) being in contact with the side wall of the lower hopper (2) away from the screen cylinder (3), the side wall of the lower hopper (2) close to the screen cylinder (3) being in contact with the top surface of the sealing plate (26), and the top end of the sealing plate (26) being provided with a telescopic cylinder (27), the telescopic cylinder (27) being installed on the outer wall of the lower hopper (2), the telescopic rod of the telescopic cylinder (27) being installed on the sealing plate (26), and two limit plates (28) being provided below the sealing plate (26), the bottom surface of the sealing plate (26) being in contact with the top surfaces of the two limit plates (28), and the two limit plates (28) being installed on the inner walls on both sides of the lower hopper (2).
6. The sand screening machine according to claim 1, characterized in that: The primary screen (8) is composed of a plurality of V-shaped rods and a plurality of fixed rods that are crisscrossed at equal intervals, and one end of each of the plurality of V-shaped rods is mounted on a material blocking plate (9).
7. The sand screening machine according to claim 6, characterized in that: Protective plates (29) are respectively provided on both sides of the primary screen (8). The protective plates (29) have a V-shaped structure, and the bottom ends of the protective plates (29) are in contact with the ends of the fixing rods of the primary screen (8).