Gravel screening device

Abstract

The utility model belongs to the technical field of gravel screening devices, and particularly relates to a gravel screening device which comprises a filtering shell, a feeding shell is fixedly installed at the top of the filtering shell, a discharging opening of the feeding shell is communicated with a feeding opening of the filtering shell, a sliding groove is formed in the feeding shell, and a sliding plate is installed in the sliding groove in a sliding mode. The driving assembly is located in the feeding shell and used for driving the sliding plate to slide; the first filter screen and the second filter screen are rotationally installed in the filter shell, a second filter screen is rotationally installed in the filter shell and located below the first filter screen, the left end of the first filter screen penetrates through the filter shell and extends to the outside, and the right end of the second filter screen penetrates through the filter shell and extends to the outside. When the whole device is used, the feeding speed can be adjusted according to different types of sand and stones, meanwhile, three types of sand and stones with different sizes can be filtered, and the filter screen cannot be blocked when the sand and stones are filtered.

Description

Technical Field

[0001] The utility model belongs to the technical field of sand and gravel screening devices, in particular to a sand and gravel screening device. Background Art

[0002] Sand and gravel refer to a loose mixture of sand particles and crushed stone. The structures of different sand and gravel vary greatly. Some have uniform particles of fineness, while others vary in size. Some sand and gravel have well-rounded fragments, while others have sharp edges and corners. Sand and gravel are loose materials, but their particles are generally hard and their chemical properties are stable under the surface environment.

[0003] For example, the Chinese patent with the publication number CN214347755U discloses a sandstone drying and screening device, including a frame, a feed port is provided on the top of the frame, a first screening plate, a second screening plate and a sliding plate are provided on the inner side of the frame from top to bottom, a heater is provided on the top of the frame, and a plurality of hot air blowers are provided on both sides of the inner wall of the frame. In the utility model, the temperature inside the frame is increased by the heater, and the air inside the frame is quickly circulated by the hot air blower to dry the sandstone in the drying box, and the scattering stick provided inside the feed port disperses the accumulated sandstone, so that the sandstone can contact with the hot air in a large area after entering the frame, so as to better dry the sandstone, and then the first screening plate and the second screening plate are used for screening, and the sandstone of different sizes is classified and collected for later use, so as to integrate drying and sun drying, improve efficiency, save manpower and material resources, and has a simple structure and high practicality.

[0004] The above patent has the following problems:

[0005] This patent has some disadvantages when in use, such as: when the above device is in use, sand and gravel may accumulate on the top of the screening plate, causing the screening plate to be blocked, resulting in a low screening speed. At the same time, the sand and gravel screening device may face different working conditions and requirements in actual applications, such as sand and gravel of different particle sizes, different production requirements, etc., and the above device cannot adjust the feed speed, resulting in the equipment being unable to meet the screening requirements under different working conditions. In view of this, we propose a sand and gravel screening device. Utility Model Content

[0006] The purpose of the utility model is to provide a sand and gravel screening device to solve the problems raised in the above background technology.

[0007] In view of this, the utility model provides a sand and gravel screening device, comprising:

[0008] A filter shell, a feed shell is fixedly installed on the top of the filter shell, the discharge port of the feed shell is connected to the feed port of the filter shell, a sliding groove is opened in the feed shell, and a sliding plate is slidably installed in the sliding groove;

[0009] A driving assembly, the driving assembly is located in the feed shell and is used to drive the sliding plate to slide;

[0010] Filter screen 1, the filter screen 1 is rotatably installed in the filter housing, filter screen 2 is rotatably installed in the filter housing and below the filter screen 1, the left end of the filter screen 1 penetrates the filter housing and extends to the outside, the right end of the filter screen 2 penetrates the filter housing and extends to the outside, two rotating columns are rotatably installed in the filter housing, and the two rotating columns are respectively located at the bottom of the filter screen 1 and the filter screen 2, the circumferential side walls of the two rotating columns are respectively in contact with the bottom of the filter screen 1 and the filter screen 2, and the circumferential side walls of the rotating columns are symmetrically fixed with arc strips;

[0011] A power assembly is located on the filter housing and is used to drive the two rotating columns to rotate simultaneously.

[0012] In the technical solution, when the sand and gravel need to be screened, the sand and gravel are first poured into the feed shell, and then the feed speed is adjusted according to the type of sand and gravel. The driving assembly provided can drive the sliding plate to slide, and then the discharge port of the feed shell will gradually become larger. When the discharge speed is appropriate, the driving assembly provided stops the sliding plate from sliding, and finally the sand and gravel enter the filter shell from the discharge port of the feed shell.

[0013] Through the arranged power assembly, the two rotating columns can be driven to rotate, and the two rotating columns respectively drive the four arc-shaped bars to rotate. When one of the arc-shaped bars contacts the bottom of the filter screen one, one end of the filter screen one will be lifted up, and then one end of the filter screen one will rotate downward under the action of gravity, so that the sand and gravel on the filter screen one can rise and fall during screening, and the sand and gravel will not block the filter screen one. The large pieces of sand and gravel will stay on the top of the filter screen one, and the other sand and gravel will be filtered by the filter screen one and fall to the top of the filter screen two. After the above operation, the medium-sized sand and gravel will stay on the top of the filter screen two, and the smallest sand and gravel will be filtered by the filter screen two and fall to the bottom of the filter shell, so that three different sizes of sand and gravel can be filtered, and the sand and gravel will not cause the filter screen to be blocked during filtering.

[0014] In the above technical solution, further, it also includes:

[0015] Three collecting shells are respectively arranged at the left end of filter screen one, the right end of filter screen two and the discharge port of the filter shell. The three collecting shells are fixedly connected to the filter shell, and a limiting plate is inserted and installed on one side of the collecting shell.

[0016] In this technical solution, large pieces of sand and gravel will stay on the top of filter mesh one and then move toward the direction of the corresponding collecting shell, and then the large pieces of sand and gravel will enter the corresponding collecting shell and be collected, and other sand and gravel will be filtered by filter mesh one and fall to the top of the guide plate, and then enter the top of filter mesh two along the guide plate, and then through the above operation, medium-sized sand and gravel will move toward the direction of the corresponding collecting shell, and finally the medium-sized sand and gravel will enter the corresponding collecting shell and be collected, and the smallest sand and gravel will be filtered by filter mesh two, fall to the bottom of the filter shell, and then all enter the corresponding collecting shell and be collected.

[0017] In the above technical solution, further, the driving component includes:

[0018] A threaded rod is rotatably mounted in the sliding groove, and one end of the threaded rod passes through the sliding plate and the sliding groove and extends to the outside and is fixedly mounted with an operating handle, and the threaded rod is threadedly connected to the sliding plate.

[0019] In the present technical solution, when it is necessary to screen sand and gravel, first pour the sand and gravel into the feed shell, and then adjust the feed speed according to the type of sand and gravel. First, turn the operating handle and drive the threaded rod to rotate. Under the action of the thread, the threaded rod drives the sliding plate to slide, and then the discharge port of the feed shell will gradually become larger. When the discharge speed is appropriate, stop turning the operating handle, the sliding plate stops sliding, and finally the sand and gravel enter the filter shell from the discharge port of the feed shell.

[0020] In the above technical solution, further, the power assembly includes:

[0021] A motor, the motor is fixedly mounted on one side of the filter housing, and the motor is located on one side of one of the rotating columns, a transmission wheel 1 is fixedly mounted on the output shaft of the motor, one end of the transmission wheel 1 penetrates the filter housing and is coaxially connected to one of the rotating columns, and one end of the transmission wheel 1 is rotatably connected to the filter housing;

[0022] Transmission wheel 2 is rotatably installed on one side of the filter shell, and transmission wheel 2 is located on one side of another rotating column. One end of transmission wheel 2 passes through the filter shell and is coaxially connected to another rotating column. Transmission wheel 2 is located above transmission wheel 1, and a transmission belt is installed between transmission wheel 2 and transmission wheel 1.

[0023] In the technical solution, the motors are started at the same time, and the motors are powered on to drive the transmission wheel 1 to rotate, the transmission wheel 1 drives the transmission belt to drive, the transmission belt drives the transmission wheel 2 to rotate, the transmission wheel 1 and the transmission wheel 2 respectively drive the two rotating columns to rotate, and the two rotating columns respectively drive the four arc-shaped bars to rotate. When one of the arc-shaped bars contacts the bottom of the filter screen 1, it will lift up one end of the filter screen 1, and then under the action of gravity, one end of the filter screen 1 rotates downward, so that the sand and gravel on the filter screen 1 can rise and fall during screening, and the sand and gravel will not block the filter screen 1, and large pieces of sand and gravel will stay The top of filter one will then move toward the corresponding collecting shell, and then large pieces of sand and gravel will enter the corresponding collecting shell and be collected, and other sand and gravel will be filtered by filter one and fall to the top of filter two. Through the above operation, medium-sized sand and gravel will move toward the corresponding collecting shell, and finally enter the corresponding collecting shell and be collected, and the smallest sand and gravel will be filtered by filter two and fall to the bottom of the filter shell, and then all enter the corresponding collecting shell and be collected, so that three different sizes of sand and gravel can be filtered, and the sand and gravel will not cause clogging of the filter during filtration.

[0024] In the above technical solution, further, the filter screen 1 and the filter screen 2 are both arranged at an inclination, and the bottom of the feed shell and the bottom of the inner cavity of the filter shell are both arranged at an inclination.

[0025] In this technical solution, it is ensured that the sand and gravel are displaced on the filter screen 1 and the filter screen 2, that all the sand and gravel can enter the filter shell from the bottom of the feed shell, and that all the sand and gravel at the bottom of the inner cavity of the filter shell can enter the corresponding collection shell and be collected.

[0026] In the above technical solution, further, a guide plate is fixedly installed in the filter shell and below the filter screen 1, and the guide plate is arranged at an angle.

[0027] In this technical solution, other sand and gravel will be filtered by filter screen one and fall to the top of the guide plate, and then enter the top of filter screen two along the guide plate, preventing the sand and gravel from falling directly into the corresponding collection shell.

[0028] In the above technical solution, further, the filtering accuracy of the second filter is greater than the filtering accuracy of the first filter.

[0029] In this technical solution, it is ensured that filter screen 2 can screen medium-sized sand and gravel, and filter screen 1 can screen larger sand and gravel.

[0030] The beneficial effects of the utility model are:

[0031] 1. This sand and gravel screening device, when it is necessary to screen sand and gravel, first pour the sand and gravel into the feed shell, then adjust the feeding speed according to the type of sand and gravel, through the set driving component, the sliding plate can be driven to slide, then the discharge port of the feed shell will gradually become larger, when the discharge speed is appropriate, through the set driving component, the sliding plate stops sliding, and finally the sand and gravel enter the filter shell from the discharge port of the feed shell, and the feeding speed can be adjusted according to different types of sand and gravel.

[0032] 2. The sand and gravel screening device can drive the two rotating columns to rotate through the arranged power assembly, and the two rotating columns respectively drive the four arc-shaped bars to rotate. When one of the arc-shaped bars contacts the bottom of the filter screen one, one end of the filter screen one will be lifted up, and then one end of the filter screen one will rotate downward under the action of gravity, so that the sand and gravel on the filter screen one can rise and fall during screening, and the sand and gravel will not block the filter screen one. The large pieces of sand and gravel will stay on the top of the filter screen one, and the other sand and gravel will be filtered by the filter screen one and fall to the top of the filter screen two. Then, through the above operation, the medium-sized sand and gravel will stay on the top of the filter screen two, and the smallest sand and gravel will be filtered by the filter screen two and fall to the bottom of the filter shell, so that three different sizes of sand and gravel can be filtered, and the sand and gravel will not cause the filter screen to be blocked during filtering. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0034] Figure 2 It is a schematic diagram of the sliding plate area structure of the utility model;

[0035] Figure 3 It is a schematic diagram of the cross-sectional structure of the feed shell of the utility model;

[0036] Figure 4 It is a schematic diagram of the guide plate area structure of the utility model;

[0037] Figure 5 It is a schematic diagram of the transmission belt area structure of the utility model.

[0038] The symbols in the figure are:

[0039] 1. Filter shell; 2. Feed shell; 3. Sliding groove; 4. Sliding plate; 5. Filter screen 1; 6. Filter screen 2; 7. Rotating column; 8. Arc bar; 9. Collecting shell; 10. Limiting plate; 11. Threaded rod; 12. Operating handle; 13. Motor; 14. Transmission wheel 1; 15. Transmission wheel 2; 16. Transmission belt; 17. Guide plate. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0041] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0042] Embodiment 1:

[0043] This embodiment provides a sand and gravel screening device, comprising:

[0044] A filter shell 1, a feed shell 2 is fixedly installed on the top of the filter shell 1, the discharge port of the feed shell 2 is connected to the feed port of the filter shell 1, a sliding groove 3 is opened in the feed shell 2, and a sliding plate 4 is slidably installed in the sliding groove 3;

[0045] A driving assembly, which is located in the feed shell 2 and is used to drive the sliding plate 4 to slide;

[0046] A filter screen 5 is rotatably installed in the filter housing 1. A filter screen 2 6 is rotatably installed in the filter housing 1 and below the filter screen 5. The left end of the filter screen 5 penetrates the filter housing 1 and extends to the outside. The right end of the filter screen 2 6 penetrates the filter housing 1 and extends to the outside. Two rotating columns 7 are rotatably installed in the filter housing 1. The two rotating columns 7 are respectively located at the bottom of the filter screen 1 5 and the filter screen 2 6. The circumferential side walls of the two rotating columns 7 are respectively in contact with the bottom of the filter screen 1 5 and the filter screen 2 6. The circumferential side walls of the rotating columns 7 are symmetrically fixed with arc strips 8.

[0047] A power assembly is located on the filter housing 1 and is used to drive the two rotating columns 7 to rotate simultaneously.

[0048] When the sand and gravel need to be screened, the sand and gravel are first poured into the feed shell 2, and then the feed speed is adjusted according to the type of sand and gravel. The driving assembly is provided to drive the sliding plate 4 to slide, and then the discharge port of the feed shell 2 gradually becomes larger. When the discharge speed is appropriate, the sliding plate 4 stops sliding through the driving assembly, and finally the sand and gravel enter the filter shell 1 from the discharge port of the feed shell 2.

[0049] By means of the power assembly, the two rotating columns 7 can be driven to rotate, and the two rotating columns 7 respectively drive the four arc-shaped bars 8 to rotate. When one of the arc-shaped bars 8 contacts the bottom of the filter screen 5, one end of the filter screen 5 will be lifted up, and then one end of the filter screen 5 will rotate downward under the action of gravity, so that the sand and gravel on the filter screen 5 can rise and fall during screening, and the sand and gravel will not block the filter screen 5. Large pieces of sand and gravel will stay on the top of the filter screen 5, and other sand and gravel will be filtered by the filter screen 5 and fall to the top of the filter screen 2 6. Then, through the above operation, the medium-sized sand and gravel will stay on the top of the filter screen 2 6, and the smallest sand and gravel will be filtered by the filter screen 2 6 and fall to the bottom of the filter shell 1, so that three different sizes of sand and gravel can be filtered, and the sand and gravel will not cause the filter screen to be blocked during filtering.

[0050] In this embodiment, it also includes:

[0051] Three collecting shells 9, which are respectively arranged at the left end of the filter screen 1 5, the right end of the filter screen 2 6 and the discharge port of the filter shell 1, and the three collecting shells 9 are fixedly connected to the filter shell 1, and a limit plate 10 is inserted and installed on one side of the collecting shell 9;

[0052] Among them, large pieces of sand and gravel will stay on the top of the filter mesh 5 and then move toward the corresponding collecting shell 9, and then the large pieces of sand and gravel will enter the corresponding collecting shell 9 and be collected, and other sand and gravel will be filtered by the filter mesh 5 and fall to the top of the guide plate 17, and then enter the top of the filter mesh 2 6 along the guide plate 17, and then through the above operation, the medium-sized sand and gravel will move toward the corresponding collecting shell 9, and finally the medium-sized sand and gravel will enter the corresponding collecting shell 9 and be collected, and the smallest sand and gravel will be filtered by the filter mesh 2 6, fall to the bottom of the filter shell 1, and then all enter the corresponding collecting shell 9 and be collected.

[0053] Embodiment 2:

[0054] This embodiment provides a sand and gravel screening device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0055] In this embodiment, the driving component includes:

[0056] The threaded rod 11 is rotatably mounted in the sliding groove 3 , and one end of the threaded rod 11 passes through the sliding plate 4 and the sliding groove 3 and extends to the outside and is fixedly mounted with an operating handle 12 , and the threaded rod 11 is threadedly connected to the sliding plate 4 .

[0057] Among them, when it is necessary to screen sand and gravel, first pour the sand and gravel into the feed shell 2, and then adjust the feeding speed according to the type of sand and gravel. First, turn the operating handle 12 to drive the threaded rod 11 to rotate. Under the action of the thread, the threaded rod 11 drives the sliding plate 4 to slide, and then the discharge port of the feed shell 2 will gradually become larger. When the discharge speed is appropriate, stop turning the operating handle 12, the sliding plate 4 stops sliding, and finally the sand and gravel enter the filter shell 1 from the discharge port of the feed shell 2.

[0058] Embodiment 3:

[0059] This embodiment provides a sand and gravel screening device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0060] In this embodiment, the power assembly includes:

[0061] A motor 13, the motor 13 is fixedly mounted on one side of the filter housing 1, and the motor 13 is located on one side of one of the rotating columns 7, a transmission wheel 14 is fixedly mounted on the output shaft of the motor 13, one end of the transmission wheel 14 penetrates the filter housing 1 and is coaxially connected to one of the rotating columns 7, and one end of the transmission wheel 14 is rotatably connected to the filter housing 1;

[0062] Transmission wheel 2 15 is rotatably installed on one side of the filter housing 1, and the transmission wheel 2 15 is located on one side of another rotating column 7. One end of the transmission wheel 2 15 passes through the filter housing 1 and is coaxially connected to the other rotating column 7. The transmission wheel 2 15 is located above the transmission wheel 1 14, and a transmission belt 16 is installed between the transmission wheel 2 15 and the transmission wheel 1 14.

[0063] Among them, the motor 13 is started at the same time, and the motor 13 is powered on to drive the transmission wheel 14 to rotate, the transmission wheel 14 drives the transmission belt 16 to transmit, the transmission belt 16 drives the transmission wheel 2 15 to rotate, the transmission wheel 14 and the transmission wheel 2 15 respectively drive the two rotating columns 7 to rotate, and the two rotating columns 7 respectively drive the four arc-shaped bars 8 to rotate. When one of the arc-shaped bars 8 contacts the bottom of the filter screen 5, it will lift up one end of the filter screen 5, and then under the action of gravity, one end of the filter screen 5 rotates downward, so that the sand and gravel on the filter screen 5 can rise and fall during screening, and the sand and gravel will not block the filter screen 5. Large pieces The sand and gravel will stay on the top of the filter screen 5 and then move toward the corresponding collecting shell 9. Then the large pieces of sand and gravel will enter the corresponding collecting shell 9 and be collected. The other sand and gravel will be filtered by the filter screen 5 and fall to the top of the filter screen 2 6. Through the above operation, the medium-sized sand and gravel will move toward the corresponding collecting shell 9. Finally, the medium-sized sand and gravel will enter the corresponding collecting shell 9 and be collected. The smallest sand and gravel will be filtered by the filter screen 2 6 and fall to the bottom of the filter shell 1. Then all of them will enter the corresponding collecting shell 9 and be collected. In this way, three different sizes of sand and gravel can be filtered, and the sand and gravel will not cause the filter screen to be blocked during filtration.

[0064] Embodiment 4:

[0065] This embodiment provides a sand and gravel screening device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0066] In this embodiment, the filter screen 1 5 and the filter screen 2 6 are both arranged at an inclination, and the bottom of the feed shell 2 and the bottom of the inner cavity of the filter shell 1 are both arranged at an inclination.

[0067] Among them, it is ensured that the sand and gravel are displaced on the filter screen 1 5 and the filter screen 2 6, so that all the sand and gravel can enter the filter shell 1 from the bottom of the feed shell 2, and that all the sand and gravel at the bottom of the inner cavity of the filter shell 1 can enter the corresponding collection shell 9 and be collected.

[0068] Embodiment 5:

[0069] This embodiment provides a sand and gravel screening device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0070] In this embodiment, a guide plate 17 is fixedly installed in the filter housing 1 and below the filter screen 1 5 , and the guide plate 17 is inclined.

[0071] Among them, other sand and gravel will be filtered by the filter screen 1 5 and fall to the top of the guide plate 17, and then enter the top of the filter screen 2 6 along the guide plate 17, so as to prevent the sand and gravel from falling directly into the corresponding collection shell 9.

[0072] Embodiment 6:

[0073] This embodiment provides a sand and gravel screening device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0074] In this embodiment, the filtering accuracy of the filter screen 2 6 is greater than the filtering accuracy of the filter screen 1 5 .

[0075] Among them, it is ensured that the filter screen 2 6 can screen medium sand and gravel, and that the filter screen 1 5 can screen larger sand and gravel.

[0076] Working principle: When it is necessary to screen the sand and gravel, first pour the sand and gravel into the feed shell 2, then adjust the feeding speed according to the type of sand and gravel, first turn the operating handle 12 to drive the threaded rod 11 to rotate, under the action of the thread, the threaded rod 11 drives the sliding plate 4 to slide, then the discharge port of the feed shell 2 will gradually become larger, when the discharge speed is appropriate, stop turning the operating handle 12, the sliding plate 4 stops sliding, and finally the sand and gravel enter the filter shell 1 from the discharge port of the feed shell 2;

[0077] At the same time, the motor 13 is started, and the motor 13 is powered on to drive the transmission wheel 14 to rotate, the transmission wheel 14 drives the transmission belt 16 to transmit, the transmission belt 16 drives the transmission wheel 2 15 to rotate, the transmission wheel 14 and the transmission wheel 2 15 respectively drive the two rotating columns 7 to rotate, and the two rotating columns 7 respectively drive the four arc-shaped bars 8 to rotate. When one of the arc-shaped bars 8 contacts the bottom of the filter screen 1 5, one end of the filter screen 1 5 will be lifted up, and then one end of the filter screen 1 5 will rotate downward under the action of gravity, so that the sand and gravel on the filter screen 1 5 can rise and fall during screening, and the sand and gravel will not block the filter screen 1 5. Large pieces of sand and gravel will stay on the filter screen 1 5. The top of the filter screen 1 will then move toward the corresponding collecting shell 9, and then large pieces of sand and gravel will enter the corresponding collecting shell 9 and be collected. Other sand and gravel will be filtered by the filter screen 1 5 and fall to the top of the guide plate 17, and then enter the top of the filter screen 2 6 along the guide plate 17. Through the above operation, the medium-sized sand and gravel will move toward the corresponding collecting shell 9, and finally the medium-sized sand and gravel will enter the corresponding collecting shell 9 and be collected. The smallest sand and gravel will be filtered by the filter screen 2 6 and fall to the bottom of the filter shell 1, and then all enter the corresponding collecting shell 9 and be collected, so that three different sizes of sand and gravel can be filtered, and the sand and gravel will not cause the filter screen to be blocked during filtration.

[0078] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A sand and gravel screening device, characterized in that: include: A filter shell (1), a feed shell (2) is fixedly mounted on the top of the filter shell (1), an outlet of the feed shell (2) is connected to an inlet of the filter shell (1), a sliding groove (3) is provided in the feed shell (2), and a sliding plate (4) is slidably mounted in the sliding groove (3); A driving assembly, the driving assembly is located in the feed shell (2) and is used to drive the sliding plate (4) to slide; A filter screen (5), the filter screen (5) being rotatably mounted in a filter housing (1), a filter screen (6) being rotatably mounted in the filter housing (1) and located below the filter screen (5), the left end of the filter screen (5) passing through the filter housing (1) and extending to the outside, the right end of the filter screen (6) passing through the filter housing (1) and extending to the outside, two rotating columns (7) being rotatably mounted in the filter housing (1), and the two rotating columns (7) being respectively located at the bottom of the filter screen (5) and the filter screen (6), the circumferential side walls of the two rotating columns (7) being respectively in contact with the bottom of the filter screen (5) and the filter screen (6), and arc-shaped bars (8) being symmetrically fixedly mounted on the circumferential side walls of the rotating columns (7); A power assembly is located on the filter housing (1) and is used to drive the two rotating columns (7) to rotate simultaneously.

2. A sand and gravel screening device according to claim 1, characterized in that: Also includes: Three collecting shells (9), the three collecting shells (9) are respectively arranged at the left end of the first filter screen (5), the right end of the second filter screen (6) and the outlet of the filter shell (1), the three collecting shells (9) are all fixedly connected to the filter shell (1), and a limiting plate (10) is inserted and installed on one side of the collecting shell (9).

3. A sand and gravel screening device according to claim 2, characterized in that: The drive assembly comprises: A threaded rod (11), wherein the threaded rod (11) is rotatably mounted in the sliding groove (3), and one end of the threaded rod (11) passes through the sliding plate (4) and the sliding groove (3) to extend to the outside and is fixedly mounted with an operating handle (12), and the threaded rod (11) is threadedly connected to the sliding plate (4).

4. A sand and gravel screening device according to claim 3, characterized in that: The power assembly comprises: A motor (13), the motor (13) being fixedly mounted on one side of the filter housing (1), and the motor (13) being located on one side of one of the rotating columns (7), a transmission wheel (14) being fixedly mounted on the output shaft of the motor (13), one end of the transmission wheel (14) passing through the filter housing (1) and being coaxially connected to one of the rotating columns (7), and one end of the transmission wheel (14) being rotationally connected to the filter housing (1); A second transmission wheel (15), the second transmission wheel (15) is rotatably mounted on one side of the filter housing (1), and the second transmission wheel (15) is located on one side of another rotating column (7), one end of the second transmission wheel (15) passes through the filter housing (1) and is coaxially connected to another rotating column (7), the second transmission wheel (15) is located above the first transmission wheel (14), and a transmission belt (16) is installed between the second transmission wheel (15) and the first transmission wheel (14) for transmission.

5. A sand and gravel screening device according to claim 1, characterized in that: The filter screen 1 (5) and the filter screen 2 (6) are both arranged in an inclined manner.

6. A sand and gravel screening device according to claim 1, characterized in that: The bottom of the feed shell (2) and the bottom of the inner cavity of the filter shell (1) are both arranged in an inclined manner.

7. A sand and gravel screening device according to claim 1, characterized in that: A guide plate (17) is fixedly installed in the filter housing (1) and below the filter screen 1 (5), and the guide plate (17) is arranged in an inclined manner.

8. The sand and gravel screening device according to claim 1, characterized in that: The filtering accuracy of the second filter screen (6) is greater than the filtering accuracy of the first filter screen (5).

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