Classified screening type machine-made sand processing device

Abstract

The utility model discloses a grading screening type machine-made sand processing device which comprises a working table, a bottom cover, a top cover and a crushing and grading screening synchronizing mechanism, the bottom cover is arranged at the top end of the working table, and a plurality of coaxially-arranged circular-truncated-cone-shaped supporting cylinders are arranged at the upper end, where the inner side of the bottom cover is located, of the working table; the synchronizing mechanism comprises an inverted circular-truncated-cone-shaped shell, the shell is coaxially arranged on the inner side of the supporting cylinder, and the shell is provided with a crushing unit; the crushing unit is connected with the bottom cover through the top cover, the outer wall of the shell is divided into a plurality of filtering units through a first annular framework from bottom to top, the mesh number of the filtering units is sequentially reduced from bottom to top, and a sealing plate is arranged at the bottom end of the shell; the sealing plate is rotationally connected with the top end of the workbench through a driving motor, and a plurality of annular grading filter screens are coaxially connected to the periphery of the shell from bottom to top. According to the device, the working efficiency of grading screening is improved, the production cost is saved, the occupancy rate of a construction site is reduced, the yield of machine-made sand processing is improved, and particle size mixing of finished machine-made sand particles is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of manufactured sand processing technology, specifically relating to a graded screening type manufactured sand processing device. Background Technology

[0002] Manufactured sand refers to sand produced by sand making machines and other auxiliary equipment. The finished product is more regular and can be processed into sand of different shapes and sizes according to different process requirements, better meeting daily needs. Manufactured sand requires specialized equipment to produce qualified and suitable sand and gravel, which is then classified into different particle sizes using grading and screening equipment.

[0003] Typically, the crushing and grading / screening steps for sand and gravel are separate, and the equipment used for each is different. This results in low production efficiency and a large space requirement, making it unsuitable for small and medium-sized enterprises. On the other hand, the cost of purchasing two sets of equipment is very high, and a large number of workers are also required. This cost is further spread to the price of the finished manufactured sand, which significantly reduces the competitiveness of the manufactured sand product. Utility Model Content

[0004] This utility model discloses a graded screening type manufactured sand processing device, which simultaneously realizes the crushing and grading screening processes of manufactured sand through a set of equipment, so as to improve work efficiency, save production costs, reduce the occupancy rate of construction sites, and produce high-quality manufactured sand.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A graded screening type manufactured sand processing device is characterized in that it includes a workbench, a bottom cover, a top cover, and a crushing and grading screening synchronous mechanism. The bottom cover is set above the workbench, the top cover is set above the bottom cover, and the upper part of the workbench where the inner side of the bottom cover is located is provided with several coaxially arranged frustum-shaped support cylinders.

[0007] The crushing and grading screening synchronization mechanism includes an inverted frustum-shaped shell, which is coaxially located inside the innermost support cylinder. A crushing unit is configured inside the shell. The crushing unit includes a rotating shaft located longitudinally at the central axis of the shell and several crushing elements fixed to the outer wall of the rotating shaft and evenly distributed along the axial direction of the rotating shaft. A top plate is fixed at the top of the shell, and the rotating shaft passes through the top plate and is rotatably connected to the top plate. The top cover is a cylindrical shell structure with an open bottom, and a crushing motor for driving the rotating shaft to rotate is fixedly installed at the inner top of the top cover.

[0008] The outer wall of the shell is divided into several filter units from bottom to top by a first annular skeleton, and the mesh size of the filter units decreases from bottom to top. Furthermore, multiple annular graded filter screens are coaxially connected from bottom to top on the outer periphery of the shell. The inner edge of the graded filter screen is fixedly connected to the outer wall of the shell, and the outer edge of the graded filter screen is slidably connected to the top of the corresponding support cylinder. Finished product silos for different particle sizes of sand and gravel are formed between adjacent support cylinders, between the support cylinder and the side wall of the bottom cover, and inside the innermost support cylinder.

[0009] The bottom of the housing is provided with a sealing plate, which is rotatably connected to the top of the workbench via a drive motor.

[0010] Furthermore, the top of the workbench is provided with a cylindrical motor protective shell, the drive motor is fixedly installed inside the motor protective shell, and the sealing plate is rotatably connected to the top of the motor protective shell through a thrust bearing;

[0011] The output shaft of the drive motor extends upward through the through hole at the top of the motor protective housing, passes through the inner hole of the thrust bearing, and is fixedly connected to the middle of the bottom end of the sealing plate.

[0012] Furthermore, the bottom cover is a cylindrical cover with an open bottom. The bottom end of the cylindrical cover is sealed and fixedly connected to the top end of the work platform. The top end of the bottom cover has a circular hole. The edge of the top plate extends outward to form an extension. The bottom end of the extension is coaxially provided with a first annular slider. The upper edge of the circular hole is coaxially provided with a first annular groove. The first annular slider and the first annular groove slide in a sliding fit.

[0013] Furthermore, the top plate has a feed hole, the top of the feed hole is provided with a first hopper, the top of the cover is provided with a feeding hole, the feeding hole is provided with a conveying pipe, and the top of the conveying pipe is provided with a second hopper.

[0014] Furthermore, it also includes a controller, with a photoelectric sensor installed on the inner wall of the top cover, and a detection plate that cooperates with the photoelectric sensor at the upper edge of the top plate. The controller is electrically connected to the power module, the crushing motor, the photoelectric sensor, and the drive motor through wires.

[0015] Furthermore, the cross-section of the graded filter screen is V-shaped, including a number of intersecting second annular skeletons and a second longitudinal skeleton; the bottom of the graded filter screen is integrally connected to a first annular plate, the innermost second annular skeleton of the graded filter screen is fixedly connected to the first annular skeleton corresponding to the outer wall of the shell, and one second annular skeleton on the outer side of the graded filter screen is slidably connected to the top of the corresponding support cylinder.

[0016] The top of the graded filter screen is also provided with a V-shaped annular cover plate, and the bottom of the cover plate is provided with a second annular plate. Several sand inlet holes are evenly distributed around the axis on the second annular plate, and several discharge ports are evenly distributed on the outer edge of the cover plate. The discharge ports are equipped with electric gates. The mesh size of the graded filter screen is the same as that of the corresponding filter unit.

[0017] Furthermore, a second annular groove is coaxially fixed at the top end of the support cylinder;

[0018] A second annular slider is coaxially provided at the bottom end of one of the second annular skeletons on the outer side of the graded filter screen, and the second annular groove slides in cooperation with the second annular slider.

[0019] Furthermore, the electric door includes a door panel covering the upper end of the discharge port;

[0020] An electric push rod is connected to the inner end of the door panel. The fixed end of the electric push rod is fixedly connected to the upper surface of the cover plate, and the telescopic end is fixedly connected to the inner end of the door panel. The electric push rod is electrically connected to the controller.

[0021] Furthermore, the bottom of the workbench is provided with support legs, and several discharge pipes for discharging finished manufactured sand are distributed around the axis on the workbench corresponding to the bottom of the finished product silo. The discharge pipes are equipped with solenoid valves, and the solenoid valves are electrically connected to the controller.

[0022] Furthermore, a V-shaped guide plate is provided at the bottom of the cover plate between adjacent discharge ports.

[0023] The beneficial effects of this graded screening type manufactured sand processing device are as follows:

[0024] This invention enables the simultaneous crushing and grading of manufactured sand using a single set of equipment, thereby improving work efficiency, saving production costs, reducing the occupancy rate of construction sites, and producing high-quality manufactured sand while avoiding particle size mixing in the finished manufactured sand product. Attached Figure Description

[0025] Figure 1 This is a front view structural diagram of this utility model.

[0026] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0027] Figure 3 This is a top view schematic diagram showing the structural relationship between the shell and the graded filter screen of this utility model.

[0028] Figure 4 This is a top view schematic diagram showing the structural relationship between the shell and the cover plate of the graded filter screen of this utility model.

[0029] Figure 5This is a top view of the electric door on the graded filter cover of this utility model after it has been opened.

[0030] Figure 6 This is a schematic diagram of the structure of the cover plate of this utility model, which has a V-shaped guide plate at the bottom.

[0031] Figure 7 This is a top view of the structural relationship between the shell and the support cylinder of this utility model.

[0032] The diagram shows: 1-bottom cover, 2-workbench, 3-top cover, 4-second hopper, 5-conveying pipe, 6-discharge pipe, 7-crushing motor, 8-rotating shaft, 9-crushing element, 10-first hopper, 11-photoelectric sensor, 12-detection plate, 13-top plate, 14-first annular slider, 15-circular hole, 16-stiffening rib, 17-support cylinder, 18-second annular slider, 19-electric push rod, 20-first annular frame, 21- Graded filter screen, 211-first annular plate, 212-second annular frame, 213-second longitudinal frame, 22-cover plate, 221-second annular plate, 222-sand inlet hole, 223-outlet, 224-V-shaped guide plate, 23-finished product hopper, 24-solenoid valve, 25-motor protective shell, 26-drive motor, 27-thrust bearing, 28-sealing plate, 29-shell, 291-filter unit, 292-first longitudinal frame. Detailed Implementation

[0033] The following description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

[0034] The following embodiments can be understood as representing a part of the structure or method of this utility model, or as a combination of embodiments explaining the broader structure or method of this utility model.

[0035] Example 1

[0036] Reference Figure 1 and Figure 2 This embodiment provides a graded screening type manufactured sand processing device, including a workbench 2, a bottom cover 1, a top cover 3, and a crushing and grading screening synchronization mechanism. The bottom cover 1 is located above the workbench 2, and the top cover 3 is located above the bottom cover 1. The upper end of the workbench 2, where the bottom cover 1 is located, is provided with several coaxially arranged frustum-shaped support cylinders 17. The synchronization mechanism includes an inverted frustum-shaped shell 29, which is coaxially located inside the innermost support cylinder 17. The shell 29 is equipped with a crushing unit.

[0037] The crushing unit is connected to the bottom cover 1 via the top cover 3. The outer wall of the shell 29 is divided into several filter units 291 from bottom to top by the first annular skeleton 20. The mesh size of the filter units 291 decreases from bottom to top. The bottom end of the shell 29 is provided with a sealing plate 28. The sealing plate 28 is rotatably connected to the top of the workbench 2 via a drive motor 26. Multiple annular grading screens 21 are coaxially connected to the outer periphery of the shell 29 from bottom to top. The inner edge of the grading screen 21 is fixedly connected to the outer wall of the shell 29, and the outer edge is slidably connected to the top of the corresponding support cylinder 17. The adjacent support cylinders 17, the support cylinder 17 and the side wall of the bottom cover 1, and the innermost support cylinder 17 form finished product bins 23 for sand and gravel of different particle sizes.

[0038] In addition, the top of the workbench 2 is provided with a cylindrical motor protective shell 25. The drive motor 26 is fixedly installed inside the motor protective shell 25. The sealing plate 28 is rotatably connected to the top of the motor protective shell 25 through a thrust bearing 27. The output shaft of the drive motor 26 extends upward through the through hole at the top of the motor protective shell 25, passes through the inner hole of the thrust bearing 27, and is fixedly connected to the middle of the bottom end of the sealing plate 28. A frustum-shaped slide (not marked in the figure, for guiding the filtered manufactured sand particles) is connected between the top edge of the motor protective shell 25 and the edge of the sealing plate 28. The motor protective shell 25 and the innermost support cylinder 17 sidewall form a finished product bin for accommodating the largest mesh size manufactured sand.

[0039] In this embodiment, the mesh size of several filter units 291 decreases sequentially from bottom to top. When the drive motor rotates, due to centrifugal force, the manufactured sand particles in the crushing process move upward along the inner wall of the shell. During the movement, they are filtered and screened by the filter units. In this screening step, except for the bottom filter unit, other filter units may screen out manufactured sand with a suitable particle size as well as mixed manufactured sand with a particle size smaller than the manufactured sand. These mixed manufactured sand particles are further screened by several grading filter screens and are finally intercepted by the grading filter screen with a particle size suitable for them or finally enter the finished product bin. As the crushing process is implemented, the grading and screening are carried out simultaneously, which can greatly improve the efficiency of manufactured sand preparation.

[0040] Example 2

[0041] like Figure 2 , Figure 3As shown, the shell 29 is made of steel plate. Several horizontally arranged first annular frames 20 are distributed from bottom to top on the outer wall of the shell 29. Several first longitudinal frames 292 intersecting the first annular frames 20 are evenly distributed around the axis on the outer wall of the shell 29. A filter screen structure is formed by perforation on the outer wall of the shell 29. The sealing plate and the lowermost first annular frame 20, and the adjacent first longitudinal frames 292, constitute a filter unit for filtering the largest mesh size manufactured sand. Above the filter unit, between the adjacent first annular frames 20... The uppermost first annular skeleton 20 and the top of the shell 29 form a filter unit with progressively decreasing mesh size. The top of the shell 29 is fixedly provided with a top plate 13. The bottom cover 1 is a cylindrical cover with an open bottom. The bottom end of the cylindrical cover is sealed and fixedly connected to the upper end of the working platform 2. A circular hole 15 is provided at the top. The edge of the top plate 13 extends outward to form an extension. The bottom end of the extension is coaxially provided with a first annular slider 14. The upper edge of the circular hole is coaxially provided with a first annular groove (not shown in the figure). The first annular slider 14 and the first annular groove slide in a sliding fit.

[0042] Example 3

[0043] like Figure 2 As shown, the crushing unit includes a rotating shaft 8 longitudinally located at the central axis of the housing 29 and several crushing elements 9 fixed to the outer wall of the rotating shaft 8 and evenly distributed along the axial direction of the rotating shaft 8. The rotating shaft 8 passes through the top plate 13 and is rotatably connected to the top plate 13. The top cover 3 is a cylindrical shell structure with an open lower end. A crushing motor 7 is fixedly installed at the top of the cylindrical shell structure. The output shaft of the crushing motor 7 is fixedly connected to the top end of the rotating shaft 8. The lower edge of the top cover 3 is fixedly connected to the top end of the bottom cover 1. The crushing element 9 is specifically a crushing rod used to crush the manufactured sand raw material. It can also be replaced by crushing blades or hammering. A feed hole is passed through the top plate 13. A first hopper 10 is provided at the top of the feed hole. A feeding hole is provided at the top of the top cover 3. A conveying pipe 5 passes through the feeding hole. A second hopper 4 is provided at the top end of the conveying pipe 5.

[0044] like Figure 2 As shown, it also includes a controller. The inner wall of the top cover 3 is provided with a photoelectric sensor 11, and the upper edge of the top plate 13 is provided with a detection plate 12 that cooperates with the photoelectric sensor 11. The controller is electrically connected to the power module, the crushing motor 7, the photoelectric sensor 11, and the drive motor 26 through wires.

[0045] Example 4

[0046] like Figures 2-7As shown, the cross-section of the grading filter 21 is V-shaped, including several intersecting second annular skeletons 212 and second longitudinal skeletons 213. The bottom of the grading filter 21 is integrally connected to a first annular plate 211. The innermost second annular skeleton 212 of the grading filter 21 is fixedly connected to the first annular skeleton 20 corresponding to the outer wall of the shell 29. One second annular skeleton 212 on the outer side of the grading filter 21 is slidably connected to the top of the corresponding support cylinder 17. The top of the grading filter 21 is also provided with an annular cover plate 22 with a V-shaped cross-section. The bottom of the cover plate 22 is provided with a second annular plate 221. Several sand inlet holes 222 are evenly distributed around the axis on the second annular plate 221. Several outlet ports 223 are evenly distributed on the outer edge of the cover plate 22. The outlet ports 223 are equipped with electric gates. The mesh size of the grading filter is the same as that of the corresponding filter unit (i.e., the filter unit transports the manufactured sand particles into the grading filter).

[0047] like Figure 2 As shown, the top end of the support cylinder 17 is coaxially fixed with a second annular groove, and the bottom end of a second annular skeleton 212 on the outer side of the graded filter screen 21 is coaxially provided with a second annular slider 18, and the second annular groove and the second annular slider 18 are slidably engaged.

[0048] like Figure 2 , Figure 4 As shown, the electric door includes a door panel (not marked in the figure) covering the upper end of the discharge port 223. An electric push rod 19 is connected to the inner end of the door panel. The fixed end of the electric push rod 19 is fixedly connected to the upper surface of the cover plate 22, and the telescopic end is fixedly connected to the inner end of the door panel. The electric push rod 19 is electrically connected to the controller. When telescopic, it controls the opening and closing of the discharge port.

[0049] Example 5

[0050] like Figure 1 , Figure 2 As shown, the workbench 2 has support legs at its bottom. Several discharge pipes 6 are distributed around the axis on the workbench 2 corresponding to the bottom of the finished product hopper 23, for discharging the finished manufactured sand. Each discharge pipe 6 is equipped with a solenoid valve 24 (which opens when discharging material). The solenoid valve 24 is electrically connected to the controller. Figure 6 As shown, the bottom of the cover plate 22 between adjacent discharge ports 223 is provided with a V-shaped guide plate 224. When the material is discharged through the discharge port 223, the V-shaped guide plate 224 is used to guide the manufactured sand particles to the discharge port.

[0051] Based on the apparatus of Examples 1-5 above, the manufactured sand is crushed and screened, and the steps are as follows:

[0052] (1) When the equipment is in its initial state, manufactured sand raw material is fed into the second hopper. The manufactured sand raw material enters the first hopper through the conveying pipe and then enters the shell through the feed hole. The manufactured sand raw material can be semi-finished manufactured sand or sand and gravel raw material with larger particle size.

[0053] (2) Start the crushing motor and crush the manufactured sand raw material with the crushing rod. After setting the time, start the drive motor intermittently. Under the drive motor, the shell rotates and the manufactured sand raw material being crushed is lifted by centrifugal force (on the one hand, it can achieve the filtration effect, and on the other hand, the lifted manufactured sand raw material comes into contact with the crushing rod, which improves the crushing efficiency). The manufactured sand particles that move against the inner wall of the shell are screened by filter units with different mesh sizes. The manufactured sand particles that pass through the filter unit enter the cover plate of the corresponding grading filter and enter the grading filter through the sand inlet hole on the cover plate (the purpose of setting the cover plate is to prevent the manufactured sand in the grading filter from being discharged too early, and to ensure that the qualified particle size manufactured sand enters the corresponding finished product bin after sufficient screening, and to avoid the finished manufactured sand particle size of the screened product being mixed). The manufactured sand filtered by the bottom filter unit directly enters the finished product bin one.

[0054] (3) Among the manufactured sand particles that enter the grading filter, those with a suitable particle size are retained in the grading filter, while those with a smaller particle size pass through the grading filter and enter the cover plate of the grading filter below, and then enter the corresponding grading filter through the sand inlet hole on the cover plate. This process continues until the sand is retained by the appropriate grading filter or finally enters the finished product bin. In this step, the manufactured sand in the grading filter can be quickly separated and screened by the drive motor, ensuring that the manufactured sand finished product with the required particle size is screened out.

[0055] (4) During the rotation of the shell, the grading filter screen rotates along with it. Due to inertia, the manufactured sand moves on the surface of the grading filter screen, leaving the manufactured sand with the appropriate particle size and screening out the manufactured sand with smaller particle size. As described in step (3), the manufactured sand with smaller particle size is classified into the corresponding grading filter screen or enters the finished product silo.

[0056] (5) After the first time is set, the crushing motor stops. At the same time, the discharge port is opened by the electric push rod, and the motor speed is increased (the optimal speed can be obtained by test). The matching machine sand particles in the grading filter are thrown out into the corresponding finished product bin. After that, the electric push rod extends, the discharge port is closed, the crushing motor starts, and steps (2)-(4) are repeated.

[0057] (6) After the set second time (the second time is the time when the manufactured sand in the shell is crushed), the drive motor decelerates and the crushing motor stops. When the photoelectric sensor detects the signal of the detection plate, the drive motor stops and the manufactured sand raw material is added again from the second hopper.

[0058] (7) Repeat steps (1)-(6) to complete the crushing and grading of all manufactured sand.

Claims

1. A graded screening type manufactured sand processing device, characterized in that, It includes a workbench, a bottom cover, a top cover, and a simultaneous crushing and grading screening mechanism. The bottom cover is located above the workbench, and the top cover is located above the bottom cover. Several coaxially arranged frustum-shaped support cylinders are provided on the upper part of the workbench where the inner side of the bottom cover is located. The crushing and grading screening synchronization mechanism includes an inverted frustum-shaped shell, which is coaxially located inside the innermost support cylinder. A crushing unit is configured inside the shell. The crushing unit includes a rotating shaft located longitudinally at the central axis of the shell and several crushing elements fixed to the outer wall of the rotating shaft and evenly distributed along the axial direction of the rotating shaft. A top plate is fixed at the top of the shell, and the rotating shaft passes through the top plate and is rotatably connected to the top plate. The top cover is a cylindrical shell structure with an open bottom, and a crushing motor for driving the rotating shaft to rotate is fixedly installed at the inner top of the top cover. The outer wall of the shell is divided into several filter units from bottom to top by a first annular skeleton, and the mesh size of the filter units decreases from bottom to top. Furthermore, multiple annular graded filter screens are coaxially connected from bottom to top on the outer periphery of the shell. The inner edge of the graded filter screen is fixedly connected to the outer wall of the shell, and the outer edge of the graded filter screen is slidably connected to the top of the corresponding support cylinder. Finished product silos for different particle sizes of sand and gravel are formed between adjacent support cylinders, between the support cylinder and the side wall of the bottom cover, and inside the innermost support cylinder. The bottom of the housing is provided with a sealing plate, which is rotatably connected to the top of the worktable via a drive motor.

2. The graded screening type manufactured sand processing device according to claim 1, characterized in that, The top of the workbench is provided with a cylindrical motor protective shell, the drive motor is fixedly installed inside the motor protective shell, and the sealing plate is rotatably connected to the top of the motor protective shell through a thrust bearing. The output shaft of the drive motor extends upward through the through hole at the top of the motor protective housing, passes through the inner hole of the thrust bearing, and is fixedly connected to the middle of the bottom end of the sealing plate.

3. The graded screening type manufactured sand processing device according to claim 1, characterized in that, The bottom cover is a cylindrical cover with an open bottom. The bottom end of the cylindrical cover is sealed and fixedly connected to the top end of the work platform. The top end of the bottom cover has a circular hole. The edge of the top plate extends outward to form an extension. The bottom end of the extension is coaxially provided with a first annular slider. The upper edge of the circular hole is coaxially provided with a first annular groove. The first annular slider and the first annular groove slide in a sliding fit.

4. The graded screening type manufactured sand processing device according to claim 1, characterized in that, The top plate has a feed hole, the top of which is provided with a first hopper. The top of the cover is provided with a feeding hole, through which a conveying pipe is connected. The top of the conveying pipe is provided with a second hopper.

5. The graded screening type manufactured sand processing device according to claim 1, characterized in that, It also includes a controller, with a photoelectric sensor installed on the inner wall of the top cover, and a detection plate that cooperates with the photoelectric sensor at the upper edge of the top plate. The controller is electrically connected to the power module, the crushing motor, the photoelectric sensor, and the drive motor through wires.

6. The graded screening type manufactured sand processing device according to claim 5, characterized in that, The cross-section of the graded filter screen is V-shaped, including several intersecting second annular skeletons and a second longitudinal skeleton; the bottom of the graded filter screen is integrally connected to a first annular plate, the innermost second annular skeleton of the graded filter screen is fixedly connected to the first annular skeleton corresponding to the outer wall of the shell, and one second annular skeleton on the outer side of the graded filter screen is slidably connected to the top of the corresponding support cylinder. The top of the graded filter screen is also provided with a V-shaped annular cover plate, and the bottom of the cover plate is provided with a second annular plate. Several sand inlet holes are evenly distributed around the axis on the second annular plate, and several discharge ports are evenly distributed on the outer edge of the cover plate. The discharge ports are equipped with electric gates. The mesh size of the graded filter screen is the same as that of the corresponding filter unit.

7. The graded screening type manufactured sand processing device according to claim 6, characterized in that, The top end of the support cylinder is coaxially fixed with a second annular groove. A second annular slider is coaxially provided at the bottom end of one of the second annular skeletons on the outer side of the graded filter screen, and the second annular groove slides in cooperation with the second annular slider.

8. The graded screening type manufactured sand processing device according to claim 6, characterized in that, The electric door includes a door panel covering the upper end of the discharge port; An electric push rod is connected to the inner end of the door panel. The fixed end of the electric push rod is fixedly connected to the upper surface of the cover plate, and the telescopic end is fixedly connected to the inner end of the door panel. The electric push rod is electrically connected to the controller.

9. The graded screening type manufactured sand processing device according to claim 5, characterized in that, The bottom of the workbench is equipped with support legs. Several discharge pipes for discharging finished manufactured sand are distributed around the axis on the workbench corresponding to the bottom of the finished product silo. The discharge pipes are equipped with solenoid valves, which are electrically connected to the controller.

10. The graded screening type manufactured sand processing device according to claim 6, characterized in that, The bottom of the cover between adjacent discharge ports is equipped with a V-shaped guide plate.

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