Washing sand impurity removal device

Abstract

The utility model belongs to the technical field of washed sand, and discloses a washed sand impurity removal device which comprises a rack and a screening assembly arranged on the rack, and the screening assembly comprises a screening drum arranged on the rack; the number of the first screen meshes is two, the first screen meshes are symmetrically arranged, the first screen meshes are arranged on the screen drum, the first screen meshes are connected with springs, and the free ends of the springs are fixedly connected with the screen drum; the number of the second screen meshes is two, the second screen meshes are arranged on the screen drum, the second screen meshes are arranged in the first screen meshes, and the outer walls of the second screen meshes are matched with the inner walls of the first screen meshes; the driving unit is used for driving the two second screens to move relatively; according to the scheme, through movement cooperation of the first screen and the second screen, the screen holes of the first screen and the screen holes of the second screen are staggered, and therefore the hole diameter of the first screen and the hole diameter of the second screen are adjusted; the adjustable screening machine solves the problem that the aperture of a screen of an existing screening machine cannot be adjusted.

Description

Technical Field

[0001] This solution belongs to the technical field of washed sand, and specifically relates to a device for removing impurities from washed sand. Background Art

[0002] When recycling construction waste, large pieces of wood in the construction waste are first removed, and then concrete blocks are screened out from the construction waste. After the concrete blocks are broken and screened, since the location where the concrete blocks are stored contains a large amount of mud, it will cause more mud to adhere to the surface of the sand, and the screening cannot separate the mud from the sand. Therefore, it is necessary to wash the sand to remove the mud to obtain clean washed sand. The clean washed sand can be reused in the construction industry as a building material.

[0003] During the processing of washed sand, it is necessary to screen and remove impurities to separate large-grained sand and stones, impurities, and parts that do not meet the particle size requirements in the sand. Screening and impurity removal can ensure the uniform particle size of the washed sand, improve the purity and quality of the sand, and make it more meet the requirements of the construction industry for the performance of sand materials.

[0004] Referring to the literature with the existing publication (announcement) number CN112535910A, it discloses an outer axial strip screen cylinder, which includes single-piece outer screens arranged in upper and lower layers. Each single-piece outer screen in each layer of single-piece outer screens is arranged around the axis of the outer axial strip screen cylinder. The single-piece outer screen includes screen bars, and the length direction of the screen bars is parallel to the axis of the outer axial strip screen cylinder. At the top and bottom outside the screen bars of the single-piece outer screen, a top connecting plate and a bottom connecting plate are respectively provided, and connecting rod holes are provided on the top connecting plate and the bottom connecting plate. A support plate is provided between the outside of the screen bars, the top connecting plate and the bottom connecting plate. The outer axial strip screen cylinder is provided with a connecting rod, and the connecting rod passes through from the top to the bottom of the outer axial strip screen cylinder and through the coaxially arranged connecting rod holes up and down.

[0005] For example, in the above screening device, since the aperture of the screen cylinder is fixed, it can only screen out sand and stones of a specific size, and cannot adapt to raw materials of different particle sizes. Some sand and stones that do not meet the requirements cannot be screened out, thus affecting the quality of the sand. Secondly, different construction projects have different requirements for the particle size of washed sand, and the screen cylinder with a fixed aperture cannot meet the requirements of screening different particle sizes. Utility Model Content

[0006] The purpose of this solution is to provide a device for removing impurities from washed sand to solve the problem that the screen aperture of the existing screening machine cannot be adjusted.

[0007] To achieve the above purpose, this solution provides a device for removing impurities from washed sand, including a frame and a screening component arranged on the frame. The screening component includes:

[0008] A screen cylinder, which is arranged on the frame;

[0009] The first sieve, the number of the first sieves is two which are symmetrically arranged. The first sieves are arranged on the sieve cylinder, and the first sieves are connected with springs. The free ends of the springs are fixedly connected with the sieve cylinder;

[0010] The second sieve, the number of the second sieves is two which are symmetrically arranged. The second sieves are arranged on the sieve cylinder, the second sieves are arranged inside the first sieves, and the outer wall of the second sieve is arranged in cooperation with the inner wall of the first sieve;

[0011] The driving unit is used to drive the two second sieves to move relative to each other.

[0012] The principle and effect of this solution are as follows: In the initial state, the first sieve is pulled by the external force of the second sieve, and the spring is in a compressed state. After the first sieve and the second sieve are filled with washed sand, the driving unit drives the two second sieves to move relative to each other. The second sieve moves towards the center of the sieve cylinder. Under the action of the spring pre-tightening force, the first sieve moves towards the center of the sieve cylinder, so that the outer wall of the second sieve overlaps with the inner wall of the first sieve, so that the sieve holes of the first sieve and the sieve holes of the second sieve are staggered, thereby adjusting the aperture of the sieve holes. Finally, through the rotation and screening of the sieve cylinder, the processing requirements for sand materials with different impurity contents or particle sizes are realized.

[0013] Furthermore, both the first sieve and the second sieve are sieves with an arc-shaped structure, and both the first sieve and the second sieve are flexible sieves; the arc-shaped concave surface of the first sieve faces the central axis of the sieve cylinder, the second sieve is nested inside the arc-shaped concave surface of the first sieve, and the sieve holes of the second sieve are arranged in cooperation with the sieve holes of the first sieve.

[0014] The principle and effect of this solution are as follows: (1) By designing the first sieve and the second sieve as flexible arc-shaped structures and nesting and cooperating, and using the arc-shaped concave surface facing the axis of the sieve cylinder, the sand material is evenly dispersed along the arc-shaped sieve surface under the action of centrifugal force during the rotation of the sieve cylinder, reducing local accumulation; the flexible characteristics allow the two sieves to synchronously generate elastic deformation when sliding relative to each other under the action of the driving unit, so that the outer wall of the second sieve can fit with the inner wall of the first sieve, thereby adjusting the aperture of the sieve holes. (2) Water is needed to wash the sand during the washing process of the washed sand, but the washing will also cause a high water content in the sand, resulting in the sand being easily adhered to the sieve during the screening and impurity removal stage, making it difficult to screen. When the second sieve and the first sieve move towards the center of the sieve cylinder in this solution, the chamber formed by the second sieve and the first sieve will decrease. By squeezing the washed sand in the inner chamber by the second sieve and the first sieve, a large part of the water in the washed sand is squeezed out, and then a small part of the water is removed by drying, thus solving the problem of difficult screening and impurity removal caused by the high water content of the washed sand.

[0015] Further, the first screen and the second screen are flexible metal meshes. In their natural state, the first screen and the second screen are straight-line structured meshes, and they become arc-structured meshes under external force.

[0016] The principle and effect of this solution are as follows: Utilizing the elastic characteristics of the flexible metal mesh, the first screen and the second screen, which are straight-line shaped in their natural state, are bent into an arc structure under external force during installation and nested inside the screen cylinder. Subsequently, under the drive of the drive unit, the first screen and the second screen move, causing the first screen and the second screen to gradually return to their original positions (but still in an arc shape), thereby enabling the first screen and the second screen to squeeze the washed sand in the internal chamber.

[0017] Further, the aperture of the screen holes of the first screen and the second screen is 1 - 5 mm; and the screen holes of the first screen and the second screen are staggered.

[0018] The principle and effect of this solution are as follows: The design with a screen hole aperture of 1 - 5 mm can effectively screen out the washed sand with a particle size within this range, meeting the screening requirements for different particle size requirements. The staggered distribution of the screen holes can change the aperture of the screen holes and adjust the particle size of the screened washed sand.

[0019] Further, the side wall of the screen cylinder is provided with sliding grooves for guiding the movement of the first screen and the second screen, and the first screen and the second screen are respectively slidably connected to the sliding grooves.

[0020] The principle and effect of this solution are as follows: The sliding grooves are used to provide positioning and guiding functions for the movement of the first screen and the second screen, preventing them from being displaced.

[0021] Further, the first screen is provided with a clamping groove, and the end of the second screen is provided with a buckle that cooperates with the clamping groove.

[0022] The principle and effect of this solution are as follows: When the first screen and the second screen return to their initial positions after discharging, the buckle of the second screen will be fastened in the clamping groove of the first screen, providing stable connection and positioning.

[0023] Further, the screen cylinder is connected with a hot air blower through a pipeline; the screen cylinder is connected with a vacuum pump through a pipeline; the screen cylinder is provided with a water outlet.

[0024] The principle and effect of this solution are as follows: The hot air blower provides hot air for drying the washed sand to remove the moisture in it, facilitating screening and impurity removal; the vacuum pump generates negative pressure to help suck out the excess moisture and improve the drying efficiency. The water outlet is used to discharge the sucked-out moisture.

[0025] Further, the drive unit is a hydraulic cylinder. The cylinder body of the hydraulic cylinder is fixedly connected to the inner wall of the screen cylinder, and the piston rod of the hydraulic cylinder is fixedly connected to the second screen.

[0026] The principle and effect of this solution are as follows: The piston rod of the hydraulic cylinder drives the second screen to move, thereby adjusting the sieve holes and the washed sand in the extrusion chamber.

[0027] Further, the driving unit includes a cylinder and a piston. The cylinder is a cylinder with an opening at the top. The piston is slidably arranged in the cylinder and encloses a sealed chamber with the inner wall of the cylinder. The piston is connected with a driving rod, and the free end of the driving rod is hinged to the second screen.

[0028] The principle and effect of this solution are as follows: After the vacuum pump is started, the inside of the sieve cylinder is first pumped to a negative pressure state to facilitate the discharge of the internal moisture of the washed sand. When the negative pressure in the sieve cylinder is adjusted to the threshold value, the piston moves towards the opening at the top of the cylinder, driving the driving rod to extend, and driving the second screen to move towards the center of the sieve cylinder through the driving rod, thereby adjusting the sieve holes and the washed sand in the extrusion chamber.

[0029] Further, a limiting groove is formed in the cylinder, and the driving rod is slidably connected with the limiting groove; the length of the driving rod is not less than the length of the sliding groove.

[0030] The principle and effect of this solution are as follows: The limiting groove is used to provide positioning and guiding functions for the movement of the driving rod; the length of the driving rod is not less than the length of the sliding groove, so that the second screen can move to the extreme position, so as to cooperate with the first screen to extrude the washed sand in the extrusion chamber. Description of the Drawings

[0031] Figure 1 is a structural schematic diagram of a washed sand impurity removal device of the present utility model Figure 1 ;

[0032] Figure 2 is a structural schematic diagram of a washed sand impurity removal device of the present utility model Figure 2 ;

[0033] Figure 3 is an internal structural schematic diagram of the screening component of the present utility model;

[0034] Figure 4 is a structural schematic diagram of the first screen and the second screen of the present utility model.

[0035] The names of the corresponding marks in the drawings are: frame 1, screening component 2, sieve cylinder 21, cavity 211, sliding groove 212, first screen 22, second screen 23, cylinder 24, piston 25, sealed chamber 26, driving rod 27, spring 28, sieve hole 29, feed port 3, discharge port 4, driving component 5. Detailed Description of the Invention

[0036] The following will clearly and completely describe the concept and technical effects of the present utility model in combination with embodiments to fully understand the purpose, features, and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts all fall within the scope of protection of the present utility model:

[0037] Embodiment:

[0038] Please refer to Figures 1 - 4 , a water-washed sand impurity removal device, including a frame 1, on which a screening assembly 2 is provided. The screening assembly 2 includes a sieve cylinder 21, a first sieve mesh 22, a second sieve mesh 23, and a driving unit for driving the two second sieve meshes 23 to move relative to each other. As Figure 1 and Figure 2 shown, the sieve cylinder 21 is provided on the frame 1. The sieve cylinder 21 is of a cylindrical structure and is hollow inside. A driving assembly 5 for driving the sieve cylinder 21 to rotate circumferentially is provided on the frame 1. The driving assembly 5 is a prior art. For example, a toothed ring can be inserted through the outer wall of the sieve cylinder 21, a motor is provided on the frame 1, the output end of the motor is coaxially and fixedly connected with a gear, and the gear meshes with the toothed ring, so that the motor drives the sieve cylinder 21 to rotate. Feed ports 3 and discharge ports 4 are respectively provided at both ends of the sieve cylinder 21.

[0039] Both the first sieve mesh 22 and the second sieve mesh 23 are provided inside the sieve cylinder 21, and there is a cavity 211 between the first sieve mesh 22, the second sieve mesh 23 and the sieve cylinder 21 for receiving the water-washed sand with a qualified particle size screened out by the first sieve mesh 22 and the second sieve mesh 23. Four groups of sliding grooves 212 for guiding the movement of the first sieve mesh 22 and the second sieve mesh 23 are provided on the side wall of the sieve cylinder 21. The first sieve mesh 22 and the second sieve mesh 23 are respectively slidably connected to the sliding grooves 212. The length of the sliding grooves 212 is as Figure 3As shown, the number of the first screen meshes 22 is two, which are symmetrically arranged up and down. The two first screen meshes 22 are respectively slidably connected to the two chutes 212 arranged up and down. The first screen mesh 22 is connected with a spring 28, and the free end of the spring 28 is fixedly connected to the screen cylinder 21, so that the spring 28 is in a compressed state under the initial position of the first screen mesh 22; the number of the second screen meshes 23 is two, which are symmetrically arranged left and right. The two second screen meshes 23 are respectively slidably connected to the two chutes 212 arranged left and right. The second screen mesh 23 is arranged inside the first screen mesh 22, and the outer wall of the second screen mesh 23 is arranged in cooperation with the inner wall of the first screen mesh 22. Both the first screen mesh 22 and the second screen mesh 23 are flexible metal meshes (such as stainless steel woven meshes), which are linear in the natural state and are bent into an arc structure under external force during installation. The arc concave surface of the first screen mesh 22 faces the central axis of the screen cylinder 21. The second screen mesh 23 is nested inside the arc concave surface of the first screen mesh 22. The second screen mesh 23 is arranged in cooperation with the screen holes 29 of the first screen mesh 22. The aperture of the screen holes 29 of the first screen mesh 22 and the second screen mesh 23 is 1-5 mm; and the screen holes 29 of the first screen mesh 22 and the second screen mesh 23 are staggered. The arc structures of the first screen mesh 22 and the second screen mesh 23 satisfy the following parameters: the radius of curvature R 1 of the first screen mesh 22 is 300-1500 mm, and the central angle α 1 is 60°-180°; the radius of curvature R 2 of the second screen mesh 23 is R 1 ±50 mm, and the central angle α 2 is α 1 ±20°. The aperture of the screen holes 29 of the first screen mesh 22 and the second screen mesh 23 is 1-5 mm, which can effectively screen out the washed sand with particle sizes in this range and meet the screening requirements for different particle size requirements; and the screen holes 29 of the first screen mesh 22 and the second screen mesh 23 are staggered, which can change the aperture of the screen holes and adjust the particle size of the screened washed sand; the first screen mesh 22 is provided with a card slot, and the end of the second screen mesh 23 is provided with a buckle that matches the card slot. When the first screen mesh 22 and the second screen mesh 23 are reset to the initial position after discharging, the buckle of the second screen mesh 23 will be buckled in the card slot of the first screen mesh 22 to provide stable connection and positioning.

[0040] Specific working principle: In the initial state, the first screen mesh 22 is pulled by the external force of the second screen mesh 23, and the spring 28 is in a compressed state. After the washed sand is put into the first screen mesh 22 and the second screen mesh 23, the driving unit drives the two second screen meshes 23 to move relatively. The second screen mesh 23 moves towards the center of the screen cylinder 21. Under the action of the pre-tightening force of the spring 28, the first screen mesh 22 moves towards the center of the screen cylinder 21, so that the outer wall of the second screen mesh 23 overlaps with the inner wall of the first screen mesh 22, and the outer wall of the second screen mesh 23 can be in close contact with the inner wall of the first screen mesh 22, so that the screen holes 29 of the first screen mesh 22 are staggered with the screen holes 29 of the second screen mesh 23 (such as Figure 4As shown in the figure), the aperture of the sieve holes 29 is adjusted accordingly, and then the driving assembly 5 drives the sieve cylinder 21 to rotate and screen, so as to meet the processing requirements of sand materials with different impurity contents or particle sizes. At the same time, when the second sieve mesh 23 and the first sieve mesh 22 move towards the center of the sieve cylinder 21, the chamber formed by the enclosure of the second sieve mesh 23 and the first sieve mesh 22 will decrease. By squeezing the washed sand in the inner chamber by the second sieve mesh 23 and the first sieve mesh 22, a large part of the water in the washed sand can be squeezed out, and then a small part of the water is removed by drying, thus solving the problem of difficult screening and impurity removal caused by high water content of the washed sand.

[0041] The sieve cylinder 21 is connected with a hot air blower through a pipeline to provide hot air for drying the washed sand; the sieve cylinder 21 is connected with a vacuum pump through a pipeline, and the vacuum pump generates negative pressure to help suck out the excess water and improve the drying efficiency; the sieve cylinder 21 is provided with a water outlet, and the water outlet is connected with a drain pipe. The hot air blower and the vacuum pump are both prior arts and are not shown in the figure. Only a solenoid valve can be provided on the drain pipe. After draining the sieve cylinder 21, by closing the solenoid valve and then introducing hot air into the sieve cylinder 21, the inside of the sieve cylinder 21 is in a heat preservation state, and the washed sand inside is continuously dried.

[0042] The driving unit is a hydraulic cylinder. The cylinder body of the hydraulic cylinder is fixedly connected to the inner wall of the sieve cylinder 21, and the piston rod of the hydraulic cylinder is fixedly connected to the second sieve mesh 23. The hydraulic cylinder is a prior art. The piston rod of the hydraulic cylinder is used to drive the second sieve mesh 23 to move, so as to adjust the sieve holes and squeeze the washed sand in the chamber.

[0043] The driving unit is preferably a cylinder 24 and a piston 25. The cylinder 24 is a cylinder 24 with an opening at the top. The piston 25 slides in the cylinder 24 and encloses a sealed chamber 26 with the inner wall of the cylinder 24 (in a negative pressure state, the space of the sealed chamber 26 increases). The piston 25 is connected with a driving rod 27. A limiting groove is formed in the cylinder 24, and the driving rod 27 is slidably connected with the limiting groove. The free end of the driving rod 27 is hinged to the second sieve mesh 23. The length of the driving rod 27 is not less than the length of the sliding groove 212, so that the second sieve mesh 23 can move to the extreme position, so as to cooperate with the first sieve mesh 22 to squeeze the washed sand in the chamber.

[0044] Specific working principle: After putting the washed sand into the first sieve mesh 22 and the second sieve mesh 23, after the vacuum pump, the inside of the sieve cylinder 21 is first pumped to a negative pressure state. When the pressure is adjusted to the threshold value, the piston 25 moves towards the opening at the top of the cylinder 24, driving the driving rod 27 to extend. The second sieve mesh 23 is driven to move towards the center of the sieve cylinder 21 by the driving rod 27. The two first sieve meshes 22 move downwards and upwards towards the center of the sieve cylinder 21 respectively, so that the outer wall of the second sieve mesh 23 overlaps with the inner wall of the first sieve mesh 22, and the outer wall of the second sieve mesh 23 can be mutually attached to the inner wall of the first sieve mesh 22, so that the sieve holes 29 of the first sieve mesh 22 and the sieve holes 29 of the second sieve mesh 23 are staggered (asFigure 4 As shown in the figure), the aperture of the sieve hole 29 and the washed sand in the extrusion chamber are adjusted. After squeezing most (70%) of the water into the cavity 211 in the sieve cylinder 21, the solenoid valve is opened to drain the water in the cavity 211, and then the solenoid valve is closed to make the inside of the sieve cylinder 21 in a sealed state. Subsequently, a hot air blower injects hot air at 60 - 80 °C into the sieve cylinder 21 through a pipeline to further dry the sand material, and a vacuum pump continuously sucks the moisture to accelerate drying. Thus, not only the washed sand is screened and impurities are removed, but also the washed sand is dried, which is convenient for subsequent packaging, bagging and transportation.

[0045] The above are only the embodiments of the present invention. Common knowledge such as specific structures and characteristics known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A water-washed sand impurity removal device, comprising a frame (1) and a screening assembly (2) arranged on the frame (1), characterized in that: The screening assembly (2) comprises: A sieve drum (21), wherein the sieve drum (21) is arranged on the frame (1); a first screen (22), wherein the number of the first screens (22) is two and the first screens (22) are symmetrically arranged, the first screens (22) are arranged on the screen drum (21), the first screen (22) is connected to a spring (28), and the free end of the spring (28) is fixedly connected to the screen drum (21); a second screen (23), wherein the number of the second screens (23) is two and they are symmetrically arranged, the second screen (23) is arranged on the screen cylinder (21), the second screen (23) is arranged inside the first screen (22), and the outer wall of the second screen (23) is arranged in coordination with the inner wall of the first screen (22); A driving unit is used to drive the two second screens (23) to move relative to each other.

2. A sand washing and impurity removal device according to claim 1, characterized in that: The first screen (22) and the second screen (23) are both screens with an arc-shaped structure, and both the first screen (22) and the second screen (23) are flexible screens; the arc-shaped concave surface of the first screen (22) faces the central axis of the screen drum (21), the second screen (23) is nested inside the arc-shaped concave surface of the first screen (22), and the second screen (23) is arranged in coordination with the screen hole (29) of the first screen (22).

3. A sand washing and impurity removal device according to claim 2, characterized in that: The first screen (22) and the second screen (23) are flexible metal screens; the first screen (22) and the second screen (23) are screens with a linear structure in their natural state, and become screens with an arc structure when subjected to external force.

4. A sand washing and impurity removal device according to claim 2, characterized in that: The sieve holes (29) of the first sieve (22) and the second sieve (23) have a hole diameter of 1-5 mm; and the sieve holes (29) of the first sieve (22) and the second sieve (23) are arranged in a staggered manner.

5. A sand washing and impurity removal device according to claim 2, characterized in that: The side wall of the screen drum (21) is provided with a slide groove (212) for guiding the movement of the first screen (22) and the second screen (23); the first screen (22) and the second screen (23) are respectively slidably connected to the slide groove (212).

6. A sand washing and impurity removal device according to claim 2, characterized in that: The first screen (22) is provided with a slot, and the end of the second screen (23) is provided with a buckle that matches the slot.

7. The water-washed sand impurity removal device according to claim 1 is characterized in that: The sieve drum (21) is connected to a hot air blower via a pipeline; the sieve drum (21) is connected to a vacuum pump via a pipeline; and the sieve drum (21) is connected to a drainage pipe.

8. A sand washing and impurity removal device according to claim 7, characterized in that: The driving unit is a hydraulic cylinder, the cylinder body of the hydraulic cylinder is fixedly connected to the inner wall of the screen drum (21), and the piston rod of the hydraulic cylinder is fixedly connected to the second screen (23).

9. A sand washing and impurity removal device according to claim 7, characterized in that: The driving unit comprises a cylinder (24) and a piston (25); the cylinder (24) is a cylinder (24) having an opening at the top; the piston (25) is slidably disposed in the cylinder (24) and is enclosed with the inner wall of the cylinder (24) to form a sealed chamber (26); the piston (25) is connected to a driving rod (27); a free end of the driving rod (27) is hinged to the second screen (23).

10. A sand washing and impurity removal device according to claim 9, characterized in that: A limiting groove is provided in the cylinder (24), and the driving rod (27) is slidably connected to the limiting groove; the length of the driving rod (27) is not less than the length of the sliding groove (212).

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