Multistage screen for sand plant wastewater treatment

Abstract

The utility model discloses a multistage screen cloth for sandstone factory wastewater treatment belongs to multistage screen cloth technical field, solves the problem that the present technology cannot separate the filtered impurity in time, thereby easily causes screen cloth to be blocked, and the filtering efficiency is low, and the maintenance cost is high. Including the casing of top and bottom opening, the coarse filter screen, the middle filter screen and the fine filter screen are set up on the casing from top to bottom and are inclined, the coarse recovery groove and the middle recovery groove that set up on the low end one side of coarse filter screen and middle filter screen and carry out the recovery of the coarse impurity and the middle impurity that coarse filter screen and middle filter screen filter, are located in the low end one side of fine filter screen, and the casing forms the groove body of top opening with fine filter screen. The utility model is used for sandstone factory wastewater treatment multistage filtration.

Description

TECHNICAL FIELD

[0001] The utility model relates to a multistage screen for sandstone factory wastewater treatment, which is used for multistage filtration of sandstone factory wastewater treatment and belongs to the technical field of multistage screens. BACKGROUND

[0002] The sandstone factory wastewater mainly comes from the washing wastewater in the sandstone processing process and has the characteristics of high sand content, high solid suspended substance (SS), high stone powder content and strong hydrophobicity. The coarse particle sludge, stone powder and viscous substances in the wastewater can easily cause sludge accumulation in the sedimentation tank and pipeline blockage, affecting the treatment efficiency and system stability. In the prior art, multistage screens are widely used in wastewater treatment as core filtration units for separating solid impurities.

[0003] The multistage screen realizes solid-liquid separation through the step-by-step filtration of screen layers with different pore sizes in combination with sedimentation, centrifugation or dosing processes. CN202010490366.7 discloses a multistage filtration device for wastewater treatment, which comprises a bottom plate, a first treatment box, a second treatment box connected to one side of the bottom end of the first treatment box through a first conduit, a first end cover fixedly connected to the upper end of the second treatment box, a stirring mechanism connected to the upper end of the first end cover, a dosing mechanism connected to the upper end of the first end cover, a third treatment box connected to the bottom end of one side of the second treatment box through a second conduit, a second control valve connected to the second conduit, a water filtering mechanism connected in the third treatment box, a second end cover fixedly connected to the upper end of the third treatment box, a water pump connected to the upper end of the second end cover, and a first connecting pipe connected to the bottom end of the third treatment box. After the harmful substances in the wastewater are precipitated by mixing the medicine with water and stirring by the stirring mechanism, the filtered water is treated by the water filtering mechanism, and the precipitates in the filtered water are removed through multiple layers of filtration and sedimentation, thereby improving the effect of wastewater treatment. The pore sizes of the first filter screen and the second filter screen are gradually reduced to improve the filtration precision. However, the following technical problems exist: The filtered impurities cannot be separated out in time, which can easily cause screen blockage, low filtration efficiency and high maintenance cost. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a multistage screen for sandstone factory wastewater treatment, which solves the problem of the prior art that the filtered impurities cannot be separated out in time, which can easily cause screen blockage, low filtration efficiency and high maintenance cost.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of: A kind of sandstone factory wastewater treatment with multistage screen, including top and bottom opening shell, coarse filter screen, middle filter screen and fine filter screen being arranged from top to bottom in the shell, coarse recovery tank and middle recovery tank being arranged on the low end side of coarse filter screen and middle filter screen, and the coarse impurities and middle impurities filtered by coarse filter screen and middle filter screen are recycled, slot body being formed by the shell and fine filter screen on the low end side of fine filter screen.

[0006] Further, the inclination direction of the coarse filter screen and the middle filter screen is the same, and the inclination direction of the fine filter screen is opposite to that of the coarse filter screen and the middle filter screen.

[0007] Further, the inclination angle of the coarse filter screen, the middle filter screen and the fine filter screen is 5°-15°.

[0008] Further, a U-shaped baffle is arranged on the high end side of the coarse filter screen.

[0009] Further, H-shaped supports are respectively arranged on the low end side of the middle filter screen and the high end side of the fine filter screen, the H-shaped support includes a vertical rod arranged oppositely, a horizontal rod connected to the vertical rod, one vertical rod of the H-shaped support on the middle filter screen is connected to the low end bottom side of the coarse filter screen, one vertical rod of the H-shaped support on the fine filter screen is connected to the low end bottom side of the middle filter screen, and the coarse recovery tank and the middle recovery tank are respectively arranged on the H-shaped supports on the middle filter screen and the fine filter screen.

[0010] Further, a reinforcing rod connected to the shell is arranged on the bottom side of the coarse filter screen, the middle filter screen and the fine filter screen.

[0011] Further, the shell is a non-porous shell or a porous shell with mesh holes not larger than those on the fine filter screen. The U-shaped baffle is a non-porous U-shaped baffle or a porous U-shaped baffle with mesh holes not larger than those on the fine filter screen.

[0012] Further, a hanging ring is arranged on the coarse recovery tank and the middle recovery tank on one side of the H-shaped support.

[0013] Further, the height of the shell forming the slot body is not higher than the height of the middle filter screen. The top surface of the shell adjacent to the H-shaped support is located at the same horizontal plane as the top surface of the corresponding coarse recovery tank and middle recovery tank.

[0014] Further, mesh holes are arranged on the coarse recovery tank and the middle recovery tank, and the size of the mesh holes is the same as that of the mesh holes on the coarse filter screen and the middle filter screen.

[0015] Compared with the prior art, the advantages of the present application are: The utility model discloses a filter device, which comprises a shell, a coarse filter screen, a middle filter screen and a fine filter screen, and a U-shaped baffle. The utility model discloses the inclination direction of fine filter screen with coarse filter screen and middle filter screen is opposite, and the purpose is convenient for the wastewater to directly fall into the low end of fine filter screen through coarse filter screen and middle filter screen, and the impurities after fine filtering are discharged, and the impurities after fine filtering are gathered in the low end, which is easy to clean and effectively avoids the problem that the fine impurities are attached to the high end and are not easy to be cleaned. The utility model discloses the inclination angle of coarse filter screen, middle filter screen and fine filter screen, and the purpose is to avoid the problem that the angle is too small and the impurities after filtering are not easy to be gathered in the low end, and the problem that the angle is too large and the height space demand is large to meet the length demand of filtering. The utility model discloses the U-shaped baffle on the shell, and the purpose is to facilitate the wastewater to enter and hit on the U-shaped baffle, realize that the wastewater is filtered from the high end of coarse filter screen, and the impurities after filtering are gathered to the low end through the reverse impact force or the force of flowing to the low of the wastewater, and the impurities after filtering are gathered to the low end through the vibration force of the wastewater falling through coarse filter screen and the force of flowing to the low of the wastewater, which effectively avoids the problem of hole blockage. The utility model discloses the H-shaped support that fixes coarse recovery groove and middle recovery groove in the low end of coarse filter screen and middle filter screen, which facilitates the recovery of corresponding impurities and the quick removal for recovery. The utility model discloses the reinforcing rod on the bottom side of coarse filter screen, middle filter screen and fine filter screen, and the purpose is to facilitate the increase of the strength of each filter screen. The utility model discloses the holeless and the hole on the shell and the U-shaped baffle, and the purpose is to facilitate the selection of the applicable according to the filtering demand, and in the case of the hole, the wastewater after filtering is quickly discharged from the periphery, and the impurities are also filtered on the corresponding filter screen layer by layer. The utility model discloses the hanging ring on coarse recovery groove and middle recovery groove, and the purpose is to facilitate the removal of coarse recovery groove and middle recovery groove and the cleaning. The utility model discloses the height of shell in groove, coarse recovery groove and middle recovery groove, and the purpose is to facilitate the reduction of the material of shell, the cost saving, and also prevents the high from being unfavorable to the cleaning of impurities. The utility model discloses the mesh on coarse recovery groove and middle recovery groove and the same size with the mesh on coarse filter screen and middle filter screen, and the purpose is to facilitate the filtration of the redundant moisture in impurities. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 The structure of the present application is shown in the figure. Figure 2 The partial cross-sectional view of the present application is shown in the figure. Figure 1 Figure 3 Figure 1 The structure of the coarse filter screen, the medium filter screen and the fine filter screen is shown in the figure. In the figure: 1 - shell, 2 - coarse filter screen, 3 - medium filter screen, 4 - fine filter screen, 5 - coarse recovery tank, 6 - medium recovery tank, 7 - tank body, 8 - U-shaped baffle, 9 - H-shaped support, 10 - vertical rod, 11 - horizontal rod, 12 - reinforcing rod, 13 - hanging ring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0019] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0020] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the device or element indicated, which must have a specific orientation, structure and operation, and therefore cannot be understood as a limitation on the present application.

[0021] ​In addition, if the terms "first", "second", "third", etc. are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0022] In addition, if the terms "horizontal", "vertical", "suspended", etc. do not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", not that the structure must be completely horizontal, but can be slightly inclined.

[0023] In the description of the present application, it should be pointed out that, unless otherwise specified and limited, if the terms "set", "install", "connect", "connect" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0025] Embodiment 1 In order to solve the problem that the prior art cannot separate the filtered impurities in time, so as to easily cause the screen to be blocked, the filtering efficiency is low, and the maintenance cost is high. As shown in Figures 1-3 A multi-stage screen for sandstone plant wastewater treatment is provided, which includes a shell 1 with top and bottom openings, a coarse filter screen 2, a medium filter screen 3 and a fine filter screen 4 inclinedly arranged on the shell from top to bottom, a coarse recovery tank 5 and a medium recovery tank 6 arranged on one side of the low end of the coarse filter screen 2 and the medium filter screen 3 to recover the coarse impurities and the medium impurities filtered by the coarse filter screen 2 and the medium filter screen 3, and a tank body 7 with a top opening formed by the shell 1 and the fine filter screen 4 located on one side of the low end of the fine filter screen 4. The mesh size of the coarse filter screen 2, the medium filter screen 3 and the fine filter screen 4 is selected according to the actual demand.

[0026] In practice, the multi-stage screen is installed in the wastewater tank. When the wastewater in the sandstone factory is treated, the wastewater falls from the high end of the coarse filter screen 2. Part of the filtered wastewater falls into the middle filter screen 3, and part flows in the direction of the downward slope. When flowing, the filtered coarse impurities are flushed into the coarse recovery tank 5. The wastewater falls into the middle filter screen 3. The wastewater falling from the high end of the middle filter screen 3, part of the filtered wastewater falls into the low end of the fine filter screen 4 and is discharged after being filtered by the fine filter screen 4. The other part flows in the direction of the downward slope. When flowing, the filtered medium impurities are flushed into the medium recovery tank 6. The wastewater is filtered and discharged from the high end of the fine filter screen 4 or part of it moves to the low end of the fine filter screen and is discharged. The filtered wastewater is discharged through the wastewater tank for subsequent treatment. After each wastewater treatment is completed, the coarse recovery tank 5 and the medium recovery tank 6 can be quickly removed for impurity cleaning. The filtered fine impurities can be scraped or scooped out by other auxiliary tools through the tank body 7. Of course, a fine recovery tank with an opening at the high end of the low end and a mesh size the same as that of the fine filter screen 4 can also be installed on the low end of the fine filter screen 4. This facilitates the filtering of most of the fine impurities at the low end into the fine recovery tank. After the wastewater treatment is completed, it can be lifted for cleaning. In practice, the appropriate one is selected according to the needs. In this embodiment, the coarse filter screen, the middle filter screen and the fine filter screen are arranged obliquely on the shell. The coarse recovery tank and the medium recovery tank for recovering the coarse impurities and the medium impurities filtered by the coarse filter screen and the medium filter screen at the low end of the coarse filter screen and the medium filter screen are arranged. The tank body is formed at the low end of the fine filter screen. This facilitates the timely separation of the filtered impurities by the coarse recovery tank, the medium recovery tank and the tank body. This effectively avoids screen clogging, improves filtering efficiency and reduces maintenance costs.

[0027] Example 2 On the basis of example 1, the inclination directions of the coarse filter screen 2 and the middle filter screen 3 are the same, and the inclination direction of the fine filter screen 4 is opposite to that of the coarse filter screen 2 and the middle filter screen 3. The fine filter screen is limited to be opposite to the inclination direction of the coarse filter screen and the middle filter screen. The purpose is to facilitate the wastewater to directly fall into the low end of the fine filter screen after being filtered by the coarse filter screen and the middle filter screen, and to be discharged after being filtered. This facilitates the gathering of fine impurities at the low end. This not only facilitates cleaning, but also effectively avoids the problem that fine impurities are attached to the high end and are not easy to be flushed to the low end for cleaning.

[0028] Example 3 On the basis of example 2, the inclination angles of the coarse filter screen 2, the middle filter screen 3 and the fine filter screen 4 are 5°-15°, such as 9°, 10° or 11°. The purpose of limiting the inclination angles of the coarse filter screen, the middle filter screen and the fine filter screen is to avoid the problem that the angle is too small and the filtered impurities are not easy to be gathered at the low end, and the angle is too large, which is required to meet the length requirement of the filter and the problem of large height space requirement.

[0029] Example 4 On the basis of embodiment 3, a U-shaped baffle 8 is arranged on the shell 1 at the high end of the coarse filter screen 2. The purpose of arranging the U-shaped baffle on the shell is to facilitate the waste water to flow onto the U-shaped baffle, so that the waste water is filtered from the high end of the coarse filter screen, and the filtered impurities are collected to the low end by the reverse impact force of the waste water or the force of the waste water flowing to the low end, and the filtered impurities are collected to the low end by the vibration force generated by the waste water falling through the coarse filter screen and the force of the waste water flowing to the low end, so as to effectively avoid the problem of hole blockage.

[0030] Embodiment 5 On the basis of embodiment 4, H-shaped supports 9 are respectively arranged on the low end of the middle filter screen 3 and the high end of the fine filter screen 4. The H-shaped support 9 includes a vertical rod 10 and a horizontal rod 11 connected to the vertical rod 10. One vertical rod 10 of the H-shaped support 9 on the middle filter screen 3 is connected to the low end of the coarse filter screen 2, and one vertical rod 10 of the H-shaped support 9 on the fine filter screen 4 is connected to the low end of the middle filter screen 3. The coarse recovery tank 5 and the middle recovery tank 6 are arranged on the H-shaped supports 9 on the middle filter screen 3 and the fine filter screen 4, respectively. The coarse recovery tank and the middle recovery tank are fixed on the low end of the coarse filter screen and the middle filter screen by the H-shaped support, which facilitates the recovery of the corresponding impurities and enables quick removal for recovery. Meanwhile, the H-shaped support 9 can provide support force to the filter screen above, and does not affect the entry of impurities into the corresponding coarse recovery tank 5 and middle recovery tank 6.

[0031] Embodiment 6 On the basis of embodiment 5, a reinforcing rod 12 is arranged on the bottom side of the coarse filter screen 2, the middle filter screen 3 and the fine filter screen 4 and connected to the shell 1. The reinforcing rod is arranged on the bottom side of the coarse filter screen, the middle filter screen and the fine filter screen, so as to facilitate the increase of the strength of each filter screen.

[0032] Embodiment 7 On the basis of embodiment 6, the shell 1 is a non-porous shell or a porous shell with holes that are not larger than the mesh holes on the fine filter screen. The U-shaped baffle 8 is a non-porous U-shaped baffle or a porous U-shaped baffle with holes that are not larger than the mesh holes on the fine filter screen.

[0033] The non-porous and porous holes on the shell and the U-shaped baffle are arranged to facilitate the selection of suitable ones according to the filtering requirements. In the case of the porous holes, the filtered waste water can be quickly discharged from all around, and the impurities can also be filtered layer by layer onto the corresponding filter screen, effectively avoiding the problem of hole blockage of the fine filter screen and increasing the area of fine filtering.

[0034] Embodiment 8 On the basis of Embodiment 7, a hanging ring 13 is arranged on the coarse recovery tank 5 and the middle recovery tank 6 on one side of the H-shaped support 9. The hanging ring is arranged on the coarse recovery tank and the middle recovery tank for the purpose of facilitating the removal of the coarse recovery tank and the middle recovery tank and cleaning.

[0035] Embodiment 9 On the basis of Embodiment 7, the height of the shell 1 forming the tank body 7 is not higher than the height of the middle filter screen 3, and of course, it cannot be too low to avoid the situation that it cannot be filtered; the top surface of the shell 1 adjacent to the H-shaped support 9 is located at the same horizontal plane as the top surface of the corresponding coarse recovery tank 5 and middle recovery tank 6. The height of the shell is limited to the height of the tank body, the coarse recovery tank and the middle recovery tank for the purpose of facilitating the reduction of the material of the shell and saving the cost, and at the same time, it prevents the situation that the height is too high and is not conducive to the cleaning of impurities.

[0036] Embodiment 10 On the basis of Embodiment 9, the coarse recovery tank 5 and the middle recovery tank 6 are provided with mesh holes and the size of the mesh holes is the same as that of the mesh holes on the coarse filter screen 2 and the middle filter screen 3. The coarse recovery tank and the middle recovery tank are provided with mesh holes and the size of the mesh holes is the same as that of the mesh holes on the coarse filter screen and the middle filter screen for the purpose of facilitating the filtration of the excess moisture in the impurities.

Claims

1. A multi-stage screen for wastewater treatment in sand and gravel plants, characterized in that: The shell (1) includes openings at the top and bottom, a coarse filter (2), a medium filter (3) and a fine filter (4) arranged obliquely from top to bottom on the shell, a coarse recovery tank (5) and a medium recovery tank (6) arranged on the lower side of the coarse filter (2) and the medium filter (3) to recover coarse and medium impurities filtered by the coarse filter (2) and the medium filter (3), and located on the lower side of the fine filter (4). The shell (1) and the fine filter (4) form a tank (7) with an opening at the top.

2. The multi-stage screen for wastewater treatment in sand and gravel plants according to claim 1, characterized in that: The coarse filter (2) and the medium filter (3) are tilted in the same direction, while the fine filter (4) is tilted in the opposite direction to the coarse filter (2) and the medium filter (3).

3. A multi-stage screen for wastewater treatment in sand and gravel plants according to claim 1 or 2, characterized in that: The inclination angles of the coarse filter (2), medium filter (3) and fine filter (4) are 5°-15°.

4. The multi-stage screen for wastewater treatment in sand and gravel plants according to claim 1, characterized in that: Located on the high end side of the coarse filter (2), a U-shaped baffle (8) is provided on the housing (1).

5. A multi-stage screen for treating wastewater in a sand and gravel plant according to claim 1, characterized in that: H-shaped supports (9) are respectively provided on the lower side of the middle filter (3) and the upper side of the fine filter (4). The H-shaped supports (9) include vertical rods (10) and horizontal rods (11) connected to the vertical rods (10). One vertical rod (10) of the H-shaped support (9) on the middle filter (3) is connected to the lower bottom surface of the coarse filter (2). One vertical rod (10) of the H-shaped support (9) on the fine filter (4) is connected to the lower bottom surface of the middle filter (3). The coarse recovery tank (5) and the middle recovery tank (6) are respectively placed on the H-shaped supports (9) on the middle filter (3) and the fine filter (4).

6. A multi-stage screen for treating wastewater in a sand and gravel plant according to claim 1, characterized in that: A reinforcing rod (12) connected to the housing (1) is provided on one side of the bottom of the coarse filter (2), the medium filter (3) and the fine filter (4).

7. A multi-stage screen for treating wastewater in a sand and gravel plant according to claim 4, characterized in that: The housing (1) is a non-porous housing or a porous housing with mesh openings no larger than those on a fine filter screen; The U-shaped baffle (8) is a non-perforated U-shaped baffle or a perforated U-shaped baffle with mesh holes no larger than those on the fine filter screen.

8. A multi-stage screen for treating wastewater in a sand and gravel plant according to claim 5, characterized in that: Hanging rings (13) are provided on the coarse recycling tank (5) and the medium recycling tank (6) located on one side of the H-shaped support (9).

9. A multi-stage screen for treating wastewater in a sand and gravel plant according to claim 6, characterized in that: The height of the shell (1) forming the tank (7) is not higher than the height of the middle filter screen (3); The top surface of the shell (1) adjacent to the H-type support (9) is on the same horizontal plane as the top surfaces of the corresponding coarse recovery tank (5) and medium recovery tank (6).

10. A multi-stage screen for treating wastewater in a sand and gravel plant according to claim 1, characterized in that: The coarse recovery tank (5) and the medium recovery tank (6) are provided with mesh holes of the same size as the mesh holes on the coarse filter screen (2) and the medium filter screen (3).

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