Hydraulic screening multi-stage filtering device

Abstract

The utility model discloses a hydraulic screening multi-stage filtering device which comprises a water collecting tank, a slurry pump is arranged in the water collecting tank, an outlet of the slurry pump is simultaneously communicated with inlets of hydrocyclones in a first-stage filtering unit through a water inlet pipe group, a coarse slag collecting tank is arranged below the first-stage filtering unit, and a second slag collecting tank is arranged below the coarse slag collecting tank. An upper overflow port of each hydrocyclone is communicated with an inlet of the second-stage filtering unit through a drainage pipeline, the second-stage filtering unit comprises a cylindrical screen body composed of a screen body frame and a cylindrical screen mesh, the cylindrical screen body is gradually and downwards obliquely arranged from the inlet end to the outlet end, the cylindrical screen mesh is composed of a plurality of screen strips which are arranged in parallel at intervals, and the screen body frame is communicated with the cylindrical screen mesh. The installation direction of each screen bar is consistent with the axial direction of the cylindrical screen body, the cylindrical screen body is driven by a positioning driving mechanism to rotate, a circulating water tank is arranged below the cylindrical screen body, a circulating water pump is arranged on the circulating water tank, and a fine slag collecting box is arranged below the outlet end of the cylindrical screen body. The filter has the advantages of being not easy to block and good in filtering effect.

Description

Technical Field

[0001] The utility model relates to a screening and filtering device, in particular to a hydraulic screening and multi-stage filtering device for screening and filtering a mixed solution discharged from a dehydrator in the PET plastic bottle cleaning and recycling industry. Background Art

[0002] In the process of recycling PET plastic bottles, PET bottles will be contaminated by impurities such as mud, dust, etc. In the PET plastic bottle cleaning and recycling industry, the recycled PET bottles need to be crushed, cleaned, dehydrated and other processing processes in sequence. When the dehydrator dehydrates the crushed PET bottle flakes, the high-speed rotating main shaft blades of the dehydrator continuously hit the PET bottle flakes, causing the PET bottle flakes to hit the screen inside the dehydrator at high speed. Due to the physical characteristics of PET bottle flakes, fine particles and powder of PET bottle flakes will be generated during the hitting and collision process, and the fine particles and powder will be discharged from the equipment together with the water removed by the dehydrator.

[0003] At present, the filtering device for screening and filtering the mixed solution containing fine particles and powder discharged from the dehydrator includes: a water collecting tank, a filtering water pump is installed at the bottom of the water collecting tank, a circular vibrating screen is installed at the outlet of the filtering water pump, a ton bag rack is set at the outlet of the screened material of the circular vibrating screen, ton bag bags are installed in the ton bag rack, a return water tank is set at the outlet of the screened material of the circular vibrating screen, a circulating water pump is installed at the bottom of the return water tank, and the outlet of the circulating water pump is connected to the water-using equipment. The disadvantages of this filtering device are: the circular vibrating screen usually adopts a woven mat-type mesh with a small wire diameter. Since the fine particles of PET bottle flakes generated during the hitting and impact process are irregular polygons, during the filtration process, the sharp corners of the fine particles will be inserted and stuck in the mesh of the screen. As the production proceeds, the filtration area of ​​the screen will gradually decrease, and the dehydrated mixed solution will flow directly from the screen outlet of the circular vibrating screen into the ton bag without being filtered, which not only pollutes the on-site environment and increases the water consumption of the production line, but also requires replacement of the screen that can no longer be used, resulting in an increase in production costs and poor filtration effect. Utility Model Content

[0004] The utility model aims to provide a hydraulic screening multi-stage filtering device which is not easy to be blocked, has high durability and good filtering effect.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is: a hydraulic screening multi-stage filtering device, including a water collecting box and a primary filtering unit composed of a plurality of hydrocyclones, a slurry pump is arranged in the water collecting box, the outlet of the slurry pump is connected to the inlet of each hydrocyclone in the primary filtering unit through a water inlet pipe group, a coarse slag collecting box for collecting coarse slag discharged from the bottom outlet of each hydrocyclone is arranged below the primary filtering unit, the upper overflow port of each hydrocyclone is connected to the inlet of the secondary filtering unit through a drainage pipeline, and the secondary filtering unit comprises: a cylindrical screen composed of a screen frame and a cylindrical screen mesh arranged around the outer periphery of the screen frame The sieve body, both ends of the cylindrical sieve body are open to form the inlet and outlet of the secondary filter unit respectively, the cylindrical sieve body is arranged to be gradually inclined downward from the inlet end to the outlet end, the cylindrical screen is composed of a plurality of parallel and spaced screen bars, the installation direction of each screen bar is consistent with the axial direction of the cylindrical sieve body, the cylindrical sieve body is driven to rotate by a positioning drive mechanism, a circulating water tank for collecting the solution filtered out from the gaps between the screen bars of the cylindrical sieve is arranged below the cylindrical sieve body, a circulating water pump is arranged on the circulating water tank, and a fine slag box for collecting fine slag discharged from the outlet of the secondary filter unit of the cylindrical sieve body is arranged below the outlet end of the cylindrical sieve body.

[0006] Furthermore, the aforementioned hydraulic screening multi-stage filtration device, wherein: the water inlet pipe group includes: a first water inlet pipe, a water inlet box, the inlet of the first water inlet pipe is connected to the outlet of the slurry pump, the outlet of the first water inlet pipe is connected to the inlet of the water inlet box, a plurality of outlets are arranged on the water inlet box, each outlet of the water inlet box corresponds to a hydrocyclone, and each outlet of the water inlet box is connected to the tangential feed port of the corresponding hydrocyclone through a second water inlet pipe.

[0007] Furthermore, in the aforementioned hydraulic screening multi-stage filtering device, the hydrocyclones are evenly arranged around a water inlet tank, and the water inlet tank is located at the center of a circle formed by the hydrocyclones.

[0008] Furthermore, the aforementioned hydraulic screening multi-stage filtering device, wherein: the drainage pipeline includes: an overflow pipe arranged at the overflow port of each hydrocyclone, all overflow pipes are connected to the water outlet tank at the same time, and the water outlet tank is connected to the inlet of the secondary filtering unit through a connecting pipe.

[0009] Furthermore, in the aforementioned hydraulic screening multi-stage filtering device, the cylindrical screen is composed of a plurality of circular arc screen segments sequentially assembled along the circumferential direction, and each circular arc screen segment is detachably mounted on the screen body frame of the cylindrical screen body by bolts.

[0010] Furthermore, the aforementioned hydraulic screening multi-stage filtering device, wherein: the structure of the positioning drive mechanism includes: a base frame, a pair of supporting wheels are respectively supported on the front and rear sides of the base frame, all the supporting wheels together constitute a rotating supporting platform for supporting the cylindrical screen body, annular positioning grooves are respectively arranged on the screen body frame at the front and rear ends of the cylindrical screen body, a pair of supporting wheels located on the front side of the base frame are rollingly embedded in the annular positioning groove at the front end of the screen body frame, and a pair of supporting wheels located on the rear side of the base frame are rollingly embedded in the annular positioning groove at the rear end of the screen body frame, and a driving motor for driving the supporting wheels to rotate is also arranged on the base frame.

[0011] Through the implementation of the above technical scheme, the beneficial effects of the utility model are: using a hydrocyclone as the primary filtration, and a rotating screen composed of screen bars as the secondary filtration, which is not only not easy to clog, but also has high durability and long service life, effectively reducing the production and use costs of the enterprise, and has a good filtering effect on the mixed solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the hydraulic screening multi-stage filtering device described in the utility model.

[0013] Figure 2 yes Figure 1 Top view of the . DETAILED DESCRIPTION

[0014] The utility model is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0015] like Figure 1 , Figure 2 As shown, the hydraulic screening multi-stage filtering device includes a water collecting box 1 and a primary filtering unit composed of a plurality of hydrocyclones 2. In this embodiment, the number of the hydrocyclones is six; a slurry pump 3 is arranged in the water collecting box 1, and the outlet of the slurry pump 3 is simultaneously connected to the inlet of each hydrocyclone 2 in the primary filtering unit through a water inlet pipe group. In this embodiment, the water inlet pipe group includes: a first water inlet pipe 4 and a water inlet box 5, the inlet of the first water inlet pipe 4 is connected to the outlet of the slurry pump 3, and the outlet of the first water inlet pipe 4 is connected to the inlet of the water inlet box 5. Six outlets are arranged on the water inlet box 5, each outlet of the water inlet box 5 corresponds to a hydrocyclone 2, and each outlet of the water inlet box 5 is connected to the tangential feed port of the corresponding hydrocyclone 2 through a second water inlet pipe 6; each hydrocyclone 2 is evenly arranged around the water inlet box 5, and the water inlet box 5 is located at the center of the circle surrounded by each hydrocyclone 2;

[0016] A coarse slag collecting box 7 is provided below the primary filter unit for collecting the coarse slag discharged from the bottom outlet of each hydrocyclone 3. The upper overflow port of each hydrocyclone 2 is connected to the inlet of the secondary filter unit through a drainage pipeline. In this embodiment, the drainage pipeline includes: an overflow pipe 8 provided at the overflow port of each hydrocyclone 2, all overflow pipes 8 are connected to a water outlet box 9 at the same time, and the water outlet box 9 is connected to the inlet of the secondary filter unit through a connecting pipe 10;

[0017] The secondary filter unit comprises: a cylindrical screen body consisting of a screen frame 11 and a cylindrical screen 12 arranged around the periphery of the screen frame 11, the two ends of the cylindrical screen body are open to form a secondary filter unit inlet 13 and a secondary filter unit outlet 14 respectively, the cylindrical screen body is arranged gradually downward from the inlet end to the outlet end, the cylindrical screen 12 is composed of a plurality of parallel and spaced screen bars, the installation direction of each screen bar is consistent with the axial direction of the cylindrical screen body, the cylindrical screen is composed of a plurality of arc screen segments assembled in sequence along the circumferential direction, the arc screen segments are also composed of a plurality of parallel and spaced screen bars, and each arc screen segment is detachably mounted on the screen frame 11 of the cylindrical screen body by bolts , so that it is more convenient to disassemble and replace the screen. When the screen in a certain area fails, there is no need to replace the entire screen, but only the arc screen segment corresponding to the area needs to be replaced, which reduces the maintenance cost of the enterprise; the cylindrical screen body is driven to rotate by the positioning drive mechanism, and a circulating water tank 15 for collecting the solution filtered out from the gaps between the screen bars of the cylindrical screen 12 is provided below the cylindrical screen body, and a circulating water pump 16 is provided on the circulating water tank 15. The circulating water pump 16 is used to transport the solution in the circulating water tank 15 to the water-using equipment, and a fine slag box 17 for collecting fine slag discharged from the outlet 14 of the secondary filtration unit of the cylindrical screen body is provided below the outlet end of the cylindrical screen body;

[0018] In this embodiment, the structure of the positioning drive mechanism includes: a base frame 18, a pair of supporting wheels 19 are respectively supported on the front and rear sides of the base frame 18, all the supporting wheels 19 together constitute a rotating supporting platform for supporting the cylindrical screen body, and annular positioning grooves 20 are respectively provided on the screen body frame 11 at the front and rear ends of the cylindrical screen body, a pair of supporting wheels 19 located on the front side of the base frame 18 are rollingly embedded in the annular positioning groove 20 at the front end of the screen body frame 11, and a pair of supporting wheels 19 located on the rear side of the base frame 18 are rollingly embedded in the annular positioning groove 20 at the rear end of the screen body frame 11, and a driving motor 21 for driving the supporting wheels to rotate is also provided on the base frame 18, and the driving motor 21 drives the supporting wheels to rotate, and the supporting wheels drive the cylindrical screen body to rotate through the friction between the supporting wheels and the screen body frame;

[0019] The working principle of the utility model is:

[0020] After the mixed solution mixed with PET bottle flakes fine particles and powder is discharged from the dehydrator, it first flows into the water collecting tank 1. The slurry pump 3 pumps the mixed solution into the water inlet tank 5 through the first water inlet pipe 4. Since the water inlet tank 5 is connected with the inlet of each hydrocyclone 2, the mixed solution will enter each hydrocyclone 2 from the tangential feed port of the hydrocyclone 2 along the tangential direction at a certain pressure and flow rate under the action of the slurry pump 3. After the mixed solution enters the hydrocyclone 2, the fine particles in the mixed solution will be thrown into the water due to the large centrifugal force. The mixed solution flows along the inner wall of the hydrocyclone 2 and rotates downward, and is discharged from the bottom outlet of the hydrocyclone 2 and falls downward into the coarse slag collecting box 7 below. Since the lower part of the hydrocyclone 7 is inverted cone shape, after the mixed solution enters the cone section, the flow cross section gradually decreases, and an inner vortex is formed under the contraction and extrusion of fine particles. The solution containing powder will move from bottom to top and be discharged from the overflow port of the hydrocyclone 2 into the overflow pipe 8. The powder-containing solution flowing into the overflow pipe 8 is collected in the outlet box 9, and then enters the secondary filtration unit inlet 13 of the cylindrical screen body through the connecting pipe 10;

[0021] At this time, the driving motor 21 will drive the supporting wheel 19 to rotate, and the supporting wheel 19 drives the cylindrical screen body to rotate through the friction between the cylindrical screen body frame 11. Since the cylindrical screen body has a certain inclination angle, and the installation direction of each screen bar of its cylindrical screen 12 is consistent with the inclination angle of the cylindrical screen body, after the solution containing powder flows into the rotating cylindrical screen body, under the joint action of the rotating cylindrical screen body and its cylindrical screen, the filtrate in the powder-containing solution will flow from the gaps between the screen bars of the cylindrical screen 12 into the circulating water tank 15 below, and the circulating water pump 16 will then transport the filtrate in the circulating water tank 15 to the water-using equipment, and the powder in the powder-containing solution will flow out from the outlet 14 of the secondary filtration unit of the cylindrical screen body and fall into the fine slag box 17.

[0022] The beneficial effects of the utility model are: using a hydrocyclone as the primary filtration, and a rotary screen composed of screen bars as the secondary filtration, which is not only not easy to be blocked, but also has high durability and long service life, effectively reducing the production and use costs of the enterprise, and has a good filtering effect on the mixed solution.

Claims

1. Hydraulic screening multi-stage filtration device, characterized by: The invention comprises a water collecting tank and a primary filtering unit composed of a plurality of hydrocyclones, a slurry pump is arranged in the water collecting tank, the outlet of the slurry pump is connected to the inlet of each hydrocyclone in the primary filtering unit through a water inlet pipe group, a coarse slag collecting box for collecting coarse slag discharged from the bottom outlet of each hydrocyclone is arranged below the primary filtering unit, the upper overflow port of each hydrocyclone is connected to the inlet of the secondary filtering unit through a drainage pipeline, and the secondary filtering unit comprises: a cylindrical screen body composed of a screen body frame and a cylindrical screen mesh arranged around the periphery of the screen body frame, and the two ends of the cylindrical screen body are open to form The cylindrical screen body is arranged to be gradually inclined downward from the inlet end to the outlet end, and the cylindrical screen is composed of a plurality of screen bars arranged in parallel and at intervals, and the installation direction of each screen bar is consistent with the axial direction of the cylindrical screen body. The cylindrical screen body is driven to rotate by a positioning drive mechanism, and a circulating water tank for collecting the solution filtered out from the screen bar gaps of the cylindrical screen is arranged below the cylindrical screen body, and a circulating water pump is arranged on the circulating water tank, and a fine slag collecting box for collecting fine slag discharged from the outlet of the secondary filter unit of the cylindrical screen body is arranged below the outlet end of the cylindrical screen body.

2. The hydraulic screening multi-stage filtration device according to claim 1, characterized in that: The water inlet pipe group includes: a first water inlet pipe and a water inlet box. The inlet of the first water inlet pipe is connected to the outlet of the slurry pump, and the outlet of the first water inlet pipe is connected to the inlet of the water inlet box. A plurality of outlets are arranged on the water inlet box. Each outlet of the water inlet box corresponds to a hydrocyclone, and each outlet of the water inlet box is connected to a tangential feed port of the corresponding hydrocyclone through a second water inlet pipe.

3. The hydraulic screening multi-stage filtration device according to claim 2, characterized in that: The hydrocyclones are evenly arranged around the water inlet tank, and the water inlet tank is located at the center of the circle formed by the hydrocyclones.

4. The hydraulic screening multi-stage filtration device according to claim 1, characterized in that: The drainage pipeline includes: an overflow pipe arranged at the overflow port of each hydrocyclone, all overflow pipes are connected to the water outlet tank at the same time, and the water outlet tank is connected to the inlet of the secondary filter unit through a connecting pipe.

5. The hydraulic screening multi-stage filtration device according to claim 1, characterized in that: The cylindrical screen is composed of a plurality of arc screen segments which are sequentially assembled along the circumferential direction, and each arc screen segment is detachably mounted on the screen body frame of the cylindrical screen body by bolts.

6. The hydraulic screening multi-stage filtration device according to claim 1, characterized in that: The structure of the positioning drive mechanism includes: a base frame, a pair of supporting wheels are supported on the front and rear sides of the base frame respectively, all the supporting wheels together constitute a rotating supporting platform for supporting the cylindrical screen body, and annular positioning grooves are respectively arranged on the screen body frame at the front and rear ends of the cylindrical screen body, a pair of supporting wheels located on the front side of the base frame are rollingly embedded in the annular positioning groove at the front end of the screen body frame, and a pair of supporting wheels located on the rear side of the base frame are rollingly embedded in the annular positioning groove at the rear end of the screen body frame, and a driving motor for driving the supporting wheels to rotate is also arranged on the base frame.

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