Automatic adjustment device for adding flocculant to thickener

Abstract

This utility model discloses an automatic adjustment device for adding flocculant to a thickener, including a thickener, a dosing pump, a liquid level boundary detection mechanism, and a PLC controller. The liquid level boundary detection mechanism is installed inside the thickener's cavity, and its signal terminal is electrically connected to the PLC controller. The inlet and outlet of the dosing pump are connected to an external chemical tank and the thickener's cavity, respectively. The PLC controller is electrically connected to the dosing pump and a flow meter on the delivery pipe. This device can accurately determine the boundary between turbid and clear water based on the liquid level boundary detection mechanism, knowing the height of the clear water layer and the turbid liquid layer. The PLC controller then controls the working state of the dosing pump, precisely controlling the amount of flocculant added to the thickener. This achieves both precise dosing and automated control, improving efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of water treatment dosing equipment, and in particular to an automatic adjustment device for adding flocculants to a thickener. Background Technology

[0002] A thickener is a solid-liquid separation device based on gravity settling. It can concentrate slurry with a solid content of 10% to 20% into underflow slurry with a solid content of 45% to 55% by gravity, reagents, or a combination of both. The thickened underflow slurry is discharged from the underflow port at the bottom of the thickener, and a relatively clean clarified liquid (overflow) is generated at the top of the thickener and discharged from the annular chute at the top.

[0003] During the operation of a thickener, flocculants need to be added to accelerate sedimentation and improve thickening. However, the amount of flocculant to be added is often difficult to determine. It is mostly determined based on the clarity of the overflow water or the height of the clear water layer, requiring frequent manual measurement of the clear water layer height. The amount of flocculant added each time is difficult to control, resulting in inconsistent dosages. If too much flocculant is added, the cost is too high, and there is excessive chemical residue in the overflow water; if too little flocculant is added, the clear water layer is too low, and the solid content of the overflow water increases, affecting subsequent processes. There is an urgent need for a device that can precisely control the amount of flocculant added based on the position of the turbidity-clear water boundary line within the thickener. Utility Model Content

[0004] The purpose of this invention is to provide an automatic adjustment device for adding flocculant to a thickener, so as to solve the problem of difficulty in accurately controlling the content of flocculant added based on the position of the turbidity-clarity boundary line in the thickener.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An automatic adjustment device for adding flocculant to a thickener includes a thickener, a dosing pump, a liquid level boundary detection mechanism, and a PLC controller. The liquid level boundary detection mechanism is installed inside the cavity of the thickener, and its signal terminal is electrically connected to the PLC controller. The inlet and outlet of the dosing pump are respectively connected to an external chemical tank and the cavity of the thickener. The PLC controller is electrically connected to the flow meter on the dosing pump and the delivery pipe.

[0007] A further technical solution is as follows: the liquid level boundary detection mechanism includes a hollow rod, a float, a magnetic block, a slider, and a distance sensor. The hollow rod is vertically installed in the cavity of the thickener. The float is slidably installed on the hollow rod and is located at the boundary between turbid water and clear water. The magnetic block is installed on the float. The slider is slidably installed inside the hollow rod and attracts the magnetic block. The distance sensor is installed on the top of the hollow rod, and the sensing end of the distance sensor faces the slider.

[0008] A further technical solution is that the distance sensor is an infrared sensor.

[0009] A further technical solution is that the float is divided into a buoyancy hollow part and a weight-adjusting hollow part from bottom to top, and the buoyancy hollow part has a boat-shaped structure.

[0010] A further technical solution is that the hollow part for adjusting the weight is provided with a counterweight inlet that is sealed by bolts.

[0011] A further technical solution is: a removal mechanism is provided between the thickener and the float. The removal mechanism includes a lifting ring, a flexible line, and a pulley system. The lifting ring is threaded onto the top of the float, the pulley system is installed on the outside of the thickener, and the two ends of the flexible line are respectively connected to the lifting ring and the pulley system.

[0012] A further technical solution is that an end cap is threaded onto the top of the hollow rod, and the distance sensor is mounted on the end cap.

[0013] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0014] This invention proposes an automatic adjustment device for adding flocculant in a thickener. This device can accurately determine the boundary between turbid and clear water based on the liquid level boundary detection mechanism, and know the height of the clear water layer and the turbid liquid layer. Then, the working status of the dosing pump is controlled by a PLC controller to accurately control the amount of flocculant added in the thickener. On the basis of accurate dosing, it also realizes automated control and improves efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an automatic adjustment device for adding flocculant to a thickener according to the present invention.

[0016] Figure 2 This utility model Figure 1 A schematic diagram of the liquid level boundary detection mechanism.

[0017] Figure 3 This utility model Figure 1 A schematic diagram of the extraction mechanism.

[0018] Figure 4 This utility model Figure 1 A schematic diagram of the structure of the buoy.

[0019] Reference numerals: 1. Thickener; 2. Dosing pump; 3. Liquid level boundary detection mechanism; 4. Flow meter; 5. Hollow rod; 6. Float; 7. Magnetic block; 8. Sliding block; 9. Distance sensor; 10. Removal mechanism; 11. Lifting ring; 12. Flexible wire; 13. Pulley block; 14. End cap. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1:

[0027] This implementation example Figure 1 and Figure 2 As shown, the automatic adjustment device for adding flocculant to the thickener includes a thickener 1, a dosing pump 2 (generally a screw pump), a liquid level boundary detection mechanism 3, and a PLC controller. The liquid level boundary detection mechanism 3 is installed inside the cavity of the thickener 1, and the signal terminal of the liquid level boundary detection mechanism 3 is electrically connected to the PLC controller. The inlet and outlet of the dosing pump 2 are connected to the external medicine tank and the cavity of the thickener 1, respectively. The PLC controller is electrically connected to the dosing pump 2 and the flow meter 4 on the delivery pipe.

[0028] In thickener 1, turbid water, after the addition of flocculant and sedimentation, forms a turbid liquid layer at the bottom and a clear water layer at the top. Generally, for precise dosing, the height of either the clear or turbid water layer needs to be manually measured, and the frequency of the flocculant feed screw is adjusted accordingly, typically once per hour. However, the height of the clear and turbid water layers in thickener 1 is significantly affected by variations in feed concentration, feed rate, and material fineness. As the feed changes, the height of the clear water layer also changes in real time, making it difficult to maintain a stable clear water layer through intermittent manual measurement. Therefore, a liquid level boundary detection mechanism 3 has been added to the existing thickener 1. This mechanism automatically measures the position of the boundary liquid level and then uses a PLC controller to control the operation of the dosing pump, precisely controlling the amount of flocculant added to the thickener. This not only ensures precise dosing but also achieves automated control, improving efficiency.

[0029] Example 2:

[0030] Based on the above embodiments, this embodiment, for example Figure 2 As shown, the liquid level boundary detection mechanism 3 includes a hollow rod 5, a float 6, a magnetic block 7, a slider 8, and a distance sensor 9. The hollow rod 5 is vertically installed in the cavity of the thickener 1. The float 6 is slidably installed on the hollow rod 5 and is located at the boundary between turbid water and clear water. The magnetic block 7 is installed on the float 6. The slider 8 is slidably installed inside the hollow rod 5 and attracts the magnetic block 7. The distance sensor 9 is installed on the top of the hollow rod 5, and the sensing end of the distance sensor 9 faces the slider 8.

[0031] The density of float 6 is controlled based on the densities of the turbid and clear liquids. The density of float 6 (which must simultaneously take into account the mass of magnetic block 7 and slider 8) must be between the densities of the two liquids to ensure it floats between them. The position of float 6 changes according to the position of the boundary between the two liquids. Simultaneously, slider 8 moves up and down with float 6 under the influence of magnetic block 7. Distance sensor 9 measures the distance between slider 8 and float 6 based on their position changes and feeds this information back to the PLC controller. The PLC controller uses this data to control the operation of dosing pump 2, precisely controlling the amount of flocculant added to the thickener. This precise dosing also achieves automated control, improving efficiency.

[0032] Preferably, the distance sensor 9 is an infrared sensor.

[0033] The infrared sensor emits light, which is reflected by slider 8. The infrared sensor receives the reflected light and calculates the distance between itself and slider 8. The PLC controller determines the height of the turbid liquid or liquid based on other fixed parameters (such as the position of the infrared sensor and the water level in the thickener). The PLC controller controls the working status of the dosing pump 2 based on the height data, accurately controlling the amount of flocculant added in the thickener. On the basis of accurate dosing, it also realizes automated control and improves efficiency.

[0034] Preferably, such as Figure 3 As shown, the float 6 is divided into a buoyancy hollow section and a counterweight hollow section from bottom to top. The buoyancy hollow section has a boat-shaped structure. The counterweight hollow section is equipped with a counterweight inlet that is sealed with bolts.

[0035] The density of the clear water layer generally does not change, meaning the lower limit of the density of float 6 (the calculated density includes the mass of magnet 7 and slider 8) generally does not change either. However, the density of the turbid water layer may change depending on factors such as the solid content or other impurities. When measuring the density of turbid water with changes, it is necessary to adjust the density of float 6 accordingly. Therefore, a suitable counterweight can be added to the hollow part of float 6 to control the density.

[0036] The hollow buoyancy section has a boat-shaped structure, which ensures its buoyancy performance in turbid water.

[0037] Example 3:

[0038] Based on the above embodiments, this embodiment, for example Figure 4 As shown, a take-out mechanism 10 is provided between the thickener 1 and the float 6. The take-out mechanism 10 includes a lifting ring 11, a flexible line 12 and a pulley block 13. The lifting ring 11 is threaded onto the top of the float 6, the pulley block 13 is installed on the outside of the thickener 1, and the two ends of the flexible line 12 are connected to the lifting ring 11 and the pulley block 13 respectively.

[0039] When it is inconvenient to enter the thickener 1 to operate the float 6 when the density of the float 6 needs to be changed or when the float 6 needs to be disassembled, repaired or replaced, especially when there is water in it, the pulley block 13 can be used to wind up the soft line 12 to lift the lifting ring together with the float 6 and take the float 6 out of the thickener 1.

[0040] Preferably, an end cap 14 is threaded onto the top of the hollow rod 5, and a distance sensor 9 is mounted on the end cap 14.

[0041] Distance sensor 9 is installed on end cap 14, and distance sensor 9 can be removed and replaced.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic adjusting device for adding flocculant to a thickener, characterized in that: The device includes a thickener (1), a dosing pump (2), a liquid level boundary detection mechanism (3), and a PLC controller. The liquid level boundary detection mechanism (3) is installed inside the cavity of the thickener (1), and the signal terminal of the liquid level boundary detection mechanism (3) is electrically connected to the PLC controller. The inlet and outlet of the dosing pump (2) are respectively connected to the external medicine tank and the cavity of the thickener (1). The PLC controller is electrically connected to the dosing pump (2) and the flow meter (4) on the delivery pipe.

2. The automatic adjusting device for adding flocculant in a thickener according to claim 1, characterized in that: The liquid level boundary detection mechanism (3) includes a hollow rod (5), a float (6), a magnetic block (7), a slider (8), and a distance sensor (9). The hollow rod (5) is vertically installed in the cavity of the thickener (1). The float (6) is slidably installed on the hollow rod (5) and is located on the boundary line between turbid water and clear water. The magnetic block (7) is installed on the float (6). The slider (8) is slidably installed inside the hollow rod (5) and attracts the magnetic block (7). The distance sensor (9) is installed on the top of the hollow rod (5) and the sensing end of the distance sensor (9) faces the slider (8).

3. The automatic adjusting device for adding flocculant in a thickener according to claim 2, characterized in that: The distance sensor (9) is an infrared sensor.

4. The automatic adjusting device for adding flocculant in a thickener according to claim 2, characterized in that: The float (6) is divided into a buoyancy hollow part and a weight-adjusting hollow part from bottom to top, and the buoyancy hollow part has a boat-shaped structure.

5. The automatic adjusting device for adding flocculant in a thickener according to claim 4, characterized in that: The hollow part for adjusting the weight is provided with a counterweight inlet that is sealed with bolts.

6. The automatic adjusting device for adding flocculant in a thickener according to claim 2, characterized in that: A take-out mechanism (10) is provided between the thickener (1) and the float (6). The take-out mechanism (10) includes a lifting ring (11), a flexible line (12), and a pulley block (13). The lifting ring (11) is threaded onto the top of the float (6), and the pulley block (13) is installed on the outside of the thickener (1). The two ends of the flexible line (12) are respectively connected to the lifting ring (11) and the pulley block (13).

7. The automatic adjusting device for adding flocculant in a thickener according to claim 2, characterized in that: The top of the hollow rod (5) is threaded with an end cap (14), and the distance sensor (9) is mounted on the end cap (14).

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