A sewage treatment device that calculates the chemical dosing amount using a PLC

Abstract

The present invention provides a sewage treatment device that calculates the chemical dosing amount using a PLC, which relates to the technical field of sewage treatment. The sewage treatment device that calculates the chemical dosing amount using a PLC includes a treatment tank, which has an accommodation chamber inside. The top wall of the treatment tank extends downward to form a sewage cylinder; at least two chemical agent barrels, the chemical agent barrels are cylindrical structures with openings at both the upper and lower ends, and the lower ends of the chemical agent barrels extend into the interior of the accommodation chamber; a mixing tank, a mixing chamber communicating with the sewage cylinder is provided inside the mixing tank, and a chemical agent inlet is provided at the top of the mixing tank, and the number of the chemical agent inlets is the same as the number of the chemical agent barrels; the mixing tank is driven to rotate by a rotation driving device. When the chemical agent inlet completely or partially overlaps with the lower end opening of the chemical agent barrel, the chemical agents in at least two chemical agent barrels flow into the interior of the mixing tank simultaneously, improving the chemical dosing efficiency and simplifying the control steps.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically to a sewage treatment device that uses a PLC to calculate the chemical dosing amount. Background Art

[0002] Sewage treatment is a process of purifying sewage to meet the water quality requirements for discharging it into a certain water body or reusing it. Sewage treatment is widely applied in various fields such as construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical treatment, and catering, and is also increasingly entering the daily lives of ordinary people.

[0003] In a Chinese invention patent with the authorization announcement number CN108854809B, a sewage treatment chemical dosing device is disclosed, which includes a chemical dosing tank main body, a central water pipe, and a chemical outlet tank. Four chemical dosing pipes are spacedly arranged at the top of the chemical dosing tank main body. A chemical dosing cap is installed at the top of the chemical dosing pipe. Observation slots are opened on the four sides of the top of the chemical dosing tank main body. A glass plate is embedded in the observation slot, and a scale is provided on the glass plate. A central water pipe is fixedly provided at the center of the inner top of the chemical dosing tank main body. Four hopper-shaped plates are fixedly arranged at intervals on the inner top of the chemical dosing tank main body. A first partition plate is fixedly arranged between adjacent two hopper-shaped plates. In the sewage treatment chemical dosing device of the present invention, the combined design of the first partition plate and the hopper-shaped plate can divide the inner top of the chemical dosing tank main body into four chemical chambers to store four kinds of chemicals respectively; the design of the hopper-shaped moisture-absorbing pad can absorb the moisture in the chemicals to prevent the chemicals from caking and deteriorating.

[0004] However, the above technical solution still has the following defects. On the one hand, when adding chemicals to sewage, four first solenoid valves are opened respectively, so that the chemicals in the chemical dosing tank main body flow into the bottom of the chemical dosing tank main body along the chemical outlet pipe respectively, and the control process is relatively cumbersome. On the other hand, due to the different states of different types of chemicals, some are liquid and some are solid particles, the mixing effect of the chemicals is poor. Summary of the Invention

[0005] The purpose of the present invention is to provide a sewage treatment device that uses a PLC to calculate the chemical dosing amount, aiming to solve the problem of the relatively cumbersome control process in the existing sewage treatment devices.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A sewage treatment device that calculates the chemical dosing amount using a PLC, including a treatment tank, which has an accommodation chamber inside, and the top wall of the treatment tank extends downward to form a sewage cylinder; at least two chemical agent barrels, the chemical agent barrels are cylindrical structures with openings at both the upper and lower ends, and the lower ends of the chemical agent barrels extend into the interior of the accommodation chamber; a mixing tank, a mixing chamber communicating with the sewage cylinder is provided inside the mixing tank, a chemical agent inlet is provided at the top of the mixing tank, the number of chemical agent inlets is the same as the number of chemical agent barrels, a rotation driving device, the rotation driving device is used to drive the mixing tank to rotate so that the chemical agent inlets correspond to the chemical agent barrels one by one, and the chemical agent in the chemical agent barrels flows into the mixing chamber from the chemical agent inlets, or the mixing tank closes the chemical agent inlets.

[0007] A further technical solution of the present invention is that a plain bearing is sleeved on the lower end of the sewage cylinder, and the upper end of the plain bearing is fixed to the mixing tank.

[0008] A further technical solution of the present invention is that the rotation driving device includes a first motor installed on the outer wall of the treatment tank, the output shaft of the first motor extends into the interior of the accommodation chamber and is connected with a speed reducer, the output end of the speed reducer is fixedly connected with a gear through a driving shaft, and a toothed ring is meshed with the gear, and the toothed ring is fixed on the mixing tank.

[0009] A further technical solution of the present invention is that a drain port is connected to the bottom of the mixing tank, and a solenoid valve is installed on the drain port.

[0010] A further technical solution of the present invention is that a filter screen is arranged below the drain port, and the filter screen divides the accommodation chamber into an upper chamber and a lower chamber.

[0011] A further technical solution of the present invention is that it further includes a stirring device, the stirring device includes a second motor fixedly installed at the bottom end of the treatment tank, a stirring rod connected to the output end of the second motor and extending upward, and a first stirring blade and a second stirring blade installed on the stirring rod, the first stirring blade is located inside the mixing chamber, and the second stirring blade is located inside the lower chamber.

[0012] A further technical solution of the present invention is that a first sealing bearing is installed at the bottom of the mixing tank, a second sealing bearing is installed on the filter screen, and both the first sealing bearing and the second sealing bearing are sleeved outside the stirring rod.

[0013] A further technical solution of the present invention is that a discharge port is further provided on the lower side wall of the treatment tank, and a drain valve is provided on the discharge port.

[0014] A further technical solution of the present invention is that a chemical adding pipe is provided on the chemical agent barrel, a sewage pipe is provided on the sewage barrel, a first flow meter is installed on the chemical adding pipe to obtain the dosage of the chemical agent added to the chemical agent barrel, and the sewage pipe is connected with a second flow meter to obtain the amount of sewage added into the mixing tank.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. By driving the mixing tank to rotate through the rotation driving device, when the chemical agent inlet completely or partially overlaps with the lower end opening of the chemical agent barrel, the chemical agents in at least two chemical agent barrels flow into the interior of the mixing tank simultaneously, improving the chemical adding efficiency and simplifying the control steps.

[0017] 2. By driving the rotation angle of the mixing tank through the rotation driving device, the overlapping area between the chemical agent inlet and the lower end opening of the chemical agent barrel is controlled to control the flow rate of the chemical agent, avoiding the problems of poor treatment effect caused by excessive addition of chemical agents or waste of chemical agents.

[0018] 3. By providing a filter screen, some agglomerated chemical agents, or residual impurities in the sewage, or impurities formed by the reaction of the chemical agent and the sewage can be filtered out. The mixed chemical agent and sewage in the mixing tank flow into the interior of the lower chamber through the filter screen.

[0019] 4. The first stirring blade can stir the sewage and chemical agent inside the mixing chamber, and the second stirring blade can perform secondary stirring on the sewage inside the lower chamber, effectively avoiding the problem of uneven mixing of the sewage and chemical agent inside the mixing tank and improving the mixing effect of the sewage and the chemical agent.

[0020] 5. The PLC can calculate the required dosage of the chemical agent, and can also calculate the amount of sewage flowing into the mixing tank through the sewage pipe. By calculating the mixing ratio of the chemical agent dosage and the sewage amount in advance, when the dosage of the chemical agent added to the chemical agent barrel reaches the threshold, the PLC controller closes the chemical adding pump. Similarly, when the amount of sewage flowing into the mixing tank reaches the threshold, the PLC controller automatically closes the sewage pump, realizing the precise mixing of the chemical agent and the sewage. Description of the Drawings

[0021] Figure 1 is the three-dimensional structure schematic diagram of the specific embodiment of the present invention;

[0022] Figure 2 is the cross-sectional structure schematic diagram of the specific embodiment of the present invention;

[0023] Figure 3 is the specific embodiment of the present invention Figure 2 of the partial structure schematic diagram;

[0024] Figure 4 is the three-dimensional structure schematic diagram of the rotation driving device of the specific embodiment of the present invention;

[0025] Figure 5 It is a schematic three-dimensional structure diagram of the mixing tank in a specific embodiment of the present invention;

[0026] Figure 6 It is a schematic structure diagram of the combination of the mixing tank and the reagent barrel in a specific embodiment of the present invention;

[0027] Figure 7 is a specific embodiment of the present invention Figure 6 top view structure diagram;

[0028] Figure 8 It is a schematic structure diagram of the mixing tank rotating to open the reagent barrel in a specific embodiment of the present invention;

[0029] Figure 9 It is a schematic three-dimensional structure diagram of another embodiment of the present invention.

[0030] In the figure: 10, treatment tank; 11, accommodation chamber; 111, upper chamber; 112, lower chamber; 12, sewage barrel; 13, discharge port; 14, drain valve; 20, reagent barrel; 21, fastener; 30, mixing tank; 31, mixing chamber; 32, reagent inlet; 33, liquid discharge port; 34, solenoid valve; 40, rotary drive device; 41, first motor; 42, reducer; 43, drive shaft; 44, gear; 45, gear ring; 50, plain bearing; 60, filter screen; 70, stirring device; 71, second motor; 72, stirring rod; 73, first stirring blade; 74, second stirring blade; 80, first sealing bearing; 90, second sealing bearing; 100, chemical addition pipe; 110, sewage pipe; 120, first flowmeter; 130, second flowmeter. Detailed Embodiments

[0031] The following further describes the detailed embodiments of the present invention with reference to the accompanying drawings.

[0032] As Figure 1 and Figure 2 shown, a sewage treatment device that calculates the chemical addition dose using a PLC includes: a treatment tank 10, which has an accommodation chamber 11 inside, and the top wall of the treatment tank 10 extends downward to form a sewage barrel 12; at least two reagent barrels 20, the reagent barrels 20 are tubular structures with openings at both the upper and lower ends, Figure 1 Four reagent barrels 20 are shown in, and the lower ends of the reagent barrels 20 extend into the interior of the accommodation chamber 11; in order to avoid the problem that the reagent remaining on the inner wall of the reagent barrel 20 is mixed with other types of reagents added again, affecting the purity of the reagent, preferably, the reagent barrel 20 is detachably installed on the top of the treatment tank 10 through a fastener 21, so that the reagent barrel 20 can be disassembled to facilitate cleaning of the reagent barrel 20.

[0033] The mixing tank 30 is generally frustum-shaped with a larger diameter at the upper end and a smaller diameter at the lower end. The top surface of the mixing tank 30 tightly seals the lower opening of the chemical agent barrel 20, enabling the chemical agent barrel 20 to hold different chemical agents, such as flocculants. A mixing chamber 31 communicating with the sewage barrel 12 is provided inside the mixing tank 30. A hole for the sewage barrel 12 to freely pass through is provided at the center of the top of the mixing tank 30, such as Figures 5 to 8 shown. A chemical agent inlet 32 is provided at an eccentric position on the top of the mixing tank 30. The number of chemical agent inlets 32 is the same as the number of chemical agent barrels 20. A rotation driving device 40 is used to drive the mixing tank 30 to rotate, so that the chemical agent inlets 32 correspond to the chemical agent barrels 20 one by one. The chemical agent in the chemical agent barrel 20 flows into the mixing chamber 31 from the chemical agent inlet 32, or the mixing tank 30 seals the chemical agent inlet 32.

[0034] During operation, different chemical agents are respectively transported into at least two chemical agent barrels 20, and the sewage is transported into the mixing tank 30 through the sewage barrel 12. Then, the mixing tank 30 is driven to rotate by the rotation driving device 40. When the chemical agent inlet 32 completely or partially overlaps with the lower opening of the chemical agent barrel 20, the chemical agents in at least two chemical agent barrels 20 flow into the mixing tank 30 simultaneously, improving the chemical agent adding efficiency. This device can control the chemical agents in at least two chemical agent barrels 20 to be stored in the chemical agent barrels 20 or flow into the mixing tank 30 to be mixed with the sewage only through the rotation driving device 40, simplifying the control steps. At the same time, it has the advantages of low cost and convenient use. By driving the rotation angle of the mixing tank 30 by the rotation driving device 40, the overlapping area between the chemical agent inlet 32 and the lower opening of the chemical agent barrel 20 is controlled to control the flow rate of the chemical agent, avoiding the problems of poor treatment effect or waste of chemical agent caused by excessive addition of chemical agent.

[0035] As Figure 3 shown, in order to enable the mixing tank 30 to rotate inside the accommodating chamber 11, a plain bearing 50 is sleeved on the lower end of the sewage barrel 12. The upper end of the plain bearing 50 is fixed to the mixing tank 30, and its lower end is fixed to the sewage barrel 12, which can enable the mixing tank 30 to rotate well. The sewage barrel 12 plays a supporting role for the mixing tank 30.

[0036] As Figure 4 shown, the rotation driving device 40 includes a first motor 41 installed on the outer wall of the processing tank 10. The output shaft of the first motor 41 extends into the accommodating chamber 11 and is connected with a speed reducer 42. The output end of the speed reducer 42 is fixedly connected with a gear 44 through a driving shaft 43. A gear ring 45 is meshed with the gear 44, and the gear ring 45 is fixed on the mixing tank 30. When the first motor 41 works, through the speed reduction effect of the speed reducer 42, the gear 44 drives the mixing tank 30 to rotate slowly through the gear ring 45, so that the chemical agent inlet 32 overlaps or does not overlap with the lower opening of the chemical agent barrel 20.

[0037] As Figure 5 shown, a drain port 33 is connected to the bottom of the mixing tank 30, and a solenoid valve 34 is installed on the drain port 33. By opening the solenoid valve 34, the mixed medicament and sewage in the mixing tank 30 can be discharged.

[0038] As Figure 2 shown, a filter screen 60 is provided below the drain port 33. The filter screen 60 divides the accommodation chamber 11 into an upper chamber 111 and a lower chamber 112. By providing the filter screen 60, some agglomerated medicaments, or residual impurities in the sewage or impurities formed by the reaction of the medicament and sewage can be filtered out. The mixed medicament and sewage in the mixing tank 30 flow through the filter screen and into the interior of the lower chamber 112.

[0039] As Figure 2 shown, it further includes a stirring device 70. The stirring device 70 includes a second motor 71 fixedly installed at the bottom end of the treatment tank 10, a stirring rod 72 connected to the output end of the second motor 71 and extending upward, and a first stirring blade 73 and a second stirring blade 74 installed on the stirring rod 72. The first stirring blade 73 is located inside the mixing chamber 31, and the second stirring blade 74 is located inside the lower chamber 112. The second motor 71 drives the first stirring blade 73 and the second stirring blade 74 to rotate through the stirring rod 72. The first stirring blade 73 can stir the sewage and medicament inside the mixing chamber 31, and the second stirring blade 74 can perform secondary stirring on the sewage inside the lower chamber 112, effectively avoiding the problem of uneven mixing of the sewage and medicament inside the mixing tank 30 and improving the mixing effect of the sewage and the medicament.

[0040] As Figure 3 shown, a first sealing bearing 80 is installed at the bottom of the mixing tank 30, and a second sealing bearing 90 is installed on the filter screen 60, and both the first sealing bearing 80 and the second sealing bearing 90 are sleeved outside the stirring rod 72.

[0041] Specifically, a discharge port 13 is further provided on the lower side wall of the treatment tank 10, and a drain valve 14 is provided on the discharge port 13.

[0042] As Figure 9Another embodiment of the present invention is shown. On the basis of the above embodiment, a chemical dosing pipe 100 is provided on the chemical dosing barrel 20. One end of the chemical dosing pipe 100 is connected to a chemical dosing pump (not shown in the figure). A sewage pipe 110 is provided on the sewage barrel 12. One end of the sewage pipe 110 is connected to a sewage pump (not shown in the figure). A first flow meter 120 is installed on the chemical dosing pipe 100 to obtain the dosage of chemicals added to the chemical dosing barrel 20. The sewage pipe 110 is connected to a second flow meter 130 to obtain the amount of sewage added into the mixing tank 30. The first flow meter 120 and the second flow meter 130 are respectively connected to a PLC controller (not shown in the figure), and the chemical dosing pump and the sewage pump are respectively electrically connected to the PLC controller. The PLC can calculate the required dosage of chemicals and can also calculate the amount of sewage flowing into the mixing tank 30 through the sewage pipe 110. By calculating the mixing ratio of the chemical dosage and the sewage amount in advance, when the dosage of chemicals added to the chemical dosing barrel 20 reaches the threshold, the PLC controller shuts off the chemical dosing pump. Similarly, when the amount of sewage flowing into the mixing tank 30 reaches the threshold, the PLC controller automatically shuts off the sewage pump, realizing the precise mixing of the chemicals and the sewage.

[0043] In the description of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sewage treatment device that calculates the chemical dosing amount using a PLC, characterized in that, it includes: A treatment tank (10), which has an accommodation chamber (11) inside, and the top wall of the treatment tank (10) extends downward to form a sewage cylinder (12); At least two chemical agent barrels (20), the chemical agent barrels (20) are cylindrical structures with openings at both the upper and lower ends, and the lower ends of the chemical agent barrels (20) extend into the interior of the accommodation chamber (11); A mixing tank (30), a mixing chamber (31) communicating with the sewage cylinder (12) is provided inside the mixing tank (30), a chemical agent inlet (32) is provided at the top of the mixing tank (30), the number of the chemical agent inlets (32) is the same as the number of the chemical agent barrels (20), a rotation driving device (40), the rotation driving device (40) is used to drive the mixing tank (30) to rotate, so that the chemical agent inlets (32) and the chemical agent barrels (20) are in one-to-one correspondence, the chemical agent in the chemical agent barrel (20) flows into the mixing chamber (31) from the chemical agent inlet (32), or the mixing tank (30) closes the chemical agent inlet (32); A plain bearing (50) is sleeved at the lower end of the sewage cylinder (12), the upper end of the plain bearing (50) is fixed to the mixing tank (30), the rotation driving device (40) includes a first motor (41) installed on the outer wall of the treatment tank (10), the output shaft of the first motor (41) extends into the interior of the accommodation chamber (11) and is connected with a speed reducer (42), the output end of the speed reducer (42) is fixedly connected with a gear (44) through a driving shaft (43), a gear ring (45) is meshed with the gear (44), the gear ring (45) is fixed on the mixing tank (30), a drain port (33) is connected to the bottom of the mixing tank (30), a solenoid valve (34) is installed on the drain port (33), a filter screen (60) is arranged below the drain port (33), the filter screen (60) divides the accommodation chamber (11) into an upper chamber (111) and a lower chamber (112), and further includes a stirring device (70), the stirring device (70) includes a second motor (71) fixedly installed at the bottom end of the treatment tank (10), a stirring rod (72) connected to the output end of the second motor (71) and extending upward, and a first stirring blade (73) and a second stirring blade (74) installed on the stirring rod (72), the first stirring blade (73) is located inside the mixing chamber (31), and the second stirring blade (74) is located inside the lower chamber (112).

2. The sewage treatment device that calculates the chemical dosing amount using a PLC according to claim 1, characterized in that, A first sealing bearing (80) is installed at the bottom of the mixing tank (30), a second sealing bearing (90) is installed on the filter screen (60), and both the first sealing bearing (80) and the second sealing bearing (90) are sleeved outside the stirring rod (72).

3. The sewage treatment device that calculates the chemical dosing amount using a PLC according to claim 1, characterized in that, A discharge port (13) is further provided on the lower side wall of the treatment tank (10), and a drain valve (14) is provided on the discharge port (13).

4. A sewage treatment device for calculating the chemical dosing amount by using a PLC according to claim 1, characterized in that a chemical dosing pipe (100) is provided on the chemical dosing tank (20), a sewage pipe (110) is provided on the sewage tank (12), a first flow meter (120) is installed on the chemical dosing pipe (100) to obtain the chemical dosing amount added to the chemical dosing tank (20), and the sewage pipe (110) is connected with a second flow meter (130) to obtain the sewage amount added to the inside of the mixing tank (30).

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