Pre-stirring automatic control device for stable feeding of filter press

Abstract

The utility model relates to an automatic premixing control device for stable feeding of a filter press, which comprises a stirring tank, the stirring tank is arranged between an underflow pipe of a concentration tank and a slurry supply pump of the filter press, and the underflow pipe of the concentration tank is provided with a concentration meter, a flow meter I and an electromagnetic valve; a water supplementing pipe is connected to the side lower portion of the stirring tank, a second flow meter and an electric control valve are installed on the water supplementing pipe, a stirring mechanism is installed on the top of the stirring tank, a liquid level detection device is installed on the side, away from the stirring mechanism, of the stirring tank, and the concentration meter, the first flow meter, the electromagnetic valve, the second flow meter, the electric control valve and the liquid level detection device are all electrically connected with the PLC. The device realizes stable feeding and uniform mixing of materials through multiple functions of automatic control, stable concentration adjustment, accurate liquid level control, stirring effect optimization and the like, provides a powerful guarantee for efficient operation of the filter press, remarkably improves the filter pressing efficiency and the product quality, reduces equipment abrasion and energy consumption, and reduces the production cost. And the method has relatively high economic and social benefits.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter press feeding technology field, concretely relates to a kind of pre-stirring automatic control device of stable feeding of filter press. BACKGROUND

[0002] As a kind of equipment widely used in solid-liquid separation, filter press usually needs to experience the steps such as feeding, backwashing, back blowing, air drying and unloading in the filtration production process.The feeding mode of traditional filter press is usually to directly connect the thickener underflow into the slurry pump of filter press for feeding.However, this direct feeding mode has many disadvantages:

[0003] (1) the concentration of thickener underflow fluctuates greatly: when temporarily stopping or the material in thickener is accumulated, the concentration of underflow will increase rapidly.This leads to the slurry pump load being too large at the beginning of feeding, and the motor is high temperature or even burned.After feeding is completed, the high-concentration material will fill the pump cavity again, making it difficult for the slurry pump to start next time, and even damaging the slurry pump in serious cases.

[0004] (2) high risk of feeding pipe blockage: high-concentration feeding can easily cause blockage of the filter press feeding pipe, making it difficult for subsequent backwashing and back blowing operations.If the feeding pipe is not cleaned during backwashing and back blowing, the feeding pipe will be completely blocked during the next feeding, causing equipment failure and shutdown.

[0005] (3) uneven distribution of material: in the middle and later stages of feeding, the concentration of material will decrease significantly (5%~10%), leading to inconsistent concentration of material in the front and rear sections of the filter chamber of filter press.This uneven distribution of material not only affects the extrusion dewatering effect during the feeding stage, leading to increased moisture content of filter cake, but also causes air pressure short circuit between different filter plates in the filter chamber during the subsequent air drying stage.Compressed air directly flows from the filter cake that is not compacted in the low-concentration feeding area, further reducing the air drying effect and leading to increased moisture content of filter cake.

[0006] (4) poor production continuity: the fault handling caused by the above problems will lead to production interruption, which cannot realize continuous production, and seriously affects production efficiency and economic benefits.

[0007] To solve the above problems, the utility model increases a pre-stirring device for stable feeding before the slurry pump of filter press feeds.Through automatic control of the material level and concentration before the slurry pump feeds, the problems of feeding pipe blockage, high equipment failure rate, discontinuous production and increased moisture content of filter cake caused by unstable feeding concentration are effectively solved, thereby improving the operation efficiency and production stability of filter press. SUMMARY

[0008] The utility model provides a kind of pre-stirring automatic control device of stable feeding of filter press.

[0009] The specific technical scheme is: a pre-stirring automatic control device for stable feeding of a filter press, comprising a stirring tank, the stirring tank is arranged between a thickener underflow pipe and a slurry pump of the filter press, a concentration meter, a flow meter one and an electromagnetic valve are arranged on the thickener underflow pipe, a water supplement pipe is connected to the lower side of the stirring tank, a flow meter two and an electric regulating valve are arranged on the water supplement pipe, a stirring mechanism is arranged on the top of the stirring tank, a liquid level detection device is arranged on the side away from the stirring mechanism, and the concentration meter, the flow meter one, the electromagnetic valve, the flow meter two, the electric regulating valve and the liquid level detection device are electrically connected with a PLC controller.

[0010] Further, preferably, the liquid level detection device comprises a support, the support is arranged on the side wall of the top of the stirring tank, two limiting rings are arranged on the support, a connecting rod is slidably arranged in the limiting rings, a float is connected to the bottom of the connecting rod, a sensor is arranged on the upper section of the connecting rod, and an upper limit sensor and a lower limit sensor are arranged on the support; the sensor, the upper limit sensor and the lower limit sensor are electrically connected with the PLC controller.

[0011] Further, preferably, a flow stabilizing pipe is further sleeved on the outer periphery of the connecting rod and the float, and the top of the flow stabilizing pipe is connected to the inner side of the platform on the top of the stirring tank.

[0012] Further, preferably, a plurality of turbulence plates with different heights are arranged on the bottom of the stirring tank.

[0013] The pre-stirring automatic control device for stable feeding of the filter press has multiple functions such as automatic control, stable concentration adjustment, accurate liquid level control and optimized stirring effect, realizes stable feeding and uniform mixing of the material, provides a powerful guarantee for efficient operation of the filter press, significantly improves the filter pressing efficiency and product quality, reduces equipment wear and energy consumption, and has high economic and social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Fig. 1 is a structural schematic view of the pre-stirring automatic control device for stable feeding of the filter press according to the present application;

[0015] In the figure, 1 is a thickener underflow pipe, 11 is a concentration meter, 12 is a flow meter one, and 13 is an electromagnetic valve; 2 is a stirring tank; 3 is a slurry pump of the filter press; 4 is a water supplement pipe, 41 is a flow meter two, and 42 is an electric regulating valve; 5 is a stirring mechanism; 6 is a liquid level detection device, 61 is a support, 62 is a limiting ring, 63 is a connecting rod, 64 is a float, 65 is a sensor, 66 is an upper limit sensor, 67 is a lower limit sensor, and 68 is a flow stabilizing pipe; 7 is a turbulence plate; and 8 is a PLC controller. DETAILED DESCRIPTION

[0016] In order to make the technical problems and technical solutions solved by the utility model more clear and explicit, the utility model is further described in detail below in combination with the drawings and examples.

[0017] In the description of the utility model, it needs to be understood that the orientation or position relation indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0018] In the description of the utility model, it also needs to be explained that, unless explicitly specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements, and the specific meaning of the above terms in the utility model can be understood according to the specific circumstances for the ordinary skilled in the art.

[0019] As shown in Figure 1 A kind of pre-stirring automatic control device of pressure filter stable feeding, including stirring tank 2, stirring tank 2 is arranged between thickening pool underflow pipe 1 and pressure filter slurry pump 3, thickening pool underflow pipe 1 is connected at the top feed inlet of stirring tank 2, and pressure filter slurry pump 3 is connected at the discharge port below stirring tank 2.

[0020] Concentration meter 11, flowmeter one 12 and solenoid valve 13 are installed on thickening pool underflow pipe 1;Supplementing pipe 4 is connected to the side below stirring tank 2, flowmeter two 41 and electric regulating valve 42 are installed on supplementing pipe 4, stirring mechanism 5 is installed on the top of stirring tank 2, liquid level detection device 6 is installed on the side away from stirring mechanism 5, and concentration meter 11, flowmeter one 12, solenoid valve 13, flowmeter two 41, electric regulating valve 42 and liquid level detection device 6 are electrically connected with PLC controller 8.

[0021] As a preferred scheme of the embodiment, the liquid level detection device 6 includes a bracket 61 mounted on the side wall of the top of the stirring tank 2, two limit rings 62 are provided on the bracket 61, a connecting rod 63 is slidably arranged in the limit rings 62, a float ball 64 is connected to the bottom of the connecting rod 63, a sensor 65 is mounted on the upper segment of the connecting rod 61, an upper limit sensor 66 and a lower limit sensor 67 are also mounted on the bracket 61, and the sensor 65, the upper limit sensor 66 and the lower limit sensor 67 are electrically connected with the PLC controller 8.

[0022] Further, the connecting rod 63 and the outer periphery of the floating ball 64 are further sleeved with a flow stabilizing pipe 68, the top of the flow stabilizing pipe 68 is connected to the inner side of the top platform of the stirring tank 2. The flow stabilizing pipe 68 can effectively isolate the fluctuations generated by stirring, feeding or discharging operations, and provide a relatively stable environment for the floating ball 64 and the connecting rod 63, so that they move smoothly in the vertical direction only, avoid false triggering signals caused by shaking of the floating ball when the liquid level fluctuates, and improve the accuracy of liquid level detection.

[0023] As a further preferred scheme of the embodiment, the stirring tank 2 is provided with a plurality of baffles 7 with different heights at the bottom. The design of the baffles 7 can increase the collision and mixing between the materials, re-suspend the precipitated materials, prevent accumulation at the bottom, reduce the stirring dead angle, and ensure uniform mixing of the materials, thereby providing stable and uniform material supply for subsequent pressure filtration.

[0024] Working principle: The concentrated pool bottom flow pipe 1 transports the materials in the concentrated pool to the stirring tank 2. In this process, the concentration meter 11 and the flow meter 12 detect the concentration and flow rate of the materials in real time, and the electromagnetic valve 13 controls the on-off of the materials according to the instructions of the PLC controller 8.

[0025] After the materials enter the stirring tank 2, the stirring mechanism 5 is started at random to stir the materials to ensure uniform mixing of the materials. At the same time, the PLC controller 8 adjusts the opening degree of the electric regulating valve 42 on the water supplement pipe 4 according to the concentration and flow rate information of the materials fed back by the concentration meter 11 and the flow meter 12, and further adjusts the water supplement amount fed back by the flow meter 41. Under the synergistic action of stirring and water supplement, the concentration of the materials is adjusted in real time to the set value suitable for pressure filtration, and then the slurry pump 3 of the pressure filter is started to stably transport the adjusted materials to the pressure filter for subsequent pressure filtration.

[0026] During the process of transferring the materials into the pressure filter, the liquid level detection device 6 monitors the liquid level height in the stirring tank 2 in real time. The floating ball 64 floats up and down with the liquid level, driving the connecting rod 63 and the inductor 65 installed on the upper part thereof to slide up and down in the limiting ring 62. The inductor 65, the upper limit inductor 66 and the lower limit inductor 67 detect the real-time height of the liquid level respectively, and transmit signals to the PLC controller 8. When the liquid level decreases to the lower limit, the PLC controller 8 controls the electromagnetic valve 13 to open the feeding and the electric regulating valve 42 to open the water supplement; when the liquid level reaches the upper limit, the PLC controller 8 controls the electromagnetic valve 13 to close the feeding, or adjusts the electric regulating valve 42 to reduce the water supplement, so as to ensure that the liquid level in the stirring tank 2 is kept within a reasonable range.

[0027] The whole process is automatically executed through preset program, and stable feeding of materials, concentration adjustment, liquid level control and uniform stirring are accurately completed, so that stable material supply is provided for efficient operation of the filter press, and the filter pressing efficiency and product quality are improved.

[0028] The utility model is described in detail above through specific and preferred embodiments, but the person skilled in the art should understand that the utility model is not limited to the above-mentioned embodiments, and any modification, equivalent replacement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An automatic pre-stirring control device for stable feeding of a filter press, characterized in that: The system includes a stirring tank (2), which is located between the underflow pipe (1) of the thickening tank and the slurry pump (3) of the filter press. A concentration meter (11), a flow meter (12) and a solenoid valve (13) are installed on the underflow pipe (1) of the thickening tank. A water supply pipe (4) is connected to the lower side of the stirring tank (2). A flow meter (41) and an electric regulating valve (42) are installed on the water supply pipe (4). A stirring mechanism (5) is installed on the top of the stirring tank (2). A liquid level detection device (6) is installed on the side away from the stirring mechanism (5). The concentration meter (11), flow meter (12), solenoid valve (13), flow meter (41), electric regulating valve (42) and liquid level detection device (6) are all electrically connected to a PLC controller (8).

2. The pre-stirring automatic control device for stable feeding of a filter press according to claim 1, characterized in that: The liquid level detection device (6) includes a bracket (61), which is installed on the side wall of the top of the stirring tank (2). Two limiting rings (62) are provided on the bracket (61). A connecting rod (63) is slidably arranged in the limiting ring (62). A float ball (64) is connected to the bottom of the connecting rod (63). A sensor (65) is installed on the upper section of the connecting rod (63). An upper limit sensor (66) and a lower limit sensor (67) are also installed on the bracket (61). The sensor (65), the upper limit sensor (66) and the lower limit sensor (67) are all electrically connected to the PLC controller (8).

3. The pre-stirring automatic control device for stable feeding of a filter press according to claim 2, characterized in that: The connecting rod (63) and the float (64) are also fitted with a flow stabilizing pipe (68), the top of which is connected to the inner side of the top platform of the stirring tank (2).

4. The pre-stirring automatic control device for stable feeding of a filter press according to any one of claims 1-3, characterized in that: The bottom of the mixing tank (2) is provided with multiple baffles (7) of different heights.

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