A device and method for precise feed control of a centrifuge

Abstract

The application discloses a kind of for centrifuge accurate feed control device, comprising: valve group, power element, flowmeter and control module;Power element is connected with the pipeline of one end of flowmeter, controlled by control module for absorbing raw material or lye or water from outside and transported to flowmeter;The other end of flowmeter is connected with the pipeline of valve group, for measuring the content of liquid passing through flowmeter and uploaded to control module;Two ends of valve group are respectively connected with the pipeline of centrifuge and flowmeter, controlled by control module to select corresponding valve to transport raw material or lye or water output by flowmeter to centrifuge;Control module is used to analyze the data uploaded by flowmeter, and based on preset strategy, valve group and power element control are realized batch feeding.This application realizes accurate control effect by feeding amount.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of industrial automatic control, and particularly relates to a device and method for precise feeding control of a centrifuge. BACKGROUND

[0002] A centrifuge is mainly used for separating solid particles from liquid in a suspension, and is a machine for separating different components in a liquid-solid mixture or a liquid mixture by using centrifugal force. The core component of the centrifuge is a drum, which is a cylinder rotating at high speed around its own axis, usually driven by a motor. After the solid-liquid mixture enters the drum, it is rapidly driven to rotate at the same speed as the drum, and the solid-liquid mixture is separated under the action of centrifugal force. The solid particles are intercepted on the inner wall of the drum, and the liquid is discharged from the centrifuge.

[0003] In the past, feeding of a centrifuge was only controlled by using feeding time as a control point and a PLC system. However, there are several problems in using the traditional method of controlling feeding by controlling feeding time: (1) Since the concentrations of different batches of metal salts are different, the feeding amount controlled by the feeding time method has a large deviation, which affects the product quality; (2) For the centrifuge itself, since the processing capacity of a single batch is small, generally 200-400 kg, the feeding amount controlled by the feeding time method has a certain risk to the load of the centrifuge itself; (3) For process operators, due to the influence of actual working conditions, the accuracy of feeding time estimation is not high, and it is easy to overfeed or underfeed, which needs to be corrected multiple times, thereby affecting production efficiency. SUMMARY

[0004] The technical purpose of the present application is to provide a device and method for precise feeding control of a centrifuge to solve the problem of low feeding precision in the prior art.

[0005] To solve the above problems, the technical solution of the present application is as follows: a device for precise feeding control of a centrifuge, comprising: a valve group, a power component, a flow meter and a control module;

[0006] The power component is connected to one end of the flow meter through a pipeline and is controlled by the control module to absorb raw materials or alkali liquor or water from the outside and deliver them to the flow meter;

[0007] The other end of the flow meter is connected to the valve group through a pipeline, and is used to measure the content of the liquid passing through the flow meter and upload it to the control module;

[0008] The two ends of the valve group are respectively connected to the centrifuge and the flow meter through pipelines, and are controlled by the control module to select the corresponding valve to deliver the raw materials or alkali liquor or water output by the flow meter to the centrifuge;

[0009] The control module is used to analyze the data uploaded by the flow meter, and controls the valve group and the power component based on a preset strategy to realize batch feeding.

[0010] The control module is wirelessly connected with the power unit, the flow meter and the valve group respectively.

[0011] Specifically, the power unit is a pneumatic diaphragm pump.

[0012] The valve group comprises a feed valve, a lye inlet valve and a hot water inlet valve.

[0013] The feed valve is used for inputting raw materials into the centrifuge.

[0014] The lye inlet valve is used for inputting lye into the centrifuge.

[0015] The hot water inlet valve is used for inputting hot water into the centrifuge for cleaning.

[0016] Further preferably, the device further comprises a slurry outlet valve, a flushing water valve, a primary mother liquor outlet valve, a filtered mother liquor outlet valve and a washing water outlet valve controlled by the control module.

[0017] The slurry outlet valve is arranged between the power unit and the outside, and is used for inputting raw materials from the outside into the power unit.

[0018] The flushing water valve is arranged between the power unit and the outside, and is used for inputting water from the outside into the power unit.

[0019] The primary mother liquor outlet valve is arranged at the outlet of the centrifuge, and is used for discharging the liquid of the raw materials out of the centrifuge.

[0020] The filtered mother liquor outlet valve is arranged at the outlet of the centrifuge, and is used for discharging the liquid of the raw materials out of the centrifuge.

[0021] The washing water outlet valve is arranged at the outlet of the centrifuge, and is used for discharging the waste liquid washed by water out of the centrifuge.

[0022] A method for precise feed control of a centrifuge, applied to the device for precise feed control of a centrifuge according to any one of the above, comprises the following steps:

[0023] S1: obtaining a request feed signal, sequentially opening the primary mother liquor outlet valve, the feed valve, the slurry outlet valve and the pneumatic diaphragm pump related to the feed, realizing raw material feeding, and automatically sending a feed completion signal when a preset threshold is reached, and completing the feed;

[0024] S2: obtaining a request lye signal, sequentially opening the filtered mother liquor outlet valve, the lye inlet valve and the pneumatic diaphragm pump related to the lye, realizing lye feeding, and automatically sending a lye completion signal when a preset threshold is reached, and completing the lye feeding;

[0025] S3: obtaining a water signal, opening the washing water outlet valve related to water washing, closing the filtered mother liquor outlet valve, and then opening the hot water inlet valve, performing water washing, and automatically sending a water completion signal when a preset threshold is reached, and completing the cleaning.

[0026] Specifically, in step S1,

[0027] In the flow mode, when the flow cumulative value is equal to the feeding >= (total flow setting of the feed / feed frequency setting), the pneumatic diaphragm pump is closed.

[0028] After the time reaches the feeding interval time, the pneumatic diaphragm pump is opened again, and the feeding and pausing in steps 6-8 are executed in a cycle until the cycle feeding frequency reaches the preset feeding frequency, and the slurry outlet valve is closed.

[0029] Further preferably, step S1 further comprises,

[0030] The flushing water valve and the pneumatic diaphragm pump related to cleaning are opened in sequence, and pipeline flushing is performed; after the time reaches the preset time, the pneumatic diaphragm pump, the flushing water valve and the feeding valve are closed, so that the feeding is completed.

[0031] Specifically, in step S2,

[0032] In the flow mode, when the flow cumulative value is equal to the liquid feeding >= (total flow setting of the liquid / liquid feeding frequency setting), the alkali inlet valve is closed.

[0033] After the time reaches the alkali feeding interval time, the alkali inlet valve is opened again, and the liquid feeding and pausing in steps 11-12 are executed in a cycle until the cycle liquid feeding frequency reaches the preset liquid feeding frequency, and the alkali inlet valve is closed, so that the liquid feeding is completed.

[0034] Specifically, in step S3,

[0035] In the flow mode, the flow cumulative value is equal to the water feeding >= (total flow setting of the water / water feeding frequency setting), and the hot water inlet valve is closed.

[0036] After the time reaches the water feeding interval time, the hot water inlet valve is opened again, and the water feeding and pausing in steps 15-16 are executed in a cycle until the cycle water feeding frequency reaches the preset water feeding frequency, and the hot water inlet valve and the washing water outlet valve are closed, so that the water feeding and cleaning are completed.

[0037] Compared with the prior art, the present application has the following advantages and positive effects: The present application can be applied to various centrifuge feeding control industrial scenes, and precise control can be realized according to the feeding amount. The pneumatic valve and the diaphragm pump can be controlled by flow accumulation, automatic and precise control is realized, the centrifuge adds the material according to the set total amount and the set frequency. The efficiency of centrifuge feeding can be improved, and the material feeding deviation is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not considered a limitation of the present application.

[0039] Figure 1 A structural diagram of a precise feeding control device for a centrifuge according to the present application;

[0040] Figure 2 A precise feeding control method for a centrifuge according to the present application;

[0041] Figure 3 An operation screen diagram of a control module according to the present application;

[0042] Figure 4 An implementation effect diagram of the present application.

[0043] Explanation of reference signs

[0044] 1: centrifuge; 2: valve group; 3: power member; 4: flow meter; 5: control module. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific implementation manners of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained from these drawings, and other embodiments can be obtained without any creative effort.

[0046] In order to make the drawings simple, only the parts related to the present application are shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this document, "one" not only means "only one", but also means "more than one" situation.

[0047] The present application will be further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the present application will be more apparent according to the following description and claims.

[0048] Embodiment 1

[0049] Reference Figure 1 The present embodiment discloses a precise feeding control device for a centrifuge, which mainly comprises: a centrifuge 1 capable of separating components of a liquid mixture, and a valve group 2, a power member 3, a flow meter 4 and a control module 5.

[0050] One end of the power element 3 is connected with the external pipeline to suck in the external liquid mixture or water or alkali solution to be separated, to realize the liquid transmission power in the embodiment, and to flow in the embodiment. The other end of the power element 3 is connected with one end of the flow meter 4 to suck in the raw material or alkali solution or water from the outside and to deliver to the flow meter 4. In the embodiment, the power element 3 is a pneumatic diaphragm pump, which is a new type of conveying machine and uses compressed air as the power source. The pump can extract various corrosive liquids, liquid with particles, high viscosity, volatile, flammable and toxic liquids.

[0051] As described above, one end of the flow meter 4 is connected with the power element 3, and the other end of the flow meter 4 is connected with the valve group 2. The flow meter 4 is an instrument for indicating the measured flow and / or the total amount of fluid in a selected time interval, and is simply an instrument for measuring the flow of fluid in the pipeline.

[0052] The valve group 2 is connected with the centrifuge 1 and the flow meter 4 at both ends. The valve group 2 includes multiple valves, and the opened valves are different according to the raw material or alkali solution or water output by the flow meter 4. The automatic control is realized by opening and closing the valves to achieve precise control.

[0053] The control module 5 is wirelessly connected with the power element 3, the flow meter 4 and the valve group 2. The control module 5 receives and analyzes the data flowing through the flow meter 4, and automatically controls the valve group 2 and the pneumatic diaphragm pump based on the preset automatic control scheme, so as to realize the automatic batch feeding. Of course, the embodiment can also be compatible with manual control feeding.

[0054] Specifically, the valve group 2 includes a feeding valve, an alkali solution inlet valve and a hot water inlet valve, and further includes a slurry outlet valve, a flushing water valve, an initial mother liquor outlet valve, a filtered mother liquor outlet valve and a washing water outlet valve controlled by the control module 5.

[0055] The slurry outlet valve is arranged between the power element 3 and the outside, the feeding valve is the inlet of the centrifuge 1, and the initial mother liquor outlet valve is an outlet of the centrifuge 1. The raw material passes through the slurry outlet valve, the feeding valve and the initial mother liquor outlet valve in sequence and then is discharged from the centrifuge 1.

[0056] The flushing water valve is arranged between the power element 3 and the outside, and the filtered mother liquor outlet valve is an outlet of the centrifuge 1. The water for washing passes through the flushing water valve, the feeding valve and the filtered mother liquor outlet valve in sequence and then is discharged from the centrifuge 1.

[0057] The alkali solution inlet valve is used to input the alkali solution into the centrifuge 1. The alkali solution passes through the alkali solution inlet valve and the filtered mother liquor outlet valve and then is discharged from the centrifuge 1.

[0058] The hot water inlet valve is used to input hot water to the centrifuge 1 for post-dosing cleaning, and the washing water outlet valve is arranged at the outlet of the centrifuge 1, and the hot water is discharged from the centrifuge 1 through the hot water inlet valve and the washing water outlet valve.

[0059] Embodiment 2

[0060] Referring to Figure 2 and Figure 3 , the embodiment provides a precise feeding control method for a centrifuge, which is applied to the precise feeding control device for a centrifuge as in Embodiment 1, and comprises the following steps:

[0061] First, the initial mother liquor time, the feeding time, the total feeding flow, the feeding times, the feeding interval time, the water washing pipeline time, the alkali feeding time, the total alkali feeding flow, the alkali feeding times, the alkali feeding interval time, the water feeding time, the total water feeding flow, the water feeding times and the water feeding interval time are set in advance in the operation picture of the DCS system, i.e. the control module. Figure 3 The settings are made in the monitoring interface column.

[0062] In the Figure 3 , the operator first clicks the "flow" button to enable the centrifuge to add liquid in batches according to the preset flow after the sequence control is started. Otherwise, if the "time" button is selected, the centrifuge will be controlled according to the traditional feeding time after the sequence control is started. The operator clicks the "automatic" button on the communication operation interface on the panel to cut in the remote control of the complete set of equipment, and otherwise, the "manual" button is selected for on-site control. The operator clicks the feeding interface and selects the "automatic" button for the non-stop cycle mode, and otherwise, the "manual" button is selected for the single mode with stop. After the above parameters are set, the operator clicks the "start" button to start the embodiment.

[0063] According to the preset process, a request feeding signal is first obtained, the initial mother liquor outlet valve, the feeding valve, the slurry outlet valve and the pneumatic diaphragm pump related to feeding are opened in sequence to realize the feeding of raw materials. After the initial mother liquor time is reached, the initial mother liquor outlet valve is closed, and then the filtered mother liquor outlet valve is opened. If the flow mode is selected, the pneumatic diaphragm pump is temporarily closed when the flow cumulative value is equal to the feeding >=(total feeding flow setting / feeding times setting). After the feeding interval time (the interval time between two feedings) is reached, the pneumatic diaphragm pump is opened again, and the feeding and pause are executed in cycles 6-8 until the preset feeding times are reached, and then the slurry outlet valve is closed.

[0064] Then, the flushing water valve and the pneumatic diaphragm pump are opened to flush the pipeline, i.e. the residual metal salt solution in the pipeline is completely discharged into the centrifuge. After the water washing pipeline time is reached, the feeding pneumatic diaphragm pump, the flushing water valve and the feeding valve are closed in sequence, and then the feeding completion signal is automatically sent to enter the next step.

[0065] After the completion of the feeding, a request for alkali feeding signal is obtained, and the filter mother liquor outlet valve, the alkali inlet valve and the air-driven diaphragm pump associated with the alkali feeding are opened in sequence to realize the feeding of the alkali. In the flow mode, when the flow cumulative value is equal to the feeding >= (total flow of alkali set / feeding times set), the alkali inlet valve is temporarily closed. After the time reaches the feeding interval, the alkali inlet valve is opened again, and the feeding and the pause in steps 11-12 are executed in a cycle until the cycle feeding times reach the preset feeding times, the alkali inlet valve is closed, and thus the feeding is completed, and a feeding completion signal is automatically sent to the next step.

[0066] After the completion of the alkali feeding, a water feeding signal is obtained, the washing water outlet valve associated with the water feeding is opened, the filter mother liquor outlet valve is closed, and the hot water inlet valve is opened to start the water washing. In the flow mode, when the flow cumulative value is equal to the water feeding >= (total flow of water set / water feeding times set), the hot water inlet valve is temporarily closed.

[0067] After the time reaches the water feeding interval, the hot water inlet valve is opened again, and the water feeding and the pause in steps 15-16 are executed in a cycle until the cycle water feeding times reach the preset water feeding times, the hot water inlet valve and the washing water outlet valve are closed, and thus the water feeding and washing are completed, and a water feeding completion signal is automatically sent.

[0068] In the whole production process, if no operator changes the "automatic-manual" button on the DCS feeding interface, the whole control will always be conditionally judged, and the program will be cyclically executed. In addition, the operator can click the "stop" button at any time to stop the program control.

[0069] Referring to Figure 4 The batch feeding and the precise feeding of the materials are realized by using the automatic control centrifuge precise feeding control effect based on the flow of the embodiment. Different lines represent the flow of the actually fed metal salt, the flow of the actually fed alkali and the flow of the actually fed hot water. It can be seen that the flow of each material feeding process is stable, the cumulative deviation of the feeding of various materials can be effectively controlled within 3KG, and the control precision can reach 99.25%.

[0070] The embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the above-described embodiments. Even if various changes are made to the application, if the changes belong to the scope of the claims of the application and the equivalent technologies, they still fall within the protection scope of the application.

Claims

1. A precision feed control device for a centrifuge, comprising: Comprise: Valve group, power element, flow meter and control module; The power element is connected with one end of the flow meter, and is controlled by the control module to absorb raw materials or lye or water from the outside and transport to the flow meter; The other end of the flow meter is connected with the valve group, which is used to measure the content of the liquid passing through the flow meter and upload to the control module; Both ends of the valve group are respectively connected with the centrifuge and the flow meter, and are controlled by the control module to select the corresponding valve to transport the raw materials or lye or water output by the flow meter to the centrifuge; The control module is used to analyze the data uploaded by the flow meter, and controls the valve group and power element based on the preset strategy to realize batch feeding; The valve group comprises a feeding valve, a lye inlet valve and a hot water inlet valve; The feeding valve is used to input raw materials into the centrifuge; The lye inlet valve is used to input lye into the centrifuge, The hot water inlet valve is used to input hot water into the centrifuge for cleaning; It also includes a slurry outlet valve, a flushing water valve, a primary mother liquor outlet valve, a filtered mother liquor outlet valve and a washing water outlet valve controlled by the control module; The slurry outlet valve is arranged between the power element and the outside, and is used to input raw materials from the outside to the power element; The flushing water valve is arranged between the power element and the outside, and is used to input water from the outside to the power element; The primary mother liquor outlet valve is arranged at the outlet of the centrifuge, which is used to discharge the liquid of raw materials from the centrifuge; The filtered mother liquor outlet valve is arranged at the outlet of the centrifuge, which is used to discharge the liquid of raw materials from the centrifuge; The washing water outlet valve is arranged at the outlet of the centrifuge, which is used to discharge the waste liquid washed by water from the centrifuge; In flow mode, when the flow cumulative value is equal to the feeding >= (total feeding flow rate setting / feeding frequency setting), the power element is closed; After the time reaches the feeding interval time, the power element is opened again, and the feeding and pause are executed 6-8 times in a cycle until the cycle feeding frequency reaches the preset feeding frequency, and the slurry outlet valve is closed; In flow mode, when the flow cumulative value is equal to the liquid input >= (total lye flow rate setting / liquid input frequency setting), the lye inlet valve is closed; After the time reaches the lye input interval time, the lye inlet valve is opened again, and the liquid input and pause are executed 11-12 times in a cycle until the cycle liquid input frequency reaches the preset liquid input frequency, and the lye inlet valve is closed, thereby completing the liquid input; In flow mode, when the flow cumulative value is equal to the water input >= (total water input flow rate setting / water input frequency setting), the hot water inlet valve is closed; After the time reaches the water input interval time, the hot water inlet valve is opened again, and the water input and pause are executed 15-16 times in a cycle until the cycle water input frequency reaches the preset water input frequency, and the hot water inlet valve and the washing water outlet valve are closed, thereby completing the water input cleaning.

2. The precise feed control apparatus for a centrifuge according to claim 1, wherein The control module is wirelessly connected with the power element, the flow meter and the valve group.

3. The precise feed control apparatus for a centrifuge according to claim 1, wherein The power element is a pneumatic diaphragm pump.

4. A method for precise feed control of a centrifuge, characterized by, Comprise the following steps: S1: get request feed signal, open the initial mother liquor outlet valve, feed valve, slurry outlet valve and pneumatic diaphragm pump related to the feed in turn, realize the raw material feeding, and automatically send the feed completion signal after reaching the preset threshold, complete the feeding; S2: get request alkali signal, open the filter mother liquor outlet valve, alkali inlet valve and the pneumatic diaphragm pump related to the alkali feeding in turn, realize the alkali liquid feeding, and automatically send the alkali feeding completion signal after reaching the preset threshold, complete the alkali liquid feeding; S3: get water signal, open the washing water outlet valve related to water washing, close the filter mother liquor outlet valve, and then open the hot water inlet valve, wash with water, and automatically send the water completion signal after reaching the preset threshold, complete the cleaning; In the step S1, In flow mode, when the flow cumulative value is equal to the feeding >= (total flow setting of feeding / feeding frequency setting), the pneumatic diaphragm pump is closed; After the time reaches the feeding interval time, the pneumatic diaphragm pump is opened again, and the feeding and pause are executed 6-8 times in a cycle until the cycle feeding frequency reaches the preset feeding frequency, and then the slurry outlet valve is closed; In the step S1, The rinse water valve related to cleaning and the pneumatic diaphragm pump are opened in turn to flush the pipeline; after the time reaches the preset time, the pneumatic diaphragm pump, the rinse water valve and the feed valve are closed, thereby completing the feeding; In the step S2, In flow mode, when the flow cumulative value is equal to the liquid feeding >= (total flow setting of alkali / liquid feeding frequency setting), the alkali inlet valve is closed; After the time reaches the alkali feeding interval time, the alkali inlet valve is opened again, and the liquid feeding and pause are executed 11-12 times in a cycle until the cycle liquid feeding frequency reaches the preset liquid feeding frequency, and then the alkali inlet valve is closed, thereby completing the liquid feeding; In the step S3, In flow mode, the flow cumulative value is equal to the water feeding >= (total flow setting of water feeding / feeding frequency setting), and the hot water inlet valve is closed; After the time reaches the water feeding interval time, the hot water inlet valve is opened again, and the water feeding and pause are executed 15-16 times in a cycle until the cycle water feeding frequency reaches the preset water feeding frequency, and then the hot water inlet valve and the washing water outlet valve are closed, thereby completing the water feeding and cleaning.

Images