An automatic multi-point dosing mechanism

Abstract

The present application relates to a kind of automated multi-point dosing mechanism, belong to coal separation processing technical field, solve the poor problem of coal slime flotation dosing flow control precision of existing dosing mechanism.The automated multi-point dosing mechanism includes: two ports are set in the bottom of storage tank, respectively as medicine inlet port and medicine outlet port;Medicine inlet device and medicine inlet port are connected, dosing controller makes that medicine passes through medicine inlet port and enters storage tank by controlling medicine inlet device, simultaneously, the height of medicine in storage tank is stabilized during dosing process;One end of medicine outlet device and medicine outlet port are connected, the other end and multiple flotation tanks are connected, dosing controller makes that the medicine passing through medicine outlet port respectively flows to multiple flotation tanks by controlling medicine outlet device, simultaneously, the medicine flow obtained by each flotation tank meets the preset medicine flow of the flotation tank during dosing process.The accurate control of the dosing flow of multiple flotation tanks during dosing process is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal separation processing, and particularly relates to an automatic multi-point dosing mechanism. BACKGROUND

[0002] Coal slime flotation is an important link in coal production, and the way and accuracy of dosing in flotation are important factors affecting the flotation effect.

[0003] Coal slime flotation requires micro-flow dosing, and currently, micro-flow pumps commonly used at home and abroad are mainly metering pumps. The metering pump has high cost and generates pulse flow. The medium viscosity can cause the check valve ball to fail to reset in time, resulting in different degrees of backflow, and the control accuracy of micro-flow is not high. In addition, the feeding pressure of the current dosing control device is unstable, which causes the reagent to fail to fully mix with the ore pulp in the flotation tank, the added reagent is easy to be taken out with the overflowing foam, the ore pulp mineralization effect is poor, and the impurity removal efficiency is low, so that the control effect of the coal preparation plant which has realized automatic flotation control is not ideal.

[0004] Therefore, there is an urgent need for a technical solution that can accurately dose in the coal slime flotation process. SUMMARY

[0005] In view of the above analysis, the embodiments of the present application aim to provide an automatic multi-point dosing mechanism to solve the problem of poor control accuracy of coal slime flotation dosing flow of the existing dosing mechanism.

[0006] The embodiments of the present application provide an automatic multi-point dosing mechanism, which comprises a reagent storage tank, a reagent feeding device, a reagent discharging device, a dosing controller and a reagent discharging controller; two ports are formed at the bottom of the reagent storage tank, which are respectively used as a reagent feeding port and a reagent discharging port;

[0007] The reagent feeding device is connected with the reagent feeding port, and the dosing controller controls the reagent feeding device to make the reagent enter the reagent storage tank through the reagent feeding port, and at the same time, the height of the reagent in the reagent storage tank is stabilized during the dosing process;

[0008] One end of the reagent discharging device is connected with the reagent discharging port, and the other end is connected with a plurality of flotation tanks, and the reagent discharging controller controls the reagent discharging device to make the reagent passing through the reagent discharging port flow to the plurality of flotation tanks, and at the same time, the reagent flow obtained by each flotation tank meets the preset reagent flow of the flotation tank during the dosing process.

[0009] Based on the further improvement of the above-mentioned automatic multi-point dosing mechanism, the reagent feeding device comprises a reagent feeding pipeline, and a first valve switch, a one-way valve and a mechanical diaphragm pump arranged in the reagent feeding pipeline in sequence;

[0010] One end of the reagent feeding pipeline is connected with the reagent feeding port, and the other end is used as a reagent inlet.

[0011] The medicine flows to the input end of the one-way valve under the control of the first valve switch, and the one-way valve is used to control the flow direction of the medicine;

[0012] The medicine flows through the output end of the one-way valve to the input end of the mechanical diaphragm pump;

[0013] A mechanical diaphragm pump is used to pump the medicine into the medicine storage tank through the medicine inlet port.

[0014] Based on the further improvement of the above-mentioned automated multi-point dosing mechanism, a back pressure valve and a first filter are further provided on the drug inlet pipeline;

[0015] The input end of the back pressure valve is connected to the drug inlet port and the output end of the mechanical diaphragm pump at the same time, and the output end of the back pressure valve is connected to the output end of the one-way valve and the input end of the mechanical diaphragm pump;

[0016] The first filter is disposed between the first valve switch and the one-way valve.

[0017] Based on the further improvement of the above-mentioned automated multi-point dosing mechanism, the drug discharging device includes a plurality of first drug discharging branches, the input end of each first drug discharging branch is connected to the drug discharging port, and the output end of each first drug discharging branch is connected to the corresponding flotation tank;

[0018] Each first medicine outlet branch is provided with a second valve switch, a first scalloped flow meter and a first electric needle valve in sequence;

[0019] The first scalloped flowmeter is used to measure the flow of the reagent entering the first reagent outlet branch, and the first electric needle valve controls the flow of the reagent entering the flotation tank.

[0020] Based on the further improvement of the above-mentioned automated multi-point dosing mechanism, the drug discharging device includes a main road, a plurality of third valve switches sequentially arranged on the main road, and a second drug discharging branch with the same number as the third valve switches;

[0021] The main channel is connected to the medicine outlet port;

[0022] The input end of each second medicine outlet branch is connected to the position on the main road corresponding to the output end of the third valve switch;

[0023] A second scalloped flowmeter and a second electric needle valve are sequentially provided on each third medicine outlet branch. The second scalloped flowmeter is used to measure the flow of the medicine entering the corresponding third medicine outlet branch, and the second electric needle valve controls the flow of the medicine entering the flotation tank.

[0024] Based on the further improvement of the above-mentioned automated multi-point dosing mechanism, a second filter is further provided on the main road;

[0025] The second filter is arranged between the medicine outlet port and the first third valve switch.

[0026] Based on the further improvement of the automatic multi-point dosing mechanism, the medicine outlet controller is configured to perform the following steps:

[0027] When the dosing process starts, the initial opening of the second electric needle valve is determined according to the preset reagent flow of each flotation tank and the corresponding flow interaction model, and the initial actual reagent flow of each flotation tank is measured and obtained.

[0028] During the dosing process, the actual reagent flow of each flotation tank is measured and obtained by the second circular-tooth flow meter, and the opening of the second electric needle valve is adjusted according to the comparison result of the actual reagent flow and the preset reagent flow until the actual reagent flow and the preset reagent flow meet the flow error threshold.

[0029] Based on the further improvement of the automatic multi-point dosing mechanism, the dosing controller is configured to perform the following steps:

[0030] Before the dosing process starts, the initial motor speed of the mechanical diaphragm pump is determined according to the preset reagent flow of each flotation tank, so that the height of the reagent in the reagent storage tank reaches the target height.

[0031] During the dosing process, the motor speed of the mechanical diaphragm pump is adjusted according to the actual reagent flow of each flotation tank, the target height and the actual height of the reagent storage tank, so that the actual height of the reagent storage tank is stabilized at the target height.

[0032] Based on the further improvement of the automatic multi-point dosing mechanism, the flow interaction model is determined by the following steps:

[0033] The opening of each second electric needle valve is adjusted from fully closed to fully open, so that the opening of the second electric needle valve traverses all opening combinations, and the reagent flow data of the corresponding flotation tank of each second electric needle valve under each combination is obtained.

[0034] The reagent flow data is fitted to obtain the relationship between the reagent flow of all flotation tanks and the opening of all second electric needle valves as the flow interaction model.

[0035] Based on the further improvement of the automatic multi-point dosing mechanism, the dosing controller and the medicine outlet controller both adopt S7-200SMART model.

[0036] Compared with the prior art, the present application can at least achieve one of the following beneficial effects:

[0037] 1. The medicine feeding device is connected to the medicine feeding port of the medicine storage box to pump the medicine into the medicine storage box for storage. The medicine discharging device is connected to the medicine discharging port of the medicine storage box and adds the medicine to multiple flotation cells. Combined with the control of the medicine discharging device by the medicine discharging controller, the medicine flow rate entering the multiple flotation cells meets the preset flow rate requirements of each flotation cell, thereby improving the accuracy of flow control. At the same time, the control of the medicine feeding device by the medicine dosing controller ensures that the medicine height in the medicine storage box is maintained stable, so that the medicine added to the flotation cell can be fully mixed with the ore pulp, and the mineralization effect is good.

[0038] 2. Impurities contained in the reagent are filtered through the first filter and the second filter, thereby improving the purity of the reagent, making the reagent flow rate added to multiple flotation cells more meet the demand, and improving the flotation effect;

[0039] 3. By determining the initial opening of the second electric needle valve at the beginning of the dosing process through feedforward control, combined with the feedback control of adjusting the second electric needle valve according to the actual reagent flow rate and the preset reagent flow rate of the flotation cell during the dosing process, the reagent flow rate added to each flotation cell can meet the preset flow rate requirements of each flotation cell as much as possible, further improving the dosing accuracy.

[0040] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0042] Figure 1 This is one of the structural diagrams of an automated multi-point dosing mechanism provided by an embodiment of the present invention;

[0043] Figure 2 This is a second structural diagram of an automated multi-point dosing mechanism provided by an embodiment of the present invention;

[0044] Figure 3 A logic flow chart of a dosing controller and a dispensing controller of an automated multi-point dosing mechanism provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0046] A specific embodiment of the present invention discloses an automated multi-point dosing mechanism, such as Figure 1 As shown, the automated multi-point dosing mechanism includes a medicine storage box, a medicine feeding device, a medicine discharging device, a medicine feeding controller, and a medicine discharging controller; two ports are opened at the bottom of the medicine storage box, serving as a medicine feeding port and a medicine discharging port respectively;

[0047] The medicine feeding device is connected to the medicine feeding port, and the medicine feeding controller controls the medicine feeding device to allow the medicine to enter the medicine storage box through the medicine feeding port, while at the same time making the height of the medicine in the medicine storage box stable during the medicine feeding process;

[0048] One end of the drug discharging device is connected to the drug discharging port, and the other end is connected to multiple flotation cells. The drug discharging controller controls the drug discharging device so that the drug passing through the drug discharging port flows to multiple flotation cells respectively. At the same time, during the drug adding process, the drug flow obtained by each flotation cell meets the preset drug flow of the flotation cell.

[0049] Specifically, such as Figure 1 As shown, the dosing controller controls the drug feeding device so that the drug enters the drug storage box through the drug feeding port of the drug storage box for storage. The drug discharging controller controls the drug discharging device so that the drug flow rate in the drug storage box flows to each flotation cell respectively to meet the preset drug flow rate of the corresponding flotation cell, so that each flotation cell can obtain a matching preset flow rate drug, so that the drug in each flotation cell can be fully mixed with the slurry in the flotation cell surface.

[0050] Specifically, such as Figure 1 As shown, the preset flow rate of reagents in each flotation cell can be reasonably set according to actual conditions, and can be the same or different, so that the automated multi-point dosing mechanism provided by the present invention has a wide range of applications.

[0051] Specifically, such as Figure 1 As shown, during the dosing process, the high stability of the reagent in the reagent storage box can stabilize the pressure of the reagent entering the flotation cell, improve the mixing degree of the reagent with the slurry of each flotation cell, and reduce the amount of reagent carried out with the foam.

[0052] Specifically, such as Figure 2 As shown, the drug feeding device includes a drug feeding pipeline, and a first valve switch, a one-way valve and a mechanical diaphragm pump sequentially arranged in the drug feeding pipeline;

[0053] One end of the drug feeding pipe is connected to the drug feeding port, and the other end serves as the drug feeding end;

[0054] The medicine flows to the input end of the one-way valve under the control of the first valve switch, and the one-way valve is used to control the flow direction of the medicine;

[0055] The medicine flows through the output end of the one-way valve to the input end of the mechanical diaphragm pump;

[0056] A mechanical diaphragm pump is used to pump the medicine into the medicine storage tank through the medicine inlet port.

[0057] Preferably, the drug inlet pipeline is further provided with a back pressure valve and a first filter;

[0058] The input end of the back pressure valve is connected to the drug inlet port and the output end of the mechanical diaphragm pump at the same time, and the output end of the back pressure valve is connected to the output end of the one-way valve and the input end of the mechanical diaphragm pump;

[0059] The first filter is disposed between the first valve switch and the one-way valve.

[0060] Specifically, such as Figure 2 As shown, the medicine enters the medicine feeding device from the medicine feeding end, and passes through the first valve switch, the first filter, the one-way valve and the mechanical diaphragm pump arranged on the medicine feeding pipeline in sequence. The mechanical diaphragm pump is used to pump the medicine into the medicine storage box through the medicine feeding port for storage.

[0061] Specifically, the first valve switch is used to control whether to add medicine, and the first filter is used to filter the medicine for the first time to play the role of pre-removal of impurities. Preferably, the first filter is a Y-type filter.

[0062] Specifically, under the control of the one-way valve, the medicine can only enter the mechanical diaphragm pump from the upward direction. As the mechanical diaphragm pump works, the medicine enters the medicine inlet port, effectively preventing the medicine from flowing back.

[0063] Specifically, by adjusting the motor speed of the mechanical diaphragm pump, the flow rate of the medicine in the medicine inlet pipe can be adjusted, and the flow rate of the medicine pumped into the medicine storage box can be controlled.

[0064] Specifically, when the medicine dispensing device in the medicine storage box is clogged, the pressure in the medicine inlet pipe below will be too high. To avoid damaging the medicine inlet pipe, a back pressure valve can be installed to effectively reduce the pressure in the medicine inlet pipe below. It is worth noting that the back pressure valve can only flow in one direction, that is, it can only flow from top to bottom, and cannot flow in the opposite direction.

[0065] In one embodiment, the drug discharging device includes a plurality of first drug discharging branches, the input end of each first drug discharging branch is connected to the drug discharging port, and the output end of each first drug discharging branch is connected to a corresponding flotation tank;

[0066] Each first medicine outlet branch is provided with a second valve switch, a first scalloped flow meter and a first electric needle valve in sequence;

[0067] The first circular-tooth flow meter is used for measuring the medicament flow entering the first medicament outlet branch, and the first electric needle valve controls the medicament flow entering the flotation tank.

[0068] Specifically, the input end of each first medicament outlet branch is connected to the medicament outlet port, so that the medicament flow from the medicament outlet port can be evenly directed to different flotation tanks, and the medicament can be quickly and conveniently added to multiple flotation tanks with the same preset medicament flow, so that the medicament can be fully mixed with the ore pulp in the flotation tank.

[0069] Specifically, the second valve switch, the first circular-tooth flow meter and the first electric needle valve arranged in sequence on the first medicament outlet branch can effectively control the medicament entering the first medicament outlet branch, measure the flow and adjust the medicament flow.

[0070] In another embodiment, the medicament outlet device comprises a main channel, a plurality of third valve switches arranged in sequence on the main channel, and a plurality of second medicament outlet branches same in number as the third valve switches;

[0071] The main channel is connected to the medicament outlet port;

[0072] The input end of each second medicament outlet branch is connected to the position of the output end of the corresponding third valve switch on the main channel;

[0073] A second circular-tooth flow meter and a second electric needle valve are arranged in sequence on each third medicament outlet branch, the second circular-tooth flow meter is used for measuring the medicament flow entering the corresponding third medicament outlet branch, and the second electric needle valve controls the medicament flow entering the flotation tank.

[0074] Preferably, a second filter is further arranged on the main channel;

[0075] The second filter is arranged between the medicament outlet port and the first third valve switch.

[0076] Specifically, as shown in Figure 2 , a plurality of third valve switches are arranged in sequence on the main channel of the medicament outlet device, and a plurality of second medicament outlet branches same in number as the third valve switches; the medicament outlet port is connected to the main channel, so that the medicament in the medicament storage tank flows to the main channel, the main channel distributes the medicament to different second medicament outlet branches through the third valve switches, and the medicament enters the flotation tank through the second circular-tooth flow meter and the second electric needle valve in sequence on each second medicament outlet branch.

[0077] Specifically, as shown in Figure 2 , a second filter is further arranged on the main channel, the second filter is used for post-impurity removal, the mesh number of the filter is higher than that of the first filter, and the second electric needle valve and the second circular-tooth flow meter can be effectively prevented from being blocked by the medicament flowing from the medicament outlet port.

[0078] It is worth noting that if Figure 2 and Figure 3 As shown, the medicine storage box is placed at a high position, and the medicine is continuously pumped into the medicine storage box through the medicine feeding device. When medicine addition is required, the medicine is flowed to each flotation tank for addition under the action of gravity through the medicine discharging device.

[0079] Preferably, each second electric needle valve is arranged at the same height, which improves the coordination of different electric needle valves and increases the stability of the drug flow regulation.

[0080] Specifically, a first filter and a second filter are respectively provided in the medicine inlet device and the medicine outlet device, and impurities in the medicine are removed through double filtration.

[0081] Preferably, the medicine dispensing controller is configured to perform the following steps:

[0082] When the dosing process begins, the initial opening of the second electric needle valve is determined according to the preset reagent flow rate of each flotation cell and the corresponding flow interaction model, and the initial actual reagent flow rate of each flotation cell is measured and obtained;

[0083] During the dosing process, the actual reagent flow rate of each flotation cell is measured by the second scalloped flowmeter. Based on the comparison result of the actual reagent flow rate and the preset reagent flow rate, the opening of the second electric needle valve is adjusted until the actual reagent flow rate and the preset reagent flow rate meet the flow error threshold.

[0084] Preferably, the dosing controller is used to perform the following steps:

[0085] Before the dosing process begins, the initial motor speed of the mechanical diaphragm pump is determined according to the preset reagent flow rate of each flotation tank so that the height of the reagent in the storage tank reaches the target height;

[0086] During the dosing process, the motor speed of the mechanical diaphragm pump is adjusted according to the actual reagent flow rate, target height and actual height of the medicine storage box of each flotation cell, so that the actual height of the medicine storage box is stabilized at the target height.

[0087] Specifically, a liquid level gauge may be provided in the medicine storage box to measure the actual height of the medicine in the medicine storage box in real time.

[0088] Preferably, if Figure 2 As shown, a pressure gauge can also be provided at the medicine outlet port, and the actual height of the medicine in the medicine storage box can also be determined by the pressure gauge.

[0089] Specifically, such as Figure 2As shown, before the dosing process begins, the medicine is pumped into the medicine storage box through the medicine feeding device so that the medicine level in the medicine storage box reaches the target height; when the dosing process begins, the medicine enters multiple flotation tanks through the medicine discharging device under the action of gravity.

[0090] Specifically, during the dosing process, the height of the medicine in the medicine storage box needs to be maintained stable at a target height. At this time, the medicine needs to be continuously pumped into the medicine storage box through the medicine feeding device.

[0091] Specifically, such as Figure 3 As shown, before the dosing process begins, the initial motor speed Sp2 of the mechanical diaphragm pump can be determined by the preset reagent flow rate of each flotation cell. It can be understood that the sum of the preset reagent flow rates of all flotation cells is the reagent flow rate that the mechanical diaphragm pump needs to pump into the medicine storage box. After the reagent height in the medicine storage box reaches the target height, the preset reagent flow rate of each flotation cell is determined, and the initial opening Sp1 of each second electric needle valve is determined in combination with the flow interaction model as feedforward control. At this time, the reagent enters multiple flotation cells under the action of gravity.

[0092] Specifically, such as Figure 3 As shown, during the dosing process, the actual reagent flow rate Pv1 of each flotation cell can be measured by the second scalloped flowmeter, the actual reagent flow rate Pv1 of each flotation cell is fed back, the actual reagent flow rate Pv1 of each flotation cell is compared with the preset reagent flow rate of each flotation cell, the opening of the second electric needle valve is re-determined, and the actual reagent flow rate of each flotation cell is measured by the second scalloped flowmeter. By looping this process, the reagent flow rate obtained in each flotation cell can always be kept stable, so that the reagent added to the flotation cell can be fully mixed with the slurry, and the mineralization effect is good.

[0093] It is worth noting that the drug discharging controller provided in the embodiment of the present invention utilizes the predictive ability of feedforward control and the regulating ability of feedback control, especially when the flow demand changes dynamically, to achieve coordinated control of the drug flow, avoid interference and conflict, and ensure the actual flow of the drug in each flotation cell.

[0094] Specifically, such as Figure 3 As shown, during the dosing process, the actual reagent flow rate Pv1 of each flotation cell needs to be fed back to the mechanical diaphragm pump as a compensation controller, and the motor speed of the mechanical diaphragm pump is further adjusted according to the actual reagent flow rate Pv1 of each flotation cell, the actual height Pv2 of the medicine storage box, and the target height of the reagent in the medicine storage box, and the reagent flow rate pumped into the medicine storage box is adjusted, and then the reagent height in the medicine storage box is adjusted. The actual height of the medicine storage box is then fed back to the mechanical diaphragm pump, and the motor speed of the mechanical diaphragm pump is re-determined. The process is repeated to ensure that the reagent height in the medicine storage box is always stable at the target height.

[0095] It is worth noting that, through the drug outlet controller and the drug inlet controller, the actual drug flow entering each flotation cell is always kept to meet the preset drug flow of the corresponding flotation cell, and the drug dosing accuracy is improved by stabilizing the drug height in the drug storage box at the target height.

[0096] It is worth noting that the target height can be determined based on the maximum dosing flow rate of the dosing mechanism. Specifically, when all second electric needle valves are opened to their maximum degree, the cross-sectional area through which the dosing agent flows is maximized. Once the maximum dosing flow rate of the dosing mechanism is known, the flow rate of the dosing agent can be calculated. This speed is proportional to the height of the dosing agent in the dosing tank. That is, the higher the height of the dosing agent in the dosing tank, the greater the speed. Therefore, the height of the dosing agent that meets the maximum dosing flow rate can be determined and set as the target height in advance.

[0097] Preferably, the traffic interaction model is determined by the following steps:

[0098] Adjust the opening of each second electric needle valve from fully closed to fully open, so that the opening of the second electric needle valve traverses all opening combinations, and obtain the reagent flow data of the flotation cell corresponding to each second electric needle valve under each combination;

[0099] The relationship between the reagent flow rates of all flotation cells and the openings of all second electric needle valves is obtained by fitting the reagent flow rate data as a flow interaction model.

[0100] Specifically, the opening of each second electric needle valve is determined, from fully closed to fully open. For example, the opening of fully closed is 0, and the opening of fully open is 9. Then, from fully closed to fully open, each second electric needle valve includes 10 openings. If there are 3 flotation cells for simultaneous dosing, then for the 3 second electric needle valves, there are 1,000 opening combinations. If there are more flotation cells for simultaneous dosing, there will be more opening combinations.

[0101] It is worth noting that several opening combinations can be selected from all possible opening combinations for experimental analysis to obtain data on the opening of the second electric needle valve and the reagent flow rate of each flotation cell under these opening combinations. Fitting the reagent flow rate data can yield a corresponding relationship between the opening of all second electric needle valves and the reagent flow rate of all flotation cells, which serves as a flow interaction model.

[0102] Specifically, in the flow interaction model, each opening combination has a corresponding preset reagent flow rate for each flotation cell. After fitting, the preset reagent flow rates of all flotation cells may also have corresponding openings of the second electric needle valve.

[0103] Preferably, the drug adding controller and the drug dispensing controller both adopt the S7-200SMART model.

[0104] Specifically, the S7-200SMART controller is a small programmable logic controller launched by Siemens. The control algorithm adopts PID control and can be applied to the drug discharging controller and drug inlet controller provided in the embodiment of the present invention.

[0105] Compared with the prior art, the embodiment of the present invention provides an automated multi-point dosing mechanism, which connects the drug feeding device and the drug feeding port of the drug storage box to pump the drug into the drug storage box for storage, connects the drug discharging device and the drug discharging port of the drug storage box and adds the drug to multiple flotation cells, and combines the control of the drug discharging controller on the drug discharging device to ensure that the drug flow rate entering the multiple flotation cells meets the preset flow rate requirements of each flotation cell, thereby improving the accuracy of flow control, and at the same time, the control of the drug feeding controller on the drug feeding device ensures that the drug height in the drug storage box is maintained stable, so that the drug added to the flotation cell can be mixed with the mineral The slurry is fully mixed and the mineralization effect is good; at the same time, impurities included in the reagent are filtered through the first filter and the second filter, thereby improving the purity of the reagent, so that the reagent flow added to multiple flotation cells can better meet the demand, and the flotation effect is improved; and through the feedforward control of determining the initial opening of the second electric needle valve at the beginning of the dosing process, combined with the feedback control of adjusting the second electric needle valve according to the actual reagent flow and the preset reagent flow of the flotation cell during the dosing process, the reagent flow added to each flotation cell can meet the preset flow requirement of each flotation cell as much as possible, thereby further improving the dosing accuracy.

[0106] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. An automated multi-point dosing mechanism, characterized in that: The automated multi-point dosing mechanism includes a medicine storage box, a medicine feeding device, a medicine discharging device, a medicine feeding controller, and a medicine discharging controller; two ports are opened at the bottom of the medicine storage box, serving as a medicine feeding port and a medicine discharging port respectively; The medicine feeding device is connected to the medicine feeding port, and the medicine feeding controller controls the medicine feeding device to allow the medicine to enter the medicine storage box through the medicine feeding port, while at the same time making the height of the medicine in the medicine storage box stable during the medicine feeding process; One end of the drug discharging device is connected to the drug discharging port, and the other end is connected to multiple flotation cells. The drug discharging controller controls the drug discharging device so that the drug passing through the drug discharging port flows to multiple flotation cells respectively. At the same time, during the drug dosing process, the drug flow rate obtained by each flotation cell meets the preset drug flow rate of the flotation cell. The drug feeding device includes a drug feeding pipeline, and a first valve switch, a one-way valve and a mechanical diaphragm pump sequentially arranged in the drug feeding pipeline; One end of the drug feeding pipe is connected to the drug feeding port, and the other end serves as the drug feeding end; The medicine flows to the input end of the one-way valve under the control of the first valve switch, and the one-way valve is used to control the flow direction of the medicine; The medicine flows through the output end of the one-way valve to the input end of the mechanical diaphragm pump; A mechanical diaphragm pump is used to pump the medicine into the medicine storage tank through the medicine inlet port; The medicine discharging device includes a main road, a plurality of third valve switches sequentially arranged on the main road, and a second medicine discharging branch road having the same number as the third valve switches; The main channel is connected to the medicine outlet port; The input end of each second medicine outlet branch is connected to the position on the main road corresponding to the output end of the third valve switch; Each third medicine outlet branch is provided with a second scalloped flowmeter and a second electric needle valve in sequence. The second scalloped flowmeter is used to measure the flow of medicine entering the corresponding third medicine outlet branch, and the second electric needle valve controls the flow of medicine entering the flotation tank. The medicine dispensing controller is used to perform the following steps: When the dosing process begins, the initial opening of the second electric needle valve is determined according to the preset reagent flow rate of each flotation cell and the corresponding flow interaction model, and the initial actual reagent flow rate of each flotation cell is measured and obtained; During the dosing process, the actual reagent flow rate of each flotation cell is measured by the second scalloped flowmeter, and the opening of the second electric needle valve is adjusted according to the comparison result between the actual reagent flow rate and the preset reagent flow rate until the actual reagent flow rate and the preset reagent flow rate meet the flow error threshold; The dosing controller is used to perform the following steps: Before the dosing process begins, the initial motor speed of the mechanical diaphragm pump is determined according to the preset reagent flow rate of each flotation tank so that the height of the reagent in the storage tank reaches the target height; During the dosing process, the motor speed of the mechanical diaphragm pump is adjusted according to the actual reagent flow rate, target height and actual height of the medicine storage box of each flotation cell, so that the actual height of the medicine storage box is stabilized at the target height.

2. The automated multi-point dosing mechanism according to claim 1, characterized in that: The drug inlet pipeline is also provided with a back pressure valve and a first filter; The input end of the back pressure valve is connected to the drug inlet port and the output end of the mechanical diaphragm pump at the same time, and the output end of the back pressure valve is connected to the output end of the one-way valve and the input end of the mechanical diaphragm pump; The first filter is disposed between the first valve switch and the one-way valve.

3. The automated multi-point dosing mechanism according to claim 1, characterized in that: The drug discharging device comprises a plurality of first drug discharging branches, the input end of each first drug discharging branch is connected to the drug discharging port, and the output end of each first drug discharging branch is connected to the corresponding flotation tank; Each first medicine outlet branch is provided with a second valve switch, a first scalloped flow meter and a first electric needle valve in sequence; The first scalloped flowmeter is used to measure the flow of the reagent entering the first reagent outlet branch, and the first electric needle valve controls the flow of the reagent entering the flotation tank.

4. The automated multi-point dosing mechanism according to claim 1, characterized in that: A second filter is also provided on the main road; The second filter is arranged between the medicine outlet port and the first third valve switch.

5. The automated multi-point dosing mechanism according to claim 1, characterized in that: Determine the traffic interaction model through the following steps: Adjust the opening of each second electric needle valve from fully closed to fully open, so that the opening of the second electric needle valve traverses all opening combinations, and obtain the reagent flow data of the flotation cell corresponding to each second electric needle valve under each combination; The relationship between the reagent flow rates of all flotation cells and the openings of all second electric needle valves is obtained by fitting the reagent flow rate data as a flow interaction model.

6. The automated multi-point dosing mechanism according to claim 1, characterized in that: The dosing controller and the dispensing controller both adopt the S7-200SMART model.

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