Automatic multi-point dosing mechanism

Abstract

The invention relates to an automatic multi-point dosing mechanism, belongs to the technical field of coal separation and processing, and solves the problem of poor coal slime flotation dosing flow control precision of an existing dosing mechanism. According to the automatic multi-point dosing mechanism, two ports are formed in the bottom of a medicine storage box and serve as a medicine inlet port and a medicine outlet port respectively; the medicine feeding device is connected with the medicine feeding port, the medicine feeding controller controls the medicine feeding device to enable the medicine to enter the medicine storage box through the medicine feeding port, and meanwhile the medicine in the medicine storage box is highly stable in the medicine feeding process; one end of the medicine outlet device is connected with the medicine outlet port, the other end of the medicine outlet device is connected with the flotation cells, the medicine outlet controller controls the medicine outlet device to enable the medicine passing through the medicine outlet port to flow to the flotation cells respectively, and meanwhile the medicine flow obtained by each flotation cell meets the preset medicine flow of the flotation cell in the medicine adding process. Accurate control over the dosing flow of a plurality of flotation cells in the dosing process is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of coal sorting and processing, and in particular to an automatic multi-point dosing mechanism. Background Art

[0002] Coal slime flotation is an important part of coal preparation production. The method and accuracy of flotation dosing are important factors affecting the flotation effect.

[0003] Coal slime flotation requires dosing at a micro flow rate. Currently, the micro flow pumps commonly used at home and abroad are mainly metering pumps. Metering pumps are expensive and produce pulse flow. The viscosity of the medium will prevent the return valve ball from resetting in time, resulting in different degrees of backflow, resulting in low control accuracy of micro flow. In addition, the feeding pressure of the current dosing control device is unstable, resulting in the inability of the reagent to fully mix with the slurry in the flotation tank. The added reagent is easily carried out with the overflowing foam, resulting in poor slurry mineralization effect and low impurity removal efficiency. The control effect of the coal preparation plant that has realized flotation automation control is not ideal.

[0004] Therefore, there is an urgent need for a technical solution that can accurately add chemicals during the coal slime flotation process. Summary of the invention

[0005] In view of the above analysis, the embodiment of the present invention aims to provide an automated multi-point dosing mechanism to solve the problem of poor control accuracy of coal slime flotation dosing flow rate in the existing dosing mechanism.

[0006] The embodiment of the present invention provides an automated multi-point dosing mechanism, which 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, which are used as a medicine feeding port and a medicine discharging port respectively;

[0007] 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, and at the same time, the height of the medicine in the medicine storage box is kept stable during the medicine feeding process;

[0008] One end of the drug discharging device is connected to the drug discharging port, and the other end is connected to multiple flotation tanks. The drug discharging controller controls the drug discharging device so that the drug passing through the drug discharging port flows to multiple flotation tanks respectively. At the same time, during the drug adding process, the drug flow rate obtained by each flotation tank meets the preset drug flow rate of the flotation tank.

[0009] Based on the further improvement of the above-mentioned automated multi-point dosing mechanism, the drug feeding device includes a drug feeding pipeline, and a first valve switch, a one-way valve and a mechanical diaphragm pump which are sequentially arranged in the drug feeding pipeline;

[0010] One end of the drug feeding pipeline is connected to the drug feeding port, and the other end serves as a drug feeding end;

[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 automatic multi-point dosing mechanism, a back pressure valve and a first filter are also 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 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;

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

[0019] The first spherical tooth flowmeter is used to measure the flow rate of the reagent entering the first reagent outlet branch, and the first electric needle valve controls the flow rate 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 road having 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 a position on the main road corresponding to the output end of the third valve switch;

[0023] A second spherical tooth flowmeter and a second electric needle valve are sequentially arranged on each third medicine outlet branch. The second spherical tooth 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 automatic multi-point dosing mechanism, a second filter is also 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 above-mentioned automated multi-point dosing mechanism, the drug dispensing controller is used 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 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;

[0028] During the dosing process, the actual reagent flow rate of each flotation cell is measured by the second spherical tooth flowmeter, and the opening of the second electric needle valve is adjusted according to the comparison result of 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.

[0029] Based on the further improvement of the above-mentioned automated multi-point dosing mechanism, the dosing controller is used to perform the following steps:

[0030] 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;

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

[0032] Based on the further improvement of the above-mentioned automated multi-point dosing mechanism, the flow interaction model is determined through the following steps:

[0033] 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 tank corresponding to each second electric needle valve under each combination;

[0034] The reagent flow rate data is fitted to obtain the relationship between the reagent flow rates of all flotation cells and the openings of all second electric needle valves as a flow interaction model.

[0035] Based on the further improvement of the above-mentioned automated multi-point dosing mechanism, the dosing controller and the drug dispensing controller both adopt the S7-200SMART model.

[0036] Compared with the prior art, the present invention can achieve at least 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 the medicine is added to multiple flotation cells. The control of the medicine discharging device by the medicine discharging controller makes the flow rate of the medicine entering the multiple flotation cells meet 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 adding controller on the medicine feeding device makes the height of the medicine in the medicine storage box remain 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. The impurities in the reagent are filtered through the first filter and the second filter, thereby improving the purity of the reagent, making the reagent flow 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 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 also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The 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 components throughout the drawings.

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

[0043] Figure 2 The second structural schematic 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 are 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, but 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, which are used 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, and at the same time, the height of the medicine in the medicine storage box is kept 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 tanks. The drug discharging controller controls the drug discharging device so that the drug passing through the drug discharging port flows to multiple flotation tanks respectively. At the same time, during the drug adding process, the drug flow rate obtained by each flotation tank meets the preset drug flow rate of the flotation tank.

[0049] Specifically, 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, and the drug discharging controller controls the drug discharging device so that the drug flow rate of the drug 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, Figure 1 As shown, the preset flow rate reagents in each flotation cell can be reasonably set according to actual conditions, and can be the same or different, so that the automatic multi-point dosing mechanism provided by the present invention has a wide range of applications.

[0051] Specifically, 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, 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 which are sequentially arranged in the drug feeding pipeline;

[0053] One end of the drug feeding pipeline is connected to the drug feeding port, and the other end serves as a 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 also 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, 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 a role in 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 pipeline can be adjusted, and then 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 blocked, the pressure of the medicine inlet pipeline below will be too high. In order to avoid damaging the medicine inlet pipeline, a back pressure valve can be set to effectively reduce the pressure of the medicine inlet pipeline 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 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;

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

[0067] The first spherical tooth flowmeter is used to measure the flow rate of the reagent entering the first reagent outlet branch, and the first electric needle valve controls the flow rate of the reagent entering the flotation tank.

[0068] Specifically, the input end of each first drug outlet branch is connected to the drug outlet port, so that the drug flow rate out of the drug outlet port can flow evenly to different flotation cells, and multiple flotation cells with the same preset drug flow rate can be quickly and conveniently added with drugs, so that the drugs are fully mixed with the slurry in the flotation cell.

[0069] Specifically, the second valve switch, the first spherical tooth flowmeter and the first electric needle valve sequentially arranged on the first medicine outlet branch can effectively control, measure the flow rate and adjust the medicine flow rate of the medicine entering the first medicine outlet branch.

[0070] In another embodiment, 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;

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

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

[0073] A second spherical tooth flowmeter and a second electric needle valve are sequentially arranged on each third medicine outlet branch. The second spherical tooth 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.

[0074] Preferably, a second filter is also provided on the main road;

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

[0076] Specifically, Figure 2 As shown, a plurality of third valve switches and second medicine outlet branches having the same number as the third valve switches are sequentially arranged on the main road of the medicine outlet device; the medicine outlet port is connected to the main road to direct the medicine in the medicine storage box to the main road, and the main road distributes the medicine to different second medicine outlet branches through the third valve switches, and on each second medicine outlet branch, the medicine passes through the second spherical tooth flowmeter and the second electric needle valve in sequence and enters the flotation tank.

[0077] Specifically, Figure 2 As shown, a second filter is also provided on the main road, and the second filter is used for post-impurity removal. The mesh number of the filter is higher than that of the first filter, and it can effectively prevent the medicine flowing out of the medicine outlet port from clogging the second electric needle valve and the second round tooth flow meter.

[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, so as to improve the coordination of different electric needle valves and increase the stability of the drug flow regulation.

[0080] Specifically, a first filter and a second filter are respectively arranged 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 used to perform the following steps:

[0082] When the dosing process starts, 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 spherical tooth flowmeter, and the opening of the second electric needle valve is adjusted according to the comparison result of 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.

[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 of each flotation cell, the target height and the actual height of the medicine storage box, so that the actual height of the medicine storage box is stabilized at the target height.

[0087] Specifically, a liquid level meter 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 may also be provided at the medicine outlet port, and the actual height of the medicine in the medicine storage box may also be determined by the pressure gauge.

[0089] Specifically, Figure 2As shown, before the dosing process begins, the reagent is pumped into the medicine storage box through the medicine feeding device so that the height of the reagent in the medicine storage box reaches the target height; when the dosing process begins, the reagent 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, and at this time, the medicine needs to be continuously pumped into the medicine storage box through a medicine feeding device.

[0091] Specifically, 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, Figure 3 As shown, during the dosing process, the actual reagent flow rate Pv1 of each flotation cell can be measured by the second spherical tooth 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 spherical tooth flowmeter. By cycling 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, it realizes the coordinated control of the drug flow, avoids interference and conflict, and ensures the actual flow of the drug in each flotation cell.

[0094] Specifically, 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, thereby adjusting the height of the reagent in the medicine storage box, and then feeding back the actual height of the medicine storage box to the mechanical diaphragm pump, re-determining the motor speed of the mechanical diaphragm pump, and repeating the process to ensure that the height of the reagent 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. By stabilizing the drug height in the drug storage box at the target height, the drug addition accuracy is improved.

[0096] It is worth noting that the target height can be determined based on the maximum dosing agent flow rate of the dosing mechanism. Specifically, when the opening of all the second electric needle valves is opened to the maximum, the cross-sectional area through which the agent flows is maximized. When the maximum dosing agent flow rate of the dosing mechanism is known, the speed of the agent flow can be calculated. The speed is proportional to the height of the agent in the medicine storage box, that is, the higher the height of the agent in the medicine storage box, the greater the speed. Therefore, the height of the agent that meets the maximum dosing agent flow rate can be determined, and this height is used as the target height and set 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 tank corresponding to each second electric needle valve under each combination;

[0099] The reagent flow rate data is fitted to obtain the relationship between the reagent flow rates of all flotation cells and the openings of all second electric needle valves 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 more flotation cells are used for simultaneous dosing, more opening combinations will be included.

[0101] It is worth noting that several opening combinations can be selected from all opening combinations for experiments to obtain the opening of the second electric needle valve and the reagent flow data of each flotation cell under the several opening combinations. The corresponding relationship between the opening of all second electric needle valves and the reagent flow of all flotation cells can be obtained by fitting the reagent flow data as a flow interaction model.

[0102] Specifically, in the flow interaction model, under each opening combination, there is a corresponding preset reagent flow rate of 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 model 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 inlet device with the drug inlet port of the drug storage box to pump the drug into the drug storage box for storage, connects the drug outlet device with the drug outlet port of the drug storage box and adds the drug into multiple flotation cells, and controls the drug outlet device with the drug outlet controller so 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 dosing controller on the drug inlet device maintains the drug height in the drug storage box 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, the impurities included in the reagent are filtered through the first filter and the second filter, so the purity of the reagent is improved, 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 of the flotation cell and the preset reagent flow 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, and the dosing accuracy is further improved.

[0106] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope 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, and at the same time, the height of the medicine in the medicine storage box is kept 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 tanks. The drug discharging controller controls the drug discharging device so that the drug passing through the drug discharging port flows to multiple flotation tanks respectively. At the same time, during the drug adding process, the drug flow rate obtained by each flotation tank meets the preset drug flow rate of the flotation tank.

2. The automated multi-point dosing mechanism according to claim 1, characterized in that: The drug feeding device comprises a drug feeding pipeline, and a first valve switch, a one-way valve and a mechanical diaphragm pump which are sequentially arranged in the drug feeding pipeline; One end of the drug feeding pipeline is connected to the drug feeding port, and the other end is used 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.

3. The automated multi-point dosing mechanism according to claim 2, 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.

4. 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 spherical tooth flow meter and a first electric needle valve in sequence; The first spherical tooth flowmeter is used to measure the flow rate of the reagent entering the first reagent outlet branch, and the first electric needle valve controls the flow rate of the reagent entering the flotation tank.

5. The automated multi-point dosing mechanism according to claim 2, characterized in that: The medicine discharging device comprises a main road, a plurality of third valve switches arranged in sequence 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; A second spherical tooth flowmeter and a second electric needle valve are sequentially arranged on each third medicine outlet branch. The second spherical tooth 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.

6. The automated multi-point dosing mechanism according to claim 5, 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.

7. The automated multi-point dosing mechanism according to claim 5, characterized in that: The medicine dispensing controller is used to perform the following steps: When the dosing process starts, 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 spherical tooth flowmeter, and the opening of the second electric needle valve is adjusted according to the comparison result of 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.

8. The automated multi-point dosing mechanism according to claim 7, characterized in that: 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 of each flotation cell, the target height and the actual height of the medicine storage box, so that the actual height of the medicine storage box is stabilized at the target height.

9. The automated multi-point dosing mechanism according to claim 7, 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 tank corresponding to each second electric needle valve under each combination; The reagent flow rate data is fitted to obtain the relationship between the reagent flow rates of all flotation cells and the openings of all second electric needle valves as a flow interaction model.

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

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