Dosing device

Abstract

The utility model belongs to the field of chemical equipment, and particularly relates to a dosing device. Comprising a rack, a control box arranged at the top of the rack and a pesticide storage box located at the bottom of the rack, and a plurality of pesticide adding pipelines are integrated in the rack; each dosing pipeline comprises an electromagnetic metering pump, a one-way valve, a surge tank, a pressure release valve, a flow meter and a back pressure valve which are connected through pipelines; a PLC (Programmable Logic Controller) module is arranged in the control box, is electrically connected with the flow meter, the pressure meter and the electromagnetic metering pump through cables, and is used for adjusting the working frequency of the electromagnetic metering pump according to flow and pressure feedback data so as to control the dosing precision of the liquid outlet. According to the utility model, the dosing can be accurately controlled, and the space can be saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of chemical equipment, concretely is a kind of dosing device. BACKGROUND

[0002] Online automatic control dosing device is the key equipment in the precise manufacturing process of medicine, chemical industry, electronic copper foil and the like, and its core task is to accurately and stably add chemical reagent to reaction system or product surface to ensure that product core performance index is achieved and quality consistency is achieved.

[0003] Currently, the mainstream technical scheme in this field generally adopts the basic framework of "programmable logic controller+ electromagnetic metering pump". Under this framework, PLC drives metering pump to work according to preset program, to realize basic start-stop and flow regulation functions. However, the technical bottleneck existing in this traditional mode is difficult to meet the increasingly stringent requirements of modern high-end precision manufacturing, and its main defects are reflected in the following aspects: the traditional device usually uses simple PID or other basic closed-loop algorithm to control the single flow of metering pump, cannot obtain pressure feedback and maintain pressure stability, and cannot effectively compensate the systematic interference caused by pipeline pressure fluctuation, liquid viscosity change or pump body pulsation. Its actual long-term operation precision is generally low, cannot meet the extremely high precision requirement of ±0.5% or less in the application scenarios such as medicine synthesis and high-performance copper foil, and directly affects the uniformity and reliability of product performance. In the face of complex process with multiple components and multiple addition points, the existing solution usually adopts mechanical parallel stacking of functional units (single pump, single path pipeline) to realize channel expansion. This loose structure layout leads to large overall equipment footprint, and pipeline arrangement is messy, which not only wastes valuable space in production workshop, but also contradicts the concept of compactness, modularity and neatness of modern intelligent workshop, increases the difficulty and cost of operation and maintenance. Therefore, there is an urgent need for a dosing device that can accurately control dosing and save space. UTILITY MODEL CONTENTS

[0004] To solve the above technical problems, the utility model provides an online automatic control dosing device. The rack integrates four-way dosing pipelines, and a precision closed-loop regulation system is formed by combining flow meter, pressure gauge, back pressure valve, pressure stabilizing tank and PLC module to stabilize pressure and flow, and industrial Ethernet interface is provided to connect AI system, so as to realize precision improvement, volume reduction and intelligent linkage.

[0005] To achieve the above purpose, the utility model specifically adopts the following technical means:

[0006] An online automatic control dosing device, comprising a rack, a control box arranged on the top of the rack, and a reagent storage tank arranged at the bottom of the rack, wherein the rack is integrated with a plurality of dosing pipelines;

[0007] Each route adds the pipeline including the electromagnetic metering pump connected by the pipeline, the check valve, the pressure tank, the pressure relief valve, the flow meter and the back pressure valve; after the electromagnetic metering pump outlet, the check valve, the pressure relief valve, the hand valve, the flow meter are connected in turn; at the same time, the pressure relief valve is connected with the pressure tank in parallel, and the pressure gauge and the back pressure valve are installed at the lower part;

[0008] Further, the inlet of the electromagnetic metering pump is connected to the medicine storage tank through the pre-pump hose. The outlet of the back pressure valve is connected with the overpressure backflow hose, and the end of the overpressure backflow hose is connected to the medicine storage tank. When the pipeline pressure is too high, the medicine solution flows back to the medicine storage tank through the back pressure valve.

[0009] The control box is provided with a PLC module, which is electrically connected with the flow meter, the pressure gauge and the electromagnetic metering pump through a cable, for adjusting the working frequency of the electromagnetic metering pump according to the flow and pressure feedback data, so as to control the medicine adding precision of the outlet.

[0010] Further, the control box is also provided with an industrial Ethernet physical interface for connecting with an upper AI system.

[0011] Further, the check valve, the pressure tank, the pressure relief valve and the back pressure valve are connected through the modular movable joint and the transparent PVC pipeline.

[0012] Further, the front surface of the control box is provided with a touch screen, which is in communication connection with the PLC module, for parameter setting and state display.

[0013] Further, the four medicine adding pipelines are distributed at 90° around the control box.

[0014] Further, the end of the pre-pump hose is provided with a counterweight and a filter.

[0015] Compared with the prior art, the utility model has the following beneficial technical effects:

[0016] Since the multi-stage pressure management and precision closed loop control circuit composed of the back pressure valve, the pressure tank, the pressure relief valve, the high-precision flow meter and the pressure gauge is adopted, and the working frequency of the electromagnetic metering pump is dynamically adjusted by the PLC module in real time, the device can effectively inhibit the pressure fluctuation and the pumping pulsation. According to the third party test, in the flow range of 0.5-10L / h, the actual metering deviation is ≤±0.3%, the precision is improved by more than 85% compared with the traditional device (deviation ±1.5%-2.0%), the flow fluctuation is ≤0.1% in 1000 hours of continuous operation, and the harsh process requirements of the precision fields such as the medical grade and the high-end copper foil manufacturing are met.

[0017] The device highly integrates four medicine adding systems in a compact space, 4 pipelines are arranged at an angle of 90° and modular quick couplings are designed, and the overall land area is reduced by more than 50% compared with a traditional parallel layout device (about 2 m2). The layout makes the pipeline debugging and maintenance paths independent and interference-free, the single pipeline disassembly and replacement time is less than or equal to 3 minutes, the operation efficiency of the maintenance personnel is improved by 40%, the average fault elimination time is shortened from 45 minutes to 15 minutes, and the device perfectly adapts to the needs of compactness, integration and efficient operation and maintenance of a modern intelligent workshop. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the appearance of the utility model;

[0019] Figure 2 is a schematic diagram of the internal structure of an embodiment of the utility model;

[0020] Figure 3 is a schematic diagram of the medicine adding pipeline of an embodiment of the utility model;

[0021] Figure 4 is a schematic diagram of the internal integration of an embodiment of the utility model.

[0022] The numbers in the figure are:

[0023] 1, device door plate; 2, control box; 3, medicine adding pipeline; 4, touch screen; 5, rack; 6, flow meter; 7, hand valve; 8, pressure stabilizing tank; 9, pressure relief valve; 10, movable joint; 11, transparent PVC pipeline; 12, pressure gauge; 13, back pressure valve; 14, connecting hose; 15, check valve; 16, electromagnetic metering pump; 17, overpressure return hose; 18, pre-pump hose; 19, medicine storage box. DETAILED DESCRIPTION

[0024] The embodiments of the utility model will be described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification. The utility model can also be implemented or applied through different specific embodiments, and the details in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the drawings provided in the following examples only illustrate the basic concept of the utility model in a schematic manner, and the following examples and features in the examples can be combined with each other without conflict.

[0025] The accompanying drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation on the utility model; in order to better illustrate the embodiments of the utility model, some components of the drawings will be omitted, enlarged or reduced, and the size of the actual product is not represented; for those skilled in the art, the omission of some well-known structures and their descriptions in the drawings is understandable.

[0026] Please refer to Figure 2 and Figure 4 Four-way dosing pipelines 3 are arranged at 90° angles around the control box 2 and are fixed to the square steel framework around the dosing device rack 5, and a maintenance channel with a width of not less than 200 mm is reserved around.

[0027] Please refer to Figure 2 , and electrical element integration is carried out. The dosing device touch screen 4 is connected to the PLC module in the control box 2 through an Ethernet line, and is used for man-machine interaction, state display and parameter setting. The flow meter 6 and the pressure gauge 12 are connected to the analog input module of the PLC through 4-20 mA analog signal lines, and real-time flow and pressure data are collected. The electromagnetic metering pump 16 is connected to the pulse output module of the PLC through a pulse signal line, and receives a frequency control signal (0-10 kHz corresponds to 0-rated flow). The control box 2 also integrates an industrial Ethernet module (supports Profinet / Modbus TCP protocol), which is connected to the workshop network through a physical network port, and is used to establish communication with the upper AI system, configure IP address and protocol parameters to ensure stable data upload and instruction reception.

[0028] Please refer to Figures 1-3 . First, the hardware is assembled, the dosing device rack 5 is taken, the rack 5 is leveled through the bottom adjusting foot cup, and the horizontal deviation is required to be ≤2 mm; the dosing device control box 2 is installed on the top of the rack 5, and the dosing device storage tank 19 is placed in the bottom area.

[0029] The pipeline system is assembled taking the single-way dosing pipeline 3 as an example. The dosing pipeline pump front connecting pump front hose 18 is taken, the hose end is provided with a counterweight and a filter, one end of the hose is put into the storage tank 19, and the other end is connected to the inlet of the electromagnetic metering pump 16 through the movable joint 10. After the electromagnetic metering pump 16, a one-way valve 15, a pressure relief valve 9, a hand valve 7 and a flow meter 6 are connected in sequence; at the same time, the pressure relief valve 9 is connected in parallel with the pressure stabilizing tank 8, and a pressure gauge 12 and a back pressure valve 13 are installed. The components are connected and locked through the modular movable joint 10 and the transparent PVC pipeline 11 between the components, so as to ensure that the seal is leakproof, and after completion, pressure test is required: pressure is maintained at 0.6 MPa for 30 minutes, and the pressure drop is required to be ≤0.02 MPa.

[0030] Please refer to Figure 3, the flow direction of the device is as follows: the liquid medicine is discharged from the medicine storage tank 19, is sucked into and pressurized by the electromagnetic metering pump 16 through the pre-pump hose 18, then flows through the check valve 15 to prevent backflow of the liquid medicine, then enters the medicine adding pipeline transparent PVC pipeline 11 through the connecting hose 14, flows through the hand valve 7 to facilitate manual adjustment of the flow or isolation of the pipeline, and finally is output after accurate metering by the flow meter 6 integrated at the liquid outlet. Among them, the back pressure valve 13 is a mechanical valve, which is used to maintain the constant pressure at the outlet of the system, and when the outlet pressure is too high, the excess liquid medicine can return to the medicine storage tank 19 through the overpressure backflow hose 17 connected thereto. The pressure relief valve 9 serves as a safety redundancy and opens to release pressure when the pressure is abnormally high; the pressure stabilizing tank 8 is used to buffer the pressure pulsation generated by the operation of the electromagnetic metering pump 16, so as to create stable pressure conditions for the pipeline.

[0031] The operation control logic of the device includes two modes. In the local control mode, the operator sets parameters such as target flow (e.g. 5 L / h) and pressure upper limit (e.g. 0.4 MPa) through the touch screen 4; the PLC module receives real-time feedback data (sampling period 50 ms) of the flow meter 6 and the pressure gauge 12, dynamically adjusts the working frequency (adjustment step 0.05 Hz) of the electromagnetic metering pump 16 through the PID control algorithm, so as to realize accurate and stable control of the flow; when the pressure exceeds the set threshold, the PLC triggers an audible and light alarm and prompts manual intervention to adjust the back pressure valve 13 or the pressure relief valve 9. In the AI linkage mode, the PLC uploads real-time operation data (flow, pressure, cumulative medicine adding amount) to the upper AI system every 100 ms through the industrial Ethernet interface; the AI system issues new target flow parameters based on the optimization instructions obtained by analyzing the downstream product such as copper foil gloss; the PLC can respond within 200 ms after receiving the new target flow parameters, triggers flow closed-loop adjustment, and feeds back the execution result to the AI system, so as to form a full-automatic intelligent closed-loop management and control of quality data→AI decision→medicine adjustment→quality feedback.

[0032] The maintenance and fault handling process is as follows: when a single pipeline needs to be replaced or maintained, it can be disassembled through the modular quick-mounting movable joint 10, and the single operation time can be controlled within 3 minutes; after replacing the filter element or repairing the leakage point, reconnect and test at a pressure of 0.5 MPa for 2 minutes to confirm that there is no leakage before resuming operation. When the pressure gauge 12 detects that the pipeline pressure is continuously higher than 0.5 MPa (overpressure fault), or the flow meter 6 detects that the flow is continuously 0 (flow interruption fault), the PLC module will immediately trigger an audible and light alarm, and can automatically switch to the standby pipeline or stop adding medicine according to the preset logic; the maintenance personnel can query the specific fault code (e.g. E01 represents overpressure, E02 represents flow interruption) through the touch screen 4 to quickly locate and eliminate the fault.

[0033] The embodiment of the utility model is described in detail above in combination with the drawings, but the utility model is not limited to this, and various changes can be made within the knowledge range possessed by the person skilled in the art without departing from the purpose of the utility model.

Claims

1. A dosing device, comprising a frame (5), a control box (2) disposed at the top of the frame (5), and a drug storage tank (19) located at the bottom, characterized in that, The frame (5) integrates several dosing pipes (3); Each dosing pipeline (3) includes an electromagnetic metering pump (16), a check valve (15), a pressure stabilizing tank (8), a pressure relief valve (9), a flow meter (6), and a back pressure valve (13) connected by a pipeline; after the outlet of the electromagnetic metering pump (16), the check valve (15), the pressure relief valve (9), the manual valve (7), and the flow meter (6) are connected in series in sequence; at the same time, the pressure relief valve (9) is connected in parallel to the pressure stabilizing tank (8), and a pressure gauge (12) and a back pressure valve (13) are installed at the bottom; The inlet of the electromagnetic metering pump (16) is connected to the medicine storage tank (19) through the pump inlet hose (18); the outlet of the back pressure valve (13) is connected to the overpressure return hose (17), and the end of the overpressure return hose (17) is connected to the medicine storage tank (19); when the pipeline pressure is too high, the medicine flows back to the medicine storage tank (19) through the back pressure valve (13). The control box (2) is equipped with a PLC module. The PLC module is electrically connected to the flow meter (6), pressure gauge (12) and electromagnetic metering pump (16) via a cable. It is used to adjust the working frequency of the electromagnetic metering pump (16) according to the flow and pressure feedback data, thereby controlling the dosing accuracy of the liquid outlet.

2. The dosing device according to claim 1, characterized in that, The control box (2) is also equipped with an industrial Ethernet physical interface for connecting to the host AI system.

3. The dosing device according to claim 1, characterized in that, The one-way valve (15), pressure tank (8), pressure relief valve (9) and back pressure valve (13) are connected by a modular movable joint (10) and a transparent PVC pipe (11).

4. The dosing device according to claim 1, characterized in that, The control box (2) is equipped with a touch screen (4) on the front. The touch screen (4) is connected to the PLC module for parameter setting and status display.

5. The dosing device according to claim 1, characterized in that, The four dosing pipes (3) are distributed at 90° with respect to the control box (2).

6. The dosing device according to claim 1, characterized in that, The end of the pump inlet hose (18) is provided with a counterweight and a filter.

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