CN203189251U - Control system of liquid injection metering pump - Google Patents

Abstract

The utility model discloses a control system of a liquid injection metering pump, which is used for providing digital control with high precision, high pressure and high safety for the liquid injection metering pump. The control system includes an input display unit, a pressure measurement module, and a PLC control system. unit, a servo drive system, the input display unit is connected to the PLC control unit through a signal line, and both the pressure measurement module and the servo drive system are connected to the PLC control unit. The liquid injection device implementing the utility model can accept the instructions of the intelligent touch screen through the PLC program to control the discharge and suction of the liquid, and at the same time, various preset working modes provide great convenience to the user.

Description

The Control System of Injection Metering Pump

technical field

The utility model belongs to the control field of metering equipment, in particular to a control system of a liquid injection metering pump. the

Background technique

In the experiments and production processes in various fields of the pharmaceutical, food and beverage and petrochemical industries, precise metering and precise dosing of liquid raw materials are required, and metering pumps can meet the vast majority of industrial production due to the medium, pressure and capacity they transmit. Number requirements become an ideal precision metering equipment. However, the indicators of metering pumps used in medical, petrochemical and other industries, such as uninterrupted filling capacity, filling pressure and precision requirements, are more stringent than other industrial fields, and its development lags behind. the

The existing technology generally uses an AC motor as the power source of the metering pump, and adds frequency conversion and flow stabilization technology to realize flow regulation, which cannot meet the requirements of flow continuity and accuracy. The Chinese patent with the publication number CN2016506442U discloses a precision plunger metering pump, which uses a combination of a stepping motor and a photoelectric encoder as the driving control, which improves the metering accuracy, but there is a continuous filling capacity and insufficient filling pressure, and visual management Technical issues such as integration with components. the

Utility model content

Purpose of the utility model: The purpose of this utility model is to solve the above-mentioned defects in the metering pump control system in the prior art, and provide a control system for the liquid injection metering pump with high precision, fast response and visual management. the

Technical solution: The control system of the liquid injection metering pump described in the utility model is realized in the following way: a control system of the liquid injection metering pump, including an input display unit, a pressure measurement module, a PLC control unit, and a servo drive system , the input display unit is connected to the PLC control unit through a signal line, the pressure measurement module and the servo drive system are connected to the PLC control unit, the difference is that the input display unit inputs signals to the PLC control unit and accepts PLC control The information fed back by the unit, the pressure test module inputs the signal to the PLC control unit, and the PLC control unit outputs the signal to the servo drive system for action. the

The PLC control unit includes a PLC host, a position sensor connected to its input end and a solenoid valve connected to its output end; the servo drive system includes a servo drive and a servo motor, one end of the servo drive is connected to the PLC host, and the other end is connected to the servo motor connection; the rotating shaft of the servo motor is connected to the mechanical linkage system in the metering pump; the pressure measurement module includes a pressure sensor and a PLC analog-to-digital conversion module, one end of the PLC analog-to-digital conversion module is connected to the PLC host, and the other end is connected to the pressure sensor Or connect to the pressure output port of the front-end equipment. the

The input display unit is an intelligent touch screen terminal. the

The output end of the PLC mainframe is also connected with sound-activated alarm equipment and light-activated alarm equipment. the

In the control system of the liquid injection metering pump described in the utility model, the intelligent touch screen terminal is a true color display, and two-dimensional animation can be used to realize the visualization of the internal operation state of the metering pump cavity. the

In the control system of the liquid injection metering pump described in the utility model, the pressure output end of the front-end equipment refers to the liquid supply equipment of the metering pump, and the pressure at the output end is the input pressure of the utility model, which is transmitted to the PLC analog digital The conversion module is an electrical analog signal. the

Beneficial effects: the control system of the liquid injection metering pump described in the utility model is used to provide high-precision, high-pressure, high-safety digital control for the liquid injection metering pump. The liquid injection device of the utility model can be controlled by a PLC host The internal program accepts the instructions of the smart touch screen to control the discharge and suction of the liquid. At the same time, it can pre-set a variety of working modes for the PLC host, which provides great convenience to the user. the

Description of drawings

Fig. 1 is a schematic diagram of the system connection of the utility model. the

Detailed ways

In order to deepen the understanding of the utility model, the utility model will be further described below in conjunction with the embodiments and accompanying drawings. The embodiment is only used to explain the utility model, and does not constitute a limitation to the protection scope of the utility model. the

As shown in Figure 1, the intelligent touch screen terminal receives the relevant parameters required for system operation input by the user, and sends them to the PLC host along with the command; the PLC host combines the pressure measurement module, and the pressure information measured by the pressure sensor is sent to the PLC for simulation. The analog signal of the digital conversion module, or the analog signal provided by the pressure output terminal of the front-end equipment, and the positioning signal of the position sensor, send signals to the solenoid valve and the servo driver, determine the operation mode of the servo motor, and precisely control the liquid suction of the injection metering pump , discharge volume and discharge speed; the PLC host feeds back the received pressure and position information to the smart touch screen terminal, controls the two-dimensional animation movement and draws the real-time running curve; The equipment sends out an alarm signal to inform the user to shut down and overhaul. the

The control system of the liquid injection metering pump implementing the utility model can provide various working modes such as constant speed operation, constant pressure operation and tracking operation through the PLC program, which provides great convenience for users. the

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model. the

Claims (4)

1. A control system for an injection metering pump, characterized in that it comprises an input display unit, a pressure measurement module, a PLC control unit, and a servo drive system, the input display unit is connected with the PLC control unit by a signal line, and the pressure Both the measurement module and the servo drive system are connected with the PLC control unit. the 2. The control system of the liquid injection metering pump according to claim 1, wherein the PLC control unit comprises a PLC host, a position sensor connected to its input end and a solenoid valve connected to its output end; the servo drive The system includes a servo driver and a servo motor, one end of the servo driver is connected to the PLC host, and the other end is connected to the servo motor; the rotating shaft of the servo motor is connected to the mechanical linkage system in the metering pump; the pressure measurement module includes a pressure sensor and a PLC Analog-to-digital conversion module, one end of the PLC analog-to-digital conversion module is connected to the PLC host, and the other end is connected to the pressure sensor or the pressure output end of the front-end equipment. the 3. The control system of the liquid injection metering pump according to claim 1 or 2, wherein the input display unit is an intelligent touch screen terminal. the 4. The control system of the liquid injection metering pump according to claim 2, characterized in that, the output end of the PLC host is also connected to a sound-activated alarm device and a light-activated alarm device. the

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