Application of integrated stepping servo motor in automatic dilution instrument

 

Dilution is a key step in many chemical and biological experiments. In order to improve the accuracy and efficiency of dilution, automatic diluters are widely used. With the advancement of technology, integrated stepper servo motors are increasingly used in automatic diluters, greatly improving the performance and efficiency of the instrument.

This article will introduce in detail the application of integrated stepper servo motor in automatic diluter.

 

01.Equipment Introduction

The automatic diluter is one of the important analytical instruments frequently used in clinical tests. It measures various biochemical indicators by analyzing blood or other body fluids: such as transaminase, hemoglobin, albumin, total protein, cholesterol, myoglobin, glucose, inorganic phosphorus, amylase, calcium, etc. The comprehensive automatic dilution by this device can greatly reduce the dilution time of the experimenter.

The so-called fully automatic diluter is an instrument that automates the steps of the dilution process, including sampling, adding reagents, mixing, heat preservation reaction, sample dissolution, collection, fluid replenishment, UV or HPLC injection, detection readings, data analysis, and dissolution curve drawing. It can completely imitate and replace manual operations.

Therefore, it can be considered that the diluters currently on the market that require manual replacement of colorimetric cups (or colorimetric disks) are not truly "fully automatic" diluters.

The fully automatic diluter is sensitive, accurate and fast, which not only improves work efficiency but also reduces subjective errors and improves inspection quality.

Generally, the workflow of a fully automatic diluter is mainly divided into: machine initialization → heating and constant temperature of the diffusion pool → sampling → sample injection → fluid replenishment → cleaning → experiment completion, etc.

1.Machine initialization

The machine starts the initialization program and enters the ready state, ready to start executing commands.

2.Diffusion pool heating and constant temperature → sampling → sample injection → fluid replenishment (dilution starts)

The diffusion cell begins to heat to a constant temperature of 33°C, and the analyzer probe begins to take samples and inject them into the sample cup to dilute the liquid in the sample.

3.Cleaning → Experiment completed (dilution completed)

The probe absorbs and spits liquid back and forth in the diffusion pool to achieve the purpose of cleaning the probe. After the experiment is completed, the machine enters the initial position and waits for the next instruction.

02.Solution

Schematic diagram of electrical structure of traditional solution

Traditional electronic control systems generally use control solutions such as PC+MCU+touch screen+driver+stepper motor. This not only has cumbersome wiring and occupies a large space, but the entire control process is also very complicated, which greatly increases the development cycle.

Schematic diagram of the electrical structure of the Limaisheng upgrade solution

The control mechanism adopts an integrated controller, which integrates PLC functions and motion control functions in the same hardware device, and can realize more functions, such as a temperature rise device for controlling the temperature of the measuring cup, a photoelectric switch, etc.

The actuator uses an integrated motor, which is a highly integrated, high-precision, and high-efficiency drive device. Compared with the traditional split servo system, the integrated stepper servo motor occupies a small space, has high precision, high response, bus control, simple wiring, rich alarm functions, and lower cost.

[Advantages of integrated stepper servo motor]

High integration improves the portability of equipment: The integrated stepper servo motor integrates functional modules such as stepper motor, servo driver, encoder and controller, which greatly reduces the size and weight of the equipment. At the same time, it simplifies system wiring and reduces potential failure points.

Flexibility to meet diverse needs: The integrated stepper servo motor supports CANopen/Modbus communication and can be flexibly controlled and adjusted as needed to adapt to different work requirements.

High-precision positioning improves measurement accuracy: The integrated stepper servo motor has high positioning accuracy and can achieve high-precision positioning of mobile equipment.

Multiple control modes: support PP, VM, PV, PT, HM, IP, CSP, CSV, CST ; standard mode; support NiMotion position mode, NiMotion speed mode, NiMotion torque mode.

High-speed response improves equipment efficiency: The integrated step servo motor has a fast response speed and can quickly adjust the angle and position of the equipment. This means that the robot can obtain environmental information more quickly, improving the working efficiency and responsiveness of the equipment.

Complete alarm function: The integrated step servo motor can detect hardware failures in time to avoid affecting system operation. It is equipped with multiple safety protection functions. The LED flashing alarm can intuitively display the current status of the motor. It also has protection functions such as overvoltage/undervoltage, overheating, overcurrent, and stall alarm.