A high-precision conveying device suitable for ultra-high pressure dual-degree-of-freedom series coordination

Abstract

The invention discloses a high-precision conveying device suitable for ultra-high pressure dual-degree-of-freedom series coordination, belonging to the field of mechanical technology. The invention is used to realize the reciprocating motion of the plunger rod, which is realized by using the driving part to cooperate with the high-precision ball screw. The ball screw pair uses the screw to rotate and the nut to reciprocate, and the reciprocating motion of the nut drives the reciprocating motion of the plunger rod. . It mainly includes: driving parts, transmission shaft system, constant temperature housing and buffer parts, etc. The driving part includes a motor and an encoder, which are used to provide the power of the plunger movement and realize accurate control of the position; the transmission part is to convert the transmission motion of the motor into the reciprocating motion of the plunger; the thermostatic shell realizes the control of the temperature of the device, Thereby reducing the impact of heat on the accuracy; the buffer assembly is used to alleviate the impact problem caused by the frequent alternating acceleration of the transmission parts during the reciprocating process.

Description

technical field [0001] The invention relates to a high-precision conveying device suitable for ultra-high pressure dual-degree-of-freedom series coordination, and belongs to the field of mechanical technology. Background technique [0002] Liquid chromatography analysis technology is a widely used quantitative or qualitative analysis technology for substances. Ultra-high performance liquid chromatography (UHPLC) has rapidly developed on the basis of classic liquid chromatography and has become a new method in the field of liquid chromatography. It is composed of high-precision conveying device, sample injector, chromatographic column, detector and recorder, and has the characteristics of high pressure, high sensitivity and high efficiency. At present, my country is mainly based on high-performance liquid chromatography technology, and lacks UHPLC technology with independent intellectual property rights. The main reason lies in the core key component of UHPLC-high-precision d...

AI Technical Summary

Problems solved by technology

Due to the complexity of the transmission link, the transmission accuracy cannot meet the requirements of high precision and low pulsation in ultra-high-efficiency applications

In view of the above shortcomings, traditional HPLC pumps are often used in occasions where the accuracy level is low, and the transmission accuracy is usually about 1%, so the requirements for temperature control are not strict, and the accuracy of the high-precision delivery device must be better than 0.06% (RSD) , and it is calculated that for every 5°C increase, the accuracy error will increase by 0.01% (RSD), so strict temperature control is required, and a matching design of stiffness and accuracy is required

The traditional HPLC pump mostly adopts the plane contact method, which leads to large axial deformation of the plunger and thus loss of transmission accuracy

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