High-precision conveying device suitable for ultrahigh-pressure double-degree-of-freedom series cooperation

Abstract

The invention discloses a high-precision conveying device suitable for ultrahigh-pressure double-degree-of-freedom series cooperation, and belongs to the technical field of machinery. The device is suitable for realizing reciprocating motion of a plunger rod through a way that a driving part is adopted to be matched with a high-precision ball screw, a ball screw pair is rotated by adopting a way that a screw rotates and a nut reciprocates, and the plunger rod is driven to reciprocate through the reciprocating motion of the nut. The device mainly comprises the driving part, a transmission shaftsystem, a constant-temperature shell, a buffering part and the like. The driving part comprises a motor and an encoder, and is used for providing power for motion of a plunger and realizing accuratecontrol of position; the transmission part is used for converting the driving motion of the motor into reciprocating motion of the plunger, the constant-temperature shell realizes the control over thetemperature of the device, so that the influence of heat on the precision is reduced; and a buffering assembly is used for relieving the impact problem caused by frequent acceleration alternating introducing of the transmission part in a 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

Images