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Liquid nitrogen freezing crusher suitable for biomedical degradable materials

A degradable material, liquid nitrogen freezing technology, applied in grain processing, plastic recycling, recycling technology and other directions, can solve the problems of uncontrollable powder particle size, moisture condensation, long powder transmission path, etc., to achieve precise control, Guarantee the effect of use and meet the effect of use requirements

Pending Publication Date: 2022-08-09
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current cryogenic pulverization technology has the problem of uncontrollable powder particle size when preparing degradable medical polymer materials for 3D printing. At the same time, the traditional equipment has a long powder transmission path, and the powder will suffer from insufficient cold energy at the output terminal. However, moisture condensation occurs, leading to powder degradation, which poses a challenge to the preparation of water-degradable medical polymer powders.

Method used

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  • Liquid nitrogen freezing crusher suitable for biomedical degradable materials
  • Liquid nitrogen freezing crusher suitable for biomedical degradable materials
  • Liquid nitrogen freezing crusher suitable for biomedical degradable materials

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0135] 1. Check the equipment, the blade groove is matched with the first positioning threaded hole on the blade, and the bolts are installed;

[0136] 2. Turn on the power supply, set the pre-cooling temperature to -165°C, the crushing temperature to -150°C, and connect the storage bag at the end of the discharge port;

[0137] 3. Open the liquid nitrogen valve, adjust the appropriate liquid nitrogen supply speed, and wait for the temperature to drop to the set temperature;

[0138] 4. After the temperature drops to the set temperature, add 500g of bulk PLLA particles from the upper end of the feed port, and close the feed port valve;

[0139] 5. After the temperature is stable, set the fan speed to 45 and the feeding speed to 10. At this time, the block PLLA enters the crushing bin with the feeding screw;

[0140] 6. Under the action of blades and toothed discs, the massive PLLA particles are crushed into powder;

[0141] 7. The powder enters the discharge port from the cr...

example 2

[0146] 1. Check the equipment, the blade groove is matched with the first positioning threaded hole on the blade, and the bolts are installed;

[0147] 2. Turn on the power supply, set the pre-cooling temperature to -190°C, the crushing temperature to -180°C, and connect the storage bag at the end of the discharge port;

[0148] 3. Add 500g of block PLLA particles from the upper end of the feeding port, open the valve of the feeding port, when all the block PLLA particles enter the storage bin, close the valve of the feeding port;

[0149] 4. Open the liquid nitrogen valve, adjust the appropriate liquid nitrogen supply speed, and wait for the temperature to drop to the set temperature;

[0150] 5. After the temperature is stable, set the fan speed to 45 and the feeding speed to 10. At this time, the block PLLA enters the crushing bin with the rotation of the feeding screw;

[0151] 6. Under the action of blades and toothed discs, the massive PLLA particles are crushed into po...

example 3

[0157] 1. Check the equipment, the blade groove is matched with the first positioning threaded hole on the blade, and the bolts are installed;

[0158] 2. Turn on the power, set the pre-cooling temperature to -90°C, the crushing temperature to -70°C, and connect the storage bag at the end of the discharge port;

[0159] 3. Add 500g block PGA particles from the upper end of the feed port, open the feed port valve, when the block polylactic acid PGA particles all enter the storage bin, close the feed port valve;

[0160] 4. Open the liquid nitrogen valve, adjust the appropriate liquid nitrogen supply speed, and wait for the temperature to drop to the set temperature;

[0161] 5. After the temperature is stable, set the fan speed to 45 and the feeding speed to 10. At this time, the massive PGA particles enter the crushing bin with the rotation of the feeding screw;

[0162] 6. Under the action of blades and toothed discs, the massive PGA particles are crushed into powder;

[0163...

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Abstract

The invention discloses a liquid nitrogen freezing and crushing machine suitable for biomedical degradable materials. The liquid nitrogen freezing and crushing machine comprises a feeding unit; a crushing unit; an output unit; a controller; wherein a pretreatment bin of the feeding unit, a crushing bin of the crushing unit and a discharging bin of the output unit are respectively provided with a first feeding pipe, a second feeding pipe and a third feeding pipe which are communicated with liquid nitrogen supply equipment; a first temperature sensor in communication connection with the controller is arranged below the first feeding pipe; a second temperature sensor is arranged on a first connecting pipeline between the smashing bin and the discharging bin, and a flow control valve is arranged at the position, matched with the third feeding pipe, of the discharging bin. The invention provides a liquid nitrogen freezing crusher suitable for a biomedical degradable material, and solves the problem that the degradable medical high polymer material absorbs water and is degraded due to insufficient cold energy caused by long-distance pipeline output in the crushing process.

Description

technical field [0001] The present invention relates to a pulverizing device. More specifically, the present invention relates to a liquid nitrogen refrigerated pulverizer suitable for biomedical use for the pulverization of degradable medical polymer materials. Background technique [0002] Selective laser sintering (SLS) technology is an important 3D printing technology, and it is an advanced manufacturing method based on the discrete / stacking principle that has developed rapidly in recent years. SLS technology uses infrared lasers as the energy source, selectively melts the powder materials according to the three-dimensional model, and superimposes them layer by layer. The molding method has the characteristics of simple manufacturing process, high flexibility, low cost, high material utilization rate, high molding speed, etc., and can realize the printing of complex structures. SLS technology has a wide range of applications in printing regenerated tissues and organs, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C19/18B02C23/04
CPCB02C19/186B02C23/04Y02W30/62
Inventor 戚方伟帅词俊
Owner JIANGXI UNIV OF SCI & TECH
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