Abrégé

A screening machine for superfine powder. The screening machine includes a casing, a screen drum, a funnel, a negative pressure chamber, a rotary air spray pipe, a drive motor, a blast pipe, and a feed pipe. The screen drum is disposed in the middle part of the inner cavity of the casing. The funnel is disposed beneath the casing. The opening of the screen drum is arranged on the bottom of the screen drum and communicates with the upper opening of the funnel. The inner cavity of the casing communicates with the external induced draft fan via the negative pressure chamber disposed on the upper part of the casing. The rotary air spray pipe is arranged in the space between the screen drum and the casing. The middle part of the transverse pipe is connected via a transmission with the drive motor.

Classes IPC  ?

• B04B 5/10 - Centrifugeurs combinés avec d'autres appareils, p.ex. avec des séparateurs électrostatiques; Ensembles ou systèmes de plusieurs centrifugeurs
• B07B 1/00 - Criblage, tamisage ou triage des matériaux solides au moyen de treillis, grilles ou systèmes analogues
• B07B 1/18 - Tamis à tambours
• B07B 1/55 - Nettoyage par des jets de fluides
• B07B 7/06 - Séparation sélective des matériaux solides portés par des courants de gaz, ou dispersés dans ceux-ci par chocs contre des cribles

Abrégé

An ultrafine powder sieving machine with bi-directional airflow. A sieving cylinder (2) having a downward opening is disposed at a middle portion of an inner cavity of a machine case (1). A cylinder port of the sieving cylinder (2) is joined to an upper opening of a funnel (3). An upper negative pressure chamber (4) is in communication with an external draft inducing fan (5). A U-shaped rotary gas spraying pipe formed by a horizontal pipe (6) and a vertical pipe (7) is disposed between the sieving cylinder (2) and the machine case (1). An air input port of a blowing pipe (9) is in communication with a blowing port of an external blower (11). A feeding pipe (12) is disposed in the sieving cylinder (2). A buffering umbrella (13) is disposed above a discharging port of the feeding pipe (12). The phenomena of blocked sieving holes incurred by blocks of accumulated light and small micron-scale materials on the sieving screen are prevented, so that large-scale industrial production can be applied to sieving of ultrafine powders greater than 500 mesh.

Classes IPC  ?

• B07B 1/55 - Nettoyage par des jets de fluides
• B07B 1/18 - Tamis à tambours

Abrégé

A system formed by linking a wood powder machine and a powder sieve comprises a wood powder machine (1), a fine powder screening machine (2) and a material aggregation device that are communicated sequentially. The material aggregation device comprises a cyclone material aggregator (3) and a powder mixer (4). The cyclone material aggregator has a feeding port being in communication with a fine powder discharging port of the fine powder screening machine through a feeding pipe (5), and has a bottom discharging port being in communication with the powder mixer. A top opening of the cyclone material aggregator is in communication with an air input port of a pulse dust collector (7) through a hose (6). An air output port of the pulse dust collector is in communication with a draft inducing fan (8). An ash bucket outlet of the pulse dust collector is in communication with the powder mixer (4). The bottom of the powder mixer is provided with a discharging port. Roots, stems, leaves, and flowers of herbal medicines can all be pulverized in one step, saving the need of coarse crushing. The wood powder machine and the fine powder screening machine are connected, thereby increasing the screening efficiency, and effectively controlling the maximum diameter of final products. The whole system is in a negative-pressure environment, so as to have a blow-drying effect on materials, and save the need of an additional drying device, thereby conserving energy.

Classes IPC  ?

• B02C 23/18 - Addition de fluide, dans un but autre que celui de broyer ou de désagréger par l'énergie du fluide
• B07B 9/00 - Combinaisons d'appareils à cribler ou tamiser ou à séparer des solides par utilisation de courants de gaz; Disposition générale des installations, p.ex. schéma opératoire

Abrégé

A system formed by linking a rod mill and a powder sieve comprises a blower (1), a rod mill (3), a fine powder screening machine (2) and a material aggregation device that are communicated sequentially. The material aggregation device comprises a cyclone material aggregator (8) and a dual-helix vertical powder mixer (4). The cyclone material aggregator (8) has a feeding port being in communication with a fine material discharging port of the fine powder screening machine (2) through a feeding pipe (5), has a bottom discharging port being in communication with the dual-helix vertical powder mixer (4) through a wind-closing feeder (21.2), and has a top opening being in communication with an air input port of a pulse dust collector (7) through a hose (6). The pulse dust collector (7) has an air output port being in communication with a draft inducing fan (9), and has an ash output port being in communication with the dual-helix vertical powder mixer (4) through the wind-closing feeder (21.3). A bottom discharging port of the fine powder screening machine (2), a feeding port of the rod mill (3), and a blowing port of the blower (1) are in communication. A discharging port of the rod mill (3) is in communication with a sieving chamber of the fine powder screening machine (2). The system can realize continuous large-scale production of ultrafine powders of Chinese herbal medicines at room temperature without using any additional drying device.

Classes IPC  ?

• B02C 23/18 - Addition de fluide, dans un but autre que celui de broyer ou de désagréger par l'énergie du fluide
• B07B 7/06 - Séparation sélective des matériaux solides portés par des courants de gaz, ou dispersés dans ceux-ci par chocs contre des cribles