This obstetric examination bed is suitable for obstetrics and gynecology for
parturition;
also suit for after the birth of observation and implementation of gynecological
examination, diagnosis and operation;
The exam table is easy to operation, table up and down by electric control, back plate controlled by gas spring;
Obstetric Examination Table,Gynecology Examination Table,Obstetric Exam Table,Ce Approved Obstetric Examination Table Shandong Lewin Medical Equipment Co., Ltd. , https://www.lewinmed.com
Granulation is the process of adding a binder to fine powder, which is then uniformly mixed to form granulated particles. This results in a powder with excellent flowability and calendering properties, making it suitable for tablet production. The resulting granules have improved strength and reduced risk of delamination or cracking. In industrial settings, spray drying is commonly used for granulation. The basic principle involves spraying a slurry containing the binder into a drying tower using an atomizer. As the droplets fall through the tower, they are dried by hot air, forming solid granules. These granules are collected from the bottom of the tower.
Process Flow:
The pressure spray granulator consists of several key systems: feeding, drying, dust removal, heating, and electrical control. Each system includes various components that work together to ensure efficient operation.
The feeding system comprises a mixing tank, filter, diaphragm pump, and spray gun. The ball-milled slurry is transferred from the mill to the mixing tank, then pumped through the diaphragm pump and sprayed into the drying tower via the spray gun.
Once inside the tower, the slurry undergoes three main stages:
1. **Slurry Atomization**: The slurry is pressurized and forced through the nozzle, converting pressure energy into kinetic energy. It forms a high-speed liquid film that breaks into droplets. The size of these droplets is inversely proportional to the pressure, while the throughput is proportional to the square of the pressure.
2. **Drying and Spherical Formation**: The droplets mix with hot air entering from the top of the tower. Due to surface tension, the droplets take on a spherical shape as moisture evaporates quickly. This results in dry, uniform granules.
3. **Granule Collection**: The dried particles settle at the bottom of the tower and are collected in a funnel-shaped chamber. Finer particles are drawn up by an extractor and sent to the dust removal system for further processing.
The drying system includes a blower, drying tower, and exhaust fan, responsible for circulating hot air. The dust removal system uses a cyclone separator, bag filter, and centrifugal fan to capture fine particles and ensure clean exhaust. The heating system, made up of electric heaters and a gas furnace, provides the necessary heat for the drying process. An electrical control system monitors and regulates the entire operation.
Daily Operation:
Before starting, all connections, seals, and lubrication points should be checked. Power is turned on to verify voltage and instrument readings. Slurry levels and concentration in the mixing tank must be confirmed. Once ready, the blower and exhaust fan are activated, followed by the heating system. When the outlet temperature reaches around 130°C, the material pump and dust removal system are started. After reaching 2 MPa pressure, the spray gun is activated. Operators should monitor atomization and pump performance regularly, cleaning or replacing nozzles if clogged.
During normal operation, materials are fed at set intervals, and system functions are checked periodically. Process parameters are recorded, and the vibration filter screen is kept clean. At the end of the run, the heater is turned off first, followed by the spray gun and pump. The tower is cleaned after the temperature drops below 100°C.
In emergencies, the equipment must be shut down immediately. If there’s a power outage, the gas engine should be manually operated to cool the tower, and the slurry line should be drained and cleaned.
Maintenance:
Regular maintenance is essential for ensuring smooth PTC production. Cleaning and inspection help identify issues early, reduce downtime, and maintain operational stability. Over time, blockages may occur in the equipment, requiring shutdowns for cleaning. The drying tower can be cleaned by opening the access door and rinsing with water. Cyclones and bag filters also need periodic cleaning to prevent dust buildup.
After about 600 hours of operation, the system should be inspected for wear and tear. Nozzles, pumps, fans, and heaters should be checked and maintained as needed. Electrical components and control systems should also be verified for proper function.
For more extensive maintenance, the equipment should be partially disassembled after approximately 2400 operating hours, typically during scheduled shutdowns. Regular care ensures long-term reliability and efficiency of the granulation process.