At present, the vacuum conveying system is the most advanced, ideal and perfect material conveying equipment for powder, granule, powder and mixing in China. The vacuum conveying system can automatically transport various materials to the hopper of the packaging machine, tablet press, pulverizer, etc., and can also directly transfer the mixed materials to the mixer (such as V-type mixer, two-dimensional mixer, In the three-dimensional mixer, etc., the labor intensity of the workers is greatly reduced, and the problems such as dust overflow during the feeding are solved, which plays a certain role for the pharmaceutical factory to pass the GMP certification.

In recent years, international vacuum delivery systems have been widely used in many industries, especially in the pharmaceutical and food industries. How to choose vacuum conveying system equipment? Which manufacturer's equipment is selected? This has become a problem that every enterprise should face. At present, the equipment produced by the various manufacturers of the relevant vacuum conveying system has little difference, and each has its own advantages. How to select a suitable vacuum conveying system for each pharmaceutical company becomes the key.

1. How to choose the manufacturer of vacuum conveying system that meets the requirements

According to the process requirements, collect and sort out the equipment information of the relevant manufacturers, conduct comprehensive evaluation of the equipment and manufacturers, and compare the various vacuum conveying equipment on the market for pre-confirmation.

The key points are as follows:

(1) Process adaptability. Since the nature of each material is different from the production process, it is first necessary to select the appropriate model for the process requirements;

(2) Production capacity. According to the company's production capacity requirements, find the matching technical parameters in the manufacturer's sample, and make appropriate amplification to meet the production capacity requirements;

(3) Equipment material. The material of the contact part with the drug shall comply with the GMP regulations, and the entire vacuum conveying system shall have no dead angle and cleaning dead zone;

(4) Appearance structure. It is not easy to accumulate dust, beautiful and simple, easy to clean;

(5) Operational convenience. The vacuum conveying system is applied to reduce dust flying and reduce labor intensity. Therefore, the operation is simple, the controllability is strong, and the operation is convenient;

(6) Equipment performance. The equipment runs smoothly and reliably, the noise is relatively low, and the maintenance is convenient, especially the brand and performance of the accessory parts are especially critical;

(7) Equipment safety. There should be safety protection devices, especially the electrical department should have a guarantee that is consistent with national safety standards;

(8) Standardization of instruments. The measuring instruments shall comply with the measurement standards and comply with the corresponding calibration requirements;

(9) Manufacturer strength. With experience in supplying similar equipment, it can provide good cooperation in equipment installation, commissioning and technical training, and can provide perfect after-sales service, sufficient supply of spare parts and reasonable price of accessories;

(10) Price. Under the premise of ensuring production needs and excellent performance, we strive to provide high quality and low price;

(11) After-sales service. Ordering equipment after-sales service is crucial, and equipment from several different manufacturers should be given priority in the after-sales service under the same conditions. Generally speaking, after the equipment is installed and the test is passed, the warranty period is 12 months. 24 h on-site service is provided during the warranty period. After the end of the warranty period, the user should be provided with repairs, accessories and technical services.

2. Structure, principle and discharge method of vacuum conveying system

2.1, the structure of the vacuum conveying system

There are many types of domestic vacuum conveying systems. Now let's talk about the structure of a classic vacuum conveying system. It consists of vacuum pump, stainless steel suction nozzle, conveying hose, filter (can be selected by PE, 316L stainless steel, titanium metal, bag type, etc.), compressed air backflushing device, pneumatic discharge door device, vacuum hopper , automatic control of material level and electrical control.

2.2, working principle of vacuum conveying system

The jet vacuum generator creates a vacuum under the action of compressed air, the bottom valve is closed, a vacuum system is formed in the vessel and the delivery conduit, material is drawn from the feed station into the delivery conduit, and into the vessel to be fed. The filter is used for gas-solid separation to prevent dust and fine particles from being drawn into the vacuum generator and internal environment. When the material container is full, the vacuum generator stops working, the bottom valve opens, and the material is discharged from the container. At the same time, the backflushing device is activated to clean the filter. After this process, the generator starts up again and the system enters the next working cycle. Among them, the time of suction and discharge can be controlled by pneumatic control and electric control.

2.3, the discharge method of the vacuum conveying system

The discharging method of the vacuum feeding system is divided into two types: gap discharging and continuous discharging. The production enterprise can select the discharging method according to the conveying distance and the conveying materials. among them:

(1) The gap discharge mode is beneficial to reduce the investment cost of the equipment and facilitate the material level control;

(2) Continuous discharge mode is generally used for vacuum conveying of materials in long distance and large output.

3. Matching of vacuum conveying system and equipment

In terms of the matching of vacuum conveying systems and equipment, the following points should be considered:

(1) Whether the structure is simple and compact, easy to install and disassemble, and at the same time, it is necessary to consider whether the installation and the layer height can be easily repaired;

(2) It can be transported over a long distance, and its conveying volume should be appropriately large;

(3) Is it convenient to use and test? If a dual control system is adopted, the operation is flexible and the maintenance cost is low;

(4) It can achieve stable product performance and reliable operation. On this basis, it is also necessary to consider the realization of automatic control, especially in conjunction with equipment;

(5) Low noise, fully enclosed transportation, improving production and product quality;

(6) The equipment should be equipped with a backflushing system with good filtering effect;

(7) The vacuum delivery system should have a wider adaptability, such as tablets, pills, gypsum, decoction pieces, capsules, raw material granules/powder and mixed granules/powder.

4, how to choose a filter

The material of the filter determines the production capacity of the vacuum conveying system and the nature of the material to be conveyed. Because the varieties of different manufacturers are different, the material composition is different, some materials are strong, and some materials have relatively high viscosity. How to choose the filter for vacuum The conveyor system is very important. Several common filters for the vacuum conveyor system are summarized below:

4.1, titanium metal filter

Advantages: Titanium filter element is easy to clean and easy to dry. It is suitable for materials with various characteristics, especially suitable for materials with relatively high viscosity. The output is relatively large; disadvantages: the price is relatively high.

4.2, multi-layer stainless steel

The output is relatively low and is not used much.

4.3, PTFE polymer material

Advantages: the price is relatively low compared to the titanium metal filter element, and the cleaning is convenient; Disadvantages: the drying time after washing is relatively long, and if the drying is not thorough in the next use, the material is easily adsorbed on the surface of the filter rod during the suction, for sucking back Blowing creates obstacles that affect the next suction.

4.4, bag filter

This form is just like a bag-type dust collector, but this is directly in contact with the material. The material with relatively high viscosity will adsorb on the surface of the bag, affecting the suction capacity and the production capacity is relatively low.

5. Discussion on some technical issues

In the production process of the tablet press and the capsule machine, the vacuum suction machine often produces stratification of the powder particles. The reason is that due to the different density of the materials, there is a precedence when free fall, if the air flow control is advanced, It can prevent the stratification of the particles.

In addition, tablets, capsules and pills are prone to static electricity during production and transportation, which will seriously affect the production quality and product packaging accuracy. If the vacuum conveying system uses an all-metal structure, the material can be eliminated during the material conveying process. Static electricity to improve the quality of production.

6, the conclusion

This paper begins with how to select the vacuum conveying system that meets the requirements, describes the structure, principle and discharging method of the vacuum conveying system, and discusses the matching of the vacuum conveying system and equipment, and how to choose the filter. Some technical issues of the vacuum conveying system were discussed. It can be said that the vacuum conveying system combines pneumatic conveying and container conveying to realize the overall process of automatic, clean and sealed material transportation.

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