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AAA) YANMAR DIESEL ENGINE
DL20/22/28/ DK20 / DK 28
UEC37H-IIB/ UET37/88HA/UEC45HA.LA/ UEC52HA.LA/ S6B/
6EL30/ EL(S)32 /6EL(S)35/ 6EL38/ 6EL40/ 6EL(S)44/50A/
GGG) MAN B&W
III)SULZER
RND 68 RND 76 RD 44
JJJ) MAKITA
GSLH – 633 637 KSLH -633 637
Kkk) PIELSTICK
PC 2-5 PC 2-6
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As a new technology, the ultra-fine pulverization technology was gradually taken seriously by relevant research departments and the pharmaceutical industry in China in the 1990s. Many of the theories of this technology are still in the stage of continuous exploration. With the continuous improvement and development of measurement technology and pulverization theory, “superfine pulverization technology and ultrafine pulverizer†will be more widely used in the pharmaceutical field in China.
Superfine pulverization technology is a new technology that has emerged in the past decade. It has greatly extended the concept of smashing on the basis of traditional smashing technology. Among various superfine pulverizing machinery and equipment, there are currently airflow pulverizers (mainly including five basic types: horizontal disc airflow pulverizer, circulating tubular airflow pulverizer, counter-injection reverse airflow pulverizer, and impact plate target type). The airflow pulverizer and the fluidized bed airflow pulverizer are widely used in the pharmaceutical industry, and in the jet mill, the fluidized bed type airflow superfine pulverizer is widely used.
There are three kinds of defects in the traditional equipment. The main system of the large fluidized bed type airflow superfine pulverizer consists of an air compressor, an air purifier system, a supersonic airflow pulverizer, a classifier, and a cyclone separator. The medium and small fluidized bed type airflow superfine pulverizer usually combines a supersonic jet mill, a classifier and a cyclone into an integrated machine, which can greatly save floor space and facilitate installation, transportation and use.
At present, the fluidized bed type airflow superfine pulverizer used in the production of the pharmaceutical industry, including the multi-nozzle, fluidized bed, horizontal grading and gas sealing technology, realizes diversified flow field and laminar flow. System and horizontal classification system. However, since the nozzles designed in this pulverization mode are arranged in parallel and symmetrically along the inner wall of the pulverization chamber, the opposite directions (ie, horizontal spurting) are formed only in a single plane, so that the material to be pulverized can only be in an approximately planar manner. The smashing in the range leads to the following defects:
1. The bottom of the crushing chamber is convenient for unloading, and is designed to be conical. The material sent into the crushing chamber by the feeding device, once it falls into the cone located under the crushing chamber, the material enters a blind zone and cannot continue. Smash it.
Second, the comminution area is limited to an approximate plane, and the area is narrow, so that the material is less likely to be entrained, impacted, squeezed and rubbed by the airflow.
3. The conventional structure makes the fluidization state of the material in the pulverization process limited to the upper side of the nozzle, and the material deposited in the cone below the pulverization chamber cannot form a fluidized state.
The above defects are the main reason for the high energy consumption and low efficiency of the conventional fluidized bed type ultrafine airflow pulverizer.
New equipment to achieve "three-dimensional injection"
In view of these defects in the traditional fluidized bed type ultra-fine airflow pulverizer, the researchers of Beijing Weiling Muxin Machinery Equipment Co., Ltd., after more than ten years of research and development, successfully developed a new one by changing the nozzle setting of the traditional pulverizer. The first-generation fluidized bed type airflow superfine pulverizer--medical grade WLFM-P special model, and applied for national patent.
The nozzles of the series are arranged in the same plane around the crushing chamber, forming a certain angle with the plane, and the nozzle is symmetrical downward; meanwhile, a vertical upward nozzle is arranged in the center below the crushing chamber, and all the nozzle center lines are common Convergence at one point, and the resultant force is zero. This nozzle setting breaks through the drawbacks of the conventional fluidized bed type jet mill pulverizing area which is similar to the plane. It has been verified by production practice that compared with the traditional models, the new models can increase the efficiency by 1~2 times under the same energy consumption, thus greatly reducing the production cost.
According to the company's technical director, the new model has developed the crushing area from an approximate plane shape to a three-dimensional shape, greatly expanding the crushing area of ​​the fluidized bed type jet mill, so that the material to be crushed has gained more in the crushing chamber. The chance of collision, squeezing and mutual friction. In addition, since the upward nozzle is arranged below the conical bottom of the crushing chamber, the material falling into the cone of the crushing chamber can be timely pulverized by the high-speed airflow emitted from the nozzle, and the blind zone in the cone below the crushing chamber is eliminated. Therefore, the bottom-up pulverization chamber, the feed chamber, and the classification chamber form a complete fluidized state under the action of the jet stream. Under the joint action of several nozzles, the material gathers into a conical shape and is pulverized in an instant.
In addition to completely changing the nozzle setting, this model also adopts a new sealing device, which is different from the static and dynamic ring seal device or labyrinth seal device of the traditional model, but uses a fully enclosed air seal without running parts. Therefore, no wear is generated, and the equipment is operated more smoothly and safely.
The company's technical director pointed out that the new model meets the relevant requirements of GMP, and the running performance is more secure and reliable. Not only the choice of materials is strictly in accordance with the requirements of GMP equipment, but also the structural design fully meets the needs of convenient disassembly and automatic cleaning (CIP/SIP). The main machine is connected by flange, joint bolt and quick-fit clamp; the bearing adopts multiple sealing devices and special grease, so that the equipment can run stably for a long time under high-speed operation, the grease does not overflow, and the product safety is ensured from the source; all the welding ports of the product Both are polished and leveled, the inner and outer surface roughness is only 0.4~0.8 microns; the control system adopts PLC (programmable logic controller) mode, which replaces the traditional operation of the open and close valve through the panel button control, which not only reduces the labor intensity, It also reflects the humanized design.
Strictly follow production control The company has accumulated a lot of practical experience in the development and use of fluidized bed airflow superfine pulverizer. The technicians stressed that when choosing a new type of crusher, its control must meet the following requirements:
1. Strictly control the amount of feed. The material concentration is low, the probability of contact between materials is small, and the material concentration is high, which will affect the airflow speed. Therefore, the air pressure, the nature of the material and the characteristics of the body should be strictly controlled during operation. The material feeding speed should be strictly controlled; It is determined by its own characteristics that a screw feeder, an oscillating feeder or a star feeder can be used to ensure that the energy source in the pulverizing chamber is continuously supplied with materials to meet the material concentration in the pulverizing chamber.
2. Optimize the hierarchical structure. Grading is a crucial part of the ultrafine pulverizing system. The fluidized bed airflow superfine pulverizer has a remarkable feature that it can realize continuous feeding and discharging, preventing excessive pulverization of materials and unnecessary energy consumption. According to the turbine classification principle, the diameter of the classification wheel should be increased, the rotation speed should be increased, and the air flow rate should be reduced to ensure the separation particle size of the classifier is small.
3. The original material entering the superfine pulverizer should be as small as possible. In order to achieve this, pre-pulverization treatment should be carried out using an ordinary mechanical pulverizer before superfine pulverization, which is a direct and effective method for saving energy and increasing unit yield.
4. Ensure that the airtightness requirements of the entire closed system of the equipment, including the piping, valves, and equipment envelopes, should not be leaked. Thereby, valuable aerodynamic energy is concentrated on the nozzle to ensure a reasonable gas flow rate and pressure, and to increase the probability of impact of the particles.
5. The product collection and dust collector should ensure smooth ventilation and should not be too resistant. This part of the system device must ensure that the qualified products are collected and the environmental requirements are ensured, but the equipment is too complicated, which will bring too much burden to the overall work.
K(D)L, KFL-T, 6MAL-H/T/HT/DT, S165-T/ST/EN,
S185-ST/UT/ET, M200L-UN/SN/EN/M220L-UN/SN/EN / N 330
BBB) DAIHATSU DIESEL ENGINE
PS22/26/ DS18(A)/ DS(B)22/
CCC) NIIGATA DIESEL ENGINE
6L(M)25BX/6M28AFTE/BX/6M31X/EZ/EX/ 31AFTE /34AGT
DDD) AKASAKA
AH30/AH38/ AH40/D/F/ A31/34/37/41/ DM28/30/33/36/38/40(A)K/ DM46/ UEC37H-HB/ UEC 37/88H
UEC 37LA/ UEC45LA/ UEC52LA/ UEC52HA/ UEC60HA/ UEC60LS/ UEC45HA/115 ALL UET TYPE
EEE) MITSUBISHI (KOBE AND AKASAKA )
45/75C/ 45/80D/ 52/90D/ 52/105D.E/
ETC
FFF) HANSHIN
6LU(D)26/ 6LU(N)28A/ 6LU(D)32/6LU(D)35/ 6LU(S)38/ 40 / 6LU40/ 6LU46A/ 6LU50A/
S35MC/L35MCE/L50MCE/ L60MCE/ 40/54A
HHH) MITSUBISHI PURIFIER
SJ700~SJ1800/SJ 2000
How to improve the efficiency of airflow ultrafine pulverizer
A number of studies have confirmed that when the solid material is ultra-finely pulverized in the production process of the micron or even nanometer size, the physical and chemical properties of the substance will be greatly changed, thereby significantly improving the dissolution of the drug. And can reduce the toxic side effects of the drug. Both internal and external use can significantly improve the efficacy. Especially in the field of traditional Chinese medicine, ultra-fine pulverization technology can change the traditional Chinese medicine method. After the ultra-fine pulverization and refinement, the Chinese medicinal materials can be directly used for oral administration, thus eliminating the cumbersome process such as decoction pieces and boiling, which greatly facilitates the patient. In addition, the research shows that the amount of Chinese medicine used in ultra-fine refining is only one tenth of the amount of the original prescription, which greatly saves precious resources of Chinese herbal medicines and effectively protects the cultivation environment of Chinese herbal medicines. In addition, through the ultra-fine pulverization technology, the effective product which is insoluble or slightly soluble in water can significantly improve the bioavailability of the drug through cell wall breaking. This has opened up a new way for Chinese medicine to go global.