Overview

According to URS, the object of the product to be crushed is a special product that belongs to multiple varieties, multiple forms, and is mainly composed of fibers. At the same time, in the crushing production, it is necessary to meet the increasing requirements of modern Chinese medicine production. Some varieties can achieve a particle size of>300 mesh or more. The production process meets the requirements of GMP production. Therefore, the design of the process route and equipment configuration for material crushing is as follows:

Important instructions for process design

1. Equipment combination selection

The system is designed as an organic combination of mechanical crusher and airflow crusher. Different mechanical crushers can be selected according to the physical properties of raw materials. If it is for crushing mixed Chinese medicinal materials, TJZ crusher can be chosen. If it is for crushing paste or oily, flexible materials, you can choose TJG crusher. If it is for crushing single fiber materials, you can choose TJD multi machine crusher. Airflow pulverization can also be chosen. If it is to pulverize large quantities of single products, TQX rotary jet airflow pulverizer can be selected. If it is to pulverize multiple types of materials, TQG fluidized bed airflow pulverizer can be selected.

The device models respectively represent:

TLZG: represents the organic combination of TJZ and TQG

TLZX: represents the organic combination of TJZ and TQX

TLDG: represents the organic combination of TDF and TQG

TLDX: represents the organic combination of TDF and TQX

TLGG: represents the organic combination of TGF and TQG

TLGX: represents the organic combination of TGF and TQX

1. Process selection

1) If the crushed product reaches 80-200 mesh powder, only use a mechanical crusher and close valve 2 Turn off the airflow crusher, and the powder will enter the collection system directly after classification.

2) If the crushed product needs to reach a powder size of 200-1000 mesh, a mechanical crusher is used for pre crushing, and valve 1 is closed during crushing. After the product is crushed, it directly enters the rotary jet airflow crusher. The capacity matching of two crushers can be adjusted through TJZ's airflow classifier.

3. The system adopts sieve free grading, which allows for online and stepless adjustment of powder particle size, avoiding difficulties in sieving and replacing screen mesh. And the grading wheel has a long service life. Our company's grading wheel warranty period is three years, and customers do not have to worry about sieving within three years.

4. The machine type pulverization and airflow pulverization can operate independently

5. Combination machines share a collection system

Two component system (taking TJZ+TQX as an example)

1. Equipment Name: TLZX550/40 (TJZ550+TXX40) Multi functional linkage dust-free crushing and grading system (hereinafter referred to as: TLZX)

2. Equipment composition: Standard structure: feeding box, translation conveyor, TJZ550 crusher, TJZ classifier, TQX rotary jet crusher, TQX classifier, cyclone collector, isolation collector, induced draft fan, control system, operating platform

Air source system: air compressor, air storage bag, air cooler, air filter (provided by the customer or entrusted to our company for purchasing)

Three working principles

1. Mechanical crushing principle

Design purpose:	Organic combination of multiple crushing forces, suitable for crushing various traditional Chinese medicine raw materials.
Crushing principle:	The material (≤ 6cm) is sent into the crushing chamber under the negative pressure of the fan suction. The interior of the crushing chamber is divided into three central connected crushing areas by partitions, each of which is equipped with a coaxial rotating crushing device. The first crushing area is a pendulum device, the second crushing area is a pendulum blade device, and the third crushing area is a fixed cone blade device. In the first crushing area, the impact performance of the pendulum is utilized to facilitate the pre crushing of the powder; Utilizing the shear performance and high crushing kinetic energy of the blade in the second crushing zone is beneficial for the strong crushing of the powder; Crushing with a fixed cone knife in the third crushing zone is beneficial for controlling the particle size of the powder.
	Each crushing zone is equipped with a fixed gear ring around it. During crushing, the pendulum, swing knife, and fixed cone knife rotate at high speed, while impacting, shearing, and grinding the material to achieve crushing.
Equipment function:	Using the impact, shear, grinding and other forces of the grinding tool, the raw material particles are crushed to 80-150 mesh micro powder
Process steps:	1. The material is fed into the crushing chamber by the feeding machine, and is crushed under the action of swinging knives, swinging hammers, and inclined knives. 2. The crushed mixture quickly leaves the crusher and enters the classification chamber under the negative pressure of the induced draft fan. 3. Unqualified materials enter the crushing chamber again through the return port.

　2. Principle of airflow pulverization

TQX rotary jet airflow crusher

Crushing principle: Purified and dry compressed air is introduced into Laval nozzles installed at several opposite positions in the crushing chamber, forming a supersonic airflow. The nozzles can rotate and adjust their rotation speed according to different materials. The materials are transported from the hopper to the crushing chamber and accelerated by supersonic airflow, becoming high-speed moving jets that collide with each other at their intersections; Due to the adjustable rotating supersonic airflow inside the crushing chamber, the distance from the material in the crushing chamber to the intersection point is always the shortest, which greatly improves the crushing strength and efficiency. Compared with the original fluidized bed crusher, its production capacity is increased by 50%. This is the basic principle of the new generation of advanced airflow pulverization.

Equipment function: Utilizing opposing supersonic airflow to transport animal materials at high speeds and causing collisions at intersections. Grind 60 mesh material particles into ultrafine powder ranging from 0.5 to 40 microns

3. Classification principle

TJZ grading/TQX classifier

Grading principle: It is difficult to obtain powders below a few microns using ordinary sieving methods. Therefore, micro powder crushing systems must be equipped with grading equipment.

Main configuration: grading motor, grading wheel, grading chamber assembly

Equipment function: Through a specially designed grading wheel, the powder particle size can be infinitely adjusted online (adjustment range: 40-0.5 microns) to control the powder particle size. Qualified powder enters the collection system through induced draft, while unqualified powder is returned to the crusher. The air hammer oscillator can prevent powder from sticking to the wall.

　Classification principle:

The grading technology we propose is that the material enters the grading zone with the airflow and generates a horizontal centrifugal force field under the high-speed rotational force of the grading wheel (the size of the centrifugal force field can be adjusted by frequency conversion). Powder particle A is subjected to two forces in a certain centrifugal force field.

One is the centrifugal force F generated by the rotation of the grading wheel driving particle A to rotate, F = K₁d³Vt².

Secondly, due to the influence of the induced draft fan, particle A generates a centripetal force F 'that runs towards the center of the grading wheel rotor.

F '=K₂d Vr。

When F=F ', particle A undergoes circular motion, and we define the diameter of particle A as the critical particle.

Assumption: There are two other particles B in this centrifugal force field C ， If particle C dc>da, then Fc>Fc ', particle C moves towards the edge wall of the container. If particle B db<da, then Fb

From the above formula, we can see that the F and F 'of critical particles are also influenced by Vt and Vr.

Assuming that the gravitational force of the induced draft fan remains constant, then Vr remains unchanged. If the speed Vt of the grading wheel is increased, then F>F ', and particle A moves towards the edge wall of the container. With the operation of the centrifugal classification device, the powder is subjected to a centrifugal force greater than the carrying force of the airflow, causing the powder particles to fly towards the edge wall of the classification chamber in the direction of the impeller and fall along the edge wall, returning to the crushing chamber and being crushed again by the crusher. On the contrary, if Vt is reduced, F

Four system characteristics

1. Organic combination of crushing structure

Organic combination of 5.11 model pulverization and airflow pulverization

The system is designed for one machine with multiple uses, namely:

① If the desired finished product is 80-150 mesh powder, start the TGF crusher and close valve 2 Turn off the airflow crusher and allow the powder to directly enter the collection system.

② If the desired finished product is 300 mesh or 1000 mesh powder, close valve 1 TGF serves as a pre crusher, and the crushed material enters the rotary jet airflow crusher. The capacity matching of the two crushers can be adjusted through the airflow classifier of the TGF crusher.

5.12 Model crushing internal structure organic combination (taking TJZ as an example)

① Wide crushing range - suitable for crushing drugs with different properties

The crushing chamber organically integrates various crushing forms such as impact, shear, and grinding, and is designed with three crushing zones, which can be applied to the processing of materials with different properties. If necessary, the crushing form of the first two crushing zones can be unified.

The main workflow of this equipment for crushing is "pre crushing strong crushing fine powder crushing", and its effectiveness is reliably guaranteed by the structure of each zone in the crushing chamber. 1、 The diameter of the secondary crushing zone gradually increases, and the gap between the fixed teeth on the inner circumference and the rotating crushing blade decreases from large to small. The rotating crushing blade changes from flexible to rigid, and the slope partition between the two crushing zones moderately restricts the flow velocity of the crushed material, effectively ensuring the crushing effect

② Fine crushing particle size - the crushing fineness can reach 250 mesh

5.13 Characteristics of Airflow Grinding

1) Pollution free crushing

This pulverization is a non-contact pulverization process, which is completely achieved by the high-speed movement and collision of the material itself driven by high-speed airflow. Avoiding secondary pollution during crushing.

2) High kinetic energy for crushing

The supersonic airflow generated by the device reaches a speed of over 3 Mach, which gives the material a great deal of kinetic energy. When the material collides, it is converted into a strong impact force, and the fineness of the crushed powder can reach 0.5 microns

3) Low crushing temperature

Due to the adiabatic reaction of gas expansion, a large amount of heat is absorbed; The material temperature in the crushing room is within 10 ℃

　2. Relative separation of crushing and grading - relative separation between crushing chamber and grading chamber

The crushing process is a heating process. To reduce heat, the first step is to reduce the amount of heat that should not be generated, and the second step is to promptly dissipate the generated heat. The effective method is to separate the crushing chamber from the grading chamber, and the crushed material enters the grading chamber without stopping after being crushed in the crushing chamber.

1) Avoid over crushing

Reduce the amount of heat that should not be generated, and lower the crushing temperature by 20-30 ℃ compared to similar equipment

2) Realize effective crushing

The material enters the grading room, and after being "screened" by the grading wheel, the coarse particles return to the crushing room. For crushing, each crushing is effective, thereby increasing the crushing capacity. 20-30% increase in output compared to similar crushing equipment

　3. Non sieving online stepless grading - using grading wheels for grading to avoid difficult sieving phenomena

1) The specially designed grading chamber and vertical grading wheel with variable frequency speed regulation do not require a sieve, and can adjust the product particle size online and continuously at low speeds. The cyclic feeding structure strictly limits the "large particles" and avoids over crushing, resulting in a narrow particle size distribution and uniform particle size of the product; Avoiding the difficulty of sieving powders with a mesh size of 150 or more.

2) Due to the low-speed operation and long service life of the grading wheel, the warranty period of this device is three years. Within three years, customers will not be confused about problems such as screen damage, difficulty in sieving, and replacement of screens

　　4. System negative pressure operation for dust-free conveying

The entire system is fully enclosed and operates under negative pressure, effectively eliminating heat from the crushing chamber and system, and preventing powder leakage during the crushing process. There is no environmental pollution and low noise

　　5 Full process automatic program control

The entire process of the system is controlled by PLC program, especially according to the usage load of the crushing motor, the feeding speed is uniformly adjusted to ensure the uniformity of the crushing particle size

6 Independent intake and exhaust systems

The required air volume for this system adopts an independent air intake configuration, and the air source is purified. Do not disrupt the air balance in the purification workshop. The dust emission from exhaust is ≤ 50mg/nm3, far below the national standard. Can be directly discharged into the air

7. Complies with GMP requirements

The main channel for crushing materials in this system is a circular tube structure, which adopts bolted, seamless, and clamp connection forms, with no dead corners, reliable sealing, low noise, and simple disassembly, assembly, and maintenance. Develop a traditional Chinese medicine grinding system that meets GMP requirements

　8. Long service life of vulnerable parts

The vulnerable parts of the system are made of impact resistant high-speed tool steel and undergo comprehensive heat treatment. The service life is 2-3 times longer than that of similar products.