1 TJD Overview

We have applied crushing theory and combined it with the actual situation of the enterprise to carry out "technological innovation" on the crushing equipment to overcome the problems existing in the current mechanical impact crusher. There are four main "innovative points":

1) Organic combination: Combine the fixed piles, swinging knives, or swinging hammers currently mechanically crushed in the crushing chamber. Realize stacked crushing, the stacked crushing device can improve the crushing capacity,

2) Relatively separated. In general crushing machinery, the crushed material often stays in the crushing chamber for a long time due to the barrier of "sieving", resulting in the phenomenon of "over crushing". We adopt a structure of relative separation between the crushing chamber and the grading chamber, which separates the crushed mixed materials from the materials that have been completely crushed in the grading chamber. Qualified materials enter the collector, while unqualified materials return to the crushing chamber. In this way, in the crushing chamber, each crushing is effective, thereby increasing the crushing capacity and avoiding the "excess heat" generated by "over crushing", relatively reducing the crushing heat.

3) No sieve grading. Grinding machinery usually uses a mesh screen with fine pores to grade the crushed powder. Our specially designed grading chamber and vertical grading wheel with variable frequency speed regulation do not require a sieve and can classify powder particle size at low speeds. In addition, in conjunction with the cyclic feeding structure, it strictly limits "large particles" and avoids "over crushing". Therefore, the product has a narrow particle size distribution and uniform particle size; It also avoids the difficulty of sieving powders with a mesh size of 150 or more.

4) Negative pressure operation. The entire system of the new crusher adopts negative pressure operation, which can provide centripetal force for the classifier, take away the heat of the system, and prevent powder leakage during the crushing process, without environmental pollution.

Overall description of process route

Process route: The material is manually fed into the automatic feeding machine. After being subjected to strong magnetic iron removal, the screw of the automatic feeding machine uniformly adds the material into the crushing chamber according to the instructions of the PLC, and performs three-stage crushing in the crushing chamber. Firstly, enter the first layer of crushing area for impact pre crushing, then enter the second layer for shear crushing, and finally enter the cone knife crushing area for grinding crushing. The crushed material enters the classification chamber through the guide pipe, and under the action of the classification wheel, a horizontal centrifugal force field is generated (the size of the centrifugal force field can be adjusted by frequency conversion). Unqualified materials are returned to the crushing room for further crushing. All qualified materials enter the collection system through negative pressure, with 88-92% collected by cyclone collectors and 10% collected by isolation collectors. The collected materials are separately entered into the material bucket

2、 System composition description

1. Equipment Name: TJD stacked dust-free crushing and grading system

2. Equipment composition: Standard structure: It consists of six parts: feeding machine, crushing and grading system, cyclone collection, isolation collection, induced draft system, and PLC electrical control device.

Auxiliary equipment: air compressor (for pulse blowback)

3、 Working principle

Crushing principle

This crusher utilizes the impact, shear, and grinding forces of three layered crushing tools to crush raw material particles into 100-120 mesh micro powder.

The pulverizer in this multi combination dust-free pulverization and classification unit includes a rotating pulverization device installed in the pulverization chamber shell, and a fixed pulverization device installed on the shell and cover plate. The rotating crushing device consists of a circular gear ring crushing device with rotating double-layer inner and outer teeth on the first and second layers, and a swinging knife crushing device on the third layer. The fixed crushing device includes a circular fixed crushing device (referred to as the front cover ring gear) with double-layer inner and outer teeth installed on the front cover plate, which is interlocked with the rotating ring gear crushing device. 2. The inner ring of the shell is equipped with a gear ring (referred to as the shell gear ring), which forms a shear surface with the swing knife. (See the structure of the crusher in the figure below)

The interlocking of the fixed crushing device and the rotating crushing device forms six crushing points, as shown in the following figure

The crusher is a stacked multi-layer multiple crushing machine, with the first crushing point being the shearing and crushing of the material by the rotating gear ring; The second, third, and fourth crushing points are respectively the inner and outer two-layer shearing and grinding crushing of the rotating gear ring and the front cover gear ring. The fifth and sixth crushing points are the shearing and crushing of the fixed pile under the swinging knife and the swinging knife and the shell gear ring. The coaxial six crushing points can improve the crushing ability of strong fiber materials. The first layer of rotating and fixed bite crushing device utilizes its impact performance, which is beneficial for crushing various harder and larger materials; By utilizing rotating and fixed devices and the shear performance of blades in other crushing zones, it is beneficial to crush various fiber materials. Ultimately meeting the need for "micronization" of strong fiber traditional Chinese medicine.

Classification principle

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.

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.

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 runs towards the center of the grading wheel rotor

Centripetal force F ', 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