CN201135896Y - Bottom direct transmission and inner return step type superfine pulverizer - Google Patents

Abstract

The utility model relates to a step-type superfine pulverizer with direct transmission and internal return, which belongs to the technical field of pulverization equipment widely used in industries such as chemical industry, building materials, metallurgy and non-metallic mines. Impeller, grading impeller, grading chamber, classifier and inner return channel. The motors are installed under the pulverizer, connected through flexible couplings, and fixed on the foundation respectively. The throwing tray, crushing impeller, and grading impeller are fixed on the main shaft from bottom to top in sequence. The crushing chamber is composed of several steps, and the peripheral liner is divided into several small compartments by the erected corner liner. The classifying chamber communicates with the outlet provided above through the classifying impeller. One side of the crushing chamber is provided with a feeding pipe. This pulverizer has strong crushing ability for pigments, inorganic chemical raw materials and non-metallic minerals, with fine particle size, high output, low energy consumption and small mechanical vibration.

Description

Bottom direct transmission and inner return step type superfine pulverizer

technical field

The utility model relates to a step-type superfine pulverizer with direct transmission from bottom to bottom and internal return material, which belongs to the technical field of pulverization equipment widely used in industries such as chemical industry, building materials, metallurgy and non-metallic mines.

Background technique

The utility model 012290769 "multi-layer centrifugal collision ultra-fine pulverizer" has the advantages of high collision probability of material particles, large collision force and strong crushing ability, but there are several structural disadvantages: 1. The pulverizer is usually connected with the dust removal system It is superfluous to set up a feeding fan impeller, which consumes the energy of the main motor; 2. The grading impeller is only one level, which makes it difficult to control the fineness of the product; 3. The grading chamber and the crushing chamber are one room. The coarse particles separated by the impeller are easy to mix with the fine particles, resulting in reduced classification efficiency; 4. The upper and lower diameters of the crushing chamber are almost the same, and the air velocity is also the same, so the classification effect of each layer is not obvious; 5. Although the crushing rod rotates at high speed, there are many 6. The motor is directly fixed on the top of the pulverizer, the vibrations are transmitted to each other, interfere with each other, and may cause the danger of resonance.

Contents of the invention

The purpose of this utility model is to design a step-type superfine pulverizer with direct transmission and internal return to improve the pulverization efficiency and reduce energy consumption; improve the classification efficiency, increase the powder fineness and output; and ensure the stable operation of the machine.

The utility model is achieved through the following design proposals.

A step-type ultra-fine pulverizer with direct transmission and internal return, which is characterized in that the pulverizer includes a motor, a flexible coupling, a material rejection tray, 1-4 layers of pulverizing impellers and classifying impellers, and a classifier. The crusher and the motor are respectively fixed on the foundation, and the motor is installed under the crusher through a flexible coupling to drive the two directly. The throwing tray, 1-4 stage crushing impeller and grading impeller are fixed from bottom to top in turn. On the main shaft of the pulverizer, the main shaft is fixed on the upper and lower bearing seats, and an isolation cylinder, a classifier, and a discharge elbow are arranged in sequence above the upper bearing seat, and a multi-stage crushing chamber is formed between the throwing tray and the upper bearing seat. , the side wall is equipped with a liner and a feed pipe, the lower part is the air inlet chamber and the machine base, and the return channel of the outer ring of the isolation cylinder communicates with the crushing chamber.

1. Place the motor directly below the pulverizer, and directly connect the main shaft of the pulverizer with a flexible coupling. The pulverizer and the motor are respectively fixed on their respective foundations to avoid mutual transmission of vibration and make the main shaft of the pulverizer greatly shorten.

2. Fix the rear end cover of the motor on the motor support after modification, and then fix the support on the embedded parts of the foundation to make the motor stable and reliable.

3. The inner diameter of the crushing chamber is enlarged from bottom to top to form a stepped multi-stage crushing chamber, and each stage is divided into several small compartments by vertical corner linings. In this way, the crushing rod hits the powder on each step, causing the powder particles to collide, rub, and peel off, thereby improving the crushing efficiency. At the same time, as the diameter of the crushing chamber gradually expands from bottom to top, the air velocity decreases step by step from bottom to top, so that the particle size of the material changes step by step from coarse to fine, improving the classification efficiency.

4. A crushing impeller and a grading impeller are installed on each step of the crushing chamber, so that the powder in the crushing chamber can be crushed and classified in multiple stages.

5. Set up an isolation cylinder in the classification room. Under the action of the induced draft fan, the powder is introduced from the crushing chamber into the classifying chamber and reaches the classifier. The coarse particles separated by centrifugal force enter the return channel from the outside of the isolation cylinder and return downward to the crushing chamber. It avoids mixing the separated coarse powder with the fine powder, so as to improve the classification efficiency.

6. The classifier is driven by another motor installed above the pulverizer, and the speed can be adjusted by the motor itself according to the required powder fineness.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model "lower direct transmission and inner return step type superfine pulverizer":

In Fig. 1, 1 motor support, 2 motors, 3 flexible couplings, 4 main frame, 5 lower bearings, 6 grinder main shaft, 7 throwing tray, 8 throwing block, 9 crushing chamber, 10 liner, 11 corner liner, 12 wear-resistant block, 13 crushing rod, 14 crushing impeller, 15 classifying impeller, 16 upper bearing, 17 isolation cylinder, 18 classifying chamber, 19 classifying machine, 20 classifying machine shaft, 21 powder outlet, 22 raw material inlet, 23 inner return channel, 24 casing.

Below in conjunction with accompanying drawing, describe in detail the design content of the present utility model " step type ultra-fine pulverizer of direct transmission and inner return material " of the utility model.

Detailed ways

As shown in Figure 1, the shredder shell 24 is fixed on the base 4 fixed on the foundation embedded parts, the central main shaft passes through the lower bearing 5 located in the center of the base 3, and connects with the main motor through the flexible coupling 3 2 connected. The rear cover of the motor 2 is refitted and fixed to the motor support 1, and then the support is fixed on the embedded part of the foundation. In this way, the main frame 4 and the motor 2 are respectively fixed on their respective foundations, and the two are connected through the flexible coupling 3, so as to avoid mutual transmission of vibrations. On the main shaft 6, the throwing tray 7, 1-4 layers of pulverizing impellers 14 and classifying impellers 15 are installed sequentially from bottom to top. The upper end of the shaft is fixed on the upper bearing 16, and the upper bearing is fixed on the center of the flange below the classification chamber 18. 6-24 throwing material pieces 8 are equipped with on the periphery of the throwing tray 7 . Each level of circumference of the pulverizing chamber 9 is divided into 4-48 small compartments by the upright corner liner 11 , and the inclined pipe of the feeding port 22 on its side leads to the top of the throwing tray 7 . Evenly stretch out 4-24 root crushing rods 13 on the periphery of the crushing impeller 14, and wear-resistant blocks 12 are equipped with on the ends of the crushing rods. An isolation cylinder 17 is arranged on the lower flange of the classification chamber 18, and its outer circumference and the classification chamber 18 form an inner return channel 23 for the coarse powder to flow downward. A classifier 19 is installed at the upper outlet of the classifying chamber 18, and its center is connected with another motor through a classifier shaft 20, and the rotating speed of the classifier is controlled by this motor. Above the classifier is an elbow-shaped powder outlet 21 .

Function of the present utility model is realized through following work process.

The motor placed under the pulverizer directly drives the main shaft through a flexible coupling. Materials with a particle size of less than 40 mm enter the throwing tray from the raw material inlet, and under the action of centrifugal force, they quickly accelerate to a speed of more than 100 meters per second and hit the liner, which not only hits the powder particles on the liner, but also Self-shattering (self-shattering). Particles crushed by force splash at high speed, collide with each other and shatter. The lining board around the grinding chamber is divided into several small compartments by 4-48 vertical corner lining boards. The powder inside is not disturbed by the high-speed swirling gas, and relatively deposited. Under the impact, it is smashed by strong impact, friction, shearing and peeling. Under the pull of the induced draft fan, the fine powder particles are pulled to the upper layer by the small centrifugal force, and the coarse powder particles are thrown to the surrounding area by the strong centrifugal force to continue crushing. As the diameter of each layer of the crushing chamber increases from bottom to top, the diameter of the crushing rods increases, so that the upward air velocity of the upper layer is smaller than that of the lower layer, and the centrifugal force is greater, which causes the upper layer to be larger than the lower layer. The powder in one layer is finer. The grading impeller set on the top of the crushing chamber blocks the coarse powder again, so that the fine powder enters the classification chamber through the isolation cylinder, and the classifier on the upper side of the classification chamber further classifies, so that the fine powder is discharged through the discharge port, and the coarse powder is thrown away. Return to the surrounding return channel to return to the crushing chamber to continue crushing.

The advantages of the utility model "downward direct transmission and internal return stepped ultrafine pulverizer" are strong crushing ability, fine product particle size, low energy consumption, small mechanical vibration, stable operation and convenient maintenance.

Claims (3)

1. a kind of step-type ultra-fine pulverizer of returning material directly in the next transmission, it is characterized in that, this pulverizer comprises electric motor, flexible shaft coupling, throws away material pan, 1-4 layers pulverizes impeller and classifying impeller, classifier, so The pulverizer and the motor mentioned above are respectively fixed on the foundation, and the motor is installed under the pulverizer through a flexible coupling to drive the two directly. It is fixed on the main shaft of the pulverizer, and the main shaft is fixed on the upper and lower bearing seats, and the isolation cylinder, classifier, and discharge elbow are arranged successively above the upper bearing seat, and multi-stage crushing is formed between the throwing tray and the upper bearing seat. The side wall is equipped with a liner and a feed pipe, the lower part is the air inlet chamber and the machine base, and the return channel of the outer ring of the isolation cylinder communicates with the crushing chamber. 2. The pulverizer according to claim 1, characterized in that, the rear end cover of the motor is refitted and fixed to the support, and the motor is fixed on the foundation through the support. 3. The pulverizer according to claim 1, characterized in that, the internal diameter of the pulverizing chamber increases step by step from bottom to top, each stage has a pulverizing impeller and a classifying impeller, and the pulverizing chamber is surrounded by The lining of the ring is divided into 4-48 small compartments by vertical corner linings.

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