CN201817740U - Multi-stage fiber sieving machine for old paper stock - Google Patents

Abstract

A waste paper pulp multi-stage fiber screening machine is used to realize the separation of long fiber, medium long fiber and short fiber pulp. It includes a tank body, a driving device, a main shaft and a rotor installed on the main shaft. The tank body is provided with a slurry inlet and a slurry outlet. The inside of the tank body is divided into five cavities; the first cavity is provided with a slurry inlet The tank cover at the top of the second cavity is equipped with an exhaust port; the third cavity has built-in rotor blades, and a long fiber pulp pipe is set at the bottom of the third cavity; the bottom of the fourth cavity It is connected with the short fiber pulp outlet pipe; the lower part of the fifth cavity is connected with the medium and long fiber pulp outlet pipe. The utility model improves the defects of poor classification effect, vague classification ratio and high power consumption of pulp classification equipment, and more reasonably separates fibers in multiple stages to meet different needs and reduce production costs.

Description

Waste paper pulp multi-stage fiber screening machine

technical field

The utility model relates to a pulp screening machine for screening waste paper pulp, in particular to a waste paper pulp multi-stage fiber screening machine.

Background technique

Pulp screener is a common equipment for screening pulp after waste paper pulping. By stirring the fluid pulp, the pulp will pass through the pressure sieve under the action of pressure. The length of the slurry is sorted. According to the filtering form of the screen, it is divided into hole type and slot type. Whether the pressure screen is perforated or slotted, it has a similar structure: the screen body (tank body), including the outlet, inlet, upper cover and support. In order to effectively separate the large-scale impurities in the pulp from the coarse stock, it is necessary to dilute the stock to an appropriate concentration.

The structure of the existing pressure screen is bulky, the separation effect of long-fiber, medium-long-fiber and short-fiber pulp is not obvious, and the equipment occupies a large space.

Utility model content

The purpose of the utility model is to provide a compact waste paper pulp multi-stage fiber screening machine, which can realize the separation of long fiber, medium long fiber and short fiber pulp, adopts double screen design, and has high separation efficiency.

The technical scheme adopted by the utility model to solve the technical problems is: this kind of waste paper pulp multi-stage fiber screening machine includes a tank body, a driving device, a circular filter screen, a main shaft and a rotor installed on the main shaft. It is equipped with a pulp inlet and a pulp outlet, and its characteristics are:

The upper end of the tank body is open, and a tank cover is installed at the opening;

The rotor is composed of a rotating disk and blades fixed on the rotating disk;

The main shaft is installed vertically, and the first round filter screen and the second round filter screen arranged coaxially with the main shaft divide the inner space of the tank body into three parts, forming three cavities inside, middle and outside, and the outer cavity is covered by a The transverse partition is divided into the upper first cavity and the lower fifth cavity, the hollow cavity is the third cavity, and the inner cavity is divided into the upper second cavity and the lower fourth cavity by the rotor Cavity;

The first cavity is provided with a slurry inlet and a heavy slag pipe;

The tank cover at the top of the second cavity is provided with an exhaust port;

The third cavity has built-in rotor blades, and a long fiber pulp outlet pipe is arranged at the bottom of the third cavity;

The bottom of the fourth cavity communicates with the short fiber pulp outlet pipe;

The lower part of the fifth cavity is connected to the medium and long fiber pulp outlet pipe;

The bottom of the third cavity and the fifth cavity is a second transverse partition.

The blades on the rotor are arranged in double rows on the rotating disk to form a coaxial blade inner ring and blade outer ring.

The upper cover is in the shape of a spherical arc, and there is an exhaust port in the center of the upper cover, and the exhaust port is used to remove the gas and foam in the sieve body.

The beneficial effects of the utility model are: the defects of poor classification effect, fuzzy classification ratio and high power consumption of the pulp classification equipment are improved, and the multi-stage separation of fibers is more reasonable according to the different requirements of paper products with increasingly diverse varieties. , to meet different needs and reduce production costs. The advantages are concentrated in:

1) Obtain cleaner long-fiber, medium-long-fiber, and short-fiber pulp with adjustable grading ratio and good grading effect.

2) It is convenient to reasonably configure the fibers in waste paper, improve the structure of paper products, and save costs.

3) Double screen design, compact structure, small footprint and few supporting facilities.

4) The classification and impurity separation of long fiber, medium long fiber and short fiber can be completed in the same equipment, with high efficiency and low energy consumption.

Description of drawings

Fig. 1 is the structural representation of the utility model;

In the figure: 1 tank body, 11 tank cover, 12 exhaust port, 2 driving device, 3 main shaft, 41 rotating disk, 42 blade, 51 first round filter screen, 52 second round filter screen, 61 first empty Cavity, 62 second cavity, 63 third cavity, 64 fourth cavity, 65 fifth cavity, 71 first transverse partition, 72 second transverse partition, 73 overflow plate, 74 lower retaining ring, 81 pulp inlet, 82 heavy residue pipe, 83 long fiber pulp outlet pipe, 84 short fiber pulp outlet pipe, 85 medium and long fiber pulp outlet pipe.

Detailed ways

As shown in Figure 1, this kind of waste paper pulp multi-stage fiber screening machine includes a vertical tank body 1, a drive device 2 driven by a motor is installed at the bottom of the tank body 1, a vertical main shaft 3 is installed in the tank body, and the lower end of the main shaft is Controlled by the driving device, the upper end of the main shaft is used to install the rotor, which consists of a rotating disk 41 and blades 42 fixed on the rotating disk, and the rotor is placed inside the tank. The tank body is provided with a slurry inlet and a slurry outlet.

The upper end of the tank body 1 is open, and a tank cover 11 is installed at the opening. The upper cover is spherically arc-shaped, and the center has an exhaust port 12 located at the center of the upper cover. The exhaust port is used to get rid of gas and foam in the sieve body.

The main shaft 3 is vertically installed inside the tank body, and the first round filter screen 51 and the second round filter screen 52 arranged coaxially with the main shaft divide the inner space of the tank body into three parts, forming three cavities inside, inside and outside.

The outer cavity is divided into the upper first cavity 61 and the lower fifth cavity 65 by a transverse partition, the middle cavity is the third cavity 63, and the inner cavity is divided into the upper second cavity by the rotor 62 and the fourth cavity 64 in the lower part.

The first cavity 61 is an annular upper open cavity formed by the overflow plate 73, the first transverse partition 71 and the tank body 1. The overflow plate 73 is the natural extension upwards of the first round filter screen 51, Moreover, a slurry inlet 81 and a heavy residue pipe 82 are provided on the first cavity 61, the slurry inlet 81 is used for feeding, and the heavy residue pipe 82 is used for removing metals in the coarse slurry.

The second cavity 62 is an upper open cavity formed by the overflow plate 73 and the rotating disk 41 on the rotor. There are through holes on the rotating disk. The flow direction of the pulp fluid is from top to bottom. The second cavity It is a flow channel for the pulp fluid, and the tank cover at the top of the second cavity is provided with an exhaust port.

The third cavity 63 is an annular upper open cavity formed by the first round filter screen 51, the second round filter screen 52, the rotating disk 41 and the second transverse partition 72, and the blades 42 of the rotor are placed In the gap between the first round filter screen 51 and the second round filter screen 52, a round hole is set on the second transverse partition plate 72, and extends out of the tank body through a pipe, forming a connection with the third cavity. long fiber slurry outlet pipe 83.

The fourth cavity 64 is a barrel-shaped upper open cavity formed by the second round filter screen 52, the lower retaining ring 74 and the bottom plate of the tank body 1, and the lower retaining ring 74 is the second round filter screen downwards. The free extension of the fourth cavity communicates with the short fiber pulp outlet pipe 84 at the bottom.

The fifth cavity 65 is an annular sealed cavity formed by the first transverse partition 71, the first circular filter screen 51, the second transverse partition 72 and the tank body 1. The lower part of the fifth cavity communicates with the middle The long fiber pulp outlet pipe 85, after filtering the pulp through the first round filter, the paper pulp is discharged from the medium and long fiber pulp outlet pipe.

The blades on the rotor are arranged in double rows on the rotating disk to form a coaxial blade inner ring array and blade outer ring array. The inner blade ring acts on the second circular filter screen, and the outer blade ring acts on the first circular filter screen.

The utility model is equipment for classification treatment of long and short fiber sieves after rough screening in a screening system, and can be used in a pulping screening system. The screening machine is a continuous running vertical fully enclosed pressure screen. The slurry enters the first cavity from the upper part of the screening machine along the tangential direction with a certain pressure. The heavy slag in the first cavity is crushed by gravity and centrifugal force. The heavy slag pipe collects and discharges intermittently to prevent it from entering the third cavity and prolong the service life of the screen drum and rotor. Slurry overflows from the overflow plate into the gap between the two screen drums. Under the action of the centrifugal force and centripetal force generated when the rotor rotates, the positive pulse generated at the front end destroys the fiber network on the surface of the screen drum and allows the fibers to pass through. The generated suction pulse draws the filtrate back from the good pulp side and cleans the sieve plate. The medium-long fiber pulp and short-fiber pulp flow to the fifth cavity and the fourth cavity respectively through screen drums with different slit widths. The short fiber pulp outlet pipe 84 and the medium and long fiber pulp outlet pipe 85 flow out, while the long fiber pulp flows downward, and finally flows out from the long fiber pulp outlet pipe 83 . When the slurry leaves the tail of the blade, the negative pressure disappears immediately, and the medium and long fibers and short fibers start a new separation relying on the circulation of the rotor. The screening machine can adjust the classification ratio of long, medium and short fibers according to the control of the pulp outlet and tailing outlet, and it can also be used as an ordinary pressure screen.

Except for the technical features described in the instructions, all are known technologies by those skilled in the art.

Claims (3)

1. multistage fibre fractionation machine of old paper stock comprises tank body, drive unit, circle filter screen, main shaft and is installed in rotor on the main shaft, and described tank body is provided with stock inlet and grout outlet, it is characterized in that:

Described tank body upper end open, described opening part is installed a cover;

Described rotor is made of rotating disc and the blade that is fixed on the rotating disc;

Described main shaft is vertically installed, with the first circle filter screen and the second circle filter screen of the coaxial setting of main shaft the tank interior space is divided into three parts, three cavitys in China and foreign countries in forming, described external cavity is divided into first cavity on top and the 5th cavity of bottom by a lateral partitions, described cavity is the 3rd cavity, and described internal cavity is divided into second cavity on top and the 4th cavity of bottom by rotor;

Described first cavity is provided with stock inlet, heavy slag pipe;

The cover at the described second cavity top is provided with exhaust outlet;

The blade of the built-in rotor of described the 3rd cavity, and the long fiber grout outlet is set in the bottom of the 3rd cavity;

Described the 4th cavity bottom is communicated with the staple fibre grout outlet;

Described the 5th cavity bottom connects the medium-length fibre grout outlet;

Described the 3rd cavity and the 5th cavity bottom are second lateral partitions.

2. the multistage fibre fractionation machine of old paper stock according to claim 1 is characterized in that described epitrochanterian blade is provided with double on rotating disc, form coaxial blade inner ring and blade outer ring.

3. the multistage fibre fractionation machine of old paper stock according to claim 1 is characterized in that described loam cake is the sphere arc, and the described exhaust outlet in center is positioned at the centre of loam cake.

Images