CN204530301U - A kind of paper grade (stock) classifying screen - Google Patents

Abstract

The utility model belongs to the field of papermaking machinery and provides a grading screen for papermaking. The grading sieve includes a feeding part and a screening part, wherein the screening part mainly includes a bracket, and an inclined base is arranged in the bracket. Bottom sieve, middle sieve and top sieve are arranged on the seat from bottom to top, wherein sieve plates are arranged at the bottom of the middle sieve and the top sieve, and the sieve plate of the middle sieve has a smaller aperture than the sieve plate of the top sieve , the base is hoisted on the bracket through lugs and steel cables, and the drive shaft is connected to the bottom of the base through the lugs. With this structure of grading screen, the crushed raw materials can be classified and screened out, and the qualified The raw material is screened from the middle screen, while the under-broken raw material is screened from the top screen, and the over-broken raw material is screened from the bottom screen.

Description

Classifying screen for papermaking

Technical field:

The utility model belongs to the field of papermaking machinery, in particular to a grading screen for papermaking.

Background technique:

Modern papermaking procedures can be divided into main steps such as pulping, modulation, papermaking, and processing, among which pulping is the first step in papermaking. The existing pulping raw materials and plants that are used as pulping raw materials can be divided into four categories: stem fiber Classes, bast fibers, seed wool fibers and wood fibers, in addition to waste paper can also be used as raw materials for pulping. Among them, there are many wood fibers, but at present, China's wood resources are far from meeting the needs of the growing pulp and paper industry, and using wood as a raw material for papermaking will bring great pressure to the environment, and the pollution is relatively serious. There are a lot of waste water and waste residues, and it is extremely difficult to deal with them. Straw pulp, as a new type of paper pulping raw material developed recently, is gradually replacing wood pulp as the primary pulping raw material. Its length is different, and the content of impurities is high. How to apply it reasonably to the paper industry has been a difficult problem in recent years. Because the length of the fiber is required when making paper into pulp, it is necessary to crush straw and other raw materials. The pulping operation can only be carried out after the crushed straw, and the length and thickness of the straw after crushing will be different, so it must be classified and screened, and the qualified raw materials will be sent to the subsequent process. In the prior art, grading screens are generally used to complete This work, but the existing grading screen is actually an inclined multi-layer screen, relying on the gravity of the raw material itself to pass through the screen with different apertures during the progress. Although this method is simple, due to the broken state of the raw material itself Not one, it is easy to overlap, so that it cannot be screened out, which will bring a lot of pressure to the subsequent steps.

Contents of the invention

Aiming at the above-mentioned problems existing in the existing raw material grading sieve, the utility model provides a brand-new grading sieve, which includes a feeding part and a screening part, wherein the sieving part mainly includes a bracket, and an inclined screen is arranged in the bracket. The base is provided with a bottom screen, a middle screen and a top screen from bottom to top, wherein the middle screen and the bottom of the top screen are provided with a sieve plate, and the sieve plate aperture of the middle screen is smaller than that of the top screen. The hole diameter of the sieve plate, the base is hoisted on the bracket through the lug plate and the steel cable, and the drive shaft is connected to the bottom of the base through the lug plate. With this structure of the grading screen, the crushed raw materials can be Grading and screening, the qualified raw materials are screened out from the middle screen, while the under-broken raw materials are screened out from the top screen, and the over-broken raw materials are screened out from the bottom screen. The forward and backward movement can also realize the vertical movement of the screen to achieve better screening effect.

The utility model adopts the following technical solutions: a grading sieve for papermaking, the grading sieve includes a feeding part and a screening part, wherein the feeding part includes a feeder, a feeder arranged below the feeder, the The above-mentioned feeder is provided with a feeder screw, and the lower part of the feeder is open and directly connected to the discharge port;

The screening part mainly includes a bracket, and an inclined base is arranged in the bracket, and a bottom screen, a middle screen and a top screen are arranged on the base from bottom to top, wherein the middle screen and the top screen The bottom is provided with a sieve plate, and the sieve plate aperture of the middle screen is smaller than that of the top sieve plate, and the bottom sieve plate is a non-porous steel plate; the base is hoisted on the bracket by ear plates and steel cables , the lugs are uniformly welded on both sides of the base; at least one drive shaft is connected to the bottom of the base through the lug I, and the other end of the drive shaft is connected to the turntable, and the turntable and the drive motor connect;

The feeder is a feeding conveyor belt or a device with equivalent functions. When feeding, the crushed straw and other raw materials can be sent into the feeder through the feeder. The feeding screw arranged in the feeder is composed of two Sections of opposing spirals, the feeder is facing the joint of the opposing spirals, after adopting this structure, after the raw material enters the distributor, it is forced to move in two directions driven by the opposing spirals, avoiding In the prior art, the co-rotating screw will further squeeze the raw material, which makes it difficult to distribute evenly. At the same time, the raw material that is overlapped during crushing can be directly separated by the counter-rotating screw. Furthermore, the lower opening of the distributor is directly connected to the discharge material. This structure enables the raw materials to be more evenly dispersed on the screen, improving the screening effect of raw materials on the screen;

The raw materials falling from the discharge port directly fall into the top screen. Since the base is installed in the bracket at an angle, the raw materials can slide down under the action of their own gravity. The larger size raw materials will stay in the top screen and continue to slide down, while the raw materials falling into the middle screen will repeat the movement process in the top screen, and the qualified raw materials will stay in the top screen. In the middle screen, the over-broken raw materials will fall into the bottom screen. Since the bottom plate of the bottom screen is a non-porous steel plate, this part of the over-broken raw material will stay in the bottom screen and finally pass through the bottom screen. It can be used comprehensively as fuel mixed with sludge, as raw material for fiber boards, as raw material for organic fertilizer, etc. Therefore, it will not cause the loss of this part of raw materials, and will not cause corresponding pollution of dust or fine particles; in order to achieve the above purpose, the utility model has limited the sieve plate aperture of the middle screen to be smaller than the aperture of the top screen, and the sieve plate aperture of the middle screen just meets the requirements of raw materials;

The above-mentioned raw material movement is the movement under the action of its own gravity, which is also a conventional movement method, and another difference between the utility model and the prior art is that the utility model is connected with at least one driving device at the bottom of the base through the ear plate. shaft, the other end of the drive shaft is connected to the turntable, and the turntable is connected to the drive motor; more preferably, the drive shaft is connected to the turntable eccentrically. After this method, with the rotation of the turntable , the drive shaft will pull the base to move back and forth, and at the same time push the base to move in the vertical direction. The shaft is driven to vibrate up and down. The purpose of this is not only to provide horizontal power for the movement of raw materials, but also to make the materials better dispersed during the up and down jolting process, and to disperse the overlapped raw materials. Better and more evenly distributed on the sieve, thus greatly improving the screening effect, compared with the prior art in which materials are simply rolled and screened, there is a significant improvement. In order to cooperate with this structure, the utility model will The base of the base is hoisted on the bracket through lug plates and steel cables, and the lug plates are evenly welded on both sides of the base; in this way, when the base is shaken under the drive of the drive shaft, the slack of the steel cables and the Tighten to provide the stroke of the base's up and down movement, and the inclination angle of the entire base can be adjusted by adjusting the length of the steel cables at different positions;

In order to avoid damage caused by excessive friction with the bracket when the base moves back and forth, there are rollers on both sides of the base where they are in contact with the front end of the bracket. The rollers are set between the bottom screen and the bracket pole. Generally, the diameter of the control roller is slightly larger than the width of the base between the bottom screen and the support pole, so that the direct friction between the base and the support can be avoided, and the service life of the base and the support is greatly improved. It also makes it easier to disassemble and overhaul the entire base and bracket;

In order to separate raw materials of different specifications conveniently, the bottom screen, the middle screen and the top screen are all equipped with separate discharge ports, and the discharge direction of each discharge port is different, which is convenient for arranging different conveying devices. Among them, the outlet of the middle screen is directly connected to the feeding conveyor belt, and the raw materials of qualified size are directly sent to the next step equipment, while the outlet of the top screen is directly connected to the feeding conveyor belt of the crusher, and the raw materials of larger size are sent to the next step equipment. Back to the crusher for crushing, while the outlet of the bottom screen is directly connected to the waste conveyor belt, and the unqualified raw materials and screened impurities are discharged for further processing.

Since the base in the utility model can also move in the vertical direction, reinforcing ribs are provided on the outside of the bottom screen, the middle screen and the top screen to connect the three parts together, and in order to better observe the middle screen In the case of qualified raw materials in the net, only observation holes are set on the side of the middle screen. In order to improve the structural strength of the screen, reinforcing ribs can also be set in the screen above the screen holes to increase its transverse strength;

The turntable and the drive motor are horizontally arranged at the bottom of the bracket, and the two are connected by a belt; in order to achieve better results, each drive shaft can be connected to its own turntable, and then synchronously connected to the drive motor ;

To sum up, the grading sieve with this structure can classify and sieve the crushed raw materials, sieve the qualified raw materials from the middle sieve, and sieve the insufficiently broken raw materials from the top sieve. Over-broken raw materials are screened out from the bottom screen. The grading screen can not only realize the front and rear movement of the screen, but also realize the vertical movement of the screen to achieve better screening effect.

Description of drawings

Fig. 1 is the structural representation of classifying sieve described in the utility model;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a partially enlarged view of part A in Fig. 2;

In the figure, 1 is the discharge port, 2 is the distributor, 3 is the feeder, 4 is the steel cable, 5 is the ear plate, 6 is the bracket, 7 is the driving motor, 8 is the turntable, 9 is the drive shaft, 10 is the Roller, 11 is the outlet of the bottom screen, 12 is the outlet of the middle screen, 13 is the outlet of the top screen, 14 is the reinforcing rib, 15 is the bottom screen, 16 is the middle screen, 17 is the top screen Net, 18 pedestals, 19 is a material distribution screw, 20 is a sieve hole, and 21 is an ear plate I.

Detailed ways

A grading screen for papermaking, the grading sieve includes a feeding part and a screening part, wherein the feeding part includes a feeder 3, a feeder 2 arranged below the feeder 3, and the feeder 2 2 is provided with a distributing screw 19, and the lower part of the distributing device 2 is open and directly connected to the discharge port 1;

Wherein said screening part mainly comprises support 6, is provided with inclined base 18 in support 6, is provided with bottom screen cloth 15, middle part screen cloth 16 and top screen cloth 17 on base 18 from bottom to top, wherein The bottom of the middle screen 16 and the top screen 17 are all provided with a sieve plate 20, and the aperture of the middle screen 16 sieve plate is smaller than the aperture of the top screen 17 sieve, and the bottom screen 15 bottom plate is a non-porous steel plate; The base 18 is hoisted on the bracket 6 through the ear plate 5 and the steel cable 4, and the ear plate 5 is uniformly welded on both sides of the base; at least one drive shaft 9 is connected to the bottom of the base through the ear plate I21, The other end of the drive shaft 9 is connected to the turntable 8, and the turntable 8 is connected to the drive motor 7;

Described feeder 3 is the device of feeding conveyer belt or equivalent function;

The distributing screw 19 provided in the distributor 2 is composed of two sections of opposite spirals;

The feeder 3 is facing the junction of the opposite spirals;

The aperture of the sieve plate of the middle screen 16 just meets the requirements of the raw material;

On the position that base 18 both sides contacts with support 6 front ends, all be provided with roller 10, this roller is arranged between bottom screen cloth 15 and support 6 upright bars, can slide between the two, the diameter of general control roller 10 is slightly greater than the width of the base 18 between the bottom screen and the support pole;

The bottom screen 15, the middle screen 16 and the top screen 17 are all provided with reinforcing ribs 14 on the outside to fix the three parts together, and in order to better observe the situation of qualified raw materials in the middle screen, only the middle screen The 16 sides are provided with observation holes, in order to improve the structural strength of the screen, reinforcing ribs 20 can also be set in the screen above the screen holes to improve its transverse strength;

The turntable 8 and the drive motor 7 are all horizontally arranged at the bottom of the support 6, and the two are connected by a belt; in order to achieve a better effect, each drive shaft can be connected to a respective turntable, and then synchronously connected to the on the drive motor;

The bottom screen 15 is provided with a separate discharge port 11, the middle screen 16 is provided with a separate discharge port 12 and the top screen 17 is provided with a separate discharge port 13, and the discharge direction of each discharge port is different. .

Claims (6)

1. A grading screen for papermaking, comprising a feeding part and a screening part, is characterized in that: Described feed part comprises feeder (3), is arranged on feeder (3) below feeder (2), and described feeder (2) is provided with feed screw (19), The lower part of the distributor (2) is open and directly connected to the discharge port (1); Wherein said screening part mainly comprises support (6), is provided with inclined base (18) in support (6), is provided with bottom screen (15), middle part on base (18) from bottom to top. Sieve cloth (16) and top screen cloth (17), wherein middle part screen cloth (16) and top screen cloth (17) bottom are all provided with sieve plate (20), and middle part screen cloth (16) sieve plate hole diameter is smaller than top sieve cloth The aperture of the screen (17) sieve plate, the bottom screen (15) bottom plate is a non-porous steel plate; the base (18) is hoisted on the support (6) Above, the lugs (5) are uniformly welded on both sides of the base; at least one drive shaft (9) is connected to the bottom of the base through the lug I (21), and the drive shaft (9) is another One end is connected on the turntable (8), and the turntable (8) is connected with the drive motor (7); Rollers (10) are all arranged on the position where both sides of the base (18) contact with the front end of the support (6), and the rollers are arranged between the bottom screen (15) and the vertical rod of the support (6); the rollers (10 ) diameter is greater than the width of the base (18) between the bottom screen cloth and the support pole. 2. The classifying sieve according to claim 1, characterized in that: The distributing screw (19) provided in the distributor (2) is composed of two sections of opposing spirals; the feeder (3) is facing the junction of the opposing spirals. 3. The grading sieve according to claim 1, characterized in that: the aperture diameter of the sieve plate of the middle sieve (16) is the same as the requirement of the raw material size. 4. The grading screen according to claim 1, characterized in that: the bottom screen (15), the middle screen (16) and the top screen (17) outside are all provided with reinforcing ribs (14), in the middle Sieve cloth (16) side is provided with observation hole. 5. The grading screen according to claim 1, characterized in that: the turntable (8) and the drive motor (7) are horizontally arranged at the bottom of the bracket (6), and the two are connected by a belt. 6. The grading screen according to claim 1, characterized in that: the bottom screen (15) is provided with a separate discharge port (11), and the middle screen (16) is provided with a separate discharge port (12) ) and top screen cloth (17) are provided with independent discharge port (13), and the discharge direction of each discharge port is different.