CN218554760U

CN218554760U - Raw materials preliminary treatment's step screening plant

Info

Publication number: CN218554760U
Application number: CN202222022175.5U
Authority: CN
Inventors: 金海�; 颜艺专; 牛强
Original assignee: Ordos Xijin Mining And Metallurgy Co ltd
Current assignee: Ordos Xijin Mining And Metallurgy Co ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2023-03-03
Anticipated expiration: 2032-08-02

Abstract

The utility model provides a step screening plant of raw materials preliminary treatment belongs to the screening crushing technical field of raw materials, mainly includes first shell, installs the feed inlet on the first shell of device, sets up the screening platform that has a plurality of sieve meshes below the feed inlet, sets up the feeding belt below the screening platform, the discharge gate that the feeding belt below set up, the scraper subassembly that is connected with screening platform left side baffle, the adjustable baffle that is connected with screening platform right side to and the cloth belt that sets up on adjustable baffle right side, cloth belt below is provided with the crushing roller, is provided with the extrusion breaker below the crushing roller, and this device screens the raw materials, the crushing function collects in an organic whole step by step, does not need additionally to be equipped with other equipment alright once only to handle the raw materials and become the required target raw materials of production, and is simpler, high-efficient, convenient in the aspect of acquireing of raw materials.

Description

Raw materials preliminary treatment's step screening plant

Technical Field

The utility model belongs to the technical field of the screening of raw materials is broken, especially, relate to a step screening plant of raw materials preliminary treatment.

Background

At present, with the development of scientific technology, fields such as metallurgy and the like are all rapidly developed, metallurgical alloy raw materials are different in size in reality, great difficulty is caused to subsequent processes, the alloy raw materials of the traditional method are processed, most of the raw materials need to be subjected to raw material grade solving by suppliers when the raw materials are purchased, all the raw materials can not meet the grade requirement due to the technical difference of the suppliers in the level of the raw material grade processing, some suppliers can not meet the grade requirement, the problem of material blockage of enterprises in the production process can not be avoided, even if the raw materials of part of suppliers meet the production requirement, part of enterprises can not obtain high-quality and stable raw material supply due to the regional difference. Not only will spend a large amount of time on handling the putty, reduced production efficiency, also can increase artificial potential safety hazard when the putty is handled to the manual work, all caused very big puzzlement to the economic benefits and the production safety of enterprise.

The invention discloses a screening and crushing integrated machine in Chinese patent application CN102896019B, which mainly comprises a feeding port, a screen surface with a screen slot structure, a counterattack roller and a counterattack screen roller for crushing raw materials, a feeding belt conveyor and the like. When the screening and crushing integrated machine is used for screening and crushing, the counterattack rollers and the counterattack screen rollers have limited power and can not thoroughly crush large and hard raw materials into expected sizes, so that the screening and crushing integrated machine can not achieve the purpose of efficiently treating all raw materials at one time.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the above-mentioned prior art, the utility model provides a raw materials preliminary treatment's step screening plant, the to-be-solved technical problem of the utility model is to provide a once only acquire the required target raw materials of production, eliminate the putty hidden danger that the too big bringing of raw materials grain size, can improve production efficiency's step screening plant.

For solving the technical problem, the utility model provides a raw materials preliminary treatment's step screening plant, including first shell, install feed inlet above first shell, set up screening platform that has a plurality of sieve meshes below the feed inlet, set up at the discharge gate that feeding belt, the feeding belt below of screening platform set up, the scraper subassembly that is connected with screening platform left side baffle, set up at the adjustable baffle on screening platform right side and install the cloth belt on adjustable baffle right side, cloth belt below is provided with a plurality of to the roller crusher, to roller crusher level staggered arrangement, be provided with the extrusion breaker in the below of lower floor to the roller crusher, the extrusion breaker with to the roller crusher setting inside the second shell.

Furthermore, the double-roll crusher comprises a frame, a roller and a roller connecting rod, wherein the roller is connected with the roller connecting rod, the frame is connected with the second shell, two ends of the frame are provided with slideways, and two ends of the roller connecting rod are connected with the slideways. The frame is the rectangle, and the frame passes through the pivot and links to each other with the second shell, and the frame can be rotatory round this pivot, makes frame and level personally submit certain contained angle, and the roller is installed on the roller connecting rod, and the roller connecting rod can slide on the slide to adjust the distance between the roller connecting rod, and then prevent that equipment card material.

Furthermore, each double-roller crusher comprises a plurality of rollers, the surfaces of the rollers are provided with conical spikes which can crush raw materials, the rollers can rotate clockwise or anticlockwise around the axis of the roller connecting rod under the driving of a motor, each roller is controlled by a separate motor, and the rollers can rotate in the same direction or in different directions.

Further, the scraper subassembly includes scraper and telescopic bracket, and telescopic bracket's one end and screening platform left side baffle are connected, and telescopic bracket's the other end links to each other with the scraper, and telescopic bracket includes two connecting rods, and two connecting rods are connected through the pivot, and two connecting rods can round under the drive of motor the pivot is rotatory, and two connecting rods are certain contained angle to realize that the scraper cleans from adjustable baffle to between the left side baffle. The connecting shaft is arranged at the joint of the upper part of the scraper and the telescopic support, the scraper can rotate around the connecting shaft under the driving of the motor, and the rotating speed and the rotating direction of the scraper are adjustable. After the raw materials fell to the screening platform through the feed inlet, the scraper began to scatter the raw materials on the screening platform around the connecting axle is rotatory, after the raw materials that the size meets the requirements passed through the sieve mesh on the screening platform, the adjustable baffle in right side of screening platform was fallen, the adjustable baffle overlap joint is in cloth belt top, the scraper stops rotatoryly, telescopic bracket is rotatory around its self pivot, the area scraper removes between left side baffle to adjustable baffle to clear up the raw materials of surplus on the screening platform. The scraper is rectangular and is laterally erected on the screening platform.

Further, adjustable baffle passes through the rotation axis with the screening platform to be connected, can empty 180 degrees around its rotatory axial on the screening platform to the outside of screening platform, and the scraper subassembly can carry the cloth belt through adjustable baffle with the raw materials of surplus on the screening platform on, adjustable baffle can be for the middle low U type baffle that both ends are high, and the both ends that U type baffle is high can link up with second shell 1 to prevent that the raw materials from spilling from adjustable baffle both sides at the in-process of carrying.

Further, the cloth belt includes feed end and discharge end, the feed end is located the outside of second shell, and the discharge end setting of cloth belt is inside the second shell, is equipped with the opening that supplies the cloth belt to pass through on the second shell, the open-ended lower part is equipped with the pivot, and the cloth belt can rotate around this pivot to drive the discharge end swing back and forth on cloth belt right side, make the raw materials arrange uniformly on the roller crusher, can prevent like this that the cloth is too much on the fixed position to the roller crusher, influence crushing effect. The cloth belt runs clockwise, the belt is divided into an upper layer and a lower layer, the upper layer and the lower layer of the belt are driven by the motor to rotate, and raw materials on the cloth belt are conveyed to the discharge end.

Furthermore, the feeding belt is a group of conveying mechanisms crossing the screening platform and below the double-roller crusher and the extrusion crusher.

Furthermore, the number of the feeding belts is two, one group is a conveying mechanism crossing the lower part of the screening platform, and the other group is a conveying mechanism crossing the lower parts of the double-roll crusher and the extrusion crusher. The discharge gate sets up on the first shell of feeding belt's one end. The raw materials processed by the screening platform, the double-roller crusher and the extrusion crusher share a group of feeding belts, and then the processed raw materials are conveyed by the feeding belts to enter the discharge hole. The driving motor of a group of feeding belts is saved, and the effects of saving energy and reducing cost are achieved.

Furthermore, a conical blanking port is arranged below the extrusion crusher and connected with the second shell.

Because the utility model discloses set up the double-roll crusher in pay-off belt below, multistage double-roll crusher can carry out crushing treatment to the raw materials, the surface of roller is equipped with the toper spine, can be broken with the raw materials, the roller incorgruous rotation plays the effect of broken raw materials, and when meetting the unusual raw materials that are difficult to the double-roll crusher, the frame rotates around its pivot with first shell junction, thereby make and personally submit certain contained angle to the double-roll crusher and level, under the assistance of action of gravity, and adjust the rotation direction of roller for the syntropy rotation, make and be difficult to broken raw materials and carry downwards, fall into the extrusion breaker and smash, the raw materials after smashing falls on the pay-off belt through the toper blanking mouth that is located the extrusion breaker below. And the roller connecting rod can slide on the slide, adjust the distance between the roller connecting rod, can effectively prevent equipment card material to solved because the big grain level raw materials that leak out in the crushing process cause the putty problem to low reaches technology link, provide dual guarantee for low reaches technology link production, this equipment can wide application in metallurgy and building field.

Drawings

Figure 1 is a schematic view of a first embodiment of the raw material pretreatment step screening device of the present invention.

Figure 2 is a schematic view of a second embodiment of the raw material pre-treatment step screening device of the present invention.

Figure 3 is a side view of the scraper assembly of a raw material pre-treatment step screening device of the present invention.

Figure 4 is a top view of the scraper assembly of the raw material pre-treatment step screening device of the present invention.

Figure 5 is the scraper subassembly shrink state schematic diagram of raw materials preliminary treatment's step screening plant of the utility model.

FIG. 6 is a top view of the double-roll crusher of the raw material pretreatment step screening device of the present invention.

Figure 7 is a cloth belt schematic diagram of the raw material pretreatment step screening device of the present invention.

The device comprises a material inlet 1, a material inlet 2, an adjustable baffle 3, a scraper component 4, a screening platform 5, a material distribution belt 6, a double-roll crusher 7, an extrusion crusher 8, a material conveying belt 9, a material outlet 10, a first shell 11, a roller 12, a second shell 13, a telescopic support 14, a scraper 15, a frame 16, a roller connecting rod 17 and a slideway.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In order to better understand the purpose, structure and function of the present invention, the following description will be made in detail with reference to the accompanying drawings.

Example (b):

fig. 1 shows the first embodiment of the utility model, this embodiment provides a raw materials preliminary treatment's step screening plant, including first shell 10, install feed inlet 1 on first shell 10 of device, the setting has porous structure's screening platform 4 below feed inlet 1, the feeding belt 8 of setting in screening platform 4 below, the discharge gate 9 that sets up below feeding belt 8, the scraper subassembly 3 that is connected with screening platform 4 left side baffle, the adjustable baffle 2 that is connected with screening platform 4 right side, second shell 12 that sets up in adjustable baffle 2 right side, the discharge end is located the inside cloth belt 5 of second shell 12, the pair roller crusher 6 that sets up below cloth belt 5, and the extrusion crusher 7 that sets up below pair roller crusher 6.

Screening platform 4 is connected with first shell 10 through the welding mode, and on screening platform 4, set up a plurality of sieve meshes that can make the raw materials that the size meets the requirements pass through, the screening platform is circular, and the sieve mesh can be arbitrary shape, like circular, oval, square, rectangle, rhombus etc..

Scraper subassembly 3 that is connected with 4 left side baffles of screening platform, as shown in fig. 3 and 4, scraper subassembly 3 includes scraper 14 and telescopic bracket 13, and telescopic bracket 13's one end is connected with 4 left side baffles of screening platform, and telescopic bracket 13's the other end links to each other with scraper 14's upper portion, and telescopic bracket 13's middle part is provided with the pivot, and telescopic bracket includes two connecting rods, and two connecting rods pass through the pivot is connected, as shown in fig. 5, two connecting rods can round under the drive of motor the pivot is rotatory, and two connecting rods become certain contained angle to realize scraper 14 from adjustable baffle 2 to cleaning between the left side baffle. A connecting shaft is arranged at the joint of the upper part of the scraper 14 and the telescopic bracket 13, the scraper 14 can rotate around the connecting shaft under the driving of a motor, and the rotating speed and the rotating direction of the scraper 14 are adjustable. After the raw materials fell to screening platform 4 through feed inlet 1, scraper 14 began to scatter the raw materials on screening platform 4 around the connecting axle is rotatory, the raw materials that the size meets the requirements after passing through the sieve mesh on screening platform 4, screening platform 4's right side adjustable baffle 2 is fallen, adjustable baffle 2 overlap joint is in cloth belt 5 top, scraper subassembly 3 stops rotatoryly, telescopic bracket 13 is rotatory around its self pivot, take scraper 14 to remove between left baffle and adjustable baffle 2, thereby clear up the raw materials of surplus on screening platform 4. The scraper 14 is rectangular and stands on its side on the screening deck.

Adjustable baffle 2 that is connected with 4 right sides of screening platform can empty 180 degrees around its outside of fixing the rotatory axial screening platform 4 on screening platform 4, and scraper subassembly 3 can carry the cloth belt 5 with surplus raw materials on screening platform 4 through adjustable baffle 2 on, adjustable baffle 2 is the high U type baffle in middle low both ends, and the both ends that U type baffle is high can link up with second shell 12 to prevent that the raw materials from spilling from 2 both sides of adjustable baffle in the in-process of carrying.

The feed end of cloth belt 5 is located the outside of second shell 12, as shown in fig. 7, and the discharge end setting of cloth belt 5 is inside second shell 12, is equipped with the opening that supplies cloth belt 5 to pass through on the second shell 12, the open-ended lower part is equipped with the pivot, and cloth belt 5 can rotate around this pivot to drive the discharge end swing back and forth on cloth belt 5 right side, make the raw materials arrange uniformly on roller crusher 6, can prevent like this that the cloth is too much on the fixed position to roller crusher 6, influence crushing effect. The cloth belt 5 runs clockwise, the belt is divided into an upper layer and a lower layer, the upper layer and the lower layer of the belt are driven by the motor to rotate, and raw materials on the cloth belt 5 are conveyed to the discharge end.

At 5 below welded double roll crushers 6 of cloth belt, this raw materials preliminary treatment's step screening plant is including a plurality of double roll crushers 6, a plurality of double roll crushers 6 level staggered arrangement, keep certain interval installation between the double roll crushers 6, the one end of double roll crushers 6 is fixed on second shell 12 through the pivot, the other end of double roll crushers 6 is the free end, double roll crushers 6 are around this pivot clockwise or anticlockwise rotation, make the free end to double roll crushers 6 reciprocate, thereby double roll crushers 6 and horizontal plane produce the contained angle, the raw materials can be along the downward transport of the double roll crushers 6 of slope.

As shown in fig. 6, the double-roll crusher 6 comprises a frame 15, a roller 11 and a roller connecting rod 16, wherein the frame 15 of the double-roll crusher 6 is rectangular, the frame 15 is connected with the second housing 12 through a rotating shaft, the frame 15 can rotate around the rotating shaft, so that the frame 15 and a horizontal plane form a certain included angle, the roller 11 is installed on the roller connecting rod 16, two slide ways 17 are arranged at two ends of the frame 15, two ends of the roller connecting rod 16 are connected with the slide ways 17, and the roller connecting rod 16 can slide on the slide ways 17, so as to adjust the distance between the roller connecting rods 16, and further prevent the equipment from being blocked. The surface of the roller 11 is provided with a conical spine, so that raw materials can be crushed, the roller 11 can rotate clockwise or anticlockwise around the axis of the roller connecting rod 16 under the drive of the motor, the roller connecting rod 16 can drive the roller 11 to slide on the slideway 17 under the drive of the motor, so that the distance among the rollers 11 is adjusted, the material blocking condition of equipment is avoided, each roller 11 is controlled by an independent motor, and the rollers 11 can rotate in the same direction or in different directions. When the adjacent rollers 11 rotate in different directions, the raw materials distributed on the double-roller crusher 6 by the distribution belt 5 can be crushed; if there is the raw materials that are difficult to break on the roll crusher 6, frame 15 rotates around its pivot with second shell 12 to make roll crusher 6 personally submit certain contained angle with the level, and adjust the rotation direction of roller 11 for the syntropy rotation, make difficult to broken raw materials to carry downwards, fall into extrusion crusher 7 and smash, the raw materials after smashing falls on feeding belt 8 through the toper blanking mouth that is located extrusion crusher 7 below.

As shown in fig. 1, the feeding belts 8 are installed at the bottom of the first housing 10 by welding, the number of the feeding belts 8 is two, one is a conveying mechanism crossing below the screening platform 4, the group conveys the raw material screened by the screening platform 4 into the discharge port 9, the other is a conveying mechanism crossing below the double-roll crusher 6 and the crushing crusher 7, and the group conveys the raw material crushed by the double-roll crusher 6 and the crushing crusher 7 into the discharge port 9. The discharge port 9 is arranged between the two groups of feeding belts 8, and the discharge port 9 is connected with the first shell 10.

The working process of the raw material pretreatment step screening device is as follows: here, the description will be given by taking an example in which the size of the circular holes of the screening deck 4 is 180mm, the thickness of the screening deck is 15mm, and the crushing mill 7 can process a material having a particle size of 300mm at maximum, and the material is an iron alloy. Ferroalloy production raw materials are poured onto a screening platform 4 through a feeding hole 1, a scraper component 3 connected with a baffle on the left side of the screening platform 4 starts to rotate and move to disperse the ferroalloy raw materials, most of the raw materials smaller than 180mm enter a conical blanking hole positioned below the screening platform 4 through a sieve hole of the screening platform 4, finally, the iron alloy falls on the feeding belt 8 below through the conical blanking port, the driving motor of the feeding belt 8 drives the feeding belt 8 to move, the iron alloy raw material with the thickness not more than 180mm is fed into the discharging port 9, then the adjustable baffle 2 connected to the right side of the screening platform 4 falls down, the adjustable baffle 2 is connected with the cloth belt 5 on the right side after falling down, the scraper component 3 sends the ferroalloy raw material which is larger than 180mm and is left on the screening platform 4 to the cloth belt 5 through the adjustable baffle 2, the feeding end of the cloth belt 5 is positioned outside the second shell 12, the discharging end of the cloth belt 5 moves to start to carry out cloth on the double-roll crusher 6, the upper roller 11 of the double-roller crusher 6 starts to rotate in different directions to crush the raw materials, the crushed raw materials fall onto the feeding belt 8 below the double-roller crusher 6 through a cone positioned below the double-roller crusher 6, the feeding belt 8 feeds the raw materials into the discharge hole 9, if raw materials which are difficult to crush are left on the pair roller crusher 6, the motor drives the rotating shaft of the pair roller crusher 6 fixed on the second housing 12, thereby adjusting the included angle between the double-roller crusher 6 and the horizontal plane, adjusting the rotation direction of the rollers to rotate in the same direction through the motor, thereby conveying the raw materials which are difficult to crush downwards, leading the raw materials to finally fall into the extrusion crusher 7 for crushing, leading the crushed raw materials to fall onto the feeding belt 8, the crushed raw materials are fed into a discharge hole 9 through a feeding belt 8, so that the raw materials meeting the requirement of the size fraction are obtained.

Fig. 2 shows a second embodiment of the present invention, which is different from the raw material pre-processing step screening device shown in fig. 1 in that the feeding belt 8 is a set of conveying mechanism stretching across the screening platform 4 and below the double-roll crusher 6 and the extrusion crusher 7, and the discharge port 9 is arranged on the first housing 10 at one end of the feeding belt 8. The raw materials processed by the screening platform 4, the roller crusher 6 and the extrusion crusher 7 share a set of feeding belts 8, and then the feeding belts 8 convey the processed raw materials into a discharge port 9.

The raw material pretreatment cascade screening device can achieve all the effects of the first embodiment: screening raw materials, broken function collection in an organic whole step by step, need not additionally be equipped with other equipment alright become the required target raw materials of production with raw materials disposable processing, contain a plurality of rollers 11 to roller crusher 6 and can carry out crushing treatment to the raw materials, and can adjust the contained angle to roller crusher 6 and horizontal plane, adjust 11 direction of rotation of roller simultaneously, the gravity effect that produces through the rotation of roller and the contained angle to roller crusher 6 and horizontal plane will be detained and carry to extrusion crusher 7 at the large granule raw materials to roller crusher 6 on, in addition each roller 11's interval can be adjusted, the appearance of equipment card material phenomenon has been avoided, simultaneously can also save a set of feeding belt's driving motor, play energy saving and reduce cost's effect.

Because the utility model discloses set up roller crusher 6 in feeding belt below, multistage roller crusher can carry out crushing treatment to the raw materials, and when meetting to the roller crusher be difficult to broken unusual raw materials, utilize the characteristics that can adjust inclination and interval to roller crusher 6, adjust each to roller crusher inclination, interval and roller direction of rotation, under the assistance of action of gravity, will handle to roller crusher 6 last surplus uncrushed raw materials delivery to extrusion crusher, solved because the large grain level raw materials that leak out in the crushing process cause the putty problem to low reaches technology link, produce and provide dual guarantee for low reaches technology link, this equipment can wide application in metallurgy and building field.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims

1. The utility model provides a raw materials preliminary treatment's step screening plant, includes first shell (10), installs feed inlet (1) above first shell (10), sets up screening platform (4) that have a plurality of sieve meshes below feed inlet (1), sets up feeding belt (8) in screening platform (4) below, discharge gate (9) that feeding belt (8) below set up, scraper subassembly (3) that are connected with screening platform (4) left side baffle, set up adjustable baffle (2) on screening platform (4) right side and install cloth belt (5) on adjustable baffle (2) right side, its characterized in that, cloth belt (5) below is provided with a plurality of to roller crusher (6), to roller crusher (6) level staggered arrangement, be provided with extrusion breaker (7) in the below of lower floor to roller crusher (6), extrusion breaker (7) and to roller crusher (6) set up inside second shell (12).

2. The raw material pre-treatment stepped screening device according to claim 1, wherein the pair of roller crushers (6) includes a frame (15), a roller (11) and a roller connecting rod (16), the roller (11) is connected with the roller connecting rod (16), the frame (15) is connected with the second housing (12), both ends of the frame (15) are provided with slideways (17), and both ends of the roller connecting rod (16) are connected with the slideways (17).

3. A raw material pre-treatment stepped screening device according to any one of claims 1 or 2, characterized in that each double roll crusher (6) comprises a plurality of rolls (11), the surface of the rolls (11) being provided with conical spikes.

4. The raw material pretreatment stepped screening device according to any one of claims 1 or 2, wherein the scraper assembly (3) comprises a scraper (13) and a telescopic bracket (14), one end of the telescopic bracket (14) is connected with a baffle on the left side of the screening platform (4), the other end of the telescopic bracket (14) is connected with the scraper (13), and a connecting shaft is arranged at the joint of the telescopic bracket (14) and the scraper (13).

5. A raw material pre-treatment stepped screening device as claimed in claim 4, characterised in that the adjustable baffles (2) are connected with the screening deck (4) by a rotating shaft.

6. The raw material pre-treatment stepped screening device according to claim 5, characterized in that the distribution belt (5) comprises a feed end and a discharge end, the feed end is located outside the second housing (12), the discharge end of the distribution belt (5) is arranged inside the second housing (12), and the second housing (12) is provided with an opening for the distribution belt (5) to pass through.

7. The raw material pre-treatment step screen device according to claim 6, characterized in that a rotating shaft is arranged below the opening of the second outer shell (12).

8. A raw material pre-treatment stepped screening device according to any one of claims 1 or 2, characterized in that the feeding belt (8) is a set of conveying mechanisms spanning under the screening deck (4) and the pair roller crusher (6), the crushing crusher (7).

9. A raw material pre-treatment stepped screening device according to any one of claims 1 or 2, characterized in that the number of said feed belts (8) is two groups, one group being a conveyor mechanism crossing under the screening deck (4) and the other group being a conveyor mechanism crossing under the double roll crusher (6) and the crushing crusher (7).

10. A raw material pre-treatment stepped screening device according to any one of claims 1 or 2, characterized in that a conical blanking port is provided below the crushing crusher (7), and the conical blanking port is connected to the second housing (12).