Multi-stage differential double-roller flour mill

Abstract

The invention discloses a multistage differential double-roller flour mill, and relates to the technical field of flour mills, the multistage differential double-roller flour mill comprises a flour milling box, the upper part of the flour milling box is rotatably provided with two groups of symmetrical upper milling rollers, the lower part of the flour milling box is rotatably provided with two groups of symmetrical lower milling rollers, and the middle part of the flour milling box is fixedly connected with a partition plate; a discharging groove is formed in the middle of the partition plate, and two sets of symmetrical quantifying mechanisms are installed on the discharging groove. The quantifying mechanism comprises a bearing guide plate capable of sliding up and down in the grinding box, a first pushing block fixedly connected to the bottom side of the bearing guide plate and a second pushing block fixedly connected to the surface of the partition plate. According to the quantitative mechanism, discharging can be automatically controlled according to the actual stacking weight of the materials, it is ensured that the amount of the materials entering the lower grinding roller is stable, the problems of blockage caused by too many materials and insufficient grinding caused by too few materials are solved, and the grinding efficiency of equipment and the product quality are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flour mill, in particular to a multi-stage differential roller mill. BACKGROUND

[0002] In many industrial fields such as grain processing, ore grinding, and chemical raw material refining, flour mills are indispensable key equipment. Among them, multi-stage differential roller mills are widely used in production scenarios that require material to be refined to a specific particle size, thanks to their characteristics of step-by-step grinding by multiple sets of rollers and enhanced grinding effect by using the speed difference between the rollers. The basic working principle of this type of equipment is that the motor drives the relative rotation of multiple sets of upper and lower grinding rollers, and uses the extrusion force and shear force between the grinding rollers to grind the material. After the material enters from the feed inlet, it is first subjected to preliminary grinding by the upper grinding rollers, and then further refined by the lower grinding rollers, finally obtaining the required powder material.

[0003] In the existing multi-stage differential roller mill, the amount of material falling from the gap of the upper grinding roller cannot be effectively controlled. When the material feed amount is unstable or the grinding efficiency of the upper grinding roller fluctuates, the amount of material falling into the lower grinding roller will be more or less. If the amount of material is too much, it is easy to accumulate at the inlet of the lower grinding roller, causing blockage, affecting the normal operation of the equipment, and even requiring shutdown for cleaning, reducing production efficiency. If the amount of material is too small, the lower grinding roller cannot fully play its grinding role, which will lead to insufficient grinding and affect the quality of the final product, while also causing waste of energy, and the gap between the grinding rollers and the material conveying channel are prone to blockage due to material aggregation and adhesion. SUMMARY

[0004] The purpose of the present application is to provide a multi-stage differential roller mill to solve the problems existing in the background art.

[0005] The purpose of the present application can be achieved by the following technical solutions: A multi-stage differential roller mill, comprising a flour mill box, two sets of symmetrical upper grinding rollers are rotatably assembled on the upper part of the flour mill box, two sets of symmetrical lower grinding rollers are rotatably assembled on the lower part of the flour mill box, and a partition plate is fixedly connected to the middle part of the flour mill box. A discharge slot is formed in the middle part of the partition plate, and two sets of symmetrical quantitative mechanisms are installed on the partition plate. The quantitative mechanism comprises a load guide plate that can slide up and down in the flour mill box, a push block one fixedly connected to the bottom side of the load guide plate, and a push block two fixedly connected to the surface of the partition plate. When the load guide plate receives the powder falling from the gap of the upper grinding roller and is pushed downward by gravity, the push block one and the push block two are in contact and displaced, thereby exposing the discharge slot and realizing the quantitative opening and closing of the load guide plate.

[0006] As a further scheme of the present application, the quantitative mechanism further comprises a limiting column fixedly connected in a sliding groove formed in the inner side of the partition plate, and a sliding block slidingly connected to the surface of the limiting column; A contraction spring II is fixedly connected between the sliding block and the partition plate, and is sleeved on the surface of the limiting column; A positioning block is fixedly connected to the surface of the sliding block, and a moving rod is slidingly connected in the positioning block, and one end of the moving rod is fixedly connected to the bottom of the bearing guide plate; A contraction spring I is fixedly connected between the positioning block and the bearing guide plate.

[0007] As a further scheme of the present application, the front end of the bearing guide plate is beveled to facilitate the guiding of the powder, and the rear end is flat. The sliding block is slidingly connected in the sliding groove formed in the partition plate, and the moving stroke thereof is less than the width radius of the discharge chute.

[0008] As a further scheme of the present application, the positioning block is fixedly connected with a connecting column on one side, the connecting column is slidingly arranged on one side of the grinding box, and a pull rod is fixedly connected to the other end of the connecting column and located outside the grinding box.

[0009] As a further scheme of the present application, the upper grinding rollers are fixedly connected with gears meshing with each other on one side, and the lower grinding rollers are also fixedly connected with gears meshing with each other on one side. One side of the upper grinding rollers is fixedly connected with a large transmission wheel, the large transmission wheel is drivingly connected with a small transmission wheel through a transmission belt, and the small transmission wheel is fixedly connected to one side of the upper and lower adjacent lower grinding rollers.

[0010] As a further scheme of the present application, the grinding box is fixedly connected with side protection plates on both sides, a motor is fixedly connected to the side protection plate on one side, and the output end of the motor is fixedly connected to one side of the upper grinding roller of the other group and rotatably arranged in the middle part of the side protection plate.

[0011] As a further scheme of the present application, two groups of symmetrical material dredging mechanisms are arranged between the two groups of upper grinding rollers and between the two groups of lower grinding rollers, for dredging the material between the corresponding grinding rollers.

[0012] As a further scheme of the present application, the material dredging mechanism comprises a rotating shaft rotatably connected to the middle part of the grinding box; A dredging guide plate is fixedly connected to the surface of the rotating shaft; two connecting shafts are movably arranged on both sides of the rotating shaft; The two groups of material dredging mechanisms are connected through two groups of symmetrically arranged double-hook springs, and the two sides of the double-hook springs are respectively hung on one side of two adjacent connecting shafts.

[0013] As a further scheme of the present application: the top of the grinding box is fixedly connected with a top plate, the surface of the top plate is fixedly connected with two symmetrically arranged fixed blocks, and the top surfaces of the two fixed blocks are jointly fixedly connected with a feeding hopper. The feeding hopper and the top plate form a feeding groove therebetween, and the feeding hopper and one of the fixed blocks are slidingly connected with a blocking plate.

[0014] As a further scheme of the present application: the bottom inner side of the grinding box is fixedly connected with a pouring hopper for guiding the material, and the periphery of the bottom is fixedly connected with a support.

[0015] The present application has the following beneficial effects: (1) The bearing guide plate in the quantitative mechanism can receive the ground powder falling from the upper grinding roller gap, and when the material accumulates to a certain weight, the bearing guide plate moves downward under the action of gravity, the push block one and the push block two contact and move out of position, the discharge slot is exposed, and the material is quantitatively dropped into the lower grinding roller. This structure can automatically control the discharge according to the actual accumulation weight of the material, ensure the stable amount of material entering the lower grinding roller, avoid the problems of blockage caused by too much material and insufficient grinding caused by too little material, and improve the grinding efficiency and product quality of the equipment. (2) In the material dredging mechanism, the dredging guide plate is tightly attached to the inner side of the grinding roller under the action of the double-hook spring, and can comb the material and remove the adhesion on the roller surface when the grinding roller rotates; when blockage occurs, the accumulated material pushes the dredging guide plate to increase the swing amplitude against the spring force, and strongly agitates the blocked area. At the same time, the inner arc surface of the dredging guide plate can guide the material to the bearing guide plate, forming a closed loop cooperation of grinding, dredging and conveying, and reducing the downtime due to blockage. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further described below with reference to the accompanying drawings.

[0017] Figure 1 is a perspective structural schematic diagram of the present application; Figure 2 is a cross-sectional structural schematic diagram of the present application Figure One ; Figure 3 is a cross-sectional structural schematic diagram of the present application Figure Two ; Figure 4 is a combination schematic diagram of the upper grinding roller and the lower grinding roller in the present application Figure One ; Figure 5 is a combination schematic diagram of the upper grinding roller and the lower grinding roller in the present application Figure Two ; Figure 6 is a perspective structural schematic diagram of the quantitative mechanism in the present application; Figure 7 is a cross-sectional structural schematic diagram of the quantitative mechanism in the present application; Figure 8 is Figure 7 is an enlarged view of A in the figure; Figure 9 is a schematic view of a local structure of the present application; Figure 10 is a schematic view of a three-dimensional structure of the material dredging mechanism in the present application; Figure 11 is a schematic view of a local structure section of the present application.

[0018] In the figure: 1, a flour mill box; 2, upper grinding rollers; 3, lower grinding rollers; 4, a material dredging mechanism; 40, dredging guide vanes; 41, rotating shafts; 42, connecting shafts; 5, large transmission wheels; 6, small transmission wheels; 7, transmission belts; 8, partition plates; 9, quantitative mechanisms; 90, load guide plates; 91, connecting columns; 92, push block one; 93, push block two; 94, moving rods; 95, positioning blocks; 96, contraction springs one; 97, sliding blocks; 98, limiting columns; 99, contraction springs two; 10, discharge slots; 11, motors; 12, side protection plates; 13, feed hoppers; 14, supports; 15, inverted hoppers; 16, fixed blocks; 17, top plates; 18, blocking plates; 19, feed slots; 20, gears; 21, pull rods; 22, double-hook springs. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0020] Embodiment one Please refer to Figures 1-11 the present application is a multi-stage differential pair roller flour mill, which comprises a flour mill box 1, two groups of symmetrical upper grinding rollers 2 are rotatably assembled on the upper part of the flour mill box 1, two groups of symmetrical lower grinding rollers 3 are rotatably assembled on the lower part of the flour mill box 1, and a partition plate 8 is fixedly connected to the middle part of the flour mill box 1. A discharge slot 10 is formed in the middle part of the partition plate 8, and two groups of symmetrical quantitative mechanisms 9 are installed on the partition plate 8. The quantitative mechanism 9 comprises a load guide plate 90 which can slide up and down in the flour mill box 1, a push block one 92 which is fixedly connected to the bottom side of the load guide plate 90, and a push block two 93 which is fixedly connected to the surface of the partition plate 8. When the load guide plate 90 receives the flour falling from the gap of the upper grinding roller 2 and is pushed downward by gravity, the push block one 92 and the push block two 93 are in contact and move away from each other, thereby exposing the discharge slot 10 and realizing the quantitative opening and closing of the load guide plate 90.

[0021] It should be noted that the push block one 92 and the push block two 93 are both arranged in a right triangle and symmetrically, and the inclined surfaces of the push block one 92 and the push block two 93 are matched with each other. The push block one 92 and the push block two 93 are both provided with two groups of synchronous pushing structures for the two sides of the bearing guide plate 90.

[0022] Preferably, the quantitative mechanism 9 further comprises: a limiting column 98 fixedly connected in a sliding groove formed in the inner side of the partition plate 8, and a sliding block 97 slidingly connected to the surface of the limiting column 98; A contraction spring two 99 is fixedly connected between the sliding block 97 and the partition plate 8, and is sleeved on the surface of the limiting column 98; A positioning block 95 is fixedly connected to the surface of the sliding block 97, and a moving rod 94 is slidingly connected in the positioning block 95, and one end of the moving rod 94 is fixedly connected to the bottom of the bearing guide plate 90; A contraction spring one 96 is fixedly connected between the positioning block 95 and the bearing guide plate 90.

[0023] It should be noted that the moving rod 94, the positioning block 95, the contraction spring one 96, the sliding block 97, the limiting column 98 and the contraction spring two 99 are all provided with four groups of structures respectively located around the bottom of the plane end of the bearing guide plate 90. The contraction spring one 96 can be replaced according to the total weight of the actual material to adjust the appropriate quantity.

[0024] Preferably, the front end of the bearing guide plate 90 is arranged in an inclined surface to facilitate the guiding of the powder grinding, and the rear end is arranged in a plane. The sliding block 97 is slidingly connected in the sliding groove formed in the partition plate 8, and the moving stroke of the sliding block 97 is less than the width radius of the discharging groove 10, so that the over-opening of the bearing guide plate 90 can be effectively avoided to make the material fall on the surface of the partition plate 8.

[0025] When the two sets of upper grinding rollers 2 crush the ground powder and the powder falls onto the surface of the load guide plate 90 of the two sets of quantitative mechanisms 9, the total weight gradually accumulates, and when the accumulated pressure reaches the pressure borne by the contraction spring one 96, the load guide plate 90 moves downward under the surface material pressure, the load guide plate 90 moves downward along the inside of the positioning block 95 through the four surrounding moving rods 94, and the load guide plate 90 extrudes the contraction spring one 96, the bottom of the load guide plate 90 moves downward with the pushing block one 92, when the pushing block one 92 contacts the pushing block two 93, the pushing block one 92 moves backward under the pushing force of the pushing block two 93, the pushing block one 92 moves backward along with the moving rod 94, the positioning block 95, and the sliding block 97 along the surface of the sliding groove and the limiting column 98 opened on the partition plate 8 and pushes the contraction spring two 99 to contract, and the two sets of load guide plates 90 move backward, so that the two sets of closed load guide plates 90 are opened, and the surface material falls from the discharge chute 10 to the gap between the two sets of lower grinding rollers 3 through the front inclined surface, so that the material can be quantitatively discharged when entering the second stage of grinding, which can effectively avoid that the ground powder is directly discharged from the gap between the two sets of lower grinding rollers 3 due to insufficient accumulation, thereby increasing the effect of the second stage of grinding. When the accumulated material on the surface of the load guide plate 90 is insufficient, the load guide plate 90 moves upward with the pushing block one 92 under the counteracting force of the contraction spring one 96 in the positioning block 95 to restore the original position, and the sliding block 97 moves forward along with the positioning block 95, the moving rod 94, and the load guide plate 90 under the counteracting force of the contraction spring two 99 along the sliding groove of the limiting column 98 and the partition plate 8 to restore the original position. When the grinding is finished, the two pull rods 21 are pulled, and the pull rod 21 moves backward along with the positioning block 95 and the moving rod 94 along the sliding groove of the limiting column 98 and the partition plate 8, so that the two sets of closed load guide plates 90 are opened again, which can effectively avoid that the surface of the load guide plate 90 is insufficient due to insufficient weight and residual material after grinding.

[0026] Embodiment two It shows another embodiment based on the embodiment one of the application, and therefore the repeated parts are not further described.

[0027] In the application, the positioning block 95 is fixedly connected with a connecting column 91 on one side, the connecting column 91 is slidably arranged on one side of the grinding box 1, and the other end is fixedly connected with a pull rod 21 located outside the grinding box 1.

[0028] In the application, one side of the two sets of upper grinding rollers 2 is fixedly connected with mutually meshing gear wheels 20, and one side of the two sets of lower grinding rollers 3 is also fixedly connected with mutually meshing gear wheels 20. One side of one set of upper grinding rollers 2 is fixedly connected with a large transmission wheel 5, the large transmission wheel 5 is drivingly connected with a small transmission wheel 6 through a transmission belt 7, and the small transmission wheel 6 is fixedly connected to one side of one set of upper and lower adjacent lower grinding rollers 3.

[0029] It needs to be explained that the two groups of upper grinding rollers 2 are primary grinding, the two groups of lower grinding rollers 3 are secondary grinding, and the gap between the two groups of lower grinding rollers 3 is smaller than the gap between the two groups of upper grinding rollers 2, so that fine grinding is realized.

[0030] In the application, the grinding box 1 is fixedly connected with side protection plates 12 on both sides, one side of the side protection plate 12 is fixedly connected with a motor 11, the output end of the motor 11 is fixedly connected to one side of the other group of upper grinding rollers 2 and rotates through the middle part of the side protection plate 12.

[0031] In the application, the top of the grinding box 1 is fixedly connected with a top plate 17, the surface of the top plate 17 is fixedly connected with two symmetrically arranged fixed blocks 16, and the top surfaces of the two fixed blocks 16 are fixedly connected with a feeding hopper 13. A feeding groove 19 is formed between the feeding hopper 13 and the top plate 17, and a blocking plate 18 is slidably connected between the feeding hopper 13 and one of the fixed blocks 16.

[0032] In the application, the bottom inside of the grinding box 1 is fixedly connected with an inverted hopper 15 for guiding the material, and the periphery of the bottom is fixedly connected with a support 14.

[0033] In the implementation process, the blocking plate 18 is pushed, the blocking plate 18 is pushed inward along the feeding groove 19 and one of the fixed blocks 16 to adjust the size of the opening and closing of the feeding groove 19 in the feeding hopper 13, the material is poured into the feeding hopper 13 and falls into the middle part of the two groups of upper grinding rollers 2 from the feeding groove 19, the motor 11 is arranged, the output end of the motor 11 rotates with one group of upper grinding rollers 2, one group of upper grinding rollers 2 rotates with the gear 20 and the gear 20 of the other group of upper grinding rollers 2, so that the two groups of upper grinding rollers 2 relatively rotate along the middle part of the grinding box 1, the material is grinded, the ground powder is pulled into the gap and falls to the surface of the two groups of bearing guide plates 90 under the action of the roller friction after the preliminary grinding is completed. When the two groups of bearing guide plates 90 are opened, the preliminarily ground powder falls into the middle part of the two groups of lower grinding rollers 3 through the discharge groove 10, and one group of upper grinding rollers 2 rotates at the same time with the large transmission wheel 5, the large transmission wheel 5 rotates with the transmission belt 7, the transmission belt 7 rotates with the small transmission wheel 6, the small transmission wheel 6 rotates with one group of lower grinding rollers 3, one side of one group of lower grinding rollers 3 is engaged with the gear 20 of the other group of lower grinding rollers 3 through the gear 20, so that the two groups of lower grinding rollers 3 relatively rotate, and because the diameter of the small transmission wheel 6 is smaller than the diameter of the large transmission wheel 5, the rotating speed of the two groups of lower grinding rollers 3 is higher than that of the two groups of upper grinding rollers 2, the two groups of lower grinding rollers 3 relatively rotate to realize the secondary grinding of the material, and the material is pulled into the gap and falls to the inverted hopper 15 under the action of the roller friction, and slides out through the inclined surface of the inverted hopper 15, and because the gap between the two groups of lower grinding rollers 3 is smaller and the grinding is more fine.

[0034] Example three It shows another embodiment of the present application based on embodiment one and embodiment two, so the repeated part is not further described.

[0035] In the present application, preferably, two groups of material dredging mechanisms 4 are arranged between the two groups of upper grinding rollers 2 and between the two groups of lower grinding rollers 3, for dredging the material between the corresponding grinding rollers.

[0036] In the present application, preferably, the material dredging mechanism 4 comprises: a rotating shaft 41 rotatably connected to the middle part of the flour milling box 1; The dredging guide vane 40 is fixedly connected to one surface of the rotating shaft 41; The connecting shaft 42 is provided with two groups, which are movably installed on both sides of the rotating shaft 41; The two groups of material dredging mechanisms 4 are connected through two groups of symmetrically arranged double-hook springs 22, and the two sides of the double-hook spring 22 are respectively hung on one side of the two adjacent connecting shafts 42.

[0037] It should be noted that the other end of the connecting shaft 42 is provided with a connecting hole, which is convenient for butt joint with the hook of the double-hook spring 22.

[0038] During the implementation process, when the device is in normal operation, the dredging guide vane 40 is tightly attached to the inner side of the upper grinding roller 2 or the lower grinding roller 3 under the action of the double-hook spring 22 with a certain pressure, and in the process of rotation of the two groups of upper grinding rollers 2 or lower grinding rollers 3, it plays a role of combing and dispersing the material in the middle part, preventing the material from agglomerating and accumulating, and can scrape off the material on the surface of the upper grinding roller 2 or the lower grinding roller 3; Once the material blocking trend occurs, the accumulated material will generate greater extrusion force on the paddle, overcome the resistance of the double-hook spring 22, and make the dredging guide vane 40 rotate and swing with the upper grinding roller 2 and the lower grinding roller 3, at this time, the swing amplitude of the dredging guide vane 40 increases, and the blocked material area is strongly stirred and dredged to improve the dredging efficiency. And the material flows into the inclined surface end of the bearing guide plate 90 through the inner arc surface of the dredging guide vane 40, which can automatically respond to the material blocking problem in real time, without manual intervention, and greatly reduces the downtime of the equipment caused by blocking.

[0039] The embodiments of the present application are described in detail above, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. A multi-stage differential counter-rotating roller mill characterized in that, Including mill box (1), the upper part of the mill box (1) is rotatably equipped with two groups of symmetrical upper grinding rollers (2), the lower part is rotatably equipped with two groups of symmetrical lower grinding rollers (3), and the middle part is fixedly connected with a partition plate (8); The partition plate (8) is provided with a discharge groove (10) in the middle part, and two groups of symmetrical quantitative mechanisms (9) are mounted on the partition plate (8); The quantitative mechanism (9) comprises a bearing guide plate (90) which is slidably arranged in the mill box (1), a push block one (92) which is fixedly connected to the bottom side of the bearing guide plate (90), and a push block two (93) which is fixedly connected to the surface of the partition plate (8); When the bearing guide plate (90) receives the powder falling from the gap of the upper grinding roller (2) and is pushed downward by gravity, the push block one (92) and the push block two (93) are in contact and dislocated and move backward, so that the discharge groove (10) is exposed, and the quantitative opening and closing of the bearing guide plate (90) is realized.

2. A multi-stage differential counter-roller mill according to claim 1, characterized in that, The quantitative mechanism (9) further comprises a limiting column (98) fixedly connected in a sliding groove formed in the inner side of the partition plate (8), and a sliding block (97) slidably connected to the surface of the limiting column (98); A contraction spring two (99) is fixedly connected between the sliding block (97) and the partition plate (8) and is sleeved on the surface of the limiting column (98); A positioning block (95) is fixedly connected to the surface of the sliding block (97), and a moving rod (94) is slidably connected in the positioning block (95), and one end of the moving rod (94) is fixedly connected to the bottom of the bearing guide plate (90); A contraction spring one (96) is fixedly connected between the positioning block (95) and the bearing guide plate (90).

3. A multi-stage differential counter-rotating roller mill according to claim 2, characterized in that The front end of the bearing guide plate (90) is inclined to facilitate powder grinding, and the rear end is flat. The sliding block (97) is slidably connected in the sliding groove formed in the partition plate (8), and the moving stroke of the sliding block (97) is less than the width radius of the discharge groove (10).

4. A multi-stage differential counter-roller mill according to claim 2, characterised in that, One side of the positioning block (95) is fixedly connected with a connecting column (91), the connecting column (91) is slidably arranged in one side of the mill box (1), and the other end is fixedly connected with a pull rod (21) arranged outside the mill box (1).

5. A multi-stage differential counter-rotating roller mill in accordance with claim 1, wherein, One side of each of the two groups of upper grinding rollers (2) is fixedly connected with a gear (20) which is engaged with each other, and one side of each of the two groups of lower grinding rollers (3) is also fixedly connected with a gear (20) which is engaged with each other. One side of one of the upper grinding rollers (2) is fixedly connected with a large transmission wheel (5), the large transmission wheel (5) is drivingly connected with a small transmission wheel (6) through a transmission belt (7), and the small transmission wheel (6) is fixedly connected to one side of one of the upper and lower adjacent lower grinding rollers (3).

6. A multi-stage differential counter-rotating roller mill in accordance with claim 1, wherein, The mill box (1) is fixedly connected with side protection plates (12) on both sides, and the motor (11) is fixedly connected to one of the side protection plates (12), and the output end of the motor (11) is fixedly connected to one side of the other group of upper grinding rollers (2) and rotatably arranged in the middle part of the side protection plate (12).

7. A multi-stage differential counter-rotating roller mill according to claim 1, wherein Two groups of symmetrical material dredging mechanisms (4) are arranged between the two groups of upper grinding rollers (2) and between the two groups of lower grinding rollers (3) to dredge the materials between the corresponding grinding rollers.

8. A multi-stage differential counter-rotating roller mill according to claim 7, characterized in that The material dredging mechanism (4) comprises a rotating shaft (41) rotatably connected in the middle part of the mill box (1). The dredging guide piece (40) is fixedly connected at one end to the surface of the rotating shaft (41); The connecting shaft (42) is provided with two and is movably installed on both sides of the rotating shaft (41); The two groups of material dredging mechanisms (4) are connected through two groups of symmetrically arranged double-hook springs (22), and the two sides of the double-hook spring (22) are respectively hung on one side of the two adjacent connecting shafts (42).

9. A multi-stage differential counter-rotating roller mill in accordance with claim 1, wherein, The top of the grinding box (1) is fixedly connected with a top plate (17), the surface of the top plate (17) is fixedly connected with two symmetrically arranged fixed blocks (16), and the top surfaces of the two fixed blocks (16) are jointly fixedly connected with a feeding hopper (13). The feeding hopper (13) and the top plate (17) form a feeding groove (19), and the feeding hopper (13) and one of the fixed blocks (16) are slidably connected with a blocking plate (18).

10. A multi-stage differential counter-roller mill according to claim 1, characterized in that, The bottom inside of the grinding box (1) is fixedly connected with a reverse hopper (15) for guiding the material, and the periphery of the bottom is fixedly connected with a support (14).

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