Double-roller double-ring die pelletizer based on scraper-type balanced feed pre-compression system

Abstract

A roller double-ring die pelletizer based on a scraper-type balanced feed pre-compression system is characterized in that it includes a pelletizer body, a silo, a first roller ring die, a second roller ring die, and a scraper-type balanced feed pre-compression device. The scraper-type balanced feed pre-compression device is composed of a pressure roller, a scraper or a scraper plate, and a corresponding adjustment mechanism. When working, the scraper-type balanced feed pre-compression system is constructed through the relative movement and mutual action between the scraper-type balanced feed pre-compression device and the roller double-ring die, so as to realize the balanced feed and pre-compression control of the roller double-ring die pelletizer. The present invention has the characteristics of simple structure, reliability, and high efficiency, can solve the working stability problem of the roller ring die pelletizer, and provide relevant technology and equipment for biomass pellet molding, especially for straw and fiber biomass pellet molding.

Description

Technical Field

[0001] The invention relates to the technical field of biomass compression and densification molding, in particular to a horizontal double-roller double-ring mold granulator, specifically a double-roller double-ring mold granulator based on a scraper-type balanced feeding pre-compression system. Background Art

[0002] As people's attention to resource scarcity and environmental pollution continues to increase, how to effectively utilize crop straw has become one of the current research focuses in my country. The emergence of biomass compaction technology provides a good way to efficiently reuse straw resources.

[0003] Straw compacting equipment has various structural forms according to different forming methods. In recent years, both domestic and foreign countries have begun to develop a double-roller double-ring die pelletizer, such as the German KRONE field mobile pelletizer, which is suitable for the integrated operation of picking up, crushing and pelletizing straw in the field. However, no matter what kind of extrusion compacting technology and equipment, according to its working process and principle, balanced and effective feeding to the extrusion zone is one of the important factors affecting the adaptability, working stability, production efficiency, unit energy consumption, and wear of key working parts of the extrusion compacting equipment. A scientific and reasonable balanced feed pre-compression system is also the key to ensure the stable operation of straw fiber biomass pelleting equipment.

[0004] The field mobile pellet forming machine of KRONE in Germany adopts the vertical arrangement of the two-ring die axis in the roller double-ring die, and the balanced feeding pre-compression system adopts the structure of flat belt conveyor. Since it is a field operation, the collection and feeding amount of straw are relatively balanced, so the balanced feeding problem of the pellet machine is naturally solved. Domestic patents such as CN 109513399 A, "Feeding mechanism of pellet machine and pellet machine", CN109433105A "Pellet machine", CN110252199A "Pellet machine roller and pellet machine" and other patents, on the basis of learning from foreign technology, adopt the vertical double-ring die arrangement structure of Germany, or change the roller double-ring die to the horizontal (horizontal) arrangement of two axes, but the balanced feeding pre-compression system still adopts the flat belt conveyor and the original pre-compression structure, and the roller double-ring die pellet machine is used for fixed operation, as a result, the balanced feeding pre-compression system cannot work effectively. Figure 2 This is a structural diagram of the "Pellet Machine Feeding Mechanism and Pellet Machine" (CN 109513399A) which is a German technology and imitated by my country.

[0005] The patents CN205288324U "A Double-ring Die Roller Granulator" and CN205288326U "A Double-ring Die Extrusion Device for Granulator" are a kind of fixed double-ring die roller granulator technology jointly developed by domestic enterprises and foreign countries. The technical route adopted by its "balanced feeding and pre-compression system" is: 1. "Balanced feeding system": using a double screw feeder to divide the material from the distribution bin into two ways to feed the two roller ring dies separately (claims 1 and 4); 2. "Pre-compression system": using "one side of each of the two ring dies is corresponding to a pressure roller", which respectively constitutes two groups of "pre-compression systems". As far as its "balanced feeding and pre-compression system" is concerned, there are problems such as too complicated structure, high manufacturing cost and inability to realize pre-compression of materials in the compression zone. Figures 3-4 It is the "screw feeding system" and "material equalization system" in the double-ring die roller granulator.

[0006] CN 112221430 A 《Double-roller double-ring die granulator balanced feed pre-compression granulator》 provides a balanced feed pre-compression system for a double-roller double-ring die granulator (see attached Figure 5 ), although there have been some breakthroughs in solving the technology of balanced feeding and pre-compression control of the double-roller double-ring die pellet mill, there are still problems such as complex structure, low silo utilization, affected feeding, and the effect and stability of balanced feeding and pre-compression still need to be improved.

[0007] Depend on Figure 1 It can be seen that if the conventional double-roller double-ring die pellet machine does not have a balanced feeding, material distribution and pre-compression system, it is very easy to cause excessive material intake, especially for fiber materials such as straw, which directly affects the working stability of the equipment and even causes equipment jamming or component damage.

[0008] Depend on Figure 5 It can be seen that the double-roller double-ring die granulator with balanced feeding and pre-compression provided by CN 112221430 A mainly utilizes a device composed of "feed pressure regulating roller 3, material dispensing roller 4, material baffle plate 5 and transmission system and other components", and further provides and constructs a "balanced feeding, material equalization and pre-compression system" for the double-roller double-ring die granulator. However, the system has the problems of complex structure, low utilization rate of silo, affected feeding, and the effect and stability of balanced feeding and pre-compression still need to be improved.

[0009] The balanced feed pre-compression system is an important part of the double-roller double-ring die pellet mill. Therefore, it is urgent to provide a balanced feed pre-compression system with a simple structure, stable operation and high efficiency for the double-roller double-ring die pellet mill to solve the working stability problem of the double-roller ring die pellet mill. Summary of the invention

[0010] The present invention aims at the problems existing in the existing granule forming equipment, such as complex structure, low utilization rate of silos, affected feeding, and the effect and stability of balanced feeding and pre-compression still need to be improved, and provides a double-roller double-ring die granulator based on a scraper-type balanced feeding pre-compression system. In the technology and system of balanced feeding, material distribution and pre-compression, a "scraper-type balanced feeding pre-compression device" is adopted. Through the relative movement and mutual action between the scraper-type balanced feeding pre-compression device and the double-roller double-ring die, a scraper-type balanced feeding and pre-compression system with simple structure, stable operation and high efficiency is constructed, so as to realize the control of balanced feeding and pre-compression of the double-roller double-ring die granulator and solve the problem of working stability of the double-roller ring die granulator.

[0011] The technical solution of the present invention is:

[0012] A double roller ring die granulator based on a scraper-type balanced feeding pre-compression system, characterized in that: the double roller ring die granulator adopts an upper feeding method, and comprises a granulator body 01, a silo 02, a first pair of roller ring dies 1, a second pair of roller ring dies 2 and a scraper-type balanced feeding pre-compression device 30, wherein the scraper-type balanced feeding pre-compression device 30 is composed of a pressure roller 302 and scrapers or scrapers 301 on both sides. When working, the material enters the granulator silo 02 from the upper part of the granulator, and the material is transported to the middle pre-compression zone 6 under the joint drive of the first pair of roller ring dies 1 and the second pair of roller ring dies 2 in relative motion, and the scraper or The scraper 301 and the corresponding first pair of roller ring dies 1 and second pair of roller ring dies 2 form a "balanced feeding system" of the roller double-ring die granulator. The pressure roller 302 in the scraper-type balanced feeding pre-compression device 30 and the first pair of roller ring dies 1 and second pair of roller ring dies 2 form a "pre-compression system" of the roller double-ring die granulator. Further, through the relative movement and mutual action between the first pair of roller ring dies 1, the second pair of roller ring dies 2 and the scraper-type balanced feeding pre-compression device 30, a "scraper-type balanced feeding pre-compression system" is constructed to achieve the control of balanced feeding, material distribution and pre-compression of the roller double-ring die granulator.

[0013] The silo 02 is arranged at the upper part of the machine body 01, and the three axes of the first pair of roller ring mold 1, the second pair of roller ring mold 2 and the scraper-type balanced feeding pre-compression device 30 are supported in parallel in the machine body 01. The axes of the first pair of roller ring mold 1 and the second pair of roller ring mold 2 are arranged horizontally, and the scraper-type balanced feeding pre-compression device 30 is located above the symmetry center of the first pair of roller ring mold 1 and the second pair of roller ring mold 2, and can be adjusted and fixed in the vertical direction.

[0014] The scraper-type balanced feed pre-compression device 30 is composed of a pressure roller 302, a scraper or scraper plate 301, a scraper adjustment assembly screw 303, an assembly shaft 304, and a circumferential positioning adjustment slider 305. The pressure roller 302 is fixed in the silo 02 through the assembly shaft 304, the height of the assembly shaft 304 is adjustable, and the circumferential positioning adjustment slider 305 is inserted in the corresponding mounting groove in the silo 02 to prevent the pressure roller 302 from circumferential rotation; the scraper or scraper plate 301 is fixed to the pressure roller 302 by screws 303, and the vertical installation and fixing height is adjustable to adjust the distance between the horizontal cutting edge of the scraper or scraper plate 301 and the corresponding first pair of roller ring molds 1 and second pair of roller ring molds 2.

[0015] The cross section of the pressing roller 302 is a convex structure, and the lower part of the convex structure is a semi-cylindrical structure.

[0016] A pre-compression zone 6 is formed between the cylindrical surface of the lower half of the pressure roller 302 in the scraper-type balanced feed pre-compression device 30 and the outer cylindrical surfaces of the first pair of roller ring dies 1 and the second pair of roller ring dies 2. Further, through the relative movement and mutual action between the first pair of roller ring dies 1, the second pair of roller ring dies 2 and the scraper-type balanced feed pre-compression device 30, a "pre-compression system" of the roller double-ring die granulator is formed.

[0017] The pressure roller 302 of the scraper-type balanced feed pre-compression device 30 can be adjusted and fixed up and down or left and right along the body 01 vertically or horizontally by adjusting and fixing the fixing device; and the scraper-type balanced feed pre-compression device 30 can be adjusted and fixed up and down or left and right along the vertical or horizontal direction to control the radial gap between the cylindrical surface of the lower half of the pressure roller 302 in the scraper-type balanced feed pre-compression device 30 and the first pair of roller ring mold 1 and the second pair of roller ring mold 2, so as to achieve the control of the pre-compression amount and pre-compression effect of the double-roller double-ring mold granulator.

[0018] By utilizing the two scrapers or scraper plates 301 in the scraper-type balanced feeding pre-compression device 30, and further through the relative movement and mutual action between the first pair of roller ring molds 1 and the second pair of roller ring molds 2 and the two scrapers or plates 301, a "balanced feeding system" of the roller double ring mold pelletizer is constructed.

[0019] The scraper or scraper plate 301 in the scraper-type balanced feed pre-compression device 30 can be adjusted and fixed in the up-down position or the horizontal position relative to the balanced feed pre-compression roller 302; by adjusting and fixing the position of the scraper or scraper plate 301, the radial gap between the blade edge of the scraper or scraper plate 301 and the corresponding first pair of roller ring dies 1 and second pair of roller ring dies 2 is controlled to achieve the balanced feed amount of the double-roller double-ring die pelletizer, and while ensuring balanced feed, the material is evenly distributed along the axial direction of the ring die, achieving the effect of balanced feed and material leveling.

[0020] The front angles of the cutting edges of the two scrapers or scrapers 301 in the scraper-type balanced feeding pre-compression device 30 are positive or negative to meet the granulation requirements of different materials.

[0021] The scraper-type balanced feeding pre-compression device 30 and system, or the scraper-type balanced feeding device therein, can be used as a balanced feeding system for various grinders and crushers.

[0022] The beneficial effects of the present invention are:

[0023] 1. The balanced feed pre-compression system is an indispensable and important part of the roller double-ring die pelletizer. The scraper-type balanced feed pre-compression device provided by the present invention, and the "scraper-type balanced feed pre-compression system and pelletizer" constructed based on it, have the characteristics of simple structure and applicability, which can ensure the stable and efficient operation of the roller ring die pelletizer, and provide relevant technology and equipment for biomass pellet molding, especially for straw and fiber biomass pellet molding.

[0024] 2. The technology of setting the "balanced feeding system" inside the double-roller double-ring mold pellet mill can eliminate the key technical problem that a balanced feeding system must be additionally configured in the pellet production system in order to solve the production stability problem of the double-roller pellet mill in German technology and various imitation roller pellet mills in my country. Therefore, the technology of the present invention can effectively simplify and reduce the technical requirements and production manufacturing costs of the pellet production system, and facilitate use and operation in production.

[0025] 3. The scraper-type balanced feed pre-compression system and granulator have the characteristics of simple structure, convenient adjustment and reliable operation, and can effectively improve the stability and production efficiency of the granulator.

[0026] 4. The scraper-type balanced feeding pre-compression device and system provided by the present invention, or the scraper-type balanced feeding device therein, can also be used as a balanced feeding system for various grinders and crushers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of a conventional double-roller double-ring die feeding system.

[0028] Figure 2 The invention is a schematic diagram of the feeding mechanism of an existing vertical double-roll pellet mill and the structure of the pellet mill.

[0029] Figure 3 It is a schematic diagram of the screw feeding system of the existing horizontal pellet mill.

[0030] Figure 4 It is a schematic diagram of the cross-sectional structure of a material-leveling system of an existing pellet machine.

[0031] Figure 5It is a schematic diagram of the principle of a double-roller double-ring die granulating balanced feeding pre-compression granulator which is closest to the present invention (CN 112221430 A).

[0032] Figure 6 It is a schematic diagram of the working principle of the scraper type balanced feeding pre-compression system and the roller double-ring mold granulator of the present invention.

[0033] Figure 7 It is a structural schematic diagram of the scraper type balanced feed pre-compression system of the present invention.

[0034] Figure 8 It is a schematic diagram of the three-dimensional assembly structure of the scraper-type balanced feeding pre-compression device of the present invention.

[0035] In the figure: 01-machine body; 02-material bin; 1-first pair of roller ring die; 2-second pair of roller ring die; 30-scraper type balanced feed pre-compression device; 301-scraper or scraper; 302-pressing roller; 303-screw; 304-assembly shaft; 305-slider; 6-pre-compression area. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] like Figure 6-8 shown.

[0038] A double roller ring die granulator based on a scraper type balanced feeding pre-compression system, the double roller ring die granulator adopts a top feeding method, and comprises a granulator body 01, a silo 02, a first double roller ring die 1, a second double roller ring die 2, and a scraper type balanced feeding pre-compression device 30, such as Figure 7 As shown, the scraper type balanced feeding pre-compression device 30 is composed of a pressure roller 302, a scraper or scraper plate 301 and corresponding assembly and adjustment mechanisms. When working, the material enters the pelletizer bin 02 from the upper part of the pelletizer, and the material is driven by the first pair of roller ring dies 1 and the second pair of roller ring dies 2 in relative motion (rotation) to be transported to the middle pre-compression zone 6. The scraper or scraper plate 301 in the scraper type balanced feeding pre-compression device 30 and the first pair of roller ring dies 1 and the second pair of roller ring dies 2 form a pair of roller double ring die pelletizer. The "balanced feeding system" of the machine, the pressure roller 302 in the scraper-type balanced feeding pre-compression device 30 and the first pair of roller ring dies 1 and the second pair of roller ring dies 2 constitute the "pre-compression system" of the roller double-ring die granulator, and further through the relative movement and mutual action between the first pair of roller ring dies 1, the second pair of roller ring dies 2 and the scraper-type balanced feeding pre-compression device 30, a "scraper-type balanced feeding pre-compression system" is constructed to achieve the balanced feeding, material distribution and pre-compression control of the roller double-ring die granulator. Figure 7As shown, the silo 02 is arranged at the upper part of the machine body 01, and the three axes of the first pair of roller ring molds 1, the second pair of roller ring molds 2 and the scraper-type balanced feed pre-compression device 30 are supported in parallel in the machine body 01. The axes of the first pair of roller ring molds 1 and the second pair of roller ring molds 2 are arranged horizontally, and the scraper-type balanced feed pre-compression device 30 is located above the symmetry center of the first pair of roller ring molds 1 and the second pair of roller ring molds 2, and can be adjusted and fixed in the vertical direction. The scraper-type balanced feed pre-compression device 30 is composed of a pressure roller 302, a scraper or scraper plate 301, a scraper adjustment assembly screw 303, an assembly shaft 304, a circumferential positioning adjustment slider 305, and a vertical adjustment and fixing device (not marked) of the scraper-type balanced feed pre-compression device 30. The cross-section of the pressure roller 302 is a convex structure, and the lower part of the convex structure is a semi-cylindrical structure, such as Figure 8 The pressure roller 302 is fixed in the silo 02 by means of an assembly shaft 304, the height and left and right position of the assembly shaft 304 are adjustable, and the circumferential positioning adjustment slider 305 is inserted into the corresponding mounting groove (not shown in the figure) in the silo 02 to prevent the pressure roller 302 from rotating in the circumferential direction; the scraper or scraper 301 is fixed to the side of the pressure roller 302 by means of screws 303, and the horizontal part can also be fixed to the horizontal plane by means of screws and gaskets (see Figure 8 The screw hole in the middle horizontal plane, the gasket is installed between the horizontal plane of the pressure roller 302 and the scraper or scraper 301), and the installation fixing height in the vertical and horizontal directions is adjustable to adjust the distance between the horizontal edge of the scraper or scraper 301 and the corresponding first pair of roller ring molds 1 and second pair of roller ring molds 2. The shape of the scraper or scraper 301 can be designed into an L-shaped structure. The edge can be angled downward or downward.

[0039] The working process and mechanism of the present invention are:

[0040] When the equipment is working, when the loose biomass material enters the upper silo 02 in the body 01 through the upper feed port of the roller double ring die pelletizer, the first roller ring die 1 and the second roller ring die 2 rotate together to drive the material in the silo to be transported to the pre-compression zone 6, and then the roller double ring dies 1 and 2 compress and complete the pelletization.

[0041] (1) Since the first pair of roller ring dies 1 and the second pair of roller ring dies 2 rotate at the same speed and relative to each other, the "scraper-type balanced feeding pre-compression device" 30 located above the symmetric center of the first pair of roller ring dies 1 and the second pair of roller ring dies 2 can be adjusted and fixed in the vertical direction, and the scraper-type balanced feeding pre-compression device 30 can be prevented from rotating around its assembly axis by adjusting the slider 305. Therefore, through the relative movement and mutual action between the first pair of roller ring dies 1 and the second pair of roller ring dies 2 and the two scrapers or scrapers 301, a "balanced feeding system" of the roller double-ring die pelletizer is constructed;

[0042] By adjusting the position of the "scraper-type balanced feeding pre-compression device" 30 relative to the symmetric center line of the first pair of roller ring dies 1 and the second pair of roller ring dies 2 in the vertical direction, and adjusting and fixing the position of the scraper or scraper 301 in the scraper-type balanced feeding pre-compression device 30, the radial gap between the "cutting edge" of the scraper or scraper 301 and the first pair of roller ring dies 1 and the second pair of roller ring dies 2 is controlled, and the first pair of roller ring dies 1 and the second pair of roller ring dies 2 are rotated to jointly drive the excess material transported to the pre-compression zone 6 to be pushed out, so as to control the balanced feeding amount of the double-roller ring die pelletizer, so as to achieve the purpose of balanced feeding;

[0043] The two scrapers or scrapers 301 in the "scraper-type balanced feeding pre-compression device 30" not only control the balanced feeding of the materials in the silo driven by the rotation of the first pair of roller ring dies 1 and the second pair of roller ring dies 2 to transport the materials to the pre-compression zone 6, but also evenly spread the materials on the first pair of roller ring dies 1 and the second pair of roller ring dies 2 and entering the pre-compression zone 6 along the axial direction, thereby achieving the function of uniform material distribution, which is beneficial to improving the working stability and production efficiency of the roller double-ring die pelletizer;

[0044] (2) Since the cylindrical surface of the lower half of the pressure roller 302 in the "scraper-type balanced feed pre-compression device 30" and the outer cylindrical surfaces of the first pair of roller ring dies 1 and the second pair of roller ring dies 2 form a pre-compression zone 6, further through the relative movement and mutual action between the first pair of roller ring dies 1, the second pair of roller ring dies 2 and the scraper-type balanced feed pre-compression device 30, a pre-compression system of the roller double-ring die pelletizer is formed, which realizes feeding and the first pre-compression of loose materials, and can improve the production efficiency of the equipment;

[0045] The scraper-type balanced feed pre-compression device 30 is adjusted and fixed up and down in the vertical direction of the machine body 01 by means of a vertical adjustment and fixing device (not shown) to control the radial clearance between the cylindrical surface of the lower half of the pressure roller 302 in the scraper-type balanced feed pre-compression device 30 and the first pair of roller ring dies 1 and the second pair of roller ring dies 2, so as to further control the pre-compression amount and pre-compression effect in the pre-compression zone 6 of the double-roller double-ring die granulator.

[0046] From the analysis of the above specific implementation methods, it can be seen that the main features of the present invention are:

[0047] (1) The technology of setting the "balanced feeding system" inside the double-roller double-ring die pellet mill can eliminate the key technical problem that a balanced feeding system must be separately configured in the pellet production system in order to solve the production stability problem of the double-roller pellet mill in the German technology and various imitations of my country. Therefore, the technology of the present invention can effectively simplify and reduce the technical requirements and production manufacturing costs of the pellet production system, and facilitate use and operation in production.

[0048] (2) Compared with the double-roller type double-ring die granulator with balanced feeding and pre-compression provided in CN 112221430 A, the present invention adopts the technology of "scraper-type balanced feeding and pre-compression device 30", thereby constructing a "balanced feeding, uniform feeding and pre-compression system" of the double-roller type double-ring die granulator through the relative movement and mutual action between the first double-roller ring die 1, the second double-roller ring die 2 and the two scrapers or scrapers 301, further solving the problems of complex structure, low silo utilization, affected feeding, and the need to improve the effect and stability of balanced feeding and pre-compression.

[0049] (3) The present invention has the characteristics of simple structure, reliability and high efficiency, can solve the working stability problem of the double-roll ring die pelletizer, and provide relevant technology and equipment for biomass pellet forming, especially for straw and fiber biomass pellet forming.

[0050] (4) The scraper-type balanced feeding pre-compression device 30 and system described in the present invention, or the scraper-type balanced feeding device therein, can also be used as a balanced feeding system for various grinders and crushers.

[0051] The present invention does not involve parts that are the same as the prior art or can be implemented by using the prior art.

Claims

1. A double-roller double-ring die granulator based on a scraper-type balanced feed pre-compression system, characterized in that: The double roller ring die pelletizer adopts a top feeding method, and comprises a pelletizer body (01), a silo (02), a first pair of roller ring dies (1), a second pair of roller ring dies (2) and a scraper-type balanced feeding pre-compression device (30). The scraper-type balanced feeding pre-compression device (30) is composed of a pressure roller (302) and scrapers or scrapers (301) on both sides. When working, the material enters the pelletizer silo (02) from the upper part of the pelletizer, and the material is transported to the middle pre-compression zone (6) under the joint drive of the first pair of roller ring dies (1) and the second pair of roller ring dies (2) in relative motion. The scraper or scraper (301) and the corresponding first pair of roller ring dies (1) and the second pair of roller ring dies (2) are used to press the material. The roller ring die (1) and the second roller ring die (2) form a "balanced feeding system" of the roller double-ring die pelletizer; the pressure roller (302) in the scraper-type balanced feeding pre-compression device (30) and the first roller ring die (1) and the second roller ring die (2) form a "pre-compression system" of the roller double-ring die pelletizer; further, through the relative movement and mutual action between the first roller ring die (1), the second roller ring die (2) and the scraper-type balanced feeding pre-compression device (30), a "scraper-type balanced feeding pre-compression system" is constructed to achieve balanced feeding, material distribution and pre-compression control of the roller double-ring die pelletizer; The material bin (02) is arranged at the upper part of the machine body (01); the first pair of roller ring dies (1), the second pair of roller ring dies (2) and the scraper-type balanced feeding pre-compression device (30) are supported in parallel in the machine body (01); the axes of the first pair of roller ring dies (1) and the second pair of roller ring dies (2) are arranged horizontally; the scraper-type balanced feeding pre-compression device (30) is located above the symmetric center of the first pair of roller ring dies (1) and the second pair of roller ring dies (2), and can be adjusted and fixed in the vertical direction; The scraper-type balanced feed pre-compression device (30) is composed of a pressure roller (302), a scraper or a scraper plate (301), a scraper adjustment assembly screw (303), an assembly shaft (304), and a circumferential positioning adjustment slider (305). The pressure roller (302) is fixed in the material bin (02) through the assembly shaft (304). The height of the assembly shaft (304) is adjustable. The circumferential positioning adjustment slider (305) is inserted into the installation groove in the corresponding material bin (02) to prevent the pressure roller (302) from rotating in the circumferential direction. The scraper or the scraper plate (301) is fixed to the pressure roller (302) through the screw (303), and the installation and fixing height in the vertical direction is adjustable to adjust the distance between the horizontal cutting edge of the scraper or the scraper plate (301) and the corresponding first pair of roller ring dies (1) and second pair of roller ring dies (2). The cross section of the pressing roller (302) is a convex-shaped structure, and the lower part of the convex-shaped structure is a semi-cylindrical structure; A pre-compression zone (6) is formed between the cylindrical surface of the lower half of the compression roller (302) in the scraper-type balanced feed pre-compression device (30) and the outer cylindrical surfaces of the first pair of roller ring dies (1) and the second pair of roller ring dies (2); The pressure roller (302) of the scraper-type balanced feed pre-compression device (30) can be adjusted and fixed up and down and left and right along the vertical or horizontal direction of the machine body (01) by means of an adjustment and fixing device; and the scraper-type balanced feed pre-compression device (30) is used to adjust and fix the position up and down along the vertical direction to control the radial clearance between the cylindrical surface of the lower half of the pressure roller (302) in the scraper-type balanced feed pre-compression device (30) and the first pair of roller ring dies (1) and the second pair of roller ring dies (2), so as to achieve the control of the pre-compression amount and pre-compression effect of the roller double-ring die pelletizer; The scraper or scraper plate (301) in the scraper-type balanced feed pre-compression device (30) can be adjusted and fixed in an up-down or horizontal position relative to the balanced feed pre-compression roller (302); by adjusting and fixing the position of the scraper or scraper plate (301), the radial gap between the blade edge of the scraper or scraper plate (301) and the corresponding first pair of roller ring dies (1) and second pair of roller ring dies (2) is controlled to achieve the balanced feed amount of the double roller ring die pelletizer, and while ensuring balanced feed, the material is evenly distributed along the axial direction of the ring die, thereby achieving the effects of balanced feed and material leveling.

2. The double-roller double-ring die granulator based on the scraper-type balanced feed pre-compression system according to claim 1, characterized in that: The front angles of the cutting edges of the two scrapers or scrapers (301) in the scraper-type balanced feeding pre-compression device (30) are positive or negative, so as to meet the granulation requirements of different materials.

3. A roller double-ring die granulator based on a scraper-type balanced feed pre-compression system according to claim 1, characterized in that: The scraper-type balanced feeding pre-compression device (30) is used for balanced feeding systems of various pulverizers and crushers.

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