Double-rotor hammer mill

Abstract

The utility model discloses a double-rotor hammer mill which comprises a mill body shell, an upper crushing chamber and a lower crushing chamber which are vertically overlapped are arranged in an inner cavity of the mill body shell, a material distribution chamber is arranged on the upper portion of the upper crushing chamber, a feeding port is formed in the upper end of the material distribution chamber, a material guide plate capable of changing the feeding direction is arranged in the material distribution chamber, and an upper rotor is arranged in an inner cavity of the upper crushing chamber. The upper crushing chamber is enveloped on the periphery of the rotating track of the upper rotor, the bottom of the upper crushing chamber is communicated with the top of the lower crushing chamber through a throat, a lower rotor is arranged in an inner cavity of the lower crushing chamber, the lower crushing chamber is enveloped on the periphery of the rotating track of the lower rotor, and a settling chamber is arranged at the bottom of the lower crushing chamber. Adjusting flashboards are arranged on the two sides of the throat respectively, the outer ends of the two adjusting flashboards are connected with the inner ends of corresponding adjusting screws respectively, and the outer ends of the adjusting screws extend out of the machine body shell and are connected with adjusting nuts in a screwed mode respectively. According to the double-rotor hammer crusher, materials can be uniformly distributed and beaten, the crushing efficiency is improved, the crushing fineness is improved, and the energy consumption of equipment is reduced.

Description

Technical Field

[0001] This utility model relates to a crusher, and more particularly to a dual-rotor hammer crusher, belonging to the technical field of crushing equipment. Background Technology

[0002] Crushing is a crucial process in feed production, typically using a hammer mill. A traditional hammer mill consists of a crushing rotor mounted on a main shaft, supported at both ends by bearings on a frame. Hammer holders are installed at regular intervals on the main shaft, with multiple evenly distributed pin holes on each holder. The hammers are mounted on the pins and separated from each other by spacers. A screen with densely packed mesh surrounds the rotor, forming a closed space larger than the rotor's diameter, constituting the crushing chamber.

[0003] When the crusher is working, the main shaft drives the hammer holder plate, which in turn drives the hammers mounted on the pins to rotate at high speed, causing the hammers to spread out centrifugally. The material enters the crushing chamber from the feed inlet at the top of the crusher through the feeding device. The material's descent speed is relatively low, and it comes into contact with the hammers when it enters the crushing zone of the crushing chamber. The linear velocity of the hammers is relatively high, and due to the huge velocity difference between the two, the material is crushed by impact. Then, under the action of centrifugal force, the material flies towards the screen plate and collides with the screen plate again, turning large particles into small particles. The crushed small particles pass through the screen holes and are discharged from the discharge port under the action of gravity and the auxiliary suction system.

[0004] When the material undergoes high-speed centrifugal motion, it forms a circulating layer that rotates along the screen surface. This circulating layer reduces the relative speed at which the hammers strike the material, weakening the effectiveness of the strike. The material on the outer periphery of the circulating layer is detached from the hammer strike. Moreover, at each point in the circulating layer, the arcuate tangent of the screen is in the same direction as the tangent of the material flow, making it difficult for the material to change direction and hindering the formation of the circulating layer.

[0005] To improve crushing efficiency, dual-rotor hammer mills have emerged on the market. For example, Chinese utility model patent with publication number CN 213315305U discloses a "dual-rotor hammer mill feed crusher" in which the axes of the two crushing rotors are parallel to each other and arranged in the same horizontal plane. The two crushing rotors can disrupt the circulation layer of the material, and the material can be impacted at double speed in the middle of the two rotors, thus improving the crushing efficiency.

[0006] The existing dual-rotor hammer mill still has the following defects: the material cannot move actively in the crushing chamber of the horizontally set dual rotors, resulting in uneven feeding and inability to improve the fineness, that is, the fineness of the crushing has reached the upper limit; and the passive movement of the material causes the load on the two rotors to be inconsistent, resulting in different wear. Utility Model Content

[0007] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0008] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0009] The purpose of this invention is to overcome the problems existing in the prior art and provide a dual-rotor hammer mill that can achieve uniform material distribution and impact, improve crushing efficiency, increase crushing fineness, and reduce equipment energy consumption.

[0010] To solve the above technical problems, this utility model provides a dual-rotor hammer mill, including a machine body shell. The inner cavity of the machine body shell is provided with an upper crushing chamber and a lower crushing chamber stacked vertically. The upper crushing chamber is provided with a material distribution chamber at its upper part, and a material inlet is provided at the upper end of the material distribution chamber. A guide plate capable of changing the feeding direction is provided in the material distribution chamber. An upper rotor is provided in the inner cavity of the upper crushing chamber, and the upper crushing chamber surrounds the outer periphery of the rotation trajectory of the upper rotor. The bottom of the upper crushing chamber is connected to the top of the lower crushing chamber through a throat. A lower rotor is provided in the inner cavity of the lower crushing chamber, and the lower crushing chamber surrounds the outer periphery of the rotation trajectory of the lower rotor. A settling chamber is provided at the bottom of the lower crushing chamber.

[0011] Furthermore, the lower end of the guide plate is hinged to the bottom center of the distribution chamber via a guide shaft, and the upper part of the guide plate is tilted to one side to guide the material into the upper crushing chamber.

[0012] Furthermore, the lower inner wall of the material distribution chamber is provided with material distribution chamber toothed plates on both sides, the lower circumference of the upper crushing chamber is symmetrically provided with an upper screen plate, the lower end of the upper screen plate is provided with a lower toothed plate of the upper crushing chamber between the throat, the upper circumference of the upper crushing chamber is provided with an upper toothed plate of the upper crushing chamber, the upper end of the upper toothed plate of the upper crushing chamber is connected with the lower end of the material distribution chamber toothed plate, and the lower end of the upper toothed plate of the upper crushing chamber extends to the middle of the upper crushing chamber and is connected with the upper end of the upper screen plate.

[0013] Furthermore, upper toothed plates for the lower crushing chamber are provided on both sides of the upper part of the lower crushing chamber, that is, on both sides below the throat. Lower screen plates are provided at the lower ends of the upper toothed plates, and the lower ends of the lower screen plates are connected to the upper ports of the settling chamber on both sides.

[0014] Furthermore, an upper pressing chain is provided on the outer periphery of the upper screen plate, and a lower pressing chain is provided on the outer periphery of the lower screen plate.

[0015] Furthermore, the upper rotor has an upper rotor shaft at its center, and the lower rotor has a lower rotor shaft at its center. The axes of the upper rotor shaft and the lower rotor shaft are parallel to each other, and their respective ends are supported on the housing by bearing seats. The drive ends of the upper rotor shaft and the lower rotor shaft are driven by their respective motors and rotate in the same direction.

[0016] Furthermore, adjusting gates are provided on both sides of the throat connecting the upper and lower crushing chambers. The outer ends of the two adjusting gates are connected to the inner ends of the corresponding adjusting screws. The outer ends of the adjusting screws extend out of the machine body and are screwed with adjusting nuts.

[0017] Furthermore, quick-opening sealing doors are provided on the lower sides of the fuselage.

[0018] Compared with the prior art, this utility model has achieved the following beneficial effects: 1. By changing the dual rotors to a vertical distribution, the material achieves active flow. During the flow process, the material first passes through the upper rotor for multiple impacts and crushing, and separates the material with qualified fineness. The unqualified material passes through the toothed plate and hammer blades again, the double-speed impact in the middle of the dual rotors, and the impact between the hammer blades and toothed plate of the lower rotor. After multiple impacts, the material is screened, and then crushed again until it is completely crushed and qualified. This increases the number of impacts, and completes finer crushing of the material.

[0019] 2. This dual-rotor hammer mill has low noise, low energy consumption, improves grinding fineness and output, and reduces installation space. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0021] Figure 1 This is a front view of the dual-rotor hammer mill of this utility model;

[0022] Figure 2 for Figure 1 Sectional view along the middle AA;

[0023] Figure 3 This is a perspective view of the dual-rotor hammer mill of this utility model;

[0024] In the diagram: 1. Machine casing; 1a. Feed inlet; 1b. Quick-opening sealing door; 2. Distributor chamber; 2a. Distributor chamber toothed plate; 3. Guide plate;

[0025] 4. Upper grinding chamber; 4a. Upper toothed plate of the upper grinding chamber; 4b. Upper sieve plate; 4c. Lower toothed plate of the upper grinding chamber;

[0026] 5. Upper rotor; 5a. Upper rotor shaft; 5b. Upper rotor hammers;

[0027] 6. Upper screen pressing chain;

[0028] 7. Adjusting gate; 7a. Adjusting screw;

[0029] 8. Lower grinding chamber; 8a. Upper toothed plate of the lower grinding chamber; 8b. Lower sieve plate;

[0030] 9. Lower rotor; 9a. Lower rotor shaft; 9b. Lower rotor hammers;

[0031] 10. Settling chamber; 11. Lower screen chain; 12. Motor. Detailed Implementation

[0032] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0033] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] like Figures 1 to 3 As shown, the dual-rotor hammer mill of this utility model includes a casing 1. The inner cavity of the casing 1 is provided with an upper crushing chamber 4 and a lower crushing chamber 8 stacked vertically. The upper part of the upper crushing chamber 4 is provided with a distribution chamber 2, and the upper end of the distribution chamber 2 is provided with a feed inlet 1a. The distribution chamber 2 is provided with a guide plate 3. The inner cavity of the upper crushing chamber 4 is provided with an upper rotor 5, and the upper crushing chamber 4 surrounds the outer periphery of the rotation trajectory of the upper rotor 5. The bottom of the upper crushing chamber 4 and the top of the lower crushing chamber 8 are connected by a throat. The inner cavity of the lower crushing chamber 8 is provided with a lower rotor 9, and the lower crushing chamber 8 surrounds the outer periphery of the rotation trajectory of the lower rotor 9. The bottom of the lower crushing chamber 8 is provided with a settling chamber 10.

[0036] The lower end of the guide plate 3 is hinged to the bottom center of the distribution chamber 2 via a guide shaft. The upper part of the guide plate 3 is tilted to one side to guide the material into the upper crushing chamber 4. When the upper rotor 5 rotates counterclockwise, the lower rotor 9 also rotates counterclockwise, which makes it easier for the material to fly in opposite directions between the upper rotor 5 and the lower rotor 9, and the material between the two rotors is hit by double the linear velocity. At this time, the upper end of the guide plate 3 is tilted to the right, which makes it easier for the material entering the distribution chamber 2 to quickly enter the material flow of the upper crushing chamber 4.

[0037] In order to extend the service life of the hammer blades and make their wear more even, after running for a period of time, it is necessary to adjust the upper rotor 5 and the lower rotor 9 to rotate clockwise. At this time, the guide plate 3 will switch to tilt to the left at the top.

[0038] The lower inner wall of the material distribution chamber 2 is provided with material distribution chamber toothed plates 2a on both sides. The lower circumference of the upper crushing chamber 4 is symmetrically provided with upper screen plates 4b. The lower end of the upper screen plate 4b and the throat are respectively provided with lower toothed plates 4c of the upper crushing chamber. The upper circumference of the upper crushing chamber 4 is provided with upper toothed plates 4a of the upper crushing chamber. The upper end of the upper toothed plates 4a of the upper crushing chamber is connected with the lower end of the material distribution chamber toothed plates 2a. The lower end of the upper toothed plates 4a of the upper crushing chamber extends to the middle of the upper crushing chamber 4 and is connected with the upper end of the upper screen plate 4b.

[0039] The upper two sides of the lower crushing chamber 8, that is, the two sides below the throat, are respectively provided with upper toothed plates 8a. The lower ends of the upper toothed plates 8a are respectively provided with lower screen plates 8b. The lower ends of the lower screen plates 8b are respectively connected to the upper ports of the settling chamber 10.

[0040] The upper screen plate 4b is provided with an upper pressing chain 6 on its outer periphery, and the lower screen plate 8b is provided with a lower pressing chain 11 on its outer periphery, which facilitates the replacement of screen plates and quick pressing.

[0041] Upper rotor 5 has upper rotor hammers 5b distributed around its outer periphery, and lower rotor 9 has lower rotor hammers 9b distributed around its outer periphery. The upper rotor 5 has an upper rotor shaft 5a at its center, and the lower rotor 9 has a lower rotor shaft 9a at its center. The axes of the upper rotor shaft 5a and the lower rotor shaft 9a are parallel to each other, and both ends are supported on the casing 1 by bearing seats. An upper rotor shaft drive wheel is installed at one end of the upper rotor shaft 5a, and a lower rotor shaft drive wheel is installed at the same end of the lower rotor shaft 9a. Both the upper and lower rotor shaft drive wheels are driven by their respective motors 12 and rotate in the same direction.

[0042] When the motor 12 drives the upper rotor 5 and the lower rotor 9 to rotate at high speed via the belt and the upper rotor shaft drive wheel and the lower rotor shaft drive wheel, the outer edges of the hammers on the outer periphery of the upper rotor 5 and the lower rotor 9 rotate at high speed against the screen plate of the crushing chamber to crush the material.

[0043] During operation, after the material enters the crusher, it collides with the guide plate 3 and is then guided by the guide plate 3 into the upper crushing chamber 4. There, it is crushed by the high-speed rotating hammers of the upper rotor 5. First, it collides with the upper toothed plate 4a of the upper crushing chamber on one side, then moves at high speed along the screen surface of the upper screen plate 4b and rubs against the screen surface, resulting in further crushing. Next, it collides with the lower toothed plate 4c of the upper crushing chamber and is crushed again. Then, the material reaches the throat between the upper crushing chamber 4 and the lower crushing chamber 8. Because the material flies in opposite directions at this point, it is subjected to double the linear velocity of the hammers. A portion of the material continues to accelerate in the upper crushing chamber 4, colliding with the lower toothed plate 4c of the upper crushing chamber on the other side, then rubbing against the screen surface of the upper screen plate 4b on the other side, and then colliding with the upper toothed plate 4a of the upper crushing chamber on the other side. When passing the top of the upper crushing chamber 4, the material collides with the guide plate 3 and the toothed plate 2a of the distribution chamber, causing multiple abrupt changes in the material flow direction, disrupting the circulation layer, increasing the relative velocity between the material and the hammers, and improving the crushing effect.

[0044] Another portion of the material, after being struck by the hammer blades at twice the linear velocity, passes through the throat and enters the lower crushing chamber 8. In the acceleration section, it first impacts the upper toothed plate 8a of the lower crushing chamber on one side and is crushed. Then, it moves at high speed along the screen surface of the lower screen plate 8b on one side and is broken by friction with the screen surface. When it reaches the full-speed zone at the bottom of the lower crushing chamber 8, the material collides with the settling chamber 10, causing a sudden change in the material flow direction. The material circulation layer is destroyed, increasing the relative velocity between the material and the hammer blades. This causes the material to re-accelerate after passing through the settling chamber 10, thus improving the crushing effect. Then the material continues to move at high speed along the screen surface of the lower screen plate 8b on the other side and is crushed by friction with the screen surface. Then it collides with the upper toothed plate 8a of the lower crushing chamber on the other side and is crushed. Then the material reaches the throat between the lower crushing chamber 8 and the upper crushing chamber 4 and is hit by the hammer blades at double the linear velocity. Then the above collision and impact process is repeated in the lower crushing chamber 8. The crushed particles smaller than the screen holes are drawn through the screen holes by the negative pressure at the outlet and enter the discharge space between the crushing chamber and the machine body 1, and are discharged from the discharge port at the bottom of the machine body 1.

[0045] Adjustable gates 7 are provided on both sides of the throat connecting the upper crushing chamber 4 and the lower crushing chamber 8. The distance between the opposing ends of the two adjustable gates 7 is the opening width of the throat. The outer ends of the two adjustable gates 7 are respectively connected to the inner ends of the corresponding adjusting screws 7a. The outer ends of the adjusting screws 7a extend out of the machine body housing 1 and are each screwed with an adjusting nut. The throat width can be adjusted by rotating the outer ends of the adjusting screws 7a.

[0046] For different materials, the opening width of the throat is changed by adjusting the insertion depth of the two side regulating gates 7, thereby adjusting the load of the upper rotor 5 and the lower rotor 9 to make the wear of the upper and lower rotors consistent.

[0047] Quick-opening sealing doors 1b are added to the lower parts of both sides of the machine body 1, which facilitates material cleaning and reduces noise.

[0048] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A double rotor hammer mill comprising a machine body casing (1), characterized in that, The inner cavity of the casing (1) is provided with an upper crushing chamber (4) and a lower crushing chamber (8) stacked vertically. The upper part of the upper crushing chamber (4) is provided with a material distribution chamber (2). The upper end of the material distribution chamber (2) is provided with a feed inlet (1a). The material distribution chamber (2) is provided with a guide plate (3) that can change the feeding direction. The inner cavity of the upper crushing chamber (4) is provided with an upper rotor (5). The upper crushing chamber (4) surrounds the outer periphery of the rotation trajectory of the upper rotor (5). The bottom of the upper crushing chamber (4) and the top of the lower crushing chamber (8) are connected by a throat. The inner cavity of the lower crushing chamber (8) is provided with a lower rotor (9). The lower crushing chamber (8) surrounds the outer periphery of the rotation trajectory of the lower rotor (9). The bottom of the lower crushing chamber (8) is provided with a settling chamber (10). The lower inner wall of the material distribution chamber (2) is provided with material distribution chamber toothed plates (2a) on both sides. The lower circumference of the upper crushing chamber (4) is provided with upper screen plates (4b). The lower end of the upper screen plate (4b) and the throat are respectively provided with upper crushing chamber lower toothed plates (4c). The upper circumference of the upper crushing chamber (4) is provided with upper crushing chamber upper toothed plates (4a). The upper end of the upper crushing chamber upper toothed plates (4a) is connected to the lower end of the material distribution chamber toothed plates (2a). The lower end of the upper crushing chamber upper toothed plates (4a) extends to the middle of the upper crushing chamber (4) and is connected to the upper end of the upper screen plate (4b).

2. The dual-rotor hammermill of claim 1, wherein: The lower end of the guide plate (3) is hinged to the bottom center of the distribution chamber (2) via a guide shaft, and the upper part of the guide plate (3) is tilted to one side to guide the material into the upper crushing chamber (4).

3. The dual-rotor hammermill of claim 1, wherein: The upper sides of the lower crushing chamber (8), that is, the sides below the throat, are respectively provided with upper toothed plates (8a). The lower ends of the upper toothed plates (8a) are respectively provided with lower screen plates (8b). The lower ends of the lower screen plates (8b) are respectively connected to the upper ports of the settling chamber (10).

4. The dual-rotor hammermill of claim 3, wherein: The upper screen plate (4b) is provided with an upper pressure screen chain (6) on its outer periphery, and the lower screen plate (8b) is provided with a lower pressure screen chain (11) on its outer periphery.

5. The dual-rotor hammermill of claim 1, wherein: The upper rotor (5) has an upper rotor shaft (5a) at its center, and the lower rotor (9) has a lower rotor shaft (9a) at its center. The axes of the upper rotor shaft (5a) and the lower rotor shaft (9a) are parallel to each other and their ends are supported on the housing (1) by bearing seats. The driving ends of the upper rotor shaft (5a) and the lower rotor shaft (9a) are driven by their respective motors (12) and rotate in the same direction.

6. The dual-rotor hammermill of claim 1, wherein: Adjusting gates (7) are provided on both sides of the throat connecting the upper crushing chamber (4) and the lower crushing chamber (8). The outer ends of the two adjusting gates (7) are connected to the inner ends of the corresponding adjusting screws (7a). The outer ends of the adjusting screws (7a) extend out of the machine body housing (1) and are respectively screwed with adjusting nuts.

7. Double rotor hammer mill according to any of claims 1 to 6, characterized in that: The lower sides of the fuselage housing (1) are respectively provided with quick-opening sealing doors.

Images