Direct-driven impact mill

Abstract

The invention relates to a direct drive type impact mill which comprises a machine shell, a pump drainage pipe is outwards arranged in the middle of the top of the machine shell, and a grading wheel is rotationally installed at the feeding end of the pump drainage pipe; the material crushing assembly comprises a grinding ring installed in the middle of the machine shell, a material crushing disc is arranged on the inner side of the grinding ring, a plurality of crushing hammer heads are evenly distributed and fixedly connected to the periphery of the material crushing disc, and material distributing plates connected to the crushing hammer heads are fixedly connected to the material crushing disc; the driving mechanism comprises a material crushing motor, an output shaft of the driving mechanism is in transmission connection to the center of the material crushing disc, and the output shaft is rotationally mounted on a shell of the material crushing motor through a plurality of magnetic suspension bearings; the feeding assembly comprises a material guiding cover, a feeding pipe is installed on the material guiding cover in a communicating mode, a material collecting cover is arranged in the center of the material crushing disc, and the bottom of the material collecting cover and the material crushing disc are arranged in a spaced mode. According to the invention, the over-temperature problem of the bearing for installation can be effectively overcome, and the transmission amount of vibration to the material crushing motor can be reduced, so that the material crushing motor is integrally integrated in the shell to directly drive the material crushing disc.

Description

Technical Field

[0001] This invention relates to the field of material grinding equipment technology, specifically to a direct-drive impact mill, in which the crushing motor is integrated inside the mill housing to directly drive the crushing disc, eliminating the need for additional motor bases and belt tension adjustment devices, effectively simplifying the equipment size and reducing space occupation. Background Technology

[0002] Impact mills are commonly used equipment for material crushing and processing. Conventional impact mills primarily rely on a crushing motor driving a drive pulley, which in turn rotates the crushing disc to achieve the crushing operation. Raw materials enter the crushing zone of the crushing disc through the feed inlet of the upper cylinder. The crushing disc, driven by the crushing motor, rotates at high speed to crush the material. After crushing, the material enters the grading zone of the upper cylinder for separation and screening. Qualified material passes through the grading wheel and enters the subsequent finished product collection device (dust collector) for collection. Unqualified material is separated by the grading wheel and falls back to the crushing zone for secondary crushing.

[0003] The existing conventional belt drive design of impact mills has two main drawbacks: firstly, the belt drive cannot fully transmit the power of the crushing motor, resulting in wasted power; secondly, the crushing motor operates at speeds between 2000-3000 r / min, and the high-speed rotating bearing housing requires high standards for lubrication, heat dissipation, and bearing quality. Economically, manufacturing costs are typically high. Furthermore, this type of impact mill requires a large space allocation for the motor base and belt tension adjustment devices, which is detrimental to production process design. Therefore, some manufacturers have begun to integrate the crushing motor into the mill housing for direct drive of the crushing disc. However, this direct drive method presents two technical problems: 1) The bearings mounting the output shaft of the crushing motor often overheat due to high-speed rotation, leading to coil overheating within the motor itself; 2) The significant vibrations during the crushing process are directly transmitted to the output shaft of the crushing motor, shortening its lifespan.

[0004] Therefore, the research objective of this invention is to design a direct-drive impact mill that can effectively overcome the overheating problem of the mounting bearing caused by high-speed rotation and effectively reduce the amount of vibration transmitted to the output shaft of the crushing motor during the crushing process, so as to ensure that the crushing motor can reach its normal service life and thus effectively integrate the crushing motor into the housing of the impact mill to directly drive the crushing disc. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the present invention provides a direct-drive impact mill that can effectively solve the technical problems existing in the prior art.

[0006] The technical solution of this invention is: A direct-drive impact mill, comprising: The casing has an exhaust pipe connected to an external ventilation system located outward from the center of its top. A grading wheel is rotatably mounted on one side of the feed end of the exhaust pipe, and the grading wheel is driven by a grading motor mounted on the upper side of the exhaust pipe. The crushing assembly includes a grinding ring fixedly installed in the middle of the housing. A crushing disc adapted to the grinding ring is provided on the inner side of the grinding ring. Multiple corresponding crushing hammers are evenly distributed and fixed at the periphery of the crushing disc, and a material distribution plate connected to the crushing hammers is fixedly connected to the crushing disc in a ring array. The drive mechanism includes a shredder motor mounted on the lower side of the housing. The output shaft of the shredder motor is connected to the center of the shredder disk, and the output shaft is rotatably mounted on the housing of the shredder motor via several magnetic levitation bearings. The feeding assembly includes a guide cover fixed between the grading wheel and the crushing assembly. The guide cover is a truncated cone-shaped cylinder that is wider at the top and narrower at the bottom. A feed pipe extending through and to the outside of the housing is connected to the guide cover. A corresponding collecting cover is provided at the center of the crushing disc. The collecting cover is a truncated cone-shaped cylinder that is narrower at the top and wider at the bottom. The bottom of the collecting cover is fixed to the dividing plate and spaced apart from the crushing disc. The top of the collecting cover is directly opposite the bottom of the guide cover.

[0007] From bottom to top, the inner wall of the grinding ring is inclined outward, and multiple corresponding abrasive grooves are evenly distributed in a ring array on the inner wall of the grinding ring.

[0008] The grinding ring is fixed to the housing via a corresponding mounting sleeve.

[0009] The bottom side of the housing is provided with several corresponding air inlets, and a bucket-shaped baffle located on the bottom side of the crushing assembly is installed inside the housing. The center of the bucket-shaped baffle is provided with corresponding ventilation holes.

[0010] The bottom side of the bucket-shaped baffle is fixed with multiple reinforcing ribs that are connected to the inner wall of the housing at intervals.

[0011] A vibration damping pad, made of rubber, is fixedly attached to the center of the shredder disc and covers the output shaft of the shredder motor.

[0012] The outer wall of the material collection hood is provided with corresponding fixing boxes at positions corresponding to the material distribution plate. Corresponding coil springs are installed in the fixing boxes. Corresponding damping blocks are slidably mounted horizontally on the material distribution plate. The damping blocks are hollow and filled with corresponding damping materials, and are connected to the corresponding coil springs.

[0013] The vibration damping material is made of spherical damping particles made of metal or polymer materials.

[0014] A corresponding arc-shaped push plate is fixedly installed inside the housing by a corresponding inverted L-shaped rod. The arc-shaped push plate faces the damping block and is used to push the damping block inward during rotation.

[0015] The vibration damping block is arranged in the shape of a hollow column. The bottom side of the vibration damping block is provided with a sliding groove that is slidably attached to the material distribution plate. The top of the vibration damping block is detachably equipped with an end cover plate for sealing its hollow part.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1) The drive mechanism of this invention includes a shredder motor, whose output shaft is driven to the center of the shredder disc to achieve direct drive of the shredder disc. To overcome the overheating problem of the mounting bearings caused by the high-speed rotation of the direct drive, this invention uses several magnetic levitation bearings to rotatably mount the output shaft of the shredder motor onto its housing, thereby effectively overcoming the overheating problem of the mounting bearings caused by the high-speed rotation. At the same time, this invention improves the design of the feeding assembly, which includes a guide cover that is wider at the top and narrower at the bottom, and a feeding pipe that extends through to the outside of the housing is connected and installed on the guide cover. A collection hood is installed at the center of the crushing disc. The collection hood is shaped like a frustum, narrow at the top and wide at the bottom. The bottom of the collection hood is fixed to the distribution plate of the crushing disc and is spaced apart from the crushing disc. This allows the feed material and the material screened by the grading wheel to be uniformly collected and discharged into the collection hood. Under the action of centrifugal force, the material is evenly dispersed through the gap between the collection hood and the crushing disc for output. This prevents the crushing disc from vibrating excessively due to uneven material distribution, thereby controlling the vibration during the crushing process to a low range and ensuring that the crushing motor can reach its normal service life.

[0017] This effectively integrates the crushing motor into the casing of the impact mill to directly drive the crushing disc, eliminating the need for additional motor bases and belt tension adjustment devices, thus simplifying the equipment size and reducing space occupation.

[0018] 2) A vibration damping pad is fixed at the center of the crushing disc of the present invention and covers the output shaft of the crushing motor. The vibration damping pad is made of rubber material. The intervention of the vibration damping pad prevents excessive collision of the output shaft of the crushing motor during the process of material concentrating into the collection hood, thereby helping to reduce the amount of vibration transmitted to the output shaft of the crushing motor and ensuring the practical effect of the present invention.

[0019] 3) The outer wall of the material collection hood of the present invention is provided with corresponding fixing boxes at positions corresponding to the material distribution plate. Corresponding coil springs are installed inside each fixing box. Corresponding vibration damping blocks are horizontally slidably mounted on the material distribution plate. Each vibration damping block is hollow and filled with corresponding vibration damping material, and is connected to a corresponding coil spring. As the crushing disc rotates, the vibration damping blocks effectively move horizontally outward along the material distribution plate. When the vibration damping block rotates past the position of the arc-shaped baffle plate, it is pushed inward by the arc-shaped baffle plate, thus realizing the back-and-forth movement of the vibration damping block during the rotation of the crushing disc. This actively absorbs a large amount of vibration generated by the crushing process, thereby effectively and significantly reducing the amount of vibration transmitted to the output shaft of the crushing motor during the crushing process. This effectively overcomes the impact of the large amount of vibration generated during the crushing process on the service life of the crushing motor, and thus effectively and significantly improves the practical effect of the present invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0021] Figure 2 This is a cross-sectional view of Embodiment 1 of the present invention.

[0022] Figure 3 This is an assembly diagram of the material crushing assembly and the drive mechanism.

[0023] Figure 4 This is a schematic diagram of a structure with crushing hammers installed on a crushing disc.

[0024] Figure 5 This is a cross-sectional view of Embodiment 2 of the present invention.

[0025] Figure 6 This is a schematic diagram of the material crushing assembly according to Embodiment 2 of the present invention.

[0026] Figure 7 for Figure 6 A magnified view of part A in the image.

[0027] In the attached diagram: 1. Housing; 2. Exhaust pipe; 3. Grading wheel; 4. Grading motor; 5. Crushing assembly; 501. Grinding ring; 502. Crushing disc; 503. Crushing hammer; 6. Dividing plate; 7. Drive mechanism; 701. Crushing motor; 702. Output shaft; 703. Magnetic levitation bearing; 8. Feeding assembly; 801. Guide cover; 802. Feeding pipe; 9. Collection cover; 10. Grinding trough; 11. Mounting cylinder; 12. Air inlet; 13. Bucket-shaped baffle; 14. Ventilation hole; 15. Reinforcing rib plate; 16. Fixing box; 17. Coil spring; 18. Vibration damping block; 19. Vibration damping material; 20. Inverted L-shaped rod; 21. Arc-shaped baffle plate; 22. End cover plate; 23. Vibration damping buffer pad. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Example 1 refer to Figure 1-4 A direct-drive impact mill, comprising: The housing 1 has an exhaust pipe 2 connected to an external ventilation system, which is provided outward from the middle of the top of the housing 1. A classifying wheel 3 is rotatably installed on one side of the feed end of the exhaust pipe 2. The classifying wheel 3 is driven by a classifying motor 4 installed on the upper side of the exhaust pipe 2. The crushing assembly 5 includes a grinding ring 501 fixedly installed in the middle of the housing 1. A crushing disc 502 adapted to the inner side of the grinding ring 501 is provided. Multiple corresponding crushing hammers 503 are evenly distributed and fixed at the periphery of the crushing disc 502. A material distribution plate 6 connected to the crushing hammers 503 is fixedly connected in a ring array on the crushing disc 502. The drive mechanism 7 includes a shredder motor 701 mounted on the lower side of the housing 1. The output shaft 702 of the shredder motor 701 is connected to the center of the shredder disk 502. The output shaft 702 is rotatably mounted on the housing of the shredder motor 701 via a plurality of magnetic levitation bearings 703. In this embodiment, the plurality of magnetic levitation bearings 703 mainly includes a set of radial magnetic levitation bearings and a set of axial magnetic levitation bearings. The feeding assembly 8 includes a guide cover 801 fixed between the grading wheel 3 and the crushing assembly 5. The guide cover 801 is a frustum-shaped cylinder that is wider at the top and narrower at the bottom. A feed pipe 802 that extends through and reaches the outside of the housing 1 is connected to the guide cover 801. A corresponding collecting cover 9 is provided at the center of the crushing disc 502. The collecting cover 9 is a frustum-shaped cylinder that is narrower at the top and wider at the bottom. The bottom of the collecting cover 9 is fixed to the dividing plate 6 and is spaced apart from the crushing disc 502. The top of the collecting cover 9 is directly opposite the bottom of the guide cover 801.

[0030] The drive mechanism 7 of this invention includes a shredder motor 701, whose output shaft 702 is driven to the center of the shredder disk 502 to achieve direct drive of the shredder disk 502. To overcome the overheating problem of the mounting bearings caused by the high-speed rotation of the direct drive, this invention uses several magnetic levitation bearings 703 to rotatably mount the output shaft 701 of the shredder motor 701 onto its housing, thereby effectively overcoming the overheating problem of the mounting bearings caused by the high-speed rotation. At the same time, this invention improves the design of the feeding assembly 8, which includes a guide cover 801 that is wider at the top and narrower at the bottom, and a feed tube extending through to the outside of the housing 1 is connected and mounted on the guide cover 801. The feed pipe 802 has a collection hood 9 at the center of the crushing disc 502. The collection hood 9 is a frustum-shaped structure that is narrower at the top and wider at the bottom. The bottom of the collection hood 9 is fixed to the distribution plate 6 of the crushing disc and is spaced apart from the crushing disc 502. This allows the feed material and the material screened by the grading wheel 3 to be uniformly collected and discharged into the collection hood 9. Under the action of centrifugal force, the material is evenly dispersed through the gap between the collection hood 9 and the crushing disc 502 for output. This prevents the crushing disc 502 from vibrating excessively due to uneven material dispersion, thereby controlling the vibration during the crushing process within a low range and ensuring that the crushing motor 701 can reach its normal service life.

[0031] This effectively integrates the crushing motor 701 into the casing 1 of the impact mill to directly drive the crushing disc 502, eliminating the need for additional motor bases and belt tension adjustment devices, thus simplifying the equipment size and reducing space occupation.

[0032] From bottom to top, the inner wall of the grinding ring 501 is inclined outward, and multiple corresponding abrasive grooves 10 are evenly distributed in a ring array on the inner wall of the grinding ring 501. The grinding ring 501 is fixed to the housing 1 by a corresponding mounting sleeve 11.

[0033] The bottom side of the housing 1 is provided with several corresponding air inlets 12. Inside the housing 1, a bucket-shaped baffle 13 located on the bottom side of the crushing assembly 5 is installed. The center of the bucket-shaped baffle 13 is provided with corresponding ventilation holes 14. The bottom side of the bucket-shaped baffle 13 is fixedly connected with a plurality of reinforcing ribs 15 at intervals to the inner side wall of the housing 1.

[0034] A vibration damping pad 23, made of rubber, is fixedly attached to the center of the crushing disc 502, covering the output shaft 702 of the crushing motor 701. The pad 23 prevents excessive impact on the output shaft 702 of the crushing motor 701 during material accumulation in the collection hood 9, thereby helping to reduce the amount of vibration transmitted to the output shaft 702 of the crushing motor 701 and ensuring the practical effectiveness of the invention.

[0035] Example 2 refer to Figure 5-7 The difference between this embodiment and Embodiment 1 is that: the outer wall of the material collection hood 9 is provided with corresponding fixing boxes 16 at positions corresponding to the material distribution plate 6, and corresponding coil springs 17 are installed in the fixing boxes 16. Corresponding damping blocks 18 are slidably mounted horizontally on the material distribution plate 6. The damping blocks 18 are hollow and filled with corresponding damping materials 19, and the damping blocks 18 are connected to the corresponding coil springs 17. The damping materials 19 are spherical damping particles made of metal.

[0036] A corresponding arc-shaped baffle plate 21 is fixedly installed inside the housing 1 by a corresponding inverted L-shaped rod 20. The arc-shaped baffle plate 21 faces the damping block 18 and is used to push the damping block 18 inward during the rotation process.

[0037] The vibration damping block 18 is arranged in a hollow column shape. The bottom side of the vibration damping block 18 is provided with a sliding groove that is slidably attached to the material distribution plate 6. The top of the vibration damping block 18 is detachably installed with an end cover plate 22 for sealing its hollow part.

[0038] During the crushing process, as the crushing disc 502 rotates, the vibration damping block 18 effectively moves horizontally outward along the distribution plate 6. When the vibration damping block 18 rotates past the position of the arc-shaped baffle plate 21, it is pushed inward by the arc-shaped baffle plate 21, so as to realize the back-and-forth movement of the vibration damping block 18 during the rotation of the crushing disc 502. This actively absorbs a large amount of vibration generated by crushing, thereby effectively and significantly reducing the amount of vibration transmitted to the output shaft 702 of the crushing motor 701 during the crushing process. This effectively overcomes the impact of the large amount of vibration generated during the crushing process on the service life of the crushing motor 701, and thus effectively and significantly improves the practical effect of the present invention.

[0039] It should be noted that this embodiment is implemented in the same way as embodiment one in terms of principle and technical effect. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in embodiment one.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A direct-drive impact mill, characterized in that, include: The casing (1) has an exhaust pipe (2) connected to an external ventilation system located in the middle of the top of the casing (1). A grading wheel (3) is rotatably installed on one side of the feed end of the exhaust pipe (2). The grading wheel (3) is driven by a grading motor (4) installed on the upper side of the exhaust pipe (2). The crushing assembly (5) includes a grinding ring (501) fixedly installed in the middle of the housing (1). The inner side of the grinding ring (501) is provided with a crushing disc (502) that is adapted to it. Multiple corresponding crushing hammers (503) are evenly distributed and fixed at the periphery of the crushing disc (502). The crushing disc (502) is also provided with a distribution plate (6) connected to the crushing hammers (503) in a ring array. The drive mechanism (7) includes a shredder motor (701) mounted on the lower side of the housing (1). The output shaft (702) of the shredder motor (701) is connected to the center of the shredder disk (502), and the output shaft (702) is rotatably mounted on the housing of the shredder motor (701) through a plurality of magnetic levitation bearings (703). The feeding assembly (8) includes a guide cover (801) fixed between the grading wheel (3) and the crushing assembly (5). The guide cover (801) is a truncated cone-shaped structure that is wider at the top and narrower at the bottom. A feed pipe (802) extending through and reaching the outside of the housing (1) is connected to the guide cover (801). A corresponding collection cover (9) is provided at the center of the crushing disc (502). The collection cover (9) is a truncated cone-shaped structure that is narrower at the top and wider at the bottom. The bottom of the collection cover (9) is fixed to the dividing plate (6) and spaced apart from the crushing disc (502). The top of the collection cover (9) is directly opposite the bottom of the guide cover (801).

2. The direct-drive impact mill according to claim 1, characterized in that, From bottom to top, the inner wall of the grinding ring (501) is inclined outward, and multiple corresponding abrasive grooves (10) are evenly distributed in a ring array on the inner wall of the grinding ring (501).

3. The direct-drive impact mill according to claim 1, characterized in that, The grinding ring (501) is fixed to the housing (1) by a corresponding mounting sleeve (11).

4. The direct-drive impact mill according to claim 1, characterized in that, The bottom side of the housing (1) is provided with several corresponding air inlets (12), and a bucket-shaped baffle (13) located on the bottom side of the crushing assembly (5) is installed inside the housing (1). A corresponding air vent (14) is provided at the center of the bucket-shaped baffle (13).

5. A direct-drive impact mill according to claim 4, characterized in that, The bottom side of the bucket-shaped baffle (13) is fixed with a plurality of reinforcing ribs (15) that are connected to the inner wall of the housing (1) at intervals.

6. A direct-drive impact mill according to claim 1, characterized in that, A vibration damping pad (23) is fixed at the center of the shredder (502) and covers the output shaft (702) of the shredder motor (701). The vibration damping pad (23) is made of rubber material.

7. A direct-drive impact mill according to claim 1, characterized in that, The outer wall of the material collection hood (9) is provided with corresponding fixing boxes (16) at positions corresponding to the material distribution plate (6). Corresponding coil springs (17) are installed in the fixing boxes (16). Corresponding damping blocks (18) are slidably connected to the material distribution plate (6) horizontally. The damping blocks (18) are hollow and filled with corresponding damping materials (19). The damping blocks (18) are connected to the corresponding coil springs (17).

8. A direct-drive impact mill according to claim 7, characterized in that, The damping material (19) is made of spherical damping particles made of metal or polymer materials.

9. A direct-drive impact mill according to claim 7 or 8, characterized in that, A corresponding arc-shaped baffle plate (21) is fixedly installed inside the housing (1) by a corresponding inverted L-shaped rod (20). The arc-shaped baffle plate (21) faces the damping block (18) and is used to push the damping block (18) inward during the rotation process.

10. A direct-drive impact mill according to claim 9, characterized in that, The vibration damping block (18) is arranged in a hollow column shape. The bottom side of the vibration damping block (18) is provided with a sliding groove that is slidably connected to the material distribution plate (6). The top of the vibration damping block (18) is detachably installed with an end cover plate (22) for sealing its hollow part.

Images