A rotor structure for a fine coal crusher

Abstract

This application discloses a rotor structure for a fine coal crusher, including a drive shaft on which multiple discs are fixedly mounted. Six to twelve hammer arms are suspended between adjacent discs, with the suspension points of adjacent hammer arms evenly spaced circumferentially. The hammer arms suspended between every two adjacent discs are arranged in a radially staggered pattern, and each hammer arm has a hammerhead fixed to its end, thus positioning each hammerhead between two adjacent hammerheads on its side in the circumferential direction. This application increases the number of impacts and the coverage area on the material within a single rotation cycle of the discs, providing a basic guarantee for achieving the required particle size. The reduced crushing distance significantly reduces the incidence of missed crushing, further ensuring particle size from a physical structure perspective, while also extending the service life of components such as the hammerheads.

Description

Technical Field

[0001] This application relates to the field of coal crushing technology, and in particular to a rotor structure for a fine coal crusher. Background Technology

[0002] Fine coal crushers (reversible hammer mills) are mainly used to crush large pieces of raw coal. Currently used fine coal crushers have four suspended hammer arms and hammers evenly distributed on each disc. However, the following technical defects still exist in the crushing process:

[0003] 1. The hammers make insufficient contact with the material per revolution of the rotor (only 4 times), resulting in fewer impacts on the material and low efficiency when processing large or high-hardness materials.

[0004] 2. Only 4 hammers are arranged on one circumference of the rotor, and the distance between the 4 hammers is 90 degrees. There is a gap in the crushing process within a single rotation cycle. Coal can easily leak through the gap between two adjacent hammers, which can easily cause coal leakage and thus result in low crushing efficiency.

[0005] 3. Since the hammers are arranged in a row from the transmission end to the non-transmission end, when the incoming material is under peak load conditions, the rotor body is prone to generate high resonance frequency, which leads to increased fatigue strength and shortened fatigue life of components such as the main shaft and bearings.

[0006] 4. When the incoming material is at its peak (≥500t / h), the feed particle size requirement is high (must be <300mm), and the uniformity of the finished product is poor, thus limiting its applicability. Summary of the Invention

[0007] To address the aforementioned problems, this application aims to provide a rotor structure for a fine coal crusher that not only enhances the crushing effect on coal but also further solves the existing coal leakage problem.

[0008] To achieve the above objectives, the technical solution adopted in this application is as follows: a fine coal crusher rotor structure, including a drive shaft, on which a plurality of discs are fixedly sleeved, and 6-12 hammer arms are suspended between two adjacent discs, with the suspension points of the adjacent hammer arms arranged at equal intervals in the circumferential direction, and the hammer arms suspended between each two adjacent discs arranged radially staggered, and each hammer arm has a hammer head fixed at its end, so that each hammer head is located between two adjacent hammer heads in the circumferential direction on the side.

[0009] Preferably, 12 hammer arms are suspended between two adjacent disks, and the included angle between adjacent hammer arms in the circumferential direction is 30°.

[0010] Preferably, 12 hammer arms are suspended between two adjacent disks, and the included angle between adjacent hammer arms in the circumferential direction is 60°.

[0011] Preferably, each hammerhead has a crushing cone tip located on one side wall in the direction of rotation and near the corner, with the tip of the crushing cone tip facing the direction of hammerhead rotation.

[0012] Preferably, an assembly screw is provided inside the hammer head, and the assembly screw penetrates the hammer head and is threadedly connected to the tip of the crushing cone.

[0013] The beneficial effects of this application are:

[0014] 1. Within a single rotation cycle of the disc, the number of impacts on the material and the coverage area are increased, providing a basic guarantee that the particle size of the crushed material meets the standards.

[0015] 2. The reduction in the crushing spacing greatly reduces the occurrence of missed crushing and, from a physical structure perspective, ensures the particle size.

[0016] 3. Within a single rotation cycle of the disc, the reaction force experienced by the hammer and other parts when striking the material is dispersed, enabling them to act continuously and stably. This greatly reduces and eliminates the impact force on the strength of the parts, significantly increasing their service life.

[0017] 4. For large, hard materials, the increased number of crushing cycles per rotation makes them easier to crush, reducing the pressure on the material's pre-processing and improving applicability, crushing efficiency, and throughput.

[0018] 5. By setting a crushing cone tip on one side of each hammer rotation direction, during the crushing process of coal, the crushing cone tip first contacts the coal under the drive of the hammer. After the cone tip with concentrated force contacts the coal, the coal can be easily crushed, thereby improving the crushing effect of the coal and extending the service life of the hammer. Attached Figure Description

[0019] Figure 1 This is a front view of the rotor structure of the fine coal crusher in this application.

[0020] Figure 2 This is a plan view of the suspended hammer arms and hammer heads arranged on a single disk in this application.

[0021] Figure 3 This is a diagram showing the staggered arrangement of the suspended hammer arms and hammer heads on adjacent discs in this application.

[0022] Figure 4 A diagram showing a crushing cone tip near the corner on one side of the hammer's rotation direction in this application.

[0023] In the diagram: 1-Drive shaft; 2-Disc; 3-Suspended hammer arm; 4-Hammer head. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] See attached document Figures 1-4 The rotor structure of a fine coal crusher shown includes a drive shaft 1, on which multiple discs 2 are fixedly mounted. Six to twelve hammer arms 3 are suspended between adjacent discs 2, with the suspension points of adjacent hammer arms 3 evenly spaced circumferentially. The hammer arms 3 suspended between each pair of adjacent discs 2 are arranged radially in a staggered manner, and each hammer arm has a hammer head 4 fixed to its end, thus positioning each hammer head 4 between two adjacent hammer heads 4 on its side circumferentially. The drive shaft 1 passes through a housing, which has a coal inlet and a coal outlet on its upper and lower sides. Arc-shaped impact plates, leaving a crushing gap with the hammer heads 4, are symmetrically arranged on the inner wall of the housing (the housing, coal inlet, coal outlet, and arc-shaped impact plates are conventional structures and are not shown in the figure). After large pieces of coal enter the housing through the coal inlet, the hammer heads 4 rotate and strike the coal blocks under the rotation of the drive shaft 1. After contacting the impact plates, the coal blocks rebound and contact the hammer heads 4 again, thus crushing the coal blocks. The gap between the impact plate and the hammer 4 can be adjusted according to the coal quality and the wear of the hammer 4 to adjust the discharge particle size curve and enhance the equipment's adaptability to different materials.

[0026] By equipping each disc 2 with 6-12 hammer arms 3 and hammer heads 4, the number of contacts between the disc 2 and the coal entering the box is increased during one rotation. This means an increase in the number of hammer heads 4 contacting the coal as it flows from the inlet to the outlet, thus improving the coal crushing effect. Simultaneously, the increased number of suspended hammer arms 3 and hammer heads 4 reduces the gap between adjacent quadrant points, effectively addressing existing coal leakage and further improving coal crushing efficiency.

[0027] Each hammerhead 4 is staggered with two adjacent hammerheads on its side. This arrangement ensures that each suspended hammer arm 3 and hammerhead 4 on a single disk 2 is located within the gap between adjacent suspended hammer arms 3 and hammerheads 4 on the adjacent disk 2. Because the disks 2 are arranged sequentially close to each other on the drive shaft 1, the staggered arrangement on adjacent disks 2 further reduces the included angle between adjacent suspended hammer arms 3 and hammerheads 4, thereby reducing the gap between adjacent suspended hammer arms 3 and hammerheads 4 and further reducing coal leakage.

[0028] Preferred, such as Figure 2As shown, twelve suspended hammer arms 3 and hammer heads 4 are equally spaced on the disc 2. This arrangement makes the included angle between adjacent suspended hammer arms 3 and hammer heads 4 30°. This included angle can effectively limit the problem of coal leakage, effectively increase the number of times the coal blocks entering the box are struck, and increase the hammering and crushing effect of the coal blocks.

[0029] For large pieces of coal, it is preferable to suspend 6 hammer arms between adjacent discs 2, and the included angle between adjacent hammer arms 3 in the circumferential direction is 60°. This structure increases the space between adjacent hammer heads 4 in the circumferential direction, so that large pieces of coal can enter and be crushed by contact with the hammer heads 4.

[0030] Because coal may contain hard impurities such as coal gangue, in order to improve the service life of hammerhead 4 and its crushing effect on coal blocks, such as Figure 4 As shown, each hammerhead 4 has a crushing cone tip 41 located on one side wall in the direction of rotation, near a corner, with the tip of the crushing cone tip 41 facing the direction of hammerhead rotation. During the rotation of the hammerhead 4, the crushing cone tip 41 on its side wall comes into pre-contact with the coal block, and the tip of the crushing cone tip 41 concentrates the hammering force on the coal block, making the coal block easier to crush, thereby improving the crushing effect of the coal block and extending the service life of the hammerhead 4.

[0031] To address the issue of the crushing cone tip 41 becoming blunt after prolonged contact with coal, thus reducing the crushing effect, it is preferable to insert a screw (not shown in the figure, preferably a countersunk screw) inside the hammer head 4. After penetrating the hammer head 4, the screw connects to the crushing cone tip 41, enabling the replacement of the crushing cone tip 41 and avoiding the increased cost of replacing the crushing cone tip and hammer head 4 as a whole.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope of protection, and all such changes and modifications fall within the scope of protection claimed by this utility model.

Claims

1. A coal pulverizer rotor construction comprising a drive shaft having a plurality of disks fixedly mounted thereon, characterized by: Six to twelve hammer arms are suspended between two adjacent disks, and the suspension points of the adjacent hammer arms are arranged at equal intervals in the circumferential direction. The hammer arms suspended between each pair of adjacent disks are arranged in a radially staggered manner, and a hammer head is fixed at the end of each hammer arm, so that each hammer head is located between two adjacent hammer heads in the circumferential direction on the side.

2. The coal pulverizer rotor construction of claim 1 wherein: Twelve hammer arms are suspended between two adjacent disks, and the included angle between adjacent hammer arms in the circumferential direction is 30°.

3. The coal pulverizer rotor construction of claim 1 wherein: Twelve hammer arms are suspended between two adjacent disks, and the included angle between adjacent hammer arms in the circumferential direction is 60°.

4. The coal pulveriser rotor construction as claimed in claim 2 or 3, wherein: Each hammerhead has a crushing cone tip located on one side wall in the direction of rotation and near the corner, with the tip of the crushing cone tip facing the direction of hammerhead rotation.

5. The coal pulverizer rotor construction of claim 4 wherein: An assembly screw is inserted inside the hammer head, and the assembly screw penetrates the hammer head and is threadedly connected to the tip of the crushing cone.

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