A needle bar type pulverizer capable of adjusting a particle size distribution of a material

Abstract

The utility model relates to a needle bar type rubbing crusher that can adjust material granularity distribution belongs to rubbing equipment technical field, include: rubbing crusher body, rubbing chamber, temporary storage warehouse, rubbing crusher casing, connecting piece, fastener, needle bar, stator tooth disc, rotor tooth disc, rotor disc, main shaft, the needle bar is fixedly connected with stator tooth disc and rotor tooth disc respectively, the needle bar is all annular arrangement on stator tooth disc and rotor tooth disc, and the needle bar on rotor tooth disc and stator tooth disc is alternately buckled, and the needle bar forest is formed, and the needle bar is detachable installation. Rotor tooth disc and stator tooth disc are block design, detachable installation, and the scheme can control the granularity distribution of material after rubbing in a certain range through adjusting the number of needle bar, make the granularity distribution of material after rubbing more concentrated, expand the application range of needle bar type rubbing crusher, and the adaptability is better.

Description

Technical Field

[0001] This utility model relates to the field of crushing equipment technology, and in particular to a needle-bar crusher that can adjust the particle size distribution of materials. Background Technology

[0002] Conventional needle-bar pulverizers have the problem of poor applicability to materials with different properties. For example, if the material before pulverization is agglomerated or its geometric diameter is larger than the gap between the rotor and stator of the needle-bar pulverizer, the material cannot enter the pulverization chamber quickly. For brittle materials, the proportion of fine powder after pulverization is too high and the particle size distribution is not concentrated.

[0003] Extrusion granulation technology is widely used in pharmaceuticals, food, and chemical industries. The particle size, moisture content, and flowability of the raw materials used in extrusion granulation significantly affect the granulation effect. Pretreatment of the raw materials, such as crushing and drying, is often necessary. Extrusion granulation technology generally requires the particle size of the raw material powder to be between tens and hundreds of micrometers. If the raw material particle size is too coarse, it may result in irregular particle shapes and uneven sizes, and may generate excessive pressure during extrusion, damaging the equipment. If the particle size is too fine, the material's flowability will decrease, making it prone to agglomeration and hindering extrusion molding. It may also result in overly compacted particles, affecting subsequent drying and dissolving properties. Therefore, extrusion granulation technology requires a concentrated raw material particle size; both excessively coarse and excessively fine particles will negatively impact the quality of the granulated particles.

[0004] The needle-bar pulverizer primarily utilizes the powerful impact, shearing, and friction forces generated between the high-speed rotating needle bar and the fixed toothed ring to pulverize materials. The particle size of the pulverized material is generally controlled by adjusting the feed rate and the frequency of the pulverizer's main unit. However, for highly brittle materials, if the pulverizer's main unit frequency is set too low, the pulverized material will have excessively coarse particles, affecting the quality of subsequent granulation. Conversely, if the pulverizer's main unit frequency is set too high, the pulverized material will have excessively fine particles, also affecting the quality of subsequent granulation and leading to higher energy consumption. Utility Model Content

[0005] To address the aforementioned problems, the present invention aims to provide a needle-bar pulverizer that can adjust the particle size distribution of materials. The structural design of this pulverizer can effectively solve the problems of poor material applicability and non-concentrated particle size distribution in existing pulverizers.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A needle-bar type pulverizer with adjustable particle size distribution is characterized by comprising: a pulverizer body, a pulverizing chamber, a temporary storage bin, a pulverizer housing, connecting parts, fasteners, needle bars, a stator toothed disc, a rotor toothed disc, a rotor disc, and a main shaft.

[0008] The pulverizer body is located on the temporary storage chamber. The pulverizing chamber is a cavity within the pulverizer body. The rotor toothed disc and rotor disk are located inside the pulverizing chamber and are fixedly connected by fasteners. The rotor disk is fixedly connected to the main shaft. The stator toothed disc is fixedly connected to the pulverizer housing. The pulverizer housing and the pulverizer body are rotatably fixed by a connector. The needle bars are fixedly connected to the stator toothed disc and the rotor toothed disc respectively. The needle bars are arranged in a ring on both the stator toothed disc and the rotor toothed disc. The needle bars on the rotor toothed disc and the stator toothed disc are alternately interlocked to form a needle bar forest. The needle bars are detachably installed.

[0009] Furthermore, the crusher casing is hinged to the crusher body.

[0010] Furthermore, the needle bar is fixedly mounted on the stator gear plate and the rotor gear plate by self-tapping threads or nuts.

[0011] Furthermore, the rotor gear disk and stator gear disk are designed in sections and can be detached and installed.

[0012] Furthermore, the fasteners are fastening bolts and fastening cover plates, and the fasteners are designed coaxially with the rotor disk and the main shaft. The fastening bolts and fastening cover plates are installed on the rotor disk.

[0013] Furthermore, the shape of the needle bar is cylindrical or equilateral hexagonal prism.

[0014] Furthermore, the crushing chamber is a jacketed design, and cooling water flows through the jacket.

[0015] Furthermore, the spindle has a jacket design, and cooling water flows through the jacket.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This invention provides a needle-bar pulverizer that can control the particle size of the pulverized material. By reducing the number of needle bars on the rotor and stator toothed discs and increasing the gap between the needle bars, the material can enter the pulverizing chamber more quickly. Furthermore, the rotor and stator toothed discs are detachable, allowing the needle bars on either the geometrically symmetrical rotor or stator toothed discs to be removed in pairs according to the required particle size after pulverization.

[0018] The particle size distribution of the pulverized material is related to the shearing and impact forces and frequency experienced by the material in the pulverizing chamber. Based on the characteristics and difficulty of pulverization, the particle size distribution can be controlled within a certain range by adjusting the number of needle bars on the rotor or stator gear plate. This results in a more concentrated particle size distribution, reducing the proportion of fine powder and coarse particles, and improving the quality of the granulated particles. Furthermore, rationally designing the number of needle bars for different pulverization requirements can expand the applicability of the needle bar pulverizer. When pulverizing materials to a very fine particle size, increasing the number of needle bars can improve pulverization efficiency, allowing the material to undergo more thorough impact and grinding in the pulverizing chamber, thereby achieving the required fineness faster and reducing energy consumption. If the fineness requirement is not high, reducing the number of needle bars can reduce over-pulverization of the material while ensuring that coarse crushing requirements are met, reducing the equipment's operating load and achieving energy savings. The pulverization accuracy was optimized by adjusting the host frequency. By combining the host frequency with the number of needle bars, the pulverization precision was improved, balancing machine energy consumption and pulverization requirements. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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.

[0020] Figure 1 This is a schematic diagram of the needle-bar pulverizer of this utility model. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the needle-bar pulverizer of this utility model. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the pulverizing chamber of this utility model.

[0023] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0024] Figure 5 This is a schematic diagram of the combination of the rotor tooth disk and the rotor disk of this utility model.

[0025] Figure 6 This is a schematic diagram of the cross-section of the spindle sleeve of this utility model.

[0026] In the diagram: 1-Air blower, 2-Feed inlet, 3-Motor, 4-Temporary storage bin, 5-Discharge outlet, 6-Rotor gear disc, 7-Stator gear disc, 8-Crusher housing, 9-Main shaft, 10-Belt, 11-Protective cover, 12-Hinge, 13-Fastening bolt, 14-Fastening cover plate, 15-Needle bar, 16-Crushing chamber, 17-Cooling water jacket, 18-Crusher body, 19-Fastening handwheel, 20-Rotor disc Detailed Implementation

[0027] The present invention will now be described in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0028] The technical solution of this utility model includes: a crusher body, a crushing chamber, a temporary storage bin, a crusher housing, connecting parts, fasteners, a pin bar, a stator gear plate, a rotor gear plate, a rotor disk, and a main shaft.

[0029] like Figure 1-2 As shown, the pulverizer body 18 is located on the temporary storage chamber 4, the pulverizing chamber 16 is a cavity in the pulverizer body 18, the rotor toothed disc 6 and the rotor disc 20 are located inside the pulverizing chamber 16 and are fixedly connected by fasteners, the rotor disc 20 is fixedly connected to the main shaft 9, the stator toothed disc 7 is fixedly connected to the pulverizer housing 8, the pulverizer housing 8 and the pulverizer body 18 are rotatably fixed by connectors, the needle bars 15 are fixedly connected to the stator toothed disc 7 and the rotor toothed disc 6 respectively, the needle bars 15 are arranged in a ring on both the stator toothed disc 7 and the rotor toothed disc 6, the needle bars 15 on the rotor toothed disc 6 and the stator toothed disc 7 are alternately interlocked to form a needle bar forest, the needle bars 15 are detachably installed.

[0030] Since the rotor and stator gear disks are often disassembled in pairs, the term "gear disk" will be used to generally refer to both the stator and rotor gear disks in the following explanation.

[0031] For materials with high hardness, increasing the number of pins can enhance the crushing force, allowing the material to reach the required fineness in a shorter time and reducing the energy consumption of repeated crushing. For example, when crushing hard minerals such as quartz, multiple pins can work simultaneously to improve crushing efficiency.

[0032] Sticky materials tend to adhere to the needle rods and the walls of the grinding chamber, affecting the grinding effect and efficiency. Reducing the number of needle rods and toothed discs prevents excessive material adhesion and overloading of the needle rods, resulting in more efficient grinding and reduced energy consumption.

[0033] like Figure 2 As shown, the crusher housing 8 is hinged to the crusher body 18, and the two ends of the hinge 12 are respectively located on the crusher body 18 and the crusher housing 8, thereby realizing the opening and closing function of the crushing chamber.

[0034] like Figure 3 As shown, the needle bar 15 is mounted on the stator gear plate 7 and the rotor gear plate 6 by self-tapping threads, or is fixed on the rotor gear plate 7 and the stator gear plate 6 by using nuts.

[0035] Self-tapping threads: pre-machine the threaded holes on the stator gear plate 7 and the rotor gear plate 6 to ensure that the thread specification of the pin bar 15 matches the threaded holes on the stator gear plate and the rotor gear plate.

[0036] Nut fixing: The nut is installed on the rear side of the stator gear plate 7 and the rotor gear plate 6, and matches the screw part of the needle bar 15.

[0037] like Figure 5 As shown, the modular design is a circumferentially divided design. The gear disc is specifically composed of eight triangular cubes. Each triangular cube has a notch at its vertices, and these notches form holes for fasteners, further improving the stability of the assembly. Bolts are used to secure the gear discs to the rotor discs and the crusher housing via bolt holes on the top of the gear discs. When disassembly and reassembly are required, simply unscrewing the bolts on the corresponding gear discs completes the assembly, improving production efficiency.

[0038] Furthermore, the segmented design can also be a concentric circle design, with the center located at the center of the toothed disc. The toothed disc is circular in shape, and the needle bars are distributed on each toothed disc in a circumferential array. The diameter of the toothed disc gradually increases from the center outwards.

[0039] like Figure 4 As shown, the fasteners are fastening bolts 13 and fastening cover plates 14. The fasteners are coaxially designed with respect to the rotor disk 20 and the main shaft 9. The fastening bolts 13 and fastening cover plates 14 are installed on the rotor gear disk 6. The main shaft 9 is fixedly connected to the rotor disk as a drive shaft. The rotation of the main shaft drives the rotor gear disk to rotate.

[0040] Furthermore, the needle rod 15 is cylindrical or equilateral hexagonal prism. When the needle rod is cylindrical, it is suitable for brittle materials with high crushability; when it is equilateral hexagonal prism, it is suitable for materials with poor crushability and high hardness.

[0041] Furthermore, the crushing chamber 15 is a jacketed design, and cooling water flows through the jacket.

[0042] Furthermore, the spindle 9 is a jacketed design, and cooling water flows through the jacket.

[0043] like Figure 6As shown, the explanation of the jacket design is as follows: Taking the main shaft as an example, the jacket is an outer structure surrounding the main shaft, specifically composed of the main shaft and the outer jacket. A certain gap exists between the main shaft and the outer jacket, forming an independent fluid circulation space. Cooling water can be added to this gap, and the circulating flow of the cooling water achieves a cooling effect, effectively preventing the main shaft temperature from continuously rising under heavy crushing loads. Similarly, when crushing heat-sensitive materials, a jacket design is required for the crushing chamber. An outer structure is added to the outside of the crusher body, with a gap between the crusher body and the added outer structure. Cooling water is added to this gap, effectively preventing material adhesion and blockage, and improving production safety and stability.

[0044] When the needle-bar pulverizer is working, the motor 3 drives the main shaft to rotate via the belt 10. The protective cover 11 covers the belt 10 in a space that is not easily accessible to personnel, ensuring personnel safety. During pulverization, the material feeds through the feed inlet 2 into the pulverizing chamber 16, controlled by the airlock 1, and is fixed to the temporary storage bin 4. The pulverizer housing 8 is rotatably fixed to the pulverizing chamber 16 via the hinge 12. The outer edge of the pulverizer housing 8 is designed with a sealing strip to ensure airtightness. The pulverizer housing 8 is sealed to the pulverizing chamber 16 by the fastening handwheel 19. Needle bars 15 are installed on the stator gear plate 7 and the rotor gear plate 6 via self-tapping threads. The rotor gear plate 6 is fixed to the main shaft 9 by the fastening bolts 13 and the fastening cover plate 14. The pulverized material enters the temporary storage bin 4 through the discharge port 5 for use in subsequent processes.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A needle-bar pulverizer capable of adjusting the particle size distribution of materials, characterized in that, include: Crusher body, crushing chamber, temporary storage bin, crusher housing, connecting parts, fasteners, pin bar, stator gear plate, rotor gear plate, rotor disc, main shaft; The pulverizer body is mounted on the temporary storage chamber. The pulverizing chamber is a cavity within the pulverizer body. The rotor toothed disc and rotor disk are located inside the pulverizing chamber and are fixedly connected by fasteners. The rotor disk is fixedly connected to the main shaft. The stator toothed disc is fixedly connected to the pulverizer housing. The pulverizer housing and the pulverizer body are rotatably fixed by a connector. The needle bars are fixedly connected to the stator toothed disc and the rotor toothed disc respectively. The needle bars are arranged in a ring on both the stator toothed disc and the rotor toothed disc. The needle bars on the rotor toothed disc and the stator toothed disc are alternately interlocked to form a needle bar forest. The needle bars are detachably installed.

2. The needle-bar pulverizer with adjustable particle size distribution according to claim 1, characterized in that, The crusher casing is hinged to the crusher body.

3. A needle-bar pulverizer with adjustable particle size distribution according to claim 1, characterized in that, The needle bar is fixedly mounted on the stator and rotor gear plates by self-tapping threads or nuts.

4. A needle-bar pulverizer with adjustable particle size distribution according to claim 1, characterized in that, The rotor and stator gear disks are designed in sections and can be disassembled and installed.

5. A needle-bar pulverizer with adjustable particle size distribution according to claim 1, characterized in that, The fasteners are fastening bolts and fastening cover plates. The fasteners are designed coaxially with the rotor disk and the main shaft. The fastening bolts and fastening cover plates are installed on the rotor disk.

6. A needle-bar pulverizer with adjustable particle size distribution according to claim 1, characterized in that, The needle bar is cylindrical or an equilateral hexagonal prism.

7. A needle-bar pulverizer with adjustable particle size distribution according to claim 1, characterized in that, The crushing chamber is a jacketed design, and cooling water flows through the jacket.

8. A needle-bar pulverizer with adjustable particle size distribution according to claim 1, characterized in that, The spindle has a jacket design, and cooling water flows through the jacket.

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