Granite multi-stage homogeneous crushing device and process thereof

Abstract

The invention relates to the technical field of granite crushing, in particular to a granite multi-stage homogeneous crushing device and a granite multi-stage homogeneous crushing process. The crushing device further comprises a crushing assembly, an airflow screening area and a screening plate. The multiple crushing assemblies are arranged in the shell in the vertical direction, each crushing assembly comprises two horizontally-arranged crushing rollers, and a gap allowing granite to pass through is formed between the two crushing rollers. The multiple airflow screening areas are arranged between every two adjacent crushing assemblies, and during crushing, airflow flowing in the horizontal direction is generated in the airflow screening areas all the time; the screening plate is obliquely arranged below the airflow screening area. According to the invention, the crushing homogenization degree and the operation continuity are improved.

Description

Technical Field

[0001] This invention relates to the field of granite crushing technology, specifically to a multi-stage homogeneous crushing device and process for granite. Background Technology

[0002] Granite is quite hard, and due to practical needs in many fields, it needs to be made into sand and gravel. In the production process, a granite sand making machine is required. During sand making, the granite needs to be crushed and screened multiple times, and the sand making process can only be completed after multiple cycles. Therefore, the sand making efficiency is limited.

[0003] Chinese Patent Publication No. CN212975431U discloses a granite crushing device, including a top box and a bottom box. The top box is fixed to the top outer wall of the bottom box, and symmetrically distributed support columns are provided on both sides of the bottom box's outer wall. A conveyor belt is provided at the bottom of the bottom box. A second drive shaft is provided on one side of the bottom box's outer wall, and a first roller is provided on the circumferential outer wall of the second drive shaft. One end of the second drive shaft is connected to a second motor via a coupling. Near the second drive shaft, on one side of the bottom box's outer wall... There is a drive shaft three, and a roller two is provided on the outer circumference of the drive shaft three, and a motor three is connected to one end of the drive shaft three through a coupling; filter plates are slidably connected to the inner walls of both sides of the bottom box near the bottom, and the top outer wall of the filter plate has evenly distributed through holes, and a handle is provided on the outer wall of the filter plate away from the bottom box; a fixed jaw plate is provided on one inner wall of the top box, and an adjusting seat is provided on the inner wall of the top box away from the fixed jaw plate, and a movable jaw pull rod is provided on the outer wall of the adjusting seat near the fixed jaw plate.

[0004] The above solution uses a screen sieving method for screening. During the screening process, the granite fragments intercepted by the screen remain on the screen and cannot be recycled to the crushing device for secondary crushing. The particle size of the crushed granite is between 0.15-5mm. In special scenarios, the particle size needs to be even smaller, between 0.075-0.15mm. However, the existing crushing process will generate some extremely fine granite particles with a particle size between 0.075-0.15mm, which will spread everywhere during crushing, causing environmental pollution and wasting extremely fine granite particles. Summary of the Invention

[0005] To address the aforementioned issues, a multi-stage homogeneous crushing device and process for granite are provided. This device employs multiple crushing components arranged vertically with gradually decreasing gaps between the crushing rollers from top to bottom. Combined with a screening plate inclined between adjacent crushing components, a tiered crushing and circulating screening mechanism is constructed, effectively solving the problem of missing screening and crushing circulation in traditional crushing methods. Unqualified coarse particles intercepted by the screening plate are guided by the inclined structure to fall into the next layer of crushing components for secondary crushing, avoiding debris accumulation that clogs the filter screen and reduces screening efficiency. Simultaneously, it achieves gradual refinement of granite from large sizes to standard particle sizes, ultimately producing stable particle sizes that meet the requirements of specific application scenarios.

[0006] To address the problems of existing technologies, the present invention provides a multi-stage homogeneous crushing device for granite, including a shell;

[0007] The crushing device also includes crushing components, an airflow screening zone, and a screening plate;

[0008] Multiple crushing components are arranged vertically inside the housing. Each crushing component includes two horizontally arranged crushing rollers with a gap between them for the granite to pass through.

[0009] Multiple airflow screening zones are set between two adjacent crushing components. During crushing, airflow is always generated in the airflow screening zone in a horizontal direction.

[0010] The screening plate is tilted and positioned below the airflow screening zone.

[0011] Preferably, the crushing components are arranged from top to bottom, and the gap between the two crushing rollers in each crushing component gradually decreases.

[0012] Preferably, the outer casing is also provided with an air blowing channel, an exhaust channel, and a cloth bag collector;

[0013] An air blowing channel is located on one side of the airflow screening area and is connected to the airflow screening area. A fan is installed on the air blowing channel, and the fan blows outside air horizontally into the airflow screening area through the air blowing channel.

[0014] The exhaust chute is located on the other side of the airflow screening zone along the air outlet direction of the blowing chute and is connected to the airflow screening zone;

[0015] The bag collector is located on one side of the housing and is connected to the exhaust duct.

[0016] Preferably, a flow divider is provided at the connection between the air blowing channel and the airflow screening area, and multiple air outlets are vertically arranged on the flow divider, allowing the fan to communicate with the flow divider.

[0017] Preferably, the bottom of the exhaust trough slopes downward toward the airflow screening area.

[0018] Preferably, a collection bin is provided below the screening plate, the bottom of the collection bin has an inclined structure, and a guide pipe is provided on the lower side of the collection bin, the lower end of the guide pipe is connected to the lower side wall of the outer shell.

[0019] Preferably, the upper part of the outer shell is closed, and a feeding unit is provided on the side wall of the outer shell. The feeding unit includes a transport block and a transport trough.

[0020] The carrier block is horizontally movable and positioned on one side of the outer casing and can extend into the interior of the outer casing;

[0021] The transport trough is vertically cut through the transport block and is used to store granite.

[0022] Preferably, a fan is provided at the upper part of the outer casing, and the fan is located directly above the transport trough when the transport trough extends into the outer casing for feeding.

[0023] Preferably, an inclined guide plate is provided on the upper part of the crushing assembly, with the lower end of the guide plate facing the gap between the two crushing rollers.

[0024] This invention also relates to a multi-stage homogeneous crushing process for granite, employing a multi-stage homogeneous crushing device for granite, the specific steps of which are as follows:

[0025] S1. Initial crushing: The granite is thrown into the outer shell and crushed by the uppermost crushing component before falling.

[0026] S2. Screening of extremely fine granite particles: The falling granite particles pass through the airflow screening zone, and the extremely fine granite particles are blown out of the airflow screening zone and collected.

[0027] S3. Ordinary granite particle screening: Granite particles that have passed through the airflow screening zone fall onto the screening plate for screening. Granite particles that pass through the screening plate are guided to the bottom of the shell. The intercepted granite particles fall into the second-stage crushing component for secondary crushing under the guidance of the screening plate. This process is repeated until the particles fall to the bottom of the shell.

[0028] The advantages of this invention compared to the prior art are:

[0029] 1. This invention employs multiple crushing components arranged vertically with gradually decreasing gaps between crushing rollers from top to bottom, combined with a screening plate inclined between adjacent crushing components, to construct a graded crushing and circulating screening mechanism. This effectively solves the problem of missing screening and crushing circulation in traditional crushing. Substandard coarse particles intercepted by the screening plate can fall into the next layer of crushing components for secondary crushing under the guidance of the inclined structure, avoiding debris accumulation that clogs the filter screen and reduces screening efficiency. Simultaneously, it achieves gradual refinement of granite from large sizes to standard particle sizes, ultimately producing stable particle sizes that meet the needs of specific scenarios, improving the homogenization of crushing and the continuity of operations.

[0030] 2. By setting up an airflow screening zone between adjacent crushing components, and combining it with an airflow collection system consisting of a blower, air blowing channel, exhaust channel, and bag filter, extremely fine granite particles with a diameter of less than 0.15mm are precisely separated using a horizontal airflow of 4m / s. The airflow blows the extremely fine particles to the exhaust channel, where they are then collected by the bag filter. This avoids the problem of extremely fine particles scattering and polluting the air, endangering the health of operators, and also reduces the waste of raw materials caused by the inability to collect the required extremely fine particles. At the same time, it prevents fine particles from seeping into the equipment's transmission components and accelerating wear, thus extending the equipment's service life and achieving both environmental protection and economic efficiency.

[0031] 3. By designing the airflow screening zone as multiple single-unit structures arranged horizontally, and installing a distributor with multiple vertical air outlets at the connection between the air blowing channel and the airflow screening zone, the airflow utilization efficiency is significantly optimized. The smaller size of the single-unit airflow screening zone effectively avoids the problem of insufficient flow velocity caused by airflow spillage in a monolithic structure. The multi-outlet design of the distributor ensures that a continuous horizontal airflow is generated throughout the entire vertical surface of the airflow screening zone, further improving the separation effect of extremely fine particles. Combined with the inclined exhaust channel at the bottom, it can promptly discharge any accidentally entered ordinary granite particles, ensuring the stable and efficient operation of the overall crushing and screening process of the device. Attached Figure Description

[0032] Figure 1 This is a three-dimensional schematic diagram of a multi-stage homogeneous crushing device for granite according to the present invention.

[0033] Figure 2 This is a side view of a multi-stage homogeneous crushing device for granite according to the present invention.

[0034] Figure 3 This invention relates to a multi-stage homogeneous crushing device for granite. Figure 2 Schematic diagram of cross-section at point AA.

[0035] Figure 4 This invention relates to a multi-stage homogeneous crushing device for granite. Figure 3 A magnified view of a portion of point B in the middle.

[0036] Figure 5 This is a cross-sectional three-dimensional schematic diagram of a multi-stage homogeneous crushing device for granite according to the present invention.

[0037] Figure 6 This invention relates to a multi-stage homogeneous crushing device for granite. Figure 5 A magnified view of a portion of point C.

[0038] Figure 7 This invention relates to a multi-stage homogeneous crushing device for granite. Figure 5 A magnified view of a portion of point D.

[0039] Figure 8 This is a three-dimensional schematic diagram of a multi-stage homogeneous crushing device for granite according to the present invention after the outer shell has been removed.

[0040] Figure 9 This is a three-dimensional schematic diagram of a multi-stage homogeneous crushing device for granite according to the present invention, with the outer shell and feeding device removed.

[0041] The diagram is labeled as follows: 1. Outer shell; 11. Crushing roller; 111. Rotary drive; 12. Airflow screening zone; 121. Air blowing channel; 1211. Fan; 1212. Diverter; 1213. Air outlet; 122. Exhaust channel; 123. Collection bin; 124. Guide pipe; 13. Screening plate; 2. Feeding unit; 21. Carrier block; 22. Carrier trough; 23. Conveying shell; 24. Linear drive; 3. Fan; 4. Guide plate. Detailed Implementation

[0042] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0043] Reference Figures 1-3 A multi-stage homogeneous crushing device for granite, comprising a shell 1;

[0044] The crushing device also includes a crushing assembly, an airflow screening zone 12, and a screening plate 13;

[0045] Multiple crushing components are arranged vertically inside the housing 1. Each crushing component includes two horizontally arranged crushing rollers 11, with a gap between the two crushing rollers 11 for the granite to pass through.

[0046] Multiple airflow screening zones 12 are arranged between two adjacent crushing components. During crushing, airflow flowing in the horizontal direction is always generated in the airflow screening zone 12.

[0047] The screening plate 13 is inclined and positioned below the airflow screening zone 12.

[0048] In existing technologies, there are two major problems when screening crushed granite: First, there is a lack of a recycling mechanism between screening and crushing. Granite fragments intercepted by the filter screen will always accumulate on the screen, which not only easily causes the filter screen to become clogged and reduces the efficiency of subsequent screening, but also cannot be recycled to the upstream crushing component of the crushing device for secondary crushing. As a result, some substandard coarse particles cannot be further refined, making it difficult to meet the precise requirements for granite particle size in special scenarios. Furthermore, the granite particles produced by existing crushing processes are mostly concentrated between 0.15-5mm in size. However, in special scenarios such as precision building material processing and high-end decorative materials, finer granite particles are often required, typically between 0.075-0.15mm. The single-stage or simple multi-stage crushing structures of existing equipment are unable to stably achieve batch production of this fine particle size. Specialized screening mechanisms are needed to obtain granite particles with a particle size between 0.075-0.15mm. Secondly, the collection and protection of extremely fine particles are insufficient. Although some extremely fine granite particles with a particle size between 0.075-0.15mm are generated during the existing crushing process, the lack of targeted airflow guidance and collection structures inside the crushing chamber allows these extremely fine particles to spread throughout the crushing operation. On the one hand, this pollutes the workshop air environment and endangers the respiratory health of operators. On the other hand, it also leads to the waste of these extremely fine particles that meet the requirements of special scenarios due to the inability to collect them effectively, increasing raw material loss costs. At the same time, the scattered extremely fine particles may also seep into the gaps of the equipment's transmission components, accelerating component wear and shortening the equipment's service life.

[0049] To avoid the above situation, the existing crushing device was optimized by combining graded crushing and graded screening to meet the requirements of homogeneous crushing of granite. The screening plate 13 intercepts the crushed granite and guides the intercepted granite to the next crushing component for further crushing, ultimately ensuring that the screened granite particles meet the standard size. Furthermore, extremely fine granite particles can be collected during the crushing process, preventing them from scattering. The specific structure and working process of this invention are as follows:

[0050] A rotary driver 111 is provided at one end of each crushing roller 11. The rotary driver 111 is used to drive the crushing roller 11 to rotate. The rotary driver 111 is preferably a heavy-duty motor. During crushing, granite is fed into the outer casing 1. The granite first enters the uppermost crushing assembly. The two crushing rollers 11 in the crushing assembly crush the falling granite. The crushed granite falls into the airflow screening zone 12 below the crushing assembly. During the crushing process, there is always a horizontal airflow in the airflow screening zone 12, and the airflow velocity is 4 m / s. When the airflow is 4 m / s, granite particles smaller than 0.15 mm will be blown away from the airflow screening zone 12 by the airflow. The blown-away granite particles smaller than 0.15 mm are collected. In this paper, granite particles smaller than 0.15 mm are referred to as ultra-fine granite particles. This avoids the ultra-fine granite particles from scattering everywhere and allows for the reasonable collection of ultra-fine granite particles. In addition, multiple airflow screening zones 12 are set between two adjacent crushing components. The airflow screening zones 12 are arranged horizontally. Compared with connecting multiple airflow screening zones 12 to form a whole, multiple individual airflow screening zones 12, due to their smaller size, can better avoid the phenomenon of horizontal airflow overflow within them. That is, due to excessive space, the airflow velocity after blowing out is insufficient, resulting in some extremely fine granite not being blown away from the airflow screening zone 12. When the crushed granite particles pass through the airflow screening zone 12, they fall onto the screening plate 13. The screening plate 13 screens out the granite particles that meet the production standards and conveys them to the bottom of the outer shell 1 for storage. Larger granite particles intercepted by the screening plate 13 are guided by the screening plate 13 to fall into the next crushing component for further crushing, and the cycle is repeated until the granite passes through the last crushing component and can fall smoothly into the bottom of the outer shell 1 for storage, thus realizing multi-stage homogeneous crushing of granite.

[0051] By employing multiple vertically arranged crushing components, combined with an airflow screening zone 12 and an inclined screening plate 13 positioned between adjacent crushing components, a structure combining graded crushing and graded screening is formed. This device achieves multi-stage homogeneous crushing of granite. The airflow screening zone 12 efficiently separates and collects extremely fine granite particles smaller than 0.15 mm using a horizontal airflow of 4 m / s, preventing them from scattering and polluting the environment and causing waste. The screening plate 13 guides substandard granite particles to the next layer of crushing components for secondary crushing, solving the problems of debris accumulation and blockage, and the inability to circulate crushing in traditional screening. Ultimately, it stably produces granite particles that meet the standard particle size. At the same time, by reducing the size of the airflow screening zone 12 and setting multiple zones, airflow spillage is reduced, ensuring the efficiency of fine particle separation and improving the continuity and economy of the overall crushing operation.

[0052] Reference Figure 3 The crushing components are arranged from top to bottom, and the gap between the two crushing rollers 11 in each crushing component gradually decreases.

[0053] Because the granite particles initially fed into the crushing unit are relatively large, if the gap between the two crushing rollers 11 in the uppermost crushing assembly is adjusted to match the size of the standard granite particles produced, the larger granite particles will not be able to be crushed by the two crushing rollers 11, causing the granite to accumulate between the two crushing rollers 11, resulting in a large amount of granite not being crushed smoothly. However, by arranging the crushing assemblies from top to bottom, the gap between the two crushing rollers 11 in each crushing assembly gradually decreases, achieving graded crushing of the granite and improving crushing efficiency.

[0054] Reference Figure 3 and Figure 4 The outer casing 1 is also equipped with an air blowing channel 121, an exhaust channel 122 and a cloth bag collector;

[0055] An air blowing channel 121 is located on one side of the airflow screening area 12 and is connected to the airflow screening area 12. A fan 1211 is installed on the air blowing channel 121, and the fan 1211 blows outside air horizontally into the airflow screening area 12 through the air blowing channel 121.

[0056] The exhaust trough 122 is located on the other side of the airflow screening area 12 along the air outlet direction of the blowing trough 121 and is connected to the airflow screening area 12.

[0057] The bag collector is located on one side of the housing 1 and is connected to the exhaust duct 122.

[0058] The blower 1211 horizontally blows external airflow into the airflow screening zone 12 through the air blowing channel 121. The blown air is discharged through the exhaust channel 122, forming a horizontal airflow within the airflow screening zone 12. When crushed granite particles fall into the airflow screening zone 12, the horizontal airflow blows granite particles with a diameter less than 0.15mm from the airflow screening zone 12 towards the exhaust channel 122, where they are guided into the bag filter for collection. In actual use, an exhaust fan can be installed on the exhaust channel 122 as needed to assist the blower 1211 in forming a horizontal airflow within the airflow screening zone 12.

[0059] Reference Figure 6 A flow divider 1212 is provided at the connection between the air blowing channel 121 and the airflow screening area 12. Multiple air outlets 1213 are vertically arranged on the flow divider 1212, and the fan 1211 communicates with the flow divider 1212.

[0060] The airflow blown out by the blower 1211 is diverted by the distributor 1212 and discharged from the vertically arranged air outlet 1213, ensuring that a continuous horizontal airflow can be generated on the entire vertical surface of the airflow screening zone 12, thereby improving the screening effect of extremely fine granite particles.

[0061] Reference Figure 4 and Figure 6 The bottom of the exhaust duct 122 slopes downward toward the airflow screening area 12.

[0062] When screening granite particles with a diameter of less than 0.15 mm by airflow, some granite particles with a diameter greater than 0.15 mm will inevitably be blown into the exhaust trough 122. The bottom of the exhaust trough 122 is set to be inclined downward to ensure that granite particles with a diameter greater than 0.15 mm that are accidentally blown into the exhaust trough 122 can be discharged and fall off by themselves, avoiding the accumulation at the bottom of the exhaust trough 122.

[0063] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6 A collection bin 123 is provided below the screening plate 13. The bottom of the collection bin 123 is inclined. A guide pipe 124 is provided on the lower side of the collection bin 123. The lower end of the guide pipe 124 is connected to the lower side wall of the outer shell 1.

[0064] After screening, the granite particles fall into the collection bin 123 and are guided by the collection bin 123 into the feed pipe 124, and finally fall into the bottom of the outer shell 1 for storage.

[0065] Reference Figures 1-3 , Figure 5 and Figure 7 The upper part of the outer shell 1 is closed, and a feeding unit 2 is provided on the side wall of the outer shell 1. The feeding unit 2 includes a transport block 21 and a transport trough 22.

[0066] The carrier block 21 is horizontally movable and positioned on one side of the outer casing 1 and can extend into the interior of the outer casing 1;

[0067] The transport trough 22 is vertically opened through the transport block 21 and is used to store granite.

[0068] The feeding unit 2 also includes a conveying shell 23 and a linear driver 24. The conveying shell 23 is horizontally fixed on the side wall of the outer shell 1 and communicates with the outer shell 1. The carrier block 21 is slidably disposed on the conveying shell 23 along the extension direction of the conveying shell 23. A linear driver 24 is horizontally disposed at the end of the conveying shell 23. The linear driver 24 is used to drive the carrier block 21 to move. A feeding port is provided at the upper part of the conveying shell 23. When crushing is required, the linear actuator 24 drives the carrier block 21 to move and position the carrier trough 22 directly below the feed inlet. After a certain amount of granite to be crushed is fed into the feed inlet, it is received by the carrier trough 22. Then, the linear actuator 24 drives the carrier block 21 to move, eventually causing the carrier block 21 to extend into the outer shell 1. When the carrier trough 22 on the carrier block 21 is fully extended into the outer shell 1, all the granite in the carrier trough 22 falls into the outer shell 1. The end of the carrier block 21 away from the outer shell 1 is still inside the conveying shell 23, ensuring that when feeding material into the outer shell 1, there will be no extremely fine granite particles scattered everywhere.

[0069] Reference Figure 1 and Figure 7 A fan 3 is provided on the upper part of the outer casing 1. When the conveying trough 22 extends into the outer casing 1 to feed materials, the fan 3 is located directly above the conveying trough 22.

[0070] By installing a fan 3 on the upper part of the outer casing 1, it is ensured that when the granite is fed into the transport trough 22, the dust generated when the granite falls onto the crushing component and the extremely fine granite particles generated during crushing cannot spread to the transport trough 22. This ensures that when the linear drive 24 drives the transport block 21 to withdraw from the outer casing 1, no extremely fine granite particles or dust will remain in the transport trough 22, thus preventing dust and extremely fine granite particles from spreading to the outside when the transport trough 22 overlaps with the feed inlet.

[0071] Reference Figure 3 An inclined guide plate 4 is provided on the upper part of the crushing assembly, with the lower end of the guide plate 4 facing the gap between the two crushing rollers 11.

[0072] The guide plate 4 is used to guide the crushed granite into the gap between the two crushing rollers 11.

[0073] Reference Figures 1-9 This invention also relates to a multi-stage homogeneous crushing process for granite, employing a multi-stage homogeneous crushing device for granite, the specific steps of which are as follows:

[0074] S1. Initial crushing: The granite is thrown into the outer shell 1 and crushed by the uppermost crushing component before falling.

[0075] S2, screening of extremely fine granite particles: falling granite particles pass through airflow screening zone 12, and extremely fine granite particles are blown out of airflow screening zone 12 and collected.

[0076] S3. Ordinary granite particle screening: Granite particles that have passed through the airflow screening zone 12 fall onto the screening plate 13 for screening. Granite particles that pass through the screening plate 13 are guided to the bottom of the outer shell 1. The intercepted granite particles fall into the second-stage crushing component under the guidance of the screening plate 13 for secondary crushing. This process is repeated until the particles fall to the bottom of the outer shell 1.

[0077] The complete working principle is as follows:

[0078] Feeding Stage: The linear actuator 24 is activated, causing the carrier block 21 on the conveyor shell 23 to slide, moving the carrier trough 22 on the carrier block 21 to directly below the feeding port. After a certain amount of granite to be crushed is fed into the carrier trough 22 from the feeding port, the linear actuator 24 is activated again, pushing the carrier block 21 into the enclosed shell 1 until the carrier trough 22 is completely inside the shell 1. At this time, the granite in the carrier trough 22 falls naturally and enters the crushing stage; at the same time, the fan 3 on the upper part of the shell 1 is activated, forming an airflow barrier to prevent the dust and extremely fine granite particles generated by the falling granite and subsequent crushing from spreading to the area of ​​the carrier trough 22, and to prevent dust and extremely fine granite particles from overflowing when the carrier block 21 is withdrawn.

[0079] Initial crushing stage: The falling granite first enters the uppermost crushing assembly inside the outer shell 1. One end of each of the two horizontal crushing rollers 11 of this assembly is connected to a heavy-duty motor. The motor drives the crushing rollers 11 to rotate relative to each other, crushing large granite particles into smaller particles through compression. Because multiple sets of crushing assemblies are arranged vertically within the device, and the gap between each set of crushing rollers 11 gradually decreases from top to bottom, the particles after the initial crushing fall directly to the next layer of crushing assemblies for the next round of crushing.

[0080] Fine particle screening and collection stage: Multiple independent airflow screening zones 12 are located between every two adjacent crushing components. The blower 1211 on the air blowing channel 121 is activated, drawing outside air into the airflow screening zone 12. The diverter 1212 at the connection between the air blowing channel 121 and the airflow screening zone 12, through vertically distributed air outlets 1213, creates a stable horizontal airflow of 4 m / s within the airflow screening zone 12. When crushed particles fall into the airflow screening zone 12, the 4 m / s horizontal airflow blows away extremely fine granite particles with a diameter less than 0.15 mm. These blown-away extremely fine granite particles are guided by the airflow into the exhaust channel 122 connected to the other side of the airflow screening zone 12, and finally fall into the bag collector on one side of the outer casing 1 for collection.

[0081] Secondary screening and circulating crushing stage: After airflow screening, the granite particles fall naturally to the inclined screening plate 13 below the airflow screening zone 12. Granite particles that meet the production standards pass through the screen holes of the screening plate 13 and fall into the collection bin 123 below, and fall into the bottom of the outer shell 1 under the guidance of the feed pipe 124; larger granite particles that do not meet the standards and are intercepted by the screening plate 13 are automatically slid down to the next crushing component under the guidance of the inclined angle of the screening plate 13, and undergo crushing, airflow screening and screening process again, repeating until the particles meet the standards or enter the bottom crushing component, and fall into the bottom of the outer shell 1 after being crushed by the bottom crushing component.

[0082] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A multi-stage homogeneous crushing device for granite, comprising a shell (1); Its features are, The crushing device also includes crushing components, an airflow screening zone (12), and a screening plate (13); Multiple crushing components are arranged vertically inside the housing (1). Each crushing component includes two horizontally arranged crushing rollers (11) with a gap between the two crushing rollers (11) for granite to pass through. Multiple airflow screening zones (12) are set between two adjacent crushing components. During crushing, airflow flowing in the horizontal direction is always generated in the airflow screening zone (12). The screening plate (13) is inclined and positioned below the airflow screening zone (12).

2. The multi-stage homogeneous crushing device for granite according to claim 1, characterized in that, The crushing components are arranged from top to bottom, and the gap between the two crushing rollers (11) in each crushing component gradually decreases.

3. The multi-stage homogeneous crushing device for granite according to claim 1, characterized in that, The outer casing (1) is also provided with an air blowing channel (121), an exhaust channel (122) and a cloth bag collector; An air blowing channel (121) is set on one side of the airflow screening area (12) and connected to the airflow screening area (12). A fan (1211) is set on the air blowing channel (121). The fan (1211) blows outside air horizontally into the airflow screening area (12) through the air blowing channel (121). The exhaust trough (122) is located on the other side of the airflow screening area (12) along the air outlet direction of the air blowing trough (121) and is connected to the airflow screening area (12); The bag collector is located on one side of the housing (1) and communicates with the exhaust duct (122).

4. The multi-stage homogeneous crushing device for granite according to claim 3, characterized in that, A splitter (1212) is provided at the connection between the air blowing channel (121) and the airflow screening area (12). Multiple air outlets (1213) are vertically arranged on the splitter (1212), and the fan (1211) communicates with the splitter (1212).

5. The multi-stage homogeneous crushing device for granite according to claim 3, characterized in that, The bottom of the exhaust duct (122) slopes downward toward the airflow screening area (12).

6. The multi-stage homogeneous crushing device for granite according to claim 1, characterized in that, A collection bin (123) is provided below the screening plate (13). The bottom of the collection bin (123) is inclined. A guide pipe (124) is provided on the lower side of the collection bin (123). The lower end of the guide pipe (124) is connected to the lower side wall of the outer shell (1).

7. The multi-stage homogeneous crushing device for granite according to claim 1, characterized in that, The upper part of the outer shell (1) is closed, and a feeding unit (2) is provided on the side wall of the outer shell (1). The feeding unit (2) includes a transport block (21) and a transport trough (22). The carrier block (21) is horizontally movable and positioned on one side of the outer shell (1) and can extend into the interior of the outer shell (1); The transport trough (22) is vertically opened through the transport block (21) and is used to store granite.

8. A multi-stage homogeneous crushing device for granite according to claim 7, characterized in that, A fan (3) is provided on the upper part of the outer shell (1). When the conveying trough (22) extends into the outer shell (1) to feed materials, the fan (3) is located directly above the conveying trough (22).

9. A multi-stage homogeneous crushing device for granite according to claim 1, characterized in that, An inclined guide plate (4) is provided on the upper part of the crushing assembly, with the lower end of the guide plate (4) facing the gap between the two crushing rollers (11).

10. A multi-stage homogeneous crushing process for granite, employing the multi-stage homogeneous crushing device for granite as described in any one of claims 1-9, characterized in that, The specific steps are as follows: S1. Initial crushing: The granite is thrown into the outer shell (1) and falls after being crushed by the uppermost crushing component. S2, screening of extremely fine granite particles: falling granite particles pass through the airflow screening zone (12), and extremely fine granite particles are blown out from the airflow screening zone (12) and collected. S3. Ordinary granite particle screening: granite particles that have passed through the airflow screening zone (12) fall onto the screening plate (13) for screening. The granite particles that pass through the screening plate (13) are guided to the bottom of the outer shell (1). The intercepted granite particles fall into the second-stage crushing component under the guidance of the screening plate (13) for secondary crushing. The cycle repeats until they fall to the bottom of the outer shell (1).

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