Raw material pretreatment and granulation production line for preparing green methanol from straw base
By introducing the circulation and cleaning components of a twin-shaft shredder into the straw pelleting production line, the problems of screen clogging and equipment jamming have been solved, achieving continuous straw crushing and efficient equipment operation, and reducing maintenance costs.
Patent Information
- Application Number
- CN202511358758.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2025-11-14
AI Technical Summary
Existing straw pelleting production lines suffer from problems such as screen clogging, frequent equipment jamming, inaccurate fault identification, and high motor failure rates, leading to production interruptions and increased maintenance costs.
The system employs a dual-shaft shredder combined with a circulation and cleaning assembly to achieve online cleaning and secondary crushing without disassembling the screen. A torque detection element identifies the cause of jamming, a steering switching mechanism prevents motor overload, and a closed conveyor and magnetic separation device prevent dust and equipment damage.
It improves the continuity of straw crushing and the service life of equipment, reduces downtime and maintenance costs, and ensures the stability and efficiency of production.
Smart Images
Figure CN120937642A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of straw pelleting technology, specifically a raw material pretreatment and pelleting production line for preparing green methanol from straw. Background Technology
[0002] With increasing global attention to climate change, my country has clearly stated its intention to vigorously develop biomass energy and promote the industrial application of clean energy sources such as green methanol. Furthermore, national policies strongly support the resource utilization of various raw materials, including agricultural waste (such as straw), forestry residues (such as wood), and urban solid waste. The utilization of these raw materials not only reduces environmental pollution but also achieves high-value-added resource transformation, promoting the development of a circular economy. Straw is a crucial raw material for the production of green methanol, and the high-quality pellets produced by straw pelleting production lines are closely related to the subsequent production quality of green methanol.
[0003] Current straw pelleting production lines typically include pretreatment crushing, pulverizing, and drying processes. Traditional straw pretreatment production lines usually require single-shaft or double-shaft shredders to process the straw. However, in actual operation, due to the high toughness and fiber entanglement of straw, problems such as screen clogging or main shaft jamming often occur. Furthermore, current straw pelleting production line pretreatment devices usually lack effective online cleaning and circulating crushing mechanisms. When too much unqualified material is retained by the screen, the machine must be stopped and the screen disassembled for manual cleaning, which not only interrupts production but also increases labor intensity. Finally, traditional straw... The pre-processing unit of the production line lacks a precise fault identification and handling mechanism. When the equipment jams, a complete shutdown is often required for troubleshooting, which not only prolongs the troubleshooting time but may also cause secondary damage to the equipment due to blind operation. At the same time, as the core power source of the crushing equipment, the traditional way to deal with faults such as straw entanglement is to directly change the direction of motor rotation to reverse and loosen it. However, the current surge and torque fluctuation generated in this process will accelerate the aging of the motor windings and the fatigue of transmission components, resulting in an increased motor failure rate, a shortened equipment lifespan, and a significant increase in the maintenance cost of the production line. Summary of the Invention
[0004] The purpose of this invention is to provide a raw material pretreatment and granulation production line for preparing green methanol from straw, so as to solve the problems raised in the prior art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a raw material pretreatment and granulation production line for preparing green methanol based on straw, comprising a feeding conveyor belt, a twin-shaft shredder, a crushing workshop, a drying workshop, a granulation workshop, and a cooling and packaging workshop arranged sequentially. During operation, the feeding conveyor belt evenly feeds straw into the twin-shaft shredder for pretreatment. The twin-shaft shredder crushes the material through shearing, tearing, and extrusion, ensuring the raw material meets the size requirements for further crushing. After pretreatment and crushing, the material is conveyed to the crushing workshop for tearing and impacting, so that the crushed material can meet the requirements for further crushing. To meet subsequent granulation or briquetting requirements, the drying workshop is used to dehumidify and dry materials with excessive moisture content. The dryers in the workshop are three-pass rotary drum dryers to extend the contact time between the material and hot air, reducing the length and floor space of the dryers. The fuel can be finished pellets from the production line, which are processed in a vertical cyclone furnace and then have their heat recovered through a spark settling chamber, or directly utilize the waste heat from a high-temperature gasification furnace to directly contact the wet material, thereby improving drying thermal efficiency. Once the material's moisture content and fineness meet granulation requirements, workers can use conveying equipment to feed the material into the granulator or briquetting machine. This process transforms materials into cylindrical granules or square / round blocks. Once shaped, the materials are transported to a cooling and packaging workshop where forced air cooling rapidly cools them to prevent cracking and facilitate subsequent product packaging. Compared to current raw material pretreatment and granulation production lines, the dual-shaft shredder in this invention includes a crushing box, a frame, and a power system. Both the crushing box and the power system are mounted on the frame. Two main shafts are positioned in the middle of the crushing box, each equipped with several cutters. The power system drives the two main shafts to rotate in opposite directions. The upper part of the crushing box is equipped with… The machine is equipped with a circulation component. A screen is installed at the lower end of the crushing box, and a cleaning component is installed above the screen. The cleaning component and the circulation component are connected by a ventilation pipe. When the straw falls into the twin-shaft shredder, it is crushed by several blades on the two main shafts. The screen traps the uncrushed straw. Through the cooperation of the cleaning component and the circulation component, the uncrushed straw can be passed back through the blades on the two main shafts and the screen can be cleaned without disassembling the screen. The above technical solution greatly ensures the continuity of straw crushing.
[0006] Furthermore, a discharge hopper is provided below the crushing box, and a belt conveyor is provided below the discharge hopper. The twin-shaft shredder is connected to the crushing workshop via the belt conveyor. The material crushed by the twin-shaft shredder is transported to the crushing workshop via the belt conveyor. A magnetic separator is provided on the belt conveyor to remove metal materials to avoid affecting subsequent crushing operations. The belt conveyor has a closed conveying function to prevent dust from being generated during the transportation of the crushed material.
[0007] Furthermore, the circulation component includes a circulation pipe and a fan, and the cleaning component includes a hollow pipe and a hollow frame. One end of the circulation pipe is connected to the fan via a connector, and the other end of the circulation pipe is connected to the hollow pipe via a ventilation pipe. The hollow frame is located below the hollow pipe. When the dual-shaft shredder is not in operation, the operator can use the fan to deliver outside air into the circulation pipe. At this time, the air will enter the hollow pipe along the ventilation pipe and then be discharged from the hollow frame. The air discharged from the hollow frame cleans the screen to prevent some material from remaining in the screen after the material is crushed, which could cause subsequent blockage.
[0008] Furthermore, a reversing motor is installed on the outside of the crushing box, and a first cavity and a second cavity are arranged opposite each other at both ends inside the crushing box. The ventilation pipe is installed in the first cavity, and a belt drive assembly is installed in the second cavity. The reversing motor is connected to the input end of the belt drive assembly. The end of the hollow tube near the first cavity is inserted into the ventilation pipe, and the hollow tube and the ventilation pipe form a rotatable fit. The end of the hollow tube near the second cavity is connected to the output end of the belt drive assembly. In this invention, the screen has an arc-shaped structure, and the axis of the screen overlaps with the axis of the hollow tube. When the cleaning assembly cleans the screen, the operator can simultaneously turn on the reversing motor. The reversing motor and the belt drive assembly drive the hollow tube and the hollow frame to rotate above the screen, thereby cleaning each area of the screen.
[0009] Furthermore, the blower has both suction and blowing functions. A first discharge hole is provided at the lower end of the circulation pipe, and a second discharge hole is provided at the lower end of the connector. An arc-shaped plate is provided below the first and second discharge holes. A mounting base is provided at the end of the circulation pipe near the ventilation pipe, and an opening and closing component is provided inside the mounting base. The arc-shaped plate is connected to the opening and closing component. A filter screen is provided inside the connector, and the angle between the filter screen and the second discharge hole is less than 90 degrees. During the straw crushing process, if too much unqualified straw is retained on the screen, the operator can pause the feeding of straw into the dual-shaft shredder and then adjust the direction of the blower's air inlet and outlet (i.e., the direction of the blower's air inlet near the circulation pipe is adjusted). The air inlet (the end of the fan furthest from the circulation pipe is the air outlet) continuously draws air from the circulation pipe to the outside environment. Under the fan's action, the unqualified straw trapped by the screen flows along the hollow frame, hollow pipe, ventilation pipe, and circulation pipe, eventually being intercepted by the filter. Then, the operator can drive the arc plate to rotate via the opening and closing assembly until the first and second discharge holes are opened. At this point, the unqualified straw will be crushed again by several blades. Through this technical solution, the present invention can perform secondary crushing of unqualified straw without disassembling the screen, thereby improving production continuity and preventing the accumulation of unqualified straw on the screen, which could cause subsequent screen blockage.
[0010] Furthermore, the opening and closing assembly includes a first rotating gear, a second rotating gear, and a rotating motor. The first rotating gear is connected to the arc-shaped plate, the second rotating gear is disposed outside the first rotating gear and meshes with the first rotating gear, and the rotating motor is connected to the second rotating gear. When it is necessary to drive the arc-shaped plate to rotate, the operator can turn on the rotating motor to drive the second rotating gear to rotate, thereby causing the first rotating gear and the arc-shaped plate to rotate around the axis of the circulation pipe.
[0011] Furthermore, the screen is connected to the crushing box via a fixed frame. A vibrator is installed inside the fixed frame. The working end of the vibrator is connected to the screen via a connecting frame. During the straw crushing process, the vibrator drives the screen to vibrate at the lower end inside the crushing box to accelerate the falling of the crushed and qualified straw.
[0012] Furthermore, the power system includes two drive motors, which are respectively located on both sides of the crushing box. Each drive motor is connected to a main shaft through a reduction gearbox, and drives the corresponding main shaft to rotate.
[0013] Furthermore, the gearbox is internally equipped with an input shaft and an output shaft. The input shaft is connected to the drive motor via a first coupling, and the output shaft is connected to the main shaft via a second coupling. The input shaft and output shaft are connected by a steering switching mechanism. A torque detection element is installed on the second coupling. During operation, if the dual-shaft shredder jams due to straw entanglement, the torque curve detected by the torque detection element will show a gradual upward trend. If the dual-shaft shredder jams due to stones (or metal), the torque detected by the torque detection element will show a downward trend. The moment curve will exhibit the characteristic of sudden sharp peaks. Through the above technical solution, the present invention can promptly determine the cause of the dual-shaft shredder jamming. When the dual-shaft shredder jams due to straw entanglement, the operator can change the rotation direction of the output shaft through the steering switching mechanism without changing the rotation direction of the drive motor, so that the main shaft can reverse so that the straw can be loosened under the action of reverse friction force, making it easier for subsequent cleaning. When the dual-shaft shredder jams due to stones (or metal), the operator must stop the machine immediately until the stones (or metal) are removed from the dual-shaft shredder.
[0014] Furthermore, the output shaft is provided with a first driven gear and a second driven gear, and the input shaft is provided with two limiting slots. One limiting slot houses the first driving gear, and the other limiting slot houses the second driving gear. An electromagnet is provided on each side of the first and second driving gears that are far apart from each other. Both electromagnets are fixedly connected to the input shaft. The steering switching mechanism includes a first support base and a second support base. The first support base is provided with a first transmission gear, and the second support base is provided with two second transmission gears. The first driving gear is connected to the first driven gear through one first transmission gear, and the second driving gear is connected to the second driven gear through the two second transmission gears. During normal operation, the electromagnet in contact with the first driving gear is in a state of... In the working state, the first drive gear is magnetically engaged (the electromagnet in contact with the second drive gear is in a non-working state). At this time, the first drive gear is fixed to the input shaft (the second drive gear is separated from the input shaft). When the input shaft rotates, the first drive gear, under the action of the first transmission gear, drives the first driven gear and the output shaft to rotate. When the operator needs to change the rotation direction of the output shaft, simply turn on the electromagnet in contact with the second drive gear and then turn off the electromagnet in contact with the first drive gear. At this time, the second drive gear is fixed to the input shaft (the first drive gear is separated from the input shaft). Under the action of the two second transmission gears, the second drive gear will drive the second driven gear and the output shaft to rotate in the opposite direction, thereby reversing the spindle without changing the rotation direction of the drive motor.
[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: Compared with current raw material pretreatment and pelletizing production lines, this invention solves the technical problem of frequent shutdowns for cleaning in traditional straw pretreatment production lines through structural innovation of the twin-shaft shredder, significantly improving the continuity of overall processing. By setting cleaning and circulation components inside the twin-shaft shredder, secondary crushing of unqualified materials can be completed without disassembling the screen. At the same time, the cleaning component has a self-rotating function. With the cooperation of the circulation component, after the twin-shaft shredder finishes working, the operator can directly clean all areas of the screen from all angles, effectively preventing blockages caused by material residue. In addition, in terms of environmental performance, this invention uses a closed conveying structure to transfer materials in a closed space, and with the help of a magnetic separator to remove metal impurities, it avoids... This invention eliminates dust pollution and prevents metal materials from damaging subsequent crushing equipment. Furthermore, it incorporates a steering switching mechanism within the gearbox and a torque detection element on the second coupling. This torque detection element helps operators identify different types of jamming characteristics, facilitating accurate fault diagnosis and triggering appropriate handling mechanisms to prevent equipment damage due to overload. When the dual-shaft shredder jams due to straw entanglement, operators can change the output shaft's rotation direction using the steering switching mechanism without altering the drive motor's rotation direction. This reverses the main shaft, allowing the straw to loosen under reverse friction, facilitating subsequent cleaning. Compared to reversing the main shaft by changing the drive motor's rotation direction, this invention effectively extends the drive motor's lifespan. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the dual-shaft shredder structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the crushing box of the present invention; Figure 4 This is a first-view schematic diagram of the cleaning component and the circulation component of the present invention; Figure 5 This is a second-view schematic diagram of the cleaning component and the circulation component of the present invention; Figure 6 This is a schematic diagram of the cleaning component structure of the present invention; Figure 7 This is a schematic diagram of the loop component structure of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the structure of section A; Figure 9 This is a schematic diagram of the screen structure of the present invention; Figure 10 This is a first-view schematic diagram of the interior of the gearbox of the present invention; Figure 11 This is a second-view schematic diagram of the interior of the gearbox of the present invention; Figure 12 This is a schematic diagram of the input shaft structure of the present invention.
[0017] In the diagram: 1. Feeding conveyor belt; 2. Twin-shaft shredder; 21. Crushing box; 211. Discharge hopper; 212. Circulation pipe; 2121. Connector; 21211. Filter screen; 2122. Arc plate; 2123. Mounting base; 21231. First rotating gear; 21232. Second rotating gear; 21233. Rotary motor; 213. Cutting tool; 214. Main shaft; 215. Screen; 2151. Fixing frame; 2152. Vibrator; 216. Fan; 217. Cleaning assembly; 2171. 2172 Hollow tube; 218 Hollow frame; 219 Ventilation duct; 22 Reversing motor; 23 Frame; 24 Gearbox; 231 Input shaft; 2311 First driving gear; 2312 Second driving gear; 2313 Electromagnet; 232 First transmission gear; 233 Second transmission gear; 234 Output shaft; 2341 First driven gear; 2342 Second driven gear; 24 Drive motor; 3 Crushing workshop; 4 Drying workshop; 5 Granulation workshop; 6 Cooling and packaging workshop. Detailed Implementation
[0018] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] Example: Figures 1-12As shown, this invention provides a technical solution: a raw material pretreatment and granulation production line for preparing green methanol based on straw. The line includes a feeding conveyor belt 1, a twin-shaft shredder 2, a crushing workshop 3, a drying workshop 4, a granulation workshop 5, and a cooling and packaging workshop 6, arranged sequentially. During operation, the feeding conveyor belt 1 evenly feeds straw into the twin-shaft shredder 2 for pretreatment. The twin-shaft shredder 2 crushes the material through shearing, tearing, and extrusion, ensuring the raw material meets the size requirements for further crushing. After pretreatment and crushing, the material is conveyed to the crushing workshop 3 for further tearing and impact, so that the crushed material meets the requirements for subsequent granulation or briquetting. Drying workshop 4 is used for dehumidifying and drying materials with excessive moisture content. The dryers in drying workshop 4 are three-pass rotary drum dryers to extend the contact time between the material and hot air, reducing the length and floor space of the dryers. The fuel can be finished pellets from the production line, which are processed in a vertical cyclone furnace and then have their heat recovered through a spark settling chamber, or directly utilize the waste heat from a high-temperature gasification furnace to directly contact the wet material, thereby improving drying thermal efficiency. Once the material's moisture content and fineness meet the granulation requirements, workers can use conveying equipment to feed the material into a pellet mill or briquetting machine to process it into cylindrical pellets or square / round blocks. After the material is processed and shaped, it is transported to the cooling and packaging workshop 6, where forced air cooling is used to rapidly cool the material to prevent cracking and facilitate subsequent product packaging. Compared with the current raw material pretreatment and granulation production line, the dual-shaft shredder 2 in this invention includes a crushing box 21, a frame 22, and a power system. The crushing box 21 and the power system are both mounted on the frame 22. Two main shafts 214 are located in the middle of the crushing box 21, and each main shaft 214 is equipped with several cutters 213. The power system drives the two main shafts 214 to rotate in opposite directions. A circulation component is located at the upper end of the crushing box 21, and a screen is located at the lower end of the crushing box 21. A cleaning component 217 is installed above the screen 215. The cleaning component 217 is connected to the circulation component through a ventilation pipe 218. When the straw falls into the dual-shaft shredder 2, it is crushed by several blades 213 on the two main shafts 214. The screen 215 intercepts the unqualified straw. Through the cooperation of the cleaning component 217 and the circulation component, the unqualified straw can be re-passed through the several blades 213 on the two main shafts 214 and the screen 215 can be cleaned without disassembling the screen 215. The above technical solution greatly ensures the continuity of straw crushing.
[0020] like Figures 1-3As shown, a discharge hopper 211 is provided below the crushing box 21, and a belt conveyor is provided below the discharge hopper 211. The twin-shaft shredder 2 and the crushing workshop 3 are connected by the belt conveyor. The material crushed by the twin-shaft shredder 2 is transported to the crushing workshop 3 by the belt conveyor. A magnetic separator is provided on the belt conveyor to pick out metal materials to avoid affecting subsequent crushing operations. The belt conveyor has a closed conveying function to prevent dust from being generated during the transportation of the crushed material.
[0021] like Figures 3-8 As shown, the circulation component includes a circulation pipe 212 and a fan 216, and the cleaning component 217 includes a hollow pipe 2171 and a hollow frame 2172. One end of the circulation pipe 212 is connected to the fan 216 through a connector 2121, and the other end of the circulation pipe 212 is connected to the hollow pipe 2171 through a ventilation pipe 218. The hollow frame 2172 is located below the hollow pipe 2171. When the dual-shaft shredder 2 is not in operation, the operator can use the fan 216 to deliver outside air into the circulation pipe 212. At this time, the air will enter the hollow pipe 2171 along the ventilation pipe 218 and then be discharged from the hollow frame 2172. The air discharged from the hollow frame 2172 cleans the screen 215 to prevent some material from remaining in the screen 215 after the material is crushed, which could cause blockage later.
[0022] like Figures 3-8 As shown, a reversing motor 219 is installed on the outside of the crushing box 21. A first cavity and a second cavity are arranged opposite to each other at both ends inside the crushing box 21. A ventilation pipe 218 is installed in the first cavity, and a belt drive assembly is installed in the second cavity. The reversing motor 219 is connected to the input end of the belt drive assembly. The end of the hollow tube 2171 near the first cavity is inserted into the ventilation pipe 218, and the hollow tube 2171 and the ventilation pipe 218 form a rotatable fit. The end of the hollow tube 2171 near the second cavity is connected to the output end of the belt drive assembly. In this invention, the screen 215 has an arc-shaped structure, and the axis of the screen 215 overlaps with the axis of the hollow tube 2171. When the cleaning assembly 217 cleans the screen 215, the operator can simultaneously turn on the reversing motor 219. The reversing motor 219 and the belt drive assembly drive the hollow tube 2171 and the hollow frame 2172 to rotate above the screen 215, thereby cleaning each area of the screen 215.
[0023] like Figures 4-8As shown, the blower 216 has both suction and blowing functions. A first discharge hole is located at the lower end of the circulation pipe 212, and a second discharge hole is located at the lower end of the connector 2121. An arc-shaped plate 2122 is located below the first and second discharge holes. A mounting base 2123 is located at the end of the circulation pipe 212 near the ventilation pipe 218. An opening and closing assembly is located inside the mounting base 2123. The arc-shaped plate 2122 is connected to the opening and closing assembly. A filter screen 21211 is located inside the connector 2121. The angle between the filter screen 21211 and the second discharge hole is less than 90 degrees. During the straw crushing process, if too much unqualified straw is retained on the screen 215, the operator can pause the feeding of straw into the dual-shaft shredder 2. Then, the direction of the air inlet and outlet of the blower 216 is adjusted (i.e., the end of the blower 216 near the circulation pipe 212 is the air inlet, and the end of the blower 216 near the circulation pipe 212 is the air inlet). 16 (the end away from the circulation pipe 212 is the air outlet) uses the fan 216 to continuously draw air from the circulation pipe 212 to the outside environment. At this time, under the action of the fan 216, the crushed and unqualified straw intercepted by the screen 215 will flow along the hollow frame 2172, hollow pipe 2171, ventilation pipe 218, and circulation pipe 212, and will eventually be intercepted by the filter screen 21211. Then, the operator can drive the arc plate 2122 to rotate through the opening and closing component until the first discharge hole and the second discharge hole are opened. At this time, the crushed and unqualified straw will be crushed again by several blades 213. Through the above technical solution, the present invention can perform secondary crushing of the crushed and unqualified straw without disassembling the screen 215, so as to improve the continuity of production and prevent the crushed and unqualified straw from accumulating on the screen 215 and causing subsequent screen 215 blockage problems.
[0024] like Figures 7-8 As shown, the opening and closing assembly includes a first rotating gear 21231, a second rotating gear 21232, and a rotating motor 21233. The first rotating gear 21231 is connected to the arc plate 2122. The second rotating gear 21232 is located outside the first rotating gear 21231 and meshes with it. The rotating motor 21233 is connected to the second rotating gear 21232. When it is necessary to drive the arc plate 2122 to rotate, the operator can turn on the rotating motor 21233, which drives the second rotating gear 21232 to rotate, thereby causing the first rotating gear 21231 and the arc plate 2122 to rotate around the axis of the circulation pipe 212.
[0025] like Figure 9 As shown, the screen 215 is connected to the crushing box 21 via a fixed frame 2151. The fixed frame 2151 is equipped with a vibrator 2152. The working end of the vibrator 2152 is connected to the screen 215 via a connecting frame. During the straw crushing process, the vibrator 2152 drives the screen 215 to vibrate at the lower end inside the crushing box 21 to accelerate the falling of the crushed and qualified straw.
[0026] like Figures 2-4 As shown, the power system includes two drive motors 24, which are respectively located on both sides of the crushing box 21. Each drive motor 24 is connected to a main shaft 214 through a reduction gearbox 23, and drives the corresponding main shaft 214 to rotate.
[0027] like Figures 2-3 As shown, the power system includes two drive motors 24, which are respectively located on both sides of the crushing box 21. Each drive motor 24 is connected to a main shaft 214 through a reduction gearbox 23, and drives the corresponding main shaft 214 to rotate.
[0028] like Figure 2 , Figure 10 As shown, the gearbox 23 is internally equipped with an input shaft 231 and an output shaft 234. The input shaft 231 is connected to the drive motor 24 via a first coupling, and the output shaft 234 is connected to the main shaft 214 via a second coupling. The input shaft 231 and the output shaft 234 are connected by a steering switching mechanism. A torque detection element is installed on the second coupling. During operation, if the dual-shaft shredder 2 jams due to straw entanglement, the torque curve detected by the torque detection element will show a gradual upward trend. If the dual-shaft shredder 2 jams due to stones (or metal), the torque curve detected by the torque detection element will show a gradual upward trend. The torque curve will exhibit a sudden spike. Through the above technical solution, the present invention can promptly determine the cause of the dual-shaft shredder 2 jamming. When the dual-shaft shredder 2 jams due to straw entanglement, the operator can change the rotation direction of the output shaft 234 through the steering switching mechanism without changing the rotation direction of the drive motor 24, so that the main shaft 214 can reverse, so that the straw can be loosened under the action of reverse friction force, making it easier for subsequent cleaning. When the dual-shaft shredder 2 jams due to stones (or metal), the operator must stop the machine immediately until the stones (or metal) are removed from the dual-shaft shredder 2.
[0029] like Figures 10-12As shown, the output shaft 234 is provided with a first driven gear 2341 and a second driven gear 2342. The input shaft 231 is provided with two limiting slots. One limiting slot is provided with a first driving gear 2311, and the other limiting slot is provided with a second driving gear 2312. An electromagnet 2313 is provided on the side of the first driving gear 2311 and the second driving gear 2312 that are far apart from each other. Both electromagnets 2313 are fixedly connected to the input shaft 231. The steering switching mechanism includes a first support base and a second support base. The first support base is provided with a first transmission gear 232, and the second support base is provided with two second transmission gears 233. The first driving gear 2311 is connected to the first driven gear 2341 through one first transmission gear 232, and the second driving gear 2312 is connected to the second driven gear 2342 through the two second transmission gears 233. In normal operation, the electromagnet 2313 in contact with the first driving gear 2311 is in working state and magnetically attracts the first driving gear 2311. (The electromagnet 2313 in contact with the second drive gear 2312 is in a non-working state). At this time, the first drive gear 2311 is fixed together with the input shaft 231 (the second drive gear 2312 is separated from the input shaft 231). When the input shaft 231 rotates, the first drive gear 2311, under the action of the first transmission gear 232, drives the first driven gear 2341 and the output shaft 234 to rotate. When the operator needs to change the rotation direction of the output shaft 234, he only needs to turn on the electromagnet 2313 in contact with the second drive gear 2312 and then turn off the electromagnet 2313 in contact with the first drive gear 2311. At this time, the second drive gear 2312 is fixed together with the input shaft 231 (the first drive gear 2311 is separated from the input shaft 231). Under the action of the two second transmission gears 233, the second drive gear 2312 will drive the second driven gear 2342 and the output shaft 234 to rotate in the opposite direction, so as to reverse the rotation direction of the drive motor 24.
[0030] The working principle of this invention is as follows: During operation, the feeding conveyor belt 1 evenly feeds straw into the twin-shaft shredder 2 for pre-treatment and crushing. After crushing, the material is conveyed to the crushing workshop 3 for tearing and impact. The drying workshop 4 is used to dehumidify and dry materials with excessive moisture. When the material's moisture and fineness meet the pelletizing requirements, it is conveyed to a pellet mill or briquetting machine to process it into cylindrical granules or square / round block-shaped finished products. After the material is shaped, it is conveyed to the cooling and packaging workshop 6 for cooling and packaging. During the crushing process in the twin-shaft shredder 2, this invention uses a screen 215 to intercept unqualified straw. If too much unqualified straw is intercepted on the screen 215, the operator can stop feeding straw into the twin-shaft shredder 2. Then, the fan 216 continuously draws air from the circulation pipe 212 to the outside environment. At this time, the air... Under the action of machine 216, the unqualified crushed straw intercepted by screen 215 will flow along hollow frame 2172, hollow tube 2171, ventilation tube 218, and circulation tube 212, and will eventually be intercepted by filter screen 21211. Then, the operator can drive the arc plate 2122 to rotate through the opening and closing component until the first discharge hole and the second discharge hole are opened. At this time, the unqualified crushed straw will be crushed again by several blades 213. After the dual-shaft shredder 2 finishes working, the operator can use fan 216 to send outside air into circulation tube 212. At this time, the air will enter hollow tube 2171 along ventilation tube 218 and then be discharged from hollow frame 2172. The air discharged from hollow frame 2172 will clean screen 215 to avoid some material remaining in screen 215 after material is crushed, which may cause blockage later.
[0031] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A raw material pretreatment and granulation production line for preparing green methanol based on straw, comprising a feeding conveyor belt (1), a twin-shaft shredder (2), a crushing workshop (3), a drying workshop (4), a granulation workshop (5), and a cooling and packaging workshop (6) arranged sequentially, characterized in that: The dual-shaft shredder (2) includes a crushing box (21), a frame (22), and a power system. Two main shafts (214) are arranged in the middle of the crushing box (21), and each main shaft (214) is equipped with several cutters (213). The two main shafts (214) are driven to rotate in opposite directions by the power system. A circulation component is arranged at the upper end of the crushing box (21), and a screen (215) is arranged at the lower end of the crushing box (21). A cleaning component (217) is arranged above the screen (215). The cleaning component (217) and the circulation component are connected by a ventilation pipe (218). The cleaning component (217) and the circulation component work together to crush the unqualified straw a second time and clean the screen (215).
2. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 1, is characterized in that: Below the crushing box (21) is a discharge hopper (211), and below the discharge hopper (211) is a belt conveyor. The dual-shaft shredder (2) is connected to the crushing workshop (3) via a belt conveyor. The belt conveyor has a closed conveying function and is equipped with a magnetic separation device.
3. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 1, is characterized in that: The circulation assembly includes a circulation pipe (212) and a fan (216). The cleaning assembly (217) includes a hollow pipe (2171) and a hollow frame (2172). One end of the circulation pipe (212) is connected to the fan (216) through a connector (2121), and the other end of the circulation pipe (212) is connected to the hollow pipe (2171) through a ventilation pipe (218). The hollow frame (2172) is located below the hollow pipe (2171).
4. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 3, is characterized in that: A reversing motor (219) is provided on the outside of the crushing box (21). A first cavity and a second cavity are provided at opposite ends inside the crushing box (21). A ventilation pipe (218) is provided in the first cavity. A belt drive assembly is provided in the second cavity. The end of the hollow tube (2171) near the first cavity is inserted into the ventilation pipe (218), and the hollow tube (2171) and the ventilation pipe (218) form a rotatable fit. The end of the hollow tube (2171) near the second cavity is connected to the reversing motor (219) through the belt drive assembly.
5. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 3, is characterized in that: The blower (216) has both suction and blowing functions. The lower end of the circulation pipe (212) is provided with a first discharge hole, and the lower end of the connector (2121) is provided with a second discharge hole. An arc plate (2122) is provided below the first discharge hole and the second discharge hole. A mounting base (2123) is provided at one end of the circulation pipe (212) near the ventilation pipe (218). An opening and closing component is provided inside the mounting base (2123). The arc plate (2122) is connected to the opening and closing component. A filter screen (21211) is provided inside the connector (2121). The included angle between the filter screen (21211) and the second discharge hole is less than 90 degrees.
6. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 5, is characterized in that: The opening and closing assembly includes a first rotating gear (21231), a second rotating gear (21232), and a rotary motor (21233). The first rotating gear (21231) is connected to the arc plate (2122). The second rotating gear (21232) is disposed outside the first rotating gear (21231) and meshes with the first rotating gear (21231). The rotary motor (21233) is connected to the second rotating gear (21232).
7. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 1, is characterized in that: The screen (215) is connected to the crushing box (21) through a fixed frame (2151). The fixed frame (2151) is equipped with a vibrator (2152). The working end of the vibrator (2152) is connected to the screen (215) through a connecting frame.
8. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 1, is characterized in that: The power system includes two drive motors (24), which are respectively located on both sides of the crushing box (21). Each drive motor (24) is connected to a main shaft (214) through a reduction gearbox (23).
9. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 8, is characterized in that: The gearbox (23) is equipped with an input shaft (231) and an output shaft (234). The input shaft (231) is connected to the drive motor (24) through a first coupling, and the output shaft (234) is connected to the main shaft (214) through a second coupling. The input shaft (231) and the output shaft (234) are connected by a steering switching mechanism. The second coupling is equipped with a torque detection element.
10. The raw material pretreatment and granulation production line for preparing green methanol based on straw, as described in claim 9, is characterized in that: The output shaft (234) is provided with a first driven gear (2341) and a second driven gear (2342), and the input shaft (231) is provided with a first driving gear (2311) and a second driving gear (2312). An electromagnet (2313) is provided on the side of the first driving gear (2311) and the second driving gear (2312) that are far apart from each other. Both electromagnets (2313) are fixedly connected to the input shaft (231). The steering switching mechanism includes a first transmission gear (232) and two second transmission gears (233). The first driving gear (2311) is connected to the first driven gear (2341) through the first transmission gear (232), and the second driving gear (2312) is connected to the second driven gear (2342) through the two second transmission gears (233).