Crushing and screening system for lithium hexafluorophosphate crystals

Abstract

This invention relates to a crushing and screening system for lithium hexafluorophosphate crystals, belonging to the technical field of crushing and screening equipment for lithium hexafluorophosphate crystals. The invention includes a casing, a first-stage crushing mechanism, a second-stage crushing mechanism, a third-stage crushing mechanism, a first screen plate, a second screen plate, and a first guiding assembly. The casing has a feed inlet at the top and a discharge outlet at the bottom. The first, second, and third-stage crushing mechanisms are arranged sequentially from top to bottom within the casing, with the outlet of the previous crushing mechanism staggered from the inlet of the next crushing mechanism. The first screen plate guides the crystals from the outlet of the first-stage crushing mechanism into the second-stage crushing mechanism, and the second screen plate guides the crystals from the outlet of the second-stage crushing mechanism into the third-stage crushing mechanism. The first and second screen plates screen out crystals of acceptable particle size. The first guiding assembly has interconnected transverse and vertical material guiding channels, with the transverse material guiding channel extending below the first screen plate.

Description

Technical Field

[0001] This invention relates to the field of crushing and screening equipment for lithium hexafluorophosphate crystals, and particularly to a crushing and screening system for lithium hexafluorophosphate crystals. Background Technology

[0002] In the production process of lithium hexafluorophosphate crystals, powder is generated in steps such as air conveying, drying, screening and crushing. Among them, the powder generated in the crushing process accounts for the largest proportion. The reason for this is that in order to make lithium hexafluorophosphate crystals into the appropriate size, when using a graded crushing mechanism to crush lithium hexafluorophosphate crystals in multiple stages, there is a problem of over-crushing of lithium hexafluorophosphate crystals.

[0003] Existing multi-stage crushing mechanisms typically screen the material crushed at the previous stage, sending smaller pieces to the next stage for further crushing, while larger, insufficiently crushed lithium hexafluorophosphate crystals are removed and re-crushed. For example, the high-efficiency, energy-saving multi-stage crushing and screening integrated machine disclosed in patent application CN106861812A removes larger materials and sends smaller ones to the next stage of crushing rollers. However, using this equipment to crush lithium hexafluorophosphate crystals would cause those already crushed to the required size in the previous stage to flow to the next stage for further crushing. This leads to over-crushing of the lithium hexafluorophosphate crystals, with a large portion becoming lithium hexafluorophosphate powder, resulting in waste. Summary of the Invention

[0004] This invention provides a crushing and screening system for lithium hexafluorophosphate crystals to solve the technical problem that existing crushing devices for lithium hexafluorophosphate crystals over-crush the crystals, generating a large amount of lithium hexafluorophosphate powder, thus causing waste.

[0005] To solve the above problems, the lithium hexafluorophosphate crystal crushing and screening system provided by the present invention adopts the following technical solution:

[0006] A crushing and screening system for lithium hexafluorophosphate crystals includes:

[0007] The machine casing has a feed inlet at the top and a discharge outlet at the bottom.

[0008] The first-stage crushing mechanism, the second-stage crushing mechanism, and the third-stage crushing mechanism are arranged sequentially from top to bottom inside the machine casing, and the crushing particle size of the first-stage crushing mechanism, the second-stage crushing mechanism, and the third-stage crushing mechanism gradually decreases. The outlet of the upper-stage crushing mechanism and the inlet of the lower-stage crushing mechanism are staggered in the horizontal direction.

[0009] The first screen plate and the second screen plate are located inside the casing. The first screen plate is used to guide the crystals from the outlet of the first-stage crushing mechanism into the second-stage crushing mechanism, and the second screen plate is used to guide the crystals from the outlet of the second-stage crushing mechanism into the third-stage crushing mechanism. The first screen plate and the second screen plate are used to screen out crystals with qualified particle size.

[0010] The first guiding component has a transverse guiding channel and a vertical guiding channel that are interconnected. The transverse guiding channel extends to the bottom of the first screen plate and is used to receive the crystals screened out by the first screen plate and transport them to one side of the second-stage crushing mechanism and the third-stage crushing mechanism. The vertical guiding channel is used to guide the crystals in the transverse guiding channel to the discharge port.

[0011] The beneficial effects of the above technical solution are as follows: a screen plate is set between each two adjacent crushing mechanisms to screen the crushed lithium hexafluorophosphate crystals, and a guide component is set below the screen plate to guide the qualified lithium hexafluorophosphate crystals that have been screened off to the discharge port for discharge. This avoids the lithium hexafluorophosphate crystals that have been crushed to a qualified size in the previous crushing process flowing to the first crushing mechanism to be crushed again, resulting in the lithium hexafluorophosphate crystals being crushed into powder and wasting.

[0012] A horizontal guide channel is set up to guide the lithium hexafluorophosphate crystals to the side of the second and third stage crushing mechanisms, and then the vertical guide channel discharges them to the discharge port. This allows the lithium hexafluorophosphate crystals to avoid the second and third stage crushing mechanisms and fall to the discharge port without affecting the crushing of the second and third stage crushing mechanisms.

[0013] Furthermore, the second-stage crushing mechanism includes two sets of secondary crushing components arranged at intervals in the horizontal direction. Two first screen plates are provided between the first-stage crushing mechanism and the second-stage crushing mechanism. The two first screen plates are inclined from top to bottom from the outlet of the first-stage crushing mechanism toward the inlet of the corresponding secondary crushing component. The transverse material guide channel is located below the two first screen plates.

[0014] Two second screen plates are provided between the second-stage crushing mechanism and the third-stage crushing mechanism. The two second screen plates are inclined from top to bottom from the outlet of the corresponding second-stage crushing component toward the inlet of the third-stage crushing mechanism.

[0015] The beneficial effects of the above technical solution are: setting two sets of secondary crushing components can reduce the crushing pressure of each set of secondary crushing components, reduce the wear and tear on each set of secondary crushing components during the crushing process, and give each set of secondary crushing components a longer service life.

[0016] Furthermore, the lithium hexafluorophosphate crystal crushing and screening system also includes a vibrator, which is connected to two first screen plates and two second screen plates to drive the two first screen plates and two second screen plates to vibrate and screen the material.

[0017] The beneficial effects of the above technical solution are: setting up a vibrator to drive the screen plate to vibrate and screen the material can speed up the screening speed and improve the screening effect.

[0018] Furthermore, the transverse material guide channel is connected to the two first screen plates, and the vibrator is connected to the transverse material guide channel. The vibrator is used to drive the transverse material guide channel and the two first screen plates to vibrate synchronously.

[0019] The beneficial effects of the above technical solution are as follows: the vibrator is connected to the transverse guide channel, and the vibrator drives the transverse guide channel to vibrate, so that the material in the transverse guide channel can be discharged smoothly. The transverse guide channel is connected to two first screen plates. While the vibrator drives the transverse guide channel to vibrate, it can also transmit the vibration to the two first screen plates. One vibrator can drive the two first screen plates and the transverse guide channel to vibrate synchronously, which can simplify the equipment structure and reduce the equipment cost.

[0020] Furthermore, a first rotating block is provided at the outlet of the first-stage crushing mechanism. The first rotating block is installed inside the casing and can swing around the horizontal axis. Both first screen plates are connected to the first rotating block.

[0021] The beneficial effects of the above technical solution are: both first screen plates are connected to the first rotating block, so that the two first screen plates can rotate. When the vibrator drives the two first screen plates to vibrate, the first screen plates can swing back and forth around the horizontal axis. Compared with fixing the first screen plates in the machine casing, it can avoid the phenomenon that a large amount of vibration is transmitted to the machine casing when the vibrator drives the first screen plates to vibrate, which would cause the machine casing to vibrate violently.

[0022] Furthermore, each of the two second screen plates is provided with a set of second guiding components below it. Each set of second guiding components includes a first guiding plate and a second guiding plate. A V-shaped material dropping space is formed between the first guiding plate and the second guiding plate. The material dropping space is used for qualified lithium hexafluorophosphate crystals screened by the second screen plates to fall into. There is a gap between the bottom end of the first guiding plate and the bottom end of the second guiding plate. The first guiding plate or the second guiding plate is inclined toward the discharge port to guide the lithium hexafluorophosphate crystals in the material dropping space to the discharge port.

[0023] The beneficial effects of the above technical solution are: a V-shaped material dropping space is formed between the first guide plate and the second guide plate, which can concentrate and guide the qualified lithium hexafluorophosphate crystals that have been screened to the discharge port for discharge, thus avoiding the lithium hexafluorophosphate crystals from scattering everywhere during the falling process.

[0024] Furthermore, the housing is provided with two second rotating blocks arranged at intervals in the horizontal direction and capable of swinging around the horizontal axis. The two second screen plates are respectively connected to the two second rotating blocks, and the guide plate of the first guide plate and the second guide plate that is close to the corresponding second screen plate is connected to the corresponding second rotating block.

[0025] The beneficial effects of the above technical solution are: when the vibrator drives the second screen plate to vibrate, it also drives the guide plate, which is connected to the second rotating block together with the second screen plate, to vibrate, which facilitates the vibration discharge of the guide plate.

[0026] Furthermore, a conveying auger is rotatably mounted in the inner cavity of the transverse material guide channel. The conveying auger is used to transport the lithium hexafluorophosphate crystals in the transverse material guide channel to the entrance of the vertical material guide channel.

[0027] The beneficial effects of the above technical solution are: by setting up a conveying auger in the collection hopper, the lithium hexafluorophosphate crystals in the collection hopper can be easily conveyed to the guide channel for discharge, thereby improving the discharge speed.

[0028] Furthermore, the conveying auger has an auger shaft, with one end of the auger shaft near the vertical guide channel extending to the outside of the horizontal guide channel;

[0029] A rotating drive is provided on the side of the transverse material guide channel. The rotating output end of the rotating drive is connected to a pressure plate that can reciprocate along the axis of the auger shaft. The pressure plate and the rotating output end of the rotating drive are anti-rotationally engaged so that the rotating drive drives the pressure plate to rotate. A compression spring is connected between the pressure plate and the rotating output end of the rotating drive. The compression spring is in a compressed state and is used to press the pressure plate tightly onto the auger shaft so that when the rotating drive drives the pressure plate to rotate, the pressure plate drives the auger shaft to rotate.

[0030] At the entrance of the vertical guide channel, there is a push block that can reciprocate along the axis of the auger shaft. A push rod is connected to the push block and the push rod is connected to the pressure plate. The push block is used to move horizontally under the push of external force, thereby driving the push rod to move toward the pressure plate and move the pressure plate away from the auger shaft.

[0031] The beneficial effects of the above technical solution are as follows: The compression spring presses the first pressure plate tightly onto the auger shaft. When the rotating drive unit drives the first pressure plate to rotate, the first pressure plate drives the auger shaft to rotate through friction transmission, thereby conveying the lithium hexafluorophosphate crystals in the collection hopper to the guide channel for discharge. When a blockage occurs in the guide channel, if the conveying auger continues to convey the lithium hexafluorophosphate crystals in the collection hopper to the guide channel, a large amount of lithium hexafluorophosphate crystals will accumulate at the entrance of the guide channel. The lithium hexafluorophosphate crystals at this point are squeezed by the lithium hexafluorophosphate crystals subsequently conveyed by the conveying auger, increasing the pressure at the entrance of the guide channel. The lithium hexafluorophosphate crystals at the entrance of the guide channel push the push block to move outward, thereby causing the push rod to drive the first pressure plate away from the auger shaft. The first pressure plate can no longer press tightly onto the auger shaft and cannot drive the auger shaft to rotate, causing the conveying auger to stop conveying lithium hexafluorophosphate crystals forward, thus preventing the accumulation of more and more lithium hexafluorophosphate crystals at the entrance of the collection hopper and alleviating the blockage.

[0032] Furthermore, a discharge auger is provided in the vertical guide channel, and a rotatable transmission wheel is provided on the side of the pressure plate facing away from the auger shaft. The transmission wheel is connected to the discharge auger. The push block is used to drive the push rod to move toward the pressure plate, so as to push the pressure plate to press on the transmission wheel and drive the transmission wheel to rotate, thereby driving the discharge auger to rotate and discharge material.

[0033] The beneficial effects of the above technical solution are: the push rod pushes the first pressure plate to move away from the hinge shaft, so that the first pressure plate presses against the transmission wheel. At this time, the first pressure plate can drive the transmission wheel to rotate through friction transmission. The transmission wheel drives the discharge auger in the guide channel to rotate, thereby increasing the discharge speed in the guide channel and further alleviating blockage. Attached Figure Description

[0034] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0035] Figure 1 Schematic diagram of the structure of the lithium hexafluorophosphate crystal crushing and screening system provided by the present invention Figure 1 ;

[0036] Figure 2 Schematic diagram of the structure of the lithium hexafluorophosphate crystal crushing and screening system provided by the present invention Figure 2 ;

[0037] Figure 3 This is a schematic diagram of the structure of the collection hopper in the crushing and screening system for lithium hexafluorophosphate crystals provided by the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Casing; 2. First-stage crushing mechanism; 3. Second-stage crushing mechanism; 4. Third-stage crushing mechanism; 5. First screen plate; 6. First rotating block; 7. First guide assembly; 701. Horizontal guide channel; 702. Vertical guide channel; 8. Second screen plate; 9. Vibrator; 10. First guide plate; 11. Second guide plate; 12. Second rotating block; 13. Conveying auger; 14. Discharge auger; 15. Rotary drive component; 16. Push block; 17. Push rod; 18. First pressure plate; 19. Transmission wheel; 20. Moving rod; 21. Compression spring; 22. Support sleeve; 23. Connecting rod; 24. Second pressure plate; 25. Conical gear ring; 26. Transmission belt; 27. Driven wheel; 28. Bevel gear; 29. ​​Rotating sleeve. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] The following is one embodiment of the lithium hexafluorophosphate crystal crushing and screening system provided by the present invention:

[0042] like Figure 1 As shown, the lithium hexafluorophosphate crystal crushing and screening system includes a housing 1, a crushing mechanism, a screen plate, a guide assembly, and a vibrator 9. The housing 1 has a feed inlet at the top and a discharge outlet at the bottom. A star-shaped quantitative feeder is installed at the feed inlet for quantitative feeding; this star-shaped quantitative feeder is existing technology and its specific structure will not be described in detail here. Inside the housing 1, from top to bottom, are arranged a first-stage crushing mechanism 2, a second-stage crushing mechanism 3, and a third-stage crushing mechanism 4, all using a double-roller extrusion crushing mechanism. Specifically, the first-stage crushing mechanism 2 is a threaded roller double-roller extrusion crushing mechanism with a roller gap of 3mm. This mechanism includes two parallel threaded crushing rollers; the space above the two rollers forms the inlet of the first-stage crushing mechanism 2, and the space below forms the outlet.

[0043] The aforementioned second-stage crushing mechanism 3 includes two sets of secondary crushing components arranged at intervals in the horizontal direction. Specifically, the secondary crushing components adopt flat roller extrusion crushing components with a roller gap of 1mm. The flat roller extrusion crushing components include two parallel first flat rollers. The upper space between the two first flat rollers forms the inlet of the secondary crushing components, and the lower space between the two first flat rollers forms the outlet of the secondary crushing components.

[0044] The aforementioned third-stage crushing mechanism 4 specifically adopts a flat roller extrusion crushing mechanism with a roller gap of 0.4mm. This flat roller extrusion crushing mechanism includes two parallel second flat rollers. The upper space between the two second flat rollers forms the inlet of the third-stage crushing mechanism 4, and the lower space between the two second flat rollers forms the outlet of the third-stage crushing mechanism 4.

[0045] The outlet of the first-stage crushing mechanism 2 is provided with a first rotating block 6 that can rotate around a horizontal axis. The first rotating block 6 has two first connecting surfaces that are far apart from each other from top to bottom. A first screen plate 5 is connected to each of the two first connecting surfaces. The two first screen plates 5 are inclined from the discharge port of the first-stage crushing mechanism 2 toward the inlet of the corresponding second-stage crushing component.

[0046] Below the two first screen plates 5, there is a first guide assembly 7. The first guide assembly 7 is located between the two sets of secondary crushing components. The first guide assembly 7 includes a transverse guide channel 701 and a vertical guide channel 702 connected to the bottom of the transverse guide channel 701. The vertical guide channel 702 extends to the discharge port on the casing 1.

[0047] Each of the above-mentioned secondary crushing components is provided with a second screen plate 8 below it. The third-stage crushing mechanism 4 is located directly below the two sets of secondary crushing components. The two second screen plates 8 are inclined from top to bottom from the discharge port of the corresponding secondary crushing component toward the inlet of the third-stage crushing mechanism 4, so as to guide the lithium hexafluorophosphate crystals that cannot be screened out to the inlet of the third-stage crushing mechanism 4.

[0048] Below each second sieve plate 8, there is a set of second guiding components. Each set of second guiding components includes a first guiding plate 10 and a second guiding plate 11, forming a V-shaped material discharge space between the first guiding plate 10 and the second guiding plate 11. The two first guiding plates 10 approach each other from top to bottom, with their bottom ends extending to the discharge port. The first guiding plates 10 are used to guide the lithium hexafluorophosphate crystals screened off from the second sieve plate 8 to the discharge port. The two second guiding plates 11 move away from each other from top to bottom, with their ends pointing towards the corresponding first guiding plate 10, so as to guide the lithium hexafluorophosphate crystals screened off from the second sieve plate 8 onto the first guiding plate 10.

[0049] The third-stage crushing mechanism 4 has a second rotating block 12 rotatably mounted on each side of the feed inlet. Each second rotating block 12 has two second connecting surfaces that are far apart from each other from top to bottom. The second screen plate 8 and the corresponding second guide plate 11 are respectively connected to the two second connecting surfaces on the corresponding second rotating block 12.

[0050] The aforementioned housing 1 houses a vibrator 9, which is connected to the aforementioned transverse material guide channel 701 to drive the transverse material guide channel 701 to vibrate and discharge material. The transverse material guide channel 701 is connected to two first screen plates 5 to transmit vibration to the two first screen plates 5, causing the two first screen plates 5 to vibrate and screen material. The vibrator 9 is also connected to two second screen plates 8 via two connecting rods 23. One end of the connecting rod 23 is fixedly connected to the vibration output end of the vibrator 9, and the other end of the connecting rod 23 is hinged to the second screen plates 8, so that the vibrator 9 drives the two second screen plates 8 to vibrate and discharge material. While the second screen plates 8 vibrate, the vibration is transmitted to the second guide plates 11 via the second rotating block 12, causing the two second guide plates 11 to vibrate and discharge material.

[0051] The aforementioned vertical feeding channel 702 is connected to the bottom of one end of the horizontal feeding channel 701. A conveying auger 13 is provided within the horizontal feeding channel 701. The conveying auger 13 is used to convey lithium hexafluorophosphate crystals within the horizontal feeding channel 701 toward the inlet end of the vertical feeding channel 702. The conveying auger 13 includes an auger shaft and auger blades connected to the outside of the auger shaft. The end of the auger shaft near the vertical feeding channel 702 extends to the outside of the horizontal feeding channel 701. A pusher block 16, which can reciprocate along the axial direction of the auger shaft, is installed on the side wall of the horizontal feeding channel 701 through which the end of the auger shaft near the vertical feeding channel 702 passes. A push rod 17 is connected to the end of the pusher block 16 facing away from the inner cavity of the horizontal feeding channel 701, and the push rod 17 extends to the outside of the horizontal feeding channel 701.

[0052] A rotary drive component 15 is provided on the side of the aforementioned transverse guide channel 701. The rotary drive component 15 is a rotary drive motor, and the output shaft of the rotary drive motor is coaxial with the auger shaft. A moving rod 20 is connected to the output shaft end of the rotary drive motor to prevent rotation. Specifically, the moving rod 20 has a square cross-section, and a square-cross-section insertion hole is opened on the output shaft of the rotary drive motor. The moving rod 20 is inserted into the insertion hole, so that the rotary drive motor can drive the moving rod 20 to rotate synchronously. The moving rod 20 can reciprocate along the axis of the output shaft of the rotary drive motor within the insertion hole. A first pressure plate 18 is connected to the end of the moving rod 20 away from the output shaft end of the rotary drive motor. A compression spring 21 is connected between the first pressure plate 18 and the output shaft end of the rotary drive motor. The end of the aforementioned auger shaft that extends out of the transverse material guide channel 701 is connected to a second pressure plate 24. The aforementioned compression spring 21 is in a compressed state. The compression spring 21 is used to press the first pressure plate 18 against the second pressure plate 24. When the rotation drive motor drives the first pressure plate 18 to rotate, the second pressure plate 24 is driven to rotate through friction transmission, thereby driving the conveying auger 13 to rotate and convey materials.

[0053] The first pressure plate 18 has a circular groove on its side wall facing the second pressure plate 24, and the end of the push rod 17 facing away from the push block 16 is inserted into the groove.

[0054] A support sleeve 22 is connected to the motor housing 1 of the aforementioned rotary drive motor. The support sleeve 22 is coaxially sleeved on the outside of the motor output shaft. The end of the support sleeve 22 away from the motor housing 1 extends to the side of the first pressure plate 18. A transmission wheel 19 is rotatably mounted on the end of the support sleeve 22 away from the motor housing 1.

[0055] A rotating sleeve 29 is rotatably mounted inside the aforementioned vertical material guide channel 702, fitting against the inner wall of the vertical material guide channel 702. The rotating sleeve 29 and the vertical material guide channel 702 are in a stop-locking engagement in the vertical direction. Specifically, the inner wall of the vertical material guide channel 702 is provided with a stop step, and the outer ring of the rotating sleeve 29 is provided with a stop boss. The stop boss is placed on the stop step to prevent the rotating sleeve 29 from falling off. A discharge auger 14 is connected to the inner side of the rotating sleeve 29. The discharge auger 14 includes discharge auger blades, which are welded to the inner wall of the rotating sleeve 29. The bottom end of the rotating sleeve 29 extends to the outside of the vertical guide channel 702. A conical gear ring 25 is connected to the outer wall of the portion of the rotating sleeve 29 extending to the outside of the vertical guide channel 702. A transmission belt 26 is fitted on the aforementioned transmission wheel 19. A driven wheel 27 is provided on the side of the transmission wheel 19. The other end of the transmission belt 26 is fitted on the driven wheel 27. A bevel gear 28 coaxial with the driven wheel 27 is provided on the side of the driven wheel 27. The bevel gear 28 and the driven wheel 27 are connected to the same transmission shaft. The bevel gear 28 meshes with the aforementioned conical gear ring 25.

[0056] In use, lithium hexafluorophosphate crystals are fed into the machine housing 1 through the feed port. After being crushed by the first-stage crushing mechanism 2, the lithium hexafluorophosphate crystals fall onto two first screen plates 5. The vibrating machine 9 drives the two first screen plates 5 to vibrate and screen the material. Lithium hexafluorophosphate crystals of qualified size fall from the two first screen plates 5 into the horizontal guide channel 701 below the two first screen plates 5. The conveying auger 13 in the horizontal guide channel 701 transports the lithium hexafluorophosphate crystals to the vertical guide channel 702 for discharge. The lithium hexafluorophosphate crystals fall along the vertical guide channel 702 to the discharge port. Lithium hexafluorophosphate crystals that do not meet size requirements are guided by the top surface of the second screen plate 8 and fall into two sets of secondary crushing components. The secondary crushing components further crush the lithium hexafluorophosphate crystals. The crushed lithium hexafluorophosphate crystals fall onto the two second screen plates 8. The vibrating machine 9 drives the two second screen plates 8 to vibrate and screen the material. The lithium hexafluorophosphate crystals that pass through the second screen plates 8 fall into the material discharge space between the corresponding first guide plate 10 and second guide plate 11, and are guided by the first guide plate 10 to the discharge port for discharge. Lithium hexafluorophosphate crystals that do not pass through the second screen plate 8 are guided by the top surface of the second screen plate 8 to the third-stage crushing mechanism 4. The third-stage crushing mechanism 4 crushes the lithium hexafluorophosphate crystals into qualified sizes and discharges them to the discharge port.

[0057] When lithium hexafluorophosphate crystals become blocked in the vertical feeding channel 702, a large amount of material accumulates at the inlet of the vertical feeding channel 702, increasing the pressure at the vertical feeding channel 702. The material squeezes the push block 16, causing the push block 16 to move. The push block 16 then moves the push rod 17, which pushes the first pressure plate 18 away from the first pressure plate 18, causing the auger shaft to stop rotating. The conveying auger 13 also stops rotating, stopping the material feeding into the vertical feeding channel 702, thus alleviating the blockage at the vertical feeding channel 702. The push rod 17 pushes the first pressure plate 18 toward the transmission wheel 19, causing the first pressure plate 18 to press firmly onto the transmission wheel 19. The first pressure plate 18 drives the transmission wheel 19 to rotate, which in turn drives the rotating sleeve 29 and the blades of the discharge auger 14 to rotate and discharge the material, further alleviating the blockage in the vertical feeding channel 702.

[0058] This invention reduces the amount of lithium hexafluorophosphate powder generated during crushing by adding a screening device after each first-stage crushing mechanism to promptly screen out and collect lithium hexafluorophosphate crystals of the correct size. This minimizes waste. The invention uses only one vibrator to simultaneously drive two first screen plates, a transverse guide channel, two second screen plates, and two second guide plates, maximizing the vibrator's effectiveness, simplifying the equipment structure, and effectively reducing costs. Furthermore, this invention can promptly stop the conveying auger and control the discharge auger's rotation when blockage occurs in the vertical guide channel, effectively alleviating blockages.

[0059] In this embodiment, a third-stage crushing mechanism is provided to crush and screen the lithium hexafluorophosphate crystals. In other embodiments, a second-stage, fourth-stage, or more-stage crushing mechanism can be provided to crush the lithium hexafluorophosphate crystals sequentially.

[0060] In this embodiment, the vibrator is connected to the transverse guide channel, which is connected to two first screen plates to enable the vibrator to drive the first screen plates to vibrate. In other embodiments, the vibrator is directly connected to the two first screen plates to drive the two first screen plates to vibrate and screen the material.

[0061] In this embodiment, a discharge auger is provided in the vertical guide channel, and a transmission wheel is provided on the outside of the horizontal guide channel to transmit power to the discharge auger, driving the discharge auger to rotate and discharge material. In other embodiments, no discharge auger is provided in the vertical guide channel, and no transmission wheel is provided on the outside of the horizontal guide channel. In this case, the blockage at the vertical guide channel is relieved by simply stopping the conveying auger.

Claims

1. A crushing and screening system for lithium hexafluorophosphate crystals, characterized in that, include: The machine casing has a feed inlet at the top and a discharge outlet at the bottom. The first-stage crushing mechanism, the second-stage crushing mechanism, and the third-stage crushing mechanism are arranged sequentially from top to bottom inside the machine casing, and the crushing particle size of the first-stage crushing mechanism, the second-stage crushing mechanism, and the third-stage crushing mechanism gradually decreases. The outlet of the upper-stage crushing mechanism and the inlet of the lower-stage crushing mechanism are staggered in the horizontal direction. The first screen plate and the second screen plate are located inside the casing. The first screen plate is used to guide the crystals from the outlet of the first-stage crushing mechanism into the second-stage crushing mechanism, and the second screen plate is used to guide the crystals from the outlet of the second-stage crushing mechanism into the third-stage crushing mechanism. The first screen plate and the second screen plate are used to screen out crystals with qualified particle size. The first guiding component has a transverse guiding channel and a vertical guiding channel that are interconnected. The transverse guiding channel extends to the bottom of the first screen plate and is used to receive the crystals screened out by the first screen plate and transport them to one side of the second-stage crushing mechanism and the third-stage crushing mechanism. The vertical guiding channel is used to guide the crystals in the transverse guiding channel to the discharge port. At the outlet of the first-stage crushing mechanism, there is a first rotating block. The first rotating block is installed inside the casing and can swing around the horizontal axis. Both first screen plates are connected to the first rotating block. A vibrator is installed inside the casing and is connected to the transverse guide channel. The transverse guide channel is connected to the two first screen plates. The vibrator is also connected to the two second screen plates through two connecting rods. A conveying auger is installed in the transverse guide channel. The conveying auger has an auger shaft, and the end of the auger shaft near the vertical guide channel extends to the outside of the transverse guide channel. A rotating drive is provided on the side of the transverse material guide channel. The rotating output end of the rotating drive is connected to a pressure plate that can reciprocate along the axis of the auger shaft. The pressure plate and the rotating output end of the rotating drive are anti-rotationally engaged so that the rotating drive drives the pressure plate to rotate. A compression spring is connected between the pressure plate and the rotating output end of the rotating drive. The compression spring is in a compressed state and is used to press the pressure plate tightly onto the auger shaft so that when the rotating drive drives the pressure plate to rotate, the pressure plate drives the auger shaft to rotate. At the entrance of the vertical guide channel, there is a push block that can reciprocate along the axis of the auger shaft. A push rod is connected to the push block, and the push rod is connected to the pressure plate. The push block is used to move horizontally under the push of external force. The material squeezes the push block, which drives the push block to move, and the push block drives the push rod to move. A discharge auger is installed in the vertical guide channel. A rotatable transmission wheel is provided on the side of the pressure plate facing away from the auger shaft. The transmission wheel is connected to the discharge auger. The push block is used to drive the push rod to move toward the pressure plate, so as to push the pressure plate to press on the transmission wheel and drive the transmission wheel to rotate, thereby driving the discharge auger to rotate and discharge material.

2. The crushing and screening system for lithium hexafluorophosphate crystals according to claim 1, characterized in that, The second-stage crushing mechanism includes two sets of secondary crushing components arranged at intervals in the horizontal direction. Two first screen plates are provided between the first-stage crushing mechanism and the second-stage crushing mechanism. The two first screen plates are inclined from top to bottom from the outlet of the first-stage crushing mechanism toward the inlet of the corresponding secondary crushing component. The transverse material guide channel is located below the two first screen plates. Two second screen plates are provided between the second-stage crushing mechanism and the third-stage crushing mechanism. The two second screen plates are inclined from top to bottom from the outlet of the corresponding second-stage crushing component toward the inlet of the third-stage crushing mechanism.

3. The crushing and screening system for lithium hexafluorophosphate crystals according to claim 2, characterized in that, Below each of the two second screen plates, there is a set of second guiding components. Each set of second guiding components includes a first guiding plate and a second guiding plate. A V-shaped material dropping space is formed between the first guiding plate and the second guiding plate. The material dropping space is used for qualified lithium hexafluorophosphate crystals screened by the second screen plates to fall into. There is a gap between the bottom end of the first guiding plate and the bottom end of the second guiding plate. The first guiding plate or the second guiding plate is inclined toward the discharge port to guide the lithium hexafluorophosphate crystals in the material dropping space to the discharge port.

4. The crushing and screening system for lithium hexafluorophosphate crystals according to claim 3, characterized in that, The housing contains two second rotating blocks arranged at intervals in the horizontal direction and capable of swinging around the horizontal axis. Two second screen plates are respectively connected to the two second rotating blocks. The guide plate of the first guide plate and the guide plate of the second guide plate that is close to the corresponding second screen plate is connected to the corresponding second rotating block.

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