Grinding mill with separately adjustable grinding plates and cutting plates and grinding process

Abstract

The application discloses a flour mill with separately adjustable grinding disc and cutter disc and a grinding process, which comprises a rack provided with a crushing cavity; a position-adjustable cutter disc is arranged in the crushing cavity; first and second grinding discs are arranged on the two sides of the cutter disc respectively, and the second grinding disc is installed on a closed door in a position-adjustable mode; and a discharging gap is arranged between the first and second grinding discs. On one hand, the position of the second grinding disc is adjusted to adjust the width of the discharging gap, so that the flour mill can obtain plastic powder with different particle sizes after crushing waste plastics, and the diversified crushing requirements are met; on the other hand, the position of the cutter disc is adjusted, so that the cutter disc is arranged between the first and second grinding discs, and the cutter disc is subjected to uniform force during crushing.

Description

Technical Field

[0001] This invention belongs to the field of plastic recycling, specifically relating to a grinding mill and grinding process in which the grinding disc and cutter disc are individually adjustable. Background Technology

[0002] Plastic is a common material in daily life and is widely used in various scenarios. However, plastic items will age and break after prolonged use. To prevent aged and broken plastic items from polluting the environment, it is necessary to recycle them.

[0003] In existing technologies, such as patent document CN214982448U, a crushing device for recycling waste plastics is disclosed. This device includes a crushing chamber with a sieve plate dividing it into an upper and lower chamber. The waste plastics are crushed by arranging stirring blades and crushing rollers in the upper and lower chambers, respectively. However, the gaps between the stirring blades and the inner wall of the upper chamber, and between the crushing rollers, are not adjustable. This means that crushing waste plastics of different materials can only yield one particle size, failing to meet diverse crushing needs when different particle sizes are required based on the plastic material. Summary of the Invention

[0004] To address the problems in the existing technology, this invention proposes a grinding mill and grinding process with independently adjustable grinding disc and cutter disc. By adjusting the position of the second grinding disc, the width of the material drop gap can be adjusted, thereby enabling the grinding mill to obtain different particle sizes and meet diverse pulverization needs.

[0005] The present invention is implemented as follows: a grinding mill with independently adjustable grinding disc and cutter disc, including a frame, the frame having a grinding chamber, a rotating shaft rotatably disposed in the grinding chamber, and a cutter disc disposed on the rotating shaft so that the cutter disc rotates synchronously with the rotating shaft; The cutter disc is adjustable along the axial position of the rotating shaft and is locked in the adjusted axial position; it also includes a first grinding disc and a second grinding disc; the first grinding disc is fixedly disposed in the crushing chamber; the second grinding disc is disposed in the crushing chamber and is spaced apart from the first grinding disc along the axial direction, the axial position of the second grinding disc is adjustable and is locked in the adjusted axial position; the cutter disc is located between the first grinding disc and the second grinding disc. A material drop gap is formed between the first grinding disc and the second grinding disc. A discharge port or discharge channel is provided below the material drop gap. After the material in the crushing chamber is crushed to a size smaller than the material drop gap, it passes through the material drop gap and is discharged from the discharge port or discharge channel. The size of the material drop gap can be changed by adjusting the axial position of the cutter disc and / or the axial position of the second grinding disc individually or in combination. On the one hand, by adjusting the position of the second grinding disc, and thus the width of the material drop gap, the pulverizer can obtain plastic powder of different particle sizes after crushing waste plastic, meeting diverse pulverization needs. On the other hand, by adjusting the position of the cutter disc, which is centrally located between the first and second grinding discs, the cutter disc experiences uniform force during pulverization, reducing wear and ensuring that the plastic to be pulverized is evenly distributed on both sides of the cutter disc, thus improving the pulverization effect.

[0006] Preferably, the grinding chamber has an opening on its side, and a closed door is hinged to the opening. The second grinding disc is installed inside the closed door. The closed door keeps the grinding chamber closed during grinding, preventing plastic fragments from flying and injuring people during the grinding process. At the same time, it also exposes the interior of the grinding chamber when maintenance is required, improving the convenience of maintenance.

[0007] Specifically, the closed door is equipped with a locking component and an adjusting component. The locking component is used to releasably fix the second grinding disc to the closed door, and the adjusting component is used to push the second grinding disc to adjust its axial position relative to the closed door. Normally, the second grinding disc is fixed to the closed door by the locking component. When the second grinding disc needs adjustment, the locking component is loosened to release the second grinding disc, causing it to switch from a fixed state to a movable state, and then the position of the second grinding disc can be adjusted by the adjusting component.

[0008] Specifically, the locking component comprises multiple first fastening units, one end of each first fastening unit passing through the closed door and screwed onto the second grinding disc. Tightening or loosening the first fastening units switches the second grinding disc between a fixed and a movable state. The adjusting component comprises a first adjusting unit screwed onto the closed door, one end of which passes through the closed door and abuts against the second grinding disc. Adjusting the length of the first adjusting unit passing through the closed door adjusts the axial position of the second grinding disc. When adjusting the second grinding disc, first loosen the first fastening units on the closed door to make the second grinding disc movable. Then adjust the length of the first adjusting unit passing through the closed door so that the second grinding disc moves closer to the first grinding disc under the abutment of the first adjusting unit; or create a gap between the second grinding disc and the first adjusting unit, and tighten the second grinding disc by the first fastening unit to abut against the first adjusting unit, thereby moving the second grinding disc away from the first grinding disc.

[0009] Preferably, the closed door is further provided with a scale corresponding to the first adjustment unit, and the first adjustment unit passes through the closed door from the center of the scale. The scale is used to record the adjustment amount of a single first adjustment unit, thereby ensuring that the adjustment amounts of multiple first adjustment units are consistent and improving the adjustment accuracy of the second grinding disc.

[0010] Preferably, the rotating shaft is provided with a limiting boss. The cutter head achieves axial position adjustment and locking through a replaceable shim set located between the limiting boss and one side of the cutter head, and a second fastening unit screwed onto the rotating shaft and pressing against the other side of the cutter head. When adjusting the position of the cutter head, first loosen the second fastening unit, then change the number and specifications of the shims in the shim set according to the distance the cutter head needs to be adjusted, so that the thickness of the shim set reaches the distance between the cutter head and the limiting boss after adjustment, and then tighten the second fastening unit to make the cutter head abut against the shims.

[0011] It also includes a drive mechanism, which is connected to the rotating shaft to drive the rotating shaft to rotate, thereby driving the cutter disc to rotate, and thus crushing the waste plastic in the crushing chamber.

[0012] Preferably, both the first grinding disc and the second grinding disc further include a fixed blade component and a mounting portion corresponding to the fixed blade component. The fixed blade component is provided with a positioning boss on its periphery, and the mounting portion is provided with a first positioning groove corresponding to the positioning boss. The positioning boss is engaged in the first positioning groove. The positioning boss and the first positioning groove are used for positioning when installed on the fixed blade component, which not only improves the installation accuracy of the fixed blade component, but also improves the installation convenience of the fixed blade component.

[0013] Preferably, both the first and second grinding discs have a cutting edge on their fixed blade components. Each cutting edge is inclined outward from the center of the corresponding grinding disc, forming an inverted V-shaped guide on both sides of the material drop gap above the discharge port or discharge channel. The guide causes the crushed plastic particles to move towards the material drop gap, ensuring that the properly crushed plastic particles are discharged from the crushing chamber in a timely manner. This prevents the properly crushed plastic particles from being over-crushed, ensuring the crushing effect of the crushing chamber. Furthermore, after the properly crushed plastic particles are discharged from the crushing chamber, uncrushed waste plastic can promptly enter the crushing chamber, improving crushing efficiency.

[0014] Specifically, the cutter disc includes multiple evenly distributed mounting plates arranged radially, each with a detachably connected blade at its end. The blade has a symmetrical structure and two cutting edges, the shape of which is adapted to the guide portion. One cutting edge extends outward along the extension direction of the mounting plate, while the other extends inward, allowing only one blade to simultaneously crush the waste plastic in the crushing chamber. By providing two cutting edges, the blade can be reused, thus increasing its service life and reducing subsequent maintenance costs.

[0015] Specifically, the mounting plate has a second positioning groove at its end, the blade is installed in the second positioning groove, and the side wall of the second positioning groove abuts against the blade, making the blade more stable during the crushing of plastic and improving the stability of the blade. The second positioning groove is also provided with a clearance portion corresponding to the inwardly facing blade, and the inwardly facing blade is located within the clearance portion. The clearance portion is used to avoid the inwardly facing blade, thereby preventing the inwardly facing blade from being worn by vibration during blade crushing before use.

[0016] Preferably, the frame is further provided with a bearing housing assembly that is rotatably sleeved with the rotating shaft. The bearing housing assembly includes a base body, and the outer periphery of the base body is provided with multiple heat dissipation grooves. The bearing housing assembly is used to mount the rotating shaft, making the rotation of the rotating shaft smoother. Since the rotating shaft generates heat when rotating, the heat dissipation grooves increase the heat dissipation area of ​​the bearing housing assembly, facilitating heat dissipation and thus extending the service life of the bearing housing assembly.

[0017] The bearing housing has a lubrication cavity inside, with oil baffles at both ends. The outer periphery of the oil baffles near the inner wall of the lubrication cavity has a wavy texture. The bearing housing also has multiple oil injectors, which communicate with the lubrication cavity. The lubrication cavity holds lubricating oil, allowing the shaft to rotate smoothly for extended periods. The oil injectors periodically inject lubricating oil into the lubrication cavity, ensuring a constant supply and improving the reliability of the bearing housing assembly. The oil baffles prevent foreign objects from entering the lubrication cavity and also prevent lubricating oil leakage. The wavy texture forms multiple lubrication grooves between the oil baffles and the lubrication cavity. The oil baffles are fitted onto the shaft; when the shaft rotates, the oil baffles rotate. The lubrication grooves store lubricating oil, reducing wear on the oil baffles and extending their service life.

[0018] Preferably, the first and second grinding discs are further provided with cooling chambers. Each cooling chamber is arranged adjacent to the fixed blade component of the corresponding grinding disc and is thermally connected to the corresponding fixed blade component. The liquid inlet of each cooling chamber is located at the bottom of the cooling chamber, and the liquid outlet of each cooling chamber is located at the top of the cooling chamber, so that the coolant in each cooling chamber flows from bottom to top. Since the first and second grinding discs generate heat through friction with the waste plastic in the grinding chamber during the crushing process, the fixed blade component heats up, making it more prone to wear. Each cooling chamber is used to cool the corresponding fixed blade component, preventing the fixed blade component from overheating, thereby reducing the wear of each fixed blade component and extending its service life.

[0019] Preferably, the closed door is provided with a feeding channel, which includes an outlet end communicating with the crushing chamber. The outlet end faces the middle of the cutter disc, which prevents waste plastic from hitting the blades of the cutter disc when feeding, thereby reducing the wear of the blades and improving the service life of the blades.

[0020] A grinding process is applied to the aforementioned grinding mill. The cutter disc includes multiple evenly distributed mounting plates, each mounting plate having a detachably connected blade at its end. The blade includes symmetrically arranged cutting edges. An opening is provided on the side of the grinding chamber, and a closed door is hinged to the opening. The closed door is provided with multiple first fastening units and first adjusting units. A limiting boss is provided on the rotating shaft, and a replaceable gasket set is provided between the limiting boss and one side of the cutter disc. The rotating shaft is also provided with a second fastening unit that presses against the other side of the cutter disc. The grinding process includes the following steps: S1: Determine the type of plastic to be crushed and the required particle size after crushing; S2: Adjust the width of the material feeding gap according to the required particle size after crushing; S2-1: Determine the width of the existing material drop gap, calculate the amount of change that the second grinding disc needs to be adjusted, and divide the amount of change that needs to be adjusted into multiple adjustment amounts for single adjustments. S2-2: Loosen the fastening unit, and then adjust multiple first adjustment units in sequence according to the adjustment amount; S2-3: After all the first adjustment units have been adjusted to one adjustment amount, adjust multiple first adjustment units in sequence according to the adjustment amount until all the multiple adjustment amounts that are evenly distributed in the change amount have been adjusted. Then tighten the fastening unit again. S3: Adjust the position of the cutter head so that it is centered between the first grinding disc and the second grinding disc; S3-1: Calculate the displacement of the cutter head based on the change in the second grinding disc; S3-2: Loosen the second fastening unit, and change the specifications and quantity of the shims according to the displacement, so that the change in the thickness of the shim group is equal to the displacement of the cutter head; S3-3: Tighten the second fastening unit so that the second fastening unit, the cutter head and the gasket press against each other in sequence; S4: Start the drive mechanism, and then put the waste plastic to be recycled into the crushing chamber. The drive mechanism drives the cutter disc to rotate, crushing the waste plastic in the crushing chamber into a size that can pass through the material drop interval. S5: Perform maintenance on the blades after crushing; S5-1: After crushing, check the wear of the blade. When the wear of the blade reaches the preset level, change the orientation of the blade so that the unworn blade is in the working position. S5-2: Replace the blade when both cutting edges are worn.

[0021] The beneficial effects of this invention are: This invention proposes a grinding mill and grinding process with independently adjustable grinding discs and cutter discs. On one hand, by adjusting the position of the second grinding disc, the width of the material feeding gap can be adjusted, enabling the grinding mill to obtain plastic powder of different particle sizes after crushing waste plastics, thus meeting diverse crushing needs. On the other hand, by adjusting the position of the cutter disc, which is centrally located between the first and second grinding discs, the cutter disc is subjected to uniform force during crushing, reducing wear on the cutter disc and ensuring that the plastic to be crushed is evenly distributed on both sides of the cutter disc, thereby improving the crushing effect. Attached Figure Description

[0022] Figure 1 This is an overall schematic diagram of the grinding mill of the present invention; Figure 2 This is a cross-sectional view of the grinding mill of the present invention; Figure 3 This is a schematic diagram of the cutter head installation of the grinding mill of the present invention; Figure 4 This is a schematic diagram of the inside of the grinding chamber of the grinding mill of the present invention; Figure 5 This is a schematic diagram of the closed door of the grinding mill of the present invention; Figure 6 This is a schematic diagram of the cutter head of the grinding mill of the present invention.

[0023] Figure label: 1. Frame; 2. Crushing chamber; 3. Enclosed door; 4. Drive component; 5. Rotating shaft; 6. Cutter disc; 7. Bearing housing assembly; 21. Discharge channel; 22. First grinding disc; 31. Feed channel; 32. Second grinding disc; 33. Cooling chamber; 34. Liquid injection port; 35. Liquid outlet; 36. First fastening unit; 37. First adjustment unit; 38. Dial; 51. Second fastening unit; 52. Gasket assembly; 61. Mounting plate; 62. Blade; 71. Lubrication chamber; 72. Oil injector; 221. Fixed blade component; 222. First positioning groove; 223. Positioning boss; 611. Second positioning groove; 612. Clearance part; 621. Blade. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0025] Example 1 like Figures 1-6 As shown, a grinding mill with independently adjustable grinding disc and cutter disc includes a frame 1, the frame 1 is provided with a grinding chamber 2, a rotating shaft 5 is rotatably arranged in the grinding chamber 2, and a cutter disc 6 is provided on the rotating shaft 5 so that the cutter disc 6 rotates synchronously with the rotating shaft 5; Specifically, the blade disc 6 includes multiple evenly distributed mounting plates 61 arranged radially, with each mounting plate 61 having a detachably connected blade 62 at its end. The blade 62 has a symmetrical structure and two cutting edges 621. The shape of the cutting edges 621 is adapted to the guide portion, with one cutting edge 621 extending outward along the extension direction of the mounting plate 61, and the other cutting edge 621 extending inward along the extension direction of the mounting plate 61. This allows only one cutting edge 621 of each blade 62 to simultaneously crush the waste plastic in the crushing chamber 2. By providing two cutting edges 621 on each blade 62, the blade 62 can be reused, thereby increasing its service life and reducing subsequent maintenance costs.

[0026] Specifically, the mounting plate 61 has a second positioning groove 611 at its end, the blade 62 is installed in the second positioning groove 611, and the side wall of the second positioning groove 611 abuts against the blade 62, making the blade 62 more stable during the crushing of plastic and improving the stability of the blade 62. The second positioning groove 611 is also provided with a relief part 612 corresponding to the inwardly facing blade 621, and the inwardly facing blade 621 is located in the relief part 612. The relief part 612 is used to avoid the inwardly facing blade 621, thereby preventing the inwardly facing blade 621 from being worn by vibration when the blade 62 is crushed before use.

[0027] The cutter disc 6 is adjustable along the axial position of the rotating shaft 5 and is locked in the adjusted axial position; it also includes a first grinding disc 22 and a second grinding disc 32; the first grinding disc 22 is fixedly disposed in the crushing chamber 2; the second grinding disc 32 is disposed in the crushing chamber 2 and is axially spaced from the first grinding disc 22, the axial position of the second grinding disc 32 is adjustable and is locked in the adjusted axial position; the cutter disc 6 is located between the first grinding disc 22 and the second grinding disc 32; Both the first grinding disc 22 and the second grinding disc 32 further include a fixed blade component 221 and a mounting portion corresponding to the fixed blade component 221. The fixed blade component 221 has a positioning boss 223 on its periphery, and the mounting portion has a first positioning groove 222 corresponding to the positioning boss 223. The positioning boss 223 is engaged in the first positioning groove 222. The positioning boss 223 and the first positioning groove 222 are used for positioning when installed on the fixed blade component 221, which not only improves the installation accuracy of the fixed blade component 221, but also improves the installation convenience of the fixed blade component 221.

[0028] In this embodiment, the fixed blade components 221 of both the first grinding disc 22 and the second grinding disc 32 are provided with cutting edges. Each cutting edge is inclined outward from the center of the corresponding grinding disc, forming an inverted V-shaped guide portion on both sides of the material drop gap above the discharge port or discharge channel 21. The guide portion moves the crushed plastic particles towards the material drop gap, allowing the properly crushed plastic particles to be discharged from the crushing chamber 2 in a timely manner. On the one hand, this prevents the properly crushed plastic particles from being over-crushed, ensuring the crushing effect of the crushing chamber 2; on the other hand, after the properly crushed plastic particles are discharged from the crushing chamber 2, the uncrushed waste plastic can enter the crushing chamber 2 in a timely manner, improving the crushing efficiency.

[0029] In this embodiment, the first and second grinding discs are further provided with cooling chambers 33. Each cooling chamber is arranged adjacent to the fixed blade component 221 of the corresponding grinding disc and is heat-transfer connected to the corresponding fixed blade component 221. The liquid inlet 34 of each cooling chamber 33 is located at the bottom of the cooling chamber 33, and the liquid outlet 35 of each cooling chamber 33 is located at the top of the cooling chamber 33, so that the coolant in each cooling chamber 33 flows from bottom to top. Since the first and second grinding discs 22 and 32 generate heat through friction with the waste plastic in the grinding chamber 2 during the crushing process, the fixed blade component 221 will heat up, making the fixed blade component 221 more prone to wear. Each cooling chamber 33 is used to cool down the corresponding fixed blade component 221, preventing the fixed blade component 221 from overheating, thereby reducing the wear of each fixed blade component 221 and extending the service life of each fixed blade component 221.

[0030] A material drop gap is formed between the first grinding disc 22 and the second grinding disc 32. A material discharge channel 21 is provided below the material drop gap. After the material in the crushing chamber 2 is crushed to a size smaller than the material drop gap, it passes through the material drop gap and is discharged through the material discharge channel 21. The size of the material discharge gap can be changed by adjusting the axial position of the cutter disc 6 and / or the axial position of the second grinding disc 32 individually or in combination. On the one hand, by adjusting the position of the second grinding disc 32, and thus the width of the material discharge gap, the pulverizer can obtain plastic powder of different particle sizes after crushing waste plastic, meeting diverse pulverization needs. On the other hand, by adjusting the position of the cutter disc 6, which is centrally located between the first grinding disc 22 and the second grinding disc 32, the cutter disc 6 is subjected to uniform force during pulverization, reducing wear on the cutter disc 6 and ensuring that the plastic to be pulverized is evenly distributed on both sides of the cutter disc 6, thereby improving the pulverization effect.

[0031] In this embodiment, the grinding chamber 2 has an opening on its side, and a closed door 3 is hinged to the opening. The second grinding disc 32 is installed inside the closed door 3. The closed door 3 keeps the grinding chamber 2 in a closed state during grinding, preventing plastic fragments from flying and injuring people during the grinding process; at the same time, it can also expose the interior of the grinding chamber 2 when maintenance is required, improving the convenience of maintenance of the grinding chamber 2.

[0032] Specifically, the closed door 3 is provided with a locking component and an adjusting component. The locking component is used to releasably fix the second grinding disc 32 to the closed door 3, and the adjusting component is used to push the second grinding disc 32 to adjust its axial position relative to the closed door 3.

[0033] Specifically, the locking component consists of multiple first fastening units 36, one end of each first fastening unit 36 ​​passing through the closed door 3 and screwed onto the second grinding disc 32. By tightening or loosening the first fastening unit 36, the second grinding disc 32 can be switched between a fixed state and a movable state. The adjusting component consists of a first adjusting unit 37 screwed onto the closed door 3, one end of which passes through the closed door 3 and abuts against the second grinding disc 32. By adjusting the length of the first adjusting unit 37 passing through the closed door 3, the axial position of the second grinding disc 32 can be adjusted. When adjusting the second grinding disc 32, first loosen the first fastening unit 36 ​​on the closed door 3 to make the second grinding disc 32 movable. Then adjust the length of the first adjusting unit 37 passing through the closed door 3 so that the second grinding disc 32 moves closer to the first grinding disc 22 under the abutment of the first adjusting unit 37; or make a gap between the second grinding disc 32 and the first adjusting unit 37, and tighten the second grinding disc 32 by the first fastening unit 36 ​​so that the second grinding disc 32 abuts against the first adjusting unit 37, thereby moving the second grinding disc 32 away from the first grinding disc 22.

[0034] In this embodiment, the closed door 3 is also provided with a scale 38 corresponding to the first adjustment unit 37, and the first adjustment unit 37 passes through the closed door 3 from the center of the scale 38. The scale 38 is used to record the adjustment amount of a single first adjustment unit 37, thereby ensuring that the adjustment amounts of multiple first adjustment units 37 are consistent and improving the adjustment accuracy of the second grinding disc 32.

[0035] In this embodiment, the closed door 3 is provided with a feeding channel 31, which includes an outlet end communicating with the crushing chamber 2. The outlet end faces the middle of the cutter disc 6, which avoids waste plastic hitting the blades 62 of the cutter disc 6 when feeding, thereby reducing the wear of the blades 62 and improving the service life of the blades 62.

[0036] In this embodiment, the rotating shaft 5 is provided with a limiting boss. The cutter head 6 achieves axial position adjustment and locking through a replaceable shim set 52 located between the limiting boss and one side of the cutter head 6, and a second fastening unit 51 screwed onto the rotating shaft 5 and pressing against the other side of the cutter head 6. When adjusting the position of the cutter head 6, first loosen the second fastening unit 51, then change the number and specifications of the shims in the shim set 52 according to the distance that the cutter head 6 needs to be adjusted, so that the thickness of the shim set 52 reaches the distance between the cutter head 6 and the limiting boss after adjustment, and then tighten the second fastening unit 51 so that the cutter head 6 abuts against the shims.

[0037] It also includes a drive mechanism, which is connected to the rotating shaft 5 to drive the rotating shaft 5 to rotate, thereby driving the cutter disc 6 to rotate, and thus crushing the waste plastic in the crushing chamber 2.

[0038] In this embodiment, the frame 1 is further provided with a bearing housing assembly 7 that is rotatably sleeved with the rotating shaft 5. The bearing housing assembly 7 includes a base body, and the outer periphery of the base body is provided with multiple heat dissipation grooves. The bearing housing assembly 7 is used to mount the rotating shaft 5, making the rotation of the rotating shaft 5 smoother. Since the rotating shaft 5 generates heat when rotating, the heat dissipation grooves increase the heat dissipation area of ​​the bearing housing assembly 7, facilitating heat dissipation of the bearing housing assembly 7 and thus extending the service life of the bearing housing assembly 7.

[0039] The bearing housing has a lubrication cavity 71 inside, and oil baffles are provided at both ends of the lubrication cavity 71. The outer periphery of the oil baffles near the inner wall of the lubrication cavity 71 has a wavy texture. The bearing housing is also provided with multiple oil injectors 72, which are connected to the lubrication cavity 71. The lubrication cavity 71 is used to contain lubricating oil, allowing the rotating shaft 5 to rotate smoothly for a long time. The oil injectors 72 are used to periodically inject lubricating oil into the lubrication cavity 71, ensuring that there is always lubricating oil in the lubrication cavity 71, thus improving the reliability of the bearing housing assembly 7. The oil baffles are used to prevent foreign objects from entering the lubrication cavity 71 and also to prevent the lubricating oil in the lubrication cavity 71 from leaking out. The wavy texture forms multiple lubrication grooves between the oil baffles and the lubrication cavity 71. The oil baffles are sleeved on the rotating shaft 5. When the rotating shaft 5 rotates, it may drive the oil baffles to rotate. The lubrication grooves store lubricating oil. When the oil baffles rotate, the wear of the oil baffles is reduced, extending the service life of the oil baffles.

[0040] Example 2 A grinding process is applied to the grinding mill described in Example 1. The cutter disc 6 includes multiple evenly distributed mounting plates 61. Each mounting plate 61 has a detachably connected blade 62 at its end. The blade 62 includes symmetrically arranged cutting edges 621. An opening is provided on the side of the grinding chamber 2, and a closed door 3 is hinged to the opening. The closed door 3 is provided with multiple first fastening units 36 and first adjusting units 37. A limiting boss is provided on the rotating shaft 5. A replaceable gasket set 52 is provided between the limiting boss and one side of the cutter disc 6. The rotating shaft 5 is also provided with a second fastening unit 51 that presses the other side of the cutter disc 6. The grinding process includes the following steps: S1: Determine the type of plastic to be crushed and the required particle size after crushing; S2: Adjust the width of the material feeding gap according to the required particle size after crushing; S2-1: Determine the width of the existing material drop gap, calculate the amount of change that the second grinding disc 32 needs to be adjusted, and divide the amount of change that needs to be adjusted into multiple adjustment amounts for single adjustments. S2-2: Loosen the fastening unit, and then adjust the plurality of first adjustment units 37 in sequence according to the adjustment amount; S2-3: After all the first adjustment units 37 have adjusted one adjustment amount, adjust multiple first adjustment units 37 in sequence according to the adjustment amount until all the multiple adjustment amounts that are evenly distributed by the change amount have been adjusted, and then tighten the fastening unit again. S3: Adjust the position of the cutter head 6 so that the cutter head 6 is centered between the first grinding disc 22 and the second grinding disc 32; S3-1: Calculate the displacement of the cutter head 6 based on the change in the second grinding disc 32; S3-2: Loosen the second fastening unit 51, and change the specifications and quantity of the shims according to the displacement, so that the change in the thickness of the shim group 52 is equal to the displacement of the cutter head 6. S3-3: Tighten the second fastening unit 51 so that the second fastening unit 51, the cutter head 6 and the gasket press against each other in sequence; S4: Start the drive mechanism, and then put the waste plastic to be recycled into the crushing chamber 2. The drive mechanism drives the cutter disc 6 to rotate, crushing the waste plastic in the crushing chamber 2 into a size that can pass through the material drop interval. S5: Perform maintenance on blade 62 after crushing; S5-1: After crushing, check the wear of the blade 621. When the wear of the blade 621 reaches the preset level, change the orientation of the blade 621 so that the unworn blade 621 is in the working position. S5-2: Replace blade 62 when both cutting edges 621 of blade 62 are worn.

[0041] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A grinding mill with independently adjustable grinding disc and cutter disc, comprising a frame, the frame having a grinding chamber, a rotating shaft rotatably disposed within the grinding chamber, and a cutter disc mounted on the rotating shaft to allow the cutter disc to rotate synchronously with the rotating shaft; characterized in that: The cutter disc is adjustable along the axial position of the rotating shaft and is locked in the adjusted axial position; it also includes a first grinding disc and a second grinding disc; the first grinding disc is fixedly disposed in the crushing chamber; the second grinding disc is disposed in the crushing chamber and is spaced apart from the first grinding disc along the axial direction, the axial position of the second grinding disc is adjustable and is locked in the adjusted axial position; the cutter disc is located between the first grinding disc and the second grinding disc. A material drop gap is formed between the first grinding disc and the second grinding disc. A discharge port or discharge channel is provided below the material drop gap. After the material in the crushing chamber is crushed to a size smaller than the material drop gap, it passes through the material drop gap and is discharged from the discharge port or discharge channel. The size of the material drop gap can be changed by adjusting the axial position of the cutter head and / or the axial position of the second grinding disc individually or in combination.

2. The grinding mill with individually adjustable grinding disc and cutter disc according to claim 1, characterized in that: An opening is provided on the side of the grinding chamber, and a closed door is hinged to the opening. The second grinding disc is installed inside the closed door.

3. The grinding mill with individually adjustable grinding disc and cutter disc according to claim 2, characterized in that: The closed door is provided with a locking component and an adjusting component. The locking component is used to releasably fix the second grinding disc to the closed door, and the adjusting component is used to push the second grinding disc to adjust its axial position relative to the closed door.

4. The grinding mill with individually adjustable grinding disc and cutter disc according to claim 3, characterized in that: The locking component consists of multiple first fastening units, one end of each first fastening unit passing through the closed door and screwed onto the second grinding disc. By tightening or loosening the first fastening unit, the second grinding disc can be switched between a fixed state and a movable state. The adjusting component consists of a first adjusting unit screwed onto the closed door, one end of which passes through the closed door and abuts against the second grinding disc. By adjusting the length of the first adjusting unit passing through the closed door, the axial position of the second grinding disc can be adjusted. The closed door is also provided with a dial corresponding to the first adjustment unit, and the first adjustment unit passes through the closed door from the center of the dial.

5. The grinding mill with individually adjustable grinding disc and cutter disc according to claim 1, characterized in that: The rotating shaft is provided with a limiting boss. The cutter head can be adjusted and locked in axial position by a replaceable shim set located between the limiting boss and one side of the cutter head, and a second fastening unit screwed onto the rotating shaft and pressing against the other side of the cutter head.

6. A grinding mill with individually adjustable grinding disc and cutter disc according to claim 1, characterized in that: Both the first grinding disc and the second grinding disc further include a fixed blade component and a mounting part corresponding to the fixed blade component. The fixed blade component is provided with a positioning boss on its periphery, and the mounting part is provided with a first positioning groove corresponding to the positioning boss. The positioning boss is engaged in the first positioning groove. Both the first and second grinding discs have a cutting edge on their fixed blade components. Each cutting edge is inclined outward from the center of the corresponding grinding disc, so that the material discharge gap above the discharge port or discharge channel forms an inverted V-shaped guide.

7. A grinding mill with individually adjustable grinding disc and cutter disc according to claim 6, characterized in that: The blade disc includes multiple evenly distributed mounting plates arranged radially, and each mounting plate has a detachably connected blade at its end. The blade has a symmetrical structure and two cutting edges. The shape of the cutting edges is adapted to the guide portion. One cutting edge is set outward along the extension direction of the mounting plate, and the other cutting edge is set inward along the extension direction of the mounting plate, so that the blade can crush the waste plastic in the crushing chamber with only one cutting edge at a time. The mounting plate has a second positioning groove at its end, the blade is installed in the second positioning groove, and the side wall of the second positioning groove abuts against the blade; the second positioning groove also has a relief part corresponding to the inwardly facing blade, and the inwardly facing blade is located in the relief part.

8. A grinding mill with individually adjustable grinding disc and cutter disc according to claim 1, characterized in that: The frame is also provided with a bearing housing assembly that is rotatably sleeved with the rotating shaft. The bearing housing assembly includes a housing body, and the outer periphery of the housing body is provided with multiple heat dissipation grooves. The housing body is provided with a lubrication cavity, and the two ends of the lubrication cavity are provided with oil baffles.

9. A grinding mill with individually adjustable grinding disc and cutter disc according to claim 1, characterized in that: The first and second grinding discs are also provided with cooling chambers. Each cooling chamber is arranged adjacent to the fixed blade component of the corresponding grinding disc and is thermally connected to the corresponding fixed blade component. The liquid injection port of each cooling chamber is located at the bottom of the cooling chamber, and the liquid outlet of each cooling chamber is located at the top of the cooling chamber, so that the coolant in each cooling chamber flows from bottom to top.

10. A grinding process applied to the grinding mill according to any one of claims 1-9, wherein the cutter disc includes a plurality of uniformly distributed mounting plates, each mounting plate having a detachably connected blade at its end, the blade having symmetrically arranged cutting edges; an opening is provided on the side of the grinding chamber, a closed door is hinged to the opening, the closed door is provided with a plurality of first fastening units and a first adjusting unit, a limiting boss is provided on the rotating shaft, a replaceable gasket set is provided between the limiting boss and one side of the cutter disc, and a second fastening unit is also provided on the rotating shaft to press against the other side of the cutter disc; characterized in that: The grinding process includes the following steps: S1: Determine the type of plastic to be crushed and the required particle size after crushing; S2: Adjust the width of the material feeding gap according to the required particle size after crushing; S2-1: Determine the width of the existing material drop gap, calculate the amount of change that the second grinding disc needs to be adjusted, and divide the amount of change that needs to be adjusted into multiple adjustment amounts for single adjustments. S2-2: Loosen the first fastening unit, and then adjust multiple first adjustment units in sequence according to the adjustment amount; S2-3: After all the first adjustment units have been adjusted to one adjustment amount, adjust multiple first adjustment units in sequence according to the adjustment amount until all the multiple adjustment amounts that are evenly distributed by the change amount have been adjusted, and then tighten the first fastening unit again. S3: Adjust the position of the cutter head so that it is centered between the first grinding disc and the second grinding disc; S3-1: Calculate the displacement of the cutter head based on the change in the second grinding disc; S3-2: Loosen the second fastening unit, and change the specifications and quantity of the shims according to the displacement, so that the change in the thickness of the shim group is equal to the displacement of the cutter head; S3-3: Tighten the second fastening unit so that the second adjusting unit, cutter head and gasket group press against it in sequence; S4: Start the drive mechanism, and then put the waste plastic to be recycled into the crushing chamber. The drive mechanism drives the cutter disc to rotate, crushing the waste plastic in the crushing chamber into a size that can pass through the material drop interval. S5: Perform maintenance on the blades after crushing; S5-1: After crushing, check the wear of the blade. When the wear of the blade reaches the preset level, change the orientation of the blade so that the unworn blade is in the working position. S5-2: Replace the blade when both cutting edges are worn.

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