Permanent magnet direct-drive granulator with compact structure

Abstract

The utility model provides a compact-structure permanent-magnet direct-drive granulator. The compact-structure permanent-magnet direct-drive granulator comprises a permanent-magnet motor, a pressing wheel seat, a plurality of pressing wheel structures rotationally connected to the pressing wheel seat, a ring die arranged on the outer side of the pressing wheel seat in a sleeving manner, a scraper assembly arranged on the outer side of the ring die, a material cover structure arranged above the scraper assembly and a gear driving mechanism connected with the scraper assembly, the permanent magnet motor comprises a stator, a rotor and a main shaft, the main shaft is coaxially connected with a bearing, the bearing is fixed on a bearing seat, and the top end of the main shaft is coaxially and fixedly connected with a pinch roller seat; the circular mold is horizontally positioned on the first supporting ring, the first supporting ring is fixed to the second supporting ring, and the scraper assembly is movably connected to the outer side of the second supporting ring. According to the permanent magnet direct-drive granulator with the compact structure, a speed reducing mechanism is omitted, the structure of an existing granulator is compact, the occupied area of existing equipment is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of pellet mill technology, specifically relating to a compact permanent magnet direct drive pellet mill. Background Technology

[0002] Energy conservation and environmental protection are key concerns worldwide. Therefore, high-efficiency, innovative, energy-saving, and environmentally friendly products have become a primary research focus. A biofuel pellet mill is a device used to compress biomass materials such as wood chips, straw, and rice husks into pellet fuel. By feeding the raw materials into a pressure chamber inside the equipment, they are compressed into pellets under high pressure. Biofuel pellets can serve as an alternative to traditional petroleum fuels, offering advantages such as high calorific value and low pollution.

[0003] However, existing straw pellet mills have the following technical problems in production, manufacturing, and application:

[0004] (1) The overall size of the equipment is large and the structure is not compact, resulting in an increase in the floor space occupied and a decrease in work efficiency;

[0005] (2) Currently, pellet mills generally use a motor to drive the pressure roller seat to rotate. The motor is connected to the pressure roller seat through a reduction mechanism. The design of the reduction mechanism will increase wear and lubricant consumption, resulting in technical problems such as low operating stability and large rotation fluctuation.

[0006] This solution proposes a compact permanent magnet direct-drive pellet mill to address the aforementioned technical problems. Utility Model Content

[0007] The purpose of this invention is to provide a compact permanent magnet direct drive pellet mill, which solves the technical problem of how to eliminate the deceleration mechanism and make the existing pellet mill compact, thereby reducing the floor space of the existing equipment and increasing production efficiency.

[0008] A compact permanent magnet direct-drive pellet mill includes a permanent magnet motor, a pressure roller base, multiple pressure roller structures rotatably connected to the pressure roller base, a ring die sleeved on the outside of the pressure roller base, a scraper assembly disposed on the outside of the ring die, a material cover structure disposed above the scraper assembly, and a gear drive mechanism connected to the scraper assembly.

[0009] The permanent magnet motor includes a stator, a rotor, and a main shaft. The main shaft is coaxially connected to a bearing, the bearing is fixed on a bearing housing, and the top end of the main shaft is coaxially and fixedly connected to the pressure roller housing.

[0010] The ring mold is horizontally positioned on support ring one, support ring one is fixed on support ring two, and the scraper assembly is movably connected to the outside of support ring two.

[0011] The pressure roller structure includes two pressure rollers rotatably disposed on both sides of the pressure roller seat, a wheel axle coaxially passing through the pressure rollers, and an upper eccentric shaft and a lower eccentric shaft eccentrically connected to the upper and lower ends of the wheel axle, respectively. The lower eccentric shaft is fixedly connected to the pressure roller seat, and the upper eccentric shaft is fixedly connected to the top plate of the pressure roller.

[0012] A gap is provided between the outer side of the pressure roller and the inner side of the ring mold.

[0013] The scraper assembly includes a rotating ring plate, on the inner side of which positioning plates are fixed in a circular array. The positioning plates are fixedly connected to the cutting blade, which is located near the outer side of the ring mold. The bottom end of the rotating ring plate is connected to a gear drive mechanism.

[0014] The gear drive mechanism includes a ring gear coaxially fixed to the bottom surface of the rotating ring plate, a drive gear meshing with the outer side of the ring gear, a bevel gear assembly connected to the drive gear, and a drive motor connected to the bevel gear assembly.

[0015] The upper surface of the rotating ring plate is flush with the upper surface of the support ring, and the contact position of the two is perfectly sealed.

[0016] The material hood structure includes a closed ring plate disposed outside the rotating ring plate, a discharge cylinder connected and fixed outside the closed ring plate, a guide plate disposed near the inlet of the discharge cylinder, a top cover coaxially disposed above the closed ring plate, and a feed cylinder connected to the top cover.

[0017] An annular seat is provided on the lower outer side of the pressure roller seat, and a receiving space is provided on the outer side of the pressure roller seat and the inner side of the annular seat. The receiving space is connected to the vacuum suction assembly.

[0018] This utility model achieves the following significant technical effects:

[0019] (1) The reduction mechanism is directly omitted in this scheme. The permanent magnet motor is directly connected to the pressure roller seat, which reduces the wear of the equipment and the consumption of lubricating oil. The overall structure is compact and the floor space is reduced.

[0020] (2) Under the combined action of the bearing housing and the ring die, the main shaft of the permanent magnet motor runs smoothly. Since the ring die not only has the function of discharging granules, it also indirectly plays the role of limiting the pressure roller. There is a gap between the pressure roller and the ring die, and there is material in the gap, which allows the ring die to buffer the pressure roller, improve stability, and avoid the technical problem of large fluctuations in the rotation of the pressure roller. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the pellet mill in this utility model.

[0022] Figure 2 This is a front view of the pellet mill in this utility model.

[0023] Figure 3 This is a schematic diagram of the installation structure of the ring molding wheel structure of this utility model.

[0024] Figure 4 This is a schematic diagram of the internal structure of the pellet mill in this utility model.

[0025] Figure 5 This is a schematic diagram of the pressure wheel structure of this utility model.

[0026] Figure 6 This is a schematic diagram of the pressure wheel structure of this utility model.

[0027] The attached diagram is labeled as follows: 1. Base plate; 2. Outer shell; 3. Fixing plate; 31. Annular seat; 32. Suction cylinder; 4. Side end cover; 5. Closed ring plate; 6. Feed cylinder; 7. Drive motor; 8. Discharge cylinder; 9. Ring mold; 10. Pressure roller top plate; 11. Pressure roller; 111. Wheel axle; 112. Lower eccentric shaft; 113. Upper eccentric shaft; 12. Material cutter; 13. Rotating ring plate; 131. Ring gear; 14. Support ring II; 15. Main shaft. Detailed Implementation

[0028] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0029] See Figures 1-6 A compact permanent magnet direct-drive pellet mill includes a permanent magnet motor, a pressure roller seat, multiple pressure roller structures rotatably connected to the pressure roller seat, a ring die 9 sleeved on the outside of the pressure roller seat, a scraper assembly disposed on the outside of the ring die 9, a material cover structure disposed above the scraper assembly, and a gear drive mechanism connected to the scraper assembly.

[0030] The permanent magnet motor includes a stator, a rotor, and a main shaft. The main shaft is coaxially connected to the bearing, the bearing is fixed on the bearing housing, and the top end of the main shaft is coaxially and fixedly connected to the pressure roller housing.

[0031] The ring mold 9 is horizontally positioned on the first support ring, the first support ring is fixed on the second support ring 14, and the scraper assembly is movably connected to the outside of the first support ring.

[0032] Specifically, the permanent magnet motor is fixed on the base plate 1, and the outer shell 2 is provided above the base plate. The top of the outer shell 2 is provided with a fixing plate 3. A side end cover 4 is provided on the outside of the outer shell 2, which can be opened for maintenance. The bearing seat is fixed inside the outer shell 2.

[0033] The support ring 1 and support ring 2 14 described in this solution mainly serve a supporting function; their specific structure is not limited, and in practical applications, they are not limited to ring-type structures, such as cylindrical or cylindrical structures.

[0034] The pressure roller structure includes two pressure rollers 11 rotatably mounted on both sides of the pressure roller seat, a wheel axle 111 coaxially passing through the pressure rollers 11, and an upper eccentric shaft 113 and a lower eccentric shaft 112 eccentrically connected to the upper and lower ends of the wheel axle 111, respectively. The lower eccentric shaft 112 is fixedly connected to the pressure roller seat, and the upper eccentric shaft 113 is fixedly connected to the pressure roller top plate 10.

[0035] It should be noted that the lower eccentric shaft 112 and the upper eccentric shaft 113 are provided primarily to facilitate the adjustment of the distance between the pressure roller 11 and the ring die 9. This means that by manually using external tools to rotate the lower eccentric shaft 112 and the upper eccentric shaft by a certain angle, the distance between the pressure roller and the ring die can be adjusted. Therefore, in actual use, the lower eccentric shaft 112 is fixedly connected to the pressure roller seat, and the upper eccentric shaft 113 is fixedly connected to the pressure roller top plate 10. The upper and lower eccentric shafts cannot rotate arbitrarily; otherwise, under the high-speed rotation of the pressure roller 11, they may collide with the inner wall of the ring die.

[0036] The fixing method of the lower eccentric shaft 112 to the pressure roller seat and the fixing method of the upper eccentric shaft 113 to the pressure roller top plate 10 can be fixed by bolts. The small end of the bolt passes through the pressure roller seat or the pressure roller top plate 10 and is coaxially connected to the end of the lower eccentric shaft 112 or the upper eccentric shaft 113. This will not be described in detail here.

[0037] A gap is provided between the outer side of the pressure roller 11 and the inner side of the ring die 9. The material enters the gap and, under continuous and strong extrusion, passes through the ring die and is cut into pellet feed.

[0038] The scraper assembly includes a rotating ring plate 13. Positioning plates are fixed in a ring array on the inner side of the rotating ring plate 13. The positioning plates are fixedly connected to the cutting blade 12. The cutting blade 12 is located close to the outer side of the ring mold 9. The bottom end of the rotating ring plate 13 is connected to a gear drive mechanism.

[0039] Driven by the gear drive mechanism, the rotating ring plate 13 rotates, which in turn drives the positioning plate and the cutting blade 12 to rotate. The cutting blade 12 cuts the strip-shaped material extruded from the outer side of the ring die 9 into granular feed pellets. It should be noted that the inner side of the rotating ring plate 13 is close to the outer side of the support ring 1, and the two fit together to prevent the cut feed pellets from falling into the gap between them.

[0040] The gear drive mechanism includes a ring gear 131 coaxially fixed to the bottom surface of the rotating ring plate 13, a drive gear meshing with the outer side of the ring gear 131, a bevel gear assembly connected to the drive gear, and a drive motor 7 connected to the bevel gear assembly.

[0041] More preferably, the inner side of the ring gear 131 is provided with an opening groove, which is movably connected to the outer side of the embedded ring plate. The embedded ring plate can be coaxially positioned and connected to the outer side of the support ring.

[0042] The upper end face of the rotating ring plate 13 is flush with the upper end face of the support ring 1, and the contact position of the two is closed, but not completely in contact, with a small gap, to avoid excessive friction between the two when the rotating ring plate 13 is working.

[0043] The bevel gear assembly includes a main bevel gear and a secondary bevel gear, a main shaft and a secondary shaft, which mesh with each other. The main shaft and the secondary shaft pass through the main bevel gear and the secondary bevel gear, respectively. The drive motor 7 drives the main shaft to rotate. Through the meshing of the main and secondary bevel gears, the secondary shaft is driven to rotate. The secondary shaft is connected to the drive gear, which drives the ring gear 131 to rotate, ultimately driving the rotation of the rotating ring plate 13. The bevel gear assembly is prior art and is not shown in detail in the accompanying drawings.

[0044] The material cover structure includes a closed ring plate 5 disposed on the outside of the rotating ring plate 13, a discharge cylinder 8 connected and fixed on the outside of the closed ring plate 5, a guide plate disposed near the inlet of the discharge cylinder 8, a top cover coaxially disposed above the closed ring plate 5, and a feed cylinder 6 connected to the top cover.

[0045] The material hood structure is a conventional structure and will not be described in detail here. After the particles are formed, they enter the closed ring plate 5, and after reaching the guide plate, they enter the discharge cylinder 8, where the particle material is discharged.

[0046] An annular seat 31 is provided on the outer side of the lower end of the pressure roller seat. An accommodating space is provided on the outer side of the pressure roller seat and the inner side of the annular seat 31. The accommodating space is connected to the vacuum suction assembly.

[0047] Among them, the second support ring 14 is set on the annular seat 31.

[0048] The vacuum suction assembly includes a suction cylinder 32 communicating with the containment space and a suction pump connected to the suction cylinder 32, used to extract dust from inside the device and purify the air; for the sake of simplifying the design, it will not be described in detail here, and the suction pump will not be separately labeled.

[0049] It should be noted that components not described in this solution can serve as supports and limiters during operation, such as the ring gear 131. They can be adapted for installation during actual operation and will not be described in detail here.

[0050] The specific working process of this utility model is as follows:

[0051] When the main shaft rotates, it drives the pressure roller seat and pressure roller 11 to rotate simultaneously. The material is extruded and formed by the pressure roller 11 to form the ring die 9. Since the permanent magnet directly drives the pressure roller seat, the original reduction mechanism is eliminated. The drive motor 7 drives the drive gear to move through the bevel gear assembly. The drive gear drives the ring gear 131 to rotate. The ring gear 131 drives the rotating ring plate 13 to rotate. The rotating ring plate 13 drives the material cutter 12 to make a ring motion on the outside of the ring die 9, so as to scrape off the material on the outside of the ring die 9.

[0052] The combined action of the bearing housing and the ring die 9 ensures smooth operation of the main shaft of the permanent magnet motor. Since the ring die 9 not only serves to discharge granules but also indirectly limits the pressure roller 11, there is a gap between the pressure roller 11 and the ring die 9 containing material. This allows the ring die 9 to buffer the force on the pressure roller 11, improving stability and avoiding the technical problem of large rotational fluctuations of the pressure roller 11.

[0053] The power components in this solution can be connected to a PLC controller, and the overall operation of the system can be achieved under the overall coordinated control of the PLC.

[0054] For other components on the pellet mill not described above, such as lubrication components, bearing components (connected to the main shaft), material conveying structures, sealing components, and overload protection systems, existing technologies are assumed to be used, and installation is carried out according to the actual application scenario. This is hereby stated.

[0055] The technical features of this utility model not described can be implemented by or by using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this utility model, and this utility model is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should also be within the protection scope of this utility model.

Claims

1. A compact permanent magnet direct-drive pellet mill, characterized in that, It includes a permanent magnet motor, a pressure roller seat, multiple pressure roller structures rotatably connected to the pressure roller seat, a ring mold (9) sleeved on the outside of the pressure roller seat, a scraper assembly disposed on the outside of the ring mold (9), a material cover structure disposed above the scraper assembly, and a gear drive mechanism connected to the scraper assembly; The permanent magnet motor includes a stator, a rotor and a main shaft (15). The main shaft (15) is coaxially connected to a bearing, the bearing is fixed on a bearing seat, and the top end of the main shaft (15) is coaxially fixedly connected to the pressure roller seat. The ring mold (9) is horizontally positioned on the first support ring, the first support ring is fixed on the second support ring (14), and the scraper assembly is movably connected to the outside of the second support ring (14).

2. The compact permanent magnet direct-drive pellet mill according to claim 1, characterized in that, The pressure roller structure includes two pressure rollers (11) rotatably disposed on both sides of the pressure roller seat, a wheel axle (111) coaxially passing through the pressure roller (11), and an upper eccentric shaft (113) and a lower eccentric shaft (112) eccentrically connected to the upper and lower ends of the wheel axle (111), respectively. The lower eccentric shaft (112) is fixedly connected to the pressure roller seat, and the upper eccentric shaft (113) is fixedly connected to the pressure roller top plate (10).

3. A compact permanent magnet direct-drive pellet mill according to claim 2, characterized in that, A gap is provided between the outer side of the pressure roller (11) and the inner side of the ring mold (9).

4. A compact permanent magnet direct-drive pellet mill according to claim 1, characterized in that, The scraper assembly includes a rotating ring plate (13), with positioning plates fixed in a ring array on the inner side of the rotating ring plate (13). The positioning plates are fixedly connected to the cutting blade (12), which is located close to the outer side of the ring mold (9). The bottom end of the rotating ring plate (13) is connected to a gear drive mechanism.

5. A compact permanent magnet direct-drive pellet mill according to claim 4, characterized in that, The gear drive mechanism includes a ring gear (131) coaxially fixed to the bottom surface of the rotating ring plate (13), a drive gear meshing with the outer side of the ring gear (131), a bevel gear assembly connected to the drive gear, and a drive motor (7) connected to the bevel gear assembly.

6. A compact permanent magnet direct-drive pellet mill according to claim 4, characterized in that, The upper end face of the rotating ring plate (13) is flush with the upper end face of the support ring, and the contact position of the two is perfectly sealed.

7. A compact permanent magnet direct-drive pellet mill according to claim 4, characterized in that, The material cover structure includes a closed ring plate (5) disposed outside the rotating ring plate (13), a discharge cylinder (8) connected and fixed outside the closed ring plate (5), a guide plate disposed near the inlet of the discharge cylinder (8), a top cover coaxially disposed above the closed ring plate (5), and a feed cylinder (6) connected to the top cover.

8. A compact permanent magnet direct-drive pellet mill according to claim 1, characterized in that, An annular seat (31) is provided on the outer side of the lower end of the pressure roller seat. An accommodating space is provided on the outer side of the pressure roller seat and the inner side of the annular seat (31). The accommodating space is connected to the vacuum suction assembly.

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