A direct-drive hammer cyclone mill

Abstract

This application relates to a direct-drive hammer cyclone mill, comprising: a housing; a grinding mechanism including a grinding shell fixedly connected to the housing and an end cap hinged to the end of the grinding shell, wherein a feeding pipe is connected to the center of the end cap and extends upwards from the end cap, and an output pipe for discharging material outwards is provided on the grinding shell; and a feeding mechanism including an air duct fixed to the housing, wherein a floating joint capable of elastically moving in the vertical direction is connected to the lower end of the air duct. This utility model achieves beltless transmission of the hammer cyclone mill by adopting a direct-drive method in which the motor directly drives the hammer head. The motor output end is directly connected to the hammer head, which can reduce energy loss during power transmission, reduce working noise, and avoid the installation and maintenance problems of transmission components such as pulleys and belts, making the overall structure more compact, the transmission efficiency higher, and the equipment manufacturing and maintenance costs effectively reduced.

Description

Technical Field

[0001] This application relates to the field of cyclone mill technology, and in particular to a direct-drive hammer cyclone mill. Background Technology

[0002] Hammer mills are commonly used for grinding grains, feed, and other solid granular materials. They are laboratory or industrial grinding devices. These devices typically use high-speed rotating hammers to impact and shear the material entering the grinding chamber, thereby crushing the material into uniform fine powder. The crushed fine powder is then conveyed by airflow into a cyclone separator for separation and collection. Hammer mills have advantages such as high grinding efficiency, controllable particle size, and strong adaptability. They are especially suitable for the pre-grinding process of grain, medicinal materials, and feed samples before sample separation and testing.

[0003] However, existing hammer cyclone mills still have some shortcomings in terms of structure and ease of use. First, the hammers in traditional mill housings are mostly driven by belt drives. Belt drives not only suffer from high noise and low energy transfer efficiency, but also lack compactness in structural layout, limiting the miniaturization and modular design of the equipment. Furthermore, they require pulleys, drive belts, and other components, increasing manufacturing and maintenance costs. Second, material is typically fed into the mill chamber via a feed pipe located in the center of the mill housing end cover. Opening or closing this end cover requires removing the clamps connecting to the upper pipe, increasing operational complexity and maintenance time. Third, the material ground by the cyclone mill needs to enter a cyclone separator through an output pipe for separation. However, in existing equipment, the cyclone separator is often fixed to the mill housing by bolts or rigid pipe connections. Since the cyclone separator requires regular cleaning, disassembly requires loosening each connection piece individually, resulting in cumbersome and inefficient operation. Finally, during the grinding process, a lot of heat is generated inside the grinding chamber and the drive motor. Most traditional equipment uses natural heat dissipation or simple air cooling, which has low heat dissipation efficiency and can easily lead to overheating of the equipment, affecting grinding performance and equipment life. Utility Model Content

[0004] To address the problems mentioned in the background art, such as high noise, low energy efficiency, and complex structure of belt drives, inconvenient disassembly and assembly of cyclone separators, cumbersome connection operation of end cap feed pipes, and poor heat dissipation of the grinding shell and motor, this application provides a direct-drive hammer cyclone mill.

[0005] The direct-drive hammer cyclone mill provided in this application adopts the following technical solution: A direct-drive hammer cyclone mill, comprising: chassis; A grinding mechanism includes a grinding shell fixedly connected to a housing and an end cap hinged to the end of the grinding shell. A feed pipe is connected to the center of the end cap and extends upward toward the end cap. The grinding shell is provided with an output pipe for discharging material outward. The feeding mechanism includes an air duct fixed to the machine housing. The lower end of the air duct is connected to a floating joint that can move elastically in the vertical direction. After the end cover is closed on the grinding housing, the upper end of the feeding pipe abuts against the floating joint, thereby allowing the material to enter the grinding housing. The cyclone separator is detachably connected to the output pipe of the grinding shell.

[0006] By adopting the above technical solution, firstly, a flexible floating joint is installed at the lower end of the air duct of the feeding mechanism. After the end cover is closed, the floating joint can abut against the upper end of the feeding pipe under the action of elastic force, which replaces the traditional method of using clamps for docking and quickly achieves the docking effect of the pipeline. Secondly, the cyclone separator is installed on the output pipe of the grinding shell in a detachable connection manner, which can facilitate the quick disassembly of the cyclone separator during maintenance or cleaning, simplify the operation steps of the staff, and help improve production efficiency.

[0007] Optionally, the grinding mechanism further includes a hammer head disposed inside the grinding housing, and a motor is fixed on the housing, the output end of the motor extending into the grinding housing and connected to the hammer head.

[0008] By adopting the above technical solution to replace the traditional method of power transmission using belts, the motor is directly connected to the hammer head to drive the hammer head. This not only reduces the noise generated during operation but also improves the efficiency of power transmission. In addition, it has the characteristics of compact structure and low cost.

[0009] Optionally, a screen is installed inside the grinding shell, and the mesh of the screen connects the inner cavity of the grinding shell with the inner cavity of the output pipe. A fixing plate is installed inside the grinding shell and in contact with the inner wall of the grinding shell.

[0010] By adopting the above technical solution, the ground material can pass through the screen into the output pipe and then be discharged outward.

[0011] Optionally, the output pipe is fixed with a connecting pipe at its end. The end of the connecting pipe away from the output pipe has a slot. The slot extends along the axis of the connecting pipe to the root position and then continues to extend along the circumference of the connecting pipe. The cyclone separator includes an input pipe. The outer wall of the input pipe has a locking block that protrudes radially outward. The locking block can be inserted into the slot, and the locking block and the slot can be engaged by rotating the input pipe, thereby realizing a quick locking connection between the input pipe and the connecting pipe.

[0012] By adopting the above technical solution, the assembly and disassembly of the cyclone separator can be quickly realized. In specific operation, the input end of the cyclone separator is inserted into the connecting pipe, and the locking block is inserted into the slot along the axis. Then, the cyclone separator is rotated so that the locking block moves to the root position of the slot, realizing the rapid assembly of the cyclone separator. When disassembling, it is only necessary to rotate the cyclone separator in the opposite direction and move the cyclone separator outward along the axis of the input pipe to quickly disassemble the cyclone separator, thereby improving the assembly and disassembly speed of the cyclone separator.

[0013] Optionally, the feeding mechanism further includes a hopper and a feeding mechanism connected below the hopper. The hopper and the feeding mechanism are internally interconnected, and the air duct is located below the feeding mechanism and is connected to the inner cavity of the feeding mechanism.

[0014] By adopting the above technical solution, the material collection, storage and conveying effects can be achieved. The material falls into the hopper and enters the feeding mechanism under the action of gravity. When the feeding mechanism is working, it can guide the material into the grinding chamber below at a specified speed, which is conducive to achieving the effect of automated feeding.

[0015] Optionally, the duct has a first channel extending vertically through it and a second channel connected to the first channel, the end of the second channel being open and communicating with the outside air.

[0016] By adopting the above technical solution, air can also enter the grinding shell during the process of material being transported into the grinding shell, generating a high-speed airflow inside the grinding shell, which causes the ground material to be discharged outward under the action of the high-speed airflow.

[0017] Optionally, the duct includes a vertically downward extending extension tube, the floating joint is sleeved on the lower end of the extension tube, and the inner cavity of the floating joint is connected to the inner cavity of the duct, so that the material falling from the feeding mechanism can fall into the floating joint. A locking ring is fixed on the lower outer wall of the extension tube, and the inner wall of the floating joint has an inwardly extending protruding ring. The inner diameter of the protruding ring is smaller than the outer diameter of the locking ring, and it is configured to limit the axial movement of the floating joint by using the contact between the protruding ring and the locking ring.

[0018] By adopting the above technical solution, the air duct serves as both a connector between the feed pipe and the feeding mechanism and a vent pipe for air to enter the mill casing. Furthermore, since the air duct is connected to the casing, maintenance of the hopper and feeding mechanism will not interfere with the location of the air duct and the floating joint. The floating joint can move downwards under gravity, thereby docking with the feed pipe that has moved below it, thus connecting the inner cavity of the feed pipe with the air duct, the feeding mechanism, and the hopper, facilitating the introduction of materials into the middle of the mill casing.

[0019] Optionally, a spring is installed between the floating joint and the duct, the spring being configured to apply a downward elastic force to the floating joint, and a first sealing ring is installed at the lower end of the floating joint.

[0020] By adopting the above technical solution, the spring can provide a downward elastic force to the floating structure, so that the floating joint abuts against the upper end of the feed pipe on the end cover. With the first sealing ring, the sealing effect of the contact area between the two can be achieved, preventing the material from spreading outward when falling.

[0021] Optionally, the lower outer wall of the floating joint is provided with a guide portion, and the edge of the feed tube on the end cap is provided with a guide slope.

[0022] By adopting the above technical solution, the setting of the guide section and the guide slope can facilitate the smooth entry of the feed pipe into the position below the floating joint, thus playing a guiding role.

[0023] Optionally, a cooling system may also be included, which is configured to cool the motor and / or the grinding housing.

[0024] By adopting the above technical solution, the heat generated by the motor and / or grinding shell during operation can be dissipated, thereby preventing damage to the motor or grinding shell caused by high temperature.

[0025] In summary, this application includes at least one of the following beneficial technical effects: This invention achieves beltless transmission for hammer cyclone mills by using a direct drive method where the motor directly drives the hammer head. The motor output is directly connected to the hammer head, which reduces energy loss during power transmission, lowers operating noise, and avoids the installation and maintenance problems of transmission components such as pulleys and belts. This makes the overall structure more compact, the transmission efficiency higher, and the manufacturing and maintenance costs of the equipment effectively reduced.

[0026] This utility model features a quick-connect locking structure between the cyclone separator and the grinding shell. By engaging the locking block and the slot, the installation or disassembly of the cyclone separator can be completed simply by inserting and slightly rotating it. This connection method eliminates the need for bolts or clamps, enabling rapid separation and assembly of the cyclone separator. It facilitates quick operation during cleaning or maintenance, significantly improving ease of use and production efficiency.

[0027] This invention incorporates a flexible floating joint in the feeding mechanism. Under the action of a spring, the floating joint automatically abuts against the upper end of the feeding pipe, achieving a reliable seal. After the end cover is closed, there is no need for manual alignment or disassembly of clamps, ensuring a continuous and smooth material feeding process. This reduces the number of operation steps and improves the working efficiency and sealing reliability of the end cover under frequent opening and closing conditions.

[0028] This invention features a cooling coil on the outer wall of the grinding shell, allowing the cooling medium to flow sequentially through the grinding shell and the motor, thus achieving synchronous cooling of the grinding chamber and the drive motor. After being cooled by the radiator and fan, the cooling medium re-enters the circulation loop, thereby effectively controlling the operating temperature of the equipment, improving heat dissipation performance, preventing performance degradation caused by overheating, and ensuring long-term stable operation of the equipment. Attached Figure Description

[0029] Figure 1 This is a perspective view of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is an exploded view of the cyclone separator of this utility model connected to the output pipe; Figure 4 This is a cross-sectional view of the cyclone separator of this utility model connected to the output pipe; Figure 5 This utility model is a three-dimensional butt joint pipe. Figure 1 ; Figure 6 This utility model is a three-dimensional butt joint pipe. Figure 2 ; Figure 7 This is a cross-sectional view of the connection between the air duct, floating joint and discharge pipe of this utility model; Figure 8 This is a partial perspective view of the present invention; Figure 9 This is a cross-sectional view of the internal structure of the casing of this utility model; Figure 10 This is a structural diagram of the connection between the grinding shell and the cooling coil of this utility model; Figure 11 This is a perspective view of the grinding shell of this utility model.

[0030] Explanation of reference numerals in the attached figures: 1. Casing; 2. Hopper; 3. Feeding mechanism; 4. Air duct; 401. Extension pipe; 402. First channel; 403. Second channel; 5. Floating joint; 501. Convex ring; 502. Guide part; 6. Motor; 7. Grinding shell; 701. Output pipe; 702. Screen; 703. Fixing plate; 8. Hammer; 9. End cover; 901. Feed pipe; 10. Pipe; 11. Pump body; 12. Radiator; 13. Cooling fan; 14. Cyclone separator; 1401. Input pipe; 1402. Locking block; 15. Connecting pipe; 1501. Slot; 1502. First inclined guide surface; 1503. Threaded hole; 16. Sealing gasket; 17. Spring; 18. Locking ring; 19. First sealing ring; 20. Second sealing ring; 21. Cooling coil; 22. Third sealing ring. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] This application discloses a direct-drive hammer cyclone mill, including a housing 1. The housing 1 has a rectangular structure and a grinding mechanism is installed inside it. A feeding mechanism is provided above it. After the grinding mechanism grinds the material, it is discharged to the external cyclone separator 14 through the pipe 10.

[0033] The grinding mechanism includes a grinding shell 7 fixedly connected to the housing 1 and an end cover 9 hinged to the end of the grinding shell 7. The end cover 9 is rotatably mounted on one side of the end of the grinding shell 7 using a pin. After the end cover 9 is closed, a locking handle is provided on the end of the grinding shell 7 away from its hinge, which is used to lock and fix the end cover 9 to the end of the grinding shell 7 to achieve a tight fit. A feed pipe 901 is connected to the center of the end cover 9. The feed pipe 901 extends upwards from the end cover 9. The feed pipe 901 is mainly used to collect the material conveyed by the upper feeding mechanism and guide the material into the grinding shell 7. The grinding shell 7 is provided with an output pipe 701 for discharging the material outwards. The output pipe 701 is used to discharge the material outwards into the cyclone separator 14.

[0034] The grinding mechanism also includes a hammer head 8 set inside the grinding shell 7. The hammer head 8 has a three-pronged structure. A motor 6 is fixed on the housing 1. The output end of the motor 6 extends into the grinding shell 7 and is connected to the hammer head 8. The motor 6 directly drives the hammer head 8 to rotate, thereby shearing and grinding the material entering the grinding shell 7. This direct drive method replaces the traditional belt drive method and has the characteristics of low noise, high power transmission efficiency, low cost and compact structure.

[0035] A screen 702 is installed inside the grinding shell 7. The mesh of the screen 702 connects the inner cavity of the grinding shell 7 to the inner cavity of the output pipe 701. The screen 702 is specifically located on the upper part of the inner wall of the grinding shell 7. The output pipe 701 is also connected to the upper part of the grinding shell 7. After the material is ground, it passes through the mesh of the screen 702 and is discharged outward along the output pipe 701. In this example, the screen 702 has an arc-shaped structure. In order to fix the screen 702 and protect the inner wall of the grinding shell 7, a fixing plate 703 is installed inside the grinding shell 7 and in contact with the inner wall of the grinding shell 7. After the fixing plate 703 is fixed inside the grinding shell 7, it can simultaneously fix the screen 702. In addition, due to the setting of the fixing plate 703, it can act as an isolation component to prevent damage to the inner wall of the grinding shell 7. During maintenance, only the fixing plate 703 needs to be replaced, thus playing a protective role.

[0036] The feeding mechanism includes a hopper 2, a feeding mechanism 3 connected below the hopper 2, and an air duct 4 fixed to the housing 1. In this example, the feeding mechanism 3 is a dial feeder, which uses a motor to drive the dial to feed the material. It is understood that in other embodiments, this feeding mechanism 3 can also be implemented by a screw conveyor or other conveying structures, mainly to make the material conveyed downward at a specified speed. The hopper 2 and the feeding mechanism 3 are internally interconnected. The feeding mechanism 3 uses a spiral blade conveying method to transport materials. Its structure and principle are conventional settings in the existing technology and will not be described in detail here. The air duct 4 is located below the feeding mechanism 3 and is connected to the inner cavity of the feeding mechanism 3. Specifically, in this example, the lower end of the hopper 2 is directly connected to the feeding mechanism 3. The lower end of the feeding mechanism 3 is fixed above the housing 1. A through hole is opened on the upper part of the housing 1 for material discharge. The air duct 4 is located inside the housing 1. Its upper end is fixed to the top wall of the housing 1 by a flange connection, and its vertical inner cavity is connected to the inner cavity of the feeding mechanism 3. The lower end of the air duct 4 is connected to a floating joint 5 that can move elastically in the vertical direction. After the end cover 9 is closed on the grinding shell 7, the upper end of the discharge pipe 901 abuts against the floating joint 5, thereby allowing the material to enter the grinding shell 7.

[0037] Among them, the air duct 4 has a first channel 402 that runs vertically through it (e.g. Figure 7 The vertical downward arrow indicates the channel 402 (as shown) and the second channel 403 connected to the first channel 402 (as shown). Figure 7 The second channel 403, which is located at the end of the horizontal left arrow shown, is open and connected to the outside air. In this example, the air duct 4 is a shell-like structure. One end of its inner cavity (i.e., the first channel 402) is used to connect the inner cavity of the feeding mechanism 3 with the inner cavity of the discharge pipe 901. The overall inner cavity of the shell-like structure is the second channel 403, which is used to introduce outside air into the inner cavity of the grinding shell 7 when the hammer 8 is rotating.

[0038] The air duct 4 includes a vertically downward extending extension pipe 401. The floating joint 5 is sleeved on the lower end of the extension pipe 401, and the inner cavity of the floating joint 5 is connected to the inner cavity of the air duct 4. The material falling from the feeding mechanism 3 can fall into the floating joint 5. A locking ring 18 is fixed on the lower outer wall of the extension pipe 401. The inner wall of the floating joint 5 has an inwardly extending protruding ring 501. The inner diameter of the protruding ring 501 is smaller than the outer diameter of the locking ring 18. It is configured to limit the axial movement of the floating joint 5 by contact between the protruding ring 501 and the locking ring 18.

[0039] A spring 17 is installed between the floating joint 5 and the air duct 4. The spring 17 is configured to apply a downward elastic force to the floating joint 5. A first sealing ring 19 is installed at the lower end of the floating joint 5. After the feed pipe 901 moves to the position below the floating structure, the floating joint 5, under the elastic force of the spring 17, will have its end tightly pressed against the end of the feed pipe 901, and the first sealing ring 19 will cooperate to achieve a sealing effect at the contact point between the two. In this example, a second sealing ring 20 is installed between the floating joint 5 and the extension pipe 401. The second sealing ring 20 is used to seal the connection between the floating joint 5 and the extension pipe 401.

[0040] The lower outer wall of the floating joint 5 is provided with a guide portion 502, which is a chamfered or rounded structure at the lower end of the floating joint 5. The edge of the feed tube 901 on the end cover 9 is provided with a guide slope. During the movement of the end cover 9 (e.g. Figure 7 As shown, the feed tube 901 is closed in the direction indicated by the right arrow (the direction of the end cap 9 is the closing direction). The guide slope will contact the guide part 502 first. The inclined surface can apply an upward force to the floating joint 5, so that the floating joint 5 moves upward, thereby facilitating the feed tube 901 to move to the position below the floating joint 5. In this example, when the end cap 9 is closed, the feed tube 901 is exactly at the lower end of the floating structure, and the first sealing ring 19 just abuts against the upper end face of the feed tube 901.

[0041] Cyclone separator 14 is detachably connected to the output pipe 701 of the grinding shell 7. The structure and principle of cyclone separator 14 are conventional settings in the prior art and will not be described in detail here. Specifically, a connecting pipe 15 is fixed to the end of the output pipe 701. A slot 1501 is opened at the end of the connecting pipe 15 away from the output pipe 701. The slot 1501 extends along the axial direction of the connecting pipe 15 to the root position and then continues to extend along the circumference of the connecting pipe 15. The cyclone separator 14 includes an input pipe 1401. The outer wall of the input pipe 1401 has a locking block 1402 that protrudes radially outward. The locking block 1402 can be inserted into the slot 1501. By rotating the input pipe 1401, the locking block 1402 and the slot 1501 are engaged with each other, thereby realizing a quick locking connection between the input pipe 1401 and the connecting pipe 15. In addition, after the input pipe 1401 is inserted into the connecting pipe 15, a third sealing ring 22 is provided between the input pipe 1401 and the connecting pipe 15. In order to further improve the detachability of the cyclone separator 14, one side of the slot 1501 of the connecting pipe 15 is designed as an inclined structure to form a first inclined guide surface 1502. In this way, during the disassembly process, the locking block 1402 can contact the first inclined guide surface 1502 after being rotated to the limit position, so as to quickly detach from the slot 1501.

[0042] In this example, a threaded hole 1503 is provided on the outer wall of the end of the connecting pipe 15 near the output pipe 701. A screw is installed at the threaded hole 1503 to fix the connecting pipe 15 to the output pipe 701. One end of the connecting pipe 15 is located inside the housing 1, and the other end extends to the outside of the housing 1. Therefore, in this example, a sealing gasket 16 is fitted over the outside of the connecting pipe 15. Placing the sealing gasket 16 between the connecting pipe 15 and the housing 1 can both provide a seal and prevent the connecting pipe 15 from directly contacting the housing 1 and causing wear.

[0043] It also includes a cooling system configured to cool the motor 6 and / or the grinding housing 7.

[0044] In this embodiment, the cooling system includes a cooling coil 21 coiled around the outer wall of the grinding shell 7. The cooling coil 21 has a spiral structure on the outer wall of the grinding shell 7 and contains a refrigerant. During operation, it exchanges heat with the heat inside the grinding shell 7. The output end of the cooling coil 21 is connected to a motor 6. The motor 6 has a built-in cooling channel, the specific structure of which is a conventional setting in the prior art and will not be described in detail here. It is configured to continue cooling the motor 6 after cooling the grinding shell 7. The motor 6 is connected to a radiator 12 through a pipe 10. A cooling fan 13 is installed on the outside of the radiator 12. The output end of the radiator 12 is connected to a pump body 11 through a pipe 10. The output end of the pump body 11 is connected to the input end of the cooling coil 21 through a pipe 10. In this example, the radiator 12 can adopt a finned heat dissipation structure, a corrugated heat dissipation structure, etc. The cooling medium can enter the heat dissipation pipe 10 inside the radiator 12, and the cooling fan blows towards the radiator 12, thereby cooling the refrigerant.

[0045] In this embodiment, the cooling method described above involves connecting the grinding shell 7 and the motor 6 in series to achieve water cooling. It is understood that in other embodiments, the cooling methods for the grinding shell 7 and the motor 6 can also be as follows: 1. Cooling the motor 6 using only water cooling or air cooling; 2. Cooling the grinding shell 7 using only water cooling or air cooling; 3. Cooling the grinding shell 7 and the motor 6 independently using water cooling or air cooling respectively.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A direct drive hammer mill cyclone characterized in that, include: Casing (1); The grinding mechanism includes a grinding shell (7) fixedly connected to a housing (1) and an end cap (9) hinged to the end of the grinding shell (7). A hammer (8) is provided inside the grinding shell (7). A motor (6) is fixed on the housing (1). The output end of the motor (6) extends into the grinding shell (7) and is connected to the hammer (8).

2. A direct drive hammer mill according to claim 1, wherein, The end cap (9) is connected to a feed pipe (901) at its center, and the feed pipe (901) extends upwards from the end cap (9). The grinding shell (7) is provided with an output pipe (701) for discharging material outwards; it also includes The feeding mechanism includes an air duct (4) fixed on the housing (1), the lower end of the air duct (4) is connected to a floating joint (5) that can move elastically in the vertical direction, and after the end cover (9) is closed on the grinding shell (7), the upper end of the feeding pipe (901) abuts against the floating joint (5), thereby allowing the material to enter the grinding shell (7). Cyclone separator (14) is detachably connected to the output pipe (701) of the grinding shell (7).

3. A direct drive hammer mill according to claim 2, wherein, A screen (702) is installed inside the grinding shell (7). The mesh of the screen (702) connects the inner cavity of the grinding shell (7) with the inner cavity of the output pipe (701). A fixing plate (703) is installed inside the grinding shell (7) and in contact with the inner wall of the grinding shell (7).

4. A direct drive hammer mill according to claim 2, wherein, The output pipe (701) is fixed with a connecting pipe (15) at its end. A slot (1501) is provided at the end of the connecting pipe (15) away from the output pipe (701). The slot (1501) extends along the axis of the connecting pipe (15) to the root position and then continues to extend along the circumference of the connecting pipe (15). The cyclone separator (14) includes an input pipe (1401). The outer wall of the input pipe (1401) has a locking block (1402) that protrudes radially outward. The locking block (1402) can be inserted into the slot (1501). By rotating the input pipe (1401), the locking block (1402) and the slot (1501) are engaged with each other, thereby realizing a quick locking connection between the input pipe (1401) and the connecting pipe (15).

5. A direct drive hammer mill according to claim 2, wherein, The feeding mechanism also includes a hopper (2) and a feeding mechanism (3) connected below the hopper (2). The hopper (2) and the feeding mechanism (3) are internally connected to each other. The air duct (4) is located below the feeding mechanism (3) and is connected to the inner cavity of the feeding mechanism (3).

6. A direct drive hammer mill according to claim 2, wherein, The air duct (4) has a first channel that runs vertically through it and a second channel that is connected to the first channel. The end of the second channel is open and connected to the outside air.

7. A direct drive hammer mill according to claim 5, wherein, The air duct (4) includes a vertically downward extending extension tube. The floating joint (5) is sleeved on the lower end of the extension tube, and the inner cavity of the floating joint (5) is connected to the inner cavity of the air duct (4). The material falling from the feeding mechanism (3) can fall into the floating joint (5). A locking ring (18) is fixed on the lower outer wall of the extension tube. The inner wall of the floating joint (5) has an inwardly extending protruding ring (501). The inner diameter of the protruding ring (501) is smaller than the outer diameter of the locking ring (18). It is configured to limit the axial movement of the floating joint (5) by contacting the protruding ring (501) and the locking ring (18).

8. A direct drive hammer mill according to claim 7, wherein, A spring (17) is installed between the floating joint (5) and the air duct (4). The spring (17) is configured to apply a downward elastic force to the floating joint (5). A first sealing ring (19) is installed at the lower end of the floating joint (5).

9. A direct drive hammer mill according to claim 2, wherein, The lower outer wall of the floating joint (5) is provided with a guide part (502), and the edge of the feed tube (901) on the end cap (9) is provided with a guide slope.

10. A direct drive hammer mill according to claim 2, wherein, It also includes a cooling system configured to cool the motor (6) and / or the grinding housing (7).

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