Hammer mill with annular pulverizing chamber structure

Abstract

The application belongs to the technical field of hammer crushing equipment, and particularly relates to a hammer crusher with an annular crushing chamber structure, which comprises a crushing chamber main body, a screen assembly and a rotor assembly. An annular crushing chamber is formed in the crushing chamber main body, and the axis of the annular crushing chamber is horizontally arranged. A feeding port, which is in communication with the annular crushing chamber, is arranged on the side surface of the crushing chamber main body and is opposite to the axis of the annular crushing chamber. A discharging port, which is in communication with the annular crushing chamber, is arranged at the bottom of the crushing chamber main body. A plurality of re-crushing chambers are sequentially arranged around the circumference of the annular crushing chamber. The screen assembly comprises a plurality of screens, which are sequentially arranged around the circumference of the annular crushing chamber and form a circular ring. Each re-crushing chamber is located between adjacent screens. The rotor assembly is arranged in the annular crushing chamber, and the axis of the rotor assembly is arranged in coincidence with the axis of the annular crushing chamber. The air supplement mechanism of the rotor assembly is arranged close to the feeding port, and the air supplement mechanism provides a certain positive pressure for the annular crushing chamber.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hammer mill, and particularly relates to a hammer mill with an annular pulverizing chamber structure. BACKGROUND

[0002] At present, the hammer mill mainly used in the domestic feed industry is mainly a water-drop type hammer mill, which has the following main features: the pulverizing chamber structure is water-drop type, the hammer mill comprises a hammer mill body, a hammer mill base, a rotor assembly, a press screen mechanism and an operating door, the top of the hammer mill body is provided with a feeding port, the material to be pulverized is uniformly fed into the water-drop type pulverizing chamber through a feeder for pulverization, the material is impacted, sheared and ground under the impact of the high-speed rotating hammer, the material particles are broken to form small particles in the process, and when the material is repeatedly pulverized to a certain fineness, i.e., the particle diameter is smaller than the screen aperture, the material is discharged from the hammer mill under the action of the centrifugal force of the material itself and the pressure difference of the airflow inside and outside the screen. The structure of the water-drop type hammer mill is relatively fixed, and the screen is distributed only on the two sides of the pulverizing chamber. Since the material is fed from the top of the hammer mill, the screen cannot cover the entire circular space of the pulverizing chamber, and the existing water-drop type hammer mill has the pulverizing chamber distributed only at the bottom of the hammer mill. Under the existing structure, it is difficult to have a greater breakthrough in the pulverizing efficiency. For example, a new type of hammer mill is disclosed in the existing patent application CN201220579586.8.

[0003] Meanwhile, the rotor assembly of the existing water-drop type hammer mill is usually composed of a main shaft, a hammer holder plate, a hammer pin shaft, a hammer and a spacer sleeve. The structure of the overall rotor assembly is relatively fixed. The hammer holder plate is installed on the main shaft through a large spacer sleeve, and the hammer is installed on the hammer pin shaft through the spacer sleeve according to the arrangement. The structure of the overall rotor assembly is relatively complex, and there are many parts. The installation mode of the hammer is also relatively traditional, i.e., the hammer pin shaft is fixed on the hammer holder plate through the pin shaft hole on the hammer holder plate, and then the hammer is arranged on the hammer pin shaft according to the designed hammer arrangement. The hammer and the hammer holder plate are limited by the small spacer sleeve. When the hammer is replaced or the gap between the hammer and the screen is adjusted, the hammer and the small spacer sleeve need to be taken down and installed one by one. At the same time, attention needs to be paid to the length of the hammer spacer sleeve. This work is tedious and time-consuming. SUMMARY

[0004] To solve the problems of the fixed structure of the hammer mill and the difficulty in having a greater breakthrough in the pulverizing efficiency in the prior art, the present application provides a hammer mill with an annular pulverizing chamber structure.

[0005] To solve the above technical problems, the technical solution adopted by the present application is as follows: a hammer mill with an annular pulverizing chamber structure, comprising,

[0006] The pulverizing chamber body is internally formed with an annular pulverizing chamber, the axis of the annular pulverizing chamber is horizontally arranged, a feeding port is arranged on the side of the pulverizing chamber body and is in communication with the annular pulverizing chamber, the feeding port is arranged opposite to the axis of the annular pulverizing chamber, a discharging port is arranged at the bottom of the pulverizing chamber body and is in communication with the annular pulverizing chamber, and a plurality of re-pulverizing chambers are sequentially arranged around the circumference of the annular pulverizing chamber;

[0007] The screen assembly comprises a plurality of screens, the plurality of screens are sequentially arranged around the circumference of the annular pulverizing chamber and form a circular ring, and each of the re-pulverizing chambers is located between adjacent screens.

[0008] The rotor assembly is arranged in the annular pulverizing chamber, the axis of the rotor assembly is arranged coincident with the axis of the annular pulverizing chamber, the rotor assembly comprises a left hammer frame plate, a right hammer frame plate, a connecting shaft, a air supplementing mechanism and a plurality of groups of hammer piece mechanisms, the left hammer frame plate and the right hammer frame plate are respectively arranged on the two sides of the hammer piece mechanisms, the plurality of groups of hammer piece mechanisms are sequentially and spacedly arranged around the circumference of the connecting shaft, the air supplementing mechanism comprises a plurality of air supplementing blades, the plurality of air supplementing blades are sequentially and spacedly arranged at one end of the connecting shaft around the circumference of the connecting shaft, the air supplementing mechanism is arranged close to the feeding port, the air supplementing mechanism is used for providing a positive pressure for the annular pulverizing chamber, and the other end of the connecting shaft away from the air supplementing mechanism is provided with a driving mechanism, the driving mechanism is used for driving the rotor assembly to rotate.

[0009] As preferred, the air supplementing mechanism further comprises a first connecting plate and a second connecting plate, the first connecting plate is connected with the one end of the connecting shaft away from the driving mechanism, the second connecting plate is connected with the annular pulverizing chamber, and the two ends of the air supplementing blades are respectively connected with the first connecting plate and the second connecting plate. The structure of the air supplementing mechanism is simple and reliable, and is ingenious in design. The traditional hammer piece type pulverizer is broken in that the material is fed from the side feeding port of the pulverizer and is initially impacted and beaten by the air supplementing mechanism, and then is thrown to the periphery of the annular pulverizing chamber, so that the material moves at high speed in the annular pulverizing chamber more uniformly. The air supplementing mechanism can provide a positive pressure for the annular pulverizing chamber under negative pressure, effectively disturbs the circulating layer, greatly improves the pulverizing effect, and the plurality of screens form a 360-degree annular structure, breaking the bottleneck of the limited area of the screen caused by the original feeding port being arranged on the top. Therefore, the air supplementing mechanism and the screen assembly are matched, and the discharging efficiency and the pulverizing of the material are greatly improved.

[0010] As preferred, the driving mechanism comprises a base, a main shaft, a main shaft bearing seat and a main motor, the base is arranged on one side of the pulverizing chamber body, the main shaft bearing seat and the main motor are arranged on the base, one end of the main shaft is connected with the connecting shaft, and the other end of the main shaft passes through the main shaft bearing seat and is connected with the output end of the main motor through a shaft coupling. The structure of the driving mechanism is simple and reliable, the transmission is stable, the technology is mature, and the cost is low.

[0011] As preferred, the pulverizing chamber body is provided with control doors on both sides in the radial direction, which are opened to expose the annular pulverizing chamber. The control doors are convenient for opening to perform screen mounting and dismounting and other maintenance operations.

[0012] As preferred, the hammer mechanism comprises a hammer pin shaft, a limiting member and a plurality of hammers, the plurality of hammers are sequentially and spacedly arranged along the axial direction of the annular pulverizing chamber, the two ends of the hammer pin shaft are connected with the left hammer frame plate and the right hammer frame plate respectively, and the hammers are rotationally arranged on the hammer pin shaft; the limiting member comprises a limiting body and a plurality of limiting grooves, the limiting body comprises a first limiting plate, a first side plate and a second limiting plate which are sequentially connected, an avoiding through slot is formed between the first limiting plate, the first side plate and the second limiting plate, the hammer pin shaft is located in the avoiding through slot, the limiting grooves are formed through the first limiting plate and the second limiting plate, and a plurality of the limiting grooves are sequentially and spacedly arranged along the axial direction of the annular pulverizing chamber, one end of the hammer is located in the limiting groove. Compared with the conventional hammer mounting form, the hammer mechanism does not need to make a small spacer sleeve for limiting the hammers, when mounting the hammers, the hammers only need to be sequentially inserted into the limiting grooves in order, and then the hammer pin shaft is passed through the pin shaft hole of the hammer to be fixed, which greatly saves the time for replacing the hammers, improves the work efficiency and reduces the labor cost; meanwhile, the hammer mechanism has another feature that the hammers are in an unfolded state when the rotor assembly is in a static rotating state, which can greatly reduce the unbalance during starting and the starting current, and also protects the bearing and prolongs its service life.

[0013] Further, the second limiting plate is further connected with a second side plate, the second side plate is oppositely arranged with the first side plate, the first limiting plate, the first side plate, the second limiting plate and the second side plate are in an integrated structure, the cross section of the limiting body is in a G shape, and the two ends of the limiting body are connected with the left hammer frame plate and the right hammer frame plate through welding respectively. The structure strength and installation reliability of the limiting body are improved, and the structure of the limiting body is simple and convenient for processing and manufacturing.

[0014] Further, the first side plate and the second side plate are both penetrated with overflow holes, and the overflow holes on the first side plate and the second side plate are oppositely arranged. During rotation, the overflow holes can reduce the resistance and thus reduce the no-load current.

[0015] As preferred, the hammers of adjacent hammer mechanisms are alternately distributed along the axial direction of the annular pulverizing chamber. The pulverizing effect is ensured.

[0016] As preferred, the number of the screens is three, and the number of the re-pulverizing chambers is also three. The number of the screens and the re-pulverizing chambers is reasonable, which ensures the pulverizing effect and discharging efficiency, simplifies the structure, is convenient for mounting and dismounting, and has a low cost.

[0017] Further, the screen is arranged on the annular inner wall of the annular pulverizing chamber through a press screen frame. The existing press screen frame can be used, which is mature in technology and ensures convenient and reliable installation of the screen.

[0018] Beneficial effects:

[0019] 1. The hammer mill with the annular pulverizing chamber structure breaks the traditional hammer mill with the upper feeding and pulverizing, and the material enters from the side feeding port of the hammer mill, is initially impacted and beaten by the air supply mechanism, and is thrown to the periphery of the annular pulverizing chamber, so that the material moves at a high speed in the annular pulverizing chamber more uniformly, the air supply mechanism can provide a positive pressure for the annular pulverizing chamber under negative pressure, effectively disturbs the annular flow layer, greatly improves the pulverizing effect, and the multiple screens form a 360-degree annular structure, which breaks the bottleneck of the limited area of the screen due to the upper feeding port, so that the air supply mechanism and the screen assembly cooperate to greatly improve the discharging efficiency and pulverizing of the material.

[0020] 2. The hammer mill with the annular pulverizing chamber structure is provided with three re-pulverizing chambers in the circumferential direction of the annular pulverizing chamber, so that the annular pulverizing chamber is equally divided into three parts, the re-pulverizing chamber is the existing re-pulverizing chamber, the number of impacts of the material in the annular pulverizing chamber is increased, the pulverizing efficiency is greatly improved, and the energy consumption is reduced.

[0021] 3. Compared with the traditional hammer installation form, the hammer mechanism of the present application does not need to make a small spacer sleeve for limiting the hammer, when the hammer is installed, the hammer only needs to be sequentially inserted into the limiting groove, and then the hammer pin shaft is passed through the pin shaft hole of the hammer to be fixed, so that the time for replacing the hammer is greatly saved, the work efficiency is improved, and the labor cost is reduced. Meanwhile, the hammer mechanism has another feature that the hammer is in an unfolded rotating state under the static rotating state of the rotor assembly, when the driving mechanism is started, the unbalance during starting can be greatly reduced, the starting current is reduced, the bearing is well protected, and the service life is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of the hammer mill with the annular pulverizing chamber structure of the present application;

[0024] Figure 2 is Figure 1 a schematic diagram of the three-dimensional structure with a control door removed.

[0025] Figure 3 is the cross-sectional view of the hammer mill with the annular pulverizing chamber structure of the present application;

[0026] Figure 4 is the front view of the internal structure of the hammer mill with the annular pulverizing chamber structure of the present application;

[0027] Figure 5 is the perspective view of the rotor assembly of the hammer mill with the annular pulverizing chamber structure of the present application;

[0028] Figure 6 is the perspective view of the rotor assembly of the hammer mill with the annular pulverizing chamber structure of the present application; Figure 5 is the partial enlarged view of A in

[0029] Figure 7 is the cross-sectional view of the rotor assembly of the hammer mill with the annular pulverizing chamber structure of the present application;

[0030] Figure 8 is the perspective view of the limiting member of the hammer mill with the annular pulverizing chamber structure of the present application;

[0031] In the figure: 1, pulverizing chamber main body, 11, annular pulverizing chamber, 12, feed inlet, 13, discharge outlet, 14, re-pulverizing chamber, 15, control door, 2, screen assembly, 21, screen, 22, screen pressing frame, 3, rotor assembly, 31, left hammer frame plate, 32, right hammer frame plate, 33, coupling shaft, 34, air supplementing mechanism, 341, air supplementing blade, 342, first connecting plate, 343, second connecting plate, 35, hammer mechanism, 351, hammer pin shaft, 352, limiting member, 3521, first limiting plate, 3522, first side plate, 3523, second limiting plate, 3524, second side plate, 3525, avoiding through slot, 3526, limiting slot, 3527, flow passage, 353, hammer, 4, driving mechanism, 41, base, 42, main shaft, 43, main bearing seat, 44, main motor, 45, coupling. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0033] EMBODIMENT

[0034] As Figures 1-8As shown, a hammer mill with a ring-shaped crushing chamber structure includes a crushing chamber body 1, a screen assembly 2, and a rotor assembly 3. The inside of the crushing chamber body 1 forms a ring-shaped crushing chamber 11, the axis of the ring-shaped crushing chamber 11 is horizontally arranged, the side of the crushing chamber body 1 is provided with a feed inlet 12 which is in communication with the ring-shaped crushing chamber 11, the feed inlet 12 is arranged opposite to the axis of the ring-shaped crushing chamber 11, the bottom of the crushing chamber body 1 is provided with a discharge outlet 13 which is in communication with the ring-shaped crushing chamber 11, and a plurality of re-crushing chambers 14 are arranged around the circumference of the ring-shaped crushing chamber 11; the screen assembly 2 includes a plurality of screens 21, and the screens 21 are arranged around the circumference of the ring-shaped crushing chamber 11 and form a circular ring shape. In this embodiment, the screens 21 are arranged on the inner ring-shaped wall of the ring-shaped crushing chamber 11 by a screen pressing frame 22. Each re-crushing chamber 14 is located between adjacent screens 21. In this embodiment, the number of screens 21 is three, and the number of re-crushing chambers 14 is also three. The rotor assembly 3 is arranged in the ring-shaped crushing chamber 11, the axis of the rotor assembly 3 is arranged coincidentally with the axis of the ring-shaped crushing chamber 11, and the rotor assembly 3 includes a left hammer frame plate 31, a right hammer frame plate 32, a connecting shaft 33, a air supplement mechanism 34, and a plurality of hammer piece mechanisms 35. The left hammer frame plate 31 and the right hammer frame plate 32 are arranged on the two sides of the hammer piece mechanism 35, respectively. The plurality of hammer piece mechanisms 35 are arranged around the circumference of the connecting shaft 33 at intervals. The air supplement mechanism 34 includes a plurality of air supplement blades 341, and the air supplement blades 341 are arranged at one end of the connecting shaft 33 at intervals around the circumference of the connecting shaft 33. The air supplement mechanism 34 is arranged close to the feed inlet 12, and is used to provide a certain positive pressure for the ring-shaped crushing chamber 11. A driving mechanism 4 is arranged at the end of the connecting shaft 33 away from the air supplement mechanism 34, and is used to drive the rotor assembly 3 to rotate.

[0035] Specifically, in this embodiment, as shown in the figure, Figures 5-7 The air supplement mechanism 34 also includes a first connecting plate 342 and a second connecting plate 343. The first connecting plate 342 is connected to the end of the connecting shaft 33 away from the driving mechanism 4, and the second connecting plate 343 is connected to the ring-shaped crushing chamber 11. The two ends of the air supplement blade 341 are connected to the first connecting plate 342 and the second connecting plate 343, respectively. The material enters the side feed inlet 12 of the hammer mill, is initially impacted and beaten by the air supplement mechanism 34, and is then thrown around the ring-shaped crushing chamber 11, so that the material moves at high speed more uniformly in the ring-shaped crushing chamber 11. The air supplement mechanism 34 can provide a positive pressure for the ring-shaped crushing chamber 11 under negative pressure, effectively disturb the circulating layer, greatly improve the crushing effect, and the plurality of screens 21 form a 360-degree ring-shaped structure, breaking through the bottleneck of the limited area of the screen 21 caused by the original feed inlet 12 being arranged above. Therefore, the air supplement mechanism 34 and the screen assembly 2 cooperate to greatly improve the discharge efficiency of the material and the crushing.

[0036] Specifically, in the embodiment, as shown in the figure, Figures 5-8 The hammer mechanism 35 includes a hammer pin shaft 351, a limiting piece 352, and a plurality of hammer blades 353, the plurality of hammer blades 353 are sequentially and spacedly arranged along the axial direction of the annular crushing chamber 11, the two ends of the hammer pin shaft 351 are connected with the left hammer frame plate 31 and the right hammer frame plate 32 respectively, the hammer blade 353 is rotationally arranged on the hammer pin shaft 351, the hammer blades 353 of adjacent hammer mechanisms 35 in the embodiment are staggered and distributed in pairs along the axial direction of the annular crushing chamber 11; the limiting piece 352 includes a limiting body and a plurality of limiting grooves 3526, the limiting body includes a first limiting plate 3521, a first side plate 3522, and a second limiting plate 3523 connected in sequence, an avoiding through groove 3525 is formed between the first limiting plate 3521, the first side plate 3522, and the second limiting plate 3523, the hammer pin shaft 351 is located in the avoiding through groove 3525, the limiting groove 3526 is opened through the first limiting plate 3521 and the second limiting plate 3523, a plurality of limiting grooves 3526 are sequentially and spacedly arranged along the axial direction of the annular crushing chamber 11, one end of the hammer blade 353 is located in the limiting groove 3526; further, in the embodiment, the second limiting plate 3523 is further connected with a second side plate 3524, the second side plate 3524 is oppositely arranged with the first side plate 3522, the first limiting plate 3521, the first side plate 3522, the second limiting plate 3523, and the second side plate 3524 are of an integrated structure, the first side plate 3522 and the second side plate 3524 are both penetrated with overflow holes 3527, the overflow holes 3527 on the first side plate 3522 and the second side plate 3524 are oppositely arranged, the cross section of the limiting body is in the shape of G, the two ends of the limiting body are connected with the left hammer frame plate 31 and the right hammer frame plate 32 respectively by welding.

[0037] Specifically, in the embodiment, as shown in the figure, Figures 1-3 The driving mechanism 4 includes a machine base 41, a main shaft 42, a main shaft bearing seat 43, and a main motor 44, the machine base 41 is arranged on one side of the crushing chamber body 1, the main shaft bearing seat 43 and the main motor 44 are both arranged on the machine base 41, one end of the main shaft 42 is connected with the coupling shaft 33, the other end of the main shaft 42 penetrates through the main shaft bearing seat 43 and is connected with the output end of the main motor 44 through a shaft coupling 45. The structure of the driving mechanism 4 is simple and reliable, the transmission is stable, the technology is mature, and the cost is low.

[0038] It is convenient to open the control door 15 to carry out maintenance and repair operations such as dismounting and mounting the screen 21, in the embodiment, as shown in the figures, Figure 1 , Figure 2 and Figure 4 The radial two sides of the crushing chamber body 1 are both provided with a control door 15, the annular crushing chamber 11 is exposed after the control door 15 is opened.

[0039] The working principle is as follows:

[0040] First, start the main motor 44, the main motor 44 drives the main shaft 42 to rotate, the main shaft 42 drives the rotor assembly 3 to rotate, and the material enters from the side feed port 12 of the crusher, is preliminarily impacted and beaten by the high-speed rotating air supply blade 341, and is thrown to the periphery of the annular crushing chamber 11, so that the material moves at high speed in the annular crushing chamber 11 more uniformly, and the high-speed rotation of the air supply blade 341 can provide a positive pressure for the negative pressure annular crushing chamber 11, effectively disturb the annular flow layer, and greatly improve the crushing effect; at the same time, under the impact of the high-speed rotating hammer piece 353, the material and the hammer piece 353, the material and the screen 21, the material and the re-crushing chamber 14, and the material and the material between each other produce impact, shear and grinding effects, and the material particles break in this process to form small particles. When the material is repeatedly crushed to a certain fineness, i.e. the particle diameter is smaller than the pore size of the screen 21, it is discharged from the discharge port 13 of the crusher under the action of its own centrifugal force and the pressure difference between the air flow inside and outside the screen 21. Among them, the high-speed rotation of the air supply blade 341 drives the airflow in the annular crushing chamber 11, provides a positive pressure for the annular crushing chamber 11, effectively disturbs the annular flow layer, and the material is more easily brought out of the annular crushing chamber 11 through the screen 21, greatly improving the discharge efficiency, crushing effect and crushing efficiency.

[0041] The hammer piece mechanism 35 of the present application does not need to make a small spacer sleeve for limiting the hammer piece 353. When installing the hammer piece 353, the hammer piece 353 only needs to be inserted into the limiting groove 3526 in sequence, and then fixed by passing the hammer pin shaft 351 through the pin shaft hole of the hammer piece 353, which greatly saves the time for replacing the hammer piece 353, improves the work efficiency, and reduces the labor cost.

[0042] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacement or change according to the technical solution and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A hammer mill of the ring mill structure type, characterized in that: The utility model relates to a kind of pulverizing chamber, which comprises pulverizing chamber body (1), the inside of the pulverizing chamber body (1) forms annular pulverizing chamber (11), the axis of the annular pulverizing chamber (11) is horizontally arranged, the side of the pulverizing chamber body (1) is equipped with feed inlet (12) with annular pulverizing chamber (11) intercommunication, the feed inlet (12) is opposite to the axis of annular pulverizing chamber (11) arrangement, the bottom of the pulverizing chamber body (1) is equipped with discharge outlet (13) with annular pulverizing chamber (11) intercommunication, multiple re-pulverizing chambers (14) are sequentially arranged around the circumference of the annular pulverizing chamber (11); Screen assembly (2), the screen assembly (2) includes multiple screens (21), multiple screens (21) are sequentially arranged around the circumference of the annular pulverizing chamber (11) and form a circular ring, and each re-pulverizing chamber (14) is located between adjacent screens (21) respectively; And rotor assembly (3), the rotor assembly (3) is arranged in annular pulverizing chamber (11), the axis of the rotor assembly (3) is coincident with the axis of annular pulverizing chamber (11) arrangement, the rotor assembly (3) includes left hammer frame plate (31), right hammer frame plate (32), coupling shaft (33), air supplement mechanism (34) and multiple groups of hammer piece mechanism (35), left hammer frame plate (31) and right hammer frame plate (32) are arranged at two sides of hammer piece mechanism (35) respectively, multiple groups of hammer piece mechanism (35) are sequentially and spaced apart around the circumference of the coupling shaft (33), the air supplement mechanism (34) includes multiple air supplement blades (341), multiple air supplement blades (341) are sequentially and spaced apart at one end of the coupling shaft (33) around the circumference of the coupling shaft (33), the air supplement mechanism (34) is arranged close to feed inlet (12), the air supplement mechanism (34) is used to provide certain positive pressure for annular pulverizing chamber (11);The end of the coupling shaft (33) away from the air supplement mechanism (34) is provided with driving mechanism (4), and the driving mechanism (4) is used to drive the rotation of the rotor assembly (3); The air supplement mechanism (34) further includes first connecting plate (342) and second connecting plate (343), the first connecting plate (342) is connected with the end of the coupling shaft (33) away from the driving mechanism (4), the second connecting plate (343) is connected with annular pulverizing chamber (11), and both ends of the air supplement blade (341) are connected with the first connecting plate (342) and the second connecting plate (343) respectively. ​ The hammer mechanism (35) comprises a hammer pin shaft (351), a limiting piece (352) and a plurality of hammers (353), the plurality of hammers (353) are sequentially and spacedly arranged along the axial direction of the annular crushing chamber (11), the two ends of the hammer pin shaft (351) are connected with the left hammer frame plate (31) and the right hammer frame plate (32) respectively, and the hammer (353) is rotationally arranged on the hammer pin shaft (351); the limiting piece (352) comprises a limiting body and a plurality of limiting grooves (3526), the limiting body comprises a first limiting plate (3521), a first side plate (3522) and a second limiting plate (3523) which are sequentially connected, an avoiding through groove (3525) is formed between the first limiting plate (3521), the first side plate (3522) and the second limiting plate (3523), the hammer pin shaft (351) is located in the avoiding through groove (3525), the limiting groove (3526) is formed through the first limiting plate (3521) and the second limiting plate (3523), and a plurality of limiting grooves (3526) are sequentially and spacedly arranged along the axial direction of the annular crushing chamber (11); one end of the hammer (353) is located in the limiting groove (3526). The material enters from the side feeding port (12) of the crusher, is initially impacted and crushed by the rotating air supplementing blade (341), is thrown to the periphery of the annular crushing chamber (11) and is further crushed by the hammer (353), and the air supplementing blade (341) rotationally provides a certain positive pressure for the annular crushing chamber (11) under negative pressure, disturbs the annular flow layer, and the hammer (353) swinging on the hammer pin shaft (351) also disturbs the annular flow layer.

2. The hammer mill of ring-shaped pulverizing chamber structure according to claim 1, characterized in that: The driving mechanism (4) comprises a base (41), a main shaft (42), a main bearing seat (43) and a main motor (44), the base (41) is arranged on one side of the crushing chamber main body (1), the main bearing seat (43) and the main motor (44) are both arranged on the base (41), one end of the main shaft (42) is connected with the connecting shaft (33), and the other end of the main shaft (42) penetrates through the main bearing seat (43) and is connected with the output end of the main motor (44) through the shaft coupling (45).

3. The hammer mill of ring-shaped pulverizing chamber structure according to claim 1, characterized in that: Radial sides of the crushing chamber main body (1) are both provided with control doors (15), and the annular crushing chamber (11) is exposed after the control door (15) is opened.

4. The hammer mill of ring-shaped pulverizing chamber structure according to claim 1, characterized in that: The second side plate (3524) is arranged opposite to the first side plate (3522), the first limiting plate (3521), the first side plate (3522), the second limiting plate (3523) and the second side plate (3524) are in an integrated structure, the limiting body has a G-shaped cross section, and the two ends of the limiting body are connected with the left hammer frame plate (31) and the right hammer frame plate (32) through welding respectively.

5. The hammer mill of ring-shaped pulverizing chamber structure according to claim 4, characterized in that: Flow holes (3527) are formed through the first side plate (3522) and the second side plate (3524), and the flow holes (3527) on the first side plate (3522) and the second side plate (3524) are arranged opposite to each other.

6. The hammer mill of ring-shaped pulverizing chamber structure according to claim 1, characterized in that: The hammers (353) of the hammer mechanisms (35) adjacent to each other are staggered in pairs along the axial direction of the annular crushing chamber (11).

7. The hammer mill of any one of claims 1 to 6, wherein: The number of the screen meshes (21) is three, and the number of the re-crushing chambers (14) is also three.

8. The hammer mill of ring-shaped pulverizing chamber structure according to claim 7, characterized in that: The screen meshes (21) are arranged on the annular inner wall of the annular crushing chamber (11) through a pressing screen frame (22).

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