Double-cavity type flour mill

Abstract

The invention discloses a double-cavity flour mill, and relates to the field of flour mills, the double-cavity flour mill comprises a box shell, the middle of the interior of the box shell is a crushing cavity, the two ends of the interior of the box shell are discharging cavities, the crushing cavity is provided with a feeding port in a penetrating mode, the discharging cavities are provided with discharging ports in a penetrating mode, crushing cutters are arranged in the crushing cavity, centrifugal wind wheels are arranged in the discharging cavities, and the crushing cutters and the centrifugal wind wheels are jointly connected with a main shaft; a filter plate is arranged between the smashing cavity and the discharging cavity and connected with the box shell through a plurality of elastic pieces, the elastic pieces apply elastic force towards the smashing cavity to the filter plate, and a touch assembly is arranged between the side, close to the discharging cavity, of the filter plate and the main shaft in an aligned mode. The position of the filter plate is positioned through the elastic supporting force of the elastic part and the negative pressure generated by the centrifugal wind wheel, and the filter plate is driven by the negative pressure to move towards the edge along with the increase of the blockage degree of the surface of the filter plate until the fixed contact part and the movable contact part are in rotary contact to vibrate the filter plate so as to be separated from blockages on the surface of the filter plate; good permeability of the filter plate is kept, and the crushing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of grinding mills, in particular to a double-chamber grinding mill. Background Art

[0002] The straw and wood grinder is used for ultra-fine grinding of lignified materials such as straw and wood. The materials are crushed by rotating cutters, and filters are set at the blast discharge position to ensure that the materials are fully ground before discharge.

[0003] The filter element is an important part of the grinding equipment, which effectively ensures the uniform fineness of the discharged powder. However, the filter element of the traditional grinding equipment is fixedly installed. The broken materials transmitted by the blast are easily blocked on the surface of the filter element. The fixed filter element cannot remove the materials. The continuous blockage greatly reduces the permeability of the filter element and reduces the crushing efficiency. Summary of the invention

[0004] In order to make up for the deficiencies of the existing technical problems, the purpose of the present invention is to provide a double-chamber grinding mill, which is used to solve the problem that the fixed filter element of the traditional grinding equipment cannot remove materials autonomously, the crushed materials are easily blocked on the surface of the filter element, and the permeability of the filter element is reduced, resulting in reduced crushing efficiency.

[0005] In order to solve the problems of the prior art, the technical solution of the present invention is as follows: A double-chamber grinding mill comprises a casing, wherein the middle part of the casing is a grinding chamber and both ends are discharge chambers, the grinding chamber is penetrated by a feeding port, the discharge chamber is penetrated by a discharge port, a grinding knife is arranged in the grinding chamber, a centrifugal wind wheel is arranged in the discharge chamber, the grinding knife and the centrifugal wind wheel are connected to a main shaft together, a filter plate is arranged between the grinding chamber and the discharge chamber, the filter plate is connected to the casing through a plurality of elastic members, the elastic members exert an elastic force on the filter plate toward the grinding chamber, a touch assembly is arranged between the side of the filter plate close to the discharge chamber and the main shaft, and the touch assembly can push the filter plate toward the grinding chamber by inclined extrusion.

[0006] Preferably, the elastic member comprises a sliding column, a telescopic slot parallel to the main axis is provided inside the box shell, the sliding column is elastically slidably plugged into the telescopic slot via a spring, and the sliding column fixes the edge of the filter plate.

[0007] Preferably, the contact assembly comprises a ring plate, which is positioned on the main shaft surface and located on the side of the filter plate close to the discharge cavity, and the corresponding surfaces of the ring plate and the filter plate are provided with relatively positioned moving contacts and fixed contacts.

[0008] Preferably, the movable contact and the fixed contact are parallel spiral inclined surfaces.

[0009] Preferably, the movable contact and the fixed contact are raised spherical blocks.

[0010] Preferably, the movable contact and the fixed contact are raised arc-shaped blocks.

[0011] Preferably, the main shaft is a hollow structure, a bidirectional screw is rotatably arranged inside the main shaft, a sliding core is symmetrically slidably arranged inside the main shaft, the bidirectional screw connects the two sliding cores with reverse threads, a sliding groove is opened on the surface of the main shaft, and the ring plate passes through the sliding groove and is fixedly connected to the sliding core.

[0012] Preferably, the ring plate is fixedly connected to the middle part of the sliding core, and the axial length of the sliding core is greater than twice the axial length of the sliding groove.

[0013] Preferably, the centrifugal wind wheel has a sleeve at its axial center, which rotates out of the casing, and the main shaft rotates through the inner side of the sleeve. The outer side of the sleeve has a groove, and an ear plate is rotatably installed in the groove. Positioning screws penetrate the surface of the ear plate, and the ear plate is fixed to either the main shaft or the casing by the positioning screws.

[0014] Compared with the prior art, the advantages of the present invention are as follows: 1. The present invention positions the filter plate through the elastic supporting force of the elastic member and the negative pressure generated by the centrifugal wind wheel. As the blockage degree of the filter plate surface increases, the negative pressure drives the filter plate to move toward the edge until the fixed contact member and the moving contact member rotate and contact to cause the filter plate to vibrate, which is used to separate the blockage on the filter plate surface, maintain the filter plate with good permeability, and improve the crushing efficiency.

[0015] 2. The present invention rotates the bidirectional screw rod to threadably push the two sliding cores to drive the ring plate and the moving contact to move synchronously in opposite directions, thereby adjusting the distance between the moving contact and the fixed contact, and adjusting the sensitivity of the filter plate to trigger the vibration mode.

[0016] 3. The present invention fixes the ear plate to the main shaft or the casing by screws, so that the centrifugal wind wheel is controlled not to participate in the rotation driving airflow, and only the centrifugal wind wheel on one side is kept rotating to drive the airflow, which is used to perform airflow backwashing on the filter plate on the other side, thereby maintaining the filter plate with high permeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall external structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the internal structure of the box shell of the present invention.

[0019] Figure 3 It is a schematic diagram of the elastic member installation structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the elastic member structure of the present invention.

[0021] Figure 5 It is a schematic diagram of the ring plate adjustment and installation structure of the present invention.

[0022] Figure 6 It is a schematic diagram of the locking structure of the centrifugal wind wheel and the casing of the present invention.

[0023] Figure 7 It is a schematic diagram of the locking structure of the centrifugal wind wheel and the main shaft of the present invention.

[0024] Figure 8 This is one of the schematic diagrams of the structure of the trigger assembly of the present invention.

[0025] Fig. 9 This is the second schematic diagram of the structure of the trigger assembly of the present invention.

[0026] Fig.10 This is the third schematic diagram of the structure of the touch assembly of the present invention.

[0027] Figure numerals: 1. box shell; 11. feeding port; 12. discharge port; 2. filter plate; 21. fixed contact; 3. elastic member; 31. sliding column; 32. telescopic groove; 33. corrugated sleeve; 4. main shaft; 41. sliding groove; 42. sliding core; 43. bidirectional screw; 5. crushing knife; 6. centrifugal impeller; 61. bushing; 62. embedded groove; 63. ear plate; 64. positioning screw; 7. ring plate; 71. moving contact. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] like Figure 1 , Figure 2 As shown, the double-chamber grinding mill is composed of a casing 1 as the main body, and the casing 1 is fixed by two halves. There is a cylindrical chamber inside the casing 1, the middle of the cylindrical chamber is a crushing chamber, and the two ends are discharge chambers. A feeding port 11 passes through the crushing chamber, and two discharge ports 12 respectively pass through the discharge chamber tangentially. The main shaft 4 rotates along the axial direction and passes through the casing 1. The crushing knife 5 is located in the crushing chamber and fixed to the main shaft 4. Two centrifugal impellers 6 are located in the discharge chamber and connected to the main shaft 4.

[0030] like Figure 2 , Figure 3 As shown, filter plates 2 are arranged at the intersection of the crushing chamber and the two discharge chambers. The center and edge of the filter plate 2 are both hard metal rings. A mesh surface is provided between the inner and outer metal rings. The middle of the filter plate 2 is slidably sleeved on the outside of the main shaft 4, and the edge of the filter plate 2 is slidably contacted with the inner wall of the box shell 1. like Figure 3 , Figure 4As shown, the edge of the filter plate 2 is axially elastically connected to the box shell 1 through a plurality of evenly distributed elastic members 3, the elastic member 3 includes a slide post 31, a telescopic groove 32 is provided on the inner wall of the box shell 1, the telescopic groove 32 is parallel to the main shaft 4, the slide post 31 is elastically slidably plugged with the telescopic groove 32 through a spring, and the outer end of the slide post 31 fixes the edge of the filter plate 2; like Figure 3 , Figure 8 , Fig. 9 , Fig.10 As shown, a contact assembly is arranged between the side of the filter plate 2 close to the discharge cavity and the main shaft 4, and the contact assembly includes a ring plate 7, which is positioned on the surface of the main shaft 4 and located on the side of the filter plate 2 close to the discharge cavity. The corresponding surfaces of the ring plate 7 and the filter plate 2 are provided with a relatively positioned moving contact 71 and a fixed contact 21, and the moving contact 71 and the fixed contact 21 are raised spherical blocks, raised arc blocks or parallel spiral inclined surfaces. One end of the main shaft 4 is connected to a driving device through a belt, which is used to drive the main shaft 4 to drive the crushing knife 5 and the centrifugal wind wheel 6 to rotate synchronously, and the material is fed into the crushing chamber from the feeding port 11. The rotating crushing knife 5 crushes the material, and the rotating centrifugal wind wheel 6 drives the air in the crushing chamber to be transmitted to the discharge chamber. The crushed material follows the air flow to the discharge chamber and is discharged from the discharge port 12. The filter plate 2 blocks the oversized material, so that the material is crushed to a set size before passing through the filter plate 2 and discharged; The elastic sliding column 31 is used to apply elastic force to the filter plate 2 in the direction of the crushing chamber, so that the filter plate 2 is close to the crushing chamber, and the fixed contact piece 21 and the moving contact piece 71 are not in contact. When the surface of the filter plate 2 is clogged, the permeability of the filter plate 2 is gradually reduced, and the air pressure in the discharge chamber is gradually reduced, which generates pressure in the direction of the discharge chamber on the filter plate 2, so that the filter plate 2 gradually moves in the direction of the discharge chamber, and the fixed contact piece 21 gradually approaches the moving contact piece 71. When the filter plate 2 is clogged to a certain extent, the filter plate 2 is moved until the fixed contact piece 21 contacts the moving contact piece 71. At this time, the rotating moving contact piece 71 pushes the fixed contact piece 21 to move in the direction of the crushing chamber, and the air pressure on the filter plate 2 causes the filter plate 2 to perform high-frequency reciprocating movement to produce a vibration effect, thereby promoting the falling off of the material blocked on the surface of the filter plate 2 and maintaining the good permeability of the filter plate 2. The more serious the blockage of the filter plate 2 is, the deeper the contact between the fixed contact 21 and the movable contact 71 is, the greater the vibration of the filter plate 2 is, and the material removal effect is positively correlated with the blockage degree.

[0031] like Figure 8 , Fig. 9 , Fig.10 As shown, the moving contact member 71 and the fixed contact member 21 are convex spherical blocks, convex arc blocks or parallel spiral inclined surfaces, all of which enable the moving contact member 71 and the fixed contact member 21 to slide against each other on the inclined surfaces to push the filter plate 2 to move.

[0032] like Figure 5As shown, the main shaft 4 is a hollow structure, a bidirectional screw 43 is rotatably installed in the main shaft 4, one end of the bidirectional screw 43 passes through the main shaft 4 and is fixed with a hexagonal end block, two sliding cores 42 are symmetrically slidably installed inside the main shaft 4, the bidirectional screw 43 is reversely threaded to connect the two sliding cores 42, a sliding groove 41 is provided on the surface of the main shaft 4, and the ring plate 7 passes through the sliding groove 41 and is fixedly connected to the sliding core 42; A wrench is used to rotate the bidirectional screw rod 43 to threadably push the two sliding cores 42 to drive the ring plate 7 and the moving contact 71 to move synchronously in opposite directions, thereby adjusting the distance between the moving contact 71 and the fixed contact 21 to adjust the sensitivity of the filter plate 2 to trigger the vibration mode.

[0033] The ring plate 7 is fixedly connected to the middle of the sliding core 42 , and the axial length of the sliding core 42 is greater than twice the axial length of the sliding groove 41 , ensuring that the sliding core 42 can block the sliding groove 41 in any way it is adjusted to prevent dust from entering the interior of the main shaft 4 through the sliding groove 41 .

[0034] like Figure 4 As shown, the edge of the filter plate 2 is fixedly connected to the sliding column 31 by screws, and the corrugated sleeve 33 is fixedly connected to the outer end of the sliding column 31. The other end of the corrugated sleeve 33 is sealed and fixed to the end of the telescopic groove 32, so that the corrugated sleeve 33 seals the sliding part of the sliding column 31 to prevent dust from affecting the sliding effect of the sliding column 31.

[0035] When the blocked material on the surface of the filter plate 2 cannot be completely separated by vibration, backwashing can be performed by air flow. The specific operation is as follows: like Figure 6 , Figure 7 As shown, the shaft sleeve 61 is fixed at the axial center of the centrifugal wind wheel 6, and the shaft sleeve 61 rotates through the end surface of the housing 1 through the bearing, and the shaft sleeve 61 is rotatably sleeved on the outer side of the main shaft 4 through the bearing, and an embedding groove 62 is provided at the outer end of the shaft sleeve 61, and the ear plate 63 is rotatably installed in the embedding groove 62, and the surface of the ear plate 63 passes through the positioning screw 64, and the ear plate 63 is fixed to the main shaft 4 or the housing 1 through the positioning screw 64; During normal crushing operation, the airflow driven by the centrifugal wind wheel 6 enters the crushing chamber from the outside through the feeding port 11, then passes through the filter plate 2 and enters the discharge chamber, and is finally discharged from the discharge port 12. For example, the right filter plate 2 is backwashed with airflow, the feeding port 11 is closed with a cover, the positioning screw 64 is turned to disconnect the fixed connection between the right ear plate 63 and the main shaft 4, the ear plate 63 is flipped to fit the right end surface of the box shell 1, and then the ear plate 63 is fixed to the box shell 1 with the positioning screw 64. At this time, the right centrifugal wind wheel 6 is rotationally connected to the main shaft 4, and the main shaft 4 is driven to drive the left centrifugal wind wheel 6 to rotate. The feeding port 11 is closed with a cover, and the external airflow can only enter the right discharge chamber through the right discharge port 12. The airflow passes through the right filter plate 2 to the left to peel off the blockage on the surface of the right filter plate 2, and then passes through the crushing chamber into the left discharge chamber, and is discharged from the left discharge port 12; The airflow backwashing operation for the left filter plate 2 is opposite to the above-mentioned method.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-chamber grinding mill, comprising a casing (1), wherein the middle of the casing (1) is a grinding chamber and both ends are discharge chambers, the grinding chamber is provided with a feeding port (11), the discharge chamber is provided with a discharge port (12), a grinding knife (5) is arranged in the grinding chamber, a centrifugal fan wheel (6) is arranged in the discharge chamber, the grinding knife (5) and the centrifugal fan wheel (6) are connected to a main shaft (4), characterized in that: A filter plate (2) is arranged between the pulverizing chamber and the discharge chamber, the filter plate (2) being connected to the housing (1) via a plurality of elastic members (3), the elastic members (3) applying elastic force to the filter plate (2) in the direction of the pulverizing chamber, a trigger assembly is arranged between the side of the filter plate (2) close to the discharge chamber and the main shaft (4), and the trigger assembly can push the filter plate (2) to move in the direction of the pulverizing chamber by means of an inclined surface extrusion; The contact assembly comprises a ring plate (7), the ring plate (7) being positioned on the surface of the main shaft (4) and located on a side of the filter plate (2) close to the discharge chamber, and the corresponding surfaces of the ring plate (7) and the filter plate (2) are provided with a moving contact piece (71) and a fixed contact piece (21) in opposite positions.

2. The double-chamber grinding mill according to claim 1, characterized in that: The elastic member (3) comprises a sliding column (31). A telescopic groove (32) parallel to the main shaft (4) is provided inside the box shell (1). The sliding column (31) is elastically slidably plugged into the telescopic groove (32) via a spring. The sliding column (31) fixes the edge of the filter plate (2).

3. The double-chamber grinding mill according to claim 1, characterized in that: The movable contact piece (71) and the fixed contact piece (21) are parallel spiral inclined surfaces.

4. The double-chamber grinding mill according to claim 1, characterized in that: The movable contact piece (71) and the fixed contact piece (21) are raised spherical blocks.

5. The double-chamber grinding mill according to claim 1, characterized in that: The movable contact piece (71) and the fixed contact piece (21) are convex arc-shaped blocks.

6. The double-chamber grinding mill according to claim 1, characterized in that: The main shaft (4) is a hollow structure. A bidirectional screw rod (43) is rotatably arranged inside the main shaft (4). A sliding core (42) is symmetrically slidably arranged inside the main shaft (4). The bidirectional screw rod (43) is threadedly connected to the two sliding cores (42) in opposite directions. A sliding groove (41) is provided on the surface of the main shaft (4). The ring plate (7) passes through the sliding groove (41) and is fixedly connected to the sliding core (42).

7. The double-chamber grinding mill according to claim 6, characterized in that: The ring plate (7) is fixedly connected to the middle part of the sliding core (42), and the axial length of the sliding core (42) is greater than twice the axial length of the sliding groove (41).

8. The double-chamber grinding mill according to claim 1, characterized in that: The centrifugal impeller (6) has a shaft sleeve (61) at its axial center. The shaft sleeve (61) rotates to pass through the casing (1). The main shaft (4) rotates to pass through the inner side of the shaft sleeve (61). The shaft sleeve (61) has an embedding groove (62) on its outer side. An ear plate (63) is rotatably mounted in the embedding groove (62). A positioning screw (64) passes through the surface of the ear plate (63). The ear plate (63) is fixed to either the main shaft (4) or the casing (1) by the positioning screw (64).

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