Bowl type coal mill

Abstract

The invention relates to a bowl type coal mill which comprises a coal mill body, a feed screening unit is installed at a feed inlet in the upper portion of the coal mill body, and the feed screening unit comprises a feed hopper fixedly connected to the upper side of the coal mill body. Wherein a material spreading mechanism, a metal scrap screening mechanism and an automatic metal scrap removing mechanism matched with the metal scrap screening mechanism are sequentially arranged on the feeding hopper from the feeding end to the discharging end; according to the scheme, in the feeding process, by arranging the spreading mechanism, the coal pile can be spread before metal waste in the coal pile is sorted, and therefore the phenomenon that the metal waste is accumulated in the deep position of the coal pile and cannot be effectively adsorbed through magnetic force is reduced.

Description

Technical Field

[0001] The invention relates to a bowl type coal mill and belongs to the technical field of coal mills. Background Art

[0002] During the use of the coal mill, in order to ensure the wear resistance of the coal mill, a screening unit is usually set at the feed of the coal mill to screen the metal in the coal block to avoid damage to the coal mill due to grinding the metal; such as the magnetic feed port of the coal mill of the Chinese patent coal powder combustion boiler with the authorization announcement number CN202238254U, its iron removal efficiency can reach more than 60%, which can effectively solve the problem that the coal used for the coal powder combustion boiler cannot be mixed with iron blocks; but since the coal blocks are usually a large number of coal blocks piled together during feeding, the metal waste accumulated in the deep of the coal pile cannot be effectively separated by magnetic force, resulting in unsuccessful separation, and when there is a lot of metal waste adhering to the equipment, it is easy to affect its magnetic release, resulting in a small release of magnetic force and unable to magnetically separate the metal waste in the coal pile; therefore, the magnetic separation method in the prior art cannot stably and effectively separate the metal waste in the coal pile by magnetic force during the coal mill feeding process. Therefore, a new solution is urgently needed to solve the above technical problems. Summary of the invention

[0003] The present invention is aimed at the problems existing in the prior art and provides a bowl-type coal mill. The technical solution can effectively and stably sort the metal waste in the coal pile by magnetic force during the feeding process.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a bowl-type coal mill, comprising a coal mill main body, a feed screening unit is installed at the feed inlet on the upper part of the coal mill main body, the feed screening unit comprises a feed hopper fixedly connected to the upper side of the coal mill main body, and the feed hopper is provided with a spreading mechanism, a metal waste screening mechanism and an automatic metal waste removal mechanism compatible with the metal waste screening mechanism in sequence from the feed end to the discharge end.

[0005] Furthermore, the material spreading mechanism includes a plurality of tooth plates horizontally slidably connected to the inner wall of the lower side of the feed hopper and a driving member fixedly connected to the outer side of the feed hopper, and the plurality of tooth plates and the driving member are connected by a connecting rod assembly.

[0006] Furthermore, the tooth plate includes a main plate horizontally slidably connected to the lower inner wall of the feed hopper, one end of the tooth plate is connected to the connecting rod assembly, and a plurality of material dividing teeth are fixedly connected to the main plate.

[0007] Furthermore, the driving component includes a second driving motor and a driving rail, the driving rail and the connecting rod assembly are fixedly connected to one end away from the main board, the second driving motor is fixedly connected to the coal mill body, the output end of the second driving motor is fixedly connected to a rotating arm, the rotating arm is fixedly connected to a driving round rod at a position away from the output end of the second driving motor, and the driving round rod is slidably connected to the inside of the driving rail.

[0008] Furthermore, the connecting rod assembly includes a cross bar located on the upper side of the feed hopper, one end of the cross bar is fixedly connected to the drive rail, the other end of the cross bar is fixedly connected to a cross connecting rod, a plurality of branch rods are fixedly connected to the cross connecting rod, and the plurality of branch rods are respectively fixedly connected to a plurality of main boards.

[0009] Furthermore, the metal waste screening mechanism includes a height adjustment seat assembled on the feed hopper, and the height adjustment seat is equipped with a magnetic ring located inside the feed hopper and a third drive motor that provides kinetic energy to the magnetic ring.

[0010] Furthermore, the height adjustment seat includes two side brackets respectively fixedly connected to the side walls on both sides of the feed hopper, the two side brackets are slidably connected to the inside of a slide seat, the magnetic ring is rotatably connected between the two slide seats, and the third drive motor is fixedly connected to one of the slide seats, the output end of the third drive motor is fixedly connected to the magnetic ring, the upper sides of the two side brackets are threadedly connected to a screw, and the lower part of the screw is rotatably connected to the slide seat.

[0011] Furthermore, the automatic metal scrap removal mechanism includes a transverse bracket fixedly connected to the slide seat, a waste storage box is fixedly connected to the transverse bracket, a picking plate is fixedly connected to the top of the side wall of the waste storage box close to the magnetic circle, the end of the picking plate away from the waste storage box is inclined upward, and the end of the picking plate away from the waste storage box is located at the upper part of the magnetic circle close to the waste storage box, and a pushing assembly located between the picking plate and the magnetic circle is also fixedly connected to the transverse bracket.

[0012] Furthermore, the pusher assembly includes a first drive motor fixedly connected to the cross bracket, the output end of the first drive motor is fixedly connected to a transmission shaft, the outer side of the transmission shaft is fixedly connected to a plurality of elastic frames in a ring array, and the plurality of elastic frames are equipped with pusher plates. The elastic frame includes a first C-shaped frame fixedly connected to the transmission shaft, a second C-shaped frame fixedly connected to the pusher plate is slidably connected to the first C-shaped frame, and a plurality of elastic members are arranged between the first C-shaped frame and the second C-shaped frame, and the elastic members can automatically expand the second C-shaped frame after it is contracted, and automatically adjust the length of the elastic frame.

[0013] Compared with the prior art, the present invention has the following advantages: in the feeding process, the present solution can flatten the coal pile before sorting the metal waste in the coal pile by setting a spreading mechanism, thereby reducing the phenomenon that the metal waste accumulates deep in the coal pile and cannot be effectively adsorbed by magnetic force. The present solution uses the metal waste automatic removal mechanism to clean the metal waste adhered to the magnetic ring, which can effectively avoid the phenomenon that the metal waste in the coal pile cannot be magnetically sorted due to the small released magnetic force caused by the large amount of metal waste adhered to the magnetic ring affecting its magnetic release. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the feed screening unit of the present invention;

[0016] Figure 3 It is a structural schematic diagram of the material spreading mechanism of the present invention;

[0017] Figure 4 It is a schematic diagram of the tooth plate structure of the present invention;

[0018] Figure 5 It is a structural schematic diagram of the connecting rod assembly and the driving member of the present invention;

[0019] Figure 6 It is a partial structural schematic diagram of the automatic removal mechanism of metal waste of the present invention;

[0020] Figure 7 It is a structural schematic diagram of the pusher assembly of the present invention;

[0021] Figure 8 It is a structural schematic diagram of the elastic frame of the present invention.

[0022] Explanation of the numbers in the figure: 1. Coal mill body; 2. Feed screening unit; 3. Feed hopper; 4. Material spreading mechanism; 5. Magnetic coil; 6. Automatic metal scrap removal mechanism; 61. Scrap storage box; 62. Cross bracket; 63. Picking plate; 64. First drive motor; 65. Transmission shaft; 66. Elastic frame; 661. First C-shaped frame; 662. Second C-shaped frame; 663. Elastic member; 67. Push plate; 7. Tooth plate; 71. Main board; 72. Material dividing teeth; 8. Connecting rod assembly; 81. Cross bar; 82. Cross connecting rod; 83. Branch rod; 9. Driving member; 91. Second drive motor; 92. Rotating arm; 93. Driving round rod; 94. Driving rail; 10. Side bracket; 11. Sliding seat; 12. Screw; 13. Third drive motor. DETAILED DESCRIPTION

[0023] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0024] Example 1: Please refer to Figure 1-8 A bowl-type coal mill comprises a coal mill body 1, which can be divided into four parts from bottom to top along the height direction: a driving device, a grinding component, a drying and separation space, and a coal powder separation and distribution device;

[0025] The working process is as follows: driven by an electric motor, the grinding disc or grinding ring is driven to rotate through a reduction device and a vertically arranged main shaft. The raw coal enters the surface of two sets of relatively moving grinding parts through a coal drop pipe, is squeezed and ground under the action of the pressing force, and is crushed into coal powder. The ground coal powder rotates with the grinding parts, and is thrown to the top of the wind ring under the centrifugal force and the pushing action of the continuously ground coal and coal powder. The hot air (desiccant) enters the annular drying space at a certain wind speed after being rectified by the wind ring equipped with equal flow guide blades. , dries the coal powder and brings it into the coal powder separator on the top of the pulverizer. Unqualified coarse coal powder is separated in the separator and returned to the grinding area for re-grinding through the bottom of the conical separator. Qualified coal powder is taken out of the mill by the desiccant through the coal powder distributor, enters the primary air duct, and directly enters the furnace through the burner to participate in combustion. The difficult-to-grind coal gangue and stones carried in the coal are also thrown above the wind ring during the coal grinding process. Because the wind speed is not enough to carry them, they fall down and fall into the debris box through the wind ring. The coal discharged from the debris box is called stone coal.

[0026] In order to prevent the grinding parts of the coal mill body 1 from grinding the metal waste mixed in the coal blocks and affecting its wear resistance, the present technical solution selects to install a feed screening unit 2 on the coal mill body 1, and since the upper part of the coal mill body 1 has a large installation area, the installation position of the feed screening unit 2 is the feed inlet on the upper part of the coal mill body 1, and the metal waste mixed in the coal blocks is screened by the feed screening unit 2 during the feeding process;

[0027] Specifically, the feed screening unit 2 includes a feed hopper 3 fixedly connected to the upper side of the coal mill body 1, the longitudinal section of the feed hopper 3 is U-shaped, and the end of the feed hopper 3 away from the coal mill body 1 is the feed end of the feed hopper 3, and the end of the feed hopper 3 close to the coal mill body 1 is the discharge end of the feed hopper 3. At this time, the feed end of the feed hopper 3 is inclined upward, so that the feed hopper 3 forms a slope. When the coal block falls into the inside of the feed hopper 3, the gravity of the coal block can be used to move it toward the direction close to the feed port of the coal mill body 1;

[0028] At the same time, in order to better screen the metal waste mixed in the coal block, the feed hopper 3 is provided with a material spreading mechanism 4, a metal waste screening mechanism and a metal waste automatic removal mechanism 6 adapted to the metal waste screening mechanism in sequence from the feed end to the discharge end;

[0029] Among them, see Figure 2-4As shown, the material spreading mechanism 4 is used to spread the coal piled together, reduce the thickness of the coal pile, and allow the metal waste to be exposed as much as possible;

[0030] Specifically, the material spreading mechanism 4 includes a plurality of tooth plates 7 horizontally slidably connected to the inner wall of the lower side of the feed hopper 3 and a driving member 9 fixedly connected to the outer side of the feed hopper 3. The plurality of tooth plates 7 and the driving member 9 are connected by a connecting rod assembly 8. At this time, by starting the driving member 9, the driving member 9 can drive the tooth plate 7 to slide horizontally through the connecting rod assembly 8. When the tooth plate 7 slides horizontally, it will repeatedly push the coal material inside the feed hopper 3 to spread the coal material as flat as possible.

[0031] The structure of the tooth plate 7 can be various. In order to explain it more conveniently, the present technical solution discloses one of them here. For example, the tooth plate 7 includes a main board 71 horizontally slidably connected to the lower inner wall of the feed hopper 3. One end of the tooth plate 7 is connected to the connecting rod assembly 8. A plurality of dividing teeth 72 are fixedly connected to the main board 71. When the main board 71 slides horizontally, the dividing teeth 72 are driven to move, and the coal pile is spread flat when the dividing teeth 72 move.

[0032] Similarly, one structure of the driving member 9 can be that the driving member 9 includes a second driving motor 91 and a driving rail 94, and the driving rail 94 is fixedly connected to the end of the connecting rod assembly 8 away from the main board 71. The second driving motor 91 is fixedly connected to the coal mill body 1, and can also be fixedly connected to the feed hopper 3. Its specific installation position can be selected according to demand. The output end of the second driving motor 91 is fixedly connected to a rotating arm 92, and the position of the rotating arm 92 away from the output end of the second driving motor 91 is fixedly connected to a driving round rod 93, and the driving round rod 93 is slidably connected to the inside of the driving rail 94. At this time, by starting the second driving motor 91, the rotating arm 92 can be driven to rotate. When the rotating arm 92 rotates, it will drive the driving round rod 93 to revolve. When the driving round rod 93 rotates, it will drive the driving rail 94 to repeatedly slide horizontally, so that the driving rail 94 provides kinetic energy for repeated movement of the tooth plate 7 through the connecting rod assembly 8.

[0033] Furthermore, in order to avoid grooves being made on the side wall of the feed hopper 3 and allowing coal blocks to leak through the grooves, the connecting rod assembly 8 includes a cross bar 81 located on the upper side of the feed hopper 3, one end of the cross bar 81 is fixedly connected to the drive rail 94, and the other end of the cross bar 81 is fixedly connected to a cross connecting rod 82, and a plurality of branch rods 83 are fixedly connected to the cross connecting rod 82, and the plurality of branch rods 83 are respectively fixedly connected to a plurality of main boards 71. By making the structural arrangement of the cross bar 81, the cross connecting rod 82 and the branch rod 83, the connecting rod assembly 8 can form an inverted U-shaped structure, so that the connecting rod assembly 8 does not contact the feed hopper 3.

[0034] See also Figure 2As shown, the metal waste screening mechanism includes a height adjustment seat assembled on the feed hopper 3, on which is mounted a magnetic coil 5 located inside the feed hopper 3 and a third drive motor 13 providing kinetic energy to the magnetic coil 5. At this time, by adjusting the height of the magnetic coil 5 through the height adjustment seat, the distance between the lower side of the magnetic coil 5 and the lower inner wall of the feed hopper 3 can be adjusted, so that the magnetic coil 5 can better adapt to coal piles of different thicknesses. The magnetic coil 5 can be made of magnets, and the metal waste in the coal pile can be sorted by magnetic force.

[0035] The height adjustment seat includes two side brackets 10 respectively fixedly connected to the side walls of the feed hopper 3 on both sides, and the inside of the two side brackets 10 are slidably connected with a slide seat 11, the magnetic ring 5 is rotatably connected between the two slide seats 11, and the third drive motor 13 is fixedly connected to one of the slide seats 11, the output end of the third drive motor 13 is fixedly connected to the magnetic ring 5, and the magnetic ring 5 can be driven to rotate by starting the third drive motor 13, the upper sides of the two side brackets 10 are threadedly connected with a screw rod 12, and the lower part of the screw rod 12 is rotatably connected to the slide seat 11. When the screw rod 12 rotates, it will move vertically on the side bracket 10, and when the screw rod 12 moves vertically, it will drive the slide seat 11 to move together to adjust the height of the slide seat 11, and when the height of the slide seat 11 is adjusted, the magnetic ring 5 will be driven to adjust together.

[0036] See also Figure 2 and Figure 6-8 As shown, the specific structure of the automatic metal scrap removal mechanism 6 is disclosed in detail herein, which is that the automatic metal scrap removal mechanism 6 includes a horizontal bracket 62 fixedly connected to the slide seat 11, and a waste storage box 61 is fixedly connected to the horizontal bracket 62. The waste storage box 61 is a structure with an upper opening, and a picking plate 63 is fixedly connected to the top of the side wall of the waste storage box 61 close to the magnetic circle 5. The end of the picking plate 63 away from the waste storage box 61 is inclined upward, and the end of the picking plate 63 away from the waste storage box 61 is located at the upper part of the magnetic circle 5 close to the waste storage box 61. At this time, when the magnetic circle 5 rotates, the metal scraps adsorbed on its surface will gradually contact the picking plate 63, be cut off by the picking plate 63, fall onto the picking plate 63, and then slide along the slope of the picking plate 63 to the inside of the waste storage box 61.

[0037] At the same time, in order to prevent metal waste from accumulating between the picking plate 63 and the magnetic ring 5, the cross bracket 62 is also fixedly connected to a pushing assembly located between the picking plate 63 and the magnetic ring 5, which is used to push the metal waste between the picking plate 63 and the magnetic ring 5 onto the picking plate 63.

[0038] The pushing assembly includes a first driving motor 64 fixedly connected to the cross bracket 62, the output end of the first driving motor 64 is fixedly connected to a transmission shaft 65, the outer side of the transmission shaft 65 is fixedly connected to a plurality of elastic frames 66 in a ring array, and a plurality of elastic frames 66 are each equipped with a pushing plate 67. At this time, the output of the first driving motor 64 can drive the pushing plate 67 to revolve, so that the pushing plate 67 pushes the metal waste, and at the same time, the elastic frame 66 adapts to the position change of the pushing plate 67.

[0039] Among them, the elastic frame 66 includes a first C-shaped frame 661 fixedly connected to the transmission shaft 65, and a second C-shaped frame 662 fixedly connected to the push plate 67 is slidably connected to the first C-shaped frame 661. A plurality of elastic members 663 are arranged between the first C-shaped frame 661 and the second C-shaped frame 662. At this time, the elastic members 663 can automatically unfold the second C-shaped frame 662 after it is contracted, thereby automatically adjusting the length of the elastic frame 66.

[0040] When in use: pour coal into the feed hopper 3, use the gravity of the coal to move it toward the feed port of the coal mill body 1, and at the same time, start the material spreading mechanism 4, the metal waste screening mechanism and the metal waste automatic removal mechanism 6;

[0041] After the material spreading mechanism 4 is started, it will drive the tooth plate 7 to slide horizontally, and use the material spreading teeth 72 to repeatedly push the coal blocks inside the feed hopper 3, so that the coal pile inside the feed hopper 3 is spread as flat as possible;

[0042] After the metal waste screening mechanism is started, it will drive the magnetic circle 5 to rotate, and use the magnetic force released by the magnetic circle 5 to adsorb the metal waste in the coal pile on the surface of the magnetic circle 5;

[0043] At this time, when the magnetic ring 5 rotates, it will drive the metal waste adhered to its surface to gradually contact the picking plate 63, and the metal waste will be cut off by the picking plate 63, fall onto the picking plate 63, and then slide along the slope of the picking plate 63 to the inside of the waste storage box 61;

[0044] At the same time, the first driving motor 64 is started, and the push plate 67 can be driven to revolve through the output of the first driving motor 64, so that the push plate 67 pushes the metal waste so that it can fall onto the picking plate 63;

[0045] In summary, the technical solution can flatten the coal pile before sorting the metal waste in the coal pile by setting up the spreading mechanism 4 during the feeding process, thereby reducing the phenomenon that the metal waste accumulates deep in the coal pile and cannot be effectively adsorbed by magnetic force. At the same time, the metal waste automatic removal mechanism 6 is used to clean the metal waste adhered to the magnetic ring 5, which can effectively avoid the phenomenon that the metal waste in the coal pile cannot be magnetically sorted due to the large amount of metal waste adhered to the magnetic ring 5 affecting its magnetic release and resulting in a small released magnetic force.

[0046] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A bowl type coal mill, characterized in that: The bowl-type coal mill includes a coal mill body, and a feed screening unit is installed at the feed inlet on the upper part of the coal mill body. The feed screening unit includes a feed hopper fixedly connected to the upper side of the coal mill body, wherein the feed hopper is provided with a material spreading mechanism, a metal waste screening mechanism and an automatic metal waste removal mechanism compatible with the metal waste screening mechanism in sequence from the feed end to the discharge end.

2. The bowl type coal mill according to claim 1, characterized in that: The material spreading mechanism comprises a plurality of tooth plates horizontally slidably connected to the inner wall of the lower side of the feed hopper and a driving member fixedly connected to the outer side of the feed hopper. The plurality of tooth plates and the driving member are connected by a connecting rod assembly.

3. The bowl type coal mill according to claim 2, characterized in that: The tooth plate comprises a main plate horizontally slidably connected to the inner wall of the lower side of the feed hopper, one end of the tooth plate is connected to the connecting rod assembly, and a plurality of material dividing teeth are fixedly connected to the main plate.

4. The bowl type coal mill according to claim 3, characterized in that: The driving member includes a second driving motor and a driving rail, the driving rail is fixedly connected to an end of the connecting rod assembly away from the main board, the second driving motor is fixedly connected to the coal mill body, the output end of the second driving motor is fixedly connected to a rotating arm, the rotating arm is fixedly connected to a driving round rod at a position away from the output end of the second driving motor, and the driving round rod is slidably connected to the inside of the driving rail.

5. A bowl type coal mill according to claim 4, characterized in that: The connecting rod assembly includes a cross bar located on the upper side of the feed hopper, one end of the cross bar is fixedly connected to the drive rail, the other end of the cross bar is fixedly connected to a cross connecting rod, a plurality of branch rods are fixedly connected to the cross connecting rod, and the plurality of branch rods are respectively fixedly connected to a plurality of main boards.

6. The bowl type coal mill according to claim 5, characterized in that The metal scrap screening mechanism comprises a height adjustment seat mounted on the feed hopper, on which a magnetic ring located inside the feed hopper and a third driving motor providing kinetic energy to the magnetic ring are mounted.

7. The bowl type coal mill according to claim 6, characterized in that The height adjustment seat includes two side brackets respectively fixedly connected to the side walls on both sides of the feed hopper, the two side brackets are slidably connected with a slide seat inside, the magnetic ring is rotatably connected between the two slide seats, and the third drive motor is fixedly connected to one of the slide seats, the output end of the third drive motor is fixedly connected to the magnetic ring, the upper sides of the two side brackets are threadedly connected with a screw, and the lower part of the screw is rotatably connected to the slide seat.

8. The bowl type coal mill according to claim 7, characterized in that: The automatic metal scrap removal mechanism includes a transverse bracket fixedly connected to a slide seat, a waste storage box is fixedly connected to the transverse bracket, a picking plate is fixedly connected to the top of the side wall of the waste storage box close to the magnetic circle, the end of the picking plate away from the waste storage box is inclined upward, and the end of the picking plate away from the waste storage box is located at the upper part of the magnetic circle close to the waste storage box, and a pushing assembly located between the picking plate and the magnetic circle is also fixedly connected to the transverse bracket.

9. The bowl type coal mill according to claim 8, characterized in that: The pusher assembly includes a first drive motor fixedly connected to a transverse bracket, an output end of the first drive motor is fixedly connected to a transmission shaft, a plurality of elastic frames in a circular array are fixedly connected to the outer side of the transmission shaft, and pusher plates are mounted on the plurality of elastic frames.

10. The bowl type coal mill according to claim 9, characterized in that: The elastic frame includes a first C-shaped frame fixedly connected to the transmission shaft, a second C-shaped frame fixedly connected to the push plate is slidably connected to the first C-shaped frame, and a plurality of elastic members are arranged between the first C-shaped frame and the second C-shaped frame. The elastic members can automatically expand the second C-shaped frame after it is contracted, thereby automatically adjusting the length of the elastic frame.

Images