A coal mill

Abstract

The present invention relates to the technical field of material crushing and grinding, and specifically discloses a coal mill, including a machine base, on which a grinding disc, a grinding roller and a loading frame are arranged, the grinding roller rises and falls with the loading frame, a crushing assembly is arranged above the grinding disc, and the crushing assembly includes: a crushing rod, which is vertically slidably connected with the loading frame, and is used to crush the coal blocks on the grinding disc when the crushing rod descends, and a first spring is arranged between the crushing rod and the loading frame, and is used to make the crushing rod have a tendency to descend and reset; a guide member, which is fixedly connected with the crushing rod and is used to control the vertical movement of the crushing rod; a guide ring, which is fixedly connected with the grinding disc, and the guide member is in active contact with the guide ring, and a plurality of guide teeth are arranged on the guide ring, and when the guide ring rotates with the grinding disc, the guide teeth guide the guide member to move vertically, so as to realize the vertical movement of the crushing rod. The coal mill can quickly crush larger coal blocks, and improve the crushing capacity and crushing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of material crushing and grinding, and in particular to a coal mill. Background Art

[0002] Coal mill is a mechanical device that breaks coal blocks and grinds them into coal powder. It is an important auxiliary equipment for pulverized coal furnace. Coal mills can be divided into low-speed coal mills, medium-speed coal mills and high-speed coal mills according to the rotation speed of the coal grinding working parts. Common medium-speed coal mills include medium-speed roller-disc coal mills, which are efficient grinding equipment suitable for grinding medium-hardness materials such as bituminous coal and lean coal. The main structural components include the machine base, machine casing, main motor, grinding assembly, pressurizing assembly, hot air assembly and separation assembly. The grinding assembly includes grinding rollers and grinding discs. When the medium-speed roller coal mill is working, the main motor drives the grinding disc fixed on the reducer to rotate through the coupling. The coal feeder inputs the coal blocks from the central coal drop pipe of the coal mill, so that the coal blocks fall onto the rotating grinding disc. The grinding assembly grinds the coal blocks, the hot air assembly dries the coal and sends the coal powder to the separation assembly on the upper part of the grinding area. After separation, the coal powder of a certain particle size is carried out of the casing by the air flow, and the coarse coal powder returns to the grinding area for re-grinding.

[0003] A Chinese patent document with authorization announcement number CN106890705B discloses a medium-speed coal mill. The new grinding roller assembly adopts a centripetal arc waist-shaped roller sleeve (the roller sleeve grinding profile is arc-shaped), and the profile of the grinding disc tile matches the grinding roller sleeve, which reduces the linear speed difference between the grinding roller sleeve and the grinding disc tile, reduces the wear on the outer part of the roller sleeve, and increases the service life of easily worn parts. When the coal mill is working, the effective grinding area of ​​the grinding area between the grinding roller and the grinding disc tile is increased, so that the mass of raw coal falling in the grinding area between the grinding roller sleeve and the grinding disc tile is relatively increased, and the crushing efficiency of the raw coal is improved per unit time, thereby improving the output of the coal mill, which is more conducive to the stability of equipment operation.

[0004] In the above technical solution, when the coal block falling on the grinding disc is large in size, the larger coal block is between the grinding roller and the grinding disc, and the coal block is only crushed by the extrusion and grinding action between the grinding roller and the grinding disc. It is difficult to crush the coal block quickly, and it may take a longer time or higher power to ensure that the coal block is fully crushed. In addition, the larger coal block will also affect the crushing effect of other coal blocks, and the crushing efficiency is low. Summary of the invention

[0005] The present invention provides a coal mill, aiming to solve the problems of difficulty in quickly crushing larger coal lumps and low crushing efficiency existing in medium-speed coal mills in the related art.

[0006] A coal mill of the present invention comprises a machine base, on which a grinding disc, a grinding roller and a loading frame are arranged, the grinding roller rises and falls with the loading frame, a crushing assembly is arranged above the grinding disc, and the crushing assembly comprises: a crushing rod, the crushing rod is vertically slidably connected with the loading frame, and when the crushing rod descends, it is used to crush the coal blocks on the grinding disc, and a first spring is arranged between the crushing rod and the loading frame, which is used to make the crushing rod have a tendency to descend and reset; a guide member, the guide member is fixedly connected with the crushing rod and is used to control the vertical movement of the crushing rod; a guide ring, the guide ring is fixedly connected with the grinding disc, the guide member is in movably contact with the guide ring, a plurality of guide teeth are arranged on the guide ring, and when the guide ring rotates with the grinding disc, the guide teeth guide the guide member to move vertically to realize the vertical movement of the crushing rod. A crushing assembly is added above the grinding disc. The rotation of the grinding disc drives the guide ring to rotate, so that the guide teeth on the guide ring guide the guide member to move vertically, thereby controlling the vertical movement of the crushing rod. The elastic potential energy of the first spring is stored and released, so that the crushing rod can drop rapidly when it drops, and impact larger coal lumps. Combined with the grinding action of the grinding disc and the grinding roller, larger coal lumps can be crushed quickly, increasing the crushing forms, optimizing the crushing process, and improving the crushing capacity and efficiency of the coal mill.

[0007] Preferably, the guide tooth comprises a guide inclined surface and a guide vertical surface. When the guide ring rotates with the grinding disc, the guide inclined surface is used to guide the guide member to rise, and the guide vertical surface is used to guide the guide member to descend.

[0008] Preferably, the crushing assembly also includes a sleeve rod, which is fixed to the lower bottom surface of the loading frame, and the crushing rod is slidably sleeved in the sleeve rod. The top of the crushing rod is provided with a head for preventing the crushing rod from being separated from the sleeve rod, one end of the first spring is fixed to the head, and the other end of the first spring is fixed to the upper bottom surface of the loading frame.

[0009] Preferably, the sleeve rod is provided with a vertical groove, and the guide member is slidably matched with the vertical groove.

[0010] Preferably, the diameter of the crushing rod is matched with the inner diameter of the sleeve rod, and when the crushing rod rises, the bottom end of the crushing rod extends into the sleeve rod to clean the coal blocks attached to the crushing rod and make the coal blocks fall back onto the grinding disc, so as to reduce the attachment and residue of coal blocks on the crushing rod and improve the crushing efficiency.

[0011] Preferably, the crushing assembly further comprises a cap, which is sleeved outside the head to prevent coal from entering the cap and avoid damage to the first spring.

[0012] Preferably, a limit assembly is provided at the coal grinding concave surface of the grinding disc, and the limit assembly includes a limit baffle and a second spring. The grinding disc has a groove for installing the limit baffle, and the upper surface of the limit baffle is in an arc-shaped curved surface that matches the coal grinding concave surface of the grinding disc. The second spring is connected between the limit baffle and the groove, and the second spring is used to apply elastic force to the limit baffle so that the limit baffle protrudes from the coal grinding concave surface of the grinding disc to limit the movement of the coal block. This prevents the grinding roller from pushing the larger coal block to move in the coal grinding concave surface and making it difficult to grind, thereby improving the grinding effect. When the grinding roller or the crushing rod moves to the limit baffle, the limit baffle can be retracted into the groove to avoid the generation of a crushing dead angle.

[0013] Preferably, the guide member comprises a guide ring and a guide rod, a plurality of the guide rods are fixedly connected to each other via the guide ring, and the guide rod is fixedly connected to the breaking rod.

[0014] Preferably, the loading frame is provided with a roller bracket for mounting the grinding roller, and the roller bracket is provided with a scraper for cleaning the grinding roller, and the scraper has an arc groove adapted to the outer peripheral side of the grinding roller, so as to reduce the adhesion and residue of coal blocks on the surface of the grinding roller and improve the grinding efficiency.

[0015] Preferably, a casing is also provided on the machine base, a nozzle ring is provided on the outer peripheral side of the grinding disc, and a guide block located above the nozzle ring is provided on the inner wall of the casing. A material passing gap is provided between the guide block and the upper surface of the nozzle ring to allow crushed coal powder to enter the nozzle ring. The guide block is made of elastic material and has an arc-shaped surface to push uncrushed coal blocks back to the coal grinding concave surface of the grinding disc when the grinding disc rotates.

[0016] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: a crushing assembly and a limit assembly are added in the coal mill, and the crushing rod is caused to reciprocate between slow rising and fast falling through the rotation of the grinding disc to produce impact on larger coal lumps, increase the crushing form, and limit the movement of larger coal lumps to improve the grinding effect. In combination with the grinding action of the grinding disc and the grinding roller, larger coal lumps can be quickly crushed, the crushing process is optimized, and the crushing capacity and crushing efficiency of the coal mill are improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0019] Figure 3 It is a schematic structural diagram of a grinding assembly and a crushing assembly of a coal mill of the present invention.

[0020] Figure 4 It is a structural schematic diagram of the crushing assembly of the coal mill of the present invention.

[0021] Figure 5 It is a structural schematic diagram of the limiting assembly of the coal mill of the present invention.

[0022] Reference numerals:

[0023] 10. base; 110. main motor; 120. hydraulic cylinder; 130. hot air assembly; 140. separation assembly; 20. casing; 210. guide block; 220. coal drop pipe; 30. grinding disc; 310. groove; 320. nozzle ring; 40. grinding roller; 50. loading frame; 510. connecting part; 520. sleeve rod; 5210. vertical groove; 530. sleeve cap; 540. roller bracket; 550. scraper; 60. breaking rod; 610. first spring; 620. head; 70. guide member; 710. guide ring; 720. guide rod; 80. guide ring; 810. guide tooth; 820. guide inclined surface; 830. guide vertical surface; 840. connecting rod; 850. guide horizontal surface; 90. limit baffle; 910. second spring. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] like Figures 1 to 5 As shown, the coal mill of the present invention comprises a machine base 10, a machine casing 20, a main motor 110, a grinding assembly, a pressurizing assembly, a hot air assembly 130, a separating assembly 140, a crushing assembly and a limiting assembly. The machine casing 20, the grinding assembly, the pressurizing assembly, the separating assembly 140, the crushing assembly and the limiting assembly are respectively arranged on the machine base 10, the grinding assembly, the pressurizing assembly, the separating assembly 140, the crushing assembly and the limiting assembly are respectively located in the machine casing 20, and the hot air assembly 130 and the main motor 110 are respectively located outside the machine casing 20.

[0026] A coal drop pipe 220 and a guide block 210 are provided in the casing 20. The coal drop pipe 220 is vertically arranged at the center of the casing 20 for inputting coal blocks; the guide block 210 is fixed to the inner wall of the casing 20 and is located above the nozzle ring 320. There is a material gap between the guide block 210 and the upper surface of the nozzle ring 320 for allowing the crushed coal powder to enter the nozzle ring 320. The guide block 210 is made of elastic material, such as rubber, polyurethane, etc., and has an arc surface for pushing the uncrushed coal blocks back to the coal grinding concave surface of the grinding disc 30 for re-grinding when the grinding disc 30 rotates, so as to improve the crushing efficiency.

[0027] The pressurizing assembly includes a loading frame 50, a roller bracket 540 and a hydraulic cylinder 120. The loading frame 50 is triangular, and three roller brackets 540 are respectively fixed on the three sides of the loading frame 50 for mounting the grinding roller 40; a scraper 550 is provided on the roller bracket 540, and the scraper 550 has an arc groove adapted to the outer peripheral side of the grinding roller 40, and the scraper 550 is used to clean the grinding roller 40 to reduce the adhesion and residue of coal blocks and improve the grinding efficiency; the output ends of the three hydraulic cylinders 120 are respectively fixed to the three corners of the loading frame 50, and the hydraulic cylinders 120 are used to drive the loading frame 50 to rise and fall.

[0028] The grinding assembly includes a grinding disc 30 and a grinding roller 40. The grinding disc 30 includes a coal dropping boss, a coal grinding concave surface and a nozzle ring 320 which are sequentially distributed from the inside to the outside. The three grinding rollers 40 are located above the grinding disc 30 and are rotatably mounted on three roller brackets 540 respectively to rise and fall with the loading frame 50.

[0029] The crushing assembly includes a connecting portion 510 , a sleeve rod 520 , a crushing rod 60 , a first spring 610 , a sleeve cap 530 , a guide member 70 , a guide ring 80 and a connecting rod 840 .

[0030] The three connecting parts 510 are respectively fixed at the three inner corners of the loading frame 50, and are used to install the sleeve rod 520. The sleeve rod 520 is fixed on the lower bottom surface of the connecting part 510. The sleeve rod 520 has a vertical groove 5210. The crushing rod 60 is vertically slidably sleeved in the sleeve rod 520. The diameter of the crushing rod 60 is adapted to the inner diameter of the sleeve rod 520. The bottom end of the crushing rod 60 is conical and is located above the grinding disc 30. When the crushing rod 60 descends, it is used to crush the coal blocks on the grinding disc 30. When the crushing rod 60 rises, the bottom end of the crushing rod 60 extends into the sleeve rod 520. , which is used to clean the coal blocks attached to the crushing rod 60, so that the coal blocks fall back onto the grinding disc 30, reduce the adhesion and residue of coal blocks, and improve the crushing efficiency; a head 620 is provided at the top of the crushing rod 60 to prevent the crushing rod 60 from being separated from the sleeve rod 520, and a first spring 610 is provided between the head 620 and the connecting part 510 to make the crushing rod 60 have a tendency to descend and reset; the sleeve cap 530 is sleeved outside the head 620 and fixed to the upper bottom surface of the connecting part 510 to prevent coal from entering the sleeve cap 530 and avoid damage to the first spring 610.

[0031] The guide member 70 includes a guide ring 710 and guide rods 720. Three guide rods 720 are evenly fixed on the outer peripheral side of the guide ring 710. The guide rods 720 pass through the vertical slots 5210 and are fixedly connected to the crushing rod 60 to control the vertical movement of the crushing rod 60.

[0032] The bottom end of the guide ring 80 is fixed to the grinding disc 30 through four connecting rods 840 so as to rotate with the grinding disc 30. The guide ring 80 includes a plurality of guide teeth 810 evenly distributed along its circumference, and a guide groove with an opening facing upward is formed between two adjacent guide teeth 810. The guide teeth 810 include a guide inclined surface 820, a guide horizontal surface 850 and a guide vertical surface 830, and the guide rod 720 is in active contact with the guide ring 80. When the guide ring 80 rotates with the grinding disc 30, the guide inclined surface 820 guides the guide rod 720 in the guide groove to rise to the guide horizontal surface 850, and the guide vertical surface 830 guides the guide rod 720 to fall from the guide horizontal surface 850 to the guide groove, thereby causing the guide member 70 to reciprocate vertically to realize the vertical reciprocating movement of the crushing rod 60.

[0033] The limiting assembly includes a limiting baffle 90 and a second spring 910. The coal grinding concave surface of the grinding disc 30 is provided with a plurality of grooves 310 for installing the limiting baffle 90. The upper surface of the limiting baffle 90 is in the shape of an arc-shaped curved surface adapted to the coal grinding concave surface of the grinding disc 30. The second spring 910 is connected between the limiting baffle 90 and the groove 310. The second spring 910 is used to apply elastic force to the limiting baffle 90 so that the limiting baffle 90 protrudes from the coal grinding concave surface of the grinding disc 30, limits the movement of the coal block, prevents the grinding roller 40 from pushing the larger coal block to move in the coal grinding concave surface and making it difficult to grind, and improves the grinding effect. When the grinding roller 40 or the crushing rod 60 moves to the limiting baffle 90, the limiting baffle 90 can be retracted into the groove 310 to avoid the generation of a crushing dead angle.

[0034] The working process of coal mill is as follows:

[0035] (1) The main motor 110 drives the grinding disc 30 to rotate through the reducer, and the coal blocks fall from the coal drop pipe 220 onto the coal drop boss of the grinding disc 30 and move outwards under the action of centrifugal force.

[0036] (2) The hydraulic pressure generated by the hydraulic cylinder 120 is transmitted to the grinding roller 40, generating a grinding pressure between the grinding roller and the grinding disc 30, thereby grinding the coal.

[0037] (3) The guide ring 80 rotates with the grinding disc 30 and guides the guide member 70 to move back and forth vertically, so that the crushing rod 60 cycles back and forth between slow rise and fast fall. When the crushing rod 60 rises slowly, the first spring 610 is compressed to store elastic potential energy, and the bottom end of the crushing rod 60 extends into the sleeve rod 520 to clean the coal blocks attached to the crushing rod 60. When the crushing rod 60 falls quickly, the elastic potential energy stored in the first spring 610 is released to impact and crush the larger coal blocks.

[0038] (4) The limit baffle 90 can protrude relative to the coal grinding concave surface of the grinding disc 30 to limit the movement of coal blocks, prevent the grinding roller 40 from pushing larger coal blocks to move in the coal grinding concave surface and become difficult to grind, thereby improving the grinding effect.

[0039] (5) The hot air assembly 130 introduces hot air into the air chamber at the bottom of the casing 20. The hot air is ejected from the nozzle ring 320, blowing up the crushed fine coal powder and carrying it away while drying and heating the coal powder.

[0040] (6) The blown coal powder enters the separation assembly 140, where the fine coal powder is collected by the cyclone separation principle, and the coarse coal powder falls back to the grinding disc 30 for re-grinding.

[0041] In this way, a crushing assembly and a limit assembly are added to the coal mill, and the crushing rod 60 is caused to reciprocate between slow rise and rapid descent through the rotation of the grinding disc 30 to produce an impact on larger coal lumps, increase the crushing form, and limit the movement of larger coal lumps to improve the grinding effect. In combination with the grinding action of the grinding disc 30 and the grinding roller 40, larger coal lumps can be quickly crushed, the crushing process is optimized, and the crushing capacity and efficiency of the coal mill are improved.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A coal mill, characterized in that: The machine comprises a machine base, on which a grinding disc, a grinding roller and a loading frame are arranged, and the grinding roller is lifted and lowered along with the loading frame. The machine base is characterized in that a crushing assembly is arranged above the grinding disc, and the crushing assembly comprises: A crushing rod, wherein the crushing rod is vertically slidably connected to the loading frame, and when the crushing rod descends, it is used to crush the coal blocks on the grinding disc, and a first spring is provided between the crushing rod and the loading frame, so that the crushing rod has a tendency to descend and reset; A guide member, which is fixedly connected to the breaker bar and is used to control the vertical movement of the breaker bar; A guide ring, wherein the guide ring is fixedly connected to the grinding disc, the guide member is in active contact with the guide ring, and a plurality of guide teeth are arranged on the guide ring. When the guide ring rotates with the grinding disc, the guide teeth guide the guide member to move vertically, so as to realize the vertical movement of the crushing rod; the guide teeth include a guide inclined surface and a guide vertical surface. When the guide ring rotates with the grinding disc, the guide inclined surface is used to guide the guide member to rise, and the guide vertical surface is used to guide the guide member to descend; A limit assembly is provided at the coal grinding concave surface of the grinding disc, and the limit assembly includes a limit baffle and a second spring. The coal grinding concave surface of the grinding disc has a plurality of grooves for installing the limit baffle, and the upper surface of the limit baffle is in an arc-shaped curved surface that matches the coal grinding concave surface of the grinding disc. The second spring is connected between the limit baffle and the groove, and the second spring is used to apply an elastic force to the limit baffle so that the limit baffle protrudes from the coal grinding concave surface of the grinding disc to limit the movement of the coal block; The crushing assembly further comprises a sleeve rod, the sleeve rod is fixed to the lower bottom surface of the loading frame, the crushing rod is slidably sleeved in the sleeve rod, a head is provided at the top of the crushing rod for preventing the crushing rod from being separated from the sleeve rod, one end of the first spring is fixed to the head, and the other end of the first spring is fixed to the upper bottom surface of the loading frame; The sleeve rod is provided with a vertical groove, and the guide piece is slidably matched with the vertical groove; The diameter of the crushing rod is matched with the inner diameter of the sleeve rod. When the crushing rod rises, the bottom end of the crushing rod extends into the sleeve rod to clean the coal blocks attached to the crushing rod and make the coal blocks fall back onto the grinding disc.

2. A coal mill according to claim 1, characterized in that: The crushing assembly also includes a cap, which is sleeved outside the head.

3. A coal mill according to claim 1, characterized in that: The guide member comprises a guide ring and a guide rod, a plurality of the guide rods are fixedly connected to each other through the guide ring, and the guide rod is fixedly connected to the breaking rod.

4. A coal mill according to claim 1, characterized in that: The loading frame is provided with a roller bracket for mounting a grinding roller, and the roller bracket is provided with a scraper for cleaning the grinding roller, wherein the scraper has an arc groove matched with the outer peripheral side of the grinding roller.

5. A coal mill according to claim 1, characterized in that: A casing is also provided on the machine base, a nozzle ring is provided on the outer peripheral side of the grinding disc, a guide block is provided on the inner wall of the casing and is located above the nozzle ring, a material passing gap is provided between the guide block and the upper surface of the nozzle ring to allow the crushed coal powder to enter the nozzle ring, and the guide block is made of elastic material and has an arc-shaped surface to push the uncrushed coal blocks back to the coal grinding concave surface of the grinding disc when the grinding disc rotates.

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