Grinding and sorting equipment

Abstract

The utility model discloses grinding and sorting equipment, which relates to the technical field of cement production and comprises a roller press, a dry classification cabin and a ball mill, a discharge port of the roller press is communicated with a feed port of the dry classification cabin, a coarse material outlet of the dry classification cabin is communicated with and returns to the feed port of the roller press, and a fine material outlet of the dry classification cabin is communicated with a feed port of the ball mill; the dry type grading cabin comprises a scattering unit and a grading unit, the dry type grading cabin is adopted to replace an original two-stage powder selecting structure and matched with a circulating fan combination, equipment is reduced, and the equipment process is simplified; the particle size of a finished product material can be effectively controlled, and the finished product quality is improved; configuration power is low, and equipment energy consumption is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production, in particular to a grinding and sorting device. Background Art

[0002] Common cement grinding and sorting equipment uses a combination of roller press, V-type powder selector and dynamic powder selector to process materials. Its characteristic is that the V-type powder selector is used to sort the cake material squeezed out by the roller press, and the main power of the entire sorting equipment is provided by the circulating fan. The extruded cake is transported to the V-type powder selector by a bucket elevator to break up and classify the materials. The coarse particles are circulated back to the roller press for further extrusion, and the fine particles are transported to the dynamic powder selector by wind power. The quality of the fine powder is controlled by adjusting the rotor speed of the dynamic powder selector. The coarse particles sorted by the dynamic powder selector are circulated back to the roller press for extrusion, and the fine powder materials are collected by the cyclone separator and fed to the next-level ball mill equipment for grinding into cement products.

[0003] There are some defects in the existing cement grinding and sorting equipment. The quality of fine powder is controlled by adjusting the speed of the powder selector, and there is occasional coarseness. The V-type powder selector is matched with the secondary powder selection structure composed of the dynamic powder selector and the circulating fan combination. The equipment process is complicated, the configuration power is high, and the equipment energy consumption is high.

[0004] The existing grinding equipment should be optimized and improved to improve cement grinding efficiency and reduce production energy consumption. Utility Model Content

[0005] The purpose of the utility model is: to address the above-mentioned problems, the utility model provides a powder grinding and sorting equipment, which adopts a dry classification chamber to replace the original two-level powder selection structure with a circulating fan combination, thereby reducing equipment and simplifying equipment processes; it can effectively control the particle size of the finished material, eliminate the coarseness phenomenon, and improve the quality of the finished product; the configuration power is low, which effectively reduces the energy consumption of the equipment.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A grinding and sorting equipment comprises a roller press, a dry classifying chamber and a ball mill, wherein the discharge port of the roller press is connected to the feed port of the dry classifying chamber, the coarse material outlet of the dry classifying chamber is connected to and returns to the feed port of the roller press, and the fine material outlet is connected to the feed port of the ball mill; the dry classifying chamber comprises a breaking up unit and a classifying unit, the breaking up unit is provided with a breaking up screen plate which can break up and screen the materials, the classifying unit is provided with a classifying screen plate, the feed port of the dry classifying chamber is connected to the breaking up unit, the feed port of the classifying unit corresponds to the under-screen area of ​​the breaking up unit, the fine material outlet of the dry classifying chamber corresponds to the under-screen area connected to the classifying unit device, and the coarse material outlet of the dry classifying chamber corresponds to the over-screen area connected to the classifying unit device.

[0008] Furthermore, it also includes a weighing and stabilizing flow bin, the discharge port of which is connected to the feed port of the roller press, the feed port of which is connected to the incoming material conveying device and the coarse material outlet of the dry grading chamber, and a gate valve that can limit the material feeding is provided on the chute from the weighing and stabilizing flow bin to the roller press.

[0009] Furthermore, the incoming material conveying device includes a batching bin, a quantitative feeder, a belt conveyor and a three-way valve. The feed end of the quantitative feeder matches the batching bin, and the discharge end matches the feed end of the belt conveyor. The belt conveyor is provided with an iron remover and a metal detector. The iron remover is close to the feed end of the belt conveyor, and the metal detector is close to the discharge end of the belt conveyor. The three-way valve includes an inlet, a discharge port and a discharge port. The inlet of the three-way valve is connected to the discharge end of the belt conveyor, the discharge port is connected to the inlet of the weighing stabilizing bin, and the discharge port is connected to the external discharge area.

[0010] Furthermore, a solid flow meter is provided between the dry classification chamber and the ball mill.

[0011] Furthermore, a bucket elevator is provided between the roller press and the dry classification chamber.

[0012] Furthermore, it also includes a dust collector and an exhaust fan, wherein one side of the dust collector is connected to the dust generating point of the bucket elevator and / or the dry classification chamber, and the other side is connected to the exhaust fan.

[0013] Furthermore, the coarse material outlet of the dry classification chamber also corresponds to the above-screen area of ​​the breaking unit.

[0014] Furthermore, one end of the scattering screen plate is a fixed end, and the other end is a cantilever end that can generate inertial force when the excitation device drives the scattering screen plate to vibrate. The upper surface of the scattering screen plate is provided with a plurality of knocking structures that can act on the screened material and scatter the screened material under the drive of the inertial force of the cantilever end, and the knocking structures protrude from the surface of the scattering screen plate.

[0015] Furthermore, the cantilever end is a plurality of screen bars arranged side by side, one end of the screen bar is connected to the fixed end, and the other end is suspended in the air, and the gap between two adjacent screen bars is the screening area.

[0016] A grinding and sorting method comprises the following steps:

[0017] Rolling step: the material is fed into the roller press, squeezed by the roller press to form a cake, and then sent to the dry classification chamber;

[0018] Classification steps: the material cake first enters the breaking unit of the dry classification chamber, and is broken up by vibration in the breaking unit. The coarse particle material is discharged from the coarse material outlet. The remaining material enters the fine classification device as the primary screening material, and is graded and screened through the grading screen. The coarse particle material in the upper area of ​​the grading screen is discharged from the coarse material outlet and returned to the roller press. The fine particle material in the lower area of ​​the grading screen is discharged from the fine material outlet and fed into the ball mill.

[0019] Ball milling step: The fine-grained material fed into the ball mill is ground and then output as the finished product.

[0020] Furthermore, it also includes a feeding step: the raw ores of each component are discharged from the batching bin to the quantitative feeder, and are fed into the belt conveyor after being measured according to the required ratio. During the transportation of the material by the belt conveyor, the magnetic iron parts in the material are first removed by the iron remover, and then the non-magnetic iron parts in the material are detected by the metal detector. After the non-magnetic iron parts are detected by the metal detector, they are discharged through the discharge port of the three-way valve, and the remaining materials are fed into the weighing stabilizing flow bin through the discharge port of the three-way valve. The materials in the weighing stabilizing flow bin are filled and supersaturated and fed to the roller press.

[0021] Furthermore, in the feeding step, the roller press is started first, and then the gate valve on the chute from the weighing stabilizing bin to the roller press is opened to feed the material.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0023] 1. The utility model adopts a dry classification chamber to replace the original secondary powder selection structure with a circulating fan combination, which reduces equipment and simplifies the equipment process.

[0024] 2. The utility model can effectively control the particle size of finished materials, eliminate the coarseness phenomenon, and improve the quality of finished products.

[0025] 3. After using the dry classification chamber to optimize the equipment, the particle size of the ball mill is improved, the equipment production capacity is increased, and the power consumption of the equipment is reduced.

[0026] 4. The utility model has low configuration power, which effectively reduces the energy consumption of the equipment.

[0027] 5. The material cake after rolling in the utility model is broken up and then screened, and the screening efficiency is high.

[0028] 6. In this utility model, the gate valve can be opened to feed materials only after the roller press is started, so as to avoid the roller press starting with materials.

[0029] 7. The utility model can effectively remove magnetic iron parts and non-magnetic iron parts in the raw ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a structural schematic diagram of the utility model grinding and sorting equipment;

[0031] Figure 2 It is a structural schematic diagram of the dry-type classification cabin of the utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the utility model for breaking up the screen plate;

[0033] Figure 4 It is a structural schematic diagram of the knocking structure of the utility model.

[0034] Markings in the figure: 1- batching bin, 2- quantitative feeder, 3- belt conveyor, 4- iron remover, 5- metal detector, 6- three-way valve, 7- weighing steady flow bin, 8- gate valve, 9- roller press, 10- bucket elevator, 11- dry classification chamber, 12- solid flow meter, 13- ball mill, 14- air box pulse dust collector, 15- exhaust fan, 100- breaking up screen plate, 101- fixed end, 102- cantilever end, 103- screening area, 20- knocking structure, 30- grading screen plate, 60- grading unit, 120- breaking up unit, 130- vibration device. DETAILED DESCRIPTION

[0035] The utility model is described in detail below in conjunction with the accompanying drawings.

[0036] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0037] Example 1

[0038] A grinding and sorting equipment, such as Figure 1-3 As shown, it includes a roller press 9, a dry classifying chamber 11 and a ball mill 13, the discharge port of the roller press 9 is connected to the feed port of the dry classifying chamber 11, the coarse material outlet of the dry classifying chamber 11 is connected to and returns to the feed port of the roller press 9, and the fine material outlet is connected to the feed port of the ball mill 13; the dry classifying chamber 11 includes a dispersing unit 120 and a classification unit 60, the dispersing unit 120 is provided with a dispersing screen plate 100 that can disperse and screen the materials, the classification unit 60 is provided with a classification screen plate 30, the feed port of the dry classifying chamber 11 is connected to the dispersing unit 120, the feed port of the classification unit 60 corresponds to the under-screen area of ​​the dispersing unit 120, the fine material outlet of the dry classifying chamber 11 corresponds to the under-screen area connected to the classification unit 60 device, and the coarse material outlet of the dry classifying chamber 11 corresponds to the over-screen area connected to the classification unit 60 device.

[0039] It also includes a weighing and stabilizing flow bin 7, the discharge port of the weighing and stabilizing flow bin 7 is connected to the feed port of the roller press 9, the feed port of the weighing and stabilizing flow bin 7 is connected to the coarse material outlet of the incoming material conveying device and the dry grading chamber 11, and a gate valve 8 for limiting the material feeding is provided on the chute from the weighing and stabilizing flow bin 7 to the roller press 9. Preferably, the gate valve 8 is a pneumatic gate valve.

[0040] The incoming material conveying device includes a batching bin 1, a quantitative feeder 2, a belt conveyor 3 and a three-way valve 6. The feed end of the quantitative feeder 2 matches the batching bin 1, and the discharge end matches the feed end of the belt conveyor 3. The belt conveyor 3 is provided with an iron remover 4 and a metal detector 5. The iron remover 4 is close to the feed end of the belt conveyor 3, and the metal detector 5 is close to the discharge end of the belt conveyor 3. The three-way valve 6 includes an inlet, a discharge port and a discharge port. The inlet of the three-way valve 6 is connected to the discharge end of the belt conveyor 3, the discharge port is connected to the inlet of the weighing stabilizing bin 7, and the discharge port is connected to the external discharge area, that is, Figure 1 The outer iron removal parts shown. Preferably, the iron remover 4 is a suspended permanent magnetic iron remover. The three-way valve 6 is preferably a pneumatic three-way valve.

[0041] A solid flow meter 12 is provided between the dry classification chamber 11 and the ball mill 13 .

[0042] A bucket elevator 10 is provided between the roller press 9 and the dry classification chamber 11 .

[0043] It also includes a dust collector 14 and an exhaust fan 15. One side of the dust collector 14 is connected to the dust generating points of the bucket elevator 10 and the dry classification chamber 11, and the other side is connected to the exhaust fan 15. Preferably, the dust collector 14 is an air box pulse dust collector, which is used to collect dust from each dust generating point. The dust-containing gas is purified by the air box pulse dust collector and then discharged from the equipment by the exhaust fan 15.

[0044] The coarse material outlet of the dry classification chamber 11 also corresponds to the screen area of ​​the scattering unit 120. That is, the scattering unit 120 can first separate the coarse particles, allowing the coarse particles to return to the roller press 9 for cyclic extrusion, which can improve the working efficiency of the classification unit 60.

[0045] One end of the scattering screen plate 100 is a fixed end 101, and the other end is a cantilever end 102 that can generate inertial force when the excitation device 130 drives the scattering screen plate 100 to vibrate. The cantilever end 102 is a plurality of screen bars arranged side by side, one end of the screen bar is connected to the fixed end 101, and the other end is suspended in the air, and the gap between two adjacent screen bars is the screening area 103. The upper surface of the scattering screen plate 100 is arranged with a plurality of knocking structures 20 that can act on the screened material and scatter the screened material under the drive of the inertial force of the cantilever end 102, and the knocking structures 20 protrude from the surface of the scattering screen plate 100. The knocking structures 20 can be Figure 4The rod shape shown may also be a hammer shape or a cone shape, etc., which is not limited here.

[0046] Example 2

[0047] A grinding and sorting method comprises the following steps:

[0048] Rolling step: the material is fed into the roller press 9, extruded by the roller press 9 to form a cake, and then sent to the dry classification chamber 11;

[0049] Classification step: the material cake first enters the breaking unit 120 of the dry classification chamber 11, and is broken up by vibration in the breaking unit 120, and the coarse particle material is discharged from the coarse material outlet, and the remaining material enters the fine classification device as the primary screening material, and is graded and screened by the grading screen plate 30, and the coarse particle material in the sieve area of ​​the grading screen plate 30 is discharged from the coarse material outlet and returned to the roller press 9, and the fine particle material in the sieve area of ​​the grading screen plate 30 is discharged from the fine material outlet and fed into the ball mill 13;

[0050] Ball milling step: The fine-grained material fed into the ball mill 13 is ground by the ball mill 13 and then output as a finished product.

[0051] Feeding steps: the raw ores of each component are discharged from the batching bin 1 to the quantitative feeder 2, and are fed into the belt conveyor 3 after being measured according to the required ratio. During the transportation of the material by the belt conveyor 3, the magnetic iron parts in the material are first removed by the iron remover 4, and then the non-magnetic iron parts in the material are detected by the metal detector 5. After the non-magnetic iron parts are detected by the metal detector 5, they are discharged through the discharge port of the three-way valve 6, and the remaining materials are fed into the weighing stabilizing flow bin 7 through the discharge port of the three-way valve 6. The materials in the weighing stabilizing flow bin 7 are filled and supersaturated and fed to the roller press 9.

[0052] In the feeding step, the roller press 9 is started first, and then the gate valve 8 on the chute from the weighing stabilizing bin 7 to the roller press 9 is opened to feed the material. It is prevented that the roller press 9 starts with material.

[0053] Example 3

[0054] A cement project in Sichuan produces PO 42.5 cement. After each component of the raw material is measured by the batching equipment through the quantitative feeder 2 according to the cement ratio requirements, it is transported to the weighing and stabilizing bin 7 by the belt conveyor 3. A suspended permanent magnetic iron remover is set on the belt conveyor 3 to remove magnetic iron parts in the material to protect the roller surface of the roller press 9 in the equipment from being damaged by iron parts. Then the material is fed into the weighing and stabilizing bin 7 by the belt conveyor 3. The material in the weighing and stabilizing bin 7 is supersaturated and fed to the roller press 9 when it is full. The material is squeezed by the roller press 9 to form a cake, which is transported to the inlet of the dry grading chamber 11 by the bucket elevator 10. According to different particle size requirements, the sieve hole diameters of the scattering screen plate 100 and the grading screen plate 30 are set. The materials are vibrated and scattered in the scattering unit 120, and enter the grading unit 60 in a dispersed state. The grading screen plate 30 is used for particle size classification and screening. The coarse-grained materials on the sieve are returned to the weighing stabilizing bin 7 and fed to the roller press 9 for cyclic extrusion. The fine-grained materials under the sieve are measured by the solid flow meter 12 and fed to the subsequent ball mill 13 for grinding. The original ball mill 13 equipment is reused.

[0055] Before optimization, the original equipment had a production capacity of about 100t / h and a power consumption of 32kWh / t. After optimization, the equipment had a production capacity of 110-115t / h and a power consumption of 29.5kWh / t. After optimization, the equipment production capacity increased by 10-15t / h and the power consumption of the equipment decreased by about 2.5kWh / t.

[0056] After this project adopted the dry classification chamber 11 to optimize the equipment, the particle size entering the mill was improved, the equipment production capacity was increased, and the power consumption of the equipment was reduced.

[0057] The principles and implementation methods of the present invention are described in this article using specific embodiments. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0058] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0059] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A grinding and sorting equipment, characterized in that: It includes a roller press, a dry classifying chamber and a ball mill, wherein the discharge port of the roller press is connected to the feed port of the dry classifying chamber, the coarse material outlet of the dry classifying chamber is connected to and returns to the feed port of the roller press, and the fine material outlet is connected to the feed port of the ball mill; the dry classifying chamber includes a dispersing unit and a classifying unit, the dispersing unit is provided with a dispersing screen plate which can disperse and screen the materials, the classifying unit is provided with a classifying screen plate, the feed port of the dry classifying chamber is connected to the dispersing unit, the feed port of the classifying unit corresponds to the under-screen area of ​​the dispersing unit, the fine material outlet of the dry classifying chamber corresponds to the under-screen area connected to the classifying unit device, and the coarse material outlet of the dry classifying chamber corresponds to the over-screen area connected to the classifying unit device.

2. The grinding and sorting equipment according to claim 1, characterized in that: It also includes a weighing and stabilizing flow bin, the discharge port of which is connected to the feed port of the roller press, and the feed port of which is connected to the coarse material outlet of the incoming material conveying device and the dry grading chamber.

3. The grinding and sorting equipment according to claim 2, characterized in that: The incoming material conveying device includes a batching bin, a quantitative feeder, a belt conveyor and a three-way valve. The feed end of the quantitative feeder matches the batching bin, and the discharge end matches the feed end of the belt conveyor. The belt conveyor is provided with an iron remover and a metal detector. The iron remover is close to the feed end of the belt conveyor, and the metal detector is close to the discharge end of the belt conveyor. The three-way valve includes an inlet, a discharge port and a discharge port. The inlet of the three-way valve is connected to the discharge end of the belt conveyor, the discharge port is connected to the inlet of the weighing stabilizing bin, and the discharge port is connected to the external discharge area.

4. The grinding and sorting equipment according to claim 1, characterized in that: A solid flow meter is provided between the dry classification chamber and the ball mill.

5. The grinding and sorting equipment according to claim 1, characterized in that: A bucket elevator is arranged between the roller press and the dry classification chamber.

6. The grinding and sorting equipment according to claim 5, characterized in that: It also includes a dust collector and an exhaust fan. One side of the dust collector is connected to the dust generating point of the bucket elevator and / or the dry classification chamber, and the other side is connected to the exhaust fan.

7. The grinding and sorting equipment according to claim 1, characterized in that: The coarse material outlet of the dry classification chamber also corresponds to the upper screen area of ​​the breaking unit.

8. The grinding and sorting equipment according to claim 1, characterized in that: One end of the scattering screen plate is a fixed end, and the other end is a cantilever end which can generate inertial force when the excitation device drives the scattering screen plate to vibrate; a plurality of knocking structures are arranged on the upper surface of the scattering screen plate which can act on the screened material and scatter the screened material under the drive of the inertial force of the cantilever end, and the knocking structures protrude from the surface of the scattering screen plate.

9. The grinding and sorting equipment according to claim 8, characterized in that: The cantilever end is a plurality of screen bars arranged side by side, one end of the screen bar is connected to the fixed end, and the other end is suspended in the air, and the gap between two adjacent screen bars is the screening area.

10. The grinding and sorting equipment according to claim 2, characterized in that: The slide pipe from the weighing stabilizing flow bin to the roller press is provided with a gate valve which can limit the feeding of materials.

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