Cement raw material combined powder concentrator with back-grinding function

Abstract

The utility model relates to the technical field of cement production, and discloses a cement raw material combined powder concentrator with a back-grinding function, which comprises a support frame, a power main body and an external machine body, the power main body and the external machine body are arranged at the upper end of the support frame, a material guide main body is arranged at the upper end of the external machine body, and a material guide pipe is fixedly connected to the upper end of the material guide main body. The material guiding pipe is used for being in butt joint with a mill outlet air pipeline of a mill, a feeding hopper assembly is arranged at the lower end of the material guiding body, the output end of the power body is connected with a rotor body, the rotor body extends into an external machine body, and the coarse powder material guiding channel is designed in an inclined mode, assists smooth feeding of coarse powder and avoids blocking. Coarse powder is continuously and uniformly conveyed to an inlet of a fine grinding bin of the grinding machine through rotation of the internal spiral blade, automatic return grinding of the coarse powder is achieved, and manual intervention is not needed in the whole process.

Description

TECHNICAL FIELD

[0001] The utility model relates to cement production technical field especially relates to a cement raw material combined type powder concentrator with back grinding function. BACKGROUND

[0002] In the new dry process cement production process, the raw material preparation link is the core process of guaranteeing the subsequent clinker calcination efficiency and cement product quality, and its core target is to grind a plurality of raw materials according to the proportioning to the required fineness and improve the raw material utilization rate through circulation processing. This link usually covers key steps such as raw material proportioning, grinding, classification, and circulating grinding, among which, the synergistic effect of grinding and classification directly determines the overall efficiency and energy consumption level of raw material preparation. When preparing raw materials, first, the basic raw materials such as limestone, clay, and iron powder are mixed with industrial solid wastes such as carbide slag and kiln dust according to the preset proportion to form mixed raw materials, which are then sent into a tube mill or a vertical mill for grinding treatment. Due to the differences in hardness and particle size of the raw materials, not all of them can reach the qualified fineness after one grinding, so a powder selection device is needed to classify the ground materials, and a closed-loop process of "grinding-classification-grinding" is constructed. The materials ground by the mill are directly sent into the combined type powder concentrator through the mill outlet air pipe. However, the existing combined type powder concentrator does not design a special grinding channel for the interface of the mill fine grinding bin, and the classified coarse powder can only fall into the collecting hopper or the storage bin for temporary storage, which needs to be manually controlled and transported to the mill inlet for refeeding. This not only completely interrupts the continuous process of raw material preparation, but also greatly prolongs the cement production cycle, resulting in low efficiency. SUMMARY

[0003] The technical problem to be solved by the utility model is that the classified coarse powder can only fall into the collecting hopper or the storage bin for temporary storage, and the subsequent manual control and transportation to the mill inlet for refeeding. To solve this problem, the utility model provides a cement raw material combined type powder concentrator with back grinding function.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a cement raw material combined type powder concentrator with back grinding function, comprising a support frame, a power main body and an external machine body installed on the upper end of the support frame, a material guiding main body is installed on the upper end of the external machine body, a material guiding pipe is fixedly connected to the upper end of the material guiding main body, the material guiding pipe is used to connect the mill outlet air pipe, a feeding hopper assembly is arranged at the lower end of the material guiding main body, a rotor main body is connected to the output end of the power main body, the rotor main body extends into the internal part of the external machine body, a stable horizontal vortex is formed by high-speed rotation of the rotor main body to realize gravity settling and vortex classification synergistic powder selection, a fine powder collecting channel is arranged at the position corresponding to the inner side of the rotor main body at the upper part of the cavity of the external machine body, a coarse powder material guiding channel is arranged at the bottom of the cavity of the external machine body, and a spiral conveying pipe is connected to one end of the coarse powder material guiding channel.

[0005] Further, the feeding hopper assembly comprises a hopper body arranged at the lower end of the material guiding body, one end of the hopper body extends to the inside of the outer machine body, a through opening is arranged at the end of the hopper body extending to the inside of the outer machine body, an upper mounting block is fixedly arranged at the top of the cavity of the through opening, a sliding groove body is arranged on the lower wall of the upper mounting block, a sliding block body is slidably connected to the inner wall of the sliding groove body, a partition plate body is fixedly connected to the lower end of the sliding block body, and an elastic force assembly is arranged on one side of the sliding block body.

[0006] Further, the lower wall of the through opening is inclined, and the partition plate body is used for sealing the through opening.

[0007] Further, the elastic force assembly comprises a movable column fixedly connected to the sliding block body, and a movable cavity arranged in the inner wall of the sliding groove body, a movable block is slidably connected to the inner wall of the movable cavity, the movable block is fixedly connected to the movable column, and a supporting spring is sleeved with the outer wall of the movable column.

[0008] Further, one end of the supporting spring is fixedly connected to the sliding block body, and the other end of the supporting spring is fixedly connected to the inner wall of the sliding groove body.

[0009] Further, in the compressed state of the supporting spring, the partition plate body protrudes from the through opening.

[0010] Technical effects and advantages of the present application:

[0011] In the present application, the coarse powder in the coarse powder material guiding channel is slowly introduced into the spiral conveying pipe under the action of its own gravity, so that the gravity of the coarse powder forms a downward component force along the axis of the channel, which assists the smooth feeding of the coarse powder and avoids blockage. After the spiral conveying pipe is started, the coarse powder moves forward along the spiral chamber under the action of the thrust force, and finally the coarse powder is continuously and uniformly conveyed to the inlet of the fine grinding bin of the mill, realizing the automatic regrinding of the coarse powder. The whole process does not need manual intervention, solves the problem that the existing combined powder separator is not designed with a special regrinding channel for the docking of the fine grinding bin of the mill, and the separated coarse powder can only fall into the collecting hopper or the storage bin for temporary storage, and then needs to be manually controlled to be transported to the mill inlet for refeeding, which completely interrupts the continuous process of raw material preparation, greatly prolongs the cement production cycle, and has the problem of low efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] The disclosure of the present application will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference numerals are used to refer to the same parts:

[0013] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application;

[0014] Figure 2 Figure 2 is a schematic view of the overall structure of the utility model from another perspective;

[0015] Figure 3 Figure 1 is a schematic view of the overall plan structure of the utility model;

[0016] Figure 4 Figure 4 is a schematic view of the feed hopper assembly structure of the utility model;

[0017] Figure 5 Figure 5 is a schematic view of the Figure 4 enlarged structure of A of the utility model.

[0018] Legend: 1, support frame; 2, power main body; 3, outer machine body; 4, material guiding main body; 5, material guiding pipe; 6, feed hopper assembly; 61, hopper main body; 62, through opening; 63, partition main body; 64, upper mounting block; 65, chute main body; 66, sliding block main body; 67, elastic assembly; 671, movable column; 672, movable cavity; 673, movable block; 674, supporting spring; 7, rotor main body; 8, coarse powder material guiding passage; 9, spiral conveying pipe; 10, fine powder collecting passage. DETAILED DESCRIPTION

[0019] It is easy to understand that according to the technical scheme of the utility model, a person skilled in the art can propose a plurality of structure modes and implementation modes that can be replaced with each other without changing the essential spirit of the utility model. Therefore, the following detailed description and the drawings are only exemplary descriptions of the technical scheme of the utility model, and should not be regarded as the whole or regarded as the limitation or restriction of the technical scheme of the utility model.

[0020] Referring to Figures 1-5 Figure 4, in order to solve the problem that the existing combined powder selecting machine is not designed with a special return grinding passage for docking with the fine grinding bin of the mill, the coarse powder after sorting can only fall into the collecting hopper or the storage bin for temporary storage, and the coarse powder needs to be manually controlled to be re-transported to the mill feed inlet for re-feeding, which not only completely interrupts the continuous process of raw material preparation, greatly prolongs the cement production cycle, and has the problem of low efficiency, the following preferred technical scheme is provided:

[0021] The cement raw material combined powder concentrator with a back-grinding function comprises a support frame 1, a power main body 2 and an outer machine body 3 installed on the upper end of the support frame 1, the outer machine body 3 provides a closed cavity for powder selection, coarse powder temporary storage and fine powder separation and export, the upper end of the outer machine body 3 is provided with a material guiding main body 4, the upper end of the material guiding main body 4 is fixedly connected with a material guiding pipe 5 used for connecting with the mill outlet air pipe, the lower end of the material guiding main body 4 is provided with a feeding hopper assembly 6 for realizing the unified collection and stable flow feeding of the mill separated materials, the output end of the power main body 2 is connected with a rotor main body 7 extending into the inside of the outer machine body 3, the stable horizontal vortex is formed by the high-speed rotation of the rotor main body 7, the coarse and fine powder is accurately separated by the synergistic effect of gravity settling and vortex classification, the fine powder meeting the fineness standard is carried into the inside of the rotor main body 7 by the vortex, the fine powder collecting channel 10 is arranged at the position corresponding to the inside of the rotor main body 7 at the upper part of the cavity of the outer machine body 3, the fine powder is guided out through the channel and then collected into the dust collection and storage device, finally, the fine powder is sent into the homogenizing library for standby, the efficient collection and storage of the fine powder are completed, the coarse powder guiding channel 8 is arranged at the bottom of the cavity of the outer machine body 3 for temporarily storing the classified coarse powder and avoiding the coarse powder accumulation affecting the powder selection efficiency, the coarse powder guiding channel 8 is designed to be inclined, the one end of the coarse powder guiding channel 8 is communicated with a spiral conveying pipe 9, the automatic and continuous conveying of the coarse powder to the mill fine grinding bin is realized through the spiral conveying pipe 9, the manual transfer is completely replaced, the production process closed loop is ensured to be coherent, and the production efficiency is greatly improved.

[0022] The feeding hopper assembly 6 comprises a hopper main body 61 arranged at the lower end of the material guiding main body 4, one end of the hopper main body 61 extends into the inside of the outer machine body 3 for stably guiding the collected materials into the outer machine body 3 and avoiding the feeding impact to damage the vortex stability, the one end of the hopper main body 61 extending into the inside of the outer machine body 3 is provided with a through port 62, the upper end of the cavity of the through port 62 is fixedly installed with an upper mounting block 64, the lower wall of the upper mounting block 64 is provided with a sliding groove main body 65, the sliding groove main body 65 provides a guiding sliding track for a sliding block main body 66 to ensure the accurate movement of a partition plate main body 63, the lower end of the sliding block main body 66 is fixedly connected with the partition plate main body 63, one side of the sliding block main body 66 is provided with an elastic component 67, the lower wall of the through port 62 is inclined, the gravity is used to assist the material sliding and prevent the material from being accumulated at the through port 62, the partition plate main body 63 is used for sealing the through port 62 to realize the self-adaptive adjustment of the feeding amount and avoid the sudden increase of the powder selection load caused by excessive feeding.

[0023] The elastic assembly 67 comprises a movable column 671 fixedly connected with the sliding block body 66 at one end, and a movable cavity 672 formed in the inner wall of the sliding groove body 65, the inner wall of the movable cavity 672 being slidably connected with a movable block 673, the movable block 673 being fixedly connected with the movable column 671, so as to enhance the stability of the sliding block body 66 when sliding and avoid deviation and jamming, the outer wall of the movable column 671 being sleeved with a supporting spring 674, one end of the supporting spring 674 being fixedly connected with the sliding block body 66, and the other end of the supporting spring 674 being fixedly connected with the inner wall of the sliding groove body 65, the baffle body 63 protruding from the through opening 62 in the compressed state of the supporting spring 674, at this time the through opening 62 is in an open state; when the material in the hopper body 61 accumulates to a certain weight, the material gravity presses the baffle body 63, drives the sliding block body 66 to compress the supporting spring 674 and slide along the sliding groove body 65, so that the baffle body 63 moves outward until it protrudes from the through opening 62, the through opening 62 is opened for feeding, and after the material is reduced, the supporting spring 674 resets to drive the baffle body 63 to seal the through opening 62 again, so that the dynamic balance of the feeding amount is realized through the self-adaptive adjustment of the elastic force, the airflow stability in the powder classifier is ensured, and the classification precision is improved.

[0024] Specifically, in the feeding stage, the hopper body 61 bears the functions of temporary storage and flow guiding, the structure extending into the inside of the outer machine body 3 can shorten the distance of material into the cavity, reduce the feeding impact, the inclined design of the lower wall of the through opening 62 can assist the smooth sliding of the material by gravity, at the same time, the elastic assembly 67 and the baffle body 63 form a self-adaptive feeding adjustment mechanism, the supporting spring 674 is in a relaxed state under normal circumstances, so as to realize the sealing of the through opening 62 and prevent the airflow in the outer machine body 3 from leaking out to affect the stability of the vortex, when the material in the hopper body 61 accumulates to a set weight, the material gravity vertically presses the baffle body 63, the driving force is transmitted to the sliding block body 66, so that it smoothly slides along the sliding groove body 65, at the same time, the supporting spring 674 is compressed, driving the baffle body 63 to move outward, the through opening 62 is opened for feeding, as the material falls, the weight gradually decreases, the supporting spring 674 elastically resets to push the sliding block body 66 to slide reversely, and the baffle body 63 seals the through opening 62 again, the process is repeated to realize the dynamic balance of the feeding amount, and ensure that the material entering the outer machine body 3 is uniform and stable, laying a foundation for accurate classification.

[0025] In the sorting stage, the power main body 2 starts to drive the rotor main body 7 to rotate at high speed inside the outer machine body 3 around the central axis. The blades of the rotor main body 7 form an annular air flow channel with the inner wall of the outer machine body 3. When the blades rotate, they generate a tangential thrust on the air in the cavity, causing the air to move in a spiral along the blade profile, forming a stable horizontal vortex field with high flow velocity on the outside and low flow velocity on the inside. Moreover, a negative pressure area is formed on the inside of the rotor main body 7 due to the air flow distribution characteristics. When the material enters the vortex field through the feed hopper assembly 6, it is separated into coarse and fine powders under the synergistic action of gravity and vortex centrifugal force. The fine powder particles that meet the fineness standard are light in mass and small in inertia, and the carrying force of the vortex air flow is greater than their centrifugal force, so they cannot break through the adsorption of the negative pressure area on the inside and are continuously carried by the vortex to the air flow channel on the inside of the rotor main body 7. The outer machine body 3 has a ring-shaped fine powder collection channel 10 extending along the inner wall on the inside of the rotor main body 7, and the inside opening of the channel is aligned with the air flow channel on the inside of the rotor main body 7. The fine powder flows naturally into the collection channel with the air flow, and the channel outlet is connected to a dust collection and storage device, so that the fine powder is accurately guided out of the channel and then flows into the dust collection and storage device, providing qualified raw materials for the subsequent clinker calcination process. The coarse powder particles that do not meet the standard are heavy in mass and large in inertia, and their centrifugal force is greater than the carrying force of the air flow. Under the action of inertia, they are thrown to the inner wall of the outer machine body 3, leaving the vortex core area, and then gradually settle under the action of gravity, finally falling into the coarse powder guide channel 8 at the bottom of the cavity of the outer machine body 3.

[0026] In the coarse powder back-milling stage, the coarse powder guide channel 8 is designed to be inclined, and the coarse powder in the coarse powder guide channel 8 is slowly guided into the spiral conveying pipe 9 by gravity, so that the gravity of the coarse powder forms a downward component force along the channel axis, which helps the smooth feeding of the coarse powder and avoids blockage. After the spiral conveying pipe 9 is started, the continuous and uninterrupted spiral blades in the spiral conveying pipe 9 form a closed spiral chamber with the inner wall of the pipe. When the blades rotate, the spiral slope of the blades produces contact and extrusion with the coarse powder particles, and applies a pushing force along the axis of the pipe. At the same time, the inner wall of the spiral conveying pipe 9 limits the rotation of the coarse powder with the blades, so that the coarse powder moves forward along the spiral chamber under the action of the pushing force. At the same time, the connecting port of the coarse powder guide channel 8 is located at the upper part of the spiral conveying pipe 9, and the coarse powder continuously falls into the spiral chamber under the action of gravity, cooperates with the pushing force of the blades, and the axis of the spiral conveying pipe 9 is adapted to the inclination angle of the coarse powder guide channel 8, so that the component force of the gravity of the coarse powder along the axis of the pipe is consistent with the direction of the pushing force of the blades, which further improves the uniformity of conveying, avoids the accumulation or flow fluctuation of the coarse powder, and realizes the automatic back-milling of the coarse powder. The mill is connected with hot air in the grinding process, the airflow rises in the mill and mixes with the material to form a wind-material mixture, which is introduced through the mill's built-in mill air pipe, and then enters the powder separator again through the guide pipe 5 connected with the mill air pipe, realizes the circulation and separation of the coarse powder, and thus forms a complete closed loop process of powder selection, back-milling and re-selection. The whole process does not need manual intervention, solves the problem that the existing combined powder separator does not design a special back-milling channel connected with the fine grinding bin of the mill, and the separated coarse powder can only fall into the collecting hopper or the storage bin for temporary storage, and then needs to be manually transferred to the mill inlet for re-feeding, which completely interrupts the continuous process of raw material preparation, greatly prolongs the cement production cycle, and has the problem of low efficiency.

[0027] The technical scope of the utility model is not limited to the content in the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical thought of the utility model, and these modifications and changes should all belong to the protection scope of the utility model.

Claims

1. A cement raw meal combined classifier with a back-grinding function, characterized in that, Including support frame, and install in the power main body with outer body on the support frame upper end, the upper end of the outer body is installed with the material guide main body, the upper end of the material guide main body is fixedly connected with the material guide pipe, the material guide pipe is used to butt joint mill outlet wind pipe, the lower end of the material guide main body is provided with the feed hopper assembly, the output end of the power main body is connected with the rotor main body, the rotor main body extends to the inside of the outer body, forms stable horizontal vortex by high-speed rotation to drive the airflow in the outer body, realizes gravity settling and vortex classification collaborative selection of powder, the upper part of the cavity in the outer body is provided with fine powder collection channel corresponding to the inside position of the rotor main body, the bottom of the cavity in the outer body is provided with coarse powder material guide channel, one end of the coarse powder material guide channel is communicated with the spiral conveying pipe; The feed hopper assembly includes a hopper body disposed at the lower end of the material guide main body, one end of the hopper body extends into the interior of the outer body, and a through opening is formed at one end of the hopper body extending into the interior of the outer body, an upper mounting block is fixedly installed at the top of the cavity of the through opening, a sliding groove main body is formed in the lower wall of the upper mounting block, a sliding block main body is slidably connected to the inner wall of the sliding groove main body, a partition plate main body is fixedly connected to the lower end of the sliding block main body, and an elastic assembly is arranged on one side of the sliding block main body. The elastic assembly includes a movable column fixedly connected to one end of the sliding block main body, and a movable cavity formed in the inner wall of the sliding groove main body, and a movable block is slidably connected to the inner wall of the movable cavity, the movable block is fixedly connected to the movable column, and a supporting spring is sleeved on the outer wall of the movable column.

2. A cement raw meal combination classifier with a back-grinding function according to claim 1, characterized in that: The lower wall of the through opening is inclined, and the partition plate main body is used to seal the through opening.

3. A cement raw meal combined classifier with a back-grinding function according to claim 1, characterized in that: One end of the supporting spring is fixedly connected to the sliding block main body, and the other end of the supporting spring is fixedly connected to the inner wall of the sliding groove main body.

4. A cement raw meal combination classifier with a back-grinding function according to claim 3, characterized in that: When the supporting spring is compressed, the partition plate main body protrudes from the through opening.

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