Papermaking white mud drying and grinding device

Abstract

The utility model discloses a papermaking white mud drying and grinding device which comprises a shell and a feeding pipe arranged at the top of the shell, the interior of the shell is sequentially divided into a dewatering chamber and a dry grinding chamber from top to bottom through a partition plate, a water throwing barrel capable of rotating at a high speed is concentrically arranged on the upper portion in the dewatering chamber, and an inverted-Y-shaped material distributing pipe is arranged below the water throwing barrel. Packing auger mechanisms are respectively arranged in two branch pipes at the lower part of the material distribution pipe, a plurality of water outlet holes are formed in the side walls of the water throwing cylinder and the branch pipes, a water drainage pipe is arranged at the bottom of the dewatering chamber, two drying cylinders are respectively obliquely arranged at the upper part in the dry grinding chamber, stirring mechanisms are arranged in the drying cylinders, and an annular upper mill is fixed on the shell below the drying cylinders; a lower mill capable of rotating at a high speed is arranged below the upper mill; and heating elements are respectively arranged in the upper mill and on the drying cylinder. In conclusion, the grinding machine has the advantages of high working efficiency, good grinding effect and capability of improving the product quality.

Description

Technical Field

[0001] This utility model relates to the field of white clay grinding technology, specifically to a papermaking white clay drying and grinding device. Background Technology

[0002] Paper mill sludge refers to waste generated during the papermaking process. One ton of sludge is produced for every ton of pulp manufactured. It consists of impurities, fiber residues, and sediments from the pulp. Although sludge is a waste product, it is widely used for soil improvement due to its rich organic matter and trace elements. This improves soil fertility, structure, and permeability, increases water retention, and enhances crop yield and quality. Paper mill sludge can also be used in desulfurizing agents and building materials. However, before being used for soil improvement or as a desulfurizing agent, paper mill sludge needs to be ground into powder.

[0003] Currently, the following problems exist when using grinding equipment to process papermaking sludge: First, the grinding efficiency is low, and the sludge particles are uneven after grinding, failing to meet the grinding requirements; second, the moisture content of papermaking sludge is generally between 40% and 60%, while existing grinding equipment often lacks a drying function, which is not conducive to grinding and results in the sludge still containing some moisture after grinding, affecting the quality of the sludge powder. Although some companies have dried the sludge during grinding, the drying effect is unsatisfactory. Therefore, it is objectively necessary to develop a papermaking sludge drying and grinding equipment with high working efficiency, good grinding effect, and improved product quality. Utility Model Content

[0004] The purpose of this invention is to provide a papermaking white mud drying and grinding device with high working efficiency, good grinding effect, and improved product quality.

[0005] The purpose of this utility model is achieved as follows: It includes a housing and a feed pipe located at the top of the housing. The interior of the housing is divided into a dehydration chamber and a dry grinding chamber from top to bottom by a partition. A high-speed rotating water-throwing cylinder is concentrically arranged in the upper part of the dehydration chamber. The lower end of the feed pipe is located above the water-throwing cylinder. A Y-shaped distribution pipe is arranged below the water-throwing cylinder. Two branch pipes at the bottom of the distribution pipe are each equipped with an auger mechanism, and the lower ends of the branch pipes are fixedly connected to the housing. Several water outlet holes are machined on the side walls of both the water-throwing cylinder and the branch pipes. A drain pipe is arranged at the bottom of the dehydration chamber. Two drying cylinders are inclinedly arranged in the upper part of the dry grinding chamber. The higher end of the drying cylinder is fixed to the housing, and the lower end is suspended. The bottom of each of the two branch pipes is connected to the corresponding higher end of the drying cylinder through a guide pipe. A stirring mechanism is arranged inside the drying cylinder. An annular upper mill is fixed on the housing below the drying cylinder. A high-speed rotating lower mill is arranged below the upper mill. Heating elements are arranged inside the upper mill and on the drying cylinder.

[0006] Furthermore, the upper part of the dry grinding chamber is connected to the dehydration chamber via an upper air pipe.

[0007] Furthermore, a motor is installed at the bottom of the housing, and the output shaft of the motor is connected to the center of the lower mill via a vertical shaft. A scraper is installed on the vertical shaft below the lower mill, and the lower side of the scraper contacts the bottom of the housing.

[0008] Furthermore, a flushing pipe is vertically installed in the dehydration chamber outside the water-spinning cylinder, and a water spray nozzle is installed on the flushing pipe facing the direction of the water-spinning cylinder.

[0009] Furthermore, a discharge pipe is installed at the bottom of the water-spinning cylinder, and a support frame is installed in the dewatering chamber. The support frame and the discharge pipe are rotatably connected by bearings.

[0010] Furthermore, a material-gathering cone with a large opening facing upwards and a small opening facing downwards is installed in the dry grinding chamber above the upper mill.

[0011] Furthermore, the gap between the upper and lower grinding surfaces gradually decreases from top to bottom.

[0012] Furthermore, nylon filter cloth is installed on the inner walls of the water-spinning cylinder and the distribution pipe.

[0013] In operation, the papermaking sludge is fed into the dewatering chamber through the feed pipe. During high-speed rotation, centrifugal force causes some water to be ejected from the sludge. The remaining sludge falls from the bottom of the feed pipe into the distribution pipe, where it is divided into two streams that enter two separate pipes. The auger mechanism is then activated, causing the sludge to move downwards and be squeezed to remove water. After two dewatering cycles, most of the water is removed. The sludge then falls into the drying cylinder through the guide pipe. Because the drying cylinder is tilted, the sludge moves downwards under its own weight. During this movement, the stirring mechanism disperses the sludge and promotes rapid drying. When the sludge exits the drying cylinder, the drying process is essentially complete. It then falls between the upper and lower mills for grinding, resulting in uniformly sized sludge particles. During the grinding process, the heating element in the upper mill continues to heat and dry the sludge, thus obtaining dried sludge. In this invention, centrifugal dehydration and extrusion dehydration are used to dehydrate the white clay. After two dehydration processes, the water content is largely removed. Following two heating and drying processes, relatively dry white clay is obtained, resulting in good drying performance, which facilitates powder processing and improves the quality of the white clay powder. Secondly, this invention uses a grinding method to pulverize the white clay, and thorough dehydration is performed before grinding. This improves both grinding efficiency and grinding effect, resulting in white clay with uniform particles that meet the grinding requirements, improve product quality, and satisfy the requirements for subsequent white clay reuse. Furthermore, the entire process of dehydration, drying, and grinding can be automated, requiring minimal manual intervention and exhibiting high work efficiency. In summary, this invention has the advantages of high work efficiency, good grinding effect, and improved product quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] In the diagram: 1-shell, 2-dehydration chamber, 3-dry grinding chamber, 4-water-spinning cylinder, 5-distribution pipe, 6-distribution pipe, 7-auger mechanism, 8-drying cylinder, 9-stirring mechanism, 10-upper mill, 11-lower mill, 12-heating element, 13-upper air pipe, 14-motor, 15-scraper, 16-rinsing pipe, 17-support frame, 18-gathering cone, 19-nylon filter cloth. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0017] like Figure 1 As shown, this utility model includes a shell 1 and a feed pipe disposed on the top of the shell 1. The interior of the shell 1 is divided into a dewatering chamber 2 and a dry grinding chamber 3 from top to bottom by a partition. The papermaking sludge undergoes dewatering treatment in the dewatering chamber 2 and drying and grinding treatment in the dry grinding chamber 3. A high-speed rotating water-spinning cylinder 4 is concentrically arranged in the upper part of the dewatering chamber 2. The water-spinning cylinder 4 can rotate at high speed. Its structure is existing technology. The water-spinning cylinder 4 can be driven to rotate by a geared motor. A gate valve is set at its bottom. The gate valve is closed when the sludge is dewatered. When the internal sludge dewatering is completed... After processing, the gate valve is opened, and the white mud falls and is discharged by itself. The lower end of the feed pipe is located above the water-throwing cylinder 4. Below the water-throwing cylinder 4, there is an inverted Y-shaped distribution pipe 5. The two branch pipes 6 at the bottom of the distribution pipe 5 are respectively equipped with auger mechanisms 7. The auger mechanism 7 is existing technology, that is, a rotating shaft is set in the branch pipe 6, and a spiral blade is set on the rotating shaft. The spiral blade is used to drive the white mud downward and squeeze the white mud. The lower end of the branch pipe 6 is fixedly connected to the shell 1. Several water outlet holes are machined on the side walls of the water-throwing cylinder 4 and the branch pipe 6. Moisture in the white mud inside pipe 6 is discharged through the water outlet. A drain pipe is installed at the bottom of dewatering chamber 2, through which moisture in dewatering chamber 2 is discharged. Two drying cylinders 8 are inclinedly installed in the upper part of the dry grinding chamber 3. The higher end of the drying cylinder 8 is fixed to the shell 1, and the lower end is suspended. To prevent white mud falling from the previous drying cylinder 8 from falling onto the next drying cylinder 8, the suspended ends of the two drying cylinders 8 are staggered. The bottoms of the two branch pipes 6 are respectively connected to the higher end of the corresponding drying cylinder 8 through a guide pipe. An agitation mechanism 9 is installed inside the drying cylinder 8. 9 is existing technology, which can achieve the stirring of white mud in the drying cylinder 8. The white mud is dispersed by stirring, which improves the drying efficiency. This can be achieved by using a rotating shaft and a stirring rod. The rotating shaft drives the stirring rod to rotate, continuously stirring the white mud. An annular upper mill 10 is fixed on the shell 1 below the drying cylinder 8. A high-speed rotating lower mill 11 is set below the upper mill 10. Heating elements 12 are respectively set in the upper mill 10 and on the drying cylinder 8. The heating element 12 is existing technology and is generally a resistance heating structure. It emits heat to heat and dry the white mud.

[0018] In operation, the papermaking sludge is fed into the dewatering chamber 2 through the feed pipe into the centrifugal drum 4. During high-speed rotation, centrifugal force causes some water to be ejected from the sludge. The remaining sludge falls from the bottom of the centrifugal drum 4 into the distribution pipe 5. After distribution, it splits into two streams, which enter two separate pipes 6. The auger mechanism 7 is then activated, causing the sludge to move downwards and be squeezed to remove water. After two dewatering processes, most of the water in the sludge is removed. The white clay falls into the drying cylinder 8 through the feed pipe. Since the drying cylinder 8 is set at an inclination, the white clay moves downwards in the drying cylinder 8 by its own gravity. During the movement, the stirring mechanism 9 stirs the white clay and promotes the rapid drying of the white clay. When the white clay is discharged from the drying cylinder 8, the drying process is basically completed. It falls between the upper mill 10 and the lower mill 11 for grinding to obtain white clay with uniform particles. During the grinding process, the heating element 12 in the upper mill 10 continues to heat and dry the white clay, thus obtaining dried white clay.

[0019] In this invention, a centrifugal dehydration and extrusion dehydration structure is used to dehydrate the white mud. After two dehydration treatments, the water content of the white mud is basically removed. Then, after two heating and drying processes, relatively dry white mud is obtained. The drying effect of the white mud is good, which is conducive to the powdering of white mud and improves the quality of white mud powder. Secondly, this invention uses a grinding method to grind the white mud, and sufficient dehydration treatment is carried out before grinding. This not only improves the grinding efficiency of white mud, but also improves the grinding effect, thereby obtaining white mud with uniform particles, which can meet the grinding requirements of white mud, improve the product quality of white mud, and meet the requirements for subsequent white mud reuse. In addition, the entire process of dehydration, drying and grinding of white mud can be automated, requiring little manual intervention and having high work efficiency.

[0020] The upper part of the dry grinding chamber 3 is connected to the dehydration chamber 2 via an upper air pipe 13. During operation, the device dehydrates the mud and then uses the heating element 12 to heat and dry it. This process generates a large amount of hot airflow, which carries a significant amount of heat. Directly discharging this hot airflow would undoubtedly waste heat. To avoid this waste, the upper air pipe 13 is installed to introduce the hot airflow into the dehydration chamber 2, preheating the mud within and raising its temperature. This improves the subsequent drying efficiency of the mud and reduces energy consumption to some extent.

[0021] To discharge the dried and ground white mud, a discharge port is provided at the bottom of the device, typically located near the side wall of the housing 1. A motor 14 is installed at the bottom of the housing 1, and the output shaft of the motor 14 is connected to the center of the lower mill 11 via a vertical shaft. A scraper 15 is installed on the vertical shaft below the lower mill 11, with its lower side contacting the bottom of the housing 1. The motor 14 drives the vertical shaft to rotate, which in turn drives the lower mill 11 and the scraper 15 to rotate. During rotation, the scraper 15 moves the dried white mud powder, guiding it to the discharge port for discharge, preventing the white mud from remaining and accumulating at the bottom of the housing 1.

[0022] A flushing pipe 16 is vertically installed inside the dehydration chamber 2 outside the water-spinning cylinder 4. The flushing pipe 16 is equipped with a water spray nozzle facing the water-spinning cylinder 4. After the device has been running for a period of time, some white mud may block the water outlet on the water-spinning cylinder 4, thereby affecting the dehydration effect of the white mud. Therefore, when the device is under maintenance or shut down, high-pressure clean water can be introduced into the flushing pipe 16 and the water-spinning cylinder 4 can be rotated. The high-pressure clean water can then be used to backwash the water-spinning cylinder 4 to wash off the blocked white mud, ensuring the dehydration efficiency and effect of the water-spinning cylinder 4 on the white mud.

[0023] A discharge pipe is installed at the bottom of the water-spinning cylinder 4, and a support frame 17 is installed inside the dewatering chamber 2. The support frame 17 and the discharge pipe are rotatably connected by bearings. During operation, the water-spinning cylinder 4 rotates at high speed, while the white mud is located inside the water-spinning cylinder 4. Due to the uneven distribution of the white mud inside the water-spinning cylinder 4, coupled with certain installation errors, the water-spinning cylinder 4 is prone to swaying and shaking, which is not conducive to the long-term normal operation of the device. In order to improve this problem, the support frame 17 is set. The support frame 17 is installed on the discharge pipe at the bottom of the water-spinning cylinder 4 through bearings, thereby adding a fulcrum at the bottom of the water-spinning cylinder 4 to position the water-spinning cylinder 4 and to limit its movement. This prevents the water-spinning cylinder 4 from swaying and shaking during rotation, thus extending the service life of the device.

[0024] A material-gathering cone 18 with a large opening facing upwards and a small opening facing downwards is provided in the dry grinding chamber 3 above the upper mill 10. When the present invention is in operation, the white clay is dried in the drying cylinder 8 and falls from the suspended end of the drying cylinder 8. Since the suspended ends of the two drying cylinders 8 are located on both sides inside the shell 1, the falling point of the white clay is relatively dispersed. In order to avoid this problem, the material-gathering cone 18 is provided to guide the falling white clay, gather the white clay together, and then guide it to the middle of the upper mill 10 to facilitate the subsequent grinding of the white clay.

[0025] The gap between the upper mill 10 and the lower mill 11 gradually decreases from top to bottom. The white clay is ground between the upper mill 10 and the lower mill 11, and the gap between the two gradually decreases from top to bottom, which gradually grinds the white clay into finer particles and improves the grinding effect of the white clay.

[0026] During actual operation, it was found that when dewatering white mud, some white mud would be discharged along with water from the outlet holes of the water-spinning cylinder 4 and the branch pipe 6, reducing the dewatering effect of the white mud. Nylon filter cloth 19 is installed on the inner wall of the water-spinning cylinder 4 and the branch pipe 6 respectively. The material of the nylon filter cloth 19 is nylon fiber, which has excellent wear resistance and tensile strength and can maintain good filtration performance under high pressure. The nylon filter cloth 19 has high filtration accuracy and can effectively prevent white mud particles from being discharged through the outlet holes due to the squeezing action during dewatering. Only the wastewater squeezed out from the white mud can be discharged through the nylon filter cloth 19.

Claims

1. A papermaking sludge drying and grinding device, comprising a housing (1) and a feed pipe disposed at the top of the housing (1), characterized in that: The interior of the shell (1) is divided into a dehydration chamber (2) and a dry grinding chamber (3) from top to bottom by a partition. A high-speed rotating water-spinning cylinder (4) is concentrically arranged in the upper part of the dehydration chamber (2). The lower end of the feed pipe is located above the water-spinning cylinder (4). A Y-shaped distribution pipe (5) is arranged below the water-spinning cylinder (4). A screw conveyor mechanism (7) is arranged in the two branch pipes (6) at the bottom of the distribution pipe (5). The lower end of the branch pipe (6) is fixedly connected to the shell (1). Several water outlet holes are machined on the side walls of the water-spinning cylinder (4) and the branch pipes (6). The bottom of the dehydration chamber (2) is provided with The upper part of the dry grinding chamber (3) is provided with two drying cylinders (8) at an incline. The higher end of the drying cylinder (8) is fixed to the shell (1) and the lower end is suspended. The bottom of the two branch pipes (6) are connected to the higher end of the corresponding drying cylinder (8) through a guide pipe. The drying cylinder (8) is provided with a stirring mechanism (9). The shell (1) below the drying cylinder (8) is fixed with an annular upper mill (10). The lower mill (11) that can rotate at high speed is provided below the upper mill (10). Heating elements (12) are provided in the upper mill (10) and on the drying cylinder (8).

2. The papermaking bleach drying and grinding device according to claim 1, characterized in that: The upper part of the dry grinding chamber (3) is connected to the dehydration chamber (2) through the upper air pipe (13).

3. The papermaking white mud drying and grinding device according to claim 1, characterized in that: A motor (14) is installed at the bottom of the housing (1). The output shaft of the motor (14) is connected to the center of the lower mill (11) via a vertical shaft. A scraper (15) is provided on the vertical shaft below the lower mill (11). The lower side of the scraper (15) is in contact with the bottom of the housing (1).

4. The papermaking bleach drying and grinding device according to claim 1, characterized in that: A flushing pipe (16) is vertically installed inside the dehydration chamber (2) outside the water-spinning cylinder (4), and a water spray nozzle is provided on the flushing pipe (16) facing the water-spinning cylinder (4).

5. The papermaking white mud drying and grinding device according to claim 1, characterized in that: The bottom of the water-spraying cylinder (4) is provided with a discharge pipe, and the dehydration chamber (2) is provided with a support frame (17). The support frame (17) and the discharge pipe are rotatably connected by a bearing.

6. The papermaking bleach drying and grinding device according to claim 1, characterized in that: A material-gathering cone (18) with its large opening facing upwards and its small opening facing downwards is installed in the dry grinding chamber (3) above the upper mill (10).

7. The papermaking bleach drying and grinding device according to claim 1, characterized in that: The gap between the upper grinding wheel (10) and the lower grinding wheel (11) gradually decreases from top to bottom.

8. The papermaking white mud drying and grinding device according to claim 1, characterized in that: Nylon filter cloth (19) is provided on the inner wall of the water-spinning cylinder (4) and the branch pipe (6).

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