Impurity intercepting mechanism and pulverized coal screw conveyor

Abstract

The invention relates to the technical field of conveyors, in particular to an impurity intercepting mechanism and a pulverized coal screw conveyor, the impurity intercepting mechanism comprises a weight intercepting part with meshes and a fiber intercepting part with a hook, the weight intercepting part is located below the fiber intercepting part, the height of the weight intercepting part accounts for one fifth to two fifths of the height of the impurity intercepting mechanism, and the weight intercepting part is located below the fiber intercepting part. The device is mainly installed in a pulverized coal spiral conveyor, the weight intercepting part on the lower portion is mainly used for intercepting impurities such as keel steel bars and ceramic chips, and the fiber intercepting part on the upper portion is mainly used for intercepting fibers; the device is installed on the pulverized coal conveyor, the probability that keel strips, tiles and fibrous materials enter a pulverized coal storage tank can be greatly reduced through multiple times of interception, the risk that sundries are clamped by spiral blades of a spiral conveyor is reduced, and long-term stable operation of a production system is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of conveyors, and in particular to a debris intercepting mechanism and a pulverized coal screw conveyor. Background Art

[0002] In the coal gasification device, the current dry coal powder gasification furnace has a relatively high requirement for the removal rate of debris in the pulverized coal. If the coal powder contains porcelain pieces that have fallen off the inner wall of the pipeline, cotton, linen and other fluff debris, it will cause the coal line angle valve to be blocked and the coal line to be broken. In severe cases, it will cause the gasifier to shut down, which is a major hidden danger in the production and operation of the coal gasification device.

[0003] At present, for fibers of filaments such as cotton and linen, an electric fiber separator is generally installed to remove the fibers before the pulverized coal enters the screw conveyor. The fiber separator can only remove about 98% of the fibers, especially for small pieces of ceramic pieces, filter bag keel steel bars, etc. that are worn, broken and fallen off after long-term use of the equipment itself. Once these foreign objects enter the screw conveyor, they are brought into the pulverized coal conveying system, causing the debris to block the coal line angle valve, affecting the safe and stable operation of the pulverized coal conveying system. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a debris interception mechanism and a pulverized coal screw conveyor, the purpose of which is to remove the unseparated debris during the pulverized coal conveying process and ensure the safe and stable operation of the pulverized coal conveying system.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A debris interception mechanism comprises a heavy object interception part with mesh holes and a fiber interception part with hooks, wherein the heavy object interception part is located below the fiber interception part, and the height of the heavy object interception part accounts for one fifth to two fifths of the height of the debris interception mechanism.

[0007] At present, electric fiber separators are generally installed to remove fibers of filaments such as cotton and linen before the pulverized coal enters the screw conveyor. However, in actual operation, 100% removal cannot be achieved. There is still a small part of the fibers in the raw coal, the wear-resistant ceramic pieces on the inner wall of the pipeline, and the small sections of keel steel bars less than 10 cm in length that cannot be intercepted. These foreign objects are generally caused by long-term use of the equipment, aging, and damage, and finally gradually fall off and enter the pulverizing system.

[0008] Fibers that are not removed by the electric fiber separator and foreign matter that falls off the equipment can only be removed inside the screw conveyor. The pulverized coal screw conveyor used in the pulverized coal gasification device generally has 4-5 bearings in the middle, depending on the length of the conveyed material. Because there is no spiral blade push at the bearing position, if there are keel steel bars, ceramic pieces and other debris in the screw conveyor at this time, they will fall under the action of gravity and usually accumulate at the bearing bracket. Setting a debris interception mechanism here can effectively prevent foreign matter from being transported by the screw conveyor.

[0009] The invention is mainly installed in a screw conveyor of pulverized coal. The lower heavy object interception part of the invention is mainly used to intercept sundries such as keel steel bars and ceramic pieces, and the upper fiber interception part is mainly used to intercept fibers.

[0010] Furthermore, the hook is composed of two metal short sections which are at an angle to each other, and the ends of the two metal short sections both have gradual tips, and the tips are both inclined upward.

[0011] Furthermore, each of the metal short sections has a diameter of 2 mm and a length of 7 mm-10 mm, an angle of 60° is formed between the two metal short sections, and an angle of 15° is formed between the plane where the two metal short sections are located and the horizontal plane.

[0012] The hook tip composed of metal short sections is tilted upward, which can effectively hook the fiber. The two metal short sections that constitute the hook are at an angle of 60 degrees and are in an outwardly expanding state, which expands the hooking range. At the same time, the upward metal short sections can effectively hook the fiber.

[0013] Furthermore, the distance between two horizontally adjacent hooks and the distance between two vertically adjacent hooks on the fiber intercepting portion are both 7 cm to 12 cm.

[0014] The hook intervals of the fiber interception part are large, which can ensure the smooth passage of pulverized coal, reduce the resistance of pulverized coal transportation, and also avoid the transmission shaft.

[0015] Furthermore, a connecting ring is provided outside the fiber intercepting part and the heavy object intercepting part. The connecting ring is a circular ring with an opening formed by bending a wear-resistant metal plate strip. The fiber intercepting part and the heavy object intercepting part are fixedly connected to the inner wall of the connecting ring.

[0016] The open ring can directly install the present invention into the shell and fix it, and the installation and disassembly are relatively convenient, avoiding the transmission shaft, so that the coal conveyor does not need to be disassembled during installation, and the installation can be convenient and quick.

[0017] Furthermore, the connecting ring is provided with a plurality of bolt holes in an array.

[0018] The bolt holes are easy to install, and the plurality of spiral holes also have the effect of adjusting the angle of the invention, so that the interception effect of the invention is better.

[0019] A pulverized coal screw conveyor, the screw conveyor comprises a driving motor and a working section, the working section comprises a shell, a multi-section transmission shaft and spiral blades, a plurality of bearing brackets are arranged in the middle part except the head end and the tail end bearings, each bearing bracket is provided with a bearing, the bearing has an inner rod, flanges are arranged at both ends of the inner rod, the multi-section transmission shaft is connected with the inner rod of the bearing via the flange to form a full-length rotating shaft, a spiral blade is arranged outside each section of the transmission shaft, and the end of each section of the spiral blade is spaced from the adjacent bearing bracket; the above-mentioned debris interception mechanism is also included, the debris interception mechanism is limitedly connected to the bearing bracket or the inner wall of the shell, the debris interception mechanism is located between the inner rod flange and the bearing bracket on the side of the bearing bracket close to the feed end of the shell, and the hook faces the feed end of the shell.

[0020] Furthermore, the debris interception mechanism is connected to the bearing bracket via bolts, or a limiting groove is provided on the inner side wall of the shell, and the debris interception mechanism is embedded in the limiting groove.

[0021] Furthermore, a collection box adjacent to the debris interception mechanism is provided below each of the debris interception mechanisms, the upper end of the collection box is connected to the shell, a stop valve is provided on the upper part of the collection box, and there is a distance between the stop valve and the shell.

[0022] The collecting box is mainly used to collect the sundries intercepted by the heavy object intercepting part. There is a distance between the stop valve and the shell. After being intercepted, the heavy objects sink to the stop valve and escape from the shell, preventing them from passing through the heavy object intercepting part due to the pushing of the pulverized coal during the pulverized coal transportation process.

[0023] Furthermore, a filter screen is provided at the lower part of the collecting box, a nitrogen delivery pipe is connected to the side wall of the collecting box between the filter screen and the stop valve, the lower end of the collecting box is connected to the pulverized coal storage tank through a pipeline, and a manhole door is provided on the side wall of the collecting box.

[0024] The filter is used to filter the pulverized coal and debris. The nitrogen delivery pipe delivers nitrogen to purge the filter, so that the pulverized coal passes through the filter and the debris remains, completing the separation of the pulverized coal and the debris. Finally, the manhole door is opened to clean the debris.

[0025] Furthermore, the housing is provided with a bearing cover located above each bearing.

[0026] The bearing cover on the housing is mainly used to repair the bearing, and also to clean the fibers on the hook.

[0027] Beneficial Effects

[0028] 1. The present invention has a better interception effect on pulverized coal impurities that are not easily removed by the front electric fiber separator.

[0029] 2. The present invention has multiple, identical debris interception mechanisms at each bearing. Through multiple interceptions, the probability of keel bars, ceramic pieces, and fiber materials entering the pulverized coal storage tank can be greatly reduced, and the risk of the spiral blades of the screw conveyor getting stuck with debris is reduced, thereby ensuring the long-term and stable operation of the production system.

[0030] 3. The present invention has a good separation effect on the debris, will not cause the loss of pulverized coal, and the cleaning process is relatively safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a debris interception mechanism of the present invention;

[0032] Figure 2 It is a structural schematic diagram of a screw conveyor of the present invention;

[0033] Figure 3 yes Figure 2 A magnified view of part A

[0034] Figure 4 It is a sectional right view of the connection between the debris interception mechanism and the bearing bracket.

[0035] The numbers in the attached drawings are: 1, mesh; 2, heavy object interception part; 3, hook; 4, fiber interception part; 5, grid steel bar; 6, connecting ring; 7, bolt hole; 8, driving motor; 9, working section; 10, shell; 11, transmission shaft; 12, spiral blade; 13, bearing bracket; 14, bearing; 15, bearing cover; 16, collecting box; 17, stop valve; 18, filter screen; 19, nitrogen delivery pipe; 20, pulverized coal storage tank; 21, manhole door. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0037] A debris interception mechanism is connected to a bearing bracket 13 in a screw conveyor, and includes a heavy object interception portion 2 with a mesh 1 and a fiber interception portion 4 with a hook 3. The heavy object interception portion 2 is located below the fiber interception portion 4. The height of the heavy object interception portion 2 accounts for one-fifth to two-fifths of the height of the debris interception mechanism. In this embodiment, the height of the heavy object interception portion 2 accounts for one-third of the height of the debris interception mechanism.

[0038] like Figure 1As shown, in this embodiment, the debris interception mechanism is made of high temperature resistant, corrosion resistant and wear resistant stellite alloy. The lower part of the debris interception mechanism is a heavy object interception part 2 and the upper part is a hook 3; the heavy object interception part 2 is a mesh body made of a stellite alloy rod with a diameter of 3mm, and the mesh is a square hole of 1cm×1cm; it can also be a rectangular hole, but its long side is vertically arranged, which can improve the interception effect, but the long side should not exceed 1.5cm to prevent debris from passing through, and vertical grid steel is arranged above the heavy object interception part 2 The spacing of the grid steel bars 5 is 7cm-12cm, which can be adjusted according to the diameter of the drive shaft 11 of the screw conveyor. In this embodiment, it is set to 7cm. The grid steel bars 5 are connected with hooks 3 at intervals, and the distance between two adjacent hooks 3 is 7cm. Each of the hooks 3 is composed of two metal short sections with a diameter of 2mm and a length of 7mm-10mm. The two metal short sections form an angle of 60° between each other, and the plane where the two metal short sections are located is inclined upward at an angle of 15° to the horizontal plane. The ends of the two metal short sections have a tip with a gradually decreasing diameter.

[0039] Among them, the heavy object interception part 2 is mainly used to intercept high-density debris, because this type of debris has a high density and is easy to sink to the bottom of the pulverized coal and can be intercepted by the heavy object interception part 2, such as keel steel bars or ceramic pieces. The hook 3 is mainly used to intercept fibrous debris, which is easy to hang on the hook 3 as the material flows. The grid steel bars 5 have a large spacing, which can allow the pulverized coal to pass smoothly and reduce the transportation resistance.

[0040] The fiber intercepting part 4 and the heavy object intercepting part 2 are provided with a connecting ring 6 outside. The connecting ring 6 is a circular ring with an opening formed by bending a wear-resistant metal plate strip. The fiber intercepting part 4 and the heavy object intercepting part 2 are fixedly connected to the inner wall of the connecting ring 6. The connecting ring 6 is arrayed with multiple bolt holes 7.

[0041] The opening of the connecting ring 6 is mainly used to avoid the transmission shaft 11 of the screw conveyor to achieve convenient installation and disassembly. The bolt holes 7 are relatively dense. On the one hand, it can strengthen the connection. On the other hand, the angle of the debris interception mechanism can be adjusted according to actual needs. This is because the pulverized coal in the screw conveyor is not always located at the lower part of the shell 10, but often deviates from the lower part of the shell 10 by a certain angle during the transportation process. Therefore, the debris interception mechanism can better achieve the interception effect when it is deflected by a certain angle. The relatively dense bolt holes 7 can make the angle adjustment more matched with the deflection during material transportation.

[0042] like Figure 2 , Figure 3 and Figure 4As shown, a pulverized coal screw conveyor comprises a driving motor 8 and a working section 9, the conveying shaft of the driving motor 8 faces left, the working section 9 comprises a housing 10, a multi-section transmission shaft 11 and a spiral blade 12, the housing 10 is about 20m long, and there are four bearing brackets 13 in the middle part except the head end and the tail end bearings, each bearing bracket 13 is provided with a bearing 14, the bearing 14 has an inner rod, and flanges are provided at both ends of the inner rod. The multi-section transmission shaft is connected with the inner rod of the bearing through the flange to form a full-length rotating shaft, and a spiral blade 12 is provided outside each section of the transmission shaft, and there is a spacing between the end of each section of the spiral blade 12 and the adjacent bearing bracket 13, and the spacing is the position where debris is easily accumulated; the above-mentioned debris interception mechanism is provided on the right side of each bearing bracket 13 of the screw conveyor, and the debris interception mechanism is connected to the bearing bracket 13 through bolts or a limit groove is provided on the inner side wall of the housing 10, and the limit groove is a groove body corresponding to the connecting ring, and the debris interception mechanism is embedded in the limit groove.

[0043] There are many options for the connection position of the debris interception mechanism, including but not limited to connecting to the bearing bracket 13 or connecting to the limiting groove of the housing 10, as long as the debris interception mechanism is located between the flange at the right end of the inner rod and the bearing bracket 13.

[0044] A bearing cover 15 corresponding to the bearing 14 is provided on the housing 10, which is mainly used for the inspection and maintenance of the bearing 14. The bearing cover 15 can also be opened to clean up debris. However, it is inconvenient to clean the keel steel bars or ceramic pieces sunk to the bottom of the material from the bearing cover 15. On the one hand, they sink to the bottom of the housing 10 and are inconvenient to take out. On the other hand, these debris usually have sharp burrs, which can easily cause injuries. Therefore, it is necessary to make further improvements to the impurity removal of the screw conveyor.

[0045] A collecting box 16 adjacent to the debris intercepting mechanism is provided at the lower part of the shell 10 and on the right side of the bearing bracket 13. The upper end of the collecting box 16 is connected to the shell, and a stop valve 17 is provided at the upper part of the collecting box. The stop valve 17 is in the form of a gate valve to reduce the influence of debris on the opening and closing of the valve. There is a distance between the upper end of the gate valve and the shell. This distance enables the debris with higher density such as keel steel bars or ceramic pieces to sink to the valve plate of the gate valve when there is no spiral blade 12 to push, thereby separating from the shell 10 and not affecting the material conveying. At the same time, the debris will not be squeezed through the heavy object intercepting part 2 due to the material conveying. When cleaning the debris, it is only necessary to open the gate valve to enable the material above the valve plate of the gate valve to fall into the collecting box 16, so as to achieve the effect of cleaning the debris.

[0046] After the material on the valve plate falls into the collecting box 16, it will carry pulverized coal with it, and it is difficult to separate the debris. Therefore, a filter screen 18 is arranged at the lower part of the collecting box 16. The hole of the filter screen 18 is 1.5mm×1.5mm. In order to prevent the pulverized coal from generating a bridging effect on the filter screen 18, a nitrogen delivery pipe 19 is also connected to the collecting box 16. When the nitrogen delivery pipe 19 delivers nitrogen to the collecting box 16, the nitrogen purges the pulverized coal, so that the pulverized coal passes through the filter screen 18, and the debris is retained on the filter screen 18. A square manhole door 21 is provided on the side wall of the collecting box 16, which is kept closed. When it is necessary to clean up the debris, the manhole door 21 can be opened for cleaning, and the fiber is still cleaned by the bearing cover 15.

[0047] The lower end of the collecting box 16 is connected to the pulverized coal storage tank 20 via a DN50 pipeline, so that the pulverized coal is transported to the storage space, while the sundries remain in the collecting box 16 .

[0048] Because the pulverized coal in the electric fiber separator passes through the fiber separator in a vertical direction, and the pulverized coal in the screw conveyor is pushed forward in a horizontal direction; the horizontal interception of the screw conveyor makes up for the deficiency of the vertical interception of the electric fiber separator, especially objects like keel steel bars, which cannot be removed by the electric fiber separator but can be effectively intercepted in the screw conveyor; therefore, it can serve as an important supplement to the fiber separator for removing debris.

[0049] When conveying pulverized coal, the gate valve and the bearing cover 15 are kept in a closed state, and the screw conveyor is used normally. At regular intervals, the screw conveyor is shut down for maintenance and debris is cleaned up. The bearing cover 15 is opened to clean the fibers hooked on the hook 3, and then the bearing cover 15 is closed, and the stop valve 17 is opened to allow the material on the valve plate to fall onto the filter screen 18 in the collection box 16. After closing the stop valve 17, nitrogen is conveyed into the collection box 16 through the nitrogen conveying pipe 19 to purge the collection box 16. The pulverized coal is filtered through the filter screen 18 and then conveyed to the storage space. The debris is retained in the collection box 16, and the nitrogen conveying is closed, and the manhole door 21 is opened to clean up the debris.

[0050] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

Claims

1. A debris interception mechanism, It is characterized in that It comprises a heavy object intercepting portion (2) having a mesh (1) and a fiber intercepting portion (4) having a hook (3), wherein the heavy object intercepting portion (2) is located below the fiber intercepting portion (4), and the height of the heavy object intercepting portion (2) accounts for one fifth to two fifths of the height of the debris intercepting mechanism.

2. The debris interception mechanism according to claim 1, It is characterized in that The hook (3) is composed of two metal short sections which are angled with each other, and the ends of the two metal short sections both have gradually pointed parts, and the pointed parts both tilt upwards.

3. The debris interception mechanism according to claim 2, It is characterized in that The diameter of each metal short section is 2 mm and the length is 7 mm-10 mm. The two metal short sections form an angle of 60° between each other, and the plane where the two metal short sections are located forms an angle of 15° with the horizontal plane.

4. The debris interception mechanism according to claim 1, It is characterized in that The distance between two horizontally adjacent hooks (3) and the distance between two vertically adjacent hooks (3) on the fiber intercepting portion (4) are both 7 cm to 12 cm.

5. The debris interception mechanism according to claim 1, It is characterized in that The fiber interception part (4) and the heavy object interception part (2) are provided with a connecting ring (6) outside. The connecting ring (6) is a circular ring with an opening formed by bending a wear-resistant metal plate strip. The fiber interception part (4) and the heavy object interception part (2) are both fixedly connected to the inner wall of the connecting ring (6).

6. The debris interception mechanism according to claim 5, It is characterized in that The connecting ring (6) is provided with a plurality of bolt holes (7) in an array.

7. A pulverized coal screw conveyor, comprising a driving motor (8) and a working section (9), wherein the working section (9) comprises a housing (10), a multi-section transmission shaft (11) and a spiral blade (12), wherein a plurality of bearing brackets (13) are provided in the middle portion except for the head end and the tail end, wherein each bearing bracket (13) is provided with a bearing (14), wherein the bearing (14) has an inner rod, and flanges are provided at both ends of the inner rod, wherein the multi-section transmission shaft (11) is connected to the inner rod of the bearing (14) via the flange to form a continuous rotating shaft, wherein a spiral blade (12) is provided outside each section of the transmission shaft (11), and a spacing is provided between the end of each section of the spiral blade (12) and the adjacent bearing bracket (13), It is characterized in that It also includes the debris interception mechanism described in any one of claims 1 to 6, wherein the debris interception mechanism is limitedly connected to the bearing bracket (13) or the inner wall of the shell (10), and the debris interception mechanism is located between the inner rod flange of the bearing bracket (13) on the side close to the feed end of the shell (10) and the bearing bracket (13), and the hook (3) is facing the feed end of the shell.

8. The pulverized coal screw conveyor according to claim 7, It is characterized in that A collection box (16) adjacent to the debris interception mechanism is provided below each debris interception mechanism, the upper end of the collection box (16) is connected to the shell (10), a stop valve (17) is provided at the upper part of the collection box (16), and a distance is provided between the stop valve (17) and the shell (10).

9. The pulverized coal screw conveyor according to claim 8, It is characterized in that A filter screen (18) is provided at the lower part of the collecting box (16); a nitrogen delivery pipe (19) is connected to the side wall of the collecting box (16) between the filter screen (18) and the stop valve (17); the lower end of the collecting box (16) is connected to a pulverized coal storage tank (20) via a pipeline; and a manhole door (21) is provided on the side wall of the collecting box (16).

10. The pulverized coal screw conveyor according to claim 7, It is characterized in that The housing (10) is provided with a bearing cover (15) located above each bearing (14).

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