Impurity intercepting mechanism and pulverized coal screw conveyor

Abstract

The utility model relates to the technical field of conveyors, in particular to an impurity intercepting mechanism and a pulverized coal screw conveyor, which comprise a weight intercepting part with meshes and a fiber intercepting part with a hook, the height of the heavy object intercepting part accounts for 1 / 5 to 2 / 5 of the height of the impurity intercepting mechanism, the impurity intercepting device is mainly installed in a spiral conveyor of pulverized coal, the heavy object intercepting part at the lower part of the impurity intercepting device is mainly used for intercepting impurities such as keel steel bars and ceramic chips, and the fiber intercepting part at the upper part of the impurity intercepting device is mainly used for intercepting fibers; the pulverized coal conveying 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 utility model relates to the technical field of conveyors, in particular to a sundry intercepting mechanism and a pulverized coal screw conveyor. Background Technique

[0002] In a coal gasification device, the current dry pulverized coal gasifier has relatively high requirements for the removal rate of sundries in pulverized coal. If there are porcelain chips peeled off from the inner wall of the pipeline, cotton and linen and other flocculent sundries in the pulverized coal, it will cause the blockage of the coal line angle valve and the interruption of the coal line. Seriously, it will lead to the shutdown accident of the gasifier, which is a major hidden danger in the production operation of the coal gasification device.

[0003] At present, for fibers such as cotton and linen, an electric fiber separator is generally installed before the pulverized coal enters the screw conveyor to remove the fiber substances. The ability of the fiber separator to remove fibers can only reach about 98%. Especially for small ceramic chips, filter bag keel steel bars, etc. that are worn, broken and shed after long-term use of the equipment itself, the interception ability is poor. Once these foreign matters enter the screw conveyor, they will be carried into the pulverized coal conveying system, resulting in the blockage of the coal line angle valve by sundries and affecting the safe and stable operation of the pulverized coal conveying system. Summary of the Utility Model

[0004] To solve the above problems, the utility model provides a sundry intercepting mechanism and a pulverized coal screw conveyor, aiming to remove the sundries that have not been separated during the pulverized coal conveying process and ensure the safe and stable operation of the pulverized coal conveying system.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A sundry intercepting mechanism includes a heavy object intercepting part with mesh holes and a fiber intercepting part with hooks. The heavy object intercepting part is located below the fiber intercepting part, and the height of the heavy object intercepting part accounts for one-fifth to two-fifths of the height of the sundry intercepting mechanism.

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

[0008] The fibrous materials not removed by the electric fiber separator and the foreign objects falling off inside 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 according to the length of the conveyed material. Since there is no screw blade to push at the position of the bearings, if there are sundries such as keel steel bars and ceramic chips in the screw conveyor at this time, they will fall under the action of gravity and usually accumulate at the bearing support. Setting a sundry interception mechanism here can effectively prevent foreign objects from being conveyed by the screw conveyor.

[0009] The utility model is mainly installed inside the screw conveyor of pulverized coal. The heavy object interception part at the lower part of the utility model is mainly used to intercept sundries such as keel steel bars and ceramic chips, and the fiber interception part at the upper part is mainly used to intercept fibers.

[0010] Furthermore, the hook is composed of two metal short sections that form an angle with each other. The ends of the two metal short sections both have gradually pointed parts, and the pointed parts are inclined upward.

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

[0012] The tip of the hook composed of metal short sections is inclined upward, which can effectively hook fibers. The angle between the two metal short sections forming the hook is 60°, showing an outward expanding state, expanding the hooking range. At the same time, the upwardly raised metal short sections can effectively hook fibrous materials.

[0013] Furthermore, the distance between two horizontally adjacent hooks and the distance between two vertically adjacent hooks on the fiber interception part are both 7cm - 12cm.

[0014] The hooks on the fiber interception part have a relatively large interval, which can ensure the smooth passage of pulverized coal, reduce the conveying resistance of pulverized coal, and at the same time can avoid the transmission shaft.

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

[0016] The open-ring can directly install the utility model into the shell and achieve fixation. The installation and disassembly are both relatively convenient, and it can avoid the transmission shaft. Therefore, it is not necessary to disassemble the coal conveyor during installation, and it can be installed conveniently and quickly.

[0017] Furthermore, a plurality of bolt holes are arrayed on the connecting ring.

[0018] The bolt holes are convenient for installation. At the same time, multiple spiral holes also have the effect of adjusting the angle of the present utility model, making the interception effect of the present utility model better.

[0019] A pulverized coal screw conveyor, which includes a driving motor and a working section. The working section includes a housing, multiple sections of transmission shafts and spiral blades. There are multiple bearing brackets at the intermediate part except for the bearings at the head and tail ends. Each bearing bracket is provided with a bearing. The bearing has an inner rod, and flanges are provided at both ends of the inner rod. Multiple sections of transmission shafts are connected to the inner rod of the bearing through the flanges to form a through-long rotating shaft. A spiral blade is provided outside each section of the transmission shaft, and there is a spacing between the end of each spiral blade and the adjacent bearing bracket; it also includes the above-mentioned sundry interception mechanism. The sundry interception mechanism is connected to the bearing bracket or the inner wall of the housing in a limited way. The sundry interception mechanism is located between the inner rod flange of the bearing bracket close to the feeding end of the housing and the bearing bracket, and the hook faces the feeding end of the housing.

[0020] Further, the sundry interception mechanism is connected to the bearing bracket by bolts, or a limiting groove is provided on the inner side wall of the housing, and the sundry interception mechanism is clamped in the limiting groove.

[0021] Further, a collection box adjacent to the sundry interception mechanism is provided below each sundry interception mechanism. The upper end of the collection box communicates with the housing. A cut-off valve is provided at the upper part of the collection box, and there is a spacing between the cut-off valve and the housing.

[0022] The collection box is mainly used to collect the sundries intercepted by the heavy object interception part. There is a spacing between the cut-off valve and the housing. After the heavy object is intercepted, it sinks onto the cut-off valve and disengages from the housing, preventing it from passing through the heavy object interception part due to the pushing of pulverized coal during the pulverized coal conveying process.

[0023] Further, a filter screen is provided at the lower part of the collection box. A nitrogen delivery pipe is communicated with the side wall of the collection box between the filter screen and the cut-off valve. The lower end of the collection box is communicated with a pulverized coal storage tank through a pipeline, and a manhole door is provided on the side wall of the collection box.

[0024] The filter screen is used to filter pulverized coal and sundries. The nitrogen delivery pipe delivers nitrogen to blow the filter screen, so that the pulverized coal passes through the filter screen while the sundries are left behind, completing the separation of pulverized coal and sundries. Finally, the manhole door is opened to clean the sundries.

[0025] Further, a bearing cover is provided on the housing above each bearing.

[0026] The bearing cover on the housing is mainly used for repairing the bearing, and at the same time, it also has the function of cleaning the fibrous substances on the hook.

[0027] Beneficial effects

[0028] 1. The utility model has a good interception effect on pulverized coal debris that is not easily removed by the front-mounted electric fiber separator.

[0029] 2. There are multiple of the utility model, and the same debris interception mechanism is provided at each bearing. Through multiple interceptions, the probability of keel strips, porcelain chips, and fibrous materials entering the pulverized coal storage tank can be greatly reduced, and the risk of the spiral blades of the screw conveyor being stuck by debris is reduced, ensuring the long-term stable operation of the production system.

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

[0031] Figure 1 is a schematic structural diagram of a debris interception mechanism of the utility model;

[0032] Figure 2 is a schematic structural diagram of a screw conveyor of the utility model;

[0033] Figure 3 is Figure 2 an enlarged view of part A of

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

[0035] The reference numerals in the drawings are: 1, mesh holes; 2, heavy object interception part; 3, hook; 4, fiber interception part; 5, grid steel bars; 6, connecting ring; 7, bolt holes; 8, drive motor; 9, working section; 10, housing; 11, transmission shaft; 12, spiral blades; 13, bearing bracket; 14, bearing; 15, bearing cover; 16, collection box; 17, stop valve; 18, filter screen; 19, nitrogen delivery pipe; 20, pulverized coal storage tank; 21, manhole door. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to make the purpose, technical solutions and advantages of the utility model clearer, the following combines specific embodiments to further elaborate on the utility model.

[0037] A debris interception mechanism is connected to the bearing bracket 13 inside the screw conveyor, and includes a heavy object interception part 2 with mesh holes 1 and a fiber interception part 4 with hooks 3. The heavy object interception part 2 is located below the fiber interception part 4, and the height of the heavy object interception part 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 part 2 accounts for one-third of the height of the debris interception mechanism.

[0038] As Figure 1As shown, in this embodiment, the sundry interception mechanism is made of stellite alloy with high temperature resistance, corrosion resistance and wear resistance. The lower part of the sundry interception mechanism is the heavy object interception part 2, and the upper part is the hook 3. The heavy object interception part 2 is a net body made of stellite alloy rods with a diameter of 3 mm, and the mesh holes are square holes of 1 cm×1 cm. It can also be rectangular holes, but the long side is set vertically, which can improve the interception effect, but the long side should not exceed 1.5 cm to prevent sundries from passing through. Vertically arranged grid steel bars 5 are spaced above the heavy object interception part 2. The spacing of the grid steel bars 5 is 7 cm - 12 cm, which can be adjusted according to the diameter of the transmission shaft 11 of the screw conveyor. In this embodiment, it is set to 7 cm. Hooks 3 are connected to the grid steel bars 5 at intervals. The distance between two adjacent hooks 3 is 7 cm. Each hook 3 is composed of two metal short segments with a diameter of 2 mm and a length of 7 mm - 10 mm. There is an included angle of 60° between the two metal short segments. The plane where the two metal short segments are located is inclined upward at an angle of 15° to the horizontal plane. The ends of the two metal short segments both have pointed parts with gradually decreasing diameters.

[0039] Among them, the heavy object interception part 2 is mainly used to intercept sundries with higher density. Because such sundries have a high density and are easy to sink to the lower part of the pulverized coal, they can be intercepted by the heavy object interception part 2, such as keel steel bars or ceramic chips. The hook 3 is mainly used to intercept fiber-like sundries. Fiber-like sundries are easily hung on the hook 3 along with the material flow. The grid steel bars 5 have a relatively large spacing, which can enable the pulverized coal to pass smoothly and reduce the conveying resistance.

[0040] An outer connection ring 6 is provided on the fiber interception part 4 and the heavy object interception part 2. The connection ring 6 is a ring with an opening formed by bending a wear-resistant metal strip. Both the fiber interception part 4 and the heavy object interception part 2 are fixedly connected to the inner wall of the connection ring 6. A plurality of bolt holes 7 are arranged in an array on the connection ring 6.

[0041] The opening of the connection ring 6 is mainly used to avoid the transmission shaft 11 of the screw conveyor, realizing 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 sundry interception mechanism can be adjusted according to actual needs. Because the pulverized coal in the screw conveyor is not always located at the lower part of the housing 10, but often deviates from the lower part of the housing 10 by a certain angle during the conveying process. Therefore, when the sundry interception mechanism also deflects by a certain angle, it can better achieve the interception effect. The relatively dense bolt holes 7 can make the angle adjustment more matched with the deflection during the material conveying process.

[0042] Such as Figure 2 、 Figure 3 and Figure 4As shown in the figure, there is a pulverized coal screw conveyor, which includes a driving motor 8 and a working section 9. The conveying shaft of the driving motor 8 faces left. The working section 9 includes a housing 10, multiple sections of transmission shafts 11 and screw blades 12. The housing 10 is about 20 m long, and there are four bearing brackets 13 at the middle part except for the head and tail 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 multiple sections of transmission shafts are connected to the inner rod of the bearing through the flanges to form a continuous rotating shaft. Screw blades 12 are provided outside each section of the transmission shaft. There is a gap between the end of each section of the screw blade 12 and the adjacent bearing bracket 13, and this gap is the position where sundries are likely to accumulate; on the right side of each bearing bracket 13 of the screw conveyor, there is the above-mentioned sundry interception mechanism. The sundry interception mechanism is connected to the bearing bracket 13 by bolts or there is a limiting groove on the inner side wall of the housing 10. The limiting groove is a groove body corresponding to the connecting ring, and the sundry interception mechanism is clamped in the limiting groove.

[0043] There are various choices for the connection position of the sundry interception mechanism, including but not limited to being connected to the bearing bracket 13 or connected in the limiting groove of the housing 10, as long as the sundry interception mechanism is located between the flange at the right end of the inner rod and the bearing bracket 13.

[0044] The housing 10 is provided with a bearing cover 15 corresponding to the bearing 14, which is mainly used for the maintenance of the bearing 14. Opening the bearing cover 15 can also clean sundries. However, for the keel steel bars or ceramic chips sunk under the materials, it is not convenient to clean them from the bearing cover 15. On the one hand, they sink to the bottom of the housing 10 and are not easy to take. On the other hand, these sundries usually have sharp burrs and are easy to hurt people. Therefore, further improvement is needed for the removal of impurities in the screw conveyor.

[0045] A collection box 16 is provided on the lower part of the housing 10 and on the right side of the bearing bracket 13, adjacent to the sundry interception mechanism. The upper end of the collection box 16 is connected to the housing, and a stop valve 17 is provided at the upper part of the collection box 16. The stop valve 17 adopts the form of a slide gate valve to reduce the influence of sundries on the opening and closing of the valve. There is a gap between the upper end of the slide gate valve and the housing. This gap enables sundries with a relatively large density such as keel steel bars or ceramic chips to sink onto the valve plate of the slide gate valve when there is no push from the screw blade 12, so as to separate from the housing 10 and not affect the material conveying. At the same time, the sundries will not be squeezed through the heavy object interception part 2 due to the material conveying. When cleaning sundries, only need to open the slide gate valve to make the materials above the valve plate of the slide gate valve fall into the collection box 16 to achieve the effect of cleaning sundries.

[0046] After the materials on the valve plate fall into the collection box 16, they will carry pulverized coal, and it is difficult to separate sundries. Therefore, a filter screen 18 is arranged at the lower part of the collection box 16. The holes of the filter screen 18 are 1.5 mm × 1.5 mm. 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 collection box 16. When the nitrogen delivery pipe 19 delivers nitrogen to the collection box 16, the nitrogen purges the pulverized coal, causing the pulverized coal to pass through the filter screen 18, and the sundries remain on the filter screen 18. A square manhole door 21 is arranged on the side wall of the collection box 16 and remains in a closed state. When it is necessary to clean the sundries, the manhole door 21 can be opened for cleaning, and the fibers are still cleaned from the bearing cover 15.

[0047] The lower end of the collection box 16 is connected to the pulverized coal storage tank 20 through a DN50 pipe to convey the pulverized coal to the storage space, while the sundries remain in the collection box 16.

[0048] Since the pulverized coal of the electric fiber separator passes through the fiber separator in the vertical direction, and the pulverized coal of the screw conveyor advances horizontally; the horizontal interception of the screw conveyor makes up for the deficiency of the vertical interception of the electric fiber separator. Especially for objects such as keel steel bars, the electric fiber separator cannot remove them, but they can be effectively intercepted in the screw conveyor; therefore, it can be an important supplement to the fiber separator for removing sundries.

[0049] When conveying the pulverized coal, both the plug valve and the bearing cover 15 remain closed, and the screw conveyor is used normally. At regular intervals, the screw conveyor is shut down for maintenance, and at the same time, the sundries are cleaned. The bearing cover 15 is opened to clean the fibers hooked on the hook 3, and then the bearing cover 15 is closed. The stop valve 17 is opened to make the materials on the valve plate fall onto the filter screen 18 in the collection box 16. After the stop valve 17 is closed, nitrogen is conveyed into the collection box 16 through the nitrogen delivery pipe 19 to purge the inside of the collection box 16. The pulverized coal is filtered through the filter screen 18 and conveyed to the storage space, while the sundries remain in the collection box 16. The nitrogen delivery is closed, and the manhole door 21 is opened to clean the sundries.

[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 sundry intercepting mechanism, characterized in that, It includes a heavy object interception part (2) with a mesh hole (1) and a fiber interception part (4) with a hook (3). The heavy object interception part (2) is located below the fiber interception part (4), and the height of the heavy object interception part (2) accounts for one-fifth to two-fifths of the height of the sundry interception mechanism.

2. The debris interception mechanism according to claim 1, wherein, The hook (3) is composed of two metal short sections that form an angle with each other. The ends of the two metal short sections both have gradually pointed parts, and the pointed parts are inclined upward.

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

4. The debris interception mechanism according to claim 1, wherein The distance between two horizontally adjacent hooks (3) and the distance between two vertically adjacent hooks (3) on the fiber interception part (4) are both 7 cm - 12 cm.

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

6. The debris interception mechanism according to claim 5, wherein, A plurality of bolt holes (7) are arranged in an array on the attachment ring (6).

7. A pulverized coal screw conveyor, the screw conveyor comprising a driving motor (8) and a working section (9), the working section (9) including a housing (10), multiple sections of transmission shafts (11) and screw blades (12), there are multiple bearing brackets (13) at the middle part except for the head end and the tail end, each bearing bracket (13) is provided with a bearing (14), the bearing (14) has an inner rod, flanges are provided at both ends of the inner rod, multiple sections of transmission shafts (11) are connected to the inner rod of the bearing (14) through the flanges to form a through-shaft, screw blades (12) are provided outside each section of transmission shaft (11), and there is a spacing between the end of each section of screw blade (12) and the adjacent bearing bracket (13), characterized in that, It further includes the sundry interception mechanism according to any one of claims 1 - 6. The sundry interception mechanism is limited and connected to the bearing bracket (13) or the inner wall of the housing (10). The sundry interception mechanism is located between the inner rod flange on the side of the bearing bracket (13) close to the feeding end of the housing (10) and the bearing bracket (13), and the hook (3) faces the feeding end of the housing.

8. The pulverized coal screw conveyor according to claim 7, wherein A collection box (16) adjacent to the sundry interception mechanism is provided below each sundry interception mechanism. The upper end of the collection box (16) is communicated with the housing (10). A cut-off valve (17) is provided at the upper part of the collection box (16), and there is a space between the cut-off valve (17) and the housing (10).

9. The pulverized coal screw conveyor according to claim 8, wherein A filter screen (18) is provided at the lower part of the collection box (16). A nitrogen delivery pipe (19) is communicated with the side wall of the collection box (16) between the filter screen (18) and the cut-off valve (17). The lower end of the collection box (16) is communicated with a pulverized coal storage tank (20) through a pipeline, and a manhole door (21) is provided on the side wall of the collection box (16).

10. The pulverized coal screw conveyor according to claim 7, wherein, A bearing cover (15) is provided on the housing (10) above each bearing (14).

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