Mud scraping tooth rake structure of multi-hearth incinerator

Abstract

The mud scraping tooth rake structure of the multi-hearth incinerator comprises a rocker arm, the rocker arm is provided with a main body, the extending direction of the main body serves as the first direction, a guide rail plate extending in the first direction is fixedly arranged on one side of the main body, and a plurality of rake tooth units are sequentially installed on the guide rail plate in the first direction; a stop baffle used for limiting the rake tooth units from sliding along the guide rail plate is fixedly arranged at one end, in the first direction, of the guide rail plate, and a stop spacer bush is installed at the other end, in the first direction, of the guide rail plate and used for extruding the rake tooth units on the guide rail plate so that the rake tooth units on the guide rail plate can be mutually extruded and fixed. The guide rail plate is arranged, the rake tooth units are detachably installed on the guide rail plate, the rake teeth and the rocker arm are designed to be of an assembly structure, when the tooth plate of one rake tooth unit is damaged, only the rake tooth unit needs to be replaced independently, the rake tooth structure is simple, fast and efficient, and the repair and maintenance cost and difficulty are reduced.

Description

Technical Field

[0001] This application relates to the technical field of rake structures for multi-hearth incinerators, and in particular to a sludge scraping rake structure for a multi-hearth incinerator. Background Art

[0002] Sludge is a by-product of sewage treatment and contains a large amount of harmful substances. Sludge incineration is to oxidize and decompose the organic matter in sludge into carbon dioxide and water at high temperatures, while recovering heat energy, which can achieve the harmless treatment and resource utilization of sludge and is the most important current method for heat treatment and utilization of sludge. Municipal sludge contains a large amount of organic matter and a certain amount of cellulose and lignin, and has a certain calorific value. Incineration treatment is to make the combustible components in the sludge undergo a violent chemical reaction with oxygen in the air at high temperatures, convert the organic matter into harmless substances such as water and carbon dioxide, and release energy at the same time, generating solid residues. If the heat is recovered and utilized, the purpose of comprehensive utilization of waste can be achieved. At the same time, incineration treatment also has the characteristics of high organic matter removal rate (more than 99%) and wide adaptability, so it has been widely used in developed countries.

[0003] Among sludge incineration equipment, the multi-hearth incinerator (MIF) is the most widely used main furnace type. The multi-hearth incinerator is also called a vertical multi-stage incinerator, which is a vertical cylindrical steel device lined with refractory materials, referring to the structure of the vertical multi-stage incinerator recorded in CN210291897U. Generally, there are many horizontal hearths made of refractory materials inside the multi-hearth incinerator. A series of horizontal adiabatic hearths are arranged from top to bottom and stacked layer by layer. A single multi-hearth incinerator can contain 4 to 14 hearths. There is a rotatable central shaft from the bottom to the top of the furnace. Each layer of hearth has rotating rakes extending radially and fixedly connected to the central shaft. Generally, the upper and lower hearths are provided with four rakes, and the middle-layer hearths are provided with two rakes. The dewatered mud cake enters the furnace from the outside of the top hearth, relies on the rakes to turn and move towards the center and enters the lower layer through the hole in the center, and the sludge entering the lower layer moves towards the outside and enters the next lower layer through the hole on the outside of this layer, and so on, so that the sludge moves downward in a spiral path from top to bottom.

[0004] At present, the sludge scraping rake structure of the vertical multi-stage incinerator is mostly an integral casting or welding structure. When a single tooth is damaged, the entire sludge scraping rake needs to be replaced, resulting in high costs. Summary of the Utility Model

[0005] The embodiments of this application provide a sludge scraping rake structure for a multi-hearth incinerator to reduce the cost and difficulty of maintenance and repair.

[0006] In order to achieve the above application purpose, the present application provides a sludge scraping tooth rake structure for a multi-hearth incinerator, which includes a rocker arm. The rocker arm has a main body. Taking the extending direction of the main body as the first direction, a guide rail plate extending along the first direction is fixedly arranged on one side of the main body. The guide rail plate has a first edge and a second edge parallel to the first direction. A plurality of rake tooth units are sequentially installed on the guide rail plate along the first direction. The rake tooth unit includes a base body and a tooth plate arranged on the outer side of the base body. The upper edge and the lower edge on the inner side of the base body are respectively provided with guide grooves that cooperate with the first edge and the second edge of the guide rail plate. The rake tooth unit is slidably installed on the guide rail plate through the guide grooves. A stop baffle for restricting the sliding of the rake tooth unit along the guide rail plate is fixedly arranged at one end of the guide rail plate in the first direction. A stop spacer is installed at the other end of the guide rail plate in the first direction. The stop spacer is used to squeeze the rake tooth units on the guide rail plate so that the rake tooth units on the guide rail plate are mutually squeezed and fixed. The stop spacer is fixedly connected to the guide rail plate through a locking pin shaft.

[0007] Optionally, the main body is in the shape of a hollow tube, and its axis extends along the first direction. One end of the main body is open and the other end is sealed. The inner tube extends into the inner cavity of the main body from the open end of the main body and is fixedly connected to the main body. The inner tube is a hollow tube with both ends open. There is an end gap between the end of the inner tube extending into the main body and the inner wall of the end of the sealed end of the main body. A sandwich layer is formed between the cylindrical outer wall of the inner tube and the cylindrical inner wall of the main body. The outer edge of one end of the inner tube close to the open end of the main body has a retaining ring extending radially outward. The retaining ring closes the sandwich layer. An exhaust hole communicating with the sandwich layer is provided on the side wall of the main body close to the open end.

[0008] Optionally, the tooth plate of the rake tooth unit installed on the guide rail plate is perpendicular to the guide rail plate.

[0009] Optionally, the tooth plates of the rake tooth units installed on the guide rail plate are parallel to each other. Further optionally, the included angle between the tooth plate of each rake tooth unit installed on the guide rail plate and the first direction is an acute angle, or the included angle between the tooth plate of each rake tooth unit installed on the guide rail plate and the first direction is an obtuse angle. Furthermore, for different layers of the furnace, under the condition that other parts are the same, only by replacing the rake tooth unit with an obtuse or acute included angle between the tooth plate and the first direction of the selected rake tooth unit, the sludge can move outward or inward simultaneously under the drive of the central axis, improving the production efficiency of the sludge scraping tooth rake.

[0010] Optionally, the inner tube is welded to the inner wall of the main body through a connecting piece.

[0011] Preferably, the outer end face of the retaining ring of the inner tube is flush with the end face of this end of the main body.

[0012] Optionally, one or more exhaust holes are provided on the main body. Further optionally, when a plurality of exhaust holes are provided on the main body, the exhaust holes are evenly spaced along the circumferential direction of the main body.

[0013] One or more technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0014] During use, the rocker arm is arranged in the furnace of the multi-hearth incinerator and extends radially. One end of it is connected to the central axis of the multi-hearth incinerator. Driven by the rotation of the central axis, the materials in the furnace are stirred. By setting the guide rail plate and detachably installing the rake tooth unit on the guide rail plate, the rake teeth and the rocker arm are designed as an assembly structure. When the tooth plate of a certain rake tooth unit is damaged, only this rake tooth unit needs to be replaced separately, which is simple, fast and efficient, and reduces the maintenance and repair costs and difficulties.

[0015] One end of the rocker arm set as an opening is connected to the central axis. At the same time, the inner pipe communicates with the cold air pipeline of the central axis. Cold air flows in from the inner hole of the inner pipe, enters the interlayer from the end gap, and finally discharges from the exhaust hole. During the flow of the cold air, the rocker arm is cooled. At the same time, the gas that has absorbed heat and discharges from the exhaust hole can also play a role in heating and drying the upper-layer sludge, and the cooled cold air can return to the lower-layer furnace to provide oxygen for combustion assistance in the combustion chamber. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a schematic diagram of the cooperation structure of the rake tooth unit and the guide rail plate;

[0018] Figure 3 is a schematic structural diagram of the rake tooth unit;

[0019] Figure 4 is a schematic structural diagram of the inner pipe;

[0020] Figure 5 is a schematic diagram of the assembly structure of the rocker arm and the inner pipe.

[0021] Marks in the drawings and corresponding component names: 1 - rocker arm, 11 - exhaust hole, 2 - inner pipe, 21 - retaining ring, 3 - guide rail plate, 31 - stop baffle, 4 - rake tooth unit, 41 - base body, 42 - rake tooth unit, 5 - stop spacer, 51 - locking pin shaft. Detailed Embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0023] Such as Figure 1, Figure 2 As shown in the figure, an embodiment of the present application provides a sludge scraping tooth rake structure for a multi-hearth incinerator, which includes a rocker arm 1. The rocker arm 1 has a main body. Taking the extension direction of the main body as the first direction, a guide rail plate 3 extending along the first direction is fixedly arranged on one side of the main body. The guide rail plate 3 has a first edge and a second edge parallel to the first direction. A plurality of rake tooth units 4 are sequentially installed on the guide rail plate 3 along the first direction, as Figure 3 shown. The rake tooth unit 4 includes a base body 41 and a tooth plate 42 arranged on the outer side of the base body 41. Guide grooves are respectively arranged on the upper edge and the lower edge of the inner side of the base body 41 and are matched with the first edge and the second edge of the guide rail plate 3. The rake tooth unit is slidably installed on the guide rail plate through the guide grooves. Under the sliding fit between the guide grooves and the edges of the guide rail plate, the rake tooth unit can slide along the guide rail plate. A stop baffle 31 for restricting the rake tooth unit 4 from sliding along the guide rail plate 3 is fixedly arranged at one end of the guide rail plate 3 in the first direction. A stop spacer 5 is installed at the other end of the guide rail plate 3 in the first direction. The stop spacer 5 is used to squeeze the rake tooth units 4 on the guide rail plate 3 so that the rake tooth units 4 on the guide rail plate 3 are mutually squeezed and fixed. The stop spacer 5 is fixedly connected with the guide rail plate 3 through a locking pin shaft 51.

[0024] During use, the rocker arm 1 is arranged in the furnace chamber of the multi-hearth incinerator and extends radially. One end of it is connected to the central axis of the multi-hearth incinerator. Driven by the rotation of the central axis, the materials in the furnace chamber are stirred. By setting the guide rail plate 3 and detachably installing the rake tooth unit 4 on the guide rail plate 3, the rake teeth and the rocker arm 1 are designed as an assembly structure. When the tooth plate 42 of a certain rake tooth unit 4 is damaged, only this rake tooth unit 4 needs to be replaced separately, which is simple, fast and efficient, and reduces the maintenance and repair costs and difficulties.

[0025] Optionally, as shown in Figure 4 , Figure 5 the figure, the main body is in a hollow tube shape, its axis extends along the first direction, one end of the main body is open and the other end is sealed. The inner tube 2 extends into the inner cavity of the main body from the open end of the main body and is fixedly connected with the main body. The inner tube 2 is a hollow tube with both ends open. There is an end gap between the end of the inner tube 2 extending into the main body and the inner wall of the sealed end of the main body. A sandwich is formed between the cylindrical outer wall of the inner tube 2 and the cylindrical inner wall of the main body. An outer ring 21 extending radially outward is arranged on the outer edge of the end of the inner tube 2 close to the open end of the main body. The outer ring 21 closes the sandwich. An exhaust hole 11 communicating with the sandwich is arranged on the side wall of the main body close to the open end.

[0026] In use, one end of the rocker arm 1 that is set to be open is connected to the central axis. At the same time, the inner tube 2 is connected to the cold air duct of the central axis. Cold air flows into the inner hole of the inner tube 2, enters the interlayer through the end gap, and finally is discharged from the exhaust hole 11. During the flow of the cold air, the rocker arm 1 is cooled. At the same time, the gas that has absorbed heat and is discharged from the exhaust hole 11 can also heat and dry the upper-layer sludge, and the cooled cold air can return to the lower furnace to provide oxygen for combustion support in the combustion chamber.

[0027] Optionally, the tooth plate 42 of the rake tooth unit 4 installed on the guide rail plate 3 is perpendicular to the guide rail plate 3.

[0028] Optionally, the tooth plates 42 of the respective rake tooth units 4 installed on the guide rail plate 3 are parallel to each other.

[0029] Further optionally, the angle between the tooth plate 42 of the rake tooth unit 4 installed on the guide rail plate 3 and the first direction is an acute angle, or the angles between the tooth plates 42 of the respective rake tooth units 4 installed on the guide rail plate 3 and the first direction are obtuse angles. Furthermore, rakes with acute angles and rakes with obtuse angles can be set in different layers of the furnace, and the sludge can be moved outward or inward simultaneously under the drive of the central axis, improving the production efficiency of the rake.

[0030] Optionally, the inner tube 2 is welded to the inner wall of the main body through a connecting piece.

[0031] Preferably, the outer end face of the retaining ring 21 of the inner tube 2 is flush with the end face of this end of the main body.

[0032] Optionally, one or more exhaust holes 11 are provided on the main body. Further optionally, when multiple exhaust holes 11 are provided on the main body, the exhaust holes 11 are evenly spaced along the circumferential direction of the main body.

[0033] Preferably, all components of the rake structure are made of high-strength heat-resistant steel.

[0034] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" or "including" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The use of the words first, second, and third, etc. does not denote any order, and these words can be interpreted as names.

[0035] All features disclosed in this specification, except for mutually exclusive features, can be combined in any way.

[0036] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless specifically recited, may be replaced by other equivalent or alternative features with a similar purpose. That is, unless specifically recited, each feature is only an example of a series of equivalent or similar features.

[0037] This application is not limited to the specific embodiments described above. This application extends to any new feature or any new combination disclosed in this specification, as well as to any step of any new method or process disclosed or any new combination.

Claims

1. A scraper tooth rake structure for a multi-chamber incinerator, characterized in that: The rocker arm includes a main body, with the extension direction of the main body as the first direction, a guide rail plate extending along the first direction is fixedly arranged on one side of the main body, the guide rail plate has a first edge and a second edge parallel to the first direction, and a plurality of rake tooth units are sequentially installed on the guide rail plate along the first direction, the rake tooth unit includes a base and a tooth plate arranged on the outside of the base, the upper edge and the lower edge of the inner side of the base are respectively provided with guide grooves matching the first edge and the second edge of the guide rail plate, the rake tooth unit is slidably installed on the guide rail plate through the guide groove, a stop baffle for limiting the sliding of the rake tooth unit along the guide rail plate is fixedly arranged at one end of the guide rail plate in the first direction, a stop spacer is installed at the other end of the guide rail plate in the first direction, the stop spacer is used to squeeze the rake tooth unit on the guide rail plate so that each rake tooth unit on the guide rail plate is squeezed and fixed to each other, and the stop spacer is fixedly connected to the guide rail plate through a locking pin.

2. The scraper tooth rake structure of a multi-chamber incinerator according to claim 1, characterized in that: The main body is in the form of a hollow tube, with its axis extending along a first direction. One end of the main body is open and the other end is sealed. The inner tube extends from the open end of the main body into the inner cavity of the main body and is fixedly connected to the main body. The inner tube is a hollow tube with openings at both ends. There is an end gap between the end of the inner tube extending into the interior of the main body and the inner wall of the end of the sealed end of the main body. A sandwich is formed between the cylindrical outer wall of the inner tube and the cylindrical inner wall of the main body. The outer edge of the end of the inner tube close to the open end of the main body has a retaining ring extending radially outward, and the retaining ring closes the sandwich. An exhaust hole connected to the sandwich is provided on the side wall of the main body close to the open end.

3. The scraper tooth rake structure of a multi-chamber incinerator according to claim 1, characterized in that: The tooth plate of the rake tooth unit installed on the guide rail plate is perpendicular to the guide rail plate.

4. The scraper tooth rake structure of a multi-chamber incinerator as claimed in claim 3, characterized in that: The tooth plates of each rake tooth unit installed on the guide rail plate are parallel to each other.

5. The scraper tooth rake structure of a multi-chamber incinerator as claimed in claim 4, characterized in that: The included angle between the tooth plate of each rake tooth unit installed on the guide rail plate and the first direction is an acute angle, or the included angle between the tooth plate of each rake tooth unit installed on the guide rail plate and the first direction is an obtuse angle.

6. The scraper tooth rake structure of a multi-chamber incinerator as claimed in claim 2, characterized in that: The inner tube is connected to the inner wall of the main body by welding through a connecting piece.

7. The scraper tooth rake structure of a multi-chamber incinerator as claimed in claim 2, characterized in that: The outer end surface of the retaining ring of the inner tube is flush with the end surface of the end of the main body.

8. The scraper tooth rake structure of a multi-chamber incinerator as claimed in claim 2, characterized in that: One or more exhaust holes are arranged on the main body.

9. The scraper tooth rake structure of a multi-chamber incinerator as claimed in claim 8, characterized in that: The main body is provided with a plurality of exhaust holes, which are evenly spaced along the circumference of the main body.

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