Tar cleaning device for coke ovens, method for manufacturing a tar cleaning device

Abstract

To provide a tar cleaning apparatus in which the nozzle of the nozzle unit is difficult to detach from a rotor.SOLUTION: A tar cleaning apparatus 100, which is a cleaning apparatus for cleaning tar adhering to a coke oven, comprises a nozzle unit 1 having a rotor 2 that injects high-pressure water while rotating. The rotor 2 has a cylindrical rotor body part 3 and a nozzle 4 accommodated in a housing part 32 provided in the rotor body part 3. An outer peripheral step 44, which becomes smaller on the downstream side than on the upstream side, is provided on the outer peripheral surface 43 of the nozzle 4, and an engaging part 322 that engages with the outer peripheral step 44 is formed in the housing part 32.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD

[0001] The present invention relates to a tar cleaning device for a coke oven and a method for manufacturing a tar cleaning device. BACKGROUND ART

[0002] Technologies for cleaning oven doors and the like of coke ovens are known. The applicant of the present application discloses an oven door cleaning device provided with a nozzle unit that injects high-pressure water in Patent Document 1. This device includes a nozzle unit having a casing, a nozzle retainer, and a rotor. The rotor includes a cylindrical rotor main body and a tubular nozzle that reduces the diameter of the downstream end of the rotor main body. The nozzle unit discharges the high-pressure water injected into the casing through the hollow portions of the rotor and the nozzle retainer. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0003] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2014-234466 SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION

[0004] In the oven door cleaning device described in Patent Document 1, the nozzle of the nozzle unit is inserted into the rotor main body from the downstream side of the rotor main body. Furthermore, the nozzle is fixed to the rotor main body by press-fitting, adhesion, or the like. In this structure, the high-speed rotation of the rotor may cause the nozzle to slip out of the rotor main body. If the nozzle slips out, the rotor does not rotate normally and the function of the nozzle unit is impaired.

[0005] For these reasons, the oven door cleaning device described in Patent Document 1 has room for improvement from the viewpoint of making it difficult for the nozzle of the nozzle unit to slip out of the rotor main body.

[0006] This invention has been made in view of these problems, and one of its objectives is to provide a tar cleaning device for a coke oven in which the nozzle of the nozzle unit is less likely to come off the rotor. [Means for solving the problem]

[0007] To solve the above problems, a tar cleaning apparatus according to one aspect of the present invention is a cleaning apparatus for cleaning tar adhering to a coke oven, and comprises a nozzle unit having a rotor that sprays high-pressure water while rotating. The rotor has a cylindrical rotor body and a nozzle housed in a housing provided in the rotor body. The outer circumferential surface of the nozzle is provided with an outer circumferential step, the downstream side being smaller than the upstream side, and the housing has an engaging portion that engages with the outer circumferential step.

[0008] Another aspect of the present invention is a method for manufacturing a tar cleaning apparatus. This method is a method for manufacturing a tar cleaning apparatus comprising a nozzle unit that sprays high-pressure water, having a cylindrical rotor body and an outer peripheral step formed on its outer peripheral surface such that the downstream side is smaller than the upstream side, and a nozzle housed in a housing provided on the rotor body, the method comprising the steps of housing the nozzle in the housing and forming an engaging portion that engages with the outer peripheral step by plastically deforming the housing.

[0009] Furthermore, any combination of the above components, or in which the components or expressions of the present invention are mutually substituted among methods, systems, etc., are also valid embodiments of the present invention. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a tar cleaning device in which the nozzle of the nozzle unit is less likely to come off the rotor. [Brief explanation of the drawing]

[0011] [Figure 1] This figure schematically shows an example of a tar cleaning apparatus according to an embodiment. [Figure 2] This is a side cross-sectional view showing a tar cleaning apparatus according to an embodiment. [Figure 3] Figure 2 is a side cross-sectional view showing a first example of the rotor of a tar cleaning apparatus. [Figure 4] Figure 3 is a flowchart showing an example of the rotor manufacturing process. [Figure 5] This is a side cross-sectional view showing a second example of a rotor.

[0012] The present invention will be described below with reference to the drawings, based on preferred embodiments. In embodiments and modifications, the same or equivalent components and members will be denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. In addition, the dimensions of the members in each drawing will be enlarged or reduced as appropriate for ease of understanding. Furthermore, some members that are not important for explaining the embodiments will be omitted from the drawings.

[0013] Furthermore, while terms including ordinal numbers such as "first" and "second" are used to describe various components, these terms are used solely to distinguish one component from others, and do not limit the components themselves.

[0014] [Embodiment] The configuration of the tar cleaning apparatus 100 according to an embodiment of the present invention will be described below with reference to Figures 1 to 5. The tar cleaning apparatus 100 is a device for cleaning tar, coke, carbon, coal, etc. that adhere to coke ovens and their ancillary equipment. Figure 1 is a schematic diagram showing an example in which the tar cleaning apparatus 100 is applied to a furnace lid cleaning apparatus 90. Figure 2 is a side cross-sectional view showing the nozzle unit 1 of the tar cleaning apparatus 100.

[0015] For the sake of explanation, as shown in the diagram, we define an XYZ orthogonal coordinate system where a horizontal direction is the X-axis direction, a horizontal direction perpendicular to the X-axis is the Y-axis direction, and a vertical direction perpendicular to both is the Z-axis direction. The X-axis direction may also be referred to as the left-right direction, the Y-axis direction as the front-back direction, and the Z-axis direction as the up-down direction. Such directional notation does not restrict the orientation of the tar cleaning device 100, and the tar cleaning device 100 can be used in any orientation. Furthermore, "small diameter" and "large diameter" refer to the relative size relationship of the diameters of multiple circumferential surfaces.

[0016] The furnace lid cleaning device 90 is a cleaning device for removing dust, tar, and other deposits that have accumulated on the furnace lid 80, which opens and closes the opening of the carbonization chamber of a coke oven (not shown). If dust, tar, and other deposits accumulate, the airtightness when the furnace lid 80 is closed may decrease, potentially leading to gas leaks to the outside or the influx of outside air. Therefore, it is desirable that the furnace lid 80 be cleaned in a timely manner.

[0017] As shown in Figure 1, the furnace lid 80 has an insulating section 82 made of brick or the like, a lid body 84 that covers the perimeter of the furnace opening, and a knife edge 86 that contacts the lid body 84 and seals the outer circumference of the furnace opening. The lid body 84 is a wall-like portion that extends left and right and up and down. The insulating section 82 protrudes in the front-to-back direction from the left and right central region of the lid body 84. The deposits mainly accumulate on the lid body 84, the knife edge 86, and the insulating section 82.

[0018] The tar cleaning device 100 is installed in the furnace lid cleaning device 90 as a nozzle unit 1 and functions as a nozzle unit that sprays high-pressure water onto the area of ​​the furnace lid 80 to be cleaned. The nozzle unit 1 is sometimes referred to as a high-pressure water injection rotating gun. In each component, the upstream side of the high-pressure water flow is called the "upstream" or "upstream side," and the downstream side is called the "downstream" or "downstream side." The nozzle unit 1 is supplied with high-pressure water through the high-pressure water piping 66, which is pressurized water from a water tank (not shown) by a high-pressure water pump (not shown).

[0019] A furnace lid cleaning device 90 has a side cleaner including a nozzle unit 1 having a high-pressure water injection part that moves up and down along both side surfaces of a heat insulating part 82, and a support mechanism 70 that supports the nozzle unit 1. The support mechanism 70 supports a pair of left and right nozzle units 1. The nozzle unit 1 is moved up and down along the side surface of the heat insulating part 82 by the support mechanism 70. The nozzle unit 1 removes deposits in its movement range while moving. The furnace lid cleaning device 90 may include an upper surface cleaner and / or a lower surface cleaner including the nozzle unit 1 having a high-pressure water injection part that moves left and right along each of the upper and lower surfaces of the heat insulating part 82, in addition to the side cleaner.

[0020] As shown in Figure 2, the nozzle unit 1 includes a rotor 2, a casing 12, a pipe connection part 16, and a nozzle retainer 14.

[0021] The casing 12 is a hollow cylindrical member surrounding the cylindrical chamber 11, and extends along the central axis La. The casing 12 accommodates the rotor 2 in the chamber 11. The rotor 2 is a hollow pipe-shaped member rotatably accommodated in the casing 12. The pipe connection part 16 is connected to the upstream side of the casing 12 and is a part to which a high-pressure water pipe 66 is connected. The nozzle retainer 14 is an annular member provided on the downstream side of the chamber 11. The nozzle retainer 14 has a central hole 141 penetrating from the upstream side to the downstream side, and a recess 142 provided on the upstream side. The recess 142 has a mortar shape that accommodates the downstream side of the rotor 2.

[0022] In the nozzle unit 1, high-pressure water is injected into the chamber 11 from the pipe connection part 16. The rotor 2 injects high-pressure water while rotating in the chamber 11. The high-pressure water injected from the rotor 2 is discharged to the outside through the central hole of the nozzle retainer 14. As the rotor 2 rotates, the water landing point of the injected high-pressure water also rotates.

[0023] The piping connection section 16 has a single inlet 161 on the upstream side and two outlets 162 on the downstream side, and is a substantially cylindrical member overall. The two outlets 162 are configured so that the high-pressure water flowing into the chamber 11 from the outlets 162 rotates and forms a vortex. Specifically, the two outlets 162 are positioned radially offset from the central axis and 180° apart from each other in the circumferential direction. The two outlets 162 eject high-pressure water in a direction that is slightly inclined circumferentially from radially outward. As a result, the high-pressure water flowing into the chamber 11 rotates.

[0024] The rotor 2 is rotatably supported on the inner wall of the casing 12 with its rotation axis Lb tilted. The inclination angle θ of the rotation axis Lb with respect to the central axis La of the casing 12 is approximately 10° to 20° (for example, 15°). The downstream end of the rotor 2 is rotatably supported in a recess 142 of the nozzle retainer 14. As a result, the rotor 2 undergoes precession, where its rotation axis tilts and it rotates in accordance with the rotation of the high-pressure water. Consequently, the high-speed water ejected from the rotor 2 rotates so that its landing point traces a circle.

[0025] (Example 1) A first example of the rotor 2 will be described with reference to Figure 3. Figure 3 is a side cross-sectional view showing a first example of the rotor 2. Hereinafter, the direction parallel to the rotation axis Lb of the rotor 2 will be referred to as the axial direction, and the direction perpendicular to the rotation axis Lb will be referred to as the radial direction. In the first example, the rotor 2 has a rotor body 3, a nozzle 4, an inlet member 27, and an outer casing 28.

[0026] The nozzle 4 is a substantially cylindrical passage member having a central hole 45 extending in the axial direction. The nozzle 4 is a nozzle that sprays high-pressure water flowing in from the upstream end of the central hole 45 from the downstream end. The nozzle 4 is housed in a housing 32 provided in the rotor body 3. An outer peripheral step 44 is provided on the outer peripheral surface 43 of the nozzle 4, where the downstream side is smaller than the upstream side. In particular, an outer peripheral small diameter portion 41 is provided on the downstream side of the outer peripheral step 44, and an outer peripheral large diameter portion 42, which is larger in diameter than the outer peripheral small diameter portion 41, is provided on the upstream side of the outer peripheral step 44.

[0027] The rotor body 3 and nozzle 4 can be formed from various metal materials. In this embodiment, the rotor body 3 is made of stainless steel (e.g., JIS name SUS304), which is less susceptible to galvanic corrosion than aluminum, and the nozzle 4 is made of a material with higher hardness than the rotor body 3. Preferably, the nozzle 4 is made of a material with a Rockwell hardness (HRC) of 40 or higher. The nozzle 4 is made of materials such as tungsten or hardened SUS400 series. This combination of materials improves the corrosion resistance of the rotor 2 while ensuring wear resistance, thereby extending the lifespan of the rotor 2.

[0028] The rotor body 3 is a hollow cylindrical member having a hollow section extending from the upstream side to the downstream side. In this embodiment, the rotor body 3 has a housing section 32 provided on the downstream side and a cylindrical section 33 that is continuous with the upstream side of the housing section 32. A female thread is provided on the inner circumferential surface 334 on the upstream side of the cylindrical section 33. The cylindrical section 33 has a substantially cylindrical shape with a cylindrical inner circumferential surface 331 and a cylindrical outer circumferential surface 332.

[0029] The housing section 32 is the part that surrounds the cylindrical space for housing the nozzle 4. An inner step 34 is provided at the boundary between the housing section 32 and the cylindrical section 33. The inner diameter of the cylindrical section 33 upstream of the inner step 34 is smaller than the inner diameter of the housing section 32 downstream of the inner step 34. The upstream end of the nozzle 4 abuts against the inner step 34, and the inner step 34 functions as a positioning part that restricts the upstream movement of the nozzle 4.

[0030] The housing portion 32 has an engaging portion 322 that engages with the outer peripheral step 44 of the nozzle 4. The housing portion 32 has an inner circumferential surface 321 that surrounds the outer peripheral small diameter portion 41 of the nozzle 4 with a gap in between. The engaging portion 322 functions as a retaining portion that restricts the downstream movement of the nozzle 4 by engaging with the outer peripheral step 44. The engaging portion 322 in this embodiment includes a portion of the inner circumferential surface 321 that has been plastically deformed to protrude into the gap. For example, the engaging portion 322 can be formed by applying a radially inward load to the outer circumferential surface 324 of the housing portion 32 and plastically deforming it (for example, by riveting). Before the plastic deformation process, the gap between the housing portion 32 and the nozzle 4 may be 0.1 mm to 1.5 mm.

[0031] The inlet member 27 is a passage member having multiple (for example, five) inlet holes 271 on the upstream side and an outlet hole 272 on the downstream side. As an example, the inlet member 27 is made of stainless steel, similar to the rotor body 3. The outer circumferential surface 274 of the inlet member 27 is fixed to the inner circumferential surface 334 of the cylindrical portion 33. For example, the outer circumferential surface 274 may be provided with a male thread for fixing, and the inner circumferential surface 334 of the cylindrical portion 33 may be provided with a female thread, and the male thread of the outer circumferential surface 274 may be screwed into the female thread of the inner circumferential surface 334 of the cylindrical portion 33 to fix it to the rotor body 3. The inlet member 27 supplies high-speed water received through the multiple inlet holes 271 to the cylindrical portion 33 through the outlet hole 272. The male and female threads may be fine-pitch or coarse-pitch. The outer circumferential surface of the inlet member 27 may be fixed to the inner circumferential surface 334 of the cylindrical portion 33 by applying a radially inward load to the inner circumferential surface 334 of the cylindrical portion 33 to cause plastic deformation (for example, crimping), by using an adhesive, or by using a combination of these methods.

[0032] The outer casing portion 28 is a hollow cylindrical member that covers the outer circumferential surface of the rotor body portion 3. The outer casing portion 28 is a member that reduces friction with the mating member when the rotor 2 rotates and reduces wear due to friction. As an example, the outer casing portion 28 is made of a self-lubricating polyamide resin or the like. In this embodiment, the outer casing portion 28 covers the rotor body portion 3 from near the axial center to the upstream end.

[0033] The manufacturing method of rotor 2 will be explained with reference to Figures 3 and 4. Figure 4 is a flowchart of an example of the manufacturing process S110 of rotor 2. (1) An outer peripheral step 44 is formed on the outer peripheral surface 43 of the nozzle 4 (step S111). In this step, a small outer peripheral portion 41 is formed downstream of the outer peripheral step 44 on the outer peripheral surface 43 by cutting, and a large outer peripheral portion 42, which has a larger diameter than the small outer peripheral portion 41, is formed upstream of the outer peripheral step 44 on the outer peripheral surface 43.

[0034] (2) The rotor body portion 3 is formed by cutting (step S112). At this stage, the engaging portion 322 of the housing portion 32 of the rotor body portion 3 has not been formed.

[0035] (3) The nozzle 4 is housed in the housing portion 32 of the rotor body 3 (step S113). In this step, the nozzle 4 is inserted into the housing portion 32 from the downstream side. At this stage, a gap exists between the outer small diameter portion 41 and the inner circumferential surface 321 of the nozzle 4.

[0036] (4) The housing portion 32 is plastically deformed to form an engaging portion 322 that engages with the outer peripheral step 44 (step S114). In this step, a radially inward load is applied to the outer peripheral surface 324 of the housing portion 32 to plastically deform the inner peripheral surface 321 inward to form the engaging portion 322. In other words, the engaging portion 322 is formed to protrude into the gap between the outer peripheral small diameter portion 41 and the inner peripheral surface 321.

[0037] (5) Place the outer cover 28 over the rotor body 3 (step S115). In this step, place the outer cover 28 over the rotor body 3 from the upstream side.

[0038] (6) The inlet member 27 is attached to the rotor body 3 (step S116). In this step, the outer surface 274 of the inlet member 27 is fixed to the inner surface 334 of the cylindrical portion 33. As a result, the outer protruding portion 276 of the inlet member 27 comes into contact with the upstream end of the outer cover portion 28, restricting the upstream movement of the outer cover portion 28. The inner surface 334 of the cylindrical portion 33 and the outer surface 274 of the inlet member 27 may be fixed by crimping.

[0039] Each step of the manufacturing process S110 is an example, and various modifications are possible. The nozzle unit 1 is manufactured using the rotor 2 manufactured in the manufacturing process S110. Furthermore, the tar cleaning device 100 is manufactured using the manufactured nozzle unit 1.

[0040] (Second example) A second example of the rotor 2 will be described with reference to Figure 5. Figure 5 is a side cross-sectional view showing the second example of the rotor 2. In the second example, the rotor 2 has a rotor body 3, a nozzle 4, a limiting member 5, an inlet member 27, and an outer cover 28. The second example differs from the first example in that the shape of the rotor body 3 is different and it has a limiting member 5. In describing the second example, explanations that overlap with the first example will be omitted as appropriate, and the differences in configuration from the first example will be emphasized.

[0041] In the first example, the engagement portion 322 of the rotor body 3 is formed by plastic deformation after the nozzle 4 is housed, but in the second example, the inner circumferential step 327 formed when the rotor body 3 is formed by cutting is used as the engagement portion 322. On the inner circumferential surface 321 of the housing portion 32, an inner circumferential small diameter portion 325 is formed downstream of the inner circumferential step 327 (engagement portion 322), and an inner circumferential large diameter portion 326, which is larger in diameter than the inner circumferential small diameter portion 325, is formed upstream of the inner circumferential step 327 (engagement portion 322).

[0042] Furthermore, in the first example, the inner circumferential surface 331 of the cylindrical portion 33 of the rotor body 3 is smaller in diameter than the inner circumferential surface 321 of the housing portion 32, whereas in the second example, the inner circumferential surface 331 of the cylindrical portion 33 is larger in diameter than the large-diameter inner portion 326.

[0043] Therefore, in the second example, the nozzle 4 is inserted into the housing 32 from the upstream side of the rotor body 3. In addition, a limiting member 5 is provided that fits onto the inner circumferential surface 331 of the cylindrical portion 33 in order to restrict the movement of the nozzle 4 upstream.

[0044] The restricting member 5 is a hollow cylindrical member having an inner circumferential surface 51 and an outer circumferential surface 52. For example, the restricting member 5 is made of stainless steel, similar to the rotor body 3. An inner overhang 54 is provided at the downstream end of the inner circumferential surface 51, extending radially inward. The inner diameter of the inner overhang 54 is smaller than the outer diameter of the upstream end of the nozzle 4 (the outer diameter of the outer large diameter portion 42). The outer circumferential surface 52 is in radial contact with the inner circumferential surface 331, the downstream end 55 of the restricting member 5 is in axial contact with the nozzle 4, and the upstream end 57 of the restricting member 5 is in axial contact with the inlet member 27. With this configuration, the restricting member 5 restricts the upstream movement of the nozzle 4, and the inlet member 27 restricts the upstream movement of the restricting member 5.

[0045] The rotor 2 of the second example is manufactured by inserting the nozzle 4, the limiting member 5, and the outer casing 28 into the rotor body 3 in that order from the upstream direction, and then screwing the male thread portion of the outer circumferential surface 274 of the inlet member 27 into the female thread portion of the inner circumferential surface 334. As a result, the inlet member 27 restricts the upstream movement of the limiting member 5 and the outer casing 28, and the limiting member 5 restricts the upstream movement of the nozzle 4. In addition, the inner circumferential step 327 (engaging portion 322) of the rotor body 3 engages with the outer circumferential step 44 of the nozzle 4, thereby restricting the downstream movement of the nozzle 4. The rotor 2 of the second example manufactured in this way is incorporated into the nozzle unit 1, and the tar cleaning device 100 is manufactured using the nozzle unit 1.

[0046] The features of the tar cleaning apparatus 100 of the embodiment will now be described. The tar cleaning apparatus 100 of the embodiment is a cleaning apparatus for cleaning tar adhering to a coke oven, and includes a nozzle unit 1 having a rotor 2 that sprays high-pressure water while rotating. The rotor 2 has a cylindrical rotor body 3 and a nozzle 4 housed in a housing 32 provided in the rotor body 3. An outer peripheral step 44 is provided on the outer peripheral surface 43 of the nozzle 4, with the downstream side being smaller than the upstream side, and an engaging portion 322 that engages with the outer peripheral step 44 is formed in the housing 32.

[0047] With this configuration, the engaging portion 322 engages with the outer peripheral step 44, making it difficult for the nozzle 4 of the nozzle unit 1 to come off the rotor body 3 even when the rotor 2 rotates. Therefore, the possibility of the nozzle 4 coming off and impairing the function of the nozzle unit 1 can be reduced.

[0048] As an example, the outer circumferential surface 43 of the nozzle 4 is provided with an outer circumferential small-diameter portion 41 downstream of the outer circumferential step 44, and an outer circumferential large-diameter portion 42, which is larger in diameter than the outer circumferential step 41, is provided upstream of the outer circumferential step 44. In this case, since the outer circumferential step 44 is formed over a wide area in the circumferential direction, the amount of engagement between the engaging portion 322 and the outer circumferential step 44 increases, making it even more difficult for the nozzle 4 to come off the rotor body 3.

[0049] For example, the housing portion 32 has an inner circumferential surface 321 that surrounds the outer small diameter portion 41, and the engaging portion 322 includes a portion that has been plastically deformed so that the inner circumferential surface 321 protrudes inward. In this case, the engaging portion 322 can be formed by plastic deformation such as crimping, which improves the ease of assembly of the rotor 2.

[0050] As an example, the housing portion 32 has an inner circumferential surface 321 that surrounds the outer small diameter portion 41 with a gap in between, and the engaging portion 322 includes a portion of the inner circumferential surface 321 that has been plastically deformed to protrude into the gap. In this case, because the engaging portion 322 protrudes into the gap, the amount of plastic deformation increases, the amount of engagement between the engaging portion 322 and the outer step 44 increases, and the nozzle 4 becomes even more difficult to remove.

[0051] As an example, the engaging portion 322 is an inner circumferential step 327 formed on the inner circumferential surface 321 of the housing portion 32. The inner circumferential surface 321 is provided with an inner circumferential small diameter portion 325 downstream of the inner circumferential step 327, and an inner circumferential large diameter portion 326, which is larger in diameter than the inner circumferential small diameter portion 325, is provided upstream of the inner circumferential step 327. In this case, since the engaging portion 322 is formed over a wide area in the circumferential direction, the amount of engagement between the engaging portion 322 and the outer circumferential step 44 increases, making it even more difficult for the nozzle 4 to come loose. Furthermore, since plastic deformation is not used, the nozzle 4 is hardly affected by plastic deformation.

[0052] As an example, the rotor body 3 has a cylindrical portion 33 with a larger diameter than the inner large-diameter portion 326, which is continuous with the upstream side of the housing portion 32. The cylindrical portion 33 is provided with a limiting member 5 that fits into the cylindrical portion 33 and restricts the upstream movement of the nozzle 4. In this case, the nozzle 4 can be prevented from coming out to the upstream side with a simple configuration.

[0053] For example, the rotor body 3 is made of stainless steel, and the nozzle 4 is made of a material with higher hardness than the rotor body 3. In this case, galvanic corrosion of the rotor body 3 can be reduced while improving the wear resistance of the nozzle 4.

[0054] The above describes in detail some examples of embodiments of the present invention. Each of the embodiments described above is merely a concrete example of how to implement the present invention. The content of each embodiment does not limit the technical scope of the present invention, and many design changes, such as changes, additions, and deletions of components, are possible as long as they do not depart from the spirit of the invention as defined in the claims. In the embodiments described above, the content in which such design changes are possible is described with notations such as "of the embodiment" or "in the embodiment," but this does not mean that design changes are not permitted for content without such notations. Furthermore, the hatching applied to the cross-section in the drawings does not limit the material to which the hatching is applied.

[0055] The following describes modified examples. In the drawings and descriptions of modified examples, components and parts that are the same as or equivalent to those in the embodiments are denoted by the same reference numerals. Descriptions that overlap with those in the embodiments will be omitted as appropriate, and the descriptions will focus on the configurations that differ from those in the embodiments.

[0056] (modified version) In the above description, the first example showed a case in which the nozzle 4 is fixed by an engaging portion 322 formed by plastic deformation, but the explanation is not limited to this. For example, an adhesive may be applied near the engaging portion 322 formed by plastic deformation.

[0057] The above description shows an example in which the outer covering 28 is formed from a polyamide resin, but it is not limited to this. The outer covering can be formed from a variety of known resins such as polyacetal resin, polybutylene resin, and polyimide resin.

[0058] In the above description, the tar cleaning device 100 was shown as an example of a device for cleaning the furnace lid, but the tar cleaning device is not limited to this. The tar cleaning device can also be applied to cleaning tar and other substances adhering to tar pan cleaners and small lids, which are ancillary equipment of coke ovens.

[0059] Each of the above-described modifications produces the same functions and effects as the embodiments.

[0060] Any combination of the components and modifications of the embodiments described above is also useful as an embodiment of the present invention. The new embodiments resulting from these combinations possess the combined effects of both the combined embodiments and the modifications. [Explanation of symbols]

[0061] 100 Tar cleaning device, 1 Nozzle unit, 2 Rotor, 3 Rotor body, 4 Nozzle, 5 Restricting member, 12 Casing, 27 Inlet member, 28 Outer cover, 32 Housing section, 33 Cylindrical section, 34 Inner step, 41 Outer small diameter section, 42 Outer large diameter section, 43 Outer surface, 44 Outer step, 322 Engaging section, 327 Inner step.

Claims

1. A cleaning device for cleaning tar adhering to a coke oven, comprising a nozzle unit having a rotor that sprays high-pressure water while rotating, The rotor comprises a cylindrical rotor body, a nozzle housed in a housing provided in the rotor body, and an outer cover made of a self-lubricating material that covers at least a portion of the outer circumferential surface of the rotor body. The outer surface of the nozzle is provided with an outer circumferential step, the downstream side being smaller than the upstream side. A tar cleaning device in which an engaging portion is formed in the housing portion that engages with the outer peripheral step.

2. The tar cleaning apparatus according to claim 1, wherein the outer surface of the nozzle is provided with a small outer diameter portion downstream of the outer peripheral step and a large outer diameter portion having a larger diameter than the small outer diameter portion upstream of the outer peripheral step.

3. The housing portion has an inner circumferential surface that surrounds the outer small diameter portion, The tar cleaning apparatus according to claim 2, wherein the engaging portion includes a portion that has been plastically deformed so as to protrude inward from the inner circumferential surface.

4. The housing portion has an inner circumferential surface that surrounds the outer small diameter portion with a gap in between, The tar cleaning apparatus according to claim 2, wherein the engaging portion includes a portion whose inner circumferential surface is plastically deformed so as to protrude into the gap.

5. The engagement portion is an inner circumferential step formed on the inner circumferential surface of the housing portion. The tar cleaning apparatus according to claim 2, wherein the inner circumferential surface is provided with a small-diameter inner circumferential portion downstream of the inner circumferential step and with a large-diameter inner circumferential portion having a larger diameter than the small-diameter inner circumferential portion upstream of the inner circumferential step.

6. The rotor body portion has a cylindrical portion with a larger diameter than the inner circumferential large diameter portion, which is continuous with the upstream side of the housing portion. The tar cleaning apparatus according to claim 5, wherein the cylindrical portion is provided with a limiting member that fits into the cylindrical portion and restricts the upstream movement of the nozzle.

7. The tar cleaning apparatus according to claim 1, wherein the rotor body is made of stainless steel and the nozzle is made of a material with higher hardness than the rotor body.

8. A method for manufacturing a tar cleaning apparatus comprising a nozzle unit for spraying high-pressure water, the nozzle having a cylindrical rotor body, an outer peripheral step formed on its outer peripheral surface where the downstream side is smaller than the upstream side, a nozzle housed in a housing provided on the rotor body, and an outer cover made of a self-lubricating material that covers at least a part of the outer peripheral surface of the rotor body, the method for manufacturing a tar cleaning apparatus, The steps include housing the nozzle in the aforementioned housing section, The steps include: plastically deforming the housing portion to form an engaging portion that engages with the outer peripheral step; The steps include placing the outer cover over the rotor body, A method for manufacturing a tar cleaning apparatus that includes [a specific component].

Images