Roller assembly for supporting lance tube of soot blower

Abstract

One embodiment of the present invention comprises: a cylindrical roller center axis (100); a roller member (200) arranged concentrically with respect to the roller center axis (100); a plurality of bearing members (300) arranged between the roller center axis (100) and the roller member (200); a U-shaped bracket (400) including a support member fixed to a lance tube support rack and a pair of leg members (430) extending to the upper ends of both sides of the support member and penetratingly coupled to one end and the other end of the roller center axis (100), respectively; and a cover member (500) including a shell member that makes surface contact with at least a portion of the bracket (400) from the outside and a core member that makes surface contact with the entire end of the roller center axis (100) from the outside, in order to tighten and combine the bracket (400) and the roller center axis (100) in the axial direction. A roller assembly for supporting a lance tube of a smelter and a smelter including the same are provided, characterized by including a bolt (600) that penetrates from the outer side of the core portion of the cover member (500) to at least a portion of the inner side of the roller center axis (100) in order to tighten and combine the cover member, the bracket (400), and the roller center axis (100) in the axial direction.

Description

Technology Field

[0001] The present invention relates to a roller assembly for supporting a soot lance tube, and more specifically, to a roller assembly installed at the top of a soot lance adjacent to a boiler water wall to prevent bending of the lance tube and to support reciprocating and rotational motion. Background Technology

[0002] Generally, a soot blower is equipment that removes impurities, such as soot, from boiler tubes using high-pressure air or steam.

[0003] For example, in the case of coal-fueled thermal power plants, soot generated during the combustion of pulverized coal adheres to the surface of the tubes forming the water-tube boiler, reducing the tubes' thermal conductivity; therefore, the soot is regularly removed using multiple lance tubes installed on the sides of the boiler.

[0004] Referring to FIG. 1a, when the milling machine is in a stationary state, a feed tube (not shown) is superimposed inside a lance tube (30).

[0005] During operation, the lance tube (30) is reciprocated and rotated in the forward and backward directions by means of a carriage (not shown) provided at the rear end of the lance tube (30), thereby configuring the lance tube (30) to be repeatedly inserted and withdrawn from the boiler water-cooled wall to the tube inside the furnace.

[0006] The tip head of the lance tube (30) that is inserted into / extracted from the boiler (furnace) has a plurality of injection holes (not shown) capable of radially spraying high-pressure steam, so that soot and ash adhering to the tube (not shown) inside the boiler furnace can be removed with high-pressure air or steam.

[0007] Referring to FIG. 1b, meanwhile, a lance tube support rack (50) is provided as a support to prevent bending and twisting deformation of the lance tube while it moves back and forth inside / outside the boiler, thereby preventing eccentricity. In order to reduce friction caused by contact with the lance tube and to distribute the load, a plurality of roller assemblies (10) are installed, with one side bracket attached to the lance tube support rack (50) and the other side roller member in direct line contact with the lance tube.

[0008] Meanwhile, as illustrated in FIG. 1c, the conventional roller assembly has a shape in which both ends of the axial reference roller center axis (100') penetrate the bracket (400') and partially protrude outward, and is equipped with a snap ring (800') that fixes the roller center axis so that it does not deviate in the axial direction. However, the conventional roller assembly has a problem in which the roller center axis deviates due to the circumferential rotational force, gravity load, and random vibration applied by the lance tube, causing the connecting part of the bracket (400') penetrating the roller center axis (100') to wear radially in the lower left and right regions (see red arrow in FIG. 1c). When the roller center axis deviates radially, the axial alignment of the roller center axis may be misaligned with respect to the reciprocating movement and rotation of the lance tube. Consequently, the load of the lance tube is not evenly distributed and friction increases, leading to accelerated wear and reduced lifespan of the roller assembly, and subsequently, bending of the lance tube may occur.

[0009] Prior art document 1 (Registered Patent Publication No. 10-1727834) relates to a support roller (21) that supports the middle section of a lance tube (10) of a milling machine, but does not provide a specific mention of a device configuration (bracket, snap ring, etc.) that fixes the axial reference rotation axis (21a) in vertical and horizontal directions, and thus does not mention or provide a solution to the problem of accelerated wear and reduced lifespan of the roller assembly described above.

[0010] Prior art document 2 (Published Patent Application No. 10-2014-0123673) relates to a roller assembly device for a continuous casting machine segment, and it can be seen that it is prior art in that it adopts a structure in which a rotating shaft is supported in a form that penetrates both sides of a frame and partially protrudes outward, and a structure in which both ends of the rotating shaft are finished with snap rings.

[0011] Prior art document 3 (Japanese Registered Patent Publication No. 5396736) relates to a support structure for a roller member and adopts a device configuration of the prior art similar to Prior Art document 2 in that it has a structure in which a rotating shaft is supported in a partially protruding form by penetrating both sides of a detachment prevention member and uses an E-ring to prevent axial detachment of both ends of the rotating shaft. The problem to be solved

[0012] The object of the present invention is to provide a novel lance tube support roller assembly installed on the upper side adjacent to the boiler side to prevent bending of the lance tube and to support reciprocating movement.

[0013] In addition, the present invention aims to improve the problem of causing radial wear on fixing devices, such as brackets, through which the roller center axis passes when the roller center axis protrudes outside the bracket and the circumferential rotational force applied by the lance tube, the load in the direction of gravity, and the force due to random vibration are transmitted through the roller center axis.

[0014] In the present invention, an optimized ratio between the core area and the shell area of ​​the cover member is provided to integrate the cover member and the bracket in the axial direction with respect to the roller center axis, and an optimized ratio between the length of the center of the roller center axis and the length of the bolt is provided to integrate the cover member and the bracket in the radial direction with respect to the roller center axis. means of solving the problem

[0015] One embodiment of the present invention comprises: a cylindrical roller center axis (100); a roller member (200) arranged concentrically with respect to the roller center axis (100); a plurality of bearing members (300) arranged between the roller center axis (100) and the roller member (200); a U-shaped bracket (400) including a support member (410) fixed to a lance tube support rack, and a pair of leg members (430) extending to the upper ends of both sides of the support member and penetratingly coupled to one end and the other end of the roller center axis (100), respectively; and a cover member (500) including a shell member (530) in surface contact with at least a portion of the bracket (400) from the outside and a core member (510) in surface contact with the entire end of the roller center axis (100) from the outside, in order to tighten and combine the bracket (400) and the roller center axis (100) in the axial direction. A roller assembly for supporting a lance tube for a maker is provided, comprising: a bolt (600) that penetrates from the outer side of the core portion (510) of the cover member to at least a portion of the inner side of the roller center axis (100) in order to tighten and combine the cover member (500), the bracket (400), and the roller center axis (100) in the axial direction.

[0016] The roller center axis (100) is formed by having a center (110) in which the bearing member (300) is located in the axial direction; and a pair of side portions (130) located on both sides of the center in the axial direction, and the pair of side portions (130) of the roller center axis are each connected by penetrating the bracket (400), and may be arranged so as to substantially coincide with the outer surface of the leg portion (430) of the bracket in the axial direction.

[0017] The above cover member (500) may have a ratio (R2 / R1) of the radius (R2) of the shell part (530) to the radius (R1) of the core part (510) of 0.2 to 0.3.

[0018] The side portion (130) of the roller center axis is formed continuously from the outer side in the axial direction to at least a portion of the interior and includes a bolt hole (131) into which the bolt (600) is fastened, and the ratio (L3 / L1) of the length (L1) of the bolt (600) to the length (L3) of the center (110) of the roller center axis may be 0.4 to 0.7.

[0019] It may further include a plurality of collar members (700) arranged concentrically with respect to the roller center axis (100) and located on both sides of the bearing in the axial direction; and a plurality of snap rings (800) arranged concentrically with respect to the roller center axis (100) and located on the outer side of the bearing located on the outermost side in the axial direction. Effects of the invention

[0020] According to the present invention, a fixing part (13) is configured such that a bracket (400); a cover member (500); and a bolt (600) are integrally connected in the axial direction through a bolt (600) that penetrates from the outer side of the cover member to at least a portion of the inner side of the roller center axis. Since the roller center axis penetrates the bracket with respect to the axial direction but does not protrude outward, the cover member can press the roller center axis and the bracket only in the axial direction and apply pressure only in a single direction (axial direction), and since no friction occurs in the radial direction, the problem of the cover member and the bracket wearing out in the radial direction can be improved.

[0021] According to the present invention, when the radius ratio (R2 / R1) of the core part and the shell part of the cover member satisfies the design range, the problem of excessive force being distributed to the shell part by the axially inward tightening force by the cover member can be improved, and the cover member and the bracket can be integrated axially with respect to the roller center axis.

[0022] In addition, according to the present invention, when the ratio (L3 / L1) of the length of the bolt (600) to the length of the center of the roller center axis (110) satisfies the design range, the load, rotational force, and vibration of the lance tube through the bearing member and the roller member are not excessive, and the durability of the roller assembly is improved during long-term use, thereby improving the problem of radial wear in the area where the bracket and the roller center axis come into contact. Brief explanation of the drawing

[0023] Figure 1a is a photograph showing a milling machine connected to a roller assembly for supporting the milling machine lance tube. Figure 1b shows a schematic cross-sectional view of the shaving machine of Figure 1a based on the radial direction. FIG. 1c is a photograph of a roller assembly separated after its lifespan has ended, showing a side view of a conventional roller assembly in which both ends of the axial reference roller center axis (100') pass through the bracket (400') and partially protrude outward. FIG. 2 is a schematic cross-sectional view of a roller assembly for supporting a lance tube of a milling machine according to one embodiment of the present invention, viewed from the front. FIG. 3 is a schematic cross-sectional view of a U-shaped bracket according to one embodiment of the present invention ((a) front, (b) side, (c) bottom). FIG. 4 is a side schematic diagram of a cover member according to one embodiment of the present invention. FIG. 5a is a drawing showing the load distributed to a pair of roller assemblies, each positioned at the lower left and lower right, of a lance tube using a roller assembly according to one embodiment of the present invention, and FIG. 5b is a drawing of a lance tube using a conventional roller assembly according to FIG. 5a. Specific details for implementing the invention

[0024] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0025] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning that is commonly understood by those skilled in the art to which the present invention belongs.

[0026] When a part of a specification is described as "comprising" a certain component, unless specifically stated otherwise, this means that it does not exclude other components but may include additional components. Furthermore, the singular form includes the plural form unless specifically stated otherwise in the text.

[0027] Additionally, when a part such as a layer, film, region, section, plate, etc. is described in this specification as being “on” or “on” another part, this includes not only cases where it is “immediately on” another part, but also cases where there is another part in between.

[0029] One embodiment of the present invention provides a roller assembly for supporting a lance tube of a smelter. FIG. 2 is a schematic cross-sectional view of the roller assembly for supporting a lance tube of a smelter viewed from the front. Referring to FIG. 2, the roller assembly (10) includes a roller center axis (100); a roller member (200); a bearing member (300); a bracket (400); a cover member (500); and a bolt (600).

[0030] The roller assembly (10) may comprise a rotating part (11) in which a roller member (200) and a bearing member (300) are integrally connected in a radial direction with respect to the roller center axis (100). On the other hand, it may comprise a fixed part (13) in which a bracket (400), a cover member (500), and a bolt (600) are integrally connected in an axial direction with respect to the roller center axis (100) through a bolt (600) that penetrates from the outer side of the cover member to at least a portion of the inner side of the roller center axis.

[0031] The rotating part (11) can rotate circumferentially together with the lance tube (30), which rotates circumferentially and moves in the forward and backward directions, while simultaneously supporting it in the opposite direction of gravity, through contact between the roller member (200) and the bearing member (300) with the roller center axis (100). On the other hand, the fixed part (13) forms a fixed part in which the roller center axis (100), bracket (400), and cover member (500) are integrated via the bolt (600) in the axial direction, and as the integrated fixed part is attached to the lance tube support rack, the force (circumferential rotational force, forward and backward translational force, and gravity-direction load) and vibration (random direction vibration force) applied by the lance tube can be directly transmitted to and dispersed by the support rack. In particular, since the lance tube support rack has a relatively large surface area capable of absorbing force compared to the roller assembly, it is easy to disperse the force applied by the lance tube. Previously, as forces in all directions, including continuous rotational and translational motions of the roller center axis, loads, and vibrations, were directly transmitted to the area where the bracket and the roller center axis were connected, the said area wore out, causing the roller center axis to deviate radially. However, in the present invention, by configuring an integrated fixing part, forces in all directions originating from the lance tube are transmitted to the support rack, thereby reducing friction between the detailed devices of the fixing part and improving the durability of the device.

[0033] The roller center axis (100) is a device configuration for supporting the load of a lance tube acting in a direction perpendicular to the rotating center axis, and is located at the radial reference center of the rotating part (11) of the roller assembly, which is cylindrical in shape overall.

[0034] Referring to FIG. 2, the roller center axis (100) may be configured as a cylindrical shape with an axis formed in the axial direction and may be sequentially arranged concentrically with the bearing member (300) and the roller member (200), and may form a rotating part (11) that is integrally connected to them in the radial direction. Additionally, it may be sequentially arranged in the axial direction with the bracket (400) and the cover member (500), and may form a fixed part (13) that is integrally connected to them in the axial direction via a bolt (600).

[0035] As in one embodiment, the roller center axis (100) may be formed by having a center (110) in which the bearing member (300) is located in the axial direction; and a pair of side portions (130) located on both sides of the center in the axial direction. Accordingly, the center (110) of the roller center axis supports a rotating portion (11) (bearing member (300) and roller member (200)) arranged in the radial direction, and the side portions (130) of the roller center axis penetrate and connect to the leg portions (430) of a bracket arranged in the radial direction, thereby allowing the rotating portion (11) and the fixed portion (13) (bracket (400) and cover member (500)) to be connected to each other via the roller center axis (100).

[0036] Specifically, the side portion (130) of the roller center axis is formed continuously from the outer side in the axial direction to at least a portion of the interior, and includes a bolt hole (131) into which the bolt (600) is fastened, wherein the bolt hole may have screw threads formed therein. Accordingly, the roller center axis can be fixed to the cover member through bolt connection.

[0037] Additionally, the ratio (L2 / L1) of the length (L1) of the center (110) of the side portion (130) to the length (L1) of the center portion (110) of the roller center axis (100) may be 0.3 to 0.5, for example, 0.35 to 0.45. If the ratio (L2 / L1) of the length of the center portion and the side portion is less than 0.3, the relative ratio of the center portion increases, causing excessive load, rotational force, and vibration of the lance tube through the bearing member and the roller member. If the relative ratio of the side portion decreases, the bolt length that connects the roller center axis, bracket, and cover member through the axial direction decreases, making it difficult to provide sufficient support in the vertical and radial directions. Consequently, the durability of the roller assembly decreases during long-term use, and the area where the bracket and the roller center axis come into contact wears out in the radial direction, causing the roller center axis to detach.

[0038] Conversely, if the ratio of the length of the center (110) and the side (130) of the roller center axis (100) (L2 / L1) exceeds 0.5, the length (L2) of the side (130) increases relatively, causing the bearings (300) to be densely arranged in the center of the axis. Consequently, if the gap between the bearings narrows, the load during rotation is concentrated in the center, and the rotational stability and load distribution ability may be reduced as vibration and eccentricity increase. This structure causes the accumulation of fatigue stress during repeated loading and long-term operation, which consequently increases the risk of failure or fatal cracking of the roller center axis (100).

[0039] Meanwhile, the length of the center (L1) may refer to the length from the outer (left) surface of the bearing positioned furthest to the outer (right) surface of the bearing positioned furthest to the right among the plurality of bearing members in the longitudinal direction, and the length of the side portion (L2) may refer to the length obtained by subtracting the length of the center (L1) from the total length (L0) of the roller center axis in the longitudinal direction (L0 = L2 + L1 + L2).

[0040] Additionally, the roller center axis (100) may be composed of a high-strength and high-heat-resistant material, such as a ceramic material or a special alloy. Since the roller assembly supports the upper end of a lance tube that directly enters and exits the inside and outside of a boiler under high-temperature conditions, a durable material capable of withstanding a high-temperature environment is required. For example, at least one material selected from the group consisting of alumina, zirconia, silicon carbide (SiC), boron nitride (BN) as a ceramic material, and nickel alloy, titanium alloy, and high-melting-point metal-based alloy (W, Mo, Ta, etc.) as a metal alloy material may be applied.

[0042] The roller member (200) is a device for minimizing friction between devices that support the lance tube, such as a support rack, by making direct line contact with the lance tube (30) that moves forward, backward, and rotates.

[0043] The roller member (200) is characterized by being arranged concentrically with respect to the roller center axis (100) and arranged to make direct line contact with the outer surface of the lance tube. Accordingly, the reciprocating motion (forward and backward) and rotational movement of the lance tube are supported through a plurality of bearing members arranged between the roller center axis and the roller member, thereby preventing bending of the lance tube, and the rotational force, translational force, load force, and vibration force are transmitted to the support rack through the fixed part of the roller assembly, thereby preventing wear and damage to the roller assembly.

[0044] As in one embodiment, referring to FIG. 2, the roller member (200) may be configured in a hollow cylindrical shape so that a cylindrical roller center axis and a bearing member can be arranged concentrically inside, and the surface shape of the roller member may be formed as a flat surface so that it can make line contact with the lance tube.

[0045] Additionally, the roller member (200) may be made of materials that can be used as the roller center axis (100), and may be composed of a material that is the same as or different from the material used for the roller center axis.

[0047] The bearing member (300) is one of the machine elements that limits relative motion for a desired movement and reduces friction between moving parts, and in particular, in the present invention, it is intended to support random relative motions such as rotational motion, translational motion, gravity movement, and vibration of a lance tube disposed on the outer surface of the roller assembly and to reduce friction caused by such motion. Referring to FIG. 2, the bearing member (300) is disposed between the roller center axis (100) and the roller member (200).

[0048] As in one embodiment, referring to FIG. 2, the bearing member (300) may include a roller bearing or a ball bearing, and a plurality of bearings may be used in proportion to the area where the lance tube contacts the roller member. The lance tube for the shaving machine can support circumferential rotational motion, translational motion, gravity movement, and other vibrational motions through the bearing member while in direct contact with the surface of the roller member supported by the roller center axis.

[0049] Additionally, the bearing member (300) may be made of materials that can be used for the roller center axis (100) and the roller member (200), and may be composed of a material that is the same as or different from the material used for the roller center axis or the roller member.

[0051] The above bracket (400) is configured in a U-shape including a support portion (410) and a pair of leg portions (430) to support the roller assembly and to fix it to a lance tube support rack.

[0052] The above support member (410) is an area in contact with the lance tube support rack and forms the bottom surface of the roller assembly so that the roller assembly can function to be fixed to the lance tube support rack.

[0053] As in one embodiment, referring to FIGS. 2 and 3, the support member (410) may be formed in a plate shape, and specifically, the plate may have a plate shape in which the horizontal reference cross-section is a triangle, a square, a polygon other than a circle, an ellipse, or a combination thereof. Accordingly, the contact portion between the lance tube support rack and the support member corresponds to each other, so that the roller assembly can be easily fixed to the lance tube support rack.

[0054] Additionally, it may include a plurality of support bolt holes (411) that penetrate the support member (plate) (410) in the vertical direction and have internal threads, thereby allowing the roller assembly to be fixed to the lance tube support rack with bolts.

[0055] The above leg portion (430) is composed of at least one pair formed by extending to the upper ends of both sides of the support portion (410), and the leg portion (430) can be respectively connected through one end and the other end of the roller center axis (100) with respect to the axial direction.

[0056] Referring to FIG. 3 as in one embodiment, the leg portion (430) may be formed in a plate shape. Specifically, the plate may have a cross-section facing the rotating portion (11) in the vertical direction that is triangular, square, other polygonal, circular, elliptical, or a combination thereof. Accordingly, an internal space can be formed to accommodate a roller member, a bearing member, and a roller center axis, etc., which are arranged concentrically on the roller center axis.

[0057] Additionally, the leg portion (430) may include a bracket leg portion groove (431) that penetrates the leg portion (plate) (430) with respect to the axial direction, and thus, one end and the other end of the roller center axis (100) may be coupled to the bracket leg portion groove (431) formed in each of the pair of leg portions (430).

[0058] Specifically, regarding the bracket and the roller center axis, a pair of side portions (130) of the roller center axis may be positioned such that they substantially coincide with the outer surface of the leg portion (430) of the pair of brackets in the axial direction. For example, by positioning the end of the side portion (130) of the roller center axis at the outer end of the bracket leg portion groove (431), the roller center axis may penetrate the bracket in the axial direction without protruding outward. Accordingly, the cover member can press only in a single direction (axial direction) by making surface contact with the roller center axis and the bracket only in the axial direction, and since no friction occurs in the radial direction, the problem of the cover member wearing out can be prevented. On the other hand, when the roller center axis protrudes outside the bracket, the cover member is formed to completely wrap around the roller center axis in both the axial and radial directions. Consequently, due to the circumferential rotational force applied by the lance tube, the load in the direction of gravity, and random vibrations, the cover member (500) and the bracket leg groove (431) are worn out in the radial direction, causing the roller center axis to become dislodged.

[0060] The above cover member (500) is intended to tighten and connect the bracket (400) and the roller center axis (100) in the axial direction, and is located on the outer side of the bracket with respect to the axial direction and is configured to include a shell part (530) and a core part (510).

[0061] As in one embodiment, referring to FIGS. 2 and 4, the cover member (500) may be formed in a plate shape. Specifically, the plate shape may have a cross-section in the vertical direction that is triangular, square, other polygonal, circular, elliptical, or a combination thereof, and preferably, the cross-section facing the bracket leg portion and the roller center axis side portion in the vertical direction may be circular. Accordingly, the portions that contact the outer side of the bracket and the end of the roller center axis side portion in the axial direction are formed to correspond to each other, thereby allowing the bracket and the roller center axis to be tightened inward and joined.

[0062] The core portion (510) of the above cover member may be an area that makes surface contact with the entire end of the roller center axis (100) with respect to the axial direction, and specifically, may be an area that makes surface contact with the end of the roller center axis side portion with respect to the outside. Accordingly, the shape of the core portion (510) may be a plate shape corresponding to the end of the roller center axis side portion, and preferably, it may be a plate shape in which the cross-section facing the roller center axis side portion with respect to the vertical direction is circular.

[0063] The core portion (510) of the cover member may include a cover member bolt hole (511) that penetrates the cover member (500) in the axial direction and has screw threads formed inside, and thus the cover member can be fixed to the bracket and roller center axis by bolt connection.

[0064] The shell portion (530) of the above cover member may be an area that makes surface contact with at least a portion of the bracket (400) on the outside with respect to the axial direction, and specifically, may be an area that makes surface contact with the bracket leg portion (430) on the outside. Accordingly, the shape of the shell portion (530) may be a plate shape corresponding to the outside of the bracket leg portion (430), and preferably, the cross-section facing the bracket leg portion (430) with respect to the vertical direction may be a circular plate shape.

[0065] Accordingly, since the cover member presses only in a single direction (axial direction) while the core part contacts the roller center axis and the shell part contacts the bracket in the axial direction, radial movement and friction caused by the roller center axis are not transmitted to the cover member, thereby preventing the problem of the cover member wearing out in the radial direction.

[0066] As in one embodiment, regarding the cover member, bracket, and roller center axis, the ratio (R2 / R1) of the radius (R1) of the core part (510) to the radius (R2) of the shell part (530) of the cover member (500) may be 0.2 to 0.3, for example, 0.2 to 0.28 or 0.2 to 0.25. If the ratio (R2 / R1) of the radius of the core part and the shell part is less than 0.2, the area of ​​the shell part in surface contact with the bracket is excessively reduced, so it may be difficult to integrate the cover member and the bracket axially with the roller center axis, and thus there is a problem of the roller center axis deviating axially. On the other hand, if the radius ratio (R2 / R1) of the core part and the shell part exceeds 0.3, the surface area of ​​the shell part in contact with the bracket increases excessively, and the force tightening inward in the axial direction by the cover member is distributed across the entire surface area of ​​the shell part, so it may be difficult to integrate the cover member and the bracket axially with respect to the roller center axis.

[0068] The above bolt (600) is intended to tighten and connect the cover member (500), the bracket (400), and the roller center axis (100) in the axial direction, and is characterized by penetrating from the outer side of the core part (510) of the cover member to at least a portion of the inner side of the roller center axis (100).

[0069] Specifically, the bolt (600) can be placed in the bolt hole (511) of the cover member and the bolt hole (131) of the roller center axis based on the axial direction. Accordingly, the cover member, the bracket, and the roller center axis can be integrated through the bolt.

[0070] As in one embodiment, the bolt (600) may be composed of a head portion (not shown) located at the upper portion and a cylindrical body portion (not shown) formed connected to the head portion and having screw threads formed on its surface, and the head portion of the bolt may be located in the cover member bolt hole (511) and the body portion may be positioned in a state where it is inserted into the cover member bolt hole (511) and the roller center axis bolt hole (131).

[0071] Additionally, the ratio (L3 / L1) of the length (L1) of the center of the roller center axis (110) to the length (L3) of the bolt (600) may be 0.4 to 0.7, for example, 0.45 to 0.65 or 0.5 to 0.65. If the ratio (L3 / L1) of the length of the bolt to the center of the roller center axis is less than 0.4, the relative ratio of the center increases, causing excessive load, rotational force, and vibration of the lance tube through the bearing member and the roller member. If the relative ratio of the bolt length decreases, it is difficult to provide stable support in the axial and radial directions, which reduces the durability of the roller assembly during long-term use and causes the area where the bracket and the roller center axis come into contact to wear radially, resulting in the problem of the roller center axis becoming dislodged.

[0072] Conversely, if the length ratio (L3 / L1) of the center of the roller center axis (110) and the bolt (600) exceeds 0.7, the length of the bolt and the length of the bolt hole on the side of the roller increase relatively, and the empty space inside the roller center axis increases, which reduces the durability and strength of the roller center axis and may cause the roller center axis to break due to accumulated fatigue when used for a long time.

[0073] Meanwhile, the length (L3) of the above bolt (600) may refer to the total length from the surface of the head portion of the bolt to the surface of the body portion of the bolt in the longitudinal direction (axial direction).

[0075] The roller assembly (10) may further include a plurality of collar members (700) arranged concentrically with respect to the roller center axis (100) and located on both sides of the bearing in the axial direction; and a plurality of snap rings (800) arranged concentrically with respect to the roller center axis (100) and located on the outer side of the bearing located on the outermost side in the axial direction.

[0076] Through the above collar member, the exact spacing between bearings can be maintained and the load can be distributed evenly, and through the above snap ring, a plurality of bearings can be secured so that they do not deviate in the axial direction.

[0077] Specifically, the collar member (700) can be positioned between the plurality of bearings to function as a spacer, and the snap ring (800) can be fitted into and fixed in a groove formed on the surface of the roller center axis to prevent axial displacement of the plurality of bearings.

[0079] Another embodiment of the present invention provides a milling machine (1) connected to a roller assembly for supporting a milling machine lance tube.

[0080] The above-mentioned milling machine (1) comprises a lance tube (30); a lance tube support rack (50) that supports the lance tube; and a roller assembly (10) that is attached to the lance tube support rack (50) and contacts the lance tube.

[0081] The above lance tube (30) is used to remove impurities such as soot and ash attached to the high-temperature boiler tubes. The lance tube is positioned via the support rack and the roller assembly and moves back and forth along a certain path to enter the boiler. At this time, high-pressure steam can be sprayed through the lance tube that has entered the boiler to clean the surface of the tubes inside the furnace of the boiler.

[0082] Specifically, the lance tube (30) is formed in a long tube shape and may be made of a material having high heat resistance and strength to prevent torsional deformation under high temperature and high pressure conditions inside a boiler furnace, but the present invention is not limited thereto.

[0083] The above lance tube support rack (50) refers to a support that prevents bending and twisting deformation while the lance tube moves back and forth inside / outside the boiler, thereby supporting the lance tube so that it does not become eccentric.

[0084] The roller assembly (10) is a device that is attached to the lance tube support rack (50) and comes into direct contact with the lance tube. The detailed configuration of the roller assembly is the same as described above.

[0085] Meanwhile, the above-mentioned milling machine (1) may further include a carriage (not shown) which is a device for reciprocating and transporting a lance tube. Specifically, the carriage includes a long rod-shaped rack member with gears formed on its surface, a gearbox containing a pinion which is a circular gear that meshes with the gears of the rack, and a power member (motor). When the motor rotates the pinion, the gearbox moves along the rack, thereby reciprocating the lance tube in a straight line.

[0087] FIG. 5a is a drawing showing the load distributed to a pair of roller assemblies, each positioned at the lower left and lower right, in a shaving machine using a roller assembly according to one embodiment of the present invention, and FIG. 5b is a drawing of a shaving machine using a conventional roller assembly in FIG. 5a.

[0088] As shown in FIG. 5a, a roller assembly (10) according to one embodiment of the present invention has a load (F) distributed to each roller assembly even after long-term use following initial installation. L1 ), (F L2 ), (F R1 ), (F R2) is maintained at the same size, and the total load (W) of the lance tube is the resultant force (F) of the left and right roller assemblies. L , F R It is balanced and distributed by ). Accordingly, the resultant force of the left and right roller assemblies ((F L ), (F R )) and the reaction force of the left and right roller assemblies ((N L ), (N R Since this is structurally balanced, the wear resistance and durability of the roller assembly can be improved.

[0089] These results are attributed to the fact that the roller assembly (10) of the present invention maintains the equilibrium of the lance tube load distribution even after a long period of use through the integrated structure of the cover member (500), bracket (400), and roller center axis (100), thereby significantly reducing the accumulation of wear on the detailed device constituting the roller assembly including the bracket and significantly improving the durability of the roller assembly (see FIG. 5a).

[0090] Meanwhile, according to the present invention, even in the case of rotational motion (axial rotation / reciprocating motion of the lance tube), since the total load (W) of the lance tube acts relatively significantly, it is analyzed that the tangential torque and friction force do not have a fatal effect on the overall load distribution, except for the occurrence of partial structural stress.

[0091] On the other hand, the conventional roller assembly (10') of FIG. 5b adopts a snap ring fixing structure rather than a cover member, so that when a certain service life of the roller assembly has elapsed, the distributed load by the roller assembly gradually changes unevenly due to vibration and repetitive load. Uneven gravity distributed load (F) of the left and right roller assemblies L2 ' and F R2As the gravity-direction distributed load increases, maximum stress and friction are concentrated on the lower left and right sides of the bracket leg groove (431) (see honeycomb mark indicating a worn state). Accordingly, the wear location within the roller assembly shown in FIG. 5b is a typical structural problem where localized wear accumulates and grows, which can act as a major cause of reduced durability and structural failure of the roller assembly after long-term operation.

[0093] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be manufactured in various different forms, and those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical concept or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0094] 1: Jemaegi 10, 10': Roller assembly for supporting lance tube of a milling machine 11: (Lance tube support roller assembly) Rotating part 13: (Lance tube support roller assembly) Fixing part 30: Milling lance tube 50: Milling machine lance tube support rack 100, 100': Roller center axis 110: Center 130: Side 131: Roller center axis bolt hole 200, 200': Roller member 300: Bearing member 400, 400': Bracket 410: (Bracket) Support 411: Support bolt hole 430: (Bracket) Leg 431: Groove on bracket leg 500: Cover member 510: (Cover member) Core part 511: Cover member bolt hole 530: (Cover missing) Shell part 600: Bolt 700: Collar member 800, 800': snap ring

Claims

Claim 1 A cylindrical roller center axis (100); a roller member (200) arranged concentrically with respect to the roller center axis (100); a plurality of bearing members (300) arranged between the roller center axis (100) and the roller member (200); a U-shaped bracket (400) comprising a support member (410) fixed to a lance tube support rack, and a pair of leg members (430) extending to the upper ends of both sides of the support member and penetratingly connected to one end and the other end of the roller center axis (100), respectively; and a cover member (500) comprising a shell member (530) in surface contact with at least a portion of the bracket (400) from the outside and a core member (510) in surface contact with the entire end of the roller center axis (100) from the outside, in order to tighten and connect the bracket (400) and the roller center axis (100) in the axial direction. A roller assembly comprising: a bolt (600) penetrating from the outer side of the core portion (510) of the cover member to at least a portion of the inner side of the roller center axis (100) in order to tighten and combine the cover member (500), the bracket (400), and the roller center axis (100) in the axial direction, wherein the roller center axis (100) comprises a center portion (110) in which the bearing member (300) is located in the axial direction and a pair of side portions (130) located on both sides of the center portion in the axial direction, i) the ratio (L2 / L1) of the length (L1) of the center portion (110) to the length (L2) of the side portions (130) (L2 / L1) is 0.3 to 0.5, and ii) the leg portion (430) of the bracket is positioned to penetrate to at least a portion of the inner side of the side portions (130) of the roller center axis, and the bolt (600) of the roller center axis The side portion (130) is positioned to protrude beyond the point where the leg portion (430) is located, and the cover member (500) and the bolt (600) are each symmetrically provided as a pair on both sides of the roller assembly, and the cover member (500) has a ratio (R2 / R1) of the radius (R2) of the shell portion (530) to the radius (R1) of the core portion (510) of 0.2 to 0.3-person, roller assembly for supporting lance tube of a milling machine. Claim 2 A roller assembly for supporting a lance tube of a milling machine, characterized in that, in claim 1, a pair of side portions (130) of the roller center axis are each connected by penetrating the bracket (400) and are arranged to substantially coincide with the outer surface of the leg portion (430) of the bracket in the axial direction. Claim 3 delete Claim 4 A roller assembly for supporting a lance tube of a milling machine, wherein, in claim 1, the side portion (130) of the roller center axis is formed continuously from the outer side in the axial direction to at least a part of the interior, and includes a bolt hole (131) into which the bolt (600) is fastened, and the bolt (600) is characterized in that the ratio (L3 / L1) of the length (L1) of the center (110) of the roller center axis of the roller (600) to the length (L3) of the bolt (600) is 0.4 to 0.

7. Claim 5 A roller assembly for supporting a lance tube of a milling machine, characterized in that, in claim 1, it further comprises: a plurality of collar members (700) arranged concentrically with respect to the roller center axis (100) and located on both sides of the bearing in the axial direction; and a plurality of snap rings (800) arranged concentrically with respect to the roller center axis (100) and located on the outer side of the bearing located on the outermost side in the axial direction.

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