JP2015030065A - Nozzle support mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle support mechanism capable of smoothly moving a nozzle in a structure, while coaxially holding the nozzle to a steel pipe, even in the structure such as a column of a steel tower of using the steel pipe different in a diameter.SOLUTION: The nozzle support mechanism of the present invention comprises a frame 2 installed in a tip side part of a hose 12 for supplying an abrasive 15 to a nozzle 11, and a first support part 3 and a second support part 5 provided in the frame 2. The second support part 5 is provided on the upstream side of the hose 12 to the first support part 3, and the respective first support part 3 and second support part 5 comprise three or more of leg parts 31 and 51 separately arranged around the central axis P of the hose 12 or the nozzle 11. The respective leg parts 31 and 51 comprise first rollers 32 and 52 rotating in response to the movement of the nozzle 11 by abutting on an inner surface of the structure 100, and the first rollers 32 and 52 are protrusively-retreatably constituted in the radial direction of the hose 12 or the nozzle 11, and are energized outward.

Description

  The present invention is a nozzle support mechanism provided in a blasting apparatus for blasting the inner surface of a structure such as a support column formed by connecting a plurality of steel pipes in a row, and steel pipes having different inner diameters are used. The present invention relates to a nozzle support mechanism suitable for grinding an inner surface of a structure where a step is generated. Moreover, this invention relates to the nozzle support mechanism provided in the coating device which coats the inner surface of such a structure.

  Many of the steel towers that support power transmission lines are configured using a number of steel pipes. In such a steel tower, in order to prevent internal corrosion of the steel tower, an antirust coating is applied to the inner surface of the steel pipe constituting the steel tower. In rust-proof coating, a blasting process is performed as a pretreatment, and the inner surface of the steel pipe is cleaned or formed into a rough surface, and then a paint is applied to the inner surface of the steel pipe.

  In the blasting process of the inner surface, nozzles for discharging or projecting the abrasive material radially are inserted into the steel pipe and moved in the steel pipe. Further, in the painting process of the inner surface of the steel pipe, nozzles for discharging or spraying the paint radially are inserted into the steel pipe and moved in the steel pipe. These nozzles are placed on the central axis of the steel pipe, in other words, these nozzles are coaxial with the steel pipe in order to perform uniform blasting and uniform rust-proof coating on the inner surface of the steel tower or steel pipe. Need to be placed.

  For example, the nozzle device described in Japanese Patent Application Laid-Open No. 11-156254 includes three legs arranged at intervals of 120 degrees around the nozzle axis, and these legs are attached to the inner surface of the steel pipe. The nozzle is coaxially arranged with respect to the steel pipe by abutting against the inner surface of the steel pipe in a biased state (Patent Document 1).

Japanese Patent Laid-Open No. 11-156254

  When performing blasting or painting of the inner surface of the tower column using the nozzle device described in Patent Document 1, the nozzle device is inserted into the column from above so as not to pass through the inner surface of the blasted or painted column. After lowering to the lower end, the nozzle device is pulled upward while discharging the abrasive or paint.

  Steel pipes with different inner diameters are usually used for the pillars of the steel tower. The inner diameter of the connected steel pipes increases stepwise from the top to the bottom of the tower column, and the inner surface of the pillar changes in a step shape at the connection point of the steel pipes having different inner diameters. In the nozzle device described in Patent Document 1, when the nozzle device moves from a steel pipe with a large inner diameter to a steel pipe with a small inner diameter, the upstream end of the leg portion of the nozzle device is only the inner surface of the steel pipe with a small inner diameter. By contacting, a state in which the nozzle or the nozzle device is supported with respect to the support column occurs. In such a state, for example, when a radial force is applied to the nozzle device via a hose connected to the nozzle, a situation occurs in which the nozzle is greatly displaced from the central axis of the steel pipe.

  Moreover, since each leg part is comprised with the three leaf | plate springs connected by the U shape using the hinge structure, the nozzle apparatus of patent document 1 is a support | pillar inner surface in the connection part of a leaf | plate spring. Move in the column while rubbing. Furthermore, in the nozzle device described in Patent Document 1, the resistance when the leg portion of the nozzle device is caught on the inner surface of the support column at the connecting portion of the steel pipe having a large inner diameter and the steel pipe having a small inner diameter is large. Therefore, it is difficult for the nozzle device described in Patent Document 1 to move smoothly in the pillar of the steel tower.

  The present invention solves the above-described problem, and is a nozzle support mechanism provided in a blasting device or a coating device, on the inner surface by using a steel pipe having a different inner diameter represented by a pillar of a steel tower. Provided is a nozzle support mechanism that enables a nozzle to move smoothly in a structure while stably holding the nozzle coaxially with respect to a steel pipe even in a structure where a step is generated.

  The nozzle support mechanism of the present invention includes a cylindrical nozzle that is inserted into a tubular structure and discharges an abrasive or paint, and is movable along the length of the structure and with respect to the structure. In a nozzle support mechanism that is coaxially supported, a frame that is attached to a tip side portion of a hose that supplies the abrasive or paint to the nozzle and that defines the tip side portion to be linear, and A first support part and a second support part provided on the frame, wherein the second support part is provided upstream of the hose with respect to the first support part; Each of the first support portion and the second support portion includes three or more leg portions that are spaced substantially evenly around a central axis of the hose or the nozzle, and each leg portion is formed of the structure. Abutting the inner surface, along with the movement of the nozzle Includes a first roller for rolling, the first roller, with freely configured projecting and retracting in a radial direction of the hose or the nozzle, are biased outwardly.

  In the nozzle support mechanism of the present invention, each leg includes a guide member provided on the frame, a slide member that is guided by the guide member and slides along the central axis, and the slide member includes the slide member. A slide link means having a spring member biased to the upstream side of the hose and a first link pivoted on the sliding member at one end side is provided, and the other end side of the first link is the first link. The roller shaft may be pivotally supported.

  Furthermore, in the nozzle support mechanism of the present invention, the slide link means includes a second link having one end pivotally supported by the shaft portion of the first roller and the other end fixed. The second link may include a second roller disposed between the first roller and the other end.

  In the nozzle support mechanism of the present invention, a protective cover made of resin may be provided at the upstream end of the frame.

  According to the present invention, the first roller of the first support portion and the second support portion are in contact with the inner surface of the structure, so that the nozzle is supported coaxially with respect to the tube structure, and the inside of the structure The nozzle moves smoothly. Even when the nozzle passes through a region where the inner surface of the structure changes stepwise, the first roller of the first support portion and the first roller of the second support portion are in contact with the inner surfaces having different inner diameters. The nozzle is supported stably and moves smoothly in the structure.

It is a side view of the nozzle apparatus provided with the nozzle support mechanism which is an Example of this invention. 2 (a) and 2 (b) are cross-sectional views of the nozzle device shown in FIG. 1 taken along an arrow along a plane passing through lines AA and BB, respectively. It is a side view of the nozzle apparatus provided with the nozzle support mechanism which is an Example of this invention. It is the elements on larger scale of FIG. 1 which shows the 1st support part of the nozzle apparatus which concerns on this invention. It is the elements on larger scale of Drawing 3 showing the 1st support part of the nozzle device concerning the present invention. Fig.6 (a) is explanatory drawing of the part which comprises the 1st or 2nd annular part in the 1st half of the flame | frame of the nozzle apparatus which concerns on this invention. FIG. 6B is an explanatory view of a portion constituting the first or second annular portion in the second half of the frame of the nozzle device according to the present invention. It is a side view of the nozzle apparatus provided with the nozzle support mechanism which is an Example of this invention. It is a side view of the nozzle apparatus provided with the nozzle support mechanism which is an Example of this invention.

  Hereinafter, the present invention will be specifically described with reference to the drawings. 1 and 3 are side views of a nozzle device (1) provided with a nozzle support mechanism according to an embodiment of the present invention. 2 (a) and 2 (b) are cross-sectional views of the nozzle device (1) cut along the plane passing through lines AA and BB, respectively, as viewed from the direction of the arrows.

  The nozzle device (1) is a tower column (100) constructed using steel pipes of different diameters (note that the column (100) is shown in a simplified manner in FIG. 1 and other drawings). It constitutes a part of a blasting device for blasting the inner surface. The nozzle device (1) is inserted into the support column (100) and moves in the support column (100), and the granular or sandy abrasive (15) is supported from the tip of the cylindrical nozzle (11). Projects toward the inner surface of (100) (see FIG. 3 etc.). FIG. 1 shows a pattern in which the nozzle device (1) is arranged in the steel pipe having the smallest diameter at the upper part of the tower column (100). FIG. 3 shows a pattern in which the nozzle device (1) is disposed in the steel pipe having the largest diameter at the lower portion of the support column (100).

  The nozzle support mechanism of the nozzle device (1) is movable within the support column (100) along the length direction of the support column (100) and coaxial with the support column (100) or the inner surface thereof. Support (11). For the sake of explanation, in FIG. 1, the support column (100) is illustrated as being arranged vertically (the same applies to other drawings). However, it should be noted that the tower pillars (100) that support the wires are usually laid down or have such an area that is tilted several degrees (eg, 3 degrees) with respect to the vertical direction.

  A cylindrical nozzle holder (13) is fixed to the tip of a hose (12) for supplying the abrasive (15) to the nozzle (11). The nozzle (11) is detachably attached to the nozzle holder (13). The rear end side or the upstream side of the hose (12) is connected to the main body portion of the blasting device, and the main body portion includes a hopper, a pressurized tank, and the like for charging the abrasive (15) (see FIG. Not shown). Since the details of the main body of the blasting device are out of the scope of the present invention, the description thereof will be omitted.

  In this specification, in order to refer to the position of the component of the nozzle device (1) and its part, the “upstream” and “downstream” are based on the flow direction of the abrasive (15) along the hose (12). Use the word “side”. For example, “upstream” for a component shown in FIG. 1 means a region or portion of that component located on the upstream side of the flow of the abrasive (15) (upper side in FIG. 1). “Downstream” means the region or part of the component located downstream in the flow of the abrasive (15) (lower in FIG. 1).

 The nozzle support mechanism includes a frame (2) that is attached to the tip side or downstream portion of the hose (12). The frame (2) is configured by combining the first half (2a) and the second half (2b) so that it can be divided into two. Details of the first half (2a) and the second half (2b) will be described later.

  The frame (2) includes a first annular portion (21) disposed in the vicinity of the downstream end of the hose (12), and a second annular portion disposed upstream of the first annular portion (21) ( 22) and a third annular portion (23) disposed upstream of the second annular portion (22). The annular portions (21), (22), and (23) are connected by a plurality of tubular connecting members (24a) and (24b) arranged along the length direction of the hose (12). An opening (25) into which the hose (12) is fitted is formed at the center of the first annular portion (21) and the second annular portion (23) (see FIGS. 2 (a) and 2 (b)). . The same applies to the third annular portion (23).

  In the frame (2), the portion of the hose (12) on the tip side, more specifically, the region of the hose (12) located between the first annular portion (21) and the third annular portion (23) is linear. It prescribes to become. A positioning member (26) for positioning the nozzle holder (13) with respect to the first annular portion (21) is fixed downstream of the first annular portion (21). The positioning member (26) is an annular thick plate member having an opening that matches the outer peripheral surface of the nozzle holder (13). The positioning member (26) is attached to the first annular portion (21) with the nozzle holder (13) fitted into the opening. By fixing, the central axis of the nozzle holder (13) and the central axis of the tip side portion of the hose (12) are arranged on the same line. The nozzle (11) is mounted on the nozzle holder (13) so that the central axis thereof is arranged on the same line as the central axis of the nozzle holder (13). In FIG. 1, a straight line P indicating these central axes is indicated by a one-dot chain line.

  The nozzle support mechanism of the nozzle device (1) includes a first support part (3) and a second support part (5) provided on the frame (2). The second support part (5) is provided on the upstream side with respect to the first support part (3). The first support part (3) has a plurality of leg parts (31), and these leg parts (31) are spaced substantially evenly around the central axis P of the hose (12) or nozzle (11). Are arranged. The second support portion (5) also has a plurality of leg portions (51) arranged substantially equally spaced around the central axis P of the hose (12) or nozzle (11).

  As shown in FIG. 2 (a), in the present embodiment, the first support portion (3) has four pieces arranged at intervals of about 90 degrees around the central axis P of the hose (12) or nozzle (11). It has a leg part (31). As shown in FIG. 2 (b), the second support part (5) is also provided with four leg parts (51) arranged at intervals of about 90 degrees around the central axis P of the hose (12) or nozzle (11). )have.

  Each leg portion (31) of the first support portion (3) includes a first roller (32) configured to be movable in and out in the radial direction of the hose (12) or the nozzle (11). The first roller (32) is urged toward the inner surface of the column (100) or outward, contacts the inner surface of the column (100), and rotates as the nozzle (11) moves. As shown in FIG. 2A, the rotation axis of each first roller 32 is arranged so as to be orthogonal to the central axis P. As shown in FIG. 2 (b), each leg portion (51) of the second support portion (5) is also similar to the first roller (32) of the leg portion (31) of the first support portion (3). One roller (52) is provided.

  As shown in FIG. 3, when the nozzle device (1) is arranged in a steel pipe having a larger inner diameter, the leg portions (31) of the first support portion (3) and the second support portion (5). The first rollers (32) and (52) of (51) are displaced more outward than the positions shown in FIG. 1, and are in contact with the inner surface of the support column (100).

  In the nozzle support mechanism of the present invention, each leg (31) (51) can be configured using a link means or a link mechanism. In this embodiment, each leg portion (31) (51) is configured using a slide link (slider link) means or mechanism, more specifically, a four-bar slide link means or a four-bar slide link mechanism. It is comprised using.

  4 is an enlarged view of the first support portion (3) in the state shown in FIG. 1, and FIG. 4 is a partial enlarged view of the first support portion (3) in the state shown in FIG. The slide link means of each leg portion (31) of the first support portion (3) includes a guide member (33) provided on the frame (2) and a guide member (33) guided along the central axis P. A sliding member (34) that slides, a spring member (35) that biases the sliding member (34) upstream, and a first link that is pivotally supported at one end by the sliding member (34). The other end side of the first link is pivotally supported by the shaft portion of the first roller (32).

  In this embodiment, each guide member (33) of the first support portion (3) is formed in a rectangular parallelepiped shape, and the inside thereof is hollow. In the upstream portion of the guide member (33), a long hole (37) is opened along the central axis P. The short shaft-shaped sliding member (34) is arranged so that both ends thereof protrude from the long holes (37), and moves while being guided by the long holes (37).

  The spring member (35) is disposed between the sliding member (34) and the downstream end face (see FIG. 6A) inside the guide member (33). In this embodiment, a coil spring is used as the spring member (35). In FIG. 4, the contracted spring member (35) hidden by the wall surface of the guide member (33) is indicated by a broken line. In FIG. 5, the portion hidden in the wall surface of the guide member (33) in the extended spring member (35) is indicated by a broken line.

  The first link includes a pair of long plate-like first link members (38), and one end of one of the first link members is one end of a sliding member (34) protruding from the guide member (33). One end of the other first link member (38) is pivotally supported by the other end of the sliding member (34) protruding from the guide member (33). The other end of the first link member (38) is pivotally supported by one end of the shaft portion of the first roller (32), and the other end of the other first link member (38) is the first roller (38). 32) is pivotally supported at the other end of the shaft.

  The slide link means of each leg portion (31) of the first support portion (3) is a second link whose one end is pivotally supported by the shaft portion of the first roller (32) and the other end is a fixed end. It has. The second link includes a pair of long plate-like second link members (42), and one end of one second link member (42) is pivotally supported by one end of the shaft portion of the first roller (32). One end of the other second link member (42) is pivotally supported by the other end of the shaft portion of the first roller (32). The other end of one second link member (42) serving as a fixed end is pivotally supported by one end of a shaft member (43) provided on the frame (2), and the other first link member serving as a fixed end. The other end of (42) is pivotally supported by the other end of the shaft member (43).

  In the present embodiment, each second link includes a second roller (44) disposed between the first roller (32) and the shaft member (43). Both ends of the shaft portion of the second roller (44) are pivotally supported by the second link member (42). When the hose (12) is pulled upstream and the nozzle device (1) moves from a steel pipe with a large diameter toward a steel pipe with a small diameter in the support (100), the second roller (44) The nozzle device (1) moves smoothly at the stepped portion on the inner surface of the support column (100) by hitting the stepped portion or the stepped portion on the inner surface of the support column (100). The second link member (42) includes a shaft between the first roller (32) and the second roller (44), and a shaft between the second roller (44) and the shaft member (43). A notch (45) is provided, and contact between the inner surface of the support column (100) and the second link member (42) is suppressed.

  As shown in FIG. 1 and the like, the slide link means of each leg portion (51) of the second support portion (5) is the same as the slide link means of each leg portion (31) of the first support portion (3). A guide member (53) provided in the frame (2) and a sliding member (54) guided along a central axis P while being guided by a slot (57) (see FIG. 3) of the guide member (53). ), A spring member (55) for urging the sliding member (54) to the upstream side, one end side being pivotally supported by the sliding member (54) and the other end side being a shaft portion of the first roller (52) The first link pivotally supported, the second link whose one end is pivotally supported by the shaft portion of the first roller (52) and the other end is a fixed end, the first roller (52) and the shaft member ( 63) and a second roller (64) disposed therebetween.

  The first link includes a pair of first link members (58) similar to the first link member (38) of the first support portion (3), and the second link is of the first support portion (3). A pair of second link members (62) similar to the second link member (42) is included. Two notches (65) are formed in the second link member (62) in the same manner as the notches (45) of the first support portion (3).

  A support member (46) that pivotally supports the shaft member (43) of the first support portion (3) at the downstream end of the guide member (53) of each leg portion (51) of the second support portion (5). ) Is fixed. One end of the second link member (62) serving as a fixed end is one end of the shaft member (63) pivotally supported by the support member (66) provided in the third annular portion (23) of the frame (2). One end of the other second link member (62) which is pivotally supported by the shaft member and serves as a fixed end is pivotally supported by the other end of the shaft member (63).

  In the present embodiment, the frame (2) is formed by combining two halves (2a) (2b). The first half (2a) is composed of two adjacent ones of the first support (3). The guide member (33) of the leg portion (31) is included, and as shown in FIG. 6 (a), the guide member (33) is a fan-shaped connecting member (71a constituting the first annular portion (21)). ) And an extending member (73a) having a hole (72a) is fixed to each of the guide members (33). As shown in FIG. 6 (b), the second half (2b) includes guide members (33) of the remaining two leg portions (31) of the first support portion (3). (33) is also joined by a fan-like connecting member (71b) constituting the first annular portion (21), and a hole (72b) into which a bolt (27) is inserted into each of the guide members (33). The extending member (73b) opened is fixed. As shown in FIG. 2, the portion shown in FIG. 6 (a) and the portion shown in FIG. 6 (b) are overlapped with the holes (72a) and (72b) of the extending members (73a) and (73b). The bolts 27 and nuts 28 are combined and fixed (the positioning member 26 positioning the nozzle holder 13 is fastened together). At this time, the hose (12) is sandwiched between the inner edge of the portion shown in FIG. 6 (a) and the inner edge of the portion shown in FIG. 6 (b), as shown in FIG. 2 (a).

  Further, the first half (2a) includes guide members (53) of two adjacent leg portions (51) of the second support portion (5), as shown in FIG. These guide members (53) are joined by a fan-like connecting member (81a) constituting the second annular portion (22), and a bolt (27) is inserted into each of these guide members (53). The extending member (83a) in which (82a) is opened is fixed. The connecting member (81a) is connected to the fan-like connecting member (71a) constituting the first annular portion (21) of the first half (2a) by the tubular connecting member (24a). The second half (2b) includes guide members (53) of the remaining two legs (51) of the second support portion (5). As shown in FIG. (53) is also joined by a fan-like connecting member (81b) constituting the second annular portion (22), and a hole (82b) into which a bolt (27) is inserted into each of the guide members (53). The extension member (83b) opened is fixed. The connecting member (83b) is connected by a fan-like connecting member (73b) constituting the first annular portion (21) and a tubular connecting member (24b). In the same manner as described above, the portions constituting the second annular portion (22) of the first half (2a) and the second half (2b) are combined so as to sandwich the hose (12), and the bolt ( It is fixed with 27) and nut (28).

  Further, the first half (2a) includes a support member (66) that pivotally supports the shaft member (63) of two adjacent leg portions (51) of the second support portion (5). Similarly to the portion shown in (a), these support members (66) are joined by a fan-like connecting member (91a) constituting the third annular portion (23), and each of the support members (66) An extension member (93a) having a hole into which a bolt (27) is inserted is fixed to (see FIG. 7). The connecting member (91a) is connected to the fan-like connecting member (83a) constituting the second annular portion (22) of the second half (2b) by the tubular connecting member (24a). The second half (2b) includes a support member (66) that pivotally supports the shaft member (63) of the remaining two legs (51) of the second support portion (5). In the same manner as the portion shown in FIG. 5), these support members (66) are also joined by a fan-shaped connecting member (not shown) constituting the second annular portion (22), and the support members (66) An extension member (93b) having a hole into which a bolt (27) is inserted is fixed to each (see FIG. 7). This connecting member is connected to the fan-like connecting member (83b) constituting the second annular portion (22) of the second half (2b) by the tubular connecting member (24b). In the same manner as described above, the parts constituting the third annular portion (23) of the first half (2a) and the second half (2b) are combined so as to sandwich the hose (12), and the bolt ( It is fixed with 27) and nut (28).

  On the upstream side of the third annular portion (23), a bowl-shaped protective member (14) having an opening through which the hose (12) passes is detachably attached. The protective member (14) is made of synthetic resin or plastic, and as will be described later, the hose (12) is pulled upstream in the support column (100), and the nozzle device (1) is connected to the support device. When moving from a steel pipe with a large diameter to a steel pipe with a small diameter in (100), a protective member (14) that is softer than the metal frame (2) is a stepped portion on the inner surface of the column (100) (described later). By hitting the flange portion (101)), scratches and wear of the step portion on the inner surface of the support column (100) are suppressed.

  Next, the inner diameter of the steel pipe constituting the support column (100), which explains the process of blasting the inner surface of the support column (100) using the nozzle device (1), is gradually increased from top to bottom ( As a matter of course, a plurality of steel pipes having the same diameter are arranged continuously). As shown in FIGS. 7 and 8, in this embodiment, the support column (100) is configured using three types of steel pipes having different inner diameters. The upper portion of the support column (100) is configured by connecting a first steel pipe having the smallest inner diameter (for example, a steel tube having an inner diameter of 75 mm), and the lower portion of the support column (100) is configured by a third steel tube having the largest inner diameter (for example, The middle part of the column (100) between the upper part and the lower part is connected to a second steel pipe (for example, an inner diameter that is larger than the first steel pipe and smaller than the third steel pipe). Is formed by connecting 133 mm steel pipes). An annular flange portion where a steel pipe having a large diameter is connected to an end portion of a steel pipe having a small diameter at a connecting portion between the upper portion and the middle portion (see FIG. 8) and a connecting portion between the middle portion and the lower portion (see FIG. 7). (101) is formed, and the inner diameter of the support column (100) changes stepwise. In the present invention, the number of types of steel pipes having different inner diameters constituting the support column (100) may be two or more, for example, four.

  First, the nozzle device (1) is inserted into the column (100) from above the column (100) with the nozzle (11) side down. When the nozzle device (1) is inserted into the support column (100), the leg portions (31) and (51) of the first support portion (3) and the second support portion (5) of the nozzle support mechanism are The first link member (38) (58) or the second link member (42) (62) is folded by being pushed by the operator. As the force directed to the downstream side is applied to the hose (12), as shown in FIG. 1, at least first legs (31) and (51) of the first support part (3) and the second support part (5) are provided. The nozzle device (1) advances to the lower side of the strut (100) with one roller (32) (52) in contact with the inner surface of the upper portion of the strut (100) where the first steel pipe is used. .

  When the nozzle device (1) passes through the upper part and further through the middle part and reaches the lower part of the column (100), as shown in FIG. 3, each leg part (1) of the first support part (3) and the second support part (5) 31) (51) stands up toward the inner surface of the support column (100), and the first rollers (32), (52) of these legs (31), (51) constitute the support column (100). By contacting the inner surface of the steel pipe, the nozzle (11) of the nozzle device (1) is arranged coaxially with the inner surface of the column (100) at the lower portion of the column (100).

  When the nozzle (11) reaches near the lower end of the column (100), the downward movement of the nozzle device (1) is completed. Then, the grinding material (15) is supplied to the nozzle (11) from the main body of the blasting device via the hose (12), whereby the surface treatment of the inner surface of the support column (100) is started. The abrasive (15) supplied to the nozzle (11) is discharged radially from the tip of the nozzle (11), and the inner surface of the support column (100) is shaved.

  In the present embodiment, the nozzle (11) is of a type provided with a cone part that projects the abrasive (15) radially in the radial direction when the abrasive (15) collides. However, the nozzle (11) supported by the nozzle support mechanism of the present invention is not limited to such a type of nozzle, for example, by providing an injection port that rotates around an axis, the abrasive material, etc. A nozzle that projects laterally (see, for example, JP-A-7-88768) can also be supported by the nozzle support mechanism of the present invention.

  When the force directed upstream is applied to the hose (12), the nozzle device (1) is pulled up while discharging the abrasive (15) from the nozzle (11). When the middle part and the lower part of the support column (100) are connected, first, the first roller (52) of the leg part (51) of the second support part (5) comes into contact with the flange part (101) of the second steel pipe. . When the nozzle device (1) is further lifted, the first link member (58) and the second link member (62) of the leg portion (51) of the second support portion (5) are tilted, and the first roller ( 52) moves inward in the radial direction and comes into contact with the inner surface of the second steel pipe constituting the middle part of the support column (100).

  Further, when the nozzle device (1) is pulled up, as shown in FIG. 7, the first roller (32) of the leg portion (31) of the first support portion (3) is connected to the flange portion (101) of the second steel pipe. Abut. And the 1st link member (38) and the 2nd link member (42) of the leg part (31) of the 1st support part (3) tilt, and the 1st roller (32) is inward in the diameter direction. It moves and contacts the inner surface of the second steel pipe. The first roller (32) of each leg part (31) of the first support part (3) and the first roller (52) of each leg part (51) of the second support part (5) are made of the second steel pipe. The nozzle device (1) is pulled up in the middle portion of the support column (100) while being in contact with the inner surface.

  When the nozzle device (1) moves from the lower part to the middle part of the column (100), even if the inner diameter of the inner surface of the column (100) through which the nozzle device (1) passes changes stepwise, the first support ( Both the leg part (31) of 3) and the leg part (51) of the second support part (5) located upstream of the first support part (3) are always in contact with the inner surface of the column (100). Thus, the nozzle device (1) or the nozzle (11) is always stably supported coaxially with respect to the support column (100). Further, when the first rollers (32) and (52) of the leg portions (31) and (51) are in contact with the flange portion (101) of the second steel pipe, the deformation of the leg portions (31) and (51), The nozzle device (1) is pulled up smoothly.

  When the nozzle device (1) reaches the connecting part between the middle part and the upper part of the support column (100), first, the second roller (64) of the leg part (51) of the second support part (5) is the flange part of the first steel pipe. Abuts (101). When the nozzle device (1) is further lifted, the first link member (58) and the second link member (62) of the leg portion (51) of the second support portion (5) are tilted, and the first roller ( 52) moves inward in the radial direction and comes into contact with the inner surface of the first steel pipe constituting the upper portion of the support column (100).

  Further, when the nozzle device (1) is pulled up, as shown in FIG. 8, the second roller (44) of the leg portion (31) of the first support portion (3) is connected to the flange portion (101) of the first steel pipe. Abut. And the 1st link member (38) and the 2nd link member (42) of the leg part (31) of the 1st support part (3) tilt, and the 1st roller (32) is inward in the diameter direction. It moves and contacts the inner surface of the first steel pipe.

  Even when the inner diameter of the inner surface of the column (100) through which the nozzle device (1) passes is changed stepwise when the nozzle device (1) moves from the middle to the upper part of the column (100), the first Both the leg part (31) of the support part (3) and the leg part (51) of the second support part (5) located upstream of the first support part (3) are always connected to the inner surface of the column (100). By abutting, the nozzle device (1) or the nozzle (11) is always stably supported coaxially with respect to the support column (100).

  The change in the inner surface of the support column (100) when the nozzle device (1) moves from the middle to the upper part of the support column (100) is larger than that when moving from the lower part of the support column (100) to the middle part. The first rollers (32) and (52) of the leg portions (31) and (51) of the first support portion (3) and the second support portion (5) cannot contact the flange portion (101) of the first steel pipe. However, even in such a case, the second rollers (44) and (64) of these legs (31) and (51) come into contact with the flange (101) of the third steel pipe, so that the legs ( 31) The deformation of (51) and the lifting of the nozzle device (1) are performed smoothly.

  When the nozzle device (1) moves from the middle portion to the upper portion of the support column (100), a large force in the radial direction may cause the nozzle device (1) to tilt with respect to the support column (100). However, in this case, the tapered surface of the protective member (14) provided on the upstream side of the third annular portion (23) comes into contact with the flange portion (101) of the first steel pipe, so that the inner surface of the support column (100) is obtained. Damage and wear are prevented, and the smooth movement of the nozzle device (1) is maintained.

  Further, when the nozzle device (1) is pulled up from the state shown in FIG. 8, as shown in FIG. 1, at least the first roller (32) of each leg portion (31) of the first support portion (3); In a state where at least the first roller (52) of each leg portion (51) of the second support portion (5) is in contact with the inner surface of the first steel pipe, the nozzle device (1) is disposed in the upper part of the support column (100). Be raised. When the nozzle (11) of the nozzle device (1) reaches the upper end of the upper portion of the support column (100), the supply of the abrasive to the nozzle (11) is stopped, and the blasting process of the inner surface of the support column (100) is completed. To do.

  After the blast treatment of the inner surface of the support column (100) is completed, the inner surface of the support column (100) is rust-proofed. The nozzle support mechanism of the present invention can also be used for a nozzle device included in a coating device used for rust-proof coating of the inner surface of the support column (100). By making the necessary changes to release the paint in place of the abrasive (15), the nozzle device (1) described above can be used for the anticorrosive coating of the column (100), and the changes to be made are: It will be apparent to those skilled in the art that the basic structure of the frame (2), the first support portion (3), and the second support portion (5) of the nozzle device (1) does not reach or hardly reaches.

  In the above embodiment, the nozzle support mechanism of the present invention is applied to the nozzle device (1) used for the blasting treatment or the anticorrosion coating of the inner surface of the support column (100). However, the nozzle device to which the nozzle support mechanism of the present invention is applied may be one that blasts or rust-proofs a tubular structure other than the support column (100), in particular, a tubular structure with a variable inner diameter Will be apparent to those skilled in the art.

  In the above embodiment, the four legs (31) of the first support (3) and the four legs (51) of the second support (5) are aligned along the central axis P. For example, the position of the leg part (51) of the second support part (5) may be shifted around the central axis P with respect to the leg part (31) of the first support part (3). In the present invention, the number of the leg portions (31) of the first support portion (3) and the number of the leg portions (51) of the second support portion (3) are not limited to four. ) Is preferably set to three or more from the viewpoint of stably supporting. The leg part (31) of the first support part (3) and the leg part (51) of the second support part (3) are arranged evenly or substantially equally spaced around the central axis P. The number of leg portions (31) of the first support portion (3) may not be the same as the number of leg portions (51) of the second support portion (3).

  The above description is provided to illustrate the present invention and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

(1) Nozzle device
(11) Nozzle
(12) Hose
(14) Protection member
(15) Abrasive material
(2) Frame
(2a) First half
(2b) Second half
(3) First support part
(31) Leg
(32) 1st roller
(33) Guide member
(34) Sliding member
(35) Spring member
(37) Slotted hole
(38) First link member
(42) Second link member
(43) Shaft member
(44) Second roller
(45) Notch
(5) Second support part
(51) Leg
(52) 1st roller
(53) Guide member
(54) Sliding member
(55) Spring member
(57) Slotted hole
(58) First link member
(62) Second link member
(63) Shaft member
(64) Second roller
(65) Notch
(100) Prop
(101) Flange

Claims (4)

NOZZLE SUPPORT MECHANISM FOR SUPPORTING A CYLINDRICAL NOZZLE INSERTED IN A TUBE STRUCTURE TO RELEASE Abrasives OR COATINGS MOVABLE LONG TO THE STRUCTURE AND COAXIAL TO THE STRUCTURE In
A frame that is attached to a tip side portion of a hose that supplies the abrasive or paint to the nozzle, and that defines the tip side portion to be linear, a first support portion provided on the frame, and A second support part,
The second support part is provided on the upstream side of the hose with respect to the first support part,
Each of the first support part and the second support part includes three or more legs arranged substantially equally spaced around the central axis of the hose or the nozzle,
Each leg comprises a first roller that contacts the inner surface of the structure and rotates as the nozzle moves,
The first roller is a nozzle support mechanism configured to be movable in and out in the radial direction of the hose or the nozzle and biased outward.   Each leg portion includes a guide member provided on the frame, a slide member that is guided by the guide member and slides along the central axis, and biases the slide member toward the upstream side of the hose. A slide link means having a spring member and a first link having one end pivotally supported by the sliding member is provided, and the other end of the first link is pivotally supported by the shaft portion of the first roller. The nozzle support mechanism according to claim 1.   The slide link means includes a second link whose one end is pivotally supported by the shaft portion of the first roller and whose other end is a fixed end, and the second link is connected to the first roller. The nozzle support mechanism of Claim 2 provided with the 2nd roller arrange | positioned between the said other ends.   The nozzle support mechanism according to any one of claims 1 to 3, wherein a protective cover made of resin is provided at an upstream end of the frame.

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