Curl-forming device

Abstract

To improve the workability when installing or removing a winding bias forming device, which forms winding bias on a strip member that becomes a spiral tube, onto or from a reel.SOLUTION: A curl forming device 20 is rotatably mounted at the central portion of a cylindrical reel 10 that holds the annular winding body 91 of the belt member 90. The curl forming section 21 is housed within the tubular device frame 30 of the winding bias forming device 20. Multiple rolling units 40 are provided at circumferential intervals along the end face portion 32 of the device frame 30. The base member 41 of each rolling unit 40 is selectively positioned relative to the device frame 30 in either a protruding position or a retracted position. A rolling member 42 is rotatably supported on the base member 41. The rolling member 42 rotatably contacts the circular rotational guide 14 on the inner circumference of the reel 10 when in the protruding position and retracts radially inward from the rotational guide 14 when in the retracted position.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a curl forming device that forms a curl (curvature) in a strip-shaped material that will become a helical tube, and more particularly to a curl forming device that is used by being housed on a reel that holds a circularly wound body of a strip-shaped material. [Background technology]

[0002] For example, a pipeline rehabilitation method for lining a pipeline such as an aging sewer pipe with a rehabilitation pipe is well known. A known rehabilitation pipe is a spiral pipe made from a long strip-shaped member (profile). Generally, before being made into a pipe, the strip-shaped member is wound into a ring-shaped wound body and housed on a cylindrical reel. A curling device is installed in the center of the reel (see Patent Document 1, etc.). The strip-shaped member is sequentially unwound from the ring-shaped wound body and introduced into the curling device. The curling device imparts a curl (curvature) to the strip-shaped member. The curled strip-shaped member is sent to the pipeline to be rehabilitated and made into a spiral rehabilitated pipe by a pipe making machine.

[0003] The curl forming device described in Patent Document 1 includes a curl forming unit including a pinch roller and a drive motor, and a cylindrical frame that surrounds and supports the curl forming unit. Four rolling units are provided at 90° intervals at both axial ends of the frame. Each rolling unit includes a bearing member fixed to the frame and a rolling element rotatably supported by the bearing member. Meanwhile, circular rotation guides with a diameter slightly larger than the frame are provided at both axial ends of the reel. The rolling elements protrude radially outward from the frame and are in rolling contact with the rotation guides. This allows the curl forming device to rotate relative to the reel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication WO2015 / 186416 Summary of the Invention [Problem to be solved by the invention]

[0005] When the curl forming device of Patent Document 1 is inserted into a reel for installation, each rolling unit must be removed from the device frame to avoid interference between the rolling elements and the rotation guide. After inserting the device frame into the reel, the device frame is raised using a forklift or similar device, and the bearing members of the two lower rolling units are attached to the device frame with bolts. Next, the device frame is lowered using a forklift or similar device, and the bearing members of the two upper rolling units are attached to the device frame with bolts. Therefore, installation requires manual carrying of the four (plural) rolling units one by one, which is inefficient. When removing the curl forming device from the reel, the procedure must be reversed from the installation procedure, which is also inefficient. SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to improve the workability when installing and removing a curl forming device on a reel. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a curl forming device that is rotatably installed at the center of a cylindrical reel that holds an annular wound body formed by winding a belt-shaped member that becomes a helical tube in an annular shape, the device comprising: a cylindrical device frame; a curl forming unit that is housed in the device frame and forms a curl on the belt-shaped material unwound from the annular winding body; a plurality of rolling units provided at intervals in the circumferential direction of the end surface portion of the device frame; each rolling unit comprising: a base member selectively disposed with respect to the device frame at a protruding position and a retracted position radially inward of the device frame relative to the protruding position; The reel is characterized by including a rolling element that is rotatably supported on the base member, that is in rolling contact with a circular rotation guide on the inner circumference of the reel when in the protruding position, and that retracts radially inward from the contact position when in the retracted position.

[0007] According to this curling device, when inserting it into the reel for installation, the base members of each rolling unit are retracted relative to the device frame, and the rolling elements are retracted radially inward from the position where they contact the rotation guide. This prevents the rolling elements from interfering with the rotation guide when inserting the curling device. To avoid interference, it is not necessary to remove each rolling unit from the device frame and carry each rolling unit by hand, etc. The entire curling device can be inserted into the reel as a whole. After the curl forming device is inserted into the reel, the base members of each rolling unit are shifted radially outward from the device frame to the protruding position, so that the rolling elements come into contact with the rotation guides. In this way, the curl forming device can be easily installed inside the reel. When removing the curl forming device from the reel, the installation procedure is carried out in reverse.

[0008] Preferably, when in the protruding position, the rolling elements protrude radially outward from the end surface portion, and when in the retracted position, the rolling elements retract radially inward from the outer periphery of the end surface portion. As a result, when the curl forming device is installed in the reel, the base member of the rolling unit is set to the protruding position, so that the rolling elements come into contact with the rotary guide, but the device frame does not come into contact with the rotary guide. When the curl forming device is inserted into or removed from the reel, the base member of the rolling unit is set to the retracted position, so that the rolling elements are retracted radially inward from the outer periphery of the end face. This reliably prevents the rolling elements from interfering with the rotary guide.

[0009] Preferably, an engagement portion is formed on one of the device frame and the base member, and two engagement receiving portions that selectively engage with the engagement portion are formed on the other of the device frame and the base member, spaced apart from each other in the radial direction. When the base member of the rolling unit is placed in the retracted position, one of the two engagement receiving portions can be engaged with the engagement portion. The engagement between the one engagement receiving portion and the engagement portion fixes the base member in the retracted position. When the base member of the rolling unit is placed in the protruding position, the other of the two engagement receiving portions becomes engageable with the engagement portion, and the base member is fixed in the protruding position by the engagement between the other engagement receiving portion and the engagement portion.

[0010] Preferably, the engaging portion and the two engaging receiving portions include bolt holes through which connecting bolts are inserted or screwed. When the base member of the rolling unit is placed in the retracted position, the bolt holes constituting the one of the engagement receiving portions are aligned with the bolt holes constituting the engagement portion. By inserting or screwing connecting bolts into these aligned bolt holes, the base member can be fixed in the retracted position by bolting. When the base member of the rolling unit is positioned in the protruding position, the bolt holes constituting the other engagement receiving portion are aligned with the bolt holes constituting the engagement portion. By inserting or screwing connecting bolts into these aligned bolt holes, the base member can be fixed in the protruding position by bolting.

[0011] Preferably, the device frame is provided with a base guide that allows movement of the base member in the radial direction and restricts displacement in a direction perpendicular to the radial direction. By sliding the base member radially along the base guide, the base member can be repositioned between a retracted position and an extended position. When the base member is fixed to or released from the device frame at either the retracted or extended position, the base guide prevents the rolling unit from coming off the device frame. Therefore, for example, an operator does not need to attach or detach a connecting means such as a connecting bolt with one hand while supporting the rolling unit with the other hand. This further improves workability. [Effects of the Invention]

[0012] According to the present invention, it is possible to improve the workability when installing and removing the curl forming device on the reel. [Brief explanation of the drawings]

[0013] [Figure 1] Fig. 1(a) is a perspective view showing a state in which an annular wound body of a belt-shaped material is housed on a reel. Fig. 1(b) is a perspective view showing a state in which a curl forming device is set on the reel housing the annular wound body. Fig. 1(c) is a front cross-sectional view showing a state in which the belt-shaped material is used to rehabilitate an existing deteriorated pipeline after being curled by the curl forming device. [Figure 2] FIG. 2 is a front view showing the curl forming device set on a reel indicated by a two-dot chain line in the figure. [Figure 3] 3 is a side view of the curl forming device taken along line III-III in FIG. 2. FIG. [Figure 4] Fig. 4(a) is a front view showing one rolling unit of the curl forming device in a protruding position where it contacts the rotation guide of the reel. Fig. 4(b) is a front view showing the rolling unit in a retracted position. Fig. 4(c) is a front view of a base guide that guides the rolling unit in the device frame of the curl forming device. Fig. 4(d) is a front view of the rolling unit alone. [Figure 5]Fig. 5(a) is a side cross-sectional view taken along line Va-Va in Fig. 4(a), and Fig. 5(b) is a side cross-sectional view taken along line Vb-Vb in Fig. 4(b). [Figure 6] FIG. 6 is a bottom cross-sectional view taken along line VI-VI in FIG. 4(b). DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1(c) shows a construction site where an existing deteriorated pipeline 1 is being rehabilitated. The pipeline 1 is rehabilitated by lining the inner surface of the pipeline 1 with a rehabilitation pipe 9. In this embodiment, the pipeline 1 to be rehabilitated is a sewer pipe. Note that the pipeline to be rehabilitated is not limited to a sewer pipe, and may be a water pipe, a gas pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a tunnel, etc.

[0015] 1(c), the rehabilitation pipe 9 is a spiral pipe made from a long strip-shaped member (profile) 90. The strip-shaped member 90 is made of a synthetic resin such as polyvinyl chloride (PVC) and has a long strip shape with a predetermined cross section.

[0016] As shown in Figure 1(a), a strip-shaped member 90 before pipe making is wound and overlapped into a ring shape to form a ring-shaped annular wound body 91. As shown in Figures 1(a) and 1(b), the ring-shaped wound body 91 is held by being accommodated in a cylindrical reel 10. The reel 10 includes an outer peripheral frame 11 made up of a plurality of outer peripheral bars 13, and a pair of circular frames 12 with center holes provided at both axial ends of the outer peripheral frame 11. An annular rotation guide 14 is provided along the center hole 12c of the circular frame 12.

[0017] As shown in FIG. 1(c), a curling device 20 is installed in the center of the annular wound body 91 and the reel 10. The strip-shaped member 90 of the annular wound body 91 is sequentially unwound and introduced into the curling device 20. The curling device 20 imparts a curl (curvature) to the strip-shaped member 90. The curled strip-shaped member 90 is sent through a manhole 4 to the pipeline 1 to be rehabilitated, and is produced into a helical rehabilitated pipe 9 by a pipe making machine 3.

[0018] As shown in FIG. 1(b), the curl forming device 20 is detachable from the reel 10. As shown in FIGS. 2 and 3, the curl forming device 20 includes a curl forming unit 21 and a device frame 30. The curl forming unit 21 includes a pair of pinch rollers 22 and a drive motor 23, and forms a curl in the belt-shaped material 90 unwound from the annular wound body 91. The curl forming unit 21 is housed in the device frame 30.

[0019] The device frame 30 has a circular cylindrical frame shape and includes a plurality of outer peripheral frame members 31 and a pair of end face frame members 32 (end face portions). The axis of the device frame 30 coincides with the axis of the reel 10. Each outer peripheral frame member 31 is formed in a rod shape with its longitudinal direction directed in the axial direction of the device frame 30 (the direction perpendicular to the paper surface in FIG. 2, the left-right direction in FIG. 3). The plurality of outer peripheral frame members 31 (four in this example) are arranged in parallel and spaced apart from one another in the circumferential direction of the device frame 30. The curl former 21 is supported by the outer peripheral frame members 31 via slide support members 24 so as to be slidable in the axial direction of the device frame 30.

[0020] As shown in Figures 2 and 3, a pair of end face frame members 32 are provided at both axial ends of the device frame 30. Each end face frame member 32 is formed in an annular shape. The end of each outer peripheral frame member 31 is abutted against and connected to the end face frame member 32. The end face frame member 32 has a diameter slightly smaller than that of the rotation guide 14 and is arranged radially inward of the rotation guide 14 so as to fit along the rotation guide 14. A clearance 33 is formed between the outer peripheral edge of the end face frame member 32 and the inner peripheral edge of the rotation guide 14.

[0021] As shown in Fig. 2, the end face frame member 32 is provided with a plurality of base guides 34 (four in Fig. 2) spaced apart in the circumferential direction. As shown in Fig. 4(c), a pair of guide members 35 is provided at both ends of the base guide 34 in the circumferential direction (left-right direction in Fig. 4(c)). As shown in Fig. 6, the guide members 35 have an L-shaped cross section and protrude from the end face frame member 32, and face each other in the circumferential direction (left-right direction in Fig. 6). An insertion gap 35g is formed between each guide member 35 and the end face frame 32. A bolt hole 36 (engagement portion) for inserting a connecting bolt 50 is formed in each base guide 34, and ultimately in the device frame 30 (one of the members).

[0022] As shown in FIG. 2, four (plural) rolling units 40 are attached to the end face frame member 32. These rolling units 40 are arranged at intervals, preferably at equal intervals, around the circumferential direction of the end face frame member 32. As shown in FIG. 4(d), each rolling unit 40 includes a base member 41 and a rolling element 42. The base member 41 includes a bearing portion 43 and a pair of connecting plate portions 44. The rolling element 42 is rotatably supported by the bearing portion 43. As shown in FIG. 3, the rotation axis of the rolling element 42 is oriented in a direction parallel to the axis of the device frame 30 (the left-right direction in FIG. 3). As shown in FIG. 4(d), the rolling element 42 protrudes radially outward from the base member 41 of the device frame 30 (downward in FIG. 4(d)). As shown in FIG. 6, an annular fitting recess 42g is formed around the entire outer periphery of the outer surface of the rolling element 42.

[0023] As shown in FIG. 4(d), connecting plate portions 44 are provided on both ends of the base member 41 (the other member) across the bearing portion 43. Two bolt holes 45, 46 (engagement receiving portions) made of female threads are formed in the connecting plate portion 44. The two bolts 45, 46 are spaced apart from each other in the radial direction of the device frame 30 (the up-down direction in FIG. 4(d)). More specifically, the protruding position bolt hole 45 is positioned further inward in the radial direction of the device frame 40 (upper side in FIG. 4(d)) than the retracted position bolt hole 46. Female threads 45a, 46a that are threadedly engaged with the connecting bolt 50 are formed on the inner circumferential surfaces of the bolt holes 45, 46, respectively. The bolt holes 45, 46 may be replaced with bolt insertion holes having a larger diameter than the connecting bolt 50. In addition, as shown by the imaginary lines in Figure 6, the end face frame member 32 may be formed with a bolt insertion hole 32d that is aligned with the bolt hole 36.

[0024] As shown in FIG. 6, the rolling unit 40 is disposed between a pair of guide members 35 of the base guide 34. Connecting plate portions 44 at both ends of the base member 41 are inserted into the corresponding insertion gaps 35g. As a result, the base member 41 is permitted to move in the radial direction of the device frame 30 (the direction perpendicular to the paper surface in FIG. 6) by the base guide 34, while restricting displacement in two directions perpendicular to the radial direction, namely, the circumferential direction of the device frame 30 (the left-right direction in FIG. 6) and the axial direction (the up-down direction in FIG. 6). As shown in FIGS. 4 and 5, the base member 41 is permitted to move in the radial direction, so that it can be selectively disposed in a protruding position (FIGS. 4(a) and 5(a)) and a retracted position (FIGS. 4(b) and 5(b)) with respect to the device frame 30. Note that a stopper (not shown) may restrict the base member 41 from moving radially outward from the protruding position and from moving radially inward from the retracted position.

[0025] As shown in Fig. 4(a), when the base member 41 is in the protruding position, the protruding bolt hole 45 is aligned with the bolt hole 36. A connecting bolt 50 is inserted through the bolt hole 36 and is threaded into the female thread 45a, thereby fixing the base member 41 in the protruding position. When the protruding position bolt hole 45 is a bolt insertion hole, a connecting bolt 50 may be passed through the bolt insertion holes 36, 45, 32d and tightened with a nut 51 (see FIG. 6).

[0026] As shown in Fig. 5(a), when the base member 41 is in the protruding position, the rolling elements 42 protrude radially outward beyond the end face frame member 32, and the fitting recesses 42g fit into the rotation guide 14. This allows the rolling elements 42 to come into contact with the rotation guide 14 and roll along the rotation guide 14. As a result, the curl forming device 20 is installed relative to the reel 10 so as to be rotatable around the axis of the reel 10, as shown in Fig. 2.

[0027] As shown in Figure 5(b), the base member 41 in the retracted position is located radially inward (upper in Figure 5) of the device frame 30 compared to when it is in the extended position (Figure 5(a)). As shown in Figures 4(b) and 6, when the base member 41 is in the retracted position, the retracted position bolt hole 46 is aligned with the bolt hole 36. A connecting bolt 50 is inserted through the bolt hole 36 and is threaded into the female thread 46a. This fixes the base member 41 in the retracted position. When the retracted position bolt hole 46 is a bolt insertion hole, a connecting bolt 50 may be passed through the bolt insertion holes 36, 46, 32d and tightened with a nut 51, as shown in FIG.

[0028] As shown in Fig. 5(b), when the base member 41 is in the retracted position, the rolling elements 42 are retracted radially inward (upper side in Fig. 5(b)) of the device frame 30 from the position where they contact the rotary guide 14. Preferably, as shown in Fig. 4(b), the entire rolling unit 40 including the rolling elements 42 is retracted radially inward (upper side in Fig. 4(b)) from the outer periphery of the end face frame member 32. Therefore, the rolling elements 42 are not engaged with the rotary guide 14, and the curl forming device 20 is separated from the reel 10.

[0029] The curl forming device 20 is installed in the reel 10 as follows. Prior to the installation of the curl forming device 20, the annular wound body 91 is placed on the reel 10. That is, as shown by the two-dot chain line in Fig. 1(a), several outer peripheral bars 13 are removed from the reel 10 to secure an opening for loading and unloading, and the annular wound body 91 is housed inside the outer peripheral frame 11 through the opening, and then the outer peripheral bars 13 are attached to the opening.

[0030] Next, when installing the curl forming device 20 inside the reel 10, the base member 41 of the rolling unit 40 is set in the retracted position ( FIG. 4( b) ). The retracted position bolt hole 46 is aligned with the bolt hole 36, and a connecting bolt 50 is passed through and tightened into these bolt holes 36, 46. Then, while axially aligning the curl forming device 20 with the reel 10 ( FIG. 1( b) ), the curl forming device 20 is inserted through the rotary guide 14 into the annular wound body 91 and into the reel 10. At this time, as shown in FIGS. 4( b) and 5( b), the rolling elements 42 and therefore the rolling unit 40 are retracted radially inward from the outer periphery of the end face frame member 32, so that interference between the rolling elements 42 and the rotary guide 14 can be avoided. There is no need to remove each rolling unit 40 from the device frame 30 to avoid interference, and there is no need to carry each rolling unit 40 separately. The entire curl forming device 20 can be inserted into the reel 10 as a whole.

[0031] After inserting the curl forming device 20 into the reel 10, each rolling unit 40 is shifted radially outward from the device frame 30 to its protruding position (FIGS. 4(a) and 5(a)). This causes the rolling elements 42 to protrude radially outward from the device frame 30 and engage with the rotation guides 14.

[0032] Specifically, with the curl forming device 20 raised using a work machine (not shown), such as a forklift, the connecting bolt 50 of the lower rolling unit 40, which is in the retracted position, is removed. Next, the lower rolling unit 40 is moved from the retracted position to the extended position, and the inner peripheral edge of the rotation guide 14 is fitted into the fitting recess 42g of the lower rolling element 42, thereby engaging the lower rolling element 42 with the rotating element 14. By moving the lower rolling element 42 to the extended position, the extension bolt hole 45 is aligned with the bolt hole 36. The lower rolling unit 40 is fixed in the extended position by passing the connecting bolt 50 through these bolt holes 36, 45 and tightening it (FIG. 4(a)).

[0033] During the repositioning work of the lower rolling unit 40 to the protruding position, the rolling unit 40 is restricted by the base guide 34 so as not to move in the circumferential and axial directions of the device frame 30 (FIG. 6), so for example, an operator does not need to attach or detach the connecting bolt 50 with one hand while supporting the rolling unit 40 with the other hand to prevent it from moving. This makes the repositioning work easier. Next, the curling device 20 is lowered. The lower rolling element 42 may be engaged with the rotation guide 14 while the curling device 20 is being lowered. Next, the upper rolling unit 40 is similarly moved to the protruding position, and the rolling elements 42 of the upper rolling unit 40 are engaged with the rotation guide 14 .

[0034] Thereafter, as shown in FIG. 1(c), the strip-shaped member 90 constituting the annular wound body 91 is successively unwound from the reel 10, and after being given a curl by the curl-forming device 20, it is used to manufacture the rehabilitated pipe 9. When removing the curl forming device 20 from the reel 10 to replace the annular wound body 91 or the like, the procedure is carried out in reverse to that of installation. In this manner, the curl forming device 20 can be easily installed in and removed from the reel 10.

[0035] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, one engagement portion such as a bolt hole may be formed in the base member 41 (one of the members) of the rolling unit 40, and two engagement receiving portions such as bolt holes may be formed in the device frame 30 (the other member) spaced apart from each other in the radial direction of the device frame 30. One of the engaging portion and the engaging receiving portion may include a hook, and the other of the engaging portion and the engaging receiving portion may be an engaging hole with which the hook is engaged. [Industrial Applicability]

[0036] The present invention can be applied to, for example, the rehabilitation of deteriorated sewer pipes. [Explanation of symbols]

[0037] 1 Existing pipelines 3 Pipe making machine 9 Rehabilitation pipe 90 Belt-shaped member 91 Circular wound body 10 reels 12c center hole 14 Rotation guide 20 Curling device 21 Curl forming area 30 Device frame (one member) 32 End frame member (end face) 34 Base Guide 35 Guide member 36 Bolt hole (engagement part) 40 Rolling Unit 41 Base member (other member) 42 rolling elements 42g Recessed fitting 45 Bolt hole for protruding position (engagement receiving part) 46 Retracted position bolt hole (engagement receiving part) 50 connecting bolts

Claims

1. A curl forming device rotatably installed at the center of a cylindrical reel that holds an annular wound body formed by winding a belt-shaped member that will become a spiral tube into a circular shape, a cylindrical device frame; a curl forming unit that is housed in the device frame and forms a curl on the belt-shaped material unwound from the annular winding body; a plurality of rolling units provided at intervals in the circumferential direction of the end surface portion of the device frame; each rolling unit comprising: a base member selectively disposed with respect to the device frame at a protruding position and a retracted position radially inward of the device frame relative to the protruding position; a rolling element that is rotatably supported on the base member, that is in rolling contact with a circular rotation guide on the inner circumference of the reel when in the protruding position, and that retracts radially inward from the contact position when in the retracted position.

2. When in the protruding position, the rolling elements protrude radially outward from the end surface portion, 2. The curl forming device according to claim 1, wherein, when in the retracted position, the rolling elements are retracted radially inward from the outer periphery of the end surface portion.

3. an engaging portion is formed on one of the device frame and the base member; 2. The curl forming device according to claim 1, wherein the other of the device frame and the base member has two engagement receiving portions formed radially apart from each other and adapted to selectively engage with the engagement portion.

4. The curl forming device according to claim 3 , wherein the engaging portion and the two engaging receiving portions include bolt holes into which connecting bolts are inserted or screwed.

5. The curl forming device according to any one of claims 1 to 4, wherein the device frame is provided with a base guide that allows movement of the base member in the radial direction and restricts displacement in a direction perpendicular to the radial direction.

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