JP3908012B2 - Pipe cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube cutting device of a type that cuts an existing cable housing tube in which a cable is housed, for example, in the circumferential direction.
[0002]
[Prior art]
When a general electric tool is used as it is for this type of cutting work, it is difficult to adjust the cutting depth, and there is a risk of damaging the cable in the cable housing tube. It is also difficult to cut straight along the outer peripheral surface of the cable housing tube.
In order to overcome these problems, a dedicated cutting device for a cable housing pipe has been proposed. For example, a traveling unit capable of traveling along the outer periphery of the cable housing tube with an engine-driven cutting machine attached, a guide ring for guiding the traveling unit, and the traveling unit attached to the outer periphery of the tube. There is a dedicated device that combines chains for. In this apparatus, first, a guide ring is attached to the outer periphery of the cable housing tube to be cut, and the traveling unit is attached to the outer periphery of the cable housing tube by tightening the chain. Therefore, by rotating the cutting blade of the cutting machine mounted on the traveling unit, the traveling unit travels while being guided by the guide ring while cutting the tube with the cutting blade of the cutting machine.
[0003]
[Problems to be solved by the invention]
In this dedicated device, a chain and a guide ring are required to attach and hold the traveling unit on which the cutting machine is mounted to the outer periphery of the cable housing pipe and to guide the traveling of the traveling unit. Accordingly, the number of component parts of the apparatus increases, causing problems in preparation work for attaching the apparatus to the pipe. Moreover, since the whole apparatus is inevitably bulky, it is not suitable for cutting work in a narrow space.
The present invention seeks to solve the above-mentioned problems, and its purpose is to reduce the number of components of the cutting device, make it compact and facilitate preparatory work, and to be able to handle work in a narrow space. is there.
[0004]
[Means for Solving the Problems]
The present invention is for achieving the above object, and the invention according to claim 1 is characterized in that the pipe is moved in the circumferential direction along the outer peripheral surface of the pipe while driving the cutting blade. Is a tube cutting device of the type that cuts the outer periphery of the tube, and a traveling mechanism configured to be able to be mounted on the cutting machine and to travel on the outer circumferential surface of the tube in the circumferential direction includes a drive pulley and a driving pulley. And a driven pulley disposed on both sides of the driving pulley. A belt member that can be wound around the entire circumference of the pipe is wound around the outer side of the driving pulley and the inner side of the driven pulley in the traveling mechanism installed on the outer peripheral surface of the pipe, and is wound around the outer circumference of the pipe and tightened. It is configured.
According to this configuration, by rotating the driving pulley of the traveling mechanism while driving the cutting blade of the cutting machine, the traveling mechanism moves in the circumferential direction of the pipe in a fashion guided by the belt member together with the cutting machine. Accordingly, when the pipe is an existing cable housing pipe, the pipe can be cut in the circumferential direction without damaging the internal cable. The belt member has a function of attaching and holding the traveling mechanism to the outer periphery of the pipe and a function of guiding the traveling mechanism along the outer periphery of the pipe. Accordingly, it is possible to reduce the number of components, and the compact and easy preparation work can be performed, and the cutting work in a narrow space can be handled.
[0005]
The invention according to claim 2 is the pipe cutting device according to claim 1, wherein at least a pair of left and right belt members can be wound around the driving pulley and the driven pulley of the traveling mechanism. Further, tension adjusting means capable of automatically adjusting the tension of each belt member individually is provided.
Thereby, the tension change of each belt member is absorbed, the tension of each belt member is always kept equal, and the straightness of the traveling mechanism is ensured.
[0006]
A third aspect of the present invention is the pipe cutting device according to the second aspect, wherein the driven pulley of the traveling mechanism is individually arranged for each belt member. The tension adjusting means is configured by supporting these driven pulleys in a state in which an elastic force in a direction of pressing the driven pulleys against each belt member is applied.
Thereby, the function of the tension adjusting means can be obtained with a relatively simple structure.
[0007]
According to a fourth aspect of the present invention, in the pipe cutting device according to the first aspect, the traveling mechanism includes a rotation operation unit for manually rotating the drive pulley. The rotary operation unit can be remotely operated.
In this way, by manually rotating the driving pulley and moving the traveling mechanism along the outer peripheral surface of the pipe, the traveling mechanism is moved in accordance with the change in the cutting speed of the cutting machine due to the difference in the thickness of the pipe. be able to. Also, the operator can safely operate at a location away from the sparks generated when cutting the pipe.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 1 is an external perspective view showing a traveling mechanism 10 of the cutting device, FIG. 2 is a plan view showing the traveling mechanism 10 together with a cutting machine 60, and FIG. 3 is a front view of FIG. As shown in these drawings, the chassis structure 11 of the traveling mechanism 10 has a structure in which four plates 12 are coupled in parallel with a gap therebetween. The coupling means has a structure in which coupling bolts are inserted and tightened into pipe-like spacers 14 interposed between the plates 12 at a plurality of locations.
[0009]
In the spaces 16 and 17 on both the left and right sides of the space formed between the plates 12, the drive pulley 30 is disposed on the coaxial line at the approximate center. In both spaces 16 and 17, driven pulleys 36 and 37 are arranged on both sides of each drive pulley 30, respectively. Furthermore, a total of four needle rollers 46 are disposed in the spaces 16 and 17 on the outer sides of the driven pulleys 36 and 37, respectively. A belt member 70 is wound around the drive pulley 30, the driven pulleys 36 and 37, and the needle roller 46 in both spaces 16 and 17 as shown in FIG. 1.
[0010]
The drive pulleys 30 of both the spaces 16 and 17 are fixed to one main shaft 32, and the main shaft 32 is rotatably supported through the plates 12. On the other hand, the driven pulley 36 on one side in both spaces 16 and 17 is rotatably supported by each plate 12 through a shaft support block 38 of a tension adjusting means described later. In addition, about the other side driven pulley 37 in both the spaces 16 and 17, each or one axis | shaft is rotatably supported by each plate 12. As shown in FIG. The needle rollers 46 in both spaces 16 and 17 are rotatably supported on the same axis on the respective sides.
[0011]
FIG. 4 is a right side view of FIG. As is clear from this drawing, a rotation operation unit 20 is provided on one side surface of the chassis structure 11, that is, on the outer side surface of the plate 12 located on the rightmost side in FIGS. The rotation operation unit 20 includes a gear case 22 fixed to the plate 12, and a handle 24 is attached to the gear case 22 so as to be rotatable. A gear 28 is fixed to the handle shaft 26 of the handle 24 inside the gear case 22, and the gear 28 meshes with a gear 34 fixed to the main shaft 32 of the drive pulley 30 (FIGS. 3 and 4). Accordingly, the drive pulley 30 of both the spaces 16 and 17 is rotated together by the rotation operation of the handle 24.
[0012]
A mounting bracket 56 for mounting the cutting machine 60 is fixed to the other side surface of the chassis structure 11, that is, the outer surface of the plate 12 located on the leftmost side in FIGS. The mounting bracket 56 is provided with a bolt hole 58 for screwing the mounting bolt 68 (FIG. 1). In addition, traveling wheels 48 for traveling the traveling mechanism 10 are attached to the lower portion of the chassis structure 11 so as to be rotatable at a total of four locations, front and rear and left and right. Each traveling wheel 48 uses a roller having a V-shaped annular groove in order to ensure straight traveling of the traveling mechanism 10. At the design level of the traveling mechanism 10, the support shaft of each traveling wheel 48 and the support shaft of the needle roller 46 are combined.
[0013]
A connection portion 54 of a flexible shaft 52 extending from a remote operation handle 50 shown in FIGS. 2 and 4 can be connected to the handle 24 of the rotation operation portion 20. The drive pulley 30 can be rotated through the rotation operation unit 20 by rotating the remote operation handle 50 at a location away from the traveling mechanism 10.
[0014]
The cutting machine 60 is a commercially available electric type as shown in FIGS. 2 and 3, and a disc-shaped cutting blade 62 is rotationally driven by a motor built in a motor housing 64. The cutting machine 60 is provided with a support bracket 66 and a mounting bolt 68. The support bracket 66 can be set on the mounting bracket 56 of the traveling mechanism 10. The cutting machine 60 can be mounted on the traveling mechanism 10 by screwing the mounting bolt 68 into the bolt hole 58 of the mounting bracket 56 and tightening it.
[0015]
FIG. 5 is a schematic view showing the handling state of the belt member 70 with respect to the traveling mechanism 10 in correspondence with FIG. As shown in this drawing, the belt member 70 is wound around the driving pulley 30 having the highest axial position from the outside, and is wound around the driven pulleys 36 and 37 having a lower axial position than the driving pulley 30 from the inside. The needle roller 46 has the lowest axial position, and the belt member 70 is wound around from the outside. The driven pulley 36 on one side in the spaces 16 and 17 of the chassis structure 11 is pressed against the belt member 70 by the elastic force of the tension adjusting means.
[0016]
Regarding the configuration of the tension adjusting means, for example, as shown in FIG. 4, a shaft support block 38 that rotatably supports the shaft of the driven pulley 36 is received in the support hole 40 of the plate 12. This support hole 40 is long in the left-right direction of FIG. 4, and the shaft support block 38 can slide in the range. Further, an adjustment screw 42 is attached to the plate 12 so that the screwing amount can be adjusted, and a spring 44 is assembled between the end of the adjustment screw 42 and the shaft support block 38. The driven pulley 36 is pressed against the belt member 70 by the elastic force of the spring 44, and this pressing force can be adjusted by the screwing amount of the adjusting screw 42.
[0017]
Next, a procedure for cutting the pipe in the circumferential direction will be described. In addition, about a pipe | tube, the existing cable accommodation pipe | tube (a steel pipe or a hard vinyl pipe | tube) in which the cable is accommodated in the inside is demonstrated.
First, the belt member 70 using a lashing belt or the like is wound around the spaces 16 and 17 of the traveling mechanism 10 in the state described above. As shown in FIG. 5, the traveling mechanism 10 in the state where the two belt members 70 are passed is placed on the outer periphery of the cable housing tube P, and both belt members 70 are wound around the outer periphery of the cable housing tube P to be buckled ( Tighten with screws (not shown). As a result, the traveling mechanism 10 is attached to the outer periphery of the cable housing pipe P and is maintained in that state. The two belt members 70 are wound straightly in the circumferential direction, for example, by matching with a marking previously provided on the outer peripheral surface of the cable housing pipe P.
[0018]
Next, the support bracket 66 of the cutting machine 60 is set on the mounting bracket 56 of the traveling mechanism 10, and the mounting bolt 68 is tightened and mounted. Here, the cutting blade 62 of the cutting machine 60 is rotationally driven, and the cutting depth of the cutting blade 62 is adjusted while cutting the cable housing pipe P to determine the cutting depth. When this adjustment is completed, the remote control handle 50 is manually rotated to rotate the two drive pulleys 30 together. Thereby, based on the frictional resistance between the two drive pulleys 30 and the two belt members 70, the traveling mechanism 10 is guided by these belt members 70 and moves in the circumferential direction together with the cutting machine 60. Therefore, the cable housing pipe P is cut in the circumferential direction by the cutting blade 62 of the cutting machine 60 without damaging the internal cable.
[0019]
Since the belt member 70 has a buckle for tightening, the traveling mechanism 10 cannot pass therethrough. Therefore, once cutting has progressed to the vicinity of the buckle, it is necessary to temporarily stop driving the cutting machine 60 and shift the position of the buckle in the circumferential direction. In this operation, the belt member 70 is once tightened and then tightened again. However, the traveling state of the traveling mechanism 10 with respect to the cable housing pipe P is maintained by performing the two belt members 70 one by one. . When this operation is completed, the cutting blade 62 of the cutting machine 60 is driven to rotate, and the traveling mechanism 10 is moved to restart the cutting of the cable housing pipe P. When the cutting is completed, the driving of the cutting machine 60 is stopped, both belt members 70 are loosened, and the traveling mechanism 10 (including the cutting machine 60) is removed from the cable housing pipe P.
[0020]
In the cutting operation, the driven pulleys 36 and 37 and the needle roller 46 of the traveling mechanism 10 assist the frictional resistance between the driving pulley 30 and the belt member 70 effectively. Further, as described above, the pressing force by the springs 44 of the tension adjusting means is individually applied to the belt members 70 from the respective driven pulleys 36. Therefore, a change in tension generated in each belt member 70 during the cutting operation is absorbed by the elasticity of the spring 44, and the tension of each belt member 70 is always kept equal, and the straight traveling performance of the traveling mechanism 10 is ensured. In addition, the tension of the belt members 70 can be individually adjusted by the screwing amount of the adjusting screw 42.
[0021]
Since the belt member 70 using a lashing belt or the like can cope with the difference in the diameter of the cable housing pipe P, it is not necessary to prepare various sizes like a conventional guide ring, and only one type is sufficient. The belt member 70 of this type can be easily both passed through the traveling mechanism 10 and wound around the cable housing pipe P, and the workability is improved. Further, the lashing belt is dipped in a vinyl chloride resin liquid so that an appropriate hardness can be obtained. This also improves the straightness of the traveling mechanism 10.
[0022]
As described above, the traveling mechanism 10 is moved by rotating the driving pulley 30 by manual operation of the remote control handle 50. Therefore, unlike the conventional self-propelled cutting device, the cutting speed of the cutting machine 60 is reduced. Can respond to changes in Further, since the operator can operate at a position away from the cutting location of the cable housing pipe P, there is no possibility that the body will receive sparks or cutting powder generated when cutting the steel pipe or the like.
[0023]
The cutting machine 60 can be easily replaced simply by detaching the support bracket 66 from the mounting bracket 56 of the traveling mechanism 10. Therefore, for example, in the cutting operation in a work place where water is accumulated, the cutting operation can be safely performed while water is accumulated by exchanging the cutting machine 60 from the electric type to the air drive type. For this reason, the drainage operation in the cable housing pipe P can be omitted.
[0024]
FIG. 6 is a plan view showing the cutting device corresponding to FIG. 2 in a case where a countermeasure is taken when the pipe diameter is large, and FIG. 7 is a schematic view showing the right side of FIG. 6 corresponding to FIG. In these drawings, a base extension tool 80 is attached on the leading side in the moving direction of the traveling mechanism 10. The base extension tool 80 has a structure in which a hook 84 is formed on one side of a rectangular frame 82 and a traveling wheel 86 is provided on the other side.
[0025]
When the base extension tool 80 is used, the hook 84 of the frame 82 is coupled to the shaft of the traveling wheel 48 (the shaft of the needle roller 46) located on the leading side of the chassis structure 11. As a result, the traveling wheel 86 of the base extension tool 80 becomes the preceding traveling wheel in the chassis structure 11, and the wheel base of the traveling mechanism 10 is expanded. When the cable housing pipe P has a large diameter and a long circumferential distance, a deviation between the cutting start position and the end position is likely to occur. However, by using the base extension tool 80, the straightness of the traveling mechanism 10 is improved, and the deviation is prevented. Can be avoided.
In this embodiment, the pipe to be cut is not limited to the cable housing pipe P, and the material of the pipe is not limited to steel or hard vinyl, but can be variously selected depending on the ability of the cutting machine 60.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a traveling mechanism of a cutting device. FIG. 2 is a plan view showing the traveling mechanism together with a cutting machine. FIG. 3 is a front view of FIG. 5] Schematic diagram showing the handling state of the belt member with respect to the traveling mechanism in correspondence with FIG. 4. [FIG. 6] Plan view showing a countermeasure example when the pipe diameter is large in correspondence with FIG. Schematic diagram showing the right side of Fig. 5 corresponding to Fig. 5
DESCRIPTION OF SYMBOLS 10 Traveling mechanism 20 Rotation operation part 30 Drive pulley 36,37 Driven pulley 60 Cutting machine 62 Cutting blade 70 Belt member P Cable accommodation pipe (pipe)

Claims (4)

A tube cutting device of a type that cuts the tube in the circumferential direction by moving the cutting machine in the circumferential direction along the outer peripheral surface of the tube while driving the cutting blade. The travel mechanism configured to be capable of traveling in the circumferential direction on the outer peripheral surface of the pipe includes a drive pulley and driven pulleys disposed on both sides of the drive pulley, and can be wound around the entire circumference of the pipe. A pipe cutting device configured to wrap a possible belt member around an outer side of a driving pulley and an inner side of a driven pulley in a traveling mechanism installed on an outer peripheral surface of the pipe, and to wind and tighten the belt member around the outer circumference of the pipe. 2. The pipe cutting device according to claim 1, wherein at least a pair of left and right belt members can be wound around the driving pulley and the driven pulley of the traveling mechanism, and the tension of each belt member is individually set. A tube cutting device provided with tension adjusting means capable of automatically adjusting to the above. The tube cutting device according to claim 2, wherein the driven pulleys of the traveling mechanism are individually arranged for each belt member, and an elastic force is applied in a direction in which the driven pulleys are pressed against the respective belt members. A tube cutting device in which the tension adjusting means is configured by supporting the tube. The tube cutting device according to claim 1, wherein the traveling mechanism includes a rotation operation unit for manually rotating the drive pulley, and the rotation operation unit can be remotely operated. Pipe cutting device.

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