JPH08323532A - Guiding device for pipe cutter - Google Patents

Abstract

PURPOSE: To provide a guiding device for a pipe cutter capable of being made in a simplified structure with low cost, lessening contact resistance with a guide ring and making highly precise cutting work and groove work possible through realizing a complete rectilinear motion of a cutter body. CONSTITUTION: A bracket 18 is provided on one of the ends of a drive shaft 4 arranged on a cutter body 1 in a rotatable manner and a pair of roller bearings 20, 21 is provided on the bracket 18 for supporting freely rotatable rollers 19 at the lower end of the bracket 18. The interval between roller bearing 20, 21 is the interval of respective rollers 19 sandwiching a giude ring 22 fixed to the outer circumference of a pipe 31 and abutting on its both sides, while a roller fitting arm 27, which extends to the front and behind the proceeding direction of the cutter and has a freely rotatable roller 28 on its lower end, is provided on at least one of the roller bearings 20, 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutting machine used for cutting a pipe having a relatively large diameter at a construction site such as waterworks and civil engineering, in order to match the start end and the end of the cut end. The present invention relates to a guide device for a pipe cutting machine that enables a straight traveling of the cutting machine.

[0002]

2. Description of the Related Art The above-mentioned pipe cutting machine is, for example, Japanese Patent Publication Sho 59
It is disclosed in Japanese Patent Publication No. 9288. The pipe cutting machine includes a cutting machine body having a rotary cutter, a chain with rollers arranged around the pipe for installing the cutting machine body on the pipe to be cut, and a chain. Two sets, which are supported by a tensioning device, a guide ring fitted to the outer circumference of the pipe, and a bracket attached to a drive shaft and a chain adjusting shaft of the cutting machine, and which are arranged so as to come in contact with the guide ring so as to sandwich it from both sides. It consists of a pair of rollers.

In the pipe cutting machine having the above-mentioned structure, since the roller rolls into contact with the side surface of the guide ring, the cutting machine body travels straight following the guide ring without swinging to the left or right in the traveling direction. As a result, it is possible to prevent the occurrence of a step in which the start end and the end end of the cut end are displaced from each other to form a step.

By the way, in the above-mentioned guide device in the conventional pipe cutting machine, a pair of brackets are attached by slip fit to a drive shaft and a chain adjustment shaft, which are a part of the shaft of the cutting machine, and the respective mounting surfaces are attached. Fix the beam at a right angle, make an elongated hole on the longitudinal center line of the beam, and fix two elongated roller shafts in each of the elongated holes at a right angle to the beam with plain washers and nuts. At the position where the intersection of the extended center line of each roller shaft and the center of the pipe to be cut coincide with each other, fix the intersection of the long hole on the mounting surface of the bracket with tightening bolts, plain washers, and nuts. It is characterized by connecting two brackets and sandwiching a guide ring with two rollers that are slip-fitted to each roller shaft.

[0005]

As described above, the guide device in the conventional pipe cutting machine has a complicated structure for maintaining the roller shaft at an appropriate angle and reducing the contact resistance of the roller to the guide ring. Therefore, the manufacturing cost and labor required for that. Therefore, according to the present invention, it is possible to supply at a low cost with a simple structure, yet with a small contact resistance with respect to the guide ring, it is possible to realize complete straight running of the cutting machine body and perform highly accurate cutting work and groove cutting work. An object of the present invention is to provide a guide device for a pipe cutting machine.

[0006]

The present invention is a rotary cutter.
A pipe cutting machine which is installed on an outer peripheral surface of a pipe to be cut through a chain with rollers and performs a cutting operation while advancing along the outer peripheral surface of the pipe. A bracket is rotatably attached to one end of a drive shaft provided in the main body, and a pair of roller shafts that pivotally rotate freely rotating rollers are attached to the bracket at the lower end. Is a space between the guide ring fixed to the outer peripheral surface of the pipe and abutting the side surface thereof, and at least one of the roller shafts,
The above-mentioned problems are solved by a guide device in a pipe cutting machine, which is provided with a roller mounting arm having a roller that extends in the forward and backward direction of the cutting machine and that freely rotates at the lower end. The roller mounting arm is preferably provided on a cylindrical sleeve which is vertically movable with respect to the roller shaft and is fixed at a desired height.

[0007]

[Operation] The cutting machine goes straight along the guide ring through the bracket, roller shaft, and roller supported by the roller shaft.
At this time, since the pair of front and rear rollers attached to the roller attachment arm always contact the outer peripheral surface of the pipe, the axial direction of the roller shaft always coincides with the radial direction of the pipe. As a result, the roller of the roller shaft always maintains an appropriate contact relationship with the guide ring with a small frictional resistance, and thus a highly accurate guide is possible.

[0008]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a usage state of the device according to the present invention,
FIG. 2 is a perspective view of the main part thereof. In the figure, 1 is the cutting machine body,
A speed reduction mechanism and a clutch mechanism using gears are incorporated inside, and the input transmitted to the input shaft 2 is transmitted to the cutter shaft and the drive shaft 4 via these mechanisms.

The input shaft 2 is rotatably driven by power from an engine, a motor or the like via a flexible shaft 5. The rotation of the input shaft 2 is transmitted to the cutter shaft and the drive shaft 4 via the speed reduction mechanism, but the drive shaft 4 rotates at a low speed and the cutter shaft rotates at a considerably high speed. A diamond cutter for cutting the pipe 31 and a grinder for forming the groove 32 on the outer peripheral surface of the pipe are attached to the cutter shaft. Reference numeral 6 is a cover of a cutter and a grinder. A hose connector 7 for supplying cooling wash water is fixed to the cover 6.

The drive shaft 4 extends on both sides of the cutting machine body 1, and a driving wheel 8 is fixed to each end. Further, a driven shaft 10 which rotatably supports the driven wheel 9 is arranged at both ends in parallel with the drive shaft 4, and an endless belt 11 is wound between each driving wheel 8 and the driven wheel 9. The endless belt 11 is tensioned by being pulled by the chain 12 with a roller as described below, and the lower side of the endless belt 11 is in pressure contact with the outer peripheral surface of the pipe 31.

The chain 12 with rollers is formed by connecting a roller shaft 14 having rollers 13 which freely rotate on both sides, one end of which is a cutting machine body. It is fixed to one lower end of one of the inverted U-shaped arms 15 and 16 arranged on both sides of 1. Also, a chain with a roller
The other end of the shaft 12 is passed under the pipe 31 and turned to the opposite side along the outer peripheral surface of the pipe, and is fixed to the driven shaft 10. That is, the male screw rod 17 screwed into the driven shaft 10 is screwed into the roller shaft at the endmost end to be connected to the driven shaft 10, and the driven shaft 10 and the drive shaft 4 are connected by the endless belt 11. Be connected. Thus, the chain 12 with rollers is wound around the pipe 31. The tightness of the chain 12 with rollers to the pipe 31 can be adjusted by adjusting the amount of screwing of the male screw rod 17. By tightening the chain 12 with rollers, the endless belt 11 is pressed onto the outer peripheral surface of the pipe.

The other lower ends of the arms 15 and 16 are rotatably attached to the drive shaft 4. Therefore, the arms 15 and 16 are connected to the pipe 31 to rotate, and the roller shaft 1 of the roller at the end of the chain 12 with rollers.
4a and the drive shaft 4 of the prime mover 8, and the arms 15, 1
The cutting machine body 1 located between 6 is supported by being floated from the outer peripheral surface of the pipe.

Reference numeral 18 denotes a bracket rotatably attached to one end of the drive shaft 4, to which a roller 19 is provided at the lower end.
A pair of roller shafts 20 and 21 that pivotally support is installed.
The distance between the roller shafts 20 and 21 is set so that each roller 19 abuts the side surface of the guide ring 22 located between them. The guide ring 22 is composed of two semi-circular members connected by a hinge, and can be fixed at a desired position of the pipe 31 by bolting the open ends of the latter circular member surrounding the pipe 31. It is like this.

A cylindrical sleeve 24 is vertically movably installed on at least one of the roller shafts 20 and 21 (usually outside). That is, the sleeve 24 is arranged between the bracket 18 and the roller 19, and can be moved up and down when the thumbscrew 25 is loosened, and can be fixed at a desired height by tightening it. It has become. Roller mounting arms 26 and 27 are provided on the front and rear side surfaces of the sleeve 24, that is, on the front and rear side surfaces in the traveling direction of the cutting machine body 1. Each roller mounting arm 26 and 27 has a roller 28 at its lower end. I support you. The fixed position of the sleeve 24 can be changed according to the diameter of the pipe 31, so that the contact position of the roller 19 with the side surface of the guide ring 22 can be adjusted.

The pipe cutting machine equipped with the guide device having the above-described structure is installed and used on the pipe to be cut. At the time of installation, first, the guide ring 22 is fixed at a predetermined distance from the position to be cut. Then, the cutting machine body 1 and each part attached thereto are placed on the pipe 31 so that the two rollers 19, 19 are in contact with the ring side surfaces on both sides of the guide ring 22, and the chain with the roller is attached. 12 is wound around the pipe 31, and the roller shaft 1 of the end portion on the release end side is wound.
The male threaded portion 4 is screwed with the male screw rod 17 screwed into the driven shaft 10 to connect the end portions. Thus, the endless belt 11 is tensioned, and the lower side of the endless belt 11 comes into close contact with the outer peripheral surface of the pipe, and the two rollers 28, 28 contact the outer peripheral surface of the pipe 31.

When rotational power is input to the input shaft 2, the cutter shaft rotates at a high speed to start the cutting operation by the cutter and the groove cutting operation by the grinder. On the other hand, the drive shaft 4 is driven to rotate at a low speed, and the prime mover 8 rotates slowly. The prime mover 8 rotates by striking the endless belt 11 that is in close contact with the pipe 31. As a result, the endless belt 1
1, the cutting machine slowly moves forward, and the cutting and grooving operations also gradually proceed. At that time, the cutting machine follows the guide ring 22 via the rollers 19 and 19, so that the cut end is an ideal one in which the start end and the end end coincide.

By the way, in the guide device according to the present invention, the roller 2 is moved forward and backward through the roller mounting arms 26 and 27 on the roller shaft 20.
8 and 28 are provided. Since the rollers 28 and 28 are always in pressure contact with the outer peripheral surface of the pipe 31 and freely rotate, the bracket 18 is prevented from swinging due to the rotation of the drive shaft 4 and the vibration of the cutting machine. Therefore, the axial direction of the roller shafts 20 and 21 always coincides with the radial direction of the guide ring 22, and the rollers 19 and 19 always keep contact with the side surface of the guide ring 22 with proper low friction, so that the cutting is performed. Make the aircraft go straight more reliably.

[0018]

As described above, the present invention has a pair of front and rear rollers that rotate by contacting the outer peripheral surface of the pipe on the roller shaft of the roller that rotates in contact with the guide ring. Since there is no rocking of the roller shaft, it is possible to provide a stable and reliable guide for straight running of the cutting machine, the structure is simple and easy to handle, and the effect that can be provided at low cost There is.

[Brief description of drawings]

FIG. 1 is a perspective view showing a usage state of an embodiment of the present invention.

FIG. 2 is a perspective view of an essential part of an embodiment of the present invention.

[Explanation of symbols]

 1 Cutting machine main body 2 Input shaft 4 Drive shaft 8 Driving car 9 Driven car 11 Endless belt 18 Bracket 19 Roller 20 Roller shaft 21 Roller shaft 24 Sleeve 26 Roller mounting arm 27 Roller mounting arm 28 Roller

Claims (2)

[Claims] 1. A rotary cutter, which is installed on an outer peripheral surface of a pipe to be cut through a chain with a roller, and performs a cutting operation while advancing along the outer peripheral surface of the pipe. In a pipe cutting machine to perform, a bracket is rotatably attached to one end of a drive shaft provided in the cutting machine body, and a pair of roller shafts that pivotally rotate freely rotating rollers are attached to the bracket at the lower end. The interval between
The guide rings fixed to the outer peripheral surface of the pipe are sandwiched between the rollers and abutted against the side surfaces thereof, and at least one of the roller shafts extends in the front-rear direction of the cutting machine and freely rotates to the lower end. A guide device in a pipe cutting machine provided with a roller mounting arm provided with a roller. 2. The pipe cutting machine according to claim 1, wherein the roller mounting arm is provided on a cylindrical sleeve installed so as to be vertically movable with respect to the roller shaft and fixed at a desired height. Guidance device in.