JPS58132411A - Pipe cutter unit - Google Patents

Abstract

PURPOSE:To make a pipe cutter unit into compact in size. by installing the only driving device of the pipe cutter unit in a casing, while interlocking circumferential rotation feed with radial infeed mechanically to cut off a pipe by a rotary cutter. CONSTITUTION:A motor 18 as the only driving device is firmly installed at the specified position of an outer casing 2. A pipe 7 is inserted into the within of a slide tube 8 through, projecting ahead from a rotary cutter 55 as far as the specified length, and chucked tight by a check 12. Rotation of the motor 18 is transmitted to the rotary cutter 55 via gears 22, 23, 29 and 31, thereby rotating the cutter 55, so that the cutter rotates at the same angular velocity as rotary spindles 27 and 27' around the pipe which is thus cut off.

Description

[Detailed Description of the Invention] The disclosed technology is a driving device for cutting metal pipes such as steel pipes to a specified length.
It belongs to the field of system simplification technology.

Therefore, in the invention of this application, a guide tube is provided in the center of the electrical casing of the device, and the inserted pipe is fixed and set using a clamp device provided at the end of the guide tube, and the pipe is fixedly set at the end of the guide tube. This invention relates to a pipe cutting device in which, when a rotary cutter rotates in the circumferential direction of the pipe through a rotation key by a drive device, a cut is made in the pipe by a radial feed device by a rotary drive device, In particular, only one drive device such as a motor is provided in the casing to drive a pair of gears, a circumferential gear and a radial feed gear, and the former gear meshes with a rotating spindle so that the rotating spindle drives a rotary cutter. is made to rotate around the pipe, and the latter is in gear meshing with an eccentric shaft, and the eccentric shaft is engaged with a slider of a rotary cutter that moves in radial displacement against the rotating spindle. Alternatively, the invention relates to a pipe cutting device d in which the radial feed gear is meshed with a shaft i having zero eccentricity so that a backup roller for rotating around the pipe can be rotated in opposition to the rotary cutter.

As is well known, metal pipes such as m-tubes are widely used as fluid transport piping, cable routing, and structural reinforcement members in all industries, but due to manufacturing convenience and transportation constraints, unit blue flame Therefore, depending on the use, connection via a joint or cutting to a standard size is performed.

Of these, the latter type of cutting is normally performed in one action, unlike fittings, so a unit-type pipe cutting and analysis device that has a clamp device and a cutter and a device to operate them is used. is common.

By the way, the general type of nuclide pipe cutting device in the United States uses two separate motors as power sources for feeding the rotary cutter in the circumferential direction and cutting in the radial direction ζ with respect to the set pipe.

Therefore, firstly, there are two adrenal glands that drive the pipe, and the cutting rate during one revolution of the rotary cutter around the pipe is unstable, leading to variations in cycle time and poor quality of the cut surface. This inconsistency leads to defects in product types and has the drawback of affecting the inertia of pipe toilet products.

In addition, the provision of two drive terminals has the disadvantage that the device becomes large and costly, and maintenance and inspection are also time-consuming.

The purpose of this invention is to solve the technical issue of the pipe cutting device based on the above-mentioned method, and to provide only one drive device in the casing to cut the pipe of the rotary cutter (in the opposite direction). The rotary feed and the radial cutting feed are mechanically interlocked to accurately correspond one-to-one and cut in a short time, making it compact and easy to operate, making it suitable for pipe cutting in industries that use pipes. It is an object of the present invention to provide a pipe cutting device that can be useful in the field.

The structure of this invention which meets the above-mentioned purpose is that a metal pipe is provided in the center of the casing of the cutting device, and is pushed into the inner tube so that its tip faces the rotary cutter for a predetermined length.
Activate the clamp device to tighten and fix the pipe at the end of the guide tube, and in this state, activate the driving device provided in the casing to rotate the circumferential gear and the cutting gear,
A rotating spindle that engages with the former gear is rotated around the pipe, and an eccentric shaft that engages with the latter gear is rotated at a set rotation ratio with respect to the rotating spindle. The rotary cutter is restrained from rotating in the circumferential direction by the rotary spindle, and cuts around the circumferential surface of the pipe.
As this rotates, it moves in the radial direction by the eccentric shaft, and therefore the via (in contrast, it is fed in the circumferential direction and in the cut to ensure cutting in one rotation, or
The gist of the mouth-tally cutter is that it takes technical measures to absorb the thrust load and to support the cutting reaction force from the backup roller ζ, which is pivotally supported on the rotating spindle. .

Next, embodiments of the invention of this application will be described below with reference to the drawings.

Embodiment 1 shown in FIGS. 1 to 4 (in this case, 1 is a pipe cutting Ig device which constitutes the gist of the invention of this introduction, and its casing is composed of an outer casing 2 and an inner casing 3).
The guide tube 8 of the pipe γ is fixed and extended through the outer casing 2 (the outer casing 2 is provided with a cap 51 and the bolt 6 is connected to the outer casing 2 with bolts 4, and a pipe-shaped rod 9 is mounted on the outer periphery of the outer casing 2). The front end of the inner casing 3 is made so that its tip cone surface comes into contact with and separates from a collet chuck 12 as a clamping device, which is provided through a front cap 11 fixed to the front end of the inner casing 3 via a bolt 10. A piston 14 is provided so as to be movable back and forth within a hydraulic cylinder 15 provided in the outer casing 2 and inner casing 3 by means of a threaded pedestal 13.

Note that 16 and 17 are hydraulic boats that are supplied with oil to a spool valve (not shown) via an oil supply/drain via.

Also, the predetermined position of the outer casing 2 is only 1.
A motor 18 as a drive device is fixedly installed, and a drive 111121 is fixed to its output shaft 19 via a key 20.
A circumferential direction feed gear 22 and a cut feed gear 23 are fixed to the holder via keys 24 and 25.

The former gear 22 meshes with a driven gear 29 provided via a key 28 to a rotating spindle 27 which is rotatably mounted on the inner casing 3 via a bearing 26, while the latter gear The gear 23 is loosely mounted on the outer periphery of the rotating spindle 27, and meshes with another driven gear 31 that is rotatably provided to the driven gear 23 via a thrust bearing 30.

The rotating spindle 27 has a front rotating spindle 27', which is divided into two parts due to the size of one set, which are integrally assembled with bolts 32 as shown in FIG.
In the figure, the load bolt 32 is only partially shown for convenience of illustration. ) Therefore, the rotating spindle 27, 27' is rotatably mounted to the inner casing 3i via the bearings 26, 33, 34, and to the outer casing 2 via the bearing 35. .

The bearing 34 of the rotary spindle 27' is preloaded by a spring 36 which takes a reaction force against the rotary spindle 27 so as to apply a sealing force to the seal 37.

The rotating spindle 27' has a bearing 38.
The eccentric shirts 1-39, 39 are arranged so as to be rotatable relative to each other via the rotary spindle 27.2''.
A pinion 41, which is rotatable around the pipe 7 together with the pinion 7' and is integrally provided at the rear end of each pinion concentrically via a key 4o, is connected to the internal gear 41i of the incision feeding driven gear 31. On the other hand, at the front end, an eccentric cam 42 protruding from the front end surface of the rotary spindle 27' is located at the center area of the eccentric shaft 39 and pinion 41 (the center line thereof is eccentric by a set eccentric amount a). ing.

It is designed so that twice the circumference, that is, 2a is larger than the thickness of the pipe 7 to be cut by 1+nyu.

Therefore, gears 22, 23, driven gear 29, 31°42
The gear ratio of the pinion 41 is set so that the cutting feed amount is approximately 0.025a, which is suitable for cutting, per one revolution of the rotary spindle 27'.

A bolt 43 is installed in front of the rotating spindle 27'.
A pair of slide plates 44, 44 are fixed via a radial notch 45 of each slide plate 44.
A slider 46 is mounted on the slider 46, and as shown in FIG. The i-silk cam 42, whose light passes through the slide plate 44, is mounted on a shaft via a bearing 49.

Therefore, the slider 46 rotates along with the rotary spindle 27' and moves forward and backward in the radial direction.

Three cutter holders 51 are fixedly attached to each of the sliders 46 (hereinafter referred to as cutter holders 51 via bolts 50).
A rotary cutter 55 is mounted on a bearing 54 provided to the cutter holder 51 via a reciprocating spring 53 for absorbing thrust load. In the above-described configuration, the slide tube 8 Push the pipe 7 through the inside to make the front part protrude from the collet chuck 12, extend the specified length beyond the rotary cutter 55, and attach the pressure oil boat 16 to the oil supply side. When hydraulic pressure is subsequently applied, the piston 14 moves rqM'lL against the cylinder 151, the front end of the rod 9 presses the collet chuck 12, and the collet chuck 12 clamps the pipe 7 firmly. Set state.

When the motor 18 is started, the gears 22 and 23 rotate, and the rotating spindles 27 and 27' rotate through the driven gears 29 and 31, and each eccentric shaft 3 rotates.
9.39 rotates 4 times.

Therefore, the slide plate 44 integrated with the rotating spindle 27' and the slider 46 whose movement is restrained by the slide plate 44 also rotate, and furthermore, the cutter holder 51 attached to the slider 46 also rotates. However, the rotary cutter 55 rotates around the pipe 7 at the same angular speed as the rotary spindles 27 and 27'.

On the other hand, since the eccentric shaft 39 rotates in mesh with the slave gear 31 at the set gear ratio, the eccentric cam 42 at its front end rotates the slider 46 with one eccentric center gravity a to the slide plate 44 in the radial/L< direction. As a result, the rotary cutter 55.55 comes into contact with the pipe 7 from the initial position, creating friction and changing the optimum cutting feed in the radial direction for one rotation of the rotating spindle 27'. The rotary cutter 55 cuts the pipe T along the cutting line 56 with a predetermined rotation of the rotary spindle 27', returns to its initial position with one rotation of the eccentric shaft 39, and finishes the cutting.

After cutting, the motor 18 is stopped and the boat 16.1 is
7, the piston 14 is moved back, the collet chuck 12 is loosened, the pipe 7 is moved forward by a predetermined distance, and the above-mentioned cutting step 1 is performed again.

During the cutting process, as shown in the figure, the edge of the rotary cutter 55 is tapered, so the collet chuck 12
A thrust force is applied between the fixed pipe 7 and the fixed pipe 7.

However, since the plate spring 53 is interposed between the bearing 54 of the shaft 52 and the cutter holder 51, the plate spring 53 acts as a cushion damper and absorbs the thrust force.

In the above embodiment, the rotary cutter 55 is used for the pipe 7.
A pair of rotary cutters 55 are provided centrally symmetrically, but in the case of an embodiment in which an odd number of rotary cutters 5rJ are provided, there is no support on the opposite side of the rotary cutter 55 to the pinoa.

Therefore, in the embodiment shown in FIG. 5, the roller holder 51 is connected to the rotary spindle 27' via the plate 44"F without providing an eccentric shaft on the rotary spindle 27' on the opposite side of the rotary cutter 55 or 1 m away from the rotary cutter 55. ', and the shaft 5
2'L The backup roller 57 is loosely supported against the pipe 7' so that it can be strained and cut.
To prevent distortion during cutting of pipe 7.

In addition, the embodiment of this invention is described in the above-mentioned q! r Example [
Of course, the present invention is not limited to this. For example, various embodiments can be adopted, such as making the eccentric weight of the eccentric cam of the eccentric shaft freely adjustable, or changing the diameter of the clamp device or the guide tube.

As mentioned above, the pipe cutting device according to the invention of this application basically has only one drive device installed in the casing, so the mechanism is extremely simple and the device can be made compact and compact. This reduces the cost, reduces maintenance costs, and reduces the number of failures.

Father, the rotating spindle for rotating the rotary cutter and the eccentric shaft for feeding the rotary cutter are provided in a gear meshed manner by a pair of gears connected to the drive device d, so that they are indirectly mechanically linked, and the pair of gears 1, the gear ratio can always be kept constant, and the cutting depth of the rotary cutter relative to the circumferential cutting of the pipe is constant, resulting in variations in cutting, cutting accuracy, and ultimately the type of product using the pipe. (Same as above) A loved effect is produced.

Since a pair of gears are provided in the drive unit and are connected to the rotating spindle and the eccentric shaft through gear meshing, the power is reliably divided, and because it is transmitted at the set gear ratio, it is always transmitted under the same conditions. There is a sac effect that can be cut.

Furthermore, a slider that can move in the radial direction is provided at the end of the rotating spindle, and the eccentric shaft is provided with a slider that can move in the radial direction. ! This has the effect that the amount of cut into the pipe can be guaranteed by electrical ratio θ5 as the rotary cutter rotates.

Furthermore, since the backup roller is provided on the opposite side of the pipe to face the rotary cutter, the roundness of the cut surface is maintained without distortion of the piezo caused by the rotary cutter l during cutting. This provides an excellent effect of preventing product defects and flaking.

[Brief explanation of the drawing]

The drawings are detailed explanatory diagrams of the invention of this application. Figure $1 is a sectional explanatory diagram of one embodiment, FIG. 2 is an explanatory diagram of a combination of rotating spindles, FIG. FIG. 4 is an explanatory view of the slider engagement of the eccentric shaft and eccentric cam, and FIG. 5 is a partial schematic explanatory view of another embodiment. 2.3...Casing, 7...Pipe, 8...
Guide tube, 9, 12... Clamp device, 5
5... Rotary cutter, 22.29, 27.27'... Orbiting device, 23.31
．． 41.39.44.46...Radial feed device, 1
8..., drive device, 1... pipe cutting device,
22.23...1 pair of gears, 27.2γ'...
Rotating spindle, 46...Slider, 39.
...Eccentric shaft, 57... Backup propeller procedural amendment (voluntary) March 16, 1980 Toki Shimada, Commissioner of the Japan Patent Office Indication of the case 1981 Patent Application No. 010965 2 Name of the invention Pipe Cutting device 3, relationship to the case of the person making the amendment Patent applicant address: 1-4 Toyota-cho, Toyota City, Aichi Prefecture
Rinto 105 Address 1-19-3 Nishi-Shinbashi, Minato-ku, Tokyo (2) Details page 9, line 1 [414 corrected to [41'J]

Claims (2)

[Claims] (1) A pipe insertion guide tube is provided in the center of the casing with a clamp device g, and a rotary cutter provided at the end of the casing is connected to a drive device via a circumferential device and a radial feed device. 1 In an analysis device, a pair of gears are connected to one drive device and ξ
One gear is in gear engagement with a rotating spindle, and the other gear is in gear engagement with an eccentric shaft that is connected to the rotary cutter and engages with a slider that is slidably provided in the radial direction at the end of the linear rotating spindle. A pipe cutting device characterized by being meshed. (2) A pipe insertion guide tube is provided in the center of the casing with a clamp device, and a rotary cutter provided at the end of the casing is connected to a drive device via a circumferential device and a radial feed device to cut the pipe. In the device, a pair of gears are connected to one drive device,
The one gear is in gear engagement with a rotating spindle, and the other gear is in gear engagement with an eccentric shaft that is connected to the rotary cutter and engages with a slider that is radially slidably provided at the end of the linear rotating spindle. A backup roller is provided at the end of the rotating spindle so as to be rotatable (pivotally supported and capable of abutting against the surface of the pipe 1IllI) in opposition to the rotary cutter. Pipe cut 11T #.