JPS5927975Y2 - pipe gas cutting equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a gas cutting device for pipes of medium and large diameters, and in particular aims to accurately cut the pipes even if the pipes are bent or have poor roundness. That's what I said.

When pipes are manufactured continuously in electric resistance welding pipe manufacturing equipment, it is necessary to quickly collect and measure test pieces (for measuring pipe strength) after pipe manufacturing, and to feed back the measurement results to the welder.

Conventionally, gas cutting, bite cutting, emery saw cutting, and other devices have been used as cutting devices.

Among these, the cutting tool has the disadvantage that cutting time is too long, and to compensate for this, heavy-duty cutting devices have been developed today, but they are very expensive.

Further, due to the nature of the emery saw, emery saw cutting devices are suitable for small diameter pipes and are not suitable for cutting pipes of medium diameter or larger, and are not generally used.

Therefore, at present, gas cutting devices have generally been used to cut pipes of medium diameter or larger.

The conventional method is to cut by hand using a gas torch.

There has been an automatic cutting method in which a gas torch is rotated using power, but manual cutting methods have drawbacks such as the cut surface being uneven and requiring the operator to be highly skilled.

On the other hand, there are two automatic cutting methods: fixing the pipe, rotating the gas torch and rotating the gas torch, and fixing the gas torch.In the case of fixing the pipe and rotating the gas torch, the pipe is cut by rotating the gas torch based on the guide ring. , a chuck device is provided to align the centers of the pipe and the guide ring, but no countermeasures are taken against pipe eccentricity (poor roundness).

Therefore, if the amount of eccentricity becomes large, the distance between the pipe and the gas torch will vary depending on the cutting position, and the pipe may become unable to be cut.

In addition, in the case of pipe rotation and gas torch fixing methods, a strong chuck for rotating the pipe and a device such as a roller are required for supporting the chuck, which has disadvantages such as complicated and expensive equipment.

The present invention solves the problem of pipe bending, poor roundness, and reduction of equipment costs in gas cutting of pipes as described above.
Incorporating pipe fixation by tracing the pipe outer surface and gas torch rotation method, and in order to meet the recent demands for larger and thicker pipes, we mechanized specimen collection to ensure uniform cut surfaces and work safety. The purpose is to

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

Fig. 1 shows the entire test piece collection device, A is its plan view, B is its front view, C is its side view, and Fig. 2 is:
A detailed side view of the cutting device; FIG. 3 is a detailed sectional view of the cutting device.

In FIGS. 1A, B, and C, the pipe 1 made by the pipe making machine is carried out and accumulated on the transfer frame 2, and the pipe 1 is moved to the cutting position by the jumping arm 3. Jump in.

On the other hand, since the transport frame 2 at the cutting position is machined into a groove 2', the pipe core in the lateral direction (direction of line flow) is automatically determined as soon as it is located at the cutting position.

When the pipe is in the cutting position, the cutting device and child cart 16 (
The main cart 4 equipped with a sizing stopper forward extrusion device, receiving rod, and take-out frame device is inserted into the pipe 1 of the cutting device by the operation of the main cart operating cylinder 5, and the tip of the pipe 1 is placed on the sizing stopper plate. When it hits the attached deceleration sensor plate 6, the collision valve (hydraulic pressure) of the parent truck operating cylinder 5 is activated and the parent truck 4 is decelerated.

Subsequently, when the tip of the pipe 1 hits the final stage fixed-size stopper plate 7, the switching valve for the main bogie operating cylinder 5 is activated, the movement of the cylinder 5 is stopped, and the main bogie is stopped at a predetermined position.

When the parent cart 4 stops at the cutting position, the oil motor 11 moves the gas torch 8, guide roller 9, arm 10, etc.
is activated, thereby causing the arm 10 to rotate and the guide rollers 9 to touch the outer surface of the pipe 1.

When each guide roller 9 completes touching the outer surface of the pipe 1, each gas torch 8 is ignited at the same time (automatic ignition), and cutting begins.

The guide rollers 9 and the gas torch are installed in advance so that each guide roller is always the same.

Next, when the face plate rotation motor 13 is activated, the gas torch 8. Guide roller 9. A face plate to which the arm 10, oil motor 11, etc. are attached (a gear is provided on the outer periphery).

) 12 rotates and cutting of the pipe 1 begins. Meanwhile,
In order to prevent the guide roller 9 from leaving its touch even when the outer surface of the pipe 1 changes, a pressure reservoir is provided on the insertion pressure side of the oil motor 11 even when the switching valve of the oil motor 11 is turned off and rotation is stopped.

At the same time as the cutting of pipe 1 is completed, oil motor 11
is reversed, and the guide roller 9 is released from the pipe 1 and returned to its original position.

When the guide rollers 9 return to their original positions, the actuating cylinder 5 operates and the parent truck 4 moves backward.

At the same time, the face plate rotation motor 13 is also reversed, and the face plate 1
Return 2 to its original position (before cutting).

On the other hand, the cut test piece 1' is caught by the rod 14 and carried rearward by the parent truck 4 and the child truck 16.

When the movement of the subcarriage 16 is completed, the oil motor 17 for the test specimen take-out stand is activated, and the take-out stand 18 is moved to the position directly below the support rod 14.

Next, when the rearward movement of the parent cart 4 and the movement of the take-out stand 18 directly below the bar 14 are completed, the sizing stopper plate 7 is advanced via the test piece removal oil motor 19, and the test piece 1' The receiver pushes out from the rod 14.

The extruded test piece 1' is caught by a take-out stand and carried out from the rear of the stand by a crane or other means.

When the test piece 1' is pushed out from the support rod 14 and the movement of the rear part of the take-out stand is completed, the test piece removal oil motor 19
is reversed, and the sizing stopper plate 7 is moved backward to the position of the pipe cutting length (test piece length).

At the same time, the operation cylinder 15 of the subcarriage 16 is activated, and the subcarriage 16 moves forward to the pipe cutting length (test piece length) position.

On the other hand, the pipe 1 that has been completely cut is jumped out of the cutting position by the jump escape arm 3 after the rearward movement of the parent carriage 4 is completed, and at the same time, the next pipe 1 is jumped into the cutting position.

As described above, automatic and manual operation can be performed continuously with the series of steps as one cycle.

Next, with reference to FIGS. 2 and 3, details of countermeasures of the cutting device against pipe bending, eccentricity (poor roundness), etc. will be explained.

First, in FIGS. 2 and 3, the parent truck 4 is inserted, and the pipe 1 is inserted into the deceleration sensor plate 6 and the fixed size stopper plate 7.
When the tip hits, the parent carriage 4 stops (at the position of the pipe cutting length).

Next, when the parent truck 4 stops and the oil motor 11 starts operating, the chain wheel 20 on the oil motor shaft and the chain wheel 22 on the rotating shaft 21 at the rear end of each arm 10 are connected by a series of chains 23. , each guide roller 9 attached to the tip of the arm 10 and the gas torch 8 descend simultaneously.

At this time, if the pipe is bent or eccentric, the guide rollers 9 touch the outer surface of the pipe unevenly, resulting in uneven spacing between the gas torches and the outer surface of the pipe, resulting in poor cutting.

Therefore, in the present invention, the chain wheel 22 has a built-in torque limiter (or spring) 24 that slips (or buffers) when a torque exceeding a certain torque is applied, thereby eliminating the above-mentioned cutting failure. .

That is, the guide roller 9 that first touched the outer surface of the pipe is
The touch force is suppressed by the operation of the torque limiter (or spring) 24 built into the chain wheel 22, and this operation progresses in the order in which the guide rollers 9 are touched, and when all the guide rollers 9 are touched, the torque applied to the oil motor 11 is reduced. To maximize the oil motor 11, a pressure switch is installed on the insertion pressure side.
stop the rotation.

Next, when the rotation of the oil motor 11 is stopped and the ignition of each gas torch is completed, the face plate 12 to which each touch device, gas torch, and oil motor 11 are integrally attached is
is rotated by the face plate rotation motor 13 and starts cutting along the outer circumference of the pipe. However, if the pipe is bent or has poor roundness, the touch of the guide roller 9 may separate during cutting depending on the location, and the gas torch and pipe Since the distance from the outer surface varies, if a pressure reservoir is provided on the insertion pressure side of the oil motor 11 and tension is applied to the chain 23 during cutting, all guide rollers 9 will always touch the outer surface of the pipe and uniform cutting will be achieved. I can do it.

When the cutting is completed, the oil motor 11 reverses and returns the touch device (guide roller, arm shaft, etc.) and gas torch to their original positions.

At the same time, the face plate rotation motor 13 is also reversely rotated to return the face plate 12 to its original position.

On the other hand, the cut pipe (test piece 1') is received by the rod 14 and taken out via the take-out frame.

Other auxiliary mechanisms include a tension device 25 for the chain 23, a cutting device for changing the pipe size, a height adjusting device 26 for the cutting device main body, and a height adjusting device 27 for the sizing stopper plate 7 and deceleration sensor plate 6. establish.

The motor 13 for rotating the face plate is equipped with a continuously variable transmission in order to adjust the cutting speed depending on the wall thickness, material, etc. of the cutting pipe.
The oil motor 11 is of a piston type with less leakage.

Also, determine the length of the pipe, the position of the stopper plate, the insertion position of the parent trolley, etc.

Adjustments such as the backward movement position of the child cart, the take-out device, the start and end of cutting, etc. can be easily performed by adjusting the mounting position of the sensor, the hydraulic pressure setting, etc.

In other words, the pipe at the outlet of the pipe making machine has large bends and poor roundness, which is a major obstacle in today's automatic gas cutting. Therefore, in order to overcome this, the distance between the pipe outer surface and the gas torch must always be kept constant. It is a prerequisite for cutting that the

In order to satisfy this condition, the device of the present invention does not have a chuck on the pipe and is equipped with a pipe external surface reference tracing device that can sufficiently follow deformation of the pipe's external surface by touching the gas torch guide roller to the pipe's external surface. , the distance between the outer surface of the pipe and the gas torch can always be kept constant.

On the other hand, with recent rapid advances in welding technology, pipes are required to be larger and thicker, and the weight of test specimens is also increasing.

Therefore, safety and speed are required for specimen collection due to the increase in weight. It can be operated continuously in a one-touch manner, and has sufficient consideration for work safety and labor saving.

[Brief explanation of the drawing]

Fig. 1 shows the entire test piece collection device, A is its plan view, B is its front view, C is its side view, Fig. 2 is a detailed side view of the cutting device, and Fig. 3 is the cutting device. FIG. In the drawing, 1 is a pipe, 1' is a cut pipe (test piece), 2
is the transport frame, 2' is the ■groove, 3 is the jumping arm, 4 is the parent truck, 5 is the parent truck operating cylinder, 6 is the deceleration sensor plate, 7 is the fixed size stopper plate, 8 is the gas torch, 9 is the guide Roller, 10 is an arm, 11 is an oil motor, 12 is a face plate, 13 is a motor for rotating the face plate, 14 is a rod, 15
16 is a child car operation cylinder, 16 is a child car, 17 is an oil motor for the take-out stand, 18 is a take-out stand, 19 is a test piece removal oil motor, 20 is a chain wheel (for oil motor), 21 is a rotating shaft, 22 is a chain Car (for rotating shaft), 23
is a chain, 24 is a torque limiter (or spring), 25
2 is a tension device (chain) 26 is a cutting device main body height adjustment device, 27 is a sizing stopper plate and deceleration sensor height adjustment device.

Claims (1)

[Scope of utility model registration request] A plurality of arms are arranged in a link shape around the outer circumference of the pipe, a gas torch and a guide roller are provided at the tip, and a torque suppressing device and chain wheel are installed at the rear end to rotate the arm and suppress the contact force of the guide roller. A rotary shaft is attached, each chain wheel at the end of the rotary shaft is connected with a chain, one end of which is connected to a drive source, these are integrally installed on a face plate, and the face plate is rotated by a prime mover. A pipe gas cutting device featuring: