JPH0155928B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tube clamping device for a traveling cutting machine.

(Prior art and its problems) In electric resistance welded steel pipe manufacturing equipment, the tip of the tube produced at the tip of the coil has a tupular shape that is about 10% wider than the normal tube diameter.

In order to allow this part to pass through the inside of the tube clamp device, the conventional methods were to mechanically squeeze the wrapper-shaped tube end, or to use a tube clamp device with a margin when opened. .

In the former method, as shown in Fig. 3, the cone guide 2 squeezes the cone guide 2 to squeeze the cone-shaped portion 1 at the end of the steel pipe P that has expanded due to poor welding, and the pipe passes through the clamping device 3. was acting as a cause of the accident.

In the latter case, when the wedge body 5 is pulled out by the cylinder 4 and the clamp segment 3 is released in the direction of the arrow a in FIG. I made it easy to do. That is, the clamp stroke x (FIG. 3) of the clamp segment 3 was set sufficiently, and the inner diameter of the cone guide 2 was also widened to facilitate passage. With this structure, extra time is required when the clamp stroke x clamps a normal pipe, which is a major drawback for a traveling cutting machine that is required to shorten the time cycle as much as possible.

(Problems to be Solved by the Invention) To provide a pipe clamping device that can easily pass through the flap-shaped portion at the tip of the pipe without applying unreasonable force to the clamping device, and to minimize the time required to open and close the clamp segment. The present invention aims to provide a tube clamping device that can be clamped in a short period of time.

(Solution Means of the Invention) The opening position of the clamp segment expanded by the wedge body is set to two positions, ``open'' position and ``fully open'' position, and the clamp segment is opened and closed using a two-step action cylinder. I tried to let him do it. Then, in response to the tube advance signal from the coil tip, the clamp segment expands from the open position to the fully open position to allow the tube tip to pass through easily. The clamp segment was made to move to the open position upon receiving the signal.

(Embodiments of the invention) This will be explained with reference to FIG. A is a clamp device according to the present invention. Reference numeral 6 denotes clamp segments, and for example, four clamp segments are equally spaced on the circumference. The clamp segment 6 is fixed to an intermediate body 7 having an inclined surface on its rear outer side which engages with a wedge surface 9 of a wedge body 8.

The wedge body 8 is fixed to a frame body 11 with a nut 12 via a rod 10 fixed to one end thereof. The frame 11 is secured to a rod 14 of a two-stage hydraulic cylinder 13 mounted on a clamping device.

The hydraulic two-stage cylinder 13 has a large piston 13 inside.
a and the small piston 13b meet, and the small piston 13
b has a larger stroke, and by actuating this, the clamp segment 6 can be further opened from the open position to be fully opened. Since it is not necessary to fully open the clamp segment 6 when a normal pipe passes, except when the pipe end passes, the clamp segment 6 is opened and closed by the large piston 13a.

As an example of the two-stage hydraulic cylinder 13, the large piston has a stroke of 92 mm, and the small piston has a stroke of 160 mm. For normal opening and closing, the small piston uses a stroke of 68mm (=160-92).
From open to fully open, the large piston moves 92mm and the small piston moves 160mm. In other words, the large piston's stroke of 92 mm is fully opened when passing through the tip flap-like part, making it easier to pass through.

FIG. 2 is an example of a sequence in which the two-stage hydraulic cylinder 13 is opened, closed, and fully opened.

(Effects) Using a two-stage hydraulic cylinder, the clamp segment is fully opened only when passing through the tip of the flange-shaped part, and when clamping a normal pipe, a smaller stroke is required to open and close the clamp, reducing the time required for the clamping operation of the clamp device. This has greatly contributed to improving work efficiency.

By the way, the pipe diameter is 609.6mm, and the maximum diameter of the rattling part is 660mm.
Approximately mm. In addition, the clamp segment is 660mm when open and 720mm when fully open, and the clamping speed is
If it is 100mm/sec, then 720-660/2÷100=0.3(sec).

When fully open and when the normal tube is opened when clamped.
A time reduction of 0.3 seconds is possible. Furthermore, if opening is included, the reduction is 0.3 x 2 = 0.6 (sec), which shows that it greatly contributes to improving the operating rate of the plant.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a clamping device according to the present invention.
Figure 2 shows the sequence circuit of the same device. FIG. 3 is a cross-sectional view of a conventional pipe clamp device. FIG. 4 is a sectional view taken along the arrow in FIG. 3. In the figure; A... tube clamp device, 6... clamp segment, 7... intermediate plate, 8... wedge body,
9... Cuneate surface, 10... Rod, 11... Frame body, 1
2...Nut, 13...Hydraulic two-stage cylinder, 13
a...Large piston, 13b...Small piston, 14
...Lotsud.

Claims (1)

[Claims] 1. The opening positions of the clamp segment expanded by the wedge body are two positions, the "open" position and the "fully open" position, and the opening/closing operation to these two positions is performed by a two-stage cylinder. A pipe clamping device for a traveling cutting machine, characterized in that the pipe clamping device is operated by twisting the pipe. 2 In response to the tube advance signal from the coil tip, the clamp segment expands from the open position to the fully open position to allow the flap-shaped portion at the tube tip to pass easily, and when the flap-shaped portion passes through the clamp device, the tube tip passes through. 2. A pipe clamp device for a traveling cutting machine according to claim 1, wherein the clamp segment is moved to an open position upon receiving a signal.