JPS6411366B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube clamping device for a bull block that continuously draws non-ferrous metal tubes.

In general, non-ferrous bull blocks are drawn by tightening the tube while winding it on a winding drum.When performing this drawing, the tip of the tube is first fixed at the bottom of the drum, and then the tube is drawn. , the subsequent tube is wound upwardly on the drum, and when a predetermined number of turns is reached, the tip of the tube is cut off, and the tube is successively dropped from the cut section into a receiving container arranged below the drum. By collecting it, continuous drawing was performed.

However, when the tip of the tube is cut off, the tube that has been wound tightly will cause a springback phenomenon, and the tip of the tube will come into contact with the drum guard installed on the outer periphery of the drum, resulting in damage to the tube. Otherwise, the tightening force of the tube loosens in the circumferential direction due to spring back, causing the drum and tube to slip in the circumferential direction, causing the tube to discontinuously bunch up and fall.
This has the problem of making continuous drawing itself impossible.

Conventionally, in order to deal with this problem, the drawing speed up to the time of cutting the tube was lowered.
Even so, the above-mentioned phenomenon occasionally occurred, and by lowering the drawing speed, the production efficiency was reduced.

The present invention has been made in view of the above-mentioned circumstances, and includes a gripper arm that can grip the tip of the tube on the bottom plate of the winding drum, and a tube cutter that is disposed downstream of the gripper arm in the rotational direction of the winding drum. In the bull block, at a position downstream in the rotational direction of the winding drum of the tube cutting machine, the claw side of a clamp arm provided with a claw at one end is movably passed through a tube winding start guide plate of the winding drum, and the clamp The other end of the arm was connected to a clamp cylinder attached to the bottom plate of the winding drum so that the tube could be clamped between the tube winding start guide plate and the claw part of the clamp arm by the operation of the clamp cylinder. This invention relates to a tube clamp device for a bull block characterized by the following.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the bottom of the winding drum in the bull block, and shows the bottom plate 2 of the winding drum 1.
(See Fig. 3), the end of a gripper arm 4 for gripping and temporarily fixing the tip of the tube 3 with its tip is pivotally attached, and the intermediate portion of the gripper arm 4 is attached to the rod of a rotating cylinder 5. It is connected at the end. Further, a tube cutter 6 is provided on the drum bottom plate 2 at a downstream position in the rotational direction of the drum 1. Furthermore, a clamping device 7 according to the present invention is provided downstream of the tube cutting machine 6.

As shown in FIGS. 2 and 3, the clamp device 7 of the present invention includes a clamp cylinder 8 connected to a pressure valve (not shown) and installed at a predetermined position on the drum bottom plate 2.
and a guide roller 12 which loosely passes through a guide plate 11 for starting tube winding, with the claw portion 9 side provided at the tip formed at the lower part of the drum side plate 10, and which is attached to the middle part.
Groove 14 of guide plate 13 vertically installed on drum bottom plate 2
The groove 14 has a slightly horizontal portion extending from the clamp cylinder 8 side toward the claw portion 9 side of the clamp arm 15. A rear upwardly inclined portion is formed to allow the clamp arm 15 to move from the position shown by the solid line to the position shown by the phantom line. Note that 16 is a rubber provided inside the claw portion 9 to prevent damage to the clamped tube 3, and 17 is a latch for holding the gripper arm 4 in a predetermined position.

In the above configuration, when drawing the tube 3, the rotation cylinder 5 is first driven to extend the rod and the gripper arm 4
is rotated to the position shown by the solid line in FIG. 1, and the tip of the tube 3 is gripped and fixed to the tip of the gripper arm 4. tube 3
After fixing the tip of the tube to the tip of the gripper arm 4, rotate the drum 1 (rotation direction Z) and move the following tube 3 from the X direction onto the guide plate 11 provided at the bottom of the drum side plate 10. 10 to make it easier to wrap around. At this time, by setting the rotating cylinder 5 in a free state, the gripper arm 4 is automatically drawn from the position shown by the solid line to the position shown by the imaginary line in FIG. The position is held.

In this state, the clamp arm 15 held in the position shown by the imaginary line in FIG.
is moved to the position shown by the solid line by contracting the rod of the clamp cylinder 8, and the tube 3 is clamped between the claw portion 9 of the clamp arm 15 and the guide plate 11 of the drum side plate 10. That is,
When the rod of the clamp cylinder 8 is extended, the guide roller 12 located in the middle of the clamp arm 15 is located in the inclined part of the groove 14 of the guide plate 13 fixed to the drum bottom plate 2, so that the clamp arm 15 is in the virtual line state and tube 3 cannot be clamped, but tube 3
When the rod of the clamp cylinder 8 is contracted after the rod is moved along the guide plate 11, the guide roller 12 sequentially moves from the sloped part of the groove 14 to the horizontal part, and the clamp arm 15 moves to the position shown by the solid line. The tube 3 can be clamped between the claw portion 9 of the arm 15 and the guide plate 11. At this time, in the present invention, since a horizontal portion is formed in the groove 14, the tube 3 can be reliably clamped regardless of the size of the tube diameter. The clamping force is adjusted by adjusting a pressure valve (not shown) connected to the clamp cylinder 8.

Thus, the tube 3 is held in a clamped state between the claw portion 9 of the clamp arm 15 and the guide plate 11, and the subsequent tubes 3 are sequentially wound upward and drawn. Then, when the number of turns of the tube 3 on the drum 1 reaches a predetermined number, the cutting machine 6 is activated. ) Cut the tip of tube 3. In this state, the tube 3 is still clamped by the main clamping device 7, and therefore remains wound around the drum 1. Thereafter, when the contracted rod of the clamp cylinder 8 is extended, the clamp arm 15 moves from the position shown by the solid line to the position shown by the imaginary line to release the clamp on the tube 3.
The tube 3 is not suddenly unclamped, but when the clamp arm 15 moves from the position shown by the solid line to the position shown by the imaginary line, the spring back force of the tube 3 itself (in this case, indicated by the arrow Y in FIG. 2) is applied to the tube 3. force in the direction and force in the circumferential direction), the claw portion 9
Therefore, the force on the tube 3 in the Y direction and the circumferential direction is gradually weakened. Then, when the clamp arm 15 is moved to release the locking by the claw portion 9, the tube 3 is released from the clamp. However, at this time, the springback force of the tube 3 has already been almost completely eliminated, so there is no risk of damage due to contact with the drum guard (not shown) installed around the outer periphery of the drum 1, or slippage between the tube 3 and the drum 1. This can be prevented, and the tube 3 is inevitably given a downward falling force (due to its own weight). Therefore, tube 3 is released almost at the same time as this clamp release.
It is continuously collected in a receiving container (not shown) provided below the drum 1, and at the same time the subsequent tube 3
are sequentially wound around the upper part of the drum 1 and can be continuously drawn.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the clamp arm may be provided with a groove or the guide plate may be provided with a guide roller, and various other changes may be made without departing from the gist of the present invention. Of course you can get it.

As described above, according to the present invention, (i) since the spring back force when cutting the tube can be eliminated, it is possible to prevent the entire winding drum from falling or breaking due to loosening of the tube;

(ii) Damage to the tube due to contact between the drum guard and the tube when cutting the tube can be prevented.

(iii) The above enables continuous drawing efficiency to be improved and high-speed cutting to be possible.

(iv) It has a simple structure and can be installed in a narrow space;
Also, maintenance and inspection are easy.

Demonstrates excellent effects such as

[Brief explanation of drawings]

FIG. 1 is a bottom plan view of a winding drum equipped with a tube clamp device of the present invention, FIG. 2 is a plan view of a tube clamp device of the present invention, and FIG.
It is a - arrow direction view of a figure. 1... Winding drum, 2... Drum bottom plate, 3...
...Tube, 8...Clamp cylinder, 9...Claw portion, 10...Drum side plate, 11...Guide plate, 12
... Guide roller, 13 ... Guide plate, 14 ...
Groove, 15...clamp arm.

Claims (1)

[Claims] 1. In a bull block, in which a gripper arm capable of gripping the tip of the tube is disposed on the bottom plate of the winding drum, and a tube cutting machine is disposed downstream of the gripper arm in the direction of rotation of the winding drum, the tube cutting machine rotates the winding drum. At a downstream position in the direction, the claw side of a clamp arm provided with a claw at one end is movably passed through a guide plate for starting tube winding of a winding drum, and the other end of the clamp arm is attached to a bottom plate of the winding drum. A tube clamp device for a bull block, characterized in that the tube is connected to an attached clamp cylinder so that the tube can be clamped between the tube winding start guide plate and the claw portion of the clamp arm by the operation of the clamp cylinder.