JPS6243603Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an uncoiler for a pipe making device.

First, the outline of the pipe-making apparatus will be explained with reference to FIG. In the figure, 1 is a strip material 2 made of steel plate.
With the uncoiler wrapped with
Here, the strip material 2 having a flat plate-like cross section is gradually formed into a circular tube shape. Next, the edges of the strip material 2 are heated by a heating device 7, and the heated edges are further pressed and welded by a squeeze roll 8 to form a complete circular tube. Further, this welded portion is cooled by a cooling device 9, and then the weld bead protruding from the outer circumference of the tube is cut by a bead cutting machine 10, so that the outer circumference of the tube is finished into a uniform curved surface. Next, the tube passes through a group of sizing rolls 11 consisting of vertical rolls 4 and horizontal rolls 5, where the tube is formed into a perfect circle and the tube dimensions are formed to a predetermined value. The product is cut into a predetermined length by a cutting machine 12. Incidentally, a larger number of vertical rolls 4 and horizontal rolls 5 are actually provided.

However, in pipe-making equipment, especially for ultra-thin-walled pipes, the higher the accuracy of butting the edges of the strip material 2 at the weld, the better the product can be obtained, and one of the factors that influences this butting accuracy is the There is a tension applied to the strip material 2, and in order to improve the matching accuracy, it is necessary to optimally adjust the tension applied to the strip material 2. However, the conventional uncoiler 1 is only equipped with a brake to stop rotation, but cannot adjust the tension.When adjusting the tension, a separate tension adjustment device is installed, and the The equipment was expensive and required a large amount of installation space. In addition, the uncoiler 1 is equipped with a reel wrapped with the strip material 2 currently in use and a replacement reel, but the replacement reel cannot be operated because the brake cannot be manually operated while the pipe making equipment is in operation. It was not possible to attach the inner band-shaped material, and the time required for pipe-making increased because the pipe-making work was normally carried out by one worker.

The present invention eliminates the above drawbacks, and in addition to braking to stop rotation, it is possible to freely adjust the tension of the strip material, and does not require a special tension adjustment device.
It is an object of the present invention to provide an uncoiler for a pipe making apparatus that can shorten the pipe making time by allowing the strip material to be attached to the reel on the non-supply side of the strip material while the pipe making apparatus is in operation.

Embodiments of the present invention will be described below with reference to the drawings.
2A and 2B show a plan view and a front view, respectively, of the uncoiler 13 according to the present embodiment. Reference numeral 14 denotes a support base, and a mounting base 15 is supported on the support base 14 so as to be rotatable in the horizontal direction. A first reel 16 on the supply side and a second reel 17 on the non-supply side for supplying the strip material 2 to the pipe-making line are rotatably disposed on the reel 15 symmetrically with respect to the center of rotation O. Ru. The rotating shafts 16a, 17a of each reel 16, 17 are provided with a pair of bearings 18, 19 on the mounting base 15, respectively.
is rotatably supported by the rotating shafts 16a, 17.
First and second powder brakes 20 and 21 respectively mounted on a mounting base 15 are connected to a. The powder brakes 20 and 21 are brakes whose braking force changes depending on the excitation current. The strip material 2 is wound around the first reel 16 on the supply side. Further, first and second limit switches LSA and LSB are attached to the side of the mounting base 15 in a symmetrical arrangement with respect to the rotation center O, and the support base 1
4 is formed with a limit switch input portion 14a that closes the limit switch LSA, LSB located on the supply side. Further, reference numerals 22 and 23 are switch mounting members attached to the sides of the mounting plate 15 in a symmetrical arrangement with respect to the rotation center O, and the switch mounting member 22 has a first automatic manual changeover switch.
COSA1 and the first braking state changeover switch COSA2 are installed, and the switch mounting member 23
There is a second automatic/manual changeover switch COSB1.
and a second braking state changeover switch COSB
2 is installed. As a result, reel 16,
COSA1, COSA2 and LSA are located on the supply side of the strip material 2, and the reel 17, COSB1,
COSB2 and LSB are located on the non-supply side.

FIG. 3 shows the brake control circuit in the uncoiler 13, R and S are power terminals, 24 and 25 are power boxes for the powder brakes 20 and 21 connected to the power terminals R and S, respectively, 26 to 29 are variable resistors,
30 to 37 are respective relays, 38 and 39 are contacts for stop commands, and a series circuit of the variable resistors 26 and 27 and the normally open contact 32a of the relay 32 and a parallel circuit of the normally open contact 33a of the relay 33 are connected to the power supply box 24. and the first powder brake 20, and the variable resistor 2
8, 29 and the normally open contact 36a of the relay 36, and a parallel circuit consisting of the normally open contact 37a of the relay 37 are provided between the power supply box 25 and the second powder brake 21.

Next, brake control of the uncoiler 13 having the above configuration will be explained. First, in the state shown in FIG. 2, the limit switch LSA is pressed by the limit switch input part 14a of the support base 14 and is in the closed state, and the relay 30 is energized and its normally open contacts 30a to 30c are closed. At the same time, the normally closed contacts 30d to 30f are open. Here, when the changeover switch COSA1 is switched to the automatic side, the relay 31 is energized and its normally open contact 31a is closed. Therefore, the relay 32 is energized, its normally open contact 32a is closed, and the first powder brake 20 is energized. However, variable resistor 26,2
7, the excitation current of the powder brake 20 is relatively small, and the powder brake 20 enters a weak braking state. Therefore, by adjusting the resistance values of the variable resistors 26 and 27, an optimum tension can be applied to the strip material 2 being stretched by the guide roll 3 and the forming roll group 6. Also, the changeover switch
When COSA1 is switched to manual side, the changeover switch
By switching COSA2, the powder brake 20 can be switched to a non-braking state, a weak braking state, and a forced braking state. That is, when the changeover switch COSA2 is set to ``off'', the powder brake 20 is not energized and is in a non-braking state, and when the changeover switch COSA2 is set to ``weak'', the relay 32 is energized and the powder brake 20 is placed in a weak braking state as described above. becomes.
In addition, when the changeover switch COSA2 is set to "strong", the relay 33 is energized, its normally open contact 33a is closed, the power supply box 24 and the powder brake 20 are connected without a resistor, and the powder brake 20 receives the exciting current. Reel 16 reaches maximum and enters forced operation state
rotation is stopped. This manual operation can be utilized when first attaching the tip of the strip-shaped material 2 to the guide roll 3, etc., and when repairing and inspecting the pipe-making apparatus. or,
When the stop command contact 38 is closed, the powder brake 20 is immediately forced to operate due to the excitation of the relay 33, and the rotation of the reel 16 is stopped.

On the other hand, on the non-supply side, the second limit switch
Since LSB is open, the relay 34 is not energized and its normally closed contact 34d is closed, and its normally open contact 30c is also closed. For this reason, the changeover switch COSB
If switch 2 is set to "off", the powder brake 21 will be in a non-braking state and the second reel 17 will be free to rotate; if switch CCSB2 is set to "weak", relay 36 will be turned on.
When the changeover switch COSB2 is set to "strong", the normally open contact 36a is closed by the excitation of the relay 37, and the powder brake 21 is in the forced braking state. becomes. Therefore, reel 16
Even when the pipe making equipment is automatically operated by supplying the strip material 2 from It is possible to wind the strip material 2 and prevent it from unwinding. In addition, normally closed contact 3
4d and the normally open contact 30c, the same operation can be performed by switching the changeover switch COSB1 to the manual side.

Next, when all the strip material 2 wound around the reel 16 is used up, the mounting base 15 is rotated 180 degrees to reverse the supply side and the non-supply side. During reversal, limit switches LSA and LSB are both open, but relay 3
Since the normally closed contacts 30f and 34e of 0 and 34 are both closed, the relay 36 is energized, the powder brake 21 is in a weak braking state, and the strip material 2 wound around the reel 17 does not unwind.

When the reversal of the mounting base 15 is completed, the reel 17 becomes the supply side, and the reel 16 becomes the non-supply side. In this case, the limit switch LSB is pressed and closed by the limit switch input part 14a of the support base 14, and the relay 34 is energized and its normally open contact 34 is closed.
When a to 34c are closed, normally closed contacts 34d to
34f is open. Here, if the changeover switch COSB1 is switched to the automatic side after the tip of the strip material 2 wound around the reel 17 is attached to the guide roll 3, the relay 35 is energized and its normally open contact 35 is turned on.
a is closed, the normally open contact 36a is closed by the excitation of the relay 36, and the powder brake 21 is placed in a weak braking state. Therefore, by adjusting the variable resistors 28 and 29, the strip-shaped material 2 is stretched toward the pipe-making line.
can provide optimal tension. Also, if you change the changeover switch COSB2 to the manual side, you can change the changeover switch COSB2 to "off" or "low" in the same way as described above.
Powder brake 2 by switching to "strong"
1 can be switched to a non-braking state, a weak braking state, and a forced braking state, respectively. Furthermore, if the stop command contact 39 is closed, the powder brake 21 can be forced to operate by energizing the relay 37.
Rotation of the reel 17 can be stopped immediately.

On the other hand, reel 16 which became the non-supply side due to reversal
On the side, normally closed contact 30d and normally open contact 3
4c are both closed, the braking force of the powder brake 20 can be adjusted by switching the changeover switch COSA2 as described above, and the reel 17
During the operation of the pipe making equipment as a supply side, the reel 16
The belt-like material can be attached to the belt. Even when the series circuit of the normally closed contact 30d and the normally open contact 34c is not provided, the same operation can be performed by switching the changeover switch COSA1 to the manual side. In addition, when reversing the reel 16 to the supply side, both limit switches LSA and LSB are opened, but since the normally closed contacts 30e and 34f are both closed, the powder brake 20 is in a weak braking state due to the excitation of the relay 32. This makes it possible to prevent the strip material attached to the reel 16 from unwinding.

In the above embodiment, each limit switch
LSA and LSB are provided to automatically detect which of the reels 16 and 17 is on the supply side, making it easier to operate.
The LSB, each relay 30, 34, and their contacts do not necessarily need to be provided.

As described above, in the uncoiler of the pipe making apparatus according to the present invention, the first and second reels which alternately serve as the supply side and non-supply side of the strip material are rotatably provided, and the first and second reels are rotatably provided. A first powder brake and a second powder brake are connected to each of the powder brakes, and each powder brake can be switched between a forced braking state in which the rotation of the reel is stopped and a weak braking state in which the braking force can be adjusted. First and second automatic/manual changeover switches are provided that put the first and second powder brakes in a weak braking state, respectively, and by switching the changeover switches to the automatic side, powder brakes are applied to brake the reel on the supply side. Put the brakes into a weak braking state with adjustable braking force,
This makes it possible to apply optimal tension to the strip-shaped material that is wound on the reel on the supply side and is pulled toward the pipe-making line during automatic operation of the pipe-making apparatus. For this reason, when forming a strip material into a tube shape, the precision of matching the edges is improved, making it possible to produce high-quality tubes.There is also no need for a special tension adjustment device, making the tube-making equipment inexpensive and easy to install. It can be made into a small one. Further, when the first and second automatic manual switching switches are switched to the manual side, the first powder brake and the second powder brake can be switched to a non-braking state, a weak braking state, and a forced operating state, respectively. A second braking state switching switch is provided, and by switching the automatic manual switching switch to the manual side and switching the braking state switching switch during automatic operation of the pipe making equipment, the reel on the non-supply side can be switched. can be placed in a non-braking state, a weak braking state, and a forced operating state, thereby making it possible to wind the strip conductor onto the reel on the non-supply side and prevent the wound strip conductor from unwinding. Tubing time can be shortened.

The effects of such an uncoiler can be summarized as follows. During pipe making, by slightly braking the reel on the supply side, the occurrence of slack in the strip material is prevented and proper pipe making is performed. In particular, if the strip material is extremely thin, it is likely to break if a sudden pulling force is applied when the strip material becomes slack, and if the supply reel is forcibly moved, the strip material will stretch and become Therefore, the effect of the uncoiler according to the present invention is remarkable. Also,
When attaching the tip of the strip-shaped material wound on the reel on the supply side to a guide roll or the like, or when repairing or inspecting the pipe-making device, the reel can be forced into operation. Furthermore, winding of the strip material onto the reel on the non-supply side can be carried out without braking the reel, and when the mount rotates, the reel is automatically lightly braked to prevent the strip material from unwinding.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the pipe making equipment, Figure 2 A and B
FIG. 3 is a plan view and a front view of an uncoiler of a pipe-making apparatus according to the present invention, respectively, and FIG. 3 is a control circuit diagram of each powder brake in the uncoiler according to the present invention. 2... Strip material, 3... Guide roll, 6...
Forming roll group, 7... Heating device, 8... Squeeze roll, 13... Uncoiler, 15... Mounting stand, 16... First reel, 17... Second reel, 18, 19... Bearing, 20...first powder brake, 21...second powder brake,
24, 25...Power supply box, 26-29...Variable resistor, 31-33, 35-37...Relay, 31
a, 32a, 33a, 35a, 36a, 37a...
...Normally open contact, COSA1, COSB1...1st, 2nd
Automatic manual changeover switch, COSA2,
COSB2...Switch for switching between the first and second braking states.

Claims (1)

[Scope of utility model registration request] In a tube-making device that manufactures a tube by forming a strip of material wound around an uncoiler into a tube using a group of rolls, heating the edges of the material with a heating device, and welding it by pressing, the strip of material is rotatably supported and alternately rotated. The first supply side and non-supply side of
and a second reel, and first and second powder brakes that can be switched between a forced operation state in which the first and second reels are respectively braked and rotation of the reel is stopped, and a weak braking state in which the braking force can be adjusted. ,
The first and second powder brakes put the first and second powder brakes into a weak braking state, respectively, when switching to the automatic side.
When the automatic manual changeover switch and the first and second automatic manual changeover switches are switched to the manual side, the first and second powder brakes are set to the non-braking state, the weak braking state, and the forced braking state. An uncoiler for a pipe-making apparatus, characterized in that it is equipped with a first and second braking state switching switch that can be switched respectively.