JPH0415428Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The squeeze roll stand for the welded pipe manufacturing line according to this invention gradually curves a metal plate into a tubular shape using a roll forming machine, and the both edges of the metal plate are A squeeze roll is used to manufacture welded pipes by welding the butt joints, and when welding the seams, presses a metal plate processed to have a circular cross section from both sides with a predetermined pressure. of,
Used for rotatable support.

(Prior art) A welding method that is used as a metal tube used for various types of piping, etc. by bending a band-shaped metal plate into a circular cross-section using a roll forming machine, and then butting both side edges of this metal plate and welding the seam. tubes are widely used. Such a welded pipe is manufactured, for example, by a manufacturing apparatus as shown in FIG.

The manufacturing equipment shown in Figure 4 bends a strip-shaped metal plate into a circular cross section while feeding it from right to left, and then welds the joint to form a welded pipe. From the right end of
An uncoiler 3, an accumulator 4, a plurality of sets of forming rolls 5,
5, a welding device 7 with a squeeze roll attached, a cooling table 8, a shaping device 10 with a plurality of shaping rolls 9, and a cutting machine 1.
1. Runner out tables 12 are arranged.

When manufacturing a welded pipe, when a strip-shaped metal plate is sent out from the coil 1 attached to the uncoiler 3, the metal plate gradually becomes circular in cross section as it is fed through the forming device 6 from right to left in FIG. After the joints are welded using a welding device 7, the welded portion is cooled on a cooling table 8. Thereafter, while the welded pipe passes through the shaping rolls 9 of the shaping device 10, distortions in the cross-sectional shape are corrected. The welded pipe whose cross-sectional shape has been corrected is cut into a predetermined length by a cutting machine 11 and then sent to a runner out table 12.

A welding device 7 for welding the joints of metal plates processed to have a circular cross section by the forming device 6 is configured, for example, as shown in FIG. 6. That is, this welding device 7 connects the impeder 14 inserted into the inside of the metal plate 13 through the opening of the metal plate 13 which has been processed to have an arcuate cross section by forming rolls but is not yet closed. , a high frequency induction coil 15 surrounding the outer periphery of the metal plate 13, and this metal plate 13.
It is made up of a pair of squeeze rolls 16, 16 that press the opening edges from both sides and abut the opening edges against each other.

When welding seams, high frequency induction coil 15
When the metal plate 13 is fed in the direction shown by the arrow a in FIG. 6 while energizing, a high frequency induced current is induced in the metal plate 13, and the edge effect particularly
The opening edges 17, 17 become hot. The heated opening edges 17, 17 are abutted and welded together when the metal plate 13 passes between a pair of squeeze rolls 16, 16, and become a welded pipe 18.

In addition to the above-mentioned high-frequency induction heating method, various welding methods are known, such as high-frequency resistance heating method and arc welding method, which are selected depending on the material, wall thickness, intended use, etc. of the welded pipe to be obtained. In either case, the seam is pressed by a pair of squeeze rolls 16, 16. For this reason, no matter which welding method is adopted, in order to obtain a welded pipe of good quality, it is necessary to
It is necessary to make the force with which the metal plate 13 is pressed from both sides by the metal plate 6 to be appropriate.

For this reason, conventionally, by supporting the pair of squeeze rolls 16, 16 on a stand as schematically shown in FIG.
The pressing force can be adjusted freely. This conventional squeeze roll stand includes one threaded rod 19 having male threads 20a, 20b formed in opposite directions at both ends, and each male thread 20a, 20 of this threaded rod 19.
It consists of sliding blocks 22a, 22b having screw holes 21a, 21b screwed into the shafts 23, 2, which are installed on the upper surface of each sliding block 22a, 22b.
3 rotatably supports squeeze rolls 16, 16, respectively.

When pressing the seam of the metal plate 13, which has a circular cross section, the screw rod 19 should be moved in the direction indicated by the arrow b in FIG.
direction, both sliding blocks 22a, 22
b are moved toward each other on the upper surface of the pedestal 24, and the metal plate 13 is sandwiched between the squeeze rolls 16, 16. Both squeeze rolls 16,1
metal plate 13 that passes between 6 and is welded at the seam.
When adjusting the pressing force against the screw rod 19, the torque for rotating the screw rod 19 is adjusted.

(Problem to be solved by the invention) However, in the conventional squeeze roll stand constructed and operated as described above, the metal plate 1
When adjusting the force for pressing 3, the operator's intuition was relied on, so the adjustment required skill, and it was difficult to always perform stable welding work.

Japanese Patent Publication No. 57-39878 discloses that by combining a pressure spring and a decompression spring, the force pressing against the metal plate is strong at the beginning of the production of welded pipes, and becomes weaker at the end of production. However, it is not possible to detect the force itself that presses the metal plate, and if the thickness or material of the metal plate is changed, it is necessary to adjust the appropriate pressing force in response to this change. is difficult to obtain.

In addition, Japanese Utility Model Application Publication No. 59-185088 and its specification describe a technique for preventing the shaft on which the squeeze roll is pivoted at the upper end from tilting based on the signal from the load cell. There is no description of the structure, and in terms of the overall structure,
It is difficult to accurately detect the load applied to the squeeze roll.

The object of the present invention is to provide a squeeze roll stand for a welded pipe manufacturing line that is free from such inconveniences.

(Means for solving the problem) The squeeze roll stand for the welded pipe manufacturing line according to the present invention has internal threads in opposite directions on the inside of the groove-shaped receiver fixed to the bed surface of the welded pipe manufacturing machine. A pair of sliding blocks each having a threaded hole formed in the surface extending along the length of the receiver are fitted together so that the receiver can slide only in the length direction. Each of the pair of sliding blocks has a threaded hole in the inner circumferential surface with female threads in opposite directions extending along the length of the receiver, and one threaded rod can be inserted into this threaded hole. Male threads formed in opposite directions are screwed together at both ends of the connector.

A support block is mounted on the upper surface of each sliding block near the center of the receiver so that it can move freely only in the longitudinal direction of the receiver and relative to the sliding block.

A shaft is installed on the upper surface of each of these support blocks, and a squeeze roll is rotatably supported on each shaft.

Further, a first rising portion rising upward is provided at the outer end of each of the sliding blocks, and a first rising portion rising upward is provided on the inner surface of the first rising portion and the outer end of the support block. A load measurement that detects the pressing force acting between the outer surface and the inner surface of the second rising portion formed by rising, at a position approximately at the same height as the welded pipe formed by the squeeze roll. element is provided.

(Function) In the squeeze roll stand for the welded pipe manufacturing line of the present invention constructed as described above, by rotating the threaded rod, the pair of sliding blocks fitted in the receiver can be moved in the distance. do.

As the sliding blocks move, the squeeze rolls supported on the shafts on the top surfaces of the support blocks placed on the top surface of each sliding block move. When the metal plate is pressed from both sides, the support block is pushed outward as a reaction.

The magnitude of the force that pushes the support block outward in this way is determined by the force between the outer surface of the second rising portion formed at the outer end of the support block and the inner surface of the first rising portion formed on the sliding block. The load is detected by the installed load measuring element, but since this load sensing element is installed at approximately the same height as the welded pipe formed by the squeeze roll, the pressing force acting between the outer surface and the inner surface is detected. It is possible to directly detect and obtain accurate measurement values.

Therefore, from the output of this load measuring element, it is possible to accurately know the magnitude of the force with which the pair of squeeze rolls press the metal plate from both sides, and it is possible to finely adjust this force.

(Example) Next, the present invention will be explained in more detail by explaining the illustrated embodiment.

Figures 1 to 3 show an embodiment of the squeeze roll stand of the present invention, in which Figure 1 is a longitudinal sectional view taken in a direction perpendicular to the feeding direction of the metal plate, Figure 2 is a plan view, and Figure 3 is a plan view. 2 is a sectional view taken along line A-A in FIG. 2.

A groove-shaped receiver 26 that is open at the top is fixed to the upper surface of the substrate 25 (corresponding to the bed surface of a welded pipe manufacturing machine) that is fixed to the floor of the factory. A pair of left and right sliding blocks 28a and 28b, each having a sliding plate 27 made of a metal material with a low coefficient of friction such as gunmetal or oil-impregnated metal attached to the bottom surface, is fitted inside. Each sliding block 28a, 28b has a circular hole 29 extending in the length direction of the receiver 26 (left and right direction in FIGS. 1 and 2), and a cylinder 30a, 30b is inserted into this circular hole 29, respectively. Push in, screw 31,
It is fixed by 31. Each cylinder 30a, 30b
Female threads 32a and 32b are respectively formed on the inner circumferential surface of the holder, but both female threads 32a and 32b are oriented in opposite directions. Furthermore, each sliding block 28
Outer ends of a and 28b (both left and right ends in Figures 1 and 2)
A first rising portion 33 is provided in each of the first rising portions 33, and a load cell 34 is fixed to the inner surface of each first rising portion 33.

Support blocks 35a and 35b are placed on the upper surfaces of both sliding blocks 28a and 28b as described above via roller bearings 36 and 36, respectively. A circular hole 37 is formed in each of the support blocks 35a, 35b in the length direction of the receiver 26, and a threaded rod 19 passes through the inside of each circular hole 37,37.

Due to the presence of roller bearings 36, 36, these support blocks 35a, 35b are able to move slightly parallel to each sliding block 28a, 28b in the left-right direction in FIGS. 1st
- In the case of the support block on the left side in Figure 2, the right side, and for the right side support block, the left side. ) is restricted by stoppers 38, 38 fixed to the upper surface of the inner end of each sliding block 28a, 28b.

Further, a second rising portion 39 is formed at the outer end of each support block 35a, 35b, and a protruding piece 40 fixed to the outer surface of the upper end of each second rising portion 39 is arranged so as to face the load cell 34. I'm letting you do it.

Each of the sliding blocks 28a, 28b and support blocks 35a, 35b described above are arranged inside the receiver 26 in the longitudinal direction of the receiver 26 (the first to
Although it is slidable or movable in the horizontal direction (left and right direction in Fig. 2), restraining rails 41, 41 protruding inward are fixed to both side edges of the upper end opening of the holder 26, and these restraining rails 41, 41 The bottom surface holds down the top surface of each block's shoulder. The holding rails 41, 41 are also made of a material with a low coefficient of friction, similar to the above-mentioned sliding plate 27, and each sliding block 28a, 28
b can be slid against the restraining rails 41, 41 with a light force. Therefore, four blocks 28
a, 28b, 35a, 35b are all receivers 26
Although it can be smoothly translated in the length direction, the sliding plate 27 on the lower surface of each sliding block 28a, 28b may be lifted off the bottom surface of the receiver 26, or the lower surface of each supporting block 35a, 35b may be a roller bearing. 3
It doesn't rise above 6.36.

Each support block 35a, 3 is placed on the upper surface of the sliding block 28a, 28b so as to be able to move slightly in parallel.
A shaft 23 is installed on the upper surface of each of the shafts 5b, and a squeeze roll 16 is rotatably supported on each shaft 23 via a bearing 42.

In the illustrated example, the arc-shaped groove formed on the outer circumferential surface of the squeeze roll 16 supported on each shaft 23 is shaped so that the upper side is slightly chipped than a semicircle, so that the metal plate that is not pressed by both squeeze rolls 16, 16 is formed. The joint portion is pressed by a pressing roll 44 that rotates around a horizontal shaft 43 whose vertical position is freely adjustable.

That is, a threaded rod 4 is attached to the center of the upper end of a gate-shaped support 45 that is fixed to the upper surface of the board 25 together with the receiver 26.
6 is hung rotatably, and this threaded rod 46 is screwed into a threaded hole 48 of a lifting block 47.
The horizontal shaft 43 is stretched between a pair of support arms 49, 49 extending from the lifting block 47, and the holding roll 44 is mounted on the outer periphery of the horizontal shaft 43 via bearings 50, 50. It is rotatably supported.

The operation of the squeeze roll stand for the welded pipe manufacturing line of the present invention, which is configured as described above, is as follows.

When welding the seam of metal plates processed to have a circular cross section, rotate the threaded rod 19 and fit it into the holder 26, as in the case of the conventional squeeze roll stand shown in FIG. The left and right sliding blocks 28a and 28b are moved closer to each other. As the sliding blocks 28a, 28b move, the supporting blocks 35a, 35b placed on the upper surface of each sliding block 28a, 28b also approach each other, and the shafts 23, 23 on the upper surface of both supporting blocks 35a, 35b move closer to each other. Squeeze rolls 16, 16 rotatably supported on
presses the metal plate from both sides.

In addition, by rotating the screw rod 46 suspended from the support 45, the lifting block 47 is lowered, and the outer peripheral surface of the holding roll 44, which is rotatably supported on the horizontal shaft 43, is brought into contact with the seam of the metal plates. The metal plates fed between the squeeze rolls 16, 16 are brought into contact with each other so that the joints of the metal plates are aligned and good welding can be performed.

In this state, an outward force is applied to each of the squeeze rolls 16, 16 pressing both sides of the metal plate as a reaction to the pressing force. This force is applied to the shafts 23, 23 and each support block 35.
Second rising portions 39, 39 of a, 35b, protruding piece 4
0 and 40 to load cells 34 and 34, which detect the magnitude of the outward force.

Each of the load cells 34, 34 is provided at approximately the same height as the welded pipe formed by the pair of squeeze rolls 16, 16, so each load cell 34, 34 allows each squeeze roll 16, 16 to It is possible to accurately determine the amount of force that presses against the side of the metal plate.

Therefore, from the output of each of the load cells 34, 34, the magnitude of the force with which the pair of squeeze rolls 16, 16 press the metal plate from both sides is accurately known, and this force is delicately adjusted to press the metal plate. Even if the thickness or material changes, it is possible to manufacture high-quality welded pipes by adjusting the pressing force to an appropriate level.

(Effects of the invention) The squeeze roll stand for the welded pipe production line of the present invention is constructed and operates as described above, so it has the following advantages compared to the conventional squeeze roll stand. It has a good effect.

(1) Since the magnitude of the force pressing the metal plate can be known numerically, the optimum pressing force can always be obtained without any special skill required, and welded pipes with stable quality can be manufactured.

(2) Since the pressing force is directly detected, the error between the actual pressing force and the detected value can be kept to an extremely low level.

(3) If the screw rod 19 can be rotated forward and backward by a motor, and the rotation and stop of this motor can be controlled based on signals from a load cell (load sensing element), the force pressing against the metal plate can be kept constant at all times. This enables feedback control.

(4) Despite being able to detect pressing force, the overall structure is simple and the installation area does not increase.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the squeeze roll stand of the present invention, in which Figure 1 is a longitudinal sectional view taken in a direction perpendicular to the feeding direction of the metal plate, Figure 2 is a plan view, and Figure 3 is a plan view. is a sectional view taken along the line A-A in Figure 2, Figure 4 is a side view of the welded pipe production line, Figure 5 is a diagram similar to Figure 1 schematically showing a conventional stand for squeeze rolls, and Figure 6 is a diagram showing the squeeze roll. 1 is a perspective view showing an example of a welding device equipped with a welding device. 1... Coil, 2... Jib crane, 3... Uncoiler, 4... Accumulator, 5... Forming roll, 6... Forming device, 7...
Welding device, 8... Cooling stand, 9... Shaping roll,
10... Shaping device, 11... Cutting machine, 12... Runner out table, 13... Metal plate, 14...
Impeder, 15...High frequency induction coil, 16...
...Squeeze roll, 17...Opening edge, 18...
Welded pipe, 19...Threaded rod, 20a, 20b...Male thread, 21a, 21b...Threaded hole, 22a, 22
b... Sliding block, 23... Shaft, 24... Holder, 25... Board, 26... Holder, 27... Sliding plate, 28a, 28b... Sliding block, 29...
Circular hole, 30a, 30b... cylinder, 31... screw,
32a, 32b... Female thread, 33... First rising portion, 34... Load cell, 35a, 35b...
Support block, 36...Roller bearing, 37
... circular hole, 38 ... stopper, 39 ... second rising part, 40 ... protrusion, 41 ... restraining rail, 4
2...bearing, 43...horizontal shaft, 44...pressing roll, 45...post, 46...screw rod, 47...
...lifting block, 48...screw hole, 49...support arm, 50...bearing.

Claims (1)

[Scope of utility model registration request] On the inside of a groove-shaped receiver fixed to the bed surface of a welded pipe manufacturing machine, a pair of sliding screw holes are formed in the inner circumferential surface with internal threads in opposite directions, extending along the length of the receiver. The moving blocks are fitted so that they can slide only in the longitudinal direction of the receiver, and the screw holes formed at both ends of one threaded rod in opposite directions are inserted into each threaded hole of the pair of sliding blocks. The male threads are screwed together, and a support block is placed on the upper surface of each sliding block near the center of the holder, so that the holder can only be moved in the length direction relative to the holder and the sliding block. A squeeze roll is rotatably supported on a shaft installed on the upper surface of each support block, and a first rising portion rising upward is provided at the outer end of each sliding block. and the outer surface of the second rising part formed upwardly at the outer end of the support block, at approximately the same height as the welded pipe formed by the squeeze roll. A squeeze roll stand for a welded pipe production line, comprising a load measuring element located at a position to detect a pressing force acting between the outer surface and the inner surface.