JP2542787Y2 - Spiral steel pipe manufacturing equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention uses an inside beam installed in a spiral steel tube forming station.
The present invention relates to a device for moving an inside beam to a replacement position by removing a connection between an inside beam, a stand, and a rocking device when replacing the inside beam according to a diameter and a plate thickness of a formed spiral steel pipe.

[0002]

2. Description of the Related Art FIGS. 5, 6 and 7 show a plan view, a side view and a front view of a conventional forming station.

In these figures, a spiral steel tube forming station 1 has a stand 2 fixed to the floor, an elevating device 3 attached to the stand 2, and a two-axis attached to the tip of a screw shaft of the elevating device 3. Fork 1
1, the inside beam 4 connected via a bearing pin 12, a device 5 for swinging the inside beam 4 about the bearing pin 12, and a movable part 4a of the inside beam 4 so as to be movable. , A bending roll 7 rotatably supported by the chock 6, two rolls 8 supporting the steel strip S,
And a plurality of forming guide rolls 9.

A pair of forming rolls 10 each including one bend rig roll 7 and two steel strip supporting rolls 8 are provided.
A plurality of forming guide rolls 9 that move in accordance with the diameter of the spiral steel pipe to be formed are provided in a plurality of rows in a traveling direction (arrow A) because the steel strip S is formed. 40 is a pre-bender, 41 is a main drive, 50 is a large diameter steel pipe, and 60 is a small diameter steel pipe.

Generally, in the forming station 1,
After the spiral steel pipe is unwound from a steel strip wound in a roll shape (not shown), the steel is formed so that the entrance angle θ is set at the inlet swivel base in accordance with the diameter of the spiral steel pipe to be formed, and goes straight in the direction of arrow A. Start winding the belt S from the tip
At the end of the winding, the entry side flat plate and the edge are temporarily welded to each other, and from this welding starting point, while the forming and the temporary welding are gradually performed, the reduction amount of the bend dig roll 7 and the forming guide roll 9 are gradually reduced. After the arrangement is finely adjusted and the butting of the edges of the steel strip S is stabilized, the continuous operation is started to perform the main welding. In addition, 70 is an outer surface welding machine, 80 is an inner surface welding machine, and 90 is a pipe support.

[0006] In forming the steel strip S, the steel strip S supported by the two steel strip support rolls 8 is pressed down from one side by one bendig roll 7 to bend to a target curvature. The steel strip S is sequentially spirally formed while being guided by the forming guide rolls 9 arranged on the outer periphery of the steel strip S bent. W is the width of the steel strip S.

FIG. 8 is a sectional view showing a lifting device and a swinging device. In the drawing, a lifting device 3 includes a nut 14 fixed to a stand 2 fixed to a floor surface, and a screw shaft screwed to the nut 14. 13, a fork 11 attached to the tip of the screw shaft 13, the support pin 12, a driving device 15 for rotating the screw shaft 13, and a nut provided between the fork 11 and the stand 2 (not shown). 14 and screw shaft 13
And a hydraulic cylinder that takes backlash 2 of the screw.

FIG. 9 is a side view of the swinging device, and FIG.
9 and FIG. 9, the swinging device 5 includes the inside beam 4.
A guide plate 16 fitted in the rectangular groove 4b so as to be slidable in the vertical direction, an eccentric shaft 17 having an eccentric shaft portion 17a pressed into the guide plate 16, and a lever fixed to the eccentric shaft 17 Drive device 1 for swinging lever 18 about eccentric shaft 17
9.

When a spiral steel pipe is formed in the forming station 1 having the above-described structure, a large forming load is applied to the forming portion 4a of the inside beam 4, the tip 4p of the forming portion 4a is bent upward, and the roll forming is performed normally. No longer.

In order to correct the deflection δ, the eccentric shaft 17 is rotated and the guide plate 16 is moved rightward (arrow B).
, The inside beam 4 is swung counterclockwise around the support pin 12 and the tip 4p of the molded portion bent upward is bent.
To the normal position.

The outer diameter of the formed spiral steel pipe is 400
mm to 2000 mm and a plate thickness of 4.5 mm to 25 mm. Here, for example, as shown in FIG.
When the steel strip S is bent, the rolling load applied to the bend rig roll 7 for this bending is considerably large. The diameter must be around 190 mm.

Therefore, structurally, the diameter of the molded portion 4a of the inside beam 4 is about 520 mm, and the diameter is 600 mm.
The following spiral steel pipes cannot be formed.

Therefore, in order to form a spiral steel pipe having a diameter of 400 mm to 600 mm, a small inside beam having a small diameter of the formed portion 4a must be replaced.

Generally, two or three stages of inside beams are prepared according to the diameter and thickness of the spiral steel pipe. For example, 400φ to 600φ, small size for plate thickness 4.5 to 14, 6
Medium size for 00φ to 800φ, thickness of 4.5 to 19, 800
Three types of large inside beams for φ-2000φ and thickness of 6.0-25 are prepared.

[0015]

As described above, in order to replace the inside beam of each type according to the diameter and the plate thickness or the cross-sectional dimension of the conventional spiral steel pipe, the following operation steps are required. .

(1) The lower end of the inside beam is supported by a jack or the like fixed to the floor surface and lifted up slightly to create a small clearance between the support pin and the support pin hole of the inside beam, thereby forming the support pin. Punch out.

(2) Next, the fork is raised by the lifting device and the inside beam is lowered by manipulating the jack to dodge the fork. Then, the wire rope is hooked on the hanging member of the inside beam while the jack is being squeezed. Lift up slightly with a crane or the like and shift it toward you, and remove the rectangular groove of the inside beam from the guide plate of the rocking device.

(3) Next, the wire rope is lifted upward by a crane or a chain block and carried outside. This completes the removal of the inside beam.

When a substitute inside beam is mounted, the above operation sequence is reversed.

The weight of the inside beam is about 1
Since the inside beam is replaced by the conventional procedure described above, it is necessary to operate a jack, a crane or a chain block to move the inside beam to the replacement position. About 1 day)
There was a problem that required.

The present invention solves the above-mentioned disadvantages and provides a new spiral steel pipe manufacturing apparatus capable of moving an inside beam to an exchange position and vice versa in a short time by one worker by operating a push button. It is intended to be.

[0022]

According to a first aspect of the present invention, there is provided a spiral steel pipe manufacturing facility comprising: a lifting device attached to a stand fixed to a floor at a spiral steel pipe forming station; An inside beam fitted between a bifurcated fork attached to the tip of a screw shaft of the lifting device, a device for removing and inserting a support pin connecting the inside beam to the stand, and removing the support pin and A device for suspending the inside beam on a stand, a device for moving the inside beam while suspended to a replacement position, and a device for abutting only one side of the inside beam and swinging the inside beam about the bearing pin It is characterized by having.

[0023]

In the spiral steel pipe manufacturing equipment according to the present invention, the connection between the stand and the inside beam is released by pulling out the support pins by the support pin pulling-out device installed in the spiral steel pipe forming station.

However, at the same time as it comes off, a long groove provided in the moving direction of the suspension device, for example, the fork on the stand side, is fitted into this long groove so as to roll in the moving direction, and the roller is rotatably mounted on the inside beam. The inside beam is suspended by the stand and does not fall by the suspension device consisting of

The inside beam suspended on the stand is moved to the replacement position by the suspension device and the moving device provided on the stand while being suspended.

On the other hand, when the inside beam moves to the exchange position, the side of the inside beam with which the swinging device is in contact naturally moves away from the swinging device. Need not be removed from the rocking device.

As a result, when replacing the inside beam according to the diameter and thickness of the formed spiral steel pipe, the inside beam of the heavy object can be shortened in a short time without a great deal of labor by remote control by one operator using a push button. Can be easily exchanged.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a forming station in a spiral steel pipe manufacturing facility according to an embodiment of the present invention,
2 is a side view of FIG. 1, FIG. 3 is a front view of FIG.
FIG. 4 is an enlarged sectional view of a portion A (molded portion) in FIG.

In these figures, 1 is a forming station, 2 is a stand, 3 is a lifting device, 4 is an inside beam, 4a is an inside beam forming part, 6 is a chock, 7 is a bendig roll, and 8 is a steel strip support roll. ,
Numeral 9 denotes a forming guide roll and numeral 12 denotes a bearing pin. These members are denoted by the same reference numerals as those of the conventional apparatus shown in FIGS.

As shown in FIG. 3, a stand-off unit 2 is provided with a pull-out / insertion device 21 comprising a guide cylinder 22 for guiding the bearing pin 12 and a hydraulic cylinder 23, and is attached to the tip of the screw shaft 13 of the lifting / lowering device 3. The support pin 12 for connecting the inside beam 4 and the stand 2 fitted between the forked forks 25 is inserted and removed.

As shown in FIG. 2, the side surface of the bifurcated fork 25 is formed in a shape elongated in the horizontal sliding direction (arrow) of the inside beam 4, and an elongated guide groove 25b is formed in this moving direction in FIGS. As shown in FIG.
Is machined on the inner surface 25a.

The suspension device 24 is provided with the forked fork 25.
And a plurality of rollers 26 rotatably attached to the inside beam 4. The rollers 26 are fitted into the guide grooves 25 b, and when the bearing pins 12 are removed, the inside beams 4 are suspended in the guide grooves 25 b. 4 to FIG.
When the moving device 27 is moved to the exchange position shown by the alternate long and short dash line in the guide groove 25b and on the guide rail 25c fixed to the stand 2 adjacent to the fork 25, the moving device 27 moves.

The moving device 27 includes a hydraulic cylinder 28 attached to the stand 2 so as to be able to move in the horizontal direction, that is, the moving direction (the direction of the arrow in FIG. 2B), a hole 4c provided at the rear end of the inside beam 4, and an inside 4c. When the beam 4 is moved to the replacement position, a pin 29 is provided to be inserted into the hole 28a and the hole 4c of the output shaft of the hydraulic cylinder 28.

In FIG. 1, there is provided a device 38 for holding the inside beam 4 so as not to move in the left-right direction (the direction of arrow C). The holding device 38 comprises a hydraulic cylinder 30 provided to be able to swing on the stand 2, a lever 31 swinging about a pin 37 as a fulcrum, and a holding block 36. The position of the block 36 sandwiches the end of the inside beam 4 (solid line).
Drive with

When the inside beam 4 is replaced, the holding block 36 is turned to the release position (dotted line) by the cylinder 30.

As shown in FIG. 2, the oscillating device 32 includes a gantry 33 fixed on the floor, a driving device 34 attached to the gantry 33, and a wedge 35 which moves up and down by the driving device 34. Abuts against the tapered portion 4d on one side surface of the inside beam 4, and the inside beam 4 swings around the support pin 12 by the vertical movement of the wedge 35 to correct the deflection above the tip 4a of the inside beam forming portion. I do.

When the inside beam 4 moves to the exchange position, the tapered portion 4d separates from the tapered surface 35a of the wedge 35.

The swinging can also be performed by a mechanism using an eccentric shaft, a cam or the like.

Next, the procedure for exchanging the inside beam 4 of the forming station 1 in which the devices 21, 24, 27, 32 and 38 according to the present embodiment are installed will be described as follows.

(1) The clamping block 36 is moved to the detached position by the hydraulic cylinder 30 of the clamping device 38.

(2) Insert the pins 29 into the holes 28a and 4c.

(3) Hydraulic cylinder 2 of insertion / removal device 21
At 3, the support pin 12 is pulled out and the connection between the stand 2 and the inside beam 4 is released.

(4) The inside beam 4 is suspended by the rollers 26 of the suspension device 24 and the guide grooves 25b at the same time when the connection of the above item (3) is disconnected.

(5) The inside beam 4 is moved to the replacement position by the hydraulic cylinder 28 of the moving device 27. By this movement, the tapered portion 4d of the inside beam 4 naturally separates from the tapered surface 35a of the wedge 35 of the swing device 32.

To return the replaced inside beam 4 to the normal position (spiral steel pipe forming position), the above procedure may be reversed.

The above item (2) is determined by the operator according to (1)
The items and the items (3) to (5) are automatically performed by a push button operation.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various designs can be changed within the technical idea of the present invention. Also belong to the technical scope of the present invention.

[0048]

[Effect of the invention] The manufacturing equipment for the spiral steel pipe of the invention is
Since the bearing pin insertion / removal device, suspension device, moving device, and swing device are installed at the spiral steel tube forming station, when replacing the inside beam according to the diameter and plate thickness of the formed spiral steel tube, the worker 1
In a short time (about 1 hour),
The inside beam of a heavy object can be replaced without requiring much labor unlike the related art.

[Brief description of the drawings]

FIG. 1 is a plan view of a spiral steel pipe forming station according to an embodiment of the present invention.

FIG. 2 is a side view of the forming station.

FIG. 3 is a front view taken along line BB of FIG. 2;

FIG. 4 is an enlarged sectional view of a portion A which is a molded portion in FIG.

FIG. 5 is a plan view of a conventional spiral steel pipe forming station.

FIG. 6 is a side view of the forming station.

FIG. 7 is a front view taken along line AA of FIG. 6;

FIG. 8 is a sectional view of a lifting device and a swinging device.

FIG. 9 is a side view of a conventional swing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forming station 2 Stand 3 Elevating device 4 Inside beam 4a Inside beam forming part 6 Chock 7 Bending roll 8 Steel strip support roll 9 Forming guide roll 10 Forming roll 12 Bearing pin 21 Insertion and removal device 24 Suspension device 25 Fork 26 Roller 27 Moving device 23, 28, 30 Hydraulic cylinder 32 Swinging device 38 Nipping device 50 Large diameter spiral steel pipe 60 Small diameter spiral steel pipe 70 Outer surface welding machine 80 Inner surface welding machine 90 Pipe support S Steel strip W Steel strip width dimension θ Entry angle

Claims (1)

(57) [Scope of request for utility model registration] In a spiral steel pipe forming station, an elevating device attached to a stand fixed to a floor surface and an inside beam fitted between a forked fork attached to a tip of a screw shaft of the elevating device are provided. A device for removing and inserting a support pin connecting the inside beam to the stand, a device for removing the support pin and suspending the inside beam on the stand at the same time, and a device for moving the inside beam suspended to a replacement position. A device for abutting only on one side of the inside beam and swinging the inside beam about the bearing pin.