JP3044247B2 - Inner roll type ERW pipe forming machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner-roll type electric resistance welded tube forming machine, and more particularly, to a method for shortening the time required for changing rolls offline and for assembling work online, and for controlling the upper roll axle box and the left and right sides. The present invention relates to an inner roll type electric resistance welded tube forming machine which can eliminate the need for a buffer liner with a roll axle box and can improve the operation safety.

[0002]

2. Description of the Related Art For example, in electric resistance welded pipes such as pipes for water pipes and gas pipes and ventilation ducts, a strip-shaped thin sheet derived from an uncoiler is continuously formed into a circular cross section or a quadrangular cross section, and then the thin sheet is formed. It is manufactured by welding a butt portion in the width direction and cutting it to a predetermined length. In this ERW pipe production line, a predetermined number of ERW pipe forming machines equipped with a set roll structure having a plurality of forming rolls for bending a thin plate are provided upstream and downstream of a welding device. Have been. By the way, since the size and shape of ERW pipes manufactured by one ERW pipe production line vary widely, the forming roll incorporated in the ERW pipe forming machine must be replaced every time the type is changed accordingly. No. Since the roll exchange is a large-scale operation using an overhead crane or the like and requires a relatively long operation time, if the operation is performed in an electric resistance welded tube forming machine (in-line), productivity is greatly reduced.

In order to solve this problem, Japanese Patent Publication No. 58-5584 filed by the present applicant filed as the prior art.
No. 6, “Inner stand type rolling mill”, a movable trolley on which a roll assembly is mounted is pulled out of a forming stand installed on an ERW pipe production line (offline). Instead, the inner roll type electric resistance welded tube forming in which a set roll structure in which a new forming roll is assembled is transferred into a forming stand by using another moving carriage and set and the roll of the forming roll is exchanged. Machine is being developed. The set roll structure includes upper and lower rolls,
It consists of left and right side rolls and an inner stand to which these rolls are assembled.When replacing an old forming roll that has been pulled out, lift the upper roll from inside the inner stand using an overhead crane, etc. Withdraw, then remove the inner stand on the trolley, finally pull up and remove the lower roll, then assemble a new forming roll on the trolley in the reverse order of this operation. A liner serving as a cushioning material is interposed between the upper roll axle box and the left and right side roll axle boxes.

[0004]

However, in the prior art inner roll type electric resistance welded tube forming machine, when the forming roll is replaced, a liner corresponding to the thickness of the left and right side roll shaft boxes is climbed on the inner stand. Since the worker had to change the work by hand, the work was troublesome and the work was dangerous. In particular, inline
When removing the drive-side liner, there is no space due to the drive spindle, which is a dangerous and cumbersome operation. Also, when removing the left and right side rolls from the inner stand, cotters that hold the sliding projections formed at both ends of the left and right side roll axle boxes so that they can slide horizontally from above are manually inserted and removed. Therefore, there is a problem that the operation is troublesome and troublesome, and furthermore, depending on how the cotter is inserted, the left and right side roll shaft boxes rattle and cannot slide smoothly.

Further, in the conventional apparatus, there is a screw jack attached to the side of the forming stand when assembling and removing the left and right side rolls, but the drive side lower roll axle box is relatively connected to the drive spindle. The long roll shaft is protruding, and to avoid the length,
Since the stroke of the rod of the driving-side pressure side device was larger than the stroke of the rod on the working side, the working time was correspondingly longer. Furthermore, since the lateral widths of the left and right side roll axle boxes and the lower roll axle box are almost the same length, when replacing the lower roll as described above, there is always 4 to 5 tons of weight before and after. The inner stand must be attached to and detached from the movable trolley, and the addition of this large-scale operation causes a problem that the roll changing operation becomes even more dangerous and time-consuming.

The present invention has been made in view of the above circumstances, and can reduce the time required for the roll replacement work offline and the time required for the assembly work online, and does not require a buffer liner between the upper roll axle box and the left and right side roll axle boxes. It is an object of the present invention to provide an inner roll type electric resistance welded tube forming machine capable of improving the work safety.

[0007]

According to the present invention, there is provided a semiconductor device comprising:
The inner roll-type ERW pipe forming machine described above is mounted on a forming stand provided on a line of ERW pipe manufacturing equipment, and a movable carriage taken in and out of the forming stand, and bends the ERW pipe from a thin plate. An inner-roll-type electric resistance welded tube forming machine including a set roll structure to be formed, wherein the set roll structure includes a plurality of forming rolls including at least upper and lower rolls removably mounted on the movable carriage. Each of these forming rolls has an inner stand which is assembled via an axle box, and the inner stand is provided with an upper roll supporting means for inserting and removing a support member of the upper roll axle box.

According to a second aspect of the present invention, there is provided an inner roll type electric resistance welded tube forming machine according to the first aspect, wherein the upper roll supporting means is attached to the forming stand side. , And a support operation unit for moving the support member in and out by operating an input element.

Further, the inner roll type electric resistance welded tube forming machine according to the third aspect of the present invention is the inner roll type electric resistance welded tube forming machine according to the first or second aspect, wherein the forming rolls of the assembled roll structure are the upper and lower rolls. In addition, the inner stand has a slidable cotter that is disposed above the sliding protrusion of the left and right side roll shaft box and presses the sliding protrusion. In addition, the cotter and the sliding protrusion are formed with a comb-tooth portion capable of passing the left and right side roll shaft boxes to a sliding position below the cotter by aligning the concave and convex portions of each other. It is configured to:

Further, the inner roll type electric resistance welded tube forming machine according to the fourth aspect of the present invention is the inner roll type electric resistance welded tube forming machine according to the third aspect, wherein an outer surface of the side roll shaft box is provided on the outer surface of the side roll axle box. The pressure member of the pressure side device attached to the side portion is configured to protrude the side shaft box pressing portion with which the pressing member abuts.

According to a fifth aspect of the present invention, in the inner roll type electric resistance welded tube forming machine according to the third or fourth aspect, the storage width of the lower roll shaft box in the inner stand is as follows. The left and right side roll axle boxes are configured to be smaller than the minimum storage width.

[0012]

In the inner roll type electric resistance welded tube forming machine according to the first to fifth aspects, when the roll is replaced, the supporting member is projected by the upper roll supporting means, and the upper roll axle box is supported in the inner stand. The lower surface of the upper roll axle box and the upper surface of the left and right side roll axle boxes or the upper surface of the lower roll axle box are in contact with each other as described above. There is no danger of collision due to up and down movement and damage, and there is no liner intervention that requires this time and effort,
The work time required for roll change is reduced. In particular,
In-line work eliminates the problem of attaching and detaching the drive side liner, which was a problem due to the presence of the drive spindle.
Worker safety is ensured, and time and labor are greatly improved.

[0013] In particular, in the inner roll type electric resistance welded tube forming machine according to the second aspect of the present invention, the support operation section mounted on the forming stand side is operated to support the upper roll supporting means mounted on the inner stand by the input element. The upper roll axle box is supported by protruding the members, and in this state, the roll assembly is assembled into the forming stand by the moving cart, and the roll assembly is removed from the forming stand. After arranging the set roll structure at a predetermined position, operating the support operation unit to pull in the support member of the upper roll support means by the input element to release the support state of the upper roll axle box,
Since the upper roll is in a state in which the electric resistance welded tube can be formed, when the roll is replaced, the movable carriage is often replaced with a separate one. One operation unit is sufficient, and equipment costs can be reduced.

Further, in the inner roll type electric resistance welded tube forming machine according to the third aspect, when the left and right side rolls are incorporated in the inner stand at the time of the roll replacement offline, the cotter on the inner stand side is slid. The unevenness of the comb teeth of the cotter and the unevenness of the comb teeth of the sliding protrusions of the left and right side roll shaft boxes are aligned so as not to interfere with each other. After passing through the sliding position under the cotter, return the cotter to its original position so as to close the cover. Conversely, when removing the left and right side rolls from the inner stand, use the same sliding projection. The left and right side roll axle boxes are taken out from the sliding position under the cotter with the irregularities of the comb teeth of the cotter and the cotter aligned, so that the sliding protrusion is slidably held from above as in the past. There is no need to manually insert and remove the cotter into the inner stand, improving safety and workability.Also, the sliding of the left and right side roll axle boxes is always smooth without rattling due to the degree of insertion of the cotter. Smooth sliding is obtained.

Further, in the inner roll type electric resistance welded tube forming machine according to the fourth aspect, when assembling or removing the set roll structure in the forming stand in-line, the side axle box is formed from the outer surface of the side roll axle box. Since the pressing portion is protruding, the pressure side device attached to the forming stand can be made to protrude from the forming position of the ERW tube of the side roll shaft box or the lower roll shaft box only by making the pressing member relatively small in and out. It can be moved to the axle box removal position avoiding the long roll shaft connected to the drive spindle.

Furthermore, in the inner roll type electric resistance welded tube forming machine according to the fifth aspect, the storage width of the lower roll axle box in the inner stand is smaller than the minimum storage width of the left and right side roll axle boxes. When removing the lower roll axle box, or assembling the left and right side roll axle boxes after assembling the lower roll axle box, the inner stand does not need to be attached to or detached from the moving cart. Work time can be shortened, and work safety can be improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. In the drawings, the production line direction of the ERW pipe is defined as an X direction, a direction orthogonal thereto is defined as a Y direction, and a vertical direction is defined as a Z direction. Here, FIG. 1 is an overall perspective view of an inner roll type electric resistance welded tube forming machine according to one embodiment of the present invention, FIG.
FIG. 3 is a side view including a partial cross-sectional view of the roll assembly;
Is an exploded perspective view of the set roll structure, FIG. 5 is a cross-sectional view showing an assembly structure of an upper roll axle box of the set roll structure, and FIG. 6 is a cross-sectional view showing an assembly structure of right and left side roll axle boxes of the set roll structure. 7, FIG. 7 is a cross-sectional view showing an assembling structure of the lower roll axle box of the assembled roll structure, FIG. 8 is an enlarged perspective view of a main part showing a state in which the upper roll is supported by the upper roll supporting means, and FIG.
FIG. 9A is an enlarged sectional view of a main part showing a state in which the upper roll is supported by the upper roll supporting means, FIG. 9B is an enlarged sectional view of a main part showing a state in which the upper roll is unsupported by the upper roll supporting means, and FIG. 10A is a schematic front view showing a state where the upper roll axle box is assembled, FIG. 10B is a schematic front view showing a state where the upper roll axle box is pulled up, and FIG. 10C is an electric resistance welded tube of the upper roll axle box. FIG. 11 (a) is an enlarged perspective view including a partial cross-sectional view showing a slidable state of the left and right side roll axle boxes, and FIG. 11 (b) is a drawing of the left and right side roll axle boxes. It is an expansion perspective view including a partial sectional view showing a possible state.

As shown in FIG. 1, an inner roll type electric resistance welded pipe forming machine 10 according to an embodiment of the present invention includes a molding stand 11 provided on an electric resistance welded pipe manufacturing equipment line a, Roll structure 13 mounted on a moving carriage 12 to be taken in and out, and bending and forming an electric resistance welded tube from a thin plate.
And An upper portion of the molding stand 11 is provided with a pressing device 11a including a pair of front and rear screw jacks, and a lower portion of the forming stand 11 is provided with a pressing device 11b including a pair of front and rear screw jacks. A load cell 11c with a flange is attached to the tip of the rod of the screw-down device 11a.
The rod 1 of the hoisting device 11b is
A lifting rod 12a which is raised and lowered by taking in and out 1d to lift or lower the lower roll axle box 26 is arranged (see also FIG. 2).

The movable trolley 12 may be a self-propelled trolley or a trolley pushed and pulled by a traction device. The movable trolley 12 is pulled out from the front of the forming stand 11 along a take-in / out rail 14 extending in the Y direction, gets on the empty rail 17a of the rearrangement trolley 17, and then retracts the rod 16 of the hydraulic cylinder 15 long in the X direction. As a result, the other rail 17b of the rearrangement carriage 17 is connected to the access rail 14, and then the new movable carriage 12 on the other rail 17b moves to the forming stand 11 side, and the new roll assembly 13 is moved to the forming stand 11 Will be incorporated within. FIG. 2 shows the assembled state.

As shown in FIG. 3 and FIG.
Reference numeral 3 denotes an inner stand 18 serving as an exterior case, an upper roll 19 forming a forming roll, and left and right side rolls 2.
0, 21 and lower roll 22 and a pair of upper roll axle boxes 2
3, left and right side roll shaft boxes 24 and 25, and a pair of lower roll shaft boxes 26. As shown in FIGS.
A large-diameter ERW pipe insertion hole 18a is formed in the center of both side plates of the inner stand 18, and left and right side roll shafts are formed on the front and rear sides of the inner stand 18 when the ERW pipe is formed. Pressure-side devices 27 and 28, which are screw jacks having rods 27a and 28a for applying a constant lateral pressure to the boxes 24 and 25, are provided. Flanges 27b and 28b are formed at the tips of the rods 27a and 28a, which are examples of the pressing member. One of the pressure-side devices 28 is configured such that the rod 28a is attached to the outside of the lower roll 22 when the lower roll 22 is replaced. Roll shaft 22 protruding long
The other side of the pressure-side device 27 is disposed outside so as not to contact one end of “a”. The protruding portion is detachably connected in-line to a driving system of the lower roll 22 provided outside.

As shown in FIGS. 2, 4 and 7, on the inner surfaces of both side plates of the inner stand 18, a pair of upper and lower guides 3 of an upper roll axle box 23 extending in the Z direction on both upper sides thereof.
0 is attached, and on both sides of the center of the inner surface,
The sliding guides 31 of the left and right side roll shaft boxes 24 and 25 extending in the Y direction are attached, and the lifting guides 32 extending in the Z direction of the lower roll shaft box 26 on both lower sides of the inner surface.
Is attached. On the other hand, guide grooves 23a and 26a corresponding to the elevating guides 30 and 32 are formed on both side surfaces of the upper and lower roll axle boxes 23 and 26, respectively. In addition,
A pair of flange engaging portions 11e into which the flanges of the load cell 11c are inserted project from the upper surface of the upper roll axle box 23. The distance L1 between the lifting guides 30 is
Left and right side roll axle boxes 24, 25 when replacing side rolls
Is a distance L2 at which the lower roll axle box 26 does not contact when the lower roll is replaced. Therefore, the thickness of each of the guides 30 to 32 is inevitably larger than that of the elevating guide 30.
1. The lifting guide 32 is thicker than the sliding guide 31 (see FIGS. 2 and 7). Next, as shown in FIGS.
Roll support means 34 for allowing the support member 33 to be taken in and out
Will be described in detail.

As shown in FIGS. 8 and 9, a pair of notches 35 are formed on the upper roll side of the slide guide 30 above the inner stand 18, and the notches 35 are horizontally rotated via pins 36. A supporting member 33 is mounted on the shaft. The upper and lower ends of the pin 36 are rotatable via bearings 37. At the center of the outer surface of the notch 35, a backing plate 38 is disposed, which is extended over the upper and lower portions of the formation of the notch 35,
Therefore, from both sides of the notch 35, the thick support portion 33a on one end side of the support member 33 and the input portion 33b on the other end side are externally exposed. A concave portion 39 is formed in the vicinity of the shaft attachment portion at one end of the support member 33, and in the concave portion 39, the urging force of the spring 40 abuts against the back surface of the one end of the backing plate 38 in a biased state. Then, the equilibrium return projection 41 for always equilibrating the support member 33 on both side plates of the inner stand 18 is housed in a removable manner. When the support member 33 is returned to the equilibrium state, the thick support portion 33a
Is protruded into the inner stand 18, and the protrusions integrally formed on both ends of the inner side surface of the upper roll axle box 23 are hung on this protruding portion, so that the upper roll axle box 23 Is supported.

On the other hand, as shown in FIG. 9A, on the upper side of the molding stand 11, an upper roll support release cylinder 43 which is an example of a support operation portion for pressing the input portion 33b of the support member 33 from outside is provided. And a bracket 44, and as shown in FIG. 9B, when a rod 45, which is an example of an input element, is protruded and an input section 33b is pressed, the support member 33 is turned around the pin 36 by an arrow. The support portion 33a is disengaged from below the hook projection 42, and the support state of the upper roll axle box 23 is released. Thereafter, when the rod 45 is retracted, the pushed-in equilibrium return projection 41 projects again due to the urging force of the spring 40, and thereby the pin 36
, The support member 33 rotates to the original support position of the upper roll axle box 23 (see FIG. 9A). Next, FIG.
The horizontal sliding structure of the left and right side roll shaft boxes 24 and 25 will be described in detail with reference to FIGS.

As shown in FIGS. 4 and 6, sliding projections 46 extending in the Y direction are integrally formed at the center of both side surfaces of the left and right side roll axle boxes 24 and 25. The portion 46 is a comb-tooth portion 47 in which a central portion is cut out to form an uneven portion. On the other hand, as shown in FIG. 11, above the slide guide 31 of the inner stand 18 on which the slide protrusion 46 is slidably mounted, the slide protrusion 46 is slidable in the Y direction. A pressing cotter 48 is arranged. Cotter 48
Is horizontally slidably mounted between the press guide 49 provided above the slide guide 31 of the inner stand 18 and the slide guide 31, and when the slide is horizontally slid, A rod 51 is inserted into the through hole 52 of the cotter 48 from outside via a long hole 50 formed in the inner stand 18, and an operator pushes and pulls the rod 51. Further, the cotter 48 has a comb-tooth portion 53 in which a central portion is cut out to form an uneven portion, similarly to the sliding protrusion 46. When the sliding protrusion 46 is moved into and out of the sliding position below the cotter 48, the cotter 48 in the state of FIG. The concave and convex portions of the comb teeth 47 of the portion 46 are aligned so as not to interfere with each other, and in this state, the left and right side roll shaft boxes 24 and 25 are put in and out (see FIG. 11B).

The rods 27a, 28a of the pressure side devices 27, 28 are provided on the outer surfaces of the left and right side roll shaft boxes 24, 25.
A pair of flange retaining portions 54 for retaining the flanges 27b and 28b are mounted. The flange hooking portion 54 on the compression side device 28 side is connected to the lower roll shaft box 2 of the lower roll shaft 22a.
6 is attached via a block-shaped side axle box pressing portion 55 that is slightly longer than the portion protruding outward. In FIG. 3, reference numeral 56 denotes a rattling spacer.

Next, the operation of the inner roll type electric resistance welded tube forming machine 10 according to one embodiment of the present invention will be described. At the time of roll exchange, the upper roll axle box 23 at the forming height position of the ERW pipe shown in FIG. 10C is moved by the pressing-down device 11a of the forming stand 11 to the support member 33 shown in FIG.
9 and then the rod 45 of the upper roll support release cylinder 43 is retracted, and the support member 33 is moved by the urging force of the spring 40 of the balance return projection 41 as shown in FIG.
By rotating in the direction opposite to the arrow shown in FIG. 3B, a part S of the support portion 33a is projected into the inner stand 18. afterwards,
As shown in FIG. 10A, the upper roll axle box 23 is placed on the support portion 33a by slightly lowering the upper roll axle box 23 by the pressing-down device 11a.

Subsequently, the assembled roll structure 13 is pulled out from the inside of the forming stand 11 via the movable carriage 12, and the movable carriage 12 on which the new assembled roll structure 13 is mounted on the rearrangement carriage 17 via the insertion / removal rail 14. The movable carriage 12 is returned to the inside of the molding stand 11 after being exchanged into the molding stand 11 or after replacing the molding roll of the old set roll structure 13 outside. However, in any case, at the predetermined roll exchange stage, the roll exchange of the forming roll incorporated in the pulled-out roll assembly 13 is performed.

As shown in FIGS. 4 to 7, a specific roll exchange operation is performed by, for example, an overhead crane or the like, along with the upper roll axle box 23 supported on the equilibrium return projection 41 and the upper roll 19 along the elevating guide 30. And then the pressure side device 2
The spacers 56 used to kill the backlash inserted between the flanges 27b, 28b of 7 and 28 and the flange engaging portions 54 of the left and right side roll axle boxes 24 and 25 are removed, and the elongated holes 50 of the inner stand 18 are removed. The operator pushes and pulls the rod 51 inserted into the through-hole 52 from the outside, so that the cotter 48 is moved to the left and right side roll shaft box 2.
4 and 25 are slid horizontally, and then the left and right side rolls 2 together with the left and right side roll axle boxes 24 and 25
0 and 21 are pulled out and taken out.

Next, the rod 27 of the compression side device 27, 28
a and 28a are moved to the roll shaft 2 when the lower roll 22 is pulled up.
The lower roll 22 is pulled up to a position where it does not come into contact with 2a, and then the lower roll 22 and the lower roll axle box 26 are pulled up along the lifting guide 32 and taken out. Subsequent assembling of new rolls 19 to 22 to be incorporated into the inner stand 18 and incorporation of the set roll structure 13 into the forming stand 11 include removal of the old rolls 19 to 22 and old set rolls. The operation of removing the structure 13 is performed in the reverse order.

As described above, by providing the inner stand 18 with the upper roll support means 34 for taking the support member 33 of the upper roll axle box 23 in and out, the roll can be replaced at the time of roll replacement.
Since the upper roll support means 34 is operated to project the support member 33 to support the upper roll axle box 23 in the inner stand 18, the lower surface of the upper roll axle box 23 and the left and right side roll axle boxes 24, The upper surface of the roller 25 does not collide with each other and break without the need for a liner that poses a danger to the operator as in the related art. Can be shortened. In particular, since the drive-side liner, which has been a problem due to the presence of the drive spindle, does not need to be attached or detached in the conventional in-line operation, the safety of the worker can be ensured, and time and labor can be greatly improved.

Further, since the support member 33 of the upper roll axle box 23 is moved in and out by the rod 45 of the upper roll support release cylinder 43 to support and release the upper roll axle box 23, the support state is released. Compared with the case where the upper roll support release cylinder 43 is provided on the 18 side, the number of installations of the upper roll support release cylinder 43 can be suppressed to one minimum number, and the equipment cost can be reduced.

Further, when the left and right side rolls 20 and 21 are incorporated into or removed from the inner stand 18, the cotter 48 is horizontally slid so that the uneven portions of the comb teeth 53 of the cotter 48 and the left and right side roll shaft boxes are formed. The sliding projections 46 of the left and right side roll shaft boxes 24 and 25 are aligned with the uneven portions of the comb teeth 47 on the 24 and 25 sides so as not to interfere with each other.
Can pass through the cotter 48, so that the operator does not need to insert and remove the cotter 48 into and from the inner stand 18 as in the related art, thereby improving safety and workability, and improving the right and left side roll shafts. Boxes 24 and 25
Due to the degree of insertion of the cotter 48, rattling is prevented, and a smooth sliding state is always obtained.

Further, left and right side roll shaft boxes 24,
25, the side axle box pressing portion 55 is protruded from the outer surface of the molding stand 11.
Compression side devices 27, 28 when assembling or removing
Only requires the rods 27a, 28a to be relatively small in and out, and the flanges 27b, 2
8b can be moved to the forming position of the electric resistance welded tubes of the left and right side roll shaft boxes 24 and 25 and the shaft box removal position avoiding the roll shaft 22a protruding from the lower roll shaft box 26 on the driving side, thereby improving workability. At the same time, the roll exchange time can be further reduced. It can be moved to the forming position of the electric resistance welded tube of the left and right side roll axle box, and to the removal position of the axle box.

Then, the structure of the inner stand 18 is
The storage width of the lower roll axle box 26 is equal to the left and right side roll axle box 2
Since it was made smaller than the minimum storage width of 4, 25,
When the lower roll axle box 26 is extracted offline,
When assembling the left and right side roll axle boxes 24 and 25 after assembling the lower roll axle box 26, the inner stand 18 does not need to be attached to or detached from the movable carriage 12, thereby reducing the time required for the roll exchange in offline and the time for assembling the roll in online. And work safety can be improved.

Although the present invention has been described with reference to the drawings, the present invention is not limited to this embodiment, and any changes in the design without departing from the scope of the present invention are included in the present invention. For example, in the embodiment, as a forming roll incorporated in the set roll structure, a four-piece forming roll composed of upper and lower rolls and left and right side rolls is employed. However, the present invention is not limited to this. 2
This set of forming rolls may be used.

The upper roll support means provided on the inner stand can support the upper roll axle box offline without being limited to the structure of the embodiment.
Any other structure may be used as long as the support state of the upper roll axle box can be released online. Furthermore, in the embodiment, a detachable rod is inserted into the cotter,
Although the cotter is slid horizontally, the invention is not limited to this. For example, the cotter may be automatically slid by a sliding mechanism having a predetermined drive unit. The cotter is not limited to the slidable one, but may be one that slidably presses the sliding projections of the left and right side roll shaft boxes from above, as described in the section of the prior art. .

Further, in the embodiment, the side axle box pressing portions protrude from the outer surfaces of the left and right side roll axle boxes. However, the present invention is not limited to this. A roll shaft box may be used. Then, in the embodiment, the storage width of the lower roll axle box in the inner stand is made smaller than the minimum storage width of the left and right side roll axle boxes, and when the lower roll axle box is removed from the inner stand, the inner stand is moved from the movable cart. Although attachment / detachment does not have to be performed, it is not necessarily limited to this.

[0038]

The inner roll type electric resistance welded tube forming machine according to the first to fifth aspects is characterized in that the inner stand is provided with upper roll support means for taking in and out the support member of the upper roll axle box, so that the upper roll can be replaced when the roll is replaced. By operating the roll support means to protrude the support member and support the upper roll axle box in the inner stand, the lower surface of the conventional upper roll axle box, the left and right side roll axle boxes or the lower roll axle Even if the upper surface of the box does not perform the work involving the danger of the operator such as the interposition of the liner, there is no danger that the box will collide with each other and be damaged. Can be shortened. In particular, since the drive-side liner, which has been a problem due to the presence of the drive spindle, does not need to be attached or detached in the conventional in-line operation, the safety of the worker can be ensured, and time and labor can be greatly improved.

In particular, in the inner roll type electric resistance welded tube forming machine according to the second aspect, the input member of the supporting operation section on the forming stand side allows the support member of the upper roll supporting means of the inner stand to be taken in and out, and the upper roll axle box is moved. Since the support state is released after supporting or assembling in-line, the number of support operation parts can be reduced to the minimum number compared to the case where the support operation part is provided on the inner stand side, and equipment cost is reduced. Reduction can be achieved.

In the inner roll type electric resistance welded tube forming machine according to the third aspect, when the left and right side rolls are incorporated in or removed from the inner stand, the cotter is slid to form the uneven portion of the comb tooth portion of the cotter. And the uneven portions of the comb teeth on the left and right side roll shaft boxes are aligned so as not to interfere with each other, so that the sliding protrusions of the left and right side roll shaft boxes can pass through the cotter. This eliminates the need for the operator to insert and remove the cotter in the inner stand, thereby improving safety and workability.Also, the left and right side roll axle boxes are always Smooth sliding can be obtained.

Furthermore, in the inner roll type electric resistance welded tube forming machine according to the fourth aspect, since the side shaft box pressing portion protrudes from the outer surface of the side roll shaft box, the assembled roll structure can be assembled in a forming stand. At the time of removal, the pressure side device of the molding stand, by only allowing the pressing member to be relatively small in and out, the pressing position of the pressing member on the left and right side roll shaft boxes,
It can be moved to the axle box removal position avoiding the roll shaft protruding from the drive side of the lower roll axle box, improving workability,
Roll exchange time can be further reduced.

Further, in the inner roll type electric resistance welded tube forming machine according to the fifth aspect, the structure of the inner stand is such that the storage width of the lower roll axle box is smaller than the minimum storage width of the left and right side roll axle boxes. Therefore, when removing the lower roll axle box offline or assembling the left and right side roll axle boxes after assembling the lower roll axle box, it is not necessary to attach or detach the inner stand from the moving cart, and this offline roll change time In addition, the time required for assembling the rolls online can be reduced, and work safety can be improved.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an inner roll type electric resistance welded tube forming machine according to one embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view including a partial cross-sectional view of the roll assembly.

FIG. 4 is an exploded perspective view of the roll assembly.

FIG. 5 is a sectional view showing an assembling structure of an upper roll axle box of the assembled roll structure.

FIG. 6 is a cross-sectional view showing an assembling structure of left and right side roll axle boxes of the assembled roll structure.

FIG. 7 is a cross-sectional view showing an assembling structure of a lower roll axle box of the assembled roll structure.

FIG. 8 is an enlarged perspective view of a main part showing a state in which the upper roll is supported by the upper roll support means.

FIG. 9A is an enlarged sectional view of a main part showing a state in which the upper roll is supported by the upper roll supporting means. (B) It is a principal part expanded sectional view which shows the support release state of the upper roll by the upper roll support means.

FIG. 10A is a schematic front view showing a state in which the upper roll axle box is assembled. (B) It is an outline front view showing the state where the upper roll axle box was pulled up. (C) It is a schematic front view which shows the electric-resistance-welded pipe | tube formation state of an upper roll shaft box.

FIG. 11 (a) is an enlarged perspective view including a partial cross-sectional view showing a slidable state of the left and right side roll axle boxes. (B) It is an enlarged perspective view including a partial sectional view showing a state in which the left and right side roll shaft boxes can be extracted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inner roll type electric resistance welded tube forming machine 11 Forming stand 11a Press-down device 11b Press-up device 11c Load cell 11d Rod 11e Flange hooking part 12 Moving carriage 12a Press-up rod 13 Assembly roll structure 14 Take-in / out rail 15 Hydraulic cylinder 16 Rod 17 Truck 17a Empty rail 17b Other rail 18 Inner stand 18a Insertion hole 19 Upper roll 20 Left side roll 21 Right right side roll 22 Lower roll 22a Roll shaft 23 Upper roll shaft box 23a Guide groove 24 Left side roll shaft box 25 Right side roll Axle box 26 Lower roll axle box 26a Guide groove 27 Compression device 27a Rod 27b Flange 28 Compression device 28a Rod 28b Flange 30 Lift guide 31 Slide guide 32 Lift guide 33 Support member 33a Support portion 3b Input part 34 Upper roll support means 35 Notch 36 Pin 37 Bearing 38 Backing plate 39 Depression 40 Spring 41 Equilibrium return projection 42 Latch projection 43 Upper roll support release cylinder 44 Bracket 45 Rod 46 Sliding projection 47 Comb tooth 48 Cotta 49 Pressing Guide 50 Long Hole 51 Rod 52 Through Hole 53 Comb Tooth 54 Flange Hook 55 Side Shaft Box Press 56 Spacer L1 Distance L2 Distance L3 Distance S Part of Support A

Continuation of the front page (56) References JP-A-5-154565 (JP, A) JP-B 64-10292 (JP, B2) JP-B-6-26736 (JP, B2) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B21C 37/08 B21D 5/12 B21B 31/08

Claims (5)

(57) [Claims] 1. A forming stand provided on a line of an electric resistance welded pipe manufacturing facility, and a set roll structure mounted on a movable carriage taken in and out of the forming stand to curve-form an electric resistance welded pipe from a thin plate. An inner-roll-type electric resistance welded tube forming machine comprising: a plurality of forming rolls including at least upper and lower rolls removably mounted on the movable carriage; and each of these forming rolls has an axis. An inner roll type electric resistance welded tube forming machine, comprising: an inner stand which is assembled via a box; and an upper roll supporting means for allowing a support member of the upper roll axle box to be taken in and out of the inner stand. 2. The apparatus according to claim 1, wherein said upper roll support means has a support operation section attached to said forming stand side to move said support member in and out by operating an input element. Inner roll type ERW pipe forming machine. 3. The forming roll of the set roll structure has left and right side rolls in addition to the upper and lower rolls, and the inner stand is provided above a sliding protrusion of a left and right side roll shaft box. A slidable cotter that is disposed and presses the sliding protrusion is provided, and the cotter and the sliding protrusion are aligned with each other's concave and convex portions so that the left and right side roll shaft boxes are aligned. The inner roll type electric resistance welded tube forming machine according to claim 1 or 2, wherein a comb-tooth portion that can be arranged to pass through to a sliding position below the cotter is formed. 4. A side shaft box pressing portion, which is in contact with a pressing member of a pressure side device attached to a side portion of the forming stand, protrudes from an outer surface of the side roll shaft box. The inner roll type electric resistance welded tube forming machine described in the above. 5. The inner roll type electric resistance welded tube forming machine according to claim 3, wherein a storage width of the lower roll axle box in the inner stand is smaller than a minimum storage width of the left and right side roll axle boxes. .