JPH0634006Y2 - Tapered pipe forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a device for forming a tapered tube such as a reducer.

A taper pipe such as a reducer used as a joint for pipes having different diameters is a device in which an upper roll of an ordinary cylindrical pipe forming device, which is generally a combination of three cylindrical rolls in a pyramid shape, is inclined for forming a tapered pipe. In order to form a taper pipe with such a cylindrical roll, it is necessary to slip the raw steel sheet into the roll while slipping it and to make the peripheral speed of the taper pipe different between the small diameter side and the large diameter side. . Therefore, there is a problem that the thrust load is large and the roll chock and the end of the forming pipe are easily damaged.

Recently, the above problem has been solved by the development of a taper pipe forming apparatus called a taper bending roll in which all three pyramid-shaped rolls are formed in a taper shape, but on the other hand, in this apparatus, all three rolls are tapered. As a result, the size of the taper pipe that can be formed is limited.
Therefore, when forming taper pipes having different taper degrees, it is necessary to install a dedicated device for each size, or prepare several sets of replacement rolls having different taper degrees with one set of three rolls. However, when three rolls are replaced and used, it takes a considerably long time to replace the rolls, which is a problem.

The present invention has been made in view of such an actual situation, and it is not necessary to feed the material steel plate into the roll while slipping the same as in the device using the cylindrical roll. An object of the present invention is to provide a taper pipe forming apparatus that does not require replacement of all three rolls each time different taper pipes are formed.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a taper pipe forming apparatus embodying an example of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a view taken along the line DD of FIG. It is a side view.

As shown in FIGS. 1 to 3, the taper pipe forming apparatus of the present invention has two taper units arranged on a pedestal (18) side by side with a predetermined axial interval (l) narrow on the small diameter side and wide on the large diameter side. lower roll (5) (5) and, the tapered lower roll (5) (5) located directly above between, independent of the front and rear lifting device (13) straight shaft moves up and down by (14) (4 ₂₎ And a multi-upper roll (4) which is rotatably fitted over a large number of small-width cylindrical rolls (4 ₁ ) at regular intervals.

That is, the bearing bases (20 ₁ ) (20 ₂ ) are provided on the upper surface of the pedestal (18) at regular intervals in the front and rear. Each of the front and rear bearing bases (20 ₁ ) (20 ₂ ) is formed by a box body having an internal cavity that is long in the left-right direction of the base (18).

The two left and right tapered lower rolls (5) and (5) are located below the bearings (19 ₁ ) (19 ₂ ) at the ends of the roll shaft (5 ₁ ) in the front and rear bearing bases (20 ₁ ) (20 ₂ ). The bearings (19 ₁ ) (19 ₂ ) are pulled out from the bearing bases (20 ₁ ) (20 ₂ ) to pull out the lower parts of the bearings (19 ₁ ) (19 ₂ ) It can be replaced with the lower roll.

A gear (6 ₂ ) is fitted to each of the _two tapered lower rolls (5) (5) at the shaft end of a roll shaft (5 ₁ ) protruding from the large diameter side of the roll. The gear (6 _2), the base (18) each lower roll to the rear (5) (5) roll axis installed and the rotation of the prime mover (8) via a universal joint shaft (7) for each ( 5 ₁ ), the lower part of the bearing (19 ₁ ) (19 ₂ ) of the taper lower roll (5) is inserted into the bearing base (20 ₁ ) (20 ₂ ) as described above and fixed. universal joint shaft (7) forearm gear (6 ₂₎ meshing.

(17 ₁ ) (17 ₁ ), (17 ₂ ) (17 ₂ ) attached to the front and rear bearing bases (20 ₁ ) (20 ₂ ) in a pair of left and right, use the taper lower rolls (5) (5) This device is a device for adjusting the axial distance (l) when it is replaced with a tapered lower roll having a different inclination, and is a hydraulic ram. These hydraulic rams (17 ₁ )
(17 _1), (17 ₂₎ (17 ₂₎ is bearing stand (20 ₁₎ (20 ₂₎ internally tapered under roll (5) bearing (5) (19 ₁₎ (19 ₂₎
Due to expansion and contraction of the ram rod connected to the lower part,
₁₎ (20 ₂₎ on the tapered bottom roll (5) and (5) a bearing (19
₁₎ (19 ₂₎ each is moved in the lateral direction, to adjust the shaft spacing (l).

Two pole-shaped stoppers (9) and (9) standing on both sides of the taper lower rolls (5) and (5) arranged in parallel on the small diameter side have a role of positioning and thrust receiving at the time of forming the material steel plate (1). The stopper saddle (9 ') is screwed onto the screw shaft (10) parallel to the center line of the pedestal (18) which is driven to rotate by the stopper moving motor (11). The position can be changed according to the change of the diameter of the pipe (2).

The multi-upper roll (4) arranged right above between the taper lower rolls (5) (5) juxtaposed to each other vertically extends back and forth by sandwiching the taper lower rolls (5) (5) on the pedestal (18). A large number of small widths are provided on the lower surface of the beam (3) that is horizontally supported by an up-and-down lifting device, that is, two hydraulic rams (13) and (14), and that is vertically moved by the expansion and contraction of rods of the hydraulic rams (13) and (14). A straight shaft (4 ₂ ) equipped with a cylindrical roll (4 ₁ ) is fixed and attached at both ends. Straight shaft of the multi-on roll (4) (4 ₂₎ is tapered under the roll (5)
It is made of steel bar with almost the same length as the above, and a large number of small-width cylindrical rolls (4 ₁ ) that are rotatably fitted onto it at regular intervals are formed by bearing rolls with a width of about 5 cm. . The front and rear hydraulic rams (13) and (14) supporting the beam (3) have different stroke lengths of the rods, and the hydraulic ram (13) of the front short rod has a beam receiver attached to the tip of the rod. The front end of the beam (3) is supported via the (12). The beam receiver (12) is formed of a prism, and an upper portion thereof is provided with a square hole (12 ') which fits with the front end portion of the beam (3) which is formed in a single step. The lower end of the beam receiver (12) is rotatably attached to the rod tip of the hydraulic ram (13), and the beam receiving (12) is moved by the rod retracting operation of the beam receiving and tilting hydraulic ram (16). The whole is tilted about 90 ° in the direction of the arrow as shown by the chain double-dashed line.

The beam receiving and tilting hydraulic ram (16) has left and right mounting pieces (3) protruding from the upper end of the rod in front of the beam receiving (12).
1) A prismatic guide frame (28) (28) that is slidably attached to the long holes (31 ') long in the top and bottom of the (31) and the cylinder part is erected on the left and right of the hydraulic ram (13). ) On the front side, a mounting member (3) consisting of horizontal members (32) and vertical members (33) (33)
It is attached by mounting the shaft through 4). The left and right guide frames (28) (28) are for guiding the vertical movement of the beam receiver (12) due to the expansion and contraction of the rod of the hydraulic ram (13), and a sliding material is lined on the inner surface side. There is. The hydraulic ram (13) has its cylinder bottom fitted into the pedestal (18) and its cylinder upper part fixed between the guide frames (28) and (28) via a support member (35). 18) Mounted vertically on top.

On the other hand, the hydraulic ram (14) with a long stroke on the rear side is fixed via the support member (36) between the left and right legs of the gate-shaped guide frame (29) whose cylinder upper part straddles the beam (3). The tip of the rod is attached to the beam (3).
The gate-shaped guide frame (29) is for guiding the vertical movement of the beam (3) due to the expansion and contraction of the rod of the hydraulic ram (14), and a sliding member is lined on the inner surface side thereof.
(15) is a beam (3) that abuts the upper surface of the tail end (3 ') of the beam (3) at the stroke end of the hydraulic rams (13) and (14).
The supporting plate for preventing the beam (3) from rising when the beam receiver (12) is tilted and the beam (3) is disengaged.

Further, the front and rear hydraulic rams (13) and (14) can independently perform expansion and contraction operations of rods. Therefore, by changing the expansion and contraction amount of the rods of the front and rear hydraulic rams (13) and (14), the entire beam (3) can be appropriately tilted, which allows the material steel plate (on the taper rolls (5) and (5) ( The pressing force of the multi upper roll (4) against 1) can be changed between the small diameter side and the large diameter side.

Next, the operation of the device of the present invention having the above structure will be described.

First, select a pair of two taper lower rolls (5) (5) having the same inclination as the inclination of the taper pipe to be formed, and arrange these in parallel on the bearing bases (20 ₁ ) (20 ₂ ). To install. Then, the hydraulic ram (17
₁ ) (17 ₁ ), (17 ₂ ) (17 ₂ ) are operated to adjust the axial distance (l) of both taper lower rolls (5) and (5) to a predetermined interval that is narrow on the small diameter side and wide on the large diameter side. To do.

The predetermined axial distance (l) between the taper lower rolls (5) and (5) as used herein means the axial distance by which the material steel plate (1) is finished into a predetermined shape in the forming process in this device, and is used. It depends on the inclination of the taper lower rolls (5) and (5).

Next, the stopper moving motor (11) is operated according to the size of the tapered tube (2) to be molded, and the positions of the stoppers (9) and (9) are adjusted.

Then, the material steel plate (1) cut into a fan shape in advance is placed on the taper lower rolls (5) and (5) by a crane.
Next, the left and right hydraulic rams (13) (14), which are lifting devices, are operated to retract the rod from the fully extended position until the beam (3) contacts the multi steel upper roll (4) with the material steel plate (1). Lower it. When the multi upper roll (4) and the raw steel plate (1) come into contact with each other, the beam (3) is further lowered by an appropriate amount to press the raw steel plate (1) with the multi upper roll (4), and the taper lower roll (5). (5) Push in to the specified position between. At this time, the shrinkage amount of the left and right hydraulic rams (13) and (14) is adjusted so that each small width cylindrical roll (4 ₁ ) of the multi-upper roll (4) pressurizes the material steel plate (1) evenly. Then, the beam (3) is tilted. Then prime mover (8)
When driving the (8) motor (8) (8) of the rotating force universal joint shaft (7) (7), the pinion ₍₆₁₎
The taper lower rolls (5) and (5) are transmitted to the taper lower rolls (5) and (5) through (6 ₁ ), gears (6 ₂ ) and (6 ₂ ).
Starts rotating. Along with this, the material steel plate (1) is sent in a fan shape between the multi-upper roll (4) and the taper lower rolls (5) and (5) to undergo forming processing. By repeating such forming process two to three times by rotating the taper lower rolls (5) and (5) forward and backward, the raw steel plate (1) is formed into a tapered pipe (2) in a private size. go. During this period, the multi-upper roll (4) changes the peripheral speed of the material steel plate (1) which is different between the large diameter side and the small diameter side of the taper lower roll (5) (5),
The individual rolls (4 ₁ ) rotate individually to follow smoothly. When the forming of the taper tube (2) is completed, the lifting hydraulic rams (13) and (14) are activated again to horizontally raise the beam (3) to the fully extended position of the rod. Then, the beam receiving and tilting hydraulic ram (16) is operated to remove the beam receiving member (12) from the front end portion of the beam (3), and the taper pipe (2) whose molding has been completed is carried out from the device by a crane. . When the carry-out is completed, the beam receiving / tilting hydraulic ram (16) is operated again to restore the beam receiving member (12), and the beam receiving member (12) is fitted to the front end portion of the beam (3).

When the taper lower roll (5) (5) is replaced with another taper lower roll having a different inclination by changing the inclination of the taper pipe (2) to be formed, the original taper lower roll (5) (5) is used. Lift it horizontally with a crane and remove it from the bearing blocks (20 ₁ ) (20 ₂ ).

Then, the taper lower rolls (5) (5) for replacement are horizontally lowered by a crane or the like on the bearing stands (20 ₁ ) (20 ₂ ) and installed in parallel to newly adjust the shaft spacing (l). , Adjust the positions of the stoppers (9) (9). This completes the replacement of the taper lower rolls (5) and (5).

In the illustrated example, the structure in which the upper multi-roll (4) is attached to the lower surface of the beam (3) is adopted, but the structure is not limited to this. For example, both ends of the straight shaft (4 ₂ ) of the upper multi-roll (4) are The rear end of the hydraulic ram (14) with a long stroke, and the front end of the rear end of the beam ram (12) at the front of the hydraulic ram (13) with a short stroke. A structure or the like that does not use the beam (3) that is combined and moved up and down is also conceivable.

As described above, the taper pipe forming apparatus of the present invention uses, as the upper roll, a maltill in which a large number of small-width cylindrical rolls are rotatably fitted on the straight shaft at regular intervals.
Since the taper roll is used as the lower roll, the material steel plate can be smoothly fed into the roll without slipping and can be formed into a taper pipe. Since friction during molding is extremely small, the capacity of the driving motor for driving the taper lower roll can be small, and it is suitable for molding thin-walled pipes. Since the multi-upper roll does not need to be replaced and does not require a driving force, the structure of the bearing portion is simple. Also, replacement of only one set of two taper lower rolls is more convenient than replacement of all three sets of taper rolls each time a tube with a different taper degree is formed like a conventional taper bending roll. It is possible to obtain an excellent effect such that the time and labor required for it are significantly reduced, and the number of replacement taper rolls to be prepared is small.

[Brief description of drawings]

FIG. 1 is a plan view of a taper pipe forming apparatus embodying an example of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a view taken along the line DD of FIG. It is a side view. 3: Beam, 4: Manichi upper roll, 4 ₁ : Split roll, 4 ₂ : Straight shaft, 5: Tapered lower roll, 6 ₁ : Pinion gear,
6 ₂ : Gear, 7: Universal joint shaft, 9: Stopper, 12: Beam receiver, 13, 14: Lifting device (hydraulic ram), 17 ₁ ,
17 ₂ : Tapered lower roll axis gap adjusting device (hydraulic ram), 1
9 ₁ , 19 ₂ : Bearing, (20 ₁ ) (20 ₂ ): Bearing base.

Claims (1)

[Scope of utility model registration request] 1. Left and right taper lower rolls (5) (5), which are arranged in parallel on a pedestal (18) with a predetermined axial interval (l) narrow on the small diameter side and wide on the large diameter side, and the taper. A large number of small-width cylindrical rolls (4 ₁ ) are placed on the straight shaft (4 ₂ ) which is located directly above the lower rolls (5) (5) and moves up and down by independent front and rear lifting devices (13) (14). It comprises a multi-upper roll (4) rotatably fitted at regular intervals, the taper lower rolls (5), (5) are replaceable, and the axial distance (l) between the taper lower rolls is an adjusting device. A taper pipe forming apparatus, which is provided so as to be adjustable by (17 ₁ ) and (17 ₂ ) and is rotationally driven through a universal joint shaft (7).