JP4461549B2 - Roll stand suspension device and roll changing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to TsuSo location and roll replacement method of the roll stand, for example, to hanging device and roll replacement method of the roll stand performing roll replacement of ERW production line.
[0002]
[Prior art]
Hereinafter, a roll stand suspension device in an ERW steel pipe production line will be described as an example. In the ERW steel pipe production line, a belt-shaped skelp is bent into a cylindrical shape and welded while the seam portion is squeezed with a squeeze roll to form and produce an ERW steel pipe with a circular cross section. Usually, in such an ERW steel pipe production line, many types of ERW steel pipes having different product diameters are manufactured, and therefore, roll change is frequently performed to change the size of the forming roll. For example, the squeeze roll includes a bottom roll, a side roll, and a top roll. When changing the roll, the top roll assembly is lifted and the top roll is exchanged offline, and the side roll and the bottom roll are exchanged during that time. . Since the offline roll change of this top roll assembly takes time compared to other roll exchanges of the ERW pipe production line, the top roll assembly of this squeeze roll stand can be used to shorten the roll change time of the entire line. It is necessary to efficiently change the roll.
[0003]
Conventionally, the top roll change of this squeeze roll stand is achieved by attaching four wire ropes to the top of the top roll assembly and smoothly moving the fitting portion where the top roll assembly is fitted to the four stand posts vertically. Then, lift it evenly, then carry it sideways to the offline roll change position, operate the auxiliary hoist attached to the four wire ropes, roll the top roll assembly 90 degrees and place it on the workbench. Rolls were changed by disassembling the side of the assembly housing.
[0004]
During the top roll changing operation, the most time-consuming step is a step of lifting the assembly evenly with four hanging wires, a step of overturning 90 degrees using an auxiliary hoist, and placing the top roll assembly on the work table correctly, And the process of returning the top roll assembly to the original posture and returning it to the line.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a roll stand suspending device and a roll changing method that can rationalize the above-described step of changing the top roll of the squeeze roll stand, advance the work quickly and accurately, and shorten the time. is there.
[0006]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above object, the technical means is a hanging device for the roll stand, the pin placing a Kurenfu click a vertical line upward through the center of gravity of the roll stand is Tsukarada attached to the upper surface of the roll stand comprising a Tsuwaku the portal with a horizontal pin provided to face the lower end of the hanging frame the legs of the gantry, a long hole in which the horizontal pin loosely fitted in the vertical direction And a restraining member that restrains both legs from falling when the horizontal pin is positioned at the lower end of the elongated hole and releases the constraint when the horizontal pin is positioned at the upper end of the elongated hole. This is a roll stand suspension device.
In this case, it is preferable that the roll stand is a top roll assembly of a squeeze roll stand of an ERW steel pipe production line.
The present invention is also a method of changing the roll of the top roll of the squeeze roll stand of the ERW steel pipe production line, wherein a crane hook is provided as a top roll assembly of the squeeze roll stand above a vertical line passing through the center of gravity of the top roll assembly. An upper surface of the roll stand, comprising a portal-shaped suspension frame having a pin to be hung, a horizontal pin provided opposite to the lower ends of both legs of the portal-shaped suspension frame, and a long hole in which the horizontal pin is loosely fitted in the vertical direction And a restraining member that restrains both legs from falling when the horizontal pin is positioned at the lower end of the elongated hole, and releases the constraint when the horizontal pin is positioned at the upper end of the elongated hole; In the ERW steel pipe production line, the top roll assembly having a suspension device provided with A crane hook is hung on the pin and lifted by a crane to the work position with respect to the top roll assembly placed thereon, and the crane hook is lowered by supporting one end of the bottom portion of the top roll assembly, The roll changing method is characterized in that the roll is changed by placing the top roll assembly below the horizontal pin on a work table in a posture in which the top roll assembly is rolled 90 degrees.
Here, the suspended body refers to an object that needs to be lifted straight and rolled over, such as a top roll assembly of a squeeze roll stand of an electric resistance steel pipe production line.
[0007]
In the present invention, a suspension frame that hangs above the vertical line of the center of gravity of the suspension body is attached to the upper end of the suspension body via a horizontal pin. This eliminates the need for adjustment for smooth lifting and suspension while preventing the swinging of the suspended body from tilting with respect to the multiple posts while balancing with the multiple wire ropes. In addition, when the suspension body is rolled over, the suspension body below the horizontal pin of the suspension device of the present invention can be easily overturned using a slope, a stopper, or the like, and 90 ° to a predetermined position by using a conventional auxiliary hoist. The skill, labor, and time-consuming process of placing the roll over are no longer necessary.
[0008]
Further, in the hanging device of the present invention, the horizontal pin is loosely fitted in the long hole of the bracket attached to the hanging body, the horizontal pin is located at the upper end of the long hole when lifting, and the horizontal pin is not lifted. Located at the bottom of the slot. And when a horizontal pin is located in the lower end of a long hole, the restraint member which restrains so that a suspension frame may maintain the attitude | position without falling down is attached to the bracket side. This restraining member does not restrain the suspension frame when the horizontal pin is positioned at the upper end of the long hole, and the suspension frame swings around the horizontal pin. In other words, the suspension frame is always attached to the top of the suspension body, and is designed to be automatically restrained so as not to fall down when not in use. When the suspension body is lowered while supporting one end of the bottom of the suspension body, the suspension frame and the suspension body are rotatable with respect to each other by releasing the horizontal pin, so that the suspension body can be tilted. .
[0009]
Therefore, the apparatus of the present invention can lift and roll over a suspended body such as a top roll assembly smoothly and safely and easily in a short time. As a result, the use of an auxiliary hoist is unnecessary, and the suspension body can be moved up and down and roll over smoothly, quickly, accurately, safely, and, for example, the roll of the top roll assembly can be easily and quickly changed. It was.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings, taking a suspension device for a top roll assembly of a squeeze roll stand as an example. FIG. 9 is a side view showing a state in which the suspension device 30 of the present invention is attached to the top of the top roll assembly 10 of the squeeze roll stand, and FIG. 10 is a front view thereof. The top roll assembly 10 of the squeeze roll stand incorporates a top roll holding portion 20 (20a, 20b) that holds the top roll 21 (21a, 21b). The left half of FIG. 10 shows the holding part holding the top roll 21a corresponding to the steel pipe with the maximum diameter, and the right half of FIG. 10 shows the holding part holding the top roll 21b corresponding to the steel pipe with the minimum diameter. Show. The top roll holding portion 20a or 20b is moved up and down by the electric motor 24, the reduction device 23, and the reduction screw 22, and presses both sides of the seam welded portion of the ERW steel pipe. The top roll holding unit 20 (20a, 20b) is exchanged together with the holding frame 13 when the roll is changed.
[0011]
The suspension device 30 according to the embodiment includes a pin 34 for hanging the crane hook 50 on the center upper portion of the suspension frame 31, and has legs 35 suspended from both ends of the suspension frame 31. A horizontal pin 38 is provided on the leg 35, and is coupled to a bracket 40 attached to the top of the top roll assembly 10 via this pin.
[0012]
1 is a front view of the suspension device 30, FIG. 2 is a side view thereof, and FIG. 3 is a plan view thereof. A suspension bracket 33 is attached to the suspension frame 31 at the center, and a pin 34 is provided on the top of the bracket 33. Suspension plates 32 are attached to both ends of the suspension frame 31, and legs 35 are fixed to the suspension plates 32. The legs 35 are a set of two. As shown in FIG. 4, the leg 35 has a hole 37 for attaching a horizontal pin 38 at the lower end and a hole 36 for coupling to the suspension plate 32 at the upper end.
[0013]
FIG. 5 is a side view of the bracket 40 attached to the top of the top roll assembly 10, and FIG. 6 is an AA arrow view thereof. The bracket 40 is composed of a plate 41 fixed to the top of the top roll assembly 10 together with the reinforcing plate 42, and has a long hole 43 that is long in the vertical direction at the top of the plate 41. Further, as a restraining device for restraining the position of the suspension device 30, projections 44, 45 and 46 are provided, and a backup material 47 is provided.
[0014]
7 and 8 are explanatory views for explaining the action of the long hole 43 of the bracket 40. FIG. As shown in FIG. 7, when the lifting device 30 is lifted, the pin 38 of the leg 35 is located at the upper end of the long hole 43. When the lifting device 30 is not lifted, as shown in FIG. The pin 38 is located at the lower end of the long hole 43. The bracket 40 is provided with protrusions 44, 45 and 46 on the side surfaces. The protrusions 44, 45, and 46 are restraining members that hold the side and bottom surfaces of the legs 35 so that the legs 35 do not fall when the horizontal pins 38 of the legs 35 are positioned at the lower ends of the long holes 43. FIG. 8 illustrates this. As shown in FIG. 7, when the pin 38 of the leg 35 is positioned at the upper end of the long hole 43, the protrusions 44, 45, 46 are arranged so that the leg 35 does not engage with the protrusions 44, 45, 46. The leg 35 is not restrained, and the leg 35 tilts as shown by the arrow 39 and does not hinder the state of 35a. Accordingly, when the suspended body (top roll assembly 10) is transported and lowered to the working position, if the crane hook is lowered while supporting one end of the bottom of the suspended body, the suspended body below the horizontal pin 38 of the suspension device 30 is lowered. Rolls over easily and can be placed on the workbench in a posture in which it rolls over 90 degrees. The backup material 47 prevents the suspension device 30 from falling to the opposite side.
[0015]
【The invention's effect】
Since the suspension device of the present invention is configured as described above, the suspension device is always attached to the upper portion of the suspension body, and is kept in a standing state when it is not lifted. When it is raised, it can be lifted smoothly, and when it is transported to the work place and lowered, the suspended body can be easily turned over and laid on the table. Therefore, for example, the work of changing the top roll of the squeeze roll stand of the ERW steel pipe production line is streamlined, which largely contributes to reduction of labor, improvement of safety, improvement of operation rate of the line, and the like.
[Brief description of the drawings]
FIG. 1 is a front view of a suspension device according to an embodiment.
FIG. 2 is a side view of the suspension device of the embodiment.
FIG. 3 is a plan view of the suspension device of the embodiment.
FIG. 4 is a front view of a leg of the suspension device.
FIG. 5 is a side view of the bracket.
6 is an AA arrow view of FIG. 5;
FIG. 7 is an explanatory diagram of the operation of the embodiment.
FIG. 8 is an explanatory diagram of the operation of the embodiment.
FIG. 9 is a side view of the top roll assembly.
FIG. 10 is a front view of the top roll assembly.
[Explanation of symbols]
10 Top roll assembly 21 (21a, 21b) Top roll 20 (20a, 20b) Top roll holder 30 Lifting device 31 Hanging frame 32 Hanging plate 33 Hanging bracket 34 Pin 35 Leg 36 Hole 37 Hole 38 Horizontal pin 40 Bracket 41 Plate body 42 Reinforcing plate 43 Long holes 44, 45, 46 Protrusions 47 Backup material 50 Crane hook

Claims (3)

A hanging device of the roll stand, and Tsuwaku the portal with a pin to apply a Kurenfu click a vertical line upward through the center of gravity of the roll stand is Tsukarada, the lower end of the hanging frame the legs of該門type a horizontal pin provided oppositely, a bracket attached to the upper surface of the roll stand provided with a long hole horizontal pin loosely fitted in the vertical direction, the legs when said horizontal pin is positioned at the lower end of the long hole constrained so as not falling, the horizontal pin is hanging device of the roll stand, characterized in that when positioned in the upper end of the long hole and a restraining member to release the restraining. 2. The roll stand suspension device according to claim 1, wherein the roll stand is a top roll assembly of a squeeze roll stand of an electric resistance steel pipe production line. A method of changing the roll of the top roll of the squeeze roll stand of the ERW steel pipe production line,
  As the top roll assembly of the squeeze roll stand, facing the lower ends of both legs of the gate-shaped suspension frame having a pin for hanging a crane hook above the vertical line passing through the center of gravity of the top roll assembly, and the gate-shaped suspension frame A horizontal pin provided, a bracket provided with a long hole in which the horizontal pin loosely fits in the vertical direction, and a bracket attached to the upper surface of the roll stand, so that the both legs do not fall when the horizontal pin is positioned at the lower end of the long hole. Using a top roll assembly having a suspension device that includes a restraining device that restrains and releases the restraint when the horizontal pin is positioned at the upper end of the elongated hole,
  With respect to the top roll assembly installed in the ERW steel pipe production line in a state in which the both legs are not tilted by the restraining member, a crane hook is hung on the pin, lifted by a crane, and conveyed to a work position, A roll characterized by supporting one end of a bottom portion of a top roll assembly, lowering the crane hook, and changing the roll by placing the top roll assembly below from the horizontal pin on a workbench in a posture rotated 90 degrees. Replacement method.

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